CN211549679U

CN211549679U - Multiphase flow fidelity sampling device based on drilling

Info

Publication number: CN211549679U
Application number: CN201921458343.7U
Authority: CN
Inventors: 魏宁; 李小春; 杨列
Original assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Current assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-09-22
Anticipated expiration: 2029-09-04

Abstract

The utility model discloses a heterogeneous stream fidelity sampling device based on well drilling, ground control system middling pressure source passes through drive tube connection control panel, control pipeline in the U type liquid intaking pipe, sample pipeline upper end and ground control system lower extreme and liquid sampling union coupling, liquid sampling pipe lower extreme passes packer system and porous pipe liquid sampling system connection in the pit, gas control and sampling pipe upper end connect ground control system in the I type gas intaking pipe, the lower extreme passes packer system and is connected with gas filtration sampler, gas filtration sampler and porous pipe liquid sampling system in the pit in the I type gas intaking pipe porous pipe sampling device connect in parallel through automatic multi-way valve each other in the I type gas intaking pipe, liquid temperature sensor among the temperature control system, gas temperature sensor links to each other with the control and the sampling pipe of the sampling pipeline and the I type gas intaking pipe of U type liquid intaking pipe respectively, simple structure, The long-term use cost is low, the durability is excellent, the applicable stratum range is wide, and the method is suitable for oil-water-gas system multiphase fluid fidelity sampling.

Description

Multiphase flow fidelity sampling device based on drilling

Technical Field

The utility model belongs to the technical field of the mixed fluid fidelity sample in the deep ground engineering and resource exploitation such as oil gas, more specifically relate to a device of heterogeneous fluid sample in stratum, it is applicable to the heterogeneous fluid fidelity sample in stratum of an organic whole of heterogeneous sample of underground and earth's surface separation based on perforated pipe sample container and the balance of stewing.

Background

As the development of oil and gas fields enters the middle and later stages, the water content of produced liquid is higher and higher, the exploitation cost of oil wells is higher and higher, and most of the oil and gas fields are high-water-content oil and gas fields; the new technology is adopted for part of oil and gas fields, including gas drive, gas-water alternative displacement exploitation and other technologies, and the underground fluid environment of the oil field becomes more complex along with the exploitation process and the use of various new exploitation technologies. The oil and gas industry pays more and more attention to the sample state and authenticity of an exploration and exploitation oil and gas field, and the acquisition of in-situ fidelity oil and gas sample data is of great importance to the oil and gas field industry and at least comprises the fidelity sampling of multiphase components such as gas-liquid (oil-water) and the like. Therefore, the fidelity sampling of the downhole fluid is a critical purpose for the specific research of the oil physical property, whether environmental protection or the oil field benefit, however, the simultaneous sampling of the multiphase fluid becomes more and more difficult as the oil production development progresses. In addition, geothermal energy and CO₂In-situ fidelity multiphase sampling under complex geological conditions is difficult in geological sealing, underground energy and waste underground storage, deep geological scientific research and other projects, and a technology capable of simultaneously performing fidelity sampling on multiphase fluid is urgently needed, so that the property and the composition of the underground fluid can be accurately known, and the change of the underground fluid state can be accurately researched.

Various countries around the world have made intensive research on downhole fluid sampling techniques, and there are currently a variety of sampling devices: bailer sampler, discontinuous interval sampler, groundwater sampling pump, and exposed filter screen type sampler for directly pushing in-situ groundwater sampling, closed filter screen type sampler, Waterloo sampler, etc. They are characterized by each, but in general, the sampling rate and sample volume cannot be precisely controlled; the U-tube sampling technique (U-tube) for sampling fluids downhole is a sampling system developed by Barry Freifeld in Berkeley laboratories, USA (U.S. patent "Device usefull as a boreholefrid sampler (US9863245B 2)"), and has been applied at the forefront of projects in Frio salt water layer, Australia Otway, Ketzin, Germany, and the like, to achieve the expected effects. The U-shaped pipe underground fluid sampling technology is greatly improved (such as a layered gas-liquid two-phase fluid fidelity sampling device in a well and a layered fluid monitoring and sampling device based on pressure pulse) and a plurality of field experiments are carried out, the experimental results show that the improved U-shaped pipe sampling technology has good effect of carrying out fluid sampling at each determined depth in the well, and the technical scheme is mature and can be applied to sampling of fluids at each depth in the well. However, these sampling techniques based on U-shaped sampling tubes only aim at one determined depth sampling (single-phase liquid phase fluid), but how to perform the fidelity sampling of the multi-phase liquid and gas mixture sample needs further improvement, such as: light oil, water, heavy oil, additive fluid, and the like. In particular, because the multiphase fluid is layered in the bottom layer due to gravity separation, a full-section fidelity sampling technology of the multiphase fluid is required.

The current underground separation sampling technology is to sample through a multiphase flow separation sampler connected with a sampling pump (a submersible electric pump, a screw pump, a mechanical pump, etc.); the working mode of sampler separation is through heterogeneous stream gravity differentiation and centrifugal motion, and the existence of the pump body needs to be regularly overhauled, and the partial pump (such as a submersible electric pump) has shallow use depth, short mechanical life, poor continuous use capability and certain restriction. The underground sampling technology of the oil field mainly uses an old mechanical sampler, a sampling cylinder is always kept in an open state in the sampling process, and the sample cannot be guaranteed to be the sample taken by the sample at the preset layer position; neither the representativeness of the sample of the sampled layer nor the authenticity of the sample can be guaranteed. Although the fixed-depth sampling is a fidelity sampling, the sampling frequency is low and the cost is high because each sampling needs to adopt professional equipment and open a production well or other drilling wellhead. The oil-water separation mode used in the oil field is that separation equipment such as an oil-water separator directly carries out oil-water separation underground by means of gravity settling and centrifugal separation, and water is reinjected underground. Although the device can work in a stratum with a specified depth, the pressure reduction and temperature reduction are obvious in the sample taking process, the content of fluid components is obviously changed compared with that in the original stratum, and the sampling by means of oil-water separation equipment cannot guarantee the fidelity sampling.

At present, the underground oil-water separator mainly comprises two types: the gravity type and hydrocyclone type underground oil-water separator is a device for underground oil-water separation by utilizing the principles of density differentiation and natural sedimentation, has low cost but low separation efficiency, cannot accurately judge an oil-water separation interface, and needs to strictly control the flow rate and the separation amount of fluid in a single sedimentation cup because of the very slow gravity separation process. When the separation amount is increased, a plurality of separation units are needed to work to ensure the effectiveness of oil-water separation, so that the separator has overlarge volume and is difficult to adapt to most of underground environments of oil fields, and the practicability is poor. The underground cyclone separator is a typical representative of a centrifugal separation device, oil-water separation is promoted by utilizing the difference between oil-water density difference and centrifugal force of two fluids in an oil-water mixture in high-speed cyclone motion, the duration of the whole separation process is short, the size of the separator is small, but a high-power motor or multi-stage cyclone is needed to ensure the separation efficiency, the pressure change in the separation process is very large, the requirement on site adaptability is high, and part of oil fields need chemical additives to cause oil layer pollution; in addition, other uncertain influence factors (such as temperature and pressure changes and the like) limit the separation effect of the cyclone, and the cyclone has high use cost, poor continuous capability and poor fidelity. Therefore, the existing underground oil-water separation needs to be improved, the characteristics and natural conditions of underground fluid of each oil field, the components, concentration and distribution range of the fluid and the transmission condition and change trend of the fluid in the underground environment are better researched, and the underground oil-water separation sampling device with moderate size and simple structure is needed.

The invention discloses a layered gas-liquid two-phase fluid fidelity sampling device in a well (CN 102108861A), which provides a technical method based on underground gas-liquid two-phase sampling, and the sampling method can meet the requirement of fidelity sampling, wherein a liquid phase is mixed liquid, but the fidelity sampling of static gravity separation multiphase mixed fluid (only gas-liquid two phases and liquid only can be single-phase liquid or liquid in a mixed state) cannot be realized, the sampling point of the gas-liquid phase in each sampling layer can only be a determined depth, the sampling of samples at different depths in a sampling section cannot be considered, and the information of underground proportions (depth range) of different phases of liquid cannot be considered. Meanwhile, the ground equipment needs to be additionally provided with a ground oil-water separation device, and is not suitable for more complicated underground environment, and the sampling analysis of multiphase samples including gas-water-oil-additive and the like, and gas-liquid and the like is also included. At present, the martian rock and soil of the academy of sciences in gas-liquid two-phase fluid sampling device contain a plurality of patents, but the whole-section fidelity sampling technology of multi-phase fluid exceeding gas-water two-phase still belongs to the blank, so that a device and a method for sampling multi-phase fluid (multi-phase fluid such as gas-water-oil and layering condition) capable of realizing fidelity sampling are needed. How to achieve the sampler with low cost and simple maintenance, how to overcome the site limitation, how to reduce the volume of the separator, how to perform multi-phase separation, how to improve the separation efficiency and how to sample multi-phase fluid, and the fidelity sampling is the problem that needs to be solved by the multi-phase fluid sampler at the present stage.

Disclosure of Invention

The utility model improves the defects of the existing sampling equipment and overcomes the technical difficulties of the methods, and the utility model aims to provide a device for the fidelity sampling of drilling multiphase flow, which can ensure the stability of sample fluid during sampling compared with the original sampling device, ensure the authenticity of the sample, and has simple structure, convenient installation and operation and simple maintenance; the device mainly adopts the U + I type sampling tube as a basic control unit, part of the driving fluid can be repeatedly used in the sampling process, the high-frequency sampling and the cost of long-term monitoring are superior to those of other types of fixed-depth sampling equipment, the application range is wide, and the device is suitable for the fields of multiphase fluid fidelity sampling and environment monitoring of various depths and environments in the fields of various oil gas, geological and hydrology and the like.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the technical conception is as follows: in a multi-layer target sampling stratum set by an packer system in a drilling well, multiphase components such as gas, oil, water and the like can be simultaneously sampled at different depths according to the equal proportion of fluid components, and the proportion and the depth of different fluids can be judged. The sample mode is the fidelity (heat preservation pressurize) sample, and the sample method adopts the utility model discloses a sample mode cooperation ground control system carries out heterogeneous mixed fluid and advances control and constant volume fidelity sample, carries out final heterogeneous separation after fluid reachs ground in the pit. According to the utility model discloses make the sampling device who corresponds, confirm the specification size and the concrete parameter of whole set of device according to the degree of depth, stratum fluid, the single sample volume of target stratum, wash the sampling device pipeline with the clear water before the first sample after going into the well to can begin the sample after filling sampling device with high pressure drive fluid discharge debris. After the inner cavity of the downhole liquid sampling system of the porous pipe is completely filled with the multiphase fluid mixture sample, and the sampling process is finished by standing and balancing (the time is related to the volume of the porous pipe according to the formation environment under the drilling well), the emptying operation is firstly carried out on the U-shaped liquid taking pipe through the ground control system, and then the sampling operation is carried out.

A method of sampling a drilling multiphase mixed fluid, comprising the steps of:

1) before sampling, sequentially opening a fluid pressure reducing valve, a first liquid driving pipe valve, a second liquid driving pipe valve and a first liquid sampling pipe valve, and releasing high-pressure driving fluid in a pressure source to be injected into the U-shaped liquid taking pipe; and (3) putting the high-pressure driving fluid which is not contained in the residual liquid sample collecting part sampled last time in the driving pipe into the liquid sampling container, performing an emptying link (about 15 minutes), and after the residual sample is emptied and the U-shaped liquid taking pipe is filled with the high-pressure driving fluid, closing all other valves in sequence to finish the emptying link.

