CN216894376U - Single-phase heat preservation storage tank mechanism for formation fluid sampling while drilling - Google Patents

Abstract

The utility model relates to a single-phase heat-preservation storage tank mechanism for sampling formation fluid while drilling in the technical field of petroleum and natural gas drilling formation fluid sampling. The fluid pumped from the formation can be stored in the device of the utility model, and the stored fluid is ensured to be in a single phase state through heat preservation and air cushion pressurization during the tripping process. The heat preservation storage tank mechanism consists of a plurality of independent sample tanks, the overflow disc, the blind plug disc and the shunt joint are used for fixing, and the shunt joint can distribute and store the qualified formation samples measured by the fluid surveying and mapping short section into the sample tanks. The sample tank is a piston cylinder with a heat preservation function and is divided into three variable-volume chambers by two free pistons, the left end chamber stores a formation fluid sample, the middle chamber is injected with high-pressure inert gas, and the right end chamber is connected with the shaft annulus. The single-phase state of the formation fluid sample is maintained by utilizing the characteristic of injecting high-pressure gas into the middle cavity and the physical heat preservation of the heat preservation layer.

Description

Single-phase heat preservation storage tank mechanism for formation fluid sampling while drilling

Technical Field

The utility model relates to the technical field of petroleum and natural gas drilling stratum fluid sampling. In particular to a single-phase heat preservation storage tank mechanism for a formation fluid sample while drilling, which is used for keeping the sample in a single-phase state until the sample is delivered to a testing laboratory.

Background

The physical properties of formation fluids vary greatly from geological condition to geological condition. The properties of chemical components, viscosity, gas phase envelope, solid phase envelope and the like of the stratum reservoir have great influence on the evaluation of the physical properties of the reservoir. In addition, these characteristics also determine whether an oil field can be effectively developed and the duration, cost and unit price of production.

For these reasons, accurate measurements of reservoir fluid properties are of paramount importance. Among them, preservation of the in-situ phase of the sample is most important.

There are a variety of methods available to obtain wellbore fluid samples. One such method is by running a while drilling tool into the wellbore to obtain virgin formation fluids from the exposed wellbore wall by suction. Oil reservoirs are usually located at kilometers or kilometers of surface, at pressures as high as tens of megapascals and at temperatures even exceeding 150 ℃ to over 200 ℃. Due to such downhole environmental extremes, drilling a formation fluid sample from downhole into the surface environment may result in several irreversible changes in the sample. During the rise of a fluid sample from downhole to surface, both pressure and temperature drop dramatically, which can cause certain components of the formation fluid to irreversibly resolve or otherwise change from the sample solution, resulting in distortion of the data measured in the laboratory. For example: during well development, oil wells become waxed and cause severe damage that can be completely avoided if the precise composition, pressure and temperature of the formation fluid can be accurately tested and targeted measures taken in advance.

Early sample chambers used fixed volume sample chambers and no thermal insulation layer was present. After the tool is lowered to the sampling position, the valve is opened, the stratum sample is extracted, and the valve is closed after the sample chamber is filled. During the process of retrieving the tool to the surface, the fixed volume of the sample causes cooling of the sample, a pressure drop due to changes in ambient temperature, and often results in the vaporization of some of the components of the sample, and the irreversible precipitation of some of the solid components. Even if heating and pressurizing are carried out in a laboratory at the later stage to try to restore the state of the original sample, possible errors still exist, and the yield evaluation is negatively influenced.

To prevent phase change of the formation fluid sample during transport to a laboratory recovery or to a pressurized storage, "CN 103410506A, a gas spring assembly and formation fluid sampler" provides a double-barreled gas spring assembly that exerts a spring force on the formation fluid to maintain it in a single phase. However, no insulation is provided by the device, and the temperature reduction is just the biggest impact on this type of tank.