2) The method comprises the steps of firstly opening a first gas taking pipe valve and a pressure pump, injecting high-pressure driving fluid (not lower than sampling pressure) collected in a pressurized liquid sampling container into a sampling stratum through an I-shaped sampling pipe, then closing the first gas taking pipe valve and the pressure pump, opening a fluid pressure reducing valve and a first gas driving pipe valve, carrying out a stratum pressurization link through the I-shaped sampling pipe, injecting high-pressure driving fluid in a pressure source into the sampling stratum, increasing the stratum pressure during sampling to the highest sampling pressure, slightly increasing the stratum pressure to delta P (controlling the range of | delta P/P | < 10%) higher than the stratum equilibrium pressure P during sampling, and enabling the specific sampling pressure to be related to the original stratum pressure. For example: pressure P of original formation_in-situAbout 17.0MPa, taking | Delta P/P-<5 percent, selecting delta P as 0.5MPa), and closing the fluid pressure reducing valve after the formation pressure is raised,The first gas drives the tube valve.

3) Opening a first liquid sampling pipe valve to close all other valves, controlling and slowly releasing high-pressure driving fluid in a sampling pipeline at the right part of the U-shaped liquid taking pipe into a liquid sampling container, and reducing the pressure in the pipe; and enabling the multiphase fluid of the sampled stratum to enter the U-shaped liquid taking pipe, and starting the sample injection link of the U-shaped liquid taking pipe. When the formation pressure is reduced to the lowest sampling pressure P-delta P (for example, 16.0MPa, the lowest sampling pressure value is lower than the original formation pressure by about 0.5MPa), repeating the formation pressurization link, after the pressurization is carried out to the sampling pressure (the sampling pressure ensures that the pressure of the U-shaped liquid taking pipe is higher than the formation pressure), ending the depressurization at the right part of the U-shaped liquid taking pipe, starting the depressurization on the left part of the U-shaped liquid taking pipe, and collecting the discharged high-pressure driving fluid by using a liquid sampling container again, ending the depressurization of the U-shaped liquid taking pipe control pipeline when the formation pressure (for example, 16.0-17.0MPa in the present case is related to the formation depth) is slightly reduced, repeating the formation pressurization for a plurality of times (3-6 times) (the times is also determined by the stable condition of the formation pressure and the underground equivalent volume of the high-pressure driving fluid in the U-shaped liquid taking pipe), and stabilizing the formation pressure in the formation pressure before the, and maintaining the pressure difference delta P stable to ensure that the sample is not distorted, and alternately reducing the pressure of the left part and the right part of the U-shaped liquid taking pipe until the high-pressure driving fluid in the U-shaped liquid taking pipe is completely emptied, ending the sample introduction link and closing all other valves.

4) Firstly, opening a second liquid driving pipe valve, a second liquid sampling pipe valve and a pressure pump, completely emptying a U-shaped liquid taking pipe, injecting pressurized high-pressure driving fluid into a liquid sampling container, then closing the second liquid sampling pipe valve, the pressure pump, opening a fluid pressure reducing valve, the first liquid driving pipe valve and the first liquid sampling pipe valve, starting a sampling link, injecting the high-pressure driving fluid in a pressure source into a control pipeline of the U-shaped liquid taking pipe, driving multiphase fluid samples (oil, water and the like) in the U-shaped liquid taking pipe to reach the ground, carrying out multiphase separation and multiphase physical property analysis on the ground after the oil and water samples are taken from the ground, sampling the separated samples, wherein the total sampling amount is approximately equal to the inner volume of a porous pipe under the condition of stratum pressure, and because the multiphase flow outside the pore diameter of the side wall of the porous pipe cannot rapidly permeate into the porous pipe in the sampling process to increase the proportion of part, therefore, the sampling and sampling are all-section sampling, the pressure of the driving fluid in the U-shaped liquid taking pipe needs to be accurately controlled by a ground control system in the sampling process, all valves are closed to lock the high-pressure driving fluid in the pipe after the fluid is emptied, and the existence of air leakage in the pipeline is checked.

5) The first gas taking pipe valve is opened, high-pressure phase low-density fluid in the pipe is released to reduce the formation pressure delta P, and a sampled underground gas sample of the formation takes the high-pressure low-density fluid injected into the formation as a carrier and reaches a gas sampling device on the ground through the I-shaped gas taking pipe together.

6) After sampling is finished, high-pressure low-density driving fluid is injected into the U-shaped liquid taking pipe through the ground control system to fill the U-shaped liquid taking pipe, all valves are closed to check whether the sampling device leaks, and the state that the pressure in the U-shaped pipe is not lower than P + delta P is kept until the next sampling period.

Different from the traditional multiphase fluid sampling technology based on fluid self-weight separation at the bottom of a well and the traditional multiphase fluid sampling technology at the bottom of the well, the device and the method for sampling the multiphase fluid fidelity of the underground stratum based on the gravity differentiation principle and the method for separating the multiphase fluid by standing and balancing a porous pipe are provided. Compared with the traditional sampling technology, the utility model discloses the device can realize the whole section sample of heterogeneous fluid, and application scope is wider, work efficiency is higher. The whole device is installed in a drilling well through a conventional connection method (such as connection modes of an oil pipe, a steel wire rope, a workover screw and the like), and is a monitoring technology capable of carrying out long-term fidelity sampling on an underground multiphase fluid environment. If part of the fluid sample entering the porous tube is less, such as oil, the porous tube can be made of a material with surface affinity for a small amount of sample, so that the sample introduction of the small amount of sample is facilitated, and the subsequent analysis is facilitated. After the multiphase mixed fluid is subjected to sample introduction, standing balance and sampling, the fluid proportion can be analyzed so as to predict the distribution condition of underground fluid, including the depths of different fluid interfaces.

According to the difference of the sampling horizon depth, the device or the method uses the packers to seal off a plurality of strata after the packers are connected in series at different horizons, realizes the layered fidelity sampling of a plurality of horizons operating simultaneously, and can also only use a single packer to carry out single stratum fidelity sampling.

The method for sampling the drilling multiphase mixed fluid overcomes the defects of the existing method and other technical difficulties, has simple structure, stable system, economy and practicability, is suitable for the fidelity sampling and analysis of the multiphase fluid, and has good practical value and industrial prospect.

The utility model discloses on the basis of traditional deep well sampling technique, utilize heterogeneous fluid in the pit that the gravity of heterogeneous fluid differentiates and affinity porous material combines together once to get the fidelity sampling method with the earth's surface separation, the sample and the separation technique (if the sample of depthkeeping in the pit, the sampling bucket sample, electric pump sample Bailer sampler, airtight filter screen type sampler, Waterloo sampler, spiral-flow type oil-water separation sampler in the pit, gravity type oil-water separation sampler in the pit) that are different from current market can carry out fidelity sample and analysis once in the pit to gas, oil, heterogeneous mixture such as water.

Through the technical measures, the technical problems and difficulties that the existing drilling sampling device is difficult to perform fidelity sampling and low in multiphase flow separation efficiency are solved, the underground fluid is basically consistent with the original stratum temperature condition in the whole sampling process, and the pressure change is kept within an acceptable range and is not more than the stratum pressure under the condition of certain pressure (for example, 0.1-10% of the stratum pressure) in the sample introduction process. The utility model discloses it has sufficient progress to distinguish superior performance and the original technology in the fidelity sample of current well drilling sampling technique, has reduced the sample to the disturbance of formation pressure, especially hypotonic stratum (the fluctuation of formation pressure all effective control within formation pressure < 1%). The difference from the prior art is that: the sampling speed and pressure of the fluid are more effectively controlled, and the disturbance on the sampled stratum is smaller, particularly the low-permeability stratum. The rapid change of pressure and temperature in the sampling process may cause the phase change of the components of the near-saturated sample, and the components may also change, thereby affecting the fidelity sampling process. Therefore, the multiphase flow fidelity sampling device based on well drilling comprises functional module components such as a ground control system, a U-shaped liquid taking pipe, a packer system, an I-shaped gas taking pipe, a perforated pipe underground liquid sampling system, a temperature control system, an automatic multi-way valve and the like; the ground control system also comprises a pressure source, a fluid pressure reducing valve, a control panel and a booster pump; the U-shaped liquid taking pipe comprises a control pipeline, a sampling pipeline, a liquid one-way valve and a liquid sampling pipe; the liquid sampling pipes also comprise a first layer of liquid sampling pipes, a second layer of liquid sampling pipes and a third layer of liquid sampling pipes (the same numbers are analogized in sequence) which are communicated by the automatic multi-way valve; the packer system comprises a first packer, a second packer, a third packer and a fourth packer (and the like); the I-type gas taking pipe comprises a first layer of gas control and sampling pipe, a first layer of gas filtering sampler, a second layer of gas control and sampling pipe, a second layer of gas filtering sampler, a third layer of gas control and sampling pipe and a third layer of gas filtering sampler (the same numbers are used in the same order). The gas control and sampling tube is connected with the gas filtering sampler up and down; the multi-hole pipe downhole liquid sampling system comprises a first layer of multi-hole pipe sampling device, a second layer of multi-hole pipe sampling device and a third layer of multi-hole pipe sampling device (the same numbers are analogized in sequence); the temperature control system comprises an insulating layer, a distributed temperature control element, a liquid temperature sensor and a gas temperature sensor. The method is characterized in that: the first packer, the second packer, the third packer and the fourth packer in the packer system are connected in parallel with each other. The pressure source and the control panel in the ground control system are connected through a first driving pipe, the control panel is connected with a U-shaped liquid taking pipe and an I-shaped liquid taking pipe through a first liquid sampling pipe, a second liquid driving pipe and a second gas driving pipe respectively, the first liquid sampling pipe and the second liquid driving pipe are connected with the U-shaped liquid taking pipe, and the second gas driving pipe is connected with the I-shaped gas taking pipe. The sampling pipeline and the control pipeline in the U-shaped liquid taking pipe are respectively connected with a ground control system through a first liquid sampling pipe and a second liquid driving pipe, and the lower parts of the sampling pipeline and the control pipeline are connected with a liquid sampling pipe; the liquid sampling pipe is provided with a liquid one-way valve and then is respectively connected with a first layer of liquid sampling pipe, a second layer of liquid sampling pipe and a third layer of liquid sampling pipe through an automatic multi-way valve; the first layer of liquid sample inlet pipe, the second layer of liquid sample inlet pipe and the third layer of liquid sample inlet pipe penetrate through the packer system and are connected with a multi-hole pipe downhole liquid sample inlet system comprising a first layer of multi-hole pipe sample inlet device, a second layer of multi-hole pipe sample inlet device and a third layer of multi-hole pipe sample inlet device; wherein, the first layer of liquid sample inlet pipe passes through the first packer to be connected with the first layer of porous pipe sample introduction device, the second layer of liquid sample inlet pipe passes through the first packer and the second packer to be connected with the second layer of porous pipe sample introduction device, and the third layer of liquid sample inlet pipe passes through the first packer, the second packer and the third packer to be connected with the third layer of porous pipe sample introduction device. The upper end of a gas control and sampling pipe in the I-shaped gas taking pipe is connected with a ground control system, and the lower end of the gas control and sampling pipe is respectively connected with a first layer of gas control and sampling pipe, a second layer of gas control and sampling pipe and a third layer of gas control and sampling pipe through automatic multi-way valves; the first layer of gas control and sampling pipe, the second layer of gas control and sampling pipe and the third layer of gas control and sampling pipe pass through the packer system and are connected with a gas filtration sampler comprising a first layer of gas filtration sampler, a second layer of gas filtration sampler and a third layer of gas filtration sampler; wherein the first layer of gas control and sampling tube passes through the first packer and is connected with the first layer of gas filtration sampler, the second layer of gas control and sampling tube passes through the first packer, the second packer is connected with the second layer of gas filtration sampler, and the third layer of gas control and sampling tube passes through the first packer, the second packer, the third packer is connected with the third layer of gas filtration sampler. In the porous tube downhole liquid sampling system, a first layer porous tube sampling device, a second layer porous tube sampling device, a third layer porous tube sampling device and a first layer gas filtering sampler, a second layer gas filtering sampler and a third layer gas filtering sampler in an I-shaped gas taking tube gas filtering sampler are sequentially arranged in different independent sampling positions of the seating of a first packer, a second packer, a third packer and a fourth packer at different depths, wherein the first layer of porous pipe sample introduction device and the first layer of gas filtering sampler are arranged in the sampling layer positions of the first packer and the second packer, the second layer of porous pipe sample introduction device and the second layer of gas filtering sampler are arranged in the sampling layer positions of the second packer and the third packer, the third layer of porous pipe sampling device and the third layer of gas filtering sampler are arranged in sampling positions set by the third packer and the fourth packer; the heat-insulating layer in the temperature control system wraps a control pipeline, a sampling pipeline, a gas control and sampling pipe, a distributed temperature control element, a liquid temperature sensor and a gas temperature sensor, wherein the distributed temperature control element is connected (tightly attached) with the control pipeline, the sampling pipeline and the gas control and sampling pipe; the automatic multi-way valve is connected with a first layer porous tube sample injection device, a first layer gas filtering sampler, a second layer porous tube sample injection device, a second layer gas filtering sampler, a third layer porous tube sample injection device and a third layer gas filtering sampler in parallel. The porous pipe downhole liquid sampling system comprises a first layer porous pipe sampling device, a second layer porous pipe sampling device and a third layer porous pipe sampling device which are connected in parallel through an automatic multi-way valve, wherein the first layer porous pipe sampling device comprises a first layer upper part adapter and a first layer porous pipe sampling part which are connected from top to bottom, the second layer porous pipe sampling device comprises a second layer upper part adapter and a second layer porous pipe sampling part which are connected from top to bottom, and the third layer porous pipe sampling device comprises a third layer upper part adapter and a third layer porous pipe sampling part which are connected from top to bottom.

The method is characterized in that: the ground control system consists of a pressure source, a fluid pressure reducing valve, a control panel and a booster pump; the pressure source is connected with a first driving pipe provided with a fluid pressure reducing valve and is connected with a control panel, and the sampling end of the control panel is connected with a booster pump; when the analysis influence of the driving fluid of the pressure source on the physical property of the downhole sample is within an acceptable range, the high-pressure low-density inert gas (such as N) can be selected₂Ar, Kr, etc.) with immiscible low density liquids (e.g.: light oil). Pressure reducing valveAccording to the drilling sample depth with sample the maximum output pressure value (0-100MPa) that the pressure source provided is controlled to the requirement, the utility model discloses device drive power uses high-pressure fluid pressure source's advantage is: when the sampled fluid is sampled, the sampled fluid and the driving fluid are directly influenced in the same device and do not mutually change the physical properties; the sampling driving effect is good, and the field adaptability is strong; the device of the utility model has moderate volume, can be applied to various drilling sampling, does not need to use special power supply and power, and can ensure the normal operation of sampling work; the influence of the sampling depth is low the utility model discloses the device is interior high pressure drive fluidic effective working depth is high, easy operation, pressure source cooperation ground control effect drive fluidic pressure is easily controlled. The control panel is used for integrally installing each driving pipeline, sampling pipelines, control valves and pressure gauges for main facilities of a ground control system for controlling the flow rate of underground sampling pressure, the driving pipelines comprise a first driving pipe, a first liquid driving pipe, a second liquid driving pipe, a first gas driving pipe and a second gas driving pipe, the sampling pipelines comprise a first liquid sampling pipe, a second liquid sampling pipe, a third liquid sampling pipe and a first gas sampling pipe, the control valves comprise a first liquid driving pipe valve, a second liquid driving pipe valve, a first gas driving pipe valve, a first liquid sampling pipe valve, a second liquid sampling pipe valve and a first gas sampling pipe valve, and the pressure gauges comprise a pressure source, a liquid driving pressure gauge, a liquid sampling pressure gauge and a gas sampling pressure gauge; one end of the control panel is connected with a sampling pipeline of the U-shaped liquid taking pipe and a gas control and sampling pipe of the I-shaped gas taking pipe through a first liquid sampling pipe, a second liquid driving pipe and a second gas driving pipe respectively, and the other end of the control panel is connected with a pressure pump through a third liquid sampling pipe and a first gas sampling pipe and is connected with a liquid sampling container and a gas sampling container respectively; the pressurizing pump, a liquid sampling container with rated capacity and a gas sampling container connected with the pressurizing pump accurately control the discharge amount, ensure that the sampling amount is approximately equal to the volume of the inner cavity of the porous tube liquid sampling system to realize full-section sampling, and can pressurize, reduce pressure and sample the fluid discharged to the rated container to inject the fluid into a sampling stratum by pulse again so as to repeatedly use the driving fluid; the ground control system can be accurateControlling the flow velocity and pressure of fluid in the U-shaped liquid taking pipe and the I-shaped gas taking pipe and the sample injection volume of a downhole fluid sample in the sampling process; the fluid pressure in the sampling device is slightly higher than the stratum pressure of the sampling layer, so that stable sampling pressure and accurate sampling volume are ensured, and in the sampling process, the ground control system is connected with the U-shaped liquid taking pipe and the I-shaped gas taking pipe to form a complete sampling device system part; the outside parcel heat preservation of sampling device or temperature control system, the ground control system control sampling system fluidic pressure, velocity of flow, temperature control system control sampling system internal temperature. The ground control device and the temperature control system jointly ensure the stability of sampling, ensure that the temperature and pressure conditions of the sample are similar to the original stratum, ensure that the sample cannot cause the change of the properties of the sample due to the change of fluid phase change or the separation/desorption of dissolved substances in the fluid and the like caused by the sudden change of pressure and temperature in the sampling process, and ensure that the sampling is smoothly carried out and the real representativeness of the sampled sample is ensured;

the U-shaped liquid taking pipe comprises a control pipeline, a sampling pipeline, a liquid sampling pipe and a liquid one-way valve; the upper ends of the control pipeline and the sampling pipeline are respectively connected with a second liquid driving pipe and a first liquid sampling pipe in a control panel in the underground surface control system; the lower end of the control pipeline is connected with the sampling pipeline and the liquid sampling pipe through a tee; the liquid sampling pipe is provided with a liquid one-way valve and then is connected with a first layer of liquid sampling pipe, a second layer of liquid sampling pipe and a third layer of liquid sampling pipe through an automatic multi-way valve; the first layer of liquid sample inlet pipe, the second layer of liquid sample inlet pipe and the third layer of liquid sample inlet pipe respectively penetrate through the lower parts of the first packer, the second packer and the third packer, are connected with a multi-hole pipe underground liquid sample inlet system including a first layer of multi-hole pipe sample inlet device, a second layer of multi-hole pipe sample inlet device and a third layer of multi-hole pipe sample inlet device in an underground multi-phase fluid target sampling stratum set by the packer system, and are further communicated with sampled underground fluid; the fluid flowing direction of the liquid one-way valve is only from bottom to top, so that the porous tube underground liquid sample injection system can only carry out one-way sample injection, and the quality of a sample is prevented from being influenced by the flow series between underground liquid layers. Adopt when liquid sample takes a sample the utility model provides a sample method drive enters into the heterogeneous fluid sample of the interior static balance of liquid pipe through porous pipe liquid sampling system in the pit to the lifting gets into in the liquid sampling container to ground. Considering the corrosion of underground fluid and a high-temperature and high-pressure environment, the whole pipeline material of the U-shaped liquid taking pipe is made of corrosion-resistant 316L stainless steel and the like, and the pipeline material can be further changed into Ha-type alloy when the sampling depth of a drilling well is more than 1000 m; the volume of the inner cavity of the U-shaped liquid taking pipe is approximately the same as that of the inner cavity of the multi-hole pipe underground liquid sampling system, so that the multiphase mixed fluid can be completely taken out to the ground after being separated underground during sampling, and the samples are sequentially separated from the ground, so that lyophobic substances can be coated in the U pipeline, the multiphase liquid after standing balance is prevented from being attached to the pipe wall and being mixed again, and the samples are distorted;

the packer system include first packer, second packer, third packer, fourth packer and place appointed degree of depth in the pit as required and seal, the packer system reserves liquid sample inlet pipe and gas control and sampling tube hole site, let the pipeline alternate earlier and seal after the packer during use, its function lies in that the stratum fluid of the appointed degree of depth of packing forms the stratum of relative seal, prevents that the layer from crossing water. The shallow stratum and the middle stratum can adopt a water expansion type packer, a gas expansion type packer and the like; when deep stratum, the hydraulic packer can be selected and standard packers of petroleum and mineral departments can be adopted, the number of the required packers is set according to different requirements of sampling positions, so that multi-phase mixed fluid fidelity sampling can be simultaneously carried out in different underground depth layers, and the fidelity sampling of underground single stratum can also be carried out.

The I-shaped gas taking pipe comprises a gas control and sampling pipe and a gas filtering sampler which are communicated up and down; the gas control and sampling tube comprises a first layer of control and sampling tube, a second layer of control and sampling tube and a third layer of control and sampling tube which are communicated through an automatic multi-way valve; the gas filtering sampler comprises a first layer of gas filtering sampler, a second layer of gas filtering sampler and a third layer of gas filtering sampler; the first layer of control and sampling pipe, the second layer of control and sampling pipe and the third layer of control and sampling pipe respectively penetrate through the lower parts of the first packer, the second packer and the third packer and are connected with a first layer of gas filtering sampler, a second layer of gas filtering sampler and a third layer of gas filtering sampler in an underground multiphase fluid target sampling stratum set by the packer system. The upper end of the gas control and sampling tube is connected with a first gas sampling tube in a control panel of the ground control system, and the first gas sampling tube is connected with a pressure pump and a gas sampling container through the control panel; the gas filtration sampler filters impurities to prevent solid suspended matters or particles from clogging the sampling tube. The gas taking method is that gas samples are taken by directly reducing pressure, if the gas samples are very few, high-pressure low-density driving fluid or carrier gas released by a pressure source is firstly injected into a gas control and sampling pipe to a target sampling stratum through a ground control system, the gas samples in the stratum are increased and diluted, and then the gas samples are taken by directly reducing pressure; in addition, the carrier gas also improves the sampling process of the stratum pressure matching the U-shaped liquid taking pipe. After the liquid sample is sampled, the high-pressure low-density driving fluid injected before the target sampling stratum is released through the ground control system, the pressure in the sampling stratum set by the packer system is reduced, the fluid outside the wall of the drilled well enters the drilled well for supplement, the next sampling is convenient, and the underground gas sample in the target sampling stratum reaches the ground through the I-shaped gas taking pipe by taking the injected high-pressure driving fluid as a carrier.