The utility model provides a single-phase heat-preservation storage tank mechanism for a formation fluid sample while drilling, which comprises a plurality of independent sample tanks, wherein a plurality of formation sampling points can be sampled while drilling, and the fluid sample of each sampling point is stored in the independent sample tank. It is another object of the present invention to provide a downhole fluid sample storage tank that maintains the sample at or above the bubble point pressure during its passage from the downhole to the surface. In addition, the tool of the utility model adopts the heat insulation layer, reduces the temperature reduction of the formation fluid in the process of tripping, and provides a formation fluid sample which is closer to the actual condition of the formation for a laboratory.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a single-phase heat-preservation storage tank mechanism for sampling formation fluid while drilling, aiming at the defects in the prior art. The mechanism is placed in a formation fluid sampling tool while drilling, and has the main functions of storing formation fluid pumped from a formation by the sampling tool and ensuring that the stored fluid is kept in a single-phase state in the process of tripping through a heat preservation and air cushion increasing mode. The storage tank mechanism of the utility model comprises a plurality of independent sample tanks, and a plurality of strata can be sampled and stored by the control mechanism in the flow dividing joint.

The technical scheme is as follows:

a single-phase heat preservation storage tank mechanism for sampling formation fluid while drilling comprises a surveying and mapping short section and an outer shell which are sequentially connected, wherein a plurality of sample tanks which are distributed in an annular array are arranged in the outer shell, one ends of the sample tanks are connected with a shunt joint, and the shunt joint is inserted into the surveying and mapping short section; a plurality of shunt passages corresponding to the number of the sample tanks are arranged in the shunt joint, and the sample tanks are communicated with the corresponding shunt passages.

Furthermore, the waist parts of the plurality of sample tanks are inserted in the shunt disc, and the other ends of the sample tanks are inserted in the blind jacks; the shunt plate is provided with through holes which are in one-to-one correspondence with the sample tanks, and the blind jacks are blind holes which are in one-to-one correspondence with the sample tanks and are arranged at one end of the outer shell; the flow distribution disc and the blind insertion hole are provided with a hollow flow passage and an annular flow passage; the excircle of flow distribution plate contacts with the inner wall of the outer shell.

Furthermore, the hollow flow channel is circular, and the annular flow channel is a plurality of semicircular flow channels.

Further, the sample tank comprises a cylinder end plug and a cylinder body which are connected in sequence;

the cylinder end plug is internally provided with a three-way pore passage, a drilling fluid pore passage and a stratum fluid pore passage, a communicating pipe is fixedly arranged in the middle of the cylinder body, a left piston and a right piston are slidably sleeved on the communicating pipe, and the left piston and the right piston divide the space in the cylinder body into a gas chamber, a sample chamber and a slurry chamber from left to right in sequence;

one end of the three-way pore canal is communicated with the gas cavity, one end of the three-way pore canal is provided with an electromagnetic three-way valve, and the other end of the three-way valve is provided with a plug;

the drilling fluid pore passage is communicated with the communicating pipe, and the other end of the communicating pipe is communicated with the slurry chamber;

a baffle ring is arranged between the right end surface of the cylinder end plug and the left end surface of the left piston;

the left piston is provided with 2 valve holes, 1 valve hole is provided with an air injection valve, and 1 valve hole is provided with a needle valve.

Further, a discharge valve is further arranged in the cylinder end plug and communicated with the three-way pore passage.

Furthermore, the side wall of the other end of the communicating pipe is provided with a small hole, and the communicating pipe is communicated with the slurry chamber through the small hole.

Furthermore, a space for wrapping the whole cylinder body is arranged in the wall of the cylinder body, and heat insulation materials are filled in the space.

Furthermore, a filling hole is formed in the outer portion of the cylinder body and communicated with the space.

Further, the thermal insulation material is liquid expansion thermal insulation material.

Furthermore, the inner and outer walls of the cylinder body are coated with heat-insulating coatings.

The utility model has the advantages that:

by applying the single-phase heat-preservation storage tank mechanism for sampling formation fluid while drilling provided by the patent, the formation fluid pumped while drilling can be stored in a single sample tank after being analyzed by a fluid pollution rate measuring device, and the single-phase state of the formation fluid is kept in the process from the underground to the ground and a laboratory through heat preservation and pressurization treatment, so that the true reliability of formation fluid property parameter evaluation is improved.

Drawings

FIG. 1 is a schematic illustration of the location of the present invention in a formation fluid sampling and mapping while drilling tool.

FIG. 2 is a schematic structural diagram of a single-phase thermal insulation storage tank mechanism and a schematic structural diagram of a section A-A.

Fig. 3 is a schematic view of a single sample tank structure and a schematic view of a part of the structure in the direction of a.

FIG. 4 is a schematic diagram of the distribution of piston chambers during the drill-down process for a single sample canister of the present invention

Fig. 5 is a schematic diagram of the piston chamber distribution of a single sample tank of the present invention after sampling.

In the figure:

1. surveying and mapping short joint, 2, an outer shell, 3, a single-phase heat-preservation storage tank mechanism, 4, a measuring module, 5, a main pipeline, 6, an electromagnetic valve, 7, formation fluid, 8, a diversion channel, 9, an annular flow channel, 10, a hollow flow channel, 11, a blind jack, 12, a signal generator, 13, a ground control system, 14, a drilling tool, 15, a formation, 16, a sampling tool, 17, a power supply and control module, 18, a suction module, 19, a probe, 20, an inner wall of the outer shell, 21, a control valve, 22, a pipeline, 30, a diversion joint, 31, a sample tank, 32, a diversion disc, 33, a diversion joint bolt hole, 34, a sample tank bolt hole, 35, a cylinder end plug, 36, a cylinder body, 37, a left piston, 38, a right piston, 39, a baffle ring, 40, a screw plug, 41, an electromagnetic three-way valve, 42, a discharge valve, 43, a filling hole, 44, liquid heat-insulation material expansion, 45, 9, a left piston, a right piston, a left piston, a right piston, a left piston, a right valve, a left valve, a right valve, a left valve, a right valve, a pump, a, The device comprises a needle valve, 46, a gas injection joint, 47, a communication pipe, 48, a cylinder end plug outer sealing ring, 49, a cylinder end plug inner sealing ring, 50, a left piston sealing ring, 51, a formation fluid pore passage, 52, a three-way pore passage, 53, a communication pipe pore passage, 54, a gas chamber, 55, a right piston inner sealing ring, 56, a small hole, 57, a cylinder inner wall, 58, a right piston outer sealing ring, 59, a cylindrical cavity, 60, a drilling fluid channel, 61, an interval space, 62, a sample chamber, 63, a slurry chamber, 64 and a shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows:

the present invention is primarily applicable to formation fluid sampling and mapping while drilling tools 16, the aforementioned tools 16 generally including a power supply and control module 17, a power drive module 18, a pumping module 4, and the single phase insulated storage tank mechanism 3 of the present invention, with additional device options available.

Referring to fig. 1, the present invention is schematically shown in a formation fluid sampling and mapping while drilling tool, in which a formation fluid sampling and mapping while drilling tool 16 is lowered into a borehole along with a drilling tool 14, when it is desired to collect formation fluid of interest, a surface control system 13 sends a collection signal, a signal generator 12 generates a periodic drilling fluid pulse signal and transmits the signal downhole through the drilling tool 14 to the sampling tool 16, and the sampling tool 16 then extends a probe 19 with a sealed borehole wall out of the body, clings to the borehole wall and draws formation fluid from the formation 15.

The hydrostatic column pressure of the drilled wellbore is typically greater than the formation pressure, thus resulting in contamination of the near-wellbore wall attachment formation with drilling fluid. The initially pumped fluid is often not the original formation fluid and therefore the pumped fluid needs to be expelled into the wellbore through the pipeline 22, the specific pumped volume or time needs to be provided by a predictive model, or by a detection device.

After the virgin formation fluid is pumped, the control valve 21 in the probe 16 opens the valve passage to the main fluid transfer line 5 and stored in the single-phase insulated storage tank mechanism 3 provided by the present invention. The single-phase insulated storage tank mechanism 3 is typically integrated with several individual sample tanks 31 for taking multiple formation sample point fluid samples.