The multi-hole pipe downhole liquid sampling system comprises a first layer of multi-hole pipe sampling device, a second layer of multi-hole pipe sampling device and a third layer of multi-hole pipe sampling device; the whole body is cylindrical and is divided into an upper adapter and a porous tube sample injection part which are connected together in a nut, a slip, a thread, a welding mode and the like. The sample injection part of the porous tube is made of porous materials, and can have special surface wetting affinity and also can screen the porous tube capable of passing underground fluid; if the proportion of the part of the fluid is smaller, different hydrophobic and hydrophilic materials can be selected according to the use environment and the use purpose to increase the sampling amount of the fluid with small proportion, the bottom of the perforated pipe is provided with an opening, and if more solid impurities exist underground, a high-permeability filter element can be arranged at the opening at the bottom to prevent the pipeline from being blocked. The lyophilic and hydrophobic material can adopt special lyophilic materials such as hydrophobic/oleophilic materials, oleophilic/hydrophobic materials, lyophobic materials and the like; the porous tube sample injection part can adopt metal porous tubes, plastic porous tubes, drain boards, ceramic tubes and the like (long-term sample injection and one-time sampling), and can also adopt metal as a framework to wind materials such as fiber nylon and the like as an alternative method.

When the porous tube is applied to oil-water separation sampling in the field of oil fields, the porous tube selects a hydrophilic/oleophobic material, and the hydrophilic/oleophobic material can obviously improve the sampling speed of a small amount of liquid samples, such as: the oil and water in the drill hole are more and less, and a pipeline made of oleophylic materials can be adopted, so that the sample injection speed of oil components is improved. When sampling, part of oil-water mixed liquid in the underground multiphase mixed liquid in the target sampling sample layer directly flows into the inner cavity of the porous pipe device from the lower end opening of the porous pipe sampling separation device, and pressure difference is caused due to the fact that the oil-water ratio is inconsistent with the oil-water ratio outside the porous pipe, so that oil-water multiphase components in the stratum can gradually enter or be discharged through the porous pipe, and the fluid ratio in the porous pipe is gradually consistent with the fluid ratio in the drilling well along with time to achieve standing balance. Meanwhile, the multiphase fluid is separated from the multiphase liquid in the porous pipe due to gravity difference.

Because a pressure difference exists between the porous pipe sample introduction device and the U-shaped liquid taking pipe filled with the high-pressure low-density driving fluid, the liquid level of the inner cavity of the porous pipe does not contact with the top adapter when the underground multiphase fluid is subjected to sample introduction, and a cavity with a certain volume is formed at the upper part of the inner cavity of the porous pipe. When sampling, the speed of the oil in the underground multiphase fluid permeating into the porous pipe sampling device through the side wall is faster than that of the oil directly entering from the lower part and standing and separating at the top of the liquid level, so that the time for the aggregation amount of the oil at the upper part in the porous pipe sampling device to reach the peak value is shorter, and the oil-water separation speed is improved. The pressure difference between the U-shaped liquid taking pipe and the sampling stratum in the whole sampling process needs to be maintained stably through a ground control system, so that the samples are not distorted due to sudden change of pressure before sampling and in the sampling process, and the smooth completion of sampling is also guaranteed; the whole sampling process is sampling once for a long time, and the sampling period is determined according to the sampling volume of the multiphase fluid and the sampling scheme formulated by the underground environment of the sampling well.

The affinity and hydrophobicity of the pipe wall of the porous pipe are improved; the wettability of the solid surface is one of important factors for analyzing the oil-water separation performance, and for a fluid with a small sample amount, the affinity and the hydrophobicity of the pipe wall of the porous pipe can be improved. For example: under the environment of more oil and less water, the perforated pipe can be modified by adopting a hydrophobic material, so that the oil sample injection amount is increased, and the water sample injection amount is reduced.

The sample volume is set, the sampling speed v is assumed to be small, the chemical differentiation of multiphase fluid cannot be caused, the flow of the multiphase mixed fluid in pores and sample holes in the pipe wall of the sampling pipe is laminar flow, and the Darcy law is satisfied: KJ ═ v

J＝(P₁-P₂) /(. rho.g.D) (in units of kPa/m or MPa/m) (1)

ΔP＝P₁-P₂(kPa or MPa) so that v ═ K · Δ/(ρ · g · D) (2)

ΔP＝v·ρ·g·D/K (3)

Wherein Δ P is the fluid pressure differential; v is the equivalent flow rate of the multiphase fluid in the sampling tube, i.e. the sampling rate; k is the equivalent permeability coefficient of the porous pipe wall, and is related to the hole wall structure and the pipe wall material; j is the hydraulic gradient; ρ is the fluid density; g is the fluid gravitational acceleration; d is the percolation path, i.e. the wall thickness; p₁、P₂Respectively, the pressure difference between the inside and the outside of the porous sampling tube.

It can be seen that the fluid pressure difference Δ P inside and outside the porous pipe is related to the sampling rate v and the permeability coefficient K, and the fluid pressure difference Δ P is proportional to the sampling rate and inversely proportional to the permeability coefficient K. The pore diameter range of the porous tube is moderate (1 um-10 mm grade) so as to ensure that the sampling mode is full-section sampling, and the specific material selection of the porous material and the affinity condition of the pore diameter, the permeability and the surface are determined according to the actual use condition. A temperature control system: the temperature control part comprises a liquid temperature sensor, a gas temperature sensor, a distributed temperature control element (such as a distributed resistance wire and a heating pipeline), a heat insulation layer, an external temperature control part and a power supply, wherein the temperature sensor is a point type temperature sensor or a distributed type sensor; the temperature in the pipeline of the sampling system is ensured to be consistent with the temperature of the original sampling stratum through the temperature control system, or the temperature in the sampling system is kept to be the preset temperature. The temperature control system keeps the stability of the temperature conditions of the fluid in the U-shaped liquid taking pipe and the I-shaped gas taking pipe, and provides a stable sampling environment for the sampling system together with the ground control system, so that the sampling method is guaranteed to be sampling in fidelity.

Automatically controlling the multi-way valve: the multi-way valve which automatically controls the multi-way valve to be controlled by a circuit is a standard industrial product, for example: the valves of the automatic six-way valve, the automatic eight-way valve and the like are mainly used for controlling different liquid sample inlet pipes (such as a liquid sample inlet pipe, a first layer of liquid sample inlet pipe and a second layer of liquid sample inlet pipe) to be butted with different gas control and sampling pipelines (such as a gas control sample preparation pipe, a first layer of gas control and sampling pipe, a second layer of gas control and sampling pipe and a third layer of gas control and sampling pipe). The control cable for automatically controlling the multi-way valve adopts a cable for petroleum and natural gas industry, and the multi-way valve, the liquid sampling pipe, the gas control and sampling pipe are automatically controlled to jointly control the layer position and the gas liquid type of a sample entering the sampling system; meanwhile, the number of pipelines above the sampling device is reduced.

External protection: if a protection device is needed, an armor layer can be arranged outside the whole device to protect the internal elements and the heat insulation layer. The armor can be made of common metal pipes, plastics, rubber, multi-layer protection, plastic composite layers embedded with steel wire meshes and the like. The multiphase mixed fluid sampling method is characterized in that after the samples separated in the underground reach the ground, the corresponding samples are selected in sequence for sampling operation.

The multi-phase mixed fluid which is difficult to distinguish in multiple sets of strata of the deep well is effectively subjected to equal proportion fidelity sampling through the U-shaped liquid taking pipe, and the sampling device is also suitable for a single stratum sampling system. Fidelity sampling of gas samples in multiple sets of formations is realized through the I-shaped gas taking pipe. The conditions such as temperature, pressure and the like in the pipeline of the sampling device are effectively controlled through the ground control system and the temperature control system, so that the pressure of the sample in the sampling process and after the sampling is finished is higher than the formation pressure, the temperature is generally consistent with the formation temperature, and the fidelity of the sampled product is ensured. After the multiphase fluid sample is kept stand and balanced in the underground porous pipe, the multiphase fluid sample can be separated on the ground according to the sampling sequence without other extra ground separation facilities. The device can be repeatedly used in the process of sampling part of the driving fluid, has high-frequency sampling and cost superior to other types of fixed-depth sampling equipment for long-term monitoring, has wide application range, and is suitable for the fields of multi-phase fluid fidelity sampling and environment monitoring of various depths and environments in various fields of oil gas, geological, hydrology and the like.

Through the technical measures of the functional modules connected with the ground control system, the U-shaped liquid taking pipe, the packer system, the I-shaped gas taking pipe, the perforated pipe underground liquid sampling system, the temperature control system, the automatic multi-way valve and the like, particularly the connection of the ground control system and the temperature control system, the stability of the temperature and pressure conditions in a pipeline in the sampling process of the sampling device is effectively controlled, the temperature is basically unchanged in the whole sampling process, the pressure change does not exceed delta P (for example: 1MPa) in the sampling process, the technical effect of the fidelity sampling is achieved, and the technical problem of difficulty in the fidelity sampling of deep strata is solved. Compared with the prior art, the utility model, have following advantage and effect:

the utility model discloses on the basis of traditional deep well sampling technique, utilize heterogeneous whole section heterogeneous fluid in the pit that the heterogeneous porous material of gravity differentiation in the pit that porous pipe was intraductal to combine together with affinity porous material to get once only with the fidelity sampling method of earth's surface separation, the sample and the separation technique (like the sample of depthkeeping in the pit, the sampling of sampling bucket, electric pump sample Bailer sampler, airtight filter screen type sampler, Waterloo sampler, spiral-flow type oil-water separation sampler in the pit, gravity type oil-water separation sampler in the pit) that are different from current market can carry out fidelity sample and analysis to gas in the certain depth range in the pit, oil, heterogeneous mixture such as water. Has the following advantages and effects:

1. multiphase sampling: the underground multiphase standing gravity separation can be realized in single wells at different depths, and synchronous sampling of multiphase systems such as water-oil-gas in a sampling section is included;

2. sampling in a whole section: all fluid samples in the sampling section (the depth range of the porous pipe) are obtained, and the traditional method that a single sample is obtained at a specific sampling depth is avoided;

3. the small perturbation samples are representative and strong: the sampling technology is based on the principle of a U-shaped sampling tube, can realize small disturbance of sampling pressure in design, can control the pressure overpressure condition in the whole sampling process, and can realize small disturbance sampling on stratum multiphase fluid, thereby ensuring the real representativeness of the sample and improving the sampling amount of the guaranteed liquid; the packer system is sealed between layers, so that the real-time performance of underground fluid mixed sampling and the representativeness of fixed-depth sampling can be ensured;

4. simple structure convenient operation: the structure is simple, no special requirements are required for the working environment, no special power supply is needed, the installation and the operation are convenient, and the maintenance is simple; the partial driving fluid can be repeatedly used in the sampling process, and the high-frequency sampling and cost of long-term monitoring are superior to other types of fixed-depth sampling equipment;

5. the application range is wide: the device is suitable for the fields of multiphase fluid fidelity sampling and environment monitoring of various depths and environments in the fields of various oil and gas, geological and hydrology and the like, and can realize high-frequency and long-term fidelity sampling in demonstration and monitoring fields.

a) The field of underground energy resource exploitation (such as: mining by ore bed ground leaching method and increasing coal bed methane CO by carbon dioxide displacement₂ECBM, enhanced crude CO₂EOR, saline water CO production enhancement₂-EWR, upgrading shale gas CO₂-systematic monitoring and assessment of ESG, science and engineering of subsurface fluids, solute transport and resource mineralization mechanisms and evolution);

b) the field of groundwater dynamic monitoring (groundwater pollution assessment, pollution source tracking, microbial community analysis, polluted land circulation assessment and the like in engineering areas such as dams, factories, oil extraction areas and the like);

c) the long-term monitoring and maintenance of regional projects such as underground reservoirs, geological survey and the like or quality monitoring stations have good application prospect and commercial value.

Drawings

Fig. 1 is a schematic structural diagram of a drilling-based multiphase flow fidelity sampling device.

Fig. 2 is a schematic structural diagram of a surface control system of a drilling-based multiphase flow fidelity sampling device.

Fig. 3 is a schematic structural diagram of a temperature control system of a drilling-based multiphase flow fidelity sampling device.

Fig. 4 is a schematic diagram of a sampling system of a drilling-based multi-phase flow fidelity sampling device.

Fig. 5 is a multi-hole tube sampling device of a multi-phase flow fidelity sampling device based on drilling.

Fig. 6 is a schematic structural diagram of a gas sampling system and a multi-hole tube downhole liquid sampling system of a multi-phase flow fidelity sampling device based on drilling.

Fig. 7 is a schematic diagram of a packer system of a drilling-based multi-phase flow fidelity sampling device.

FIG. 8 is a schematic representation of downhole pressure sampled using an original wellbore sampling technique as a function of sample time.

Fig. 9 and 10 are schematic diagrams of downhole pressure sampling with the device technology of the invention along with sampling time.

Wherein:

1: a ground control system; (including the following components)

10: a pressure source; (N)₂Relatively chemically inert high pressure gas or low density liquid such as Ar, Kr, etc.)

11: a first drive tube; 1101: a first liquid drive tube; 1102: a second liquid drive tube; 1103: a first gas drive tube; 1104: a second gas drive tube; 1111: a first liquid sampling tube; 1112: a second liquid sampling tube; 1113: a third liquid sampling tube; 1114: a first gas sampling tube;

12: a fluid pressure reducing valve; 1201: a first liquid drive tube valve; 1202: a second liquid drive tube valve; 1203: a first gas drive tube valve; 1211: a first liquid sampling tube valve; 1212: a second liquid sampling tube valve; 1214: a first gas intake valve;

13: a control panel; (Integrated pressure control and sampling pipe, valve, pressure gauge)

14: a pressure pump: 1401: a gas sampling vessel; (gas sampling bag, gas sampling bottle, etc.) 1402: liquid sampling container (plastic sampling bottle or metal sampling bottle, etc.) P₀: a pressure source pressure gauge; (standard pressure gauge); p₁: a liquid-driven pressure gauge; (standard pressure gauge); p₂: a liquid sampling pressure gauge; (standard pressure gauge); p₃: a gas sampling pressure gauge; (standard pressure gauge);

2: u-shaped liquid taking tube (comprising the following parts): 21: a control pipeline; 22: a sampling pipeline; 23: a liquid sampling tube; 231: a first layer of liquid sample inlet pipe; 232: a second layer of liquid sample inlet tubes; 233: a third layer of liquid sample inlet pipe; 20: liquid check valves (corrosion resistant spring metal check valves).

3: a packer system; (gas inflatable or hydraulic packer): 31: a first packer; 32: a second packer; 33: a third packer; 34: a fourth packer;

4: type I gas extraction tube: 41: a gas control and sampling tube; 411: a first layer of gas control and sampling tubes; 412: a second layer of gas control and sampling tubes; 413: a third layer of gas control and sampling tube; 42: a gas filtration sampler; (filtering the non-gaseous fluid); 421 a first layer gas filtering sampler; 422 second layer gas filtering sampler; 423 third layer gas filtering sampler;

5: a perforated pipe downhole liquid sampling system; 510 an upper adapter; 520, a porous pipe sample injection part; 51: a first layer of porous pipe sample injection device; 511: a first layer upper adapter; 512: a first layer of porous pipe sample injection part; 52: a second layer of porous pipe sample injection device; 521: a second layer upper adapter; 522: a second layer of porous pipe sample injection part; 53: a third layer of porous tube sample injection device; 531: a third layer upper adapter; 532: a third layer of porous pipe sample injection part;

6: a temperature control system: 61: a heat-insulating layer; 62: a distributed temperature control element; 63: a liquid temperature sensor; 64: a gas temperature sensor.

7: automatic multi-way valve.

The above component materials can be purchased from the market.

Detailed Description

Example 1:

china Union coal Changzi county CO₂Taking a displacement coal bed gas site as an example (underground liquid oil-free water mixture, and a taken gas sample is not collected for relevant experiments), after all devices are checked, the method enters an evacuation depressurization sampling flow, and the method for sampling the multiphase mixed fluid in the stratum comprises the following steps:

firstly, opening a pressure source 10 to release high-pressure relatively inert gas, adjusting a fluid pressure reducing valve 12 to the maximum output pressure (generally, the pressure is about 12Mpa and is related to the drilling depth), and opening a first liquid driving pipe valve 1201, a second liquid driving pipe valve 1202 and a first liquid sampling pipe valve 1211 to inject the high-pressure relatively inert gas into a U-shaped liquid taking pipe 2; high-pressure relatively inert gas leaves the pressure source 10 and passes through the first driving pipe 11, the first liquid driving pipe 1101 and the second liquid driving pipe 1102 to be injected into the underground control pipeline 21 and the sampling pipeline 22 of the U-shaped liquid taking pipe 2, residual liquid samples in the U-shaped liquid taking pipe 2 are emptied to the ground through the sampling pipeline 22, the first liquid sampling pipe 1111 and the third liquid sampling pipe 1113 under the driving of the high-pressure relatively inert gas, part of the high-pressure relatively inert gas without residual liquid is collected into the liquid sampling container 1402 to be used in the next step, and all valves can be closed to finish emptying after no liquid samples such as water mist and water drops are discharged from the third liquid sampling pipe 1113.

Secondly, adjusting a fluid pressure reducing valve 12 to control the output pressure (generally about 7.5 MPa) of a pressure source 10, determining according to the sampled formation pressure, wherein the output pressure of the pressure reducing valve is slightly higher than the formation pressure by 1MPa, firstly opening a booster pump 14 and a first gas taking pipe valve 1214, pressurizing the high-pressure relatively inert gas collected in a liquid sampling container 1402 to the output pressure of the pressure source 10, injecting the high-pressure relatively inert gas into the target sampled formation set by the packer system 3 in a pulse mode through a first gas sampling pipe 1114 and a second gas driving pipe 1104 and a gas control and sampling pipe 41, then the pressurizing pump 14 and the first gas taking pipe valve 1214 are closed, the first gas driving pipe valve 1203 is opened, and the high-pressure relatively inert gas in the pressure source 10 is injected into the target sampling stratum set by the packer system 3 through the first driving pipe 11, the first gas driving pipe 1103, the second gas driving pipe 1104 and the gas control and sampling pipe 41 to increase the stratum pressure (the ascending value is related to the injected gas pressure); pressure gauge P for observing pressure source₀Gas sampling pressure gauge P₃And determining the reading as a stable value (the stable value is about 0.5MPa less than the output pressure of the pressure reducing valve, and the pressure gauge is matched with a matched NI system to realize the purpose), observing and recording about 6.5MPa of the original pressure of the sampled formation and the real-time pressure 6.0-7.0MPa, and the fluid pressure reducing valve 12 and the first gas driving pipe valve 1203 can be closed after the real-time pressure and the pressure rise to 7.0MPa are approximate values.

Thirdly, opening a valve 1211 of the first liquid sampling pipe to close all other valves, and controlling to release high-pressure relatively inert gas in a sampling pipeline 22 at the right part of the U-shaped liquid taking pipe 2, so that the multiphase fluid sample after standing and balancing slowly enters the U-shaped liquid taking pipe 2; the high-pressure relatively inert gas is discharged into a liquid sampling container 1402 in the surface control system 1 through a sampling pipeline 22, a first liquid sampling pipe 1111 and a third liquid sampling pipe 1113, and is re-injected into the sampled stratum through a pressurizing pump 14 when the stratum is pressurized. High pressure injected into a sample taking layer set by the packer system 3 in the early stage can improve the pressure of the sampled stratum relative to inert gas, and accelerate the sample introduction process of the perforated pipe downhole liquid sample introduction system 5; observing formation pressure (6.0-7.0Mpa) (combining NI system and downhole pressure sensor), closing first liquid sampling tube valve 1211 after the pressure is reduced to the original formation pressure value, and keeping track of liquid sampling pressure gauge P₂Pressure data.

Fourthly, repeating the second step for 1 time, opening a second liquid driving pipe valve 1202 and a second liquid sampling pipe valve 1212 to close all other valves after pressurizing the stratum, and controlling and releasing high-pressure relatively inert gas in a control pipeline 21 at the left part of the U-shaped liquid taking pipe 2 so that the multiphase liquid sample enters the U-shaped liquid taking pipe 2; high-pressure relatively inert gas is discharged into the liquid sampling container 1402 through the control pipeline 21, the second liquid driving pipe 1102, the second liquid sampling pipe 1112 and the third liquid sampling pipe 1113 to be collected, and is injected into a sampling stratum for repeated use through the booster pump 14 when the stratum is pressurized; the pressure of the left control pipeline 21 of the U-shaped liquid taking pipe is reduced by the operation. Simultaneously observing the formation pressure, closing the second liquid driving pipe valve 1202 and the second liquid sampling pipe valve 1212 when the formation pressure is reduced to the original pressure value, and keeping track of the liquid driving pressure gauge P₁Pressure data.

Fifthly, repeating the first step, the second step and the third step for two times (six times in total), completely emptying the U-shaped sampling high-pressure inert gas (the times are related to the total volume of the cavity of the U-shaped liquid taking pipe), and observing the liquid driving pressure gauge P₁Liquid sampling pressureDynamometer P₂Until the pressure data is 0 and no gas is discharged from the third liquid sampling tube 1113, which means that the high pressure inside the U-shaped liquid taking tube is emptied relative to the inert gas; and the pressure reduction of the U-shaped liquid taking pipe 2 is finished. In the pressure reduction process of the U-shaped liquid taking pipe 2, a sample after the underground multiphase fluid mixture is subjected to standing balance in the porous pipe underground liquid sampling system 5 continuously permeates into the U-shaped liquid taking pipe 2 through the liquid sampling pipe 23; after the step of reducing the pressure and sampling the sample by the U-shaped liquid taking pipe 2 is completed, the multiphase fluid sampling work after the next step of separation can be carried out.