Referring to fig. 2 and 2-1, the structure of the single-phase heat preservation storage tank mechanism is schematic. The single-phase heat preservation storage tank mechanism 3 consists of a plurality of independent sample tanks 31. The diverter tray 32 and the blind receptacle 11 are provided with the same number of receptacles as the sample tanks 31 into which the sample tanks 31 can be inserted for securing. Meanwhile, the diverter plate 32 and the blind jacks 11 are provided with a plurality of semicircular 9 or circular 10 flow passages, and drilling fluid can be transmitted to a drilling tool below through the annular flow passage 9 and the hollow flow passage 10.

The left end of the sample tank 31 and the tap 30 are fixed by the tap bolt hole 33 and the sample tank bolt hole 34 which are matched. The blind jack 11 right-hand member face is spacing by 2 inner walls of shell body, inserts in fluid mapping nipple joint 1 through the reposition of redundant personnel joint 30 to it is spacing by 1 right-hand member faces of mapping nipple joint. The diverter disc 32 and blind receptacle 11 have an outer diameter less than the outer housing inner wall 20.

The mapping nipple 1 comprises a measuring module 4 for fluid property analysis, and can measure properties such as fluid temperature, pressure, viscosity, pollution rate and the like. After the formation fluid 7 is drawn from the probe 19 through the main transfer line 5 into the measurement module 4 for property measurement, if the formation fluid 7 is virgin clean fluid, the solenoid valve 6 is opened and the formation fluid is allowed to be stored in the sample tank 31.

The tap 30 has the same number of tap channels 8 as the number of sample tanks, and the fluid in the main line 5 is connected to the individual sample tanks 31 through the tap channels 8, respectively.

Referring to fig. 3 and 3-1, a schematic of a single sample tank configuration of the present invention is shown. The sample tank 31 is formed by a cylinder body 36 and a cylinder end plug 35 which are connected through threads and press a cylinder end plug outer sealing ring 48, and a closed cylindrical cavity 59 is formed.

In the cylindrical cavity 59, there are two left and right pistons 37 and 38 which can move left and right, the left and right pistons 37 and 38 divide the cylindrical cavity 59 into 3 chambers with variable volume, namely a sample chamber 62, a gas chamber 54 and a mud chamber 63, the sample chamber 62 is used for storing a stratum sampling sample, and the gas chamber 54 is a pre-injection high-pressure gas chamber and the mud chamber 63 are communicated with a shaft 64.

The middle of the cylindrical cavity 59 is provided with a communicating pipe 47, the left end of the communicating pipe is inserted into the cylinder end plug 35 and is sealed by a cylinder end plug inner sealing ring 49, and the right end is limited by the cylinder body inner wall 57. The communication pipe 47 can be used as a piston rod of the pistons 37 and 38, and is sealed with the pistons by the right piston inner seal 55. The two pistons 37, 38 also have a left piston outer seal ring 50 and a right piston outer seal ring 58 for sealing against the inner wall of the cylinder 36. The communicating tube 47 has a communicating tube port 53 communicating with the wellbore, the end of the port having an orifice 56 communicating with the mud chamber 63, and the end of the cylinder end plug 35 may communicate with the wellbore 64 through the port 60.

Before the sample chamber 31 is used, when high-pressure inert gas needs to be injected, the plug 40 connected with the cylinder end plug 35 is firstly removed, the high-pressure inert gas source is connected to the gas injection joint 46 of the left piston 37 through a straight hard pipe quick joint, and the gas chamber 54 is inflated. After inflation is complete, the check valve in the gas injection fitting 46 holds the gas in the gas chamber 54 while the disconnection is initiated. After the disconnection is completed, the gas injection tube is removed and the plug 40 is manually closed to ensure that the check valve has no leakage loss. If the temperature and pressure targets in the sample chamber 62 are to be measured, a miniature storage-type temperature and pressure measuring device can be placed before the plug 40 is closed, and after the sample is drained at the surface, the sensor can be removed and the data read back. These data provide process information about changes in sample properties when the pressure falls below the bubble point pressure due to mechanical failure or seal failure.

A degree of prediction of the temperature and pressure at the bottom of the well (depth of formation sample extraction) is used as a basis for the pressure of the gas filling the intermediate gas chamber 54. Due to the increased wellbore temperature, the gas pressure in the intermediate gas chamber 54 will typically be higher than the pressure at the surface. This increase in pressure is related to the physical properties of the gas, the absolute mass of the gas within the volume 54, and the initial inflation pressure and temperature. However, the resulting pressure value is preferably less than the hydrostatic column pressure at the bottom of the well.