Sixthly, opening a second liquid sampling pipe valve 1212, a second liquid driving pipe valve 1202 and a booster pump 14, firstly pressurizing and injecting high-pressure relatively inert gas collected in an emptying liquid sampling container 1402 into the U-shaped liquid taking pipe in a pulse mode, closing the second liquid sampling pipe valve 1212 and the booster pump 14 after emptying, opening a fluid pressure reducing valve 12, a first liquid driving pipe valve 1201 and a first liquid sampling pipe valve 1211, and injecting high-pressure relatively inert gas into the pressure source 10; adjusting the output pressure of the fluid pressure reducing valve 12 to be 12MPa at the maximum value, and injecting high-pressure driving gas into the U-shaped liquid taking pipe 2 to lift the multiphase fluid sample injected into the U-shaped liquid taking pipe 2 to the ground; high-pressure relatively inert gas enters the U-shaped liquid taking pipe 2 through the first driving pipe 11, the first liquid driving pipe 1101 and the second liquid driving pipe 1102 in the control panel 13; high-pressure relative inert gas starts to displace multiphase fluid samples which penetrate into the U-shaped liquid taking pipe 2 and are statically balanced through the perforated pipe downhole liquid sampling system 5 through the control pipeline 21 at the left part of the U-shaped liquid taking pipe; the sample reaches the ground through the sampling pipeline 22, the first liquid sampling pipe 1111 and the third liquid sampling pipe 1113, and enters the liquid sampling container 1402 through the third liquid sampling pipe 1113; completely separating the multiphase fluid samples on the ground according to the sampling sequence of oil-water-gas (a small part of underground gas reaches the ground along with the liquid samples); after the sampling step is finished, the U-shaped liquid taking pipe 2 can be pressurized and filled with high pressure, the pressure in the U-shaped liquid taking pipe 2 is increased relative to inert gas, and the pressure difference between the U-shaped liquid taking pipe 2 and the porous pipe downhole liquid sampling system 5 is recovered.

Seventh, the third liquid sampling tube 1113 is closed the first liquid sampling tube valve 1211 when no liquid sample appears, and continues to flow into the U-shaped liquid taking tube 2Injecting high-pressure relatively inert gas to drive pressure gauge P₁Liquid sampling pressure gauge P₂When the pressure data is the same as the pressure source, it indicates that the left and right control pipelines 21 and the sampling pipeline 22 in the U-shaped liquid taking tube 2 are completely filled with the high-pressure relatively inert gas, and at this time, the pressure source 10 fluid pressure reducing valve 12 and all other valves are closed, and whether there is a gas leakage is checked.

Eighthly, after the pressurization in the U-shaped liquid taking pipe 2 is finished, opening a first gas taking pipe valve 1214 to evacuate and release high-pressure relatively inert gas injected into target sample taking layers with different depths set by the packer system 3, reducing the formation pressure in the target sample taking layers and starting gas sampling work; the gas sample in the target sampling stratum takes high-pressure relatively inert gas injected by the I-shaped gas taking pipe as a carrier, reaches the ground through the gas control and sampling pipe 41, the second gas driving pipe 1104 and the first gas sampling pipe 1114 during pressure reduction, and a gas sampling pressure gauge P is used for ensuring safe observation₃Data is carried out on the formation pressure, and a gas sampling container 1401 is used for collecting a gas sample after the formation pressure is reduced to a safe value; and after the gas sample is collected, the surface sampling step is completed, all the valves are closed to wait for the multi-hole pipe downhole liquid sampling system 5 to continuously stand and balance the downhole multiphase fluid mixture, and the sampling operation is carried out after the sampling in the next period.

Through the specific technical measures, the disturbance to the sampling stratum is reduced, the fidelity sample of the deep stratum of the drilling well is obtained, and the same sampling effect is ensured in the next sampling.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Example 2:

the present invention is further described with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, and fig. 7: a multi-phase flow fidelity sampling device based on well drilling comprises a ground control system 1, a U-shaped liquid taking pipe 2, a packer system 3, an I-shaped gas taking pipe 4, a perforated pipe downhole liquid sampling system 5, a temperature control system 6 and an automatic multi-way valve 7. The utility model discloses it is different with current U type pipe gas-liquid double-phase sampling device, increased ground control system 1 and perforated pipe liquid sampling system 5 in the pit, its characterized in that: a pressure source 10 in the ground control system 1 is connected with a first driving pipe 11 and a fluid pressure reducing valve 12; a control pipeline 21 in the U-shaped liquid taking pipe 2 is respectively connected with a sampling pipeline 22, the ground control system 1 and a liquid sampling pipe 23, the liquid sampling pipe 23 is provided with a liquid one-way valve 20, then is communicated with an automatic multi-way valve 7, and then passes through a first packer 31, a second packer 32 and a third packer 33 in a packer system 3 to be connected with a perforated pipe downhole liquid sampling system 5; the first packer 31, the second packer 32, the third packer 33 and the fourth packer 34 in the packer system 3 are connected in parallel, the upper end of a gas control and sampling pipe 41 in the I-shaped gas taking pipe 4 is connected with the ground control system 1, and the lower end of the gas control and sampling pipe passes through the first packer 31, the second packer 32 and the third packer 33 in the packer system 3 and is connected with a gas filtering sampler 42 in the I-shaped gas taking pipe 4. The multi-hole tube downhole liquid sampling system 5 and the gas filtering sampler 42 are connected in parallel through an automatic multi-way valve 7, the multi-hole tube downhole liquid sampling system 5 comprises a first layer of multi-hole tube sampling device 51, a second layer of multi-hole tube sampling device 52 and a third layer of multi-hole tube sampling device 53 which are connected in parallel through the automatic multi-way valve 7, the gas filtering sampler 42 comprises a first layer of gas filtering sampler 421, a second layer of gas filtering sampler 422 and a third layer of gas filtering sampler 423 which are connected in parallel through the automatic multi-way valve 7, the multi-hole tube downhole liquid sampling system 5 and the gas filtering sampler 42 are sequentially arranged in different independent sampling layers of different depths, which are sealed by a first packer 31, a second packer 32, a third packer 33 and a fourth packer 34, the liquid temperature sensor 63 and the gas temperature sensor 64 in the temperature control system 6 are respectively connected (closely attached) with the sampling pipeline 22 of the U-shaped liquid taking pipe 2 and the gas control and sampling pipe 41 of the I-shaped gas taking pipe 4. Porous pipe is liquid sampling system 5 in pit contains first layer porous pipe sampling device 51, second floor porous pipe sampling device 52, third layer porous pipe sampling device 53, first layer porous pipe sampling device 51 is including the first layer upper portion adapter 511 of connecting from top to bottom, first layer porous pipe sampling portion 512, second floor porous pipe sampling device 52 is including the second floor upper portion adapter 521 of connecting from top to bottom, second floor porous pipe sampling portion 522, third layer porous pipe sampling device 53 is including connecting third layer upper portion adapter 531 from top to bottom, third layer porous pipe sampling portion 532.

The functions and the connection modes of other parts are described as follows:

as shown in fig. 1, the U-shaped liquid taking tube 2 includes a control tube 21, a sampling tube 22, and a liquid sampling tube 23 with a liquid check valve 20 mounted at the lower part; the liquid sampling pipe 23 further comprises a first layer liquid sampling pipe 231, a second layer liquid sampling pipe 232, a third layer liquid sampling pipe 233 and the like which are connected through the automatic multi-way valve 7; the U-shaped part of the U-shaped liquid taking tube 2 of the control pipeline 21 and the sampling pipeline 22 is a multiphase fluid sample storage unit for standing and depositing, and is also a main flowing place of the high-pressure low-density driving fluid. The method is characterized in that: the control pipeline 21 and the sampling pipeline 22 are connected with the ground control system 1, the ground control system 1 controls the pressure, the flow rate and the sampling process of fluid in the U-shaped liquid taking pipe 2, a liquid one-way valve 20 is installed on a unique channel pipeline through which underground fluid enters the U-shaped liquid taking pipe 2 for a target sampling position on the liquid sampling pipe 23 at the lower part of the U-shaped liquid taking pipe 2 to prevent the liquid layers from streaming, the fluid flowing direction of the liquid one-way valve 20 is from bottom to top, and the liquid sampling pipe 23 penetrates through the packer system 3 to be connected with a perforated pipe underground liquid sampling system (5).

Referring to FIG. 2, the surface control system 1 includes a pressure source 10, a first driving pipe 11, a fluid pressure reducing valve 12, a control panel 13, and a booster pump 14, wherein the pressure source 10 uses a high-pressure low-density inert gas container (e.g., N)₂Ar, Kr, etc.) characterized by: the pressure source 10 is connected with a first driving pipe 11, a fluid pressure reducing valve 12 is arranged on the first driving pipe 11, and the first driving pipe 11 is connected with a control panel 13; the first driving pipes 11 are respectively connected with a pressure source pressure gauge P in a control panel 13₀The first liquid driving pipe 1101, the first gas driving pipe 1103, the driving pipeline and the control panel are made of corrosion-resistant materials. The first driving pipe 11 is a main driving pipeline and is driven by connecting each branch driving pipelineFidelity sampling of the U-shaped liquid taking pipe 2 and the I-shaped gas taking pipe 4; the rear ends of the first gas driving tube 1103, the first gas driving tube valve 1203 and the gas sampling pressure gauge P are respectively arranged at₃The second gas driving pipe 1104 is connected with a first gas sampling pipe 1114 provided with a first gas sampling pipe valve 1214; the first gas driving tube 1103, the first gas sampling tube 1114 and the valves thereon function as: controlling the process of pressurizing to assist sample introduction or depressurizing to assist fluid sampling when the I-shaped gas taking tube 4 is used for sampling in the sampling process; the second gas driving pipe 1104 is connected to the gas control and sampling pipe 41 in the type I gas taking pipe 4. Gas control and sampling tube 41 functions: delivering or venting high pressure relatively inert gas (N) to the sample formation set by the packer system 3 during sampling₂Ar, Kr and the like) to control the formation pressure, assist the liquid sampling of the U-shaped liquid taking pipe and directly carry out gas sampling; the end of the first gas sampling tube 1114 is communicated with the back 14 of the booster pump, the gas sampling container 1401 and the liquid sampling container 1402, and the booster pump 14 and the connected sampling container function as: when the liquid sampling work is needed, the liquid sampling container 1402 quantitatively collects high-pressure inert gas released by emptying in the U-shaped liquid taking pipe 2, and the collected gas is injected back into the sampling stratum through the pressurizing pump 14 for reuse when the stratum is pressurized, the collected high-pressure inert gas can also be provided for being injected back into the U-shaped liquid taking pipe 2 to be part of driving force when the liquid sampling is carried out, until the liquid sampling is finished, the gas sampling container 1401 collects a gas sample taking the high-pressure inert gas as a carrier, and finally the gas sampling is carried out; the first liquid driving pipe 1101 is provided with a first liquid driving pipe valve 1201, the tail end of the first liquid driving pipe 1201 conveys and discharges driving gas which is inert relative to high pressure in the U-shaped liquid taking pipe 2 in the sampling process, and the first liquid driving pipe 1101 is respectively provided with a second liquid driving pipe valve 1202 and a liquid driving pressure gauge P₁A second liquid sampling pipe 1112 provided with a second liquid sampling pipe valve 1212 connected to the second liquid driving pipe 1102; the second liquid driving pipe 1102 controls the driving flow in the U-shaped liquid taking pipe 2 through a valve and a pressure gauge arranged on the second liquid driving pipe during pressure reduction, emptying and pressurization samplingPressure and flow rate of the body; the second liquid driving tube 1102 is matched with the second liquid sampling tube 1112 to control the pressure and flow rate of driving fluid in the tube when the left control pipeline 21 of the U-shaped liquid taking tube 2 connected with the tail end of the second liquid driving tube 1102 is used for sampling and reducing pressure; the left end of the second liquid sampling pipe 1112 provided with the second liquid sampling pipe valve 1212 is respectively connected with the first liquid driving pipe 1101 provided with the first liquid driving pipe valve 1201, and is provided with the second liquid driving pipe valve 1202 and a liquid driving pressure gauge P₁A second liquid drive pipe 1102; the right end of the second liquid sampling pipe 1112 is connected with a first liquid sampling pipe valve 1211 and a liquid sampling pressure gauge P₂First liquid sampling tube 1111 and third liquid sampling tube 1113; the first liquid sampling tube 1111 and the third liquid sampling tube 1113, and a valve and a pressure gauge arranged on the first liquid sampling tube and the third liquid sampling tube functionally control the evacuation of high-pressure driving fluid in the U-shaped liquid taking tube 2 during the pressure reduction and sample injection and the sample discharge of liquid during the sampling; the end of the third liquid sampling tube 1113 is connected with the liquid sampling container 1402 and the first gas sampling tube 1114 through the booster pump 14; the liquid sampling container 1402 quantitatively collects high-pressure inert gases released during pressure reduction and sample injection in a U-shaped liquid taking pipe 2 connected with the tail end of a first liquid sampling pipe 1111, and the high-pressure inert gases are injected back into a sampling stratum through a pressure pump 14 and a first gas sampling pipe 1114 during stratum pressurization, and are injected back into the U-shaped liquid taking pipe 2 through the pressure pump 14, a third liquid sampling pipe 1113 and a second liquid sampling pipe 1112 during liquid sampling to drive sampling for repeated use, and multiphase fluid samples which are balanced in standing and permeate into the U-shaped liquid taking pipe 2 through a porous pipe downhole liquid sample injection system 5 are sequentially quantitatively collected during liquid sampling; the ground control system 1 is a main facility for controlling sampling pressure and flow rate of the U-shaped liquid taking pipe 2 and the I-shaped gas taking pipe 4 during sampling; the pressure source 10 can use other high-pressure low-density fluid as driving force (driving pressure is more than 100MPa) within the acceptable range without influencing the physical property analysis of the sample, the sampling pipe line of the driving pipe uses 316L stainless steel pipe material with corrosion-resistant diameter of 1/8, and the control panel 13, valves, pressure gauges and other components can be properly relaxed (both manual control valve and automatic control valve) on the premise of not influencing the normal working performance due to the selection standard of ground material.