After gas injection, the two pistons 37 and 38 move towards two opposite ends along the communicating pipe 47, the left piston 37 moves to the piston baffle ring 39 and is limited by the end face of the baffle ring, and the right piston 38 moves towards the opposite direction and is limited by the inner wall 57 at the right end of the cylinder body. At this point the central gas chamber volume is at a maximum and the sample chamber 62 and mud chamber 63 are at a minimum.

The left piston 37 is provided with a needle valve 45 for venting air, and when it is desired to vent the high pressure air from the intermediate air chamber 54, the piston 37 is rotated 180 degrees to place the needle valve against the three-way port 52, the plug 40 is removed, and a hard tube can be inserted into the needle valve 45 to vent the air.

With continued reference to fig. 3, the cylinder end plug 35 has 2 primary fluid flow passages 60, 52, the passage 60 communicating with the borehole annulus 64 through the communication tube bore 53 and mud chamber 63, with no valve therebetween, allowing free flow of drilling fluid in the annulus 64 and mud chamber 63, depending on the movement of the piston 38. One end of the channel 52 is connected with the sample chamber 62, the other end is provided with 3 different ports, the three-way hole 52 is directly connected with the sample chamber 62, and the other three outlets are in a T shape with the three-way hole 52. The formation fluid port 51 is connected to the pipeline 5, and the branch port of the tee port 52 which is upward is provided with an electromagnetic three-way valve 41 which can control the pumped formation fluid 7 to flow from the formation fluid port 51 and to be stored in the sample chamber 62 through the tee port 52. The down hole valve 42 is a quick connect fitting that connects the formation fluid in the sample chamber to the laboratory storage container.

The sample chamber communicating pipe 47 is sleeved with a baffle ring 39, the left end of the baffle ring 39 and the end surface of the cylinder end plug 35 limit, and the right end limits the left piston 37. The outer diameter of the baffle ring 39 is smaller than the inner diameter of the mounting position of the air injection valve and the needle valve mounted on the left piston 37, and the two valves 45 and 46 of the left piston 37 are protected from contacting the end faces of the cylinder end plugs.

The cylinder end plug 35 is provided with a connecting hole 34 for connecting and fastening to the tap 30 to fix the sample tank 31.

The sample tank cylinder 36 has a hollow space 61 dividing the cylinder into an inner part and an outer part, and is filled with a liquid expansion heat insulating material 44 through a filling hole 43 or a heat insulating foam material to perform heat insulation and preservation. The sample tank 36 may not be designed to be hollow, and thermal insulation coatings are sprayed on the inner and outer surfaces of the tank to preserve heat.

The work flow of the sample tank 31 is further explained in conjunction with fig. 4 and 5.

The type, nature and pressure of the injected gas of the intermediate gas chamber 54 is first determined based on the expected formation fluid pressure, temperature and fluid properties to ensure that possible temperature changes do not cause phase changes in the formation fluid.

As the tool enters the wellbore 64, drilling fluid in the wellbore 64 enters the mud chamber 63 through the ports 60, 53, as shown in fig. 4. When the tool reaches the bottom of the well, the pressure in the mud chamber 63 is equivalent to the bottom of the well pressure. Generally, the bottom hole static pressure is greater than the pressure at which the intermediate gas chamber 54 is precharged with gas due to an increase in bottom hole temperature. Driven by the wellbore pressure, the right piston 38 is urged to compress the intermediate gas chamber 54, thereby compressing the gas therein into pressure equilibrium with the wellbore pressure.

At this point, if formation sampling is desired, the formation fluid sampling while drilling device 16 is removed and a sealed suction probe 19 is pushed against the borehole wall and sealed. The formation fluid is pumped by a plunger pump, while pumped fluid 7 is pumped through line 5 to sample chamber 62. As shown in fig. 5, formation fluid 7 is typically passed through a formation fluid port 51, controlled by a solenoid valve 41 to a three-way port 52 and delivered to a sample chamber 62. It should be noted that the sample chamber 62 is designed to have a minimum or even zero pore volume in practice, or a pre-flush technique is designed to flush the fluid in the sample chamber 62 clean.

Typically, the pumping pressure to pump the formation fluid out of the sample chamber 62 is greater than the hydrostatic column pressure of the wellbore, thus pushing the two pistons 37, 38 to the right. Drilling fluid in the mud chamber 63 is drained back into the wellbore through the passages 56, 53, 60. The final state is that the piston 38 is in contact at the cylinder inner wall 57 wall.

The additional value pumped into the sample chamber 62 that exceeds the wellbore hydrostatic column pressure further compresses the gas in the intermediate gas chamber 54 until the pressure reaches the designed pumping pressure. At this point, the downhole automatic control solenoid 41 is closed and the sonde 19 is retracted from the borehole wall into the tool interior.

The utility model discloses a formation fluid sampling while drilling single-phase heat preservation storage tank mechanism, which is provided with a plurality of single-phase heat preservation sample tanks 31 and can sample and store formation fluid at a plurality of formation depths.

During the drilling of a formation fluid sample from downhole to the laboratory, the ambient temperature is gradually lowered. The formation fluid sample also experiences a temperature drop, but the rate of this heat loss is significantly attenuated by the thermal barrier material 44. It should also be noted that when the sample tank 31 is run into the wellbore, the temperature in the chamber is lower than the ambient temperature of the formation due to the presence of the insulating layer. As formation fluid enters the sample chamber 62, heat energy is transferred to surrounding structures, but the pressure does not change. Thus, the formation fluid in the sample chamber has a slightly higher specific gravity than the formation fluid at higher temperatures. In addition, the formation fluid collected downhole is at a lower temperature than it actually is.

The cooled formation fluid sample 7 is essentially in situ, and the pressure loss of the liquid is proportional to the temperature loss and the volumetric shrinkage height. Although the same thermal forces act on the pre-charge gas in the intermediate gas chamber 54, the temperature, pressure, volume properties of the gas are different from those of the formation fluid. Without gas leakage, the density and pressure drop of the gas chamber 54 due to cooling is much less than the density and pressure drop of the liquid in the sample chamber 62. Thus, pushing piston 37 to the left rebalances the formation fluid sample pressure with the chamber 54 compressible gas pressure, keeping it at a small pressure change, ensuring that the sample pressure remains above the critical bubble point pressure.

After the tool reaches the surface of the formation, it is connected to the discharge valve 42 by a hose resistant to high pressure, and samples taken from the formation may be sent into a high pressure vessel provided in the laboratory by the high pressure in the sample chamber 62 and the intermediate gas chamber 54. It should be noted that the tubing is pre-charged to a predetermined pressure prior to the removal of the formation fluid sample to prevent sample outgassing during the removal process, which can distort the measured data.

Example two:

a single-phase heat preservation storage tank mechanism for sampling formation fluid while drilling comprises a plurality of single-phase heat preservation sample tanks, and the number of the sample tanks can be determined according to the number of sampling points. The left end and the right end of each independent sample tank are fixed through a flow disc and a blind insertion disc, and the left end of each independent sample tank is connected with a shunt joint to form a storage tank mechanism assembly. During the shell body was placed to storage tank mechanism package assembly, the blind jack of right-hand member leaned on end face contact with the shell body, and the left end leaned on fluid survey and drawing nipple joint to compress tightly.

The inside liquid hole that passes that is equipped with of flow divider, pass the liquid hole and be connected with sample jar alone through the runner, the fastener that flow divider was equipped with and is connected with sample jar alone simultaneously.

The fluid mapping short joint is provided with a fluid pollution rate measuring device, and a main formation fluid transmission pipeline is arranged inside the fluid mapping short joint and is connected to a shunt joint of the storage tank mechanism. And an electric control reversing valve is arranged on the main pipeline to control the pumped formation fluid to be discharged to the shaft annulus or a flow dividing joint. The main pipeline of the shunt joint is connected to each sample tank through branch pipelines, and the number of the branch pipelines is the same as that of the sample tanks.

The flow-through discs and blind-insert discs have a plurality of semi-circular or circular flow passages through which drilling fluid can be delivered to the drilling tool below.

The single-phase heat preservation sample tank consists of a cylinder barrel, a cylinder end plug, two free pistons and a communicating pipe. The bore is divided into three variable chambers by two free pistons. The sample chamber is in fluid communication with the formation through the bore and primarily stores the pumped virgin formation fluid. The gas chamber can be filled with high-pressure inert gas to perform air cushion pressurization operation. The mud chamber is in communication with the wellbore annulus drilling fluid by communication tubing and allows free flow of drilling fluid between the mud chamber and the wellbore.

When high-pressure inert gas is injected into the gas chamber, the two pistons move towards two opposite ends, the left piston moves to the piston retaining ring and is limited by the end face of the retaining ring, and the right piston moves towards the opposite direction and is limited by the inner wall of the right end of the cylinder barrel.

When the formation hydrostatic column pressure is greater than the injected gas pressure, wellbore fluid flows into the mud chamber and the right piston compresses the gas chamber.

The cylinder end plug is provided with an electric control three-way valve, the sucked formation fluid is firstly discharged to the outside of the tool through the three-way valve, the pre-injected fluid in the pipeline is discharged, then the three-way valve is closed, and the sucked formation fluid is injected into the sample chamber.

After the sample chamber is injected with formation fluid, the left piston moves rightwards to compress the middle gas chamber, the right piston moves to the inner wall of the right end of the cylinder body, and well bore fluid is discharged into the well bore through the flow guide pipe.

The sample tank body is designed to be hollow, and liquid expansion heat insulation materials or heat insulation foaming materials are injected through the filling hole, so that the heat insulation effect is achieved.

The sample tank body can be not designed to be hollow, and thermal insulation coatings are distributed and sprayed inside and outside the sample tank body to play a role in heat preservation.

The cylinder end plug is provided with a connecting hole which can be connected and fastened to the shunt joint to fix the sample tank.

The cylinder end plug is provided with 2 main fluid flow channels, the channel 1 is connected with the shaft annulus and is communicated with the mud chamber through a communicating pipe, and a valve is not arranged in the middle of the channel, so that drilling fluid in the annulus and the mud chamber can freely flow according to the movement condition of the piston. The sample cavity is connected to 2 one ends of passageway, and the other end has 3 different valves, and the upper portion valve can control the formation fluid of infusing and sucking, and the left end valve inserts the hard tube of aerifing after can tearing open, and the hard tube inserts left piston gas injection mouth, can pour into high-pressure gas into. The lower valve is a quick connect coupling that connects the formation fluid in the sample chamber to a laboratory storage container.

The left piston is provided with 2 valve holes, an air injection valve is arranged on each valve hole, high-pressure inert gas is injected, a needle valve is arranged on each valve hole, and high-pressure gas in a gas cavity can be discharged after operation is finished.

The communicating pipe is a piston rod of two pistons, and the middle pore passage is used as a communicating channel of annular fluid and a slurry chamber and is connected through a right circular or elliptical hole.

The sample chamber communicating pipe is sleeved with a baffle ring, the left end of the baffle ring and the end face of the cylinder end plug are limited, and the right end of the baffle ring is used for limiting the left piston. The outer diameter of the baffle ring is smaller than the inner diameters of the installation positions of the air injection valve and the needle valve which are installed on the left piston, so that the two valves of the left piston are protected from contacting the end face of the cylinder end plug.

Example three:

a single-phase heat-preservation storage tank mechanism for sampling formation fluid while drilling is characterized in that a plurality of single-phase heat-preservation sample tanks are inserted into blind jacks and a splitter disc and are fixed, the single-phase heat-preservation sample tanks and a splitter joint are assembled into an assembly state and are placed in an outer shell, and the right end face of each blind jack is limited by the inner wall of the outer shell. The shunt joint is inserted into the fluid mapping nipple and is limited by the right end face of the mapping nipple.