As can be seen from fig. 7, the packer system 3 comprises a first packer 31, a second packer 32, a third packer 33, a fourth packer 34, etc. (which may continue to be connected in parallel as required) connected in parallel inside the well; the method is characterized in that: the first packer 31, the second packer 32, the third packer 33 and the fourth packer 34 in the packer system 3 are connected in parallel, the packer system 3 is set in the underground during sampling to enable target sampling positions with different depths to form a relatively stable closed environment, and the packers can be selected from products which can be connected in series in a layered mode as follows: the packer is a standard product packer for the oil department of the mines such as Y241, Y341 and the like.

As can be seen from fig. 6, the multi-hole tube downhole liquid sampling system 5 comprises a first layer of multi-hole tube sampling device 51, a second layer of multi-hole tube sampling device 52, and a third layer of multi-hole tube sampling device 53 connected in parallel through an automatic multi-way valve 7; the method is characterized in that: in the multi-hole tube downhole liquid sampling system 5, a first layer of multi-hole tube sampling device 51, a second layer of multi-hole tube sampling device 52 and a third layer of multi-hole tube sampling device 53 are arranged in independent sampling positions with different depths, which are set by a first packer 31, a second packer 32, a third packer and a

fourth packer

33 and 34. The porous tube sample injection device is divided into an upper adapter 510 and a porous tube sample injection part 520 which are communicated up and down; the upper adapter 510 comprises a first layer upper adapter 511, a second layer upper adapter 521, and a third layer upper adapter 531; the multi-hole tube sample injection part 520 comprises a first layer of multi-hole tube sample injection part 512, a second layer of multi-hole tube sample injection part 522 and a third layer of multi-hole tube sample injection part 532; wherein the upper end of the first layer upper adapter (511) is connected with a first layer liquid sample inlet pipe (231) which passes through a first packer (31) to be connected with an automatic multi-way valve (7), and the lower end is connected with a first layer porous pipe sample inlet part (512); the upper end of a second layer upper adapter (521) is connected with a second layer liquid sample inlet pipe (232) and penetrates through a second packer (32) and a first packer (31) to be connected with an automatic multi-way valve (7), and the lower end of the second layer upper adapter is connected with a second layer porous pipe sample inlet part (522); the upper end of the upper adapter (531) of the third layer is connected with a liquid sample inlet pipe (233) of the third layer, penetrates through a third packer (33), a second packer (32) and a first packer (31) and is connected with an automatic multi-way valve (7), and the lower end of the upper adapter of the third layer is connected with a sample inlet part (532) of a porous pipe of the third layer; the upper end of the upper adapter 510 is connected with an automatic multi-way valve 7 through a liquid sample inlet pipe 23, the lower end is connected with a multi-hole pipe sample inlet part 520, wherein the upper end of a first layer liquid sample inlet pipe 231 is connected with the automatic multi-way valve 7, the lower end passes through a first packer 31 to be connected with a first layer upper adapter 511, and the lower end of the first layer upper adapter 511 is connected with a first layer multi-hole pipe sample inlet part 512; the upper end of the second layer liquid sample inlet pipe 232 is connected with the automatic multi-way valve 7, the lower end of the second layer liquid sample inlet pipe passes through the first packer 31 and the second packer 32 and is connected with the second layer upper adapter 521, and the lower end of the second layer upper adapter 521 is connected with the second layer porous pipe sample inlet part 522; the upper end of the third layer of liquid sample inlet pipe 233 is connected with the automatic multi-way valve 7, the lower end of the third layer of liquid sample inlet pipe passes through the first packer 31, the second packer 32 and the third packer 33 to be connected with the third layer of upper adapter 531, the third layer of upper adapter 531 is connected with the lower end of the third layer of porous pipe sample inlet part 532, and the porous pipe downhole liquid sample inlet system 5 is a sample inlet system of the U-shaped liquid taking pipe 2 and a downhole multiphase fluid sample inlet separation place; multiphase fluid after standing and separating in the underground of the sampling target stratum enters the U-shaped liquid taking pipe 2 through the communicating liquid sampling pipe 23 and the automatic multi-way valve 7. The porous pipe sample injection part 520 connected with the upper adapter 510 is main sample injection equipment made of porous materials, the whole body is a cylindrical lower opening, a high-permeability filter element can be installed at the opening to prevent pipeline blockage when more impurities exist underground, multiphase fluid sample injection enters the inner cavity of the porous pipe through the lower opening and the wall of the porous pipe, and the porous materials have special indication wettability and affinity and can screen multiphase mixed fluid entering the inner cavity of the porous pipe underground. In this example, a porous material (porous metal, porous ceramic, porous plastic, etc.) with hydrophobicity and lipophilicity is selected, a porous tube sampling system with hydrophobicity and lipophilicity allows oil in multiphase fluid to pass through the tube wall and prevents water from passing through the tube wall in a well, the screened oil and the oil of the multiphase fluid flowing into the porous tube sampling device from a lower sampling port are settled on the upper part of an inner cavity of a tube body and are balanced, and then separation and sampling are completed.

As can be seen from fig. 6, the type I gas intake tube 4: comprises a gas control and sampling tube 41 and a gas filtering sampler 42 which are connected up and down; the gas control and sampling tube 41 further comprises a first layer control and sampling tube 411, a second layer control and sampling tube 412 and a third layer control and sampling tube 413 which are connected in parallel through the automatic multi-way valve 7, and the gas filtering sampler 42 comprises a first layer gas filtering sampler 421, a second layer gas filtering sampler 422 and a third layer gas filtering sampler 423. The method is characterized in that: the upper end of the gas control and sampling pipe 41 is connected with the ground control system 1, and the lower end of the gas control and sampling pipe passes through the sampling stratum with different depths and is set by a first packer 31, a second packer and a third packer in the packer system 3 to be connected with a gas filtering sampler 42; wherein the upper end of the first layer control and sampling pipe 411 is connected with an automatic multi-way valve 7, and the lower end thereof passes through a first packer 31 to be connected with a first layer gas filtering sampler; the upper end of the second layer control and sampling pipe 412 is connected with an automatic multi-way valve 7, and the lower end passes through a first packer 31 and a second packer 32 to be connected with a second layer gas filtering sampler 422; the upper end of the third layer gas control and sampling pipe 413 is connected with an automatic multi-way valve 7, and the lower end passes through the first packer 31, the second packer 32 and the third packer 33 to be connected with a third layer gas filtering sampler 423. The gas filtering sampler 42 can filter impurities to prevent solid suspended matters or particles from clogging the sampling tube, the gas sampling method uses high-pressure low-density fluid to be injected into a target sampling layer firstly to pressurize and assist the liquid sampling of the U-shaped liquid taking tube 2, the fluid injected before the pressure reduction release of a sampling stratum is finished after the liquid sampling, and the gas sample reaches the ground together when the pressure reduction release is carried out by using the high-pressure low-density fluid as a carrier.

As can be seen from fig. 3, the control pipeline 21, the sampling pipeline 22, the gas control and sampling pipe 41, the distributed temperature control element 62, the liquid temperature sensor 63, and the gas temperature sensor 64 are wrapped by the thermal insulation layer 61 in the temperature control system 6, wherein the distributed temperature control element 62 is connected to the control pipeline 21, the sampling pipeline 22, and the gas control and sampling pipe 41, and the liquid temperature sensor 63 and the gas temperature sensor 64 are connected to the sampling pipeline 22 and the gas control and sampling pipe 41, respectively. The distributed temperature control element 62 of the temperature control system 6 adopts a distributed temperature control mode, the temperature of the stratum is higher than the earth surface temperature generally, the temperature control mainly adopts heating, the heating element can adopt heating devices such as a distributed resistance wire and a water bath pipeline, and heating parts are conventional elements and are sold on the market. If the distributed temperature control element has a refrigeration function, a water bath pipeline and the like can be adopted to control the temperature of the gas in the control pipeline 21 and the sampling pipeline 22 in the U-shaped liquid taking pipe 2 and the temperature of the fluid in the sampling pipe 41 in the I-shaped gas taking pipe 4. The insulating layer 61 is made of rubber or plastic having low thermal conductivity. The liquid temperature sensor 63 and the gas temperature sensor 64 in the temperature control system 6 are respectively connected (closely attached) to the sampling pipeline 22 and the gas control and sampling pipe 41. The sensors, the control pipeline 21 of the U-shaped liquid taking pipe 2, the sampling pipeline 22 and the gas control and sampling pipe 41 of the I-shaped gas taking pipe 4 are preferably coated with heat conducting silica gel or other soft contact materials, the temperature sensed by the temperature sensors is ensured to be consistent with the temperature of fluid in the pressure container, the temperature sensors can adopt point type temperature sensors or distributed type sensors, FBG grating sensors, optical fiber sensors, resistance type sensors and the like, the optical fiber grating temperature sensors are recommended to be used, cables are not needed, the number of the sensors is increased, and the temperature control precision is improved.