The flow passing disc and the blind insertion disc are provided with jacks with the same number as the sample tanks, the jacks can be inserted into the sample tanks, and meanwhile, a plurality of semicircular or circular flow channels are arranged, so that drilling fluid can be transmitted to a drilling tool below through the flow channels.

The formation fluid sampling while drilling tool draws fluid from the formation and first performs a contamination rate analysis through the fluid mapping sub, with the unacceptable sample being discharged into the wellbore annulus until the acceptable sample is collected. An electric control valve for controlling the flow direction of formation fluid is arranged in the mapping nipple, and the flow direction of the analyzed fluid to a well bore or a sample tank can be controlled.

The shunt joint has hydraulic line and survey and drawing nipple joint to the reposition of redundant personnel becomes several lateral conduit, and the lateral conduit passes the liquid hole through inside and is connected with sample jar alone, and the quantity of lateral conduit is the same with the quantity of sample jar, and the shunt joint is equipped with the fastener of being connected with sample jar alone simultaneously.

The single-phase heat preservation sample tank disclosed by the utility model consists of a cylinder barrel, a cylinder end plug, two free pistons and a communicating pipe. The sample tank is fixed through a shunt joint, a shunt disk and a blind jack to form a storage tank mechanism. The cylinder barrel and the cylinder end plug are connected through threads and are provided with sealing elements, a hollow communicating pipe is arranged in the middle of the sealing elements and serves as a piston rod, and the two free pistons are located between the cylinder barrel and the communicating pipe and are respectively provided with seals. The bore is divided into three variable chambers by two free pistons. The sample chamber is in fluid communication with the formation through the bore and primarily stores the pumped virgin formation fluid. The gas chamber can be filled with high-pressure inert gas to perform air cushion pressurization operation. The mud chamber is in communication with the wellbore annulus drilling fluid via a communication tube and allows free flow of drilling fluid between the mud chamber and the wellbore.

One end of the communicating pipe is inserted into the cylinder end plug and sealed by the O ring, the other end of the communicating pipe is contacted with the inner wall of the cylinder barrel, and one side of the cylinder barrel, which is contacted with the cylinder barrel, is provided with a connecting hole which is connected with the slurry chamber.

The cylinder end plug is provided with 2 communicating pore channels, the channel 1 is connected with the shaft annulus and is communicated with the slurry chamber through a communicating pipe, and a valve is not arranged in the middle of the communicating pipe, so that drilling fluid in the annulus and the slurry chamber can freely flow according to the movement condition of the piston. The channel 2 is connected with a formation fluid chamber at the left end, meanwhile, the channel 2 is provided with three fluid inlets, one inlet is provided with an electric control three-way valve for controlling the formation fluid to be injected into the sample chamber, one inlet can inject high-pressure inert gas into the gas chamber, and the other inlet can transport the formation fluid outwards.

The cylinder end plug is provided with a connecting hole which can be connected and fastened to the shunt joint to fix the sample tank.

The sample tank body is designed to be hollow, and liquid expansion heat insulation materials or heat insulation foaming materials are injected through the filling hole, so that the heat insulation effect is achieved.

The sample tank body also can be not designed to be hollow, and thermal insulation coatings are sprayed on the inner wall and the outer wall of the tank body to play a role in heat preservation.

The left piston is provided with 2 valve holes, an air injection valve is arranged on each valve hole, high-pressure inert gas is injected, a needle valve is arranged on each valve hole, and high-pressure gas in a gas cavity can be discharged after operation is finished.

The sample chamber communicating pipe is sleeved with a baffle ring, the left end of the baffle ring and the end face of the cylinder end plug are limited, and the right end of the baffle ring is used for limiting the left piston. The outer diameter of the baffle ring is smaller than the inner diameters of the installation positions of the air injection valve and the needle valve which are installed on the left piston, so that the two valves of the left piston are protected from contacting the end face of the cylinder end plug.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A single-phase heat preservation storage tank mechanism for sampling formation fluid while drilling comprises a mapping short section and an outer shell which are sequentially connected, and is characterized in that a plurality of sample tanks which are arranged in an annular array are arranged in the outer shell, one ends of the sample tanks are connected with shunt joints, and the shunt joints are inserted into the mapping short section; be equipped with a plurality