The external controller controls the distributed temperature control element to adjust the temperature according to the data of the temperature sensor, the control method refers to a standard temperature control method, and the external temperature control component adopts standard products, such as: temperature controller, Labview software control of NI (national instruments) and Texas instruments logic + electrical heating or cooling to provide heat or cold energy;

automatic multi-way valve: the automatic multi-way valve 7 is a circuit-controlled multi-way connecting valve and mainly used for butting different liquid sample introduction pipes 23 and gas control and sampling pipes 41 with any porous pipe underground liquid sample introduction system 5 and a gas sampling filter 42 in a sampling stratum set by the packer system 3; the automatic multi-way valve 7 has a large number of liquid porous tube sampling devices 5 and gas sampling filters 42 which need to be connected, and can be used in series connection and matching with a plurality of valves, and standard products of the departments of land and mine, petroleum and natural gas are used when products are selected.

Through the specific technical measures, the subsystems of the sampling device are effectively combined together, and the smooth operation of the sampling device is guaranteed. About the experimental effect condition (please see table 1, please see table 2), table 1 is for using the utility model discloses the thunder magnetic assay parameter of the water sample of device technology sample, table 2 is for using the utility model discloses the experimental data of titrating of the water sample of device technology sample.

TABLE 1

Sample numbering	PH	ORP(mv)	Conductivity (us/cm)	Dissolved oxygen (mg/L)	Temperature (. degree.C.)
						1	10.69	-128.3	1349	16.01	22.2
2	10.72	-111.3	1332	29.13	22.1
						3	10.73	-115.9	1404	21.56	22.3
4	10.7	-149.3	1419	24.01	22.1
						5	10.93	-113.1	1297	25.58	22.4
6	10.73	-109.1	1361	24.42	22.3
						7	10.25	-46.8	1310	2.59	29.5
8	10.36	-97.6	1377	0.38	29.7
						9	10.57	-78.8	1374	6.01	29.5
10	10.89	-238.4	1432	2.3	18.5
						11	11.02	-326.2	1156	0.36	18.7
12	11.26	-254.8	1232	0.46	18.2
						13	11.02	-283.6	1363	0.46	18.7

TABLE 2

Example 3:

as shown in the figures 8, 9 and 10, the original sampling method and the device and the sampling method are used for sampling in the drilling well with the depth of 1000m (the underground temperature is about 30 ℃), the stability of the pressure of the underground fluid in the sampling process is greatly improved, and the effective controllability of the device on the external conditions of the fluid in the sampling process is verified. The procedure was as in example 1.

Claims

1. The utility model provides a heterogeneous flow fidelity sampling device based on well drilling, it includes ground control system (1), U type liquid taking pipe (2), packer system (3), I type gas taking pipe (4), perforated pipe liquid sampling system (5) in the pit, temperature control system (6), automatic valve (7) that lead to more, its characterized in that: a pressure source (10) in the ground control system (1) is connected with a control panel (13) through a first driving pipe (11), the tail ends of a control pipeline (21), a sampling pipeline (22) and a liquid sampling pipe (23) in a U-shaped liquid taking pipe (2) are connected with each other, the liquid sampling pipe (23) also comprises a first layer of liquid sampling pipe (231), a second layer of liquid sampling pipe (232) and a third layer of liquid sampling pipe (233), the upper ends of the control pipeline (21) and the sampling pipeline (22) are connected with the lower end of the ground control system (1) and the liquid sampling pipe (23), the liquid sampling pipe (23) is provided with a liquid one-way valve (20) which is communicated with an automatic multi-way valve (7) and then passes through a packer system (3) to be connected with a porous pipe downhole liquid sampling system (5), the upper end of a gas control and sampling pipe (41) in an I-shaped gas taking pipe (4) is connected with the ground control system (1), the lower end of the automatic multi-way valve (7) is communicated with the lower end of the automatic multi-way valve (7), the lower end of the automatic multi-way valve penetrates through a packer system (3) to be connected with a gas filtering sampler (42) in an I-type gas taking pipe (4), a first layer of gas filtering sampler (421), a second layer of gas filtering sampler (422) and a third layer of gas filtering sampler (423) in the gas filtering sampler (42) and is respectively connected with a first layer of porous pipe sample introduction device (51), a second layer of porous pipe sample introduction device (52) and a third layer of porous pipe sample introduction device (53) in a porous pipe downhole liquid sample introduction system (5) in parallel through the automatic multi-way valve (7), the automatic multi-way valve and the automatic multi-way valve are sequentially placed in different independent sampling positions of different depths, namely a first packer (31), a second packer (32), a third packer (33) and a fourth packer (34), a liquid temperature sensor (63) and a gas temperature sensor (64) in a temperature control system (6) ) Gas control and sampling tube (41) link to each other, porous pipe downhole liquid sampling system (5) contain first layer porous pipe sampling device (51) through automatic multi-way valve (7) parallelly connected, second layer porous pipe sampling device (52), third layer porous pipe sampling device (53), first layer porous pipe sampling device (51) are including first layer upper portion adapter (511) of connecting from top to bottom, first layer porous pipe sampling portion (512), second layer porous pipe sampling device (52) are including second layer upper portion adapter (521) of connecting from top to bottom, second layer porous pipe sampling portion (522), third layer porous pipe sampling device (53) are including third layer upper portion adapter (531), third layer porous pipe sampling portion (532) of connecting from top to bottom.

2. The drilling-based multiphase flow fidelity sampling device of claim 1, wherein: the ground control system (1) comprises a pressure source (10), a first driving pipe (11), a fluid pressure reducing valve (12), a control panel (13) and a booster pump (14); the pressure source (10) is connected with a first driving pipe (11), a fluid pressure reducing valve (12) is arranged on the first driving pipe (11), and the first driving pipe (11) is connected with a control panel (13); the first driving pipe (11) is respectively connected with a pressure source pressure gauge (P) in the control panel (13)₀) The gas sampling device comprises a first liquid driving pipe (1101) and a first gas driving pipe (1103), wherein the rear end of the first gas driving pipe (1103) provided with a first gas driving pipe valve (1203) is respectively provided with a gas sampling pressure gauge (P)₃) The second gas driving pipe (1104) and a first gas sampling pipe (1114) provided with a first gas sampling pipe valve (1214) are connected; the second gas driving pipe (1104) is connected with a gas control and sampling pipe (41) in the I-shaped gas sampling pipe (4), and the tail end of the first gas sampling pipe (1114) is connected with a pressure pump (14) and then is connected with a gas sampling container (1401) and a liquid sampling container (1402); first liquid driveA first liquid driving pipe valve (1201) is arranged on the pipe (1101), and the first liquid driving pipe (1101) is respectively provided with a second liquid driving pipe valve (1202) and a liquid driving pressure gauge (P)₁) The second liquid driving pipe (1102) is connected with a second liquid sampling pipe (1112) provided with a second liquid sampling pipe valve (1212), and the tail end of the second liquid driving pipe (1102) is connected with a control pipeline (21) of a U-shaped liquid taking pipe (2); the left end of a second liquid sampling pipe (1112) provided with a second liquid sampling pipe valve (1212) is respectively connected with a first liquid driving pipe (1101) provided with a first liquid driving pipe valve (1201), the second liquid driving pipe valve (1202) and a liquid driving pressure gauge (P)₁) A second liquid drive pipe (1102); the right end of the second liquid sampling pipe (1112) is respectively connected with and provided with a first liquid sampling pipe valve (1211) and a liquid sampling pressure gauge (P)₂) The first liquid sampling tube (1111) and the third liquid sampling tube (1113); the end of the third liquid sampling pipe (1113) is communicated with a booster pump (14) and then is connected with a liquid sampling container (1402) and a gas sampling container (1401); the liquid sampling container (1402) collects a high-pressure driving fluid discharged and decompressed in a U-shaped liquid taking pipe (2) connected with the tail end of the first liquid sampling pipe (1111) in a constant volume mode and a fluid sample injected through the perforated pipe downhole liquid sampling system (5).

3. The drilling-based multiphase flow fidelity sampling device of claim 1, wherein: in the packer system (3), a first packer (31), a second packer (32), a third packer (33) and a fourth packer (34) are connected in parallel.

4. The drilling-based multiphase flow fidelity sampling device of claim 1, wherein: in the multi-hole tube downhole liquid sampling system (5), a first layer of multi-hole tube sampling device (51), a second layer of multi-hole tube sampling device (52) and a third layer of multi-hole tube sampling device (53) are placed in different-depth independent sampling positions seated and sealed by a first packer (31), a second packer (32), a third packer (33) and a fourth packer (34) and are connected in parallel through an automatic multi-way valve (7), and the multi-hole tube sampling device is divided into an upper adapter (510) and a multi-hole tube sampling part (520) which are communicated up and down; the upper adapter (510) comprises a first layer upper adapter (511), a second layer upper adapter (521) and a third layer upper adapter (531); the multi-hole tube sample injection part (520) comprises a first layer of multi-hole tube sample injection part (512), a second layer of multi-hole tube sample injection part (522) and a third layer of multi-hole tube sample injection part (532), wherein the upper end of a first layer of upper adapter (511) is connected with a first layer of liquid sample injection tube (231) and penetrates through a first packer (31) to be connected with an automatic multi-way valve (7), and the lower end of the first layer of upper adapter is connected with the first layer of multi-hole tube sample injection part (512); the upper end of a second layer upper adapter (521) is connected with a second layer liquid sample inlet pipe (232) and penetrates through a second packer (32) and a first packer (31) to be connected with an automatic multi-way valve (7), and the lower end of the second layer upper adapter is connected with a second layer porous pipe sample inlet part (522); the upper end of the upper adapter (531) of the third layer is connected with a liquid sample inlet pipe (233) of the third layer, penetrates through a third packer (33), a second packer (32) and a first packer (31) and is connected with an automatic multi-way valve (7), and the lower end of the upper adapter of the third layer is connected with a sample inlet part (532) of a porous pipe of the third layer; the multi-hole pipe sample injection part (520) screens the types of fluids entering the inner cavity of the multi-hole pipe through surface affinity and hydrophobicity, the content of the fluids needing to be sampled is increased or reduced, and after the multi-phase fluids are kept stand and balanced underground in the multi-hole pipe sample injection part (520), the multi-phase fluids enter the U-shaped liquid taking pipe (2) through the liquid sample injection pipe (23) communicated with the upper adapter (510) and the automatic multi-way valve (7).

5. The drilling-based multiphase flow fidelity sampling device of claim 1, wherein: the I-shaped gas taking pipe (4) consists of a gas control and sampling pipe (41) and a gas filtering sampler (42) which are connected up and down; gas control and sampling tube (41) still include through the parallelly connected first floor control of automatic multi-way valve (7) and sampling tube (411), second floor control and sampling tube (412), third floor control and sampling tube (413), gas filtration sampler (42) are including first floor gas filtration sampler (421), second floor gas filtration sampler (422), third floor gas filtration sampler (423), ground control system (1) is connected to gas control and sampling tube (41) upper end, gas filtration sampler (42) in the sample stratum of the different degree of depth that packer system (3) set is passed to the lower extreme are connected.

6. The drilling-based multiphase flow fidelity sampling device of claim 1, wherein: temperature control system (6) in insulating layer (61) parcel control pipeline (21), sample pipeline (22), gas control and sampling tube (41), distributed temperature control element (62), liquid temperature sensor (63), gas temperature sensor (64), wherein distributed temperature control element (62) and control pipeline (21), sample pipeline (22), gas control and sampling tube (41) link to each other, liquid temperature sensor (63), gas temperature sensor (64) link to each other with sample pipeline (22) and gas control and sampling tube (41) respectively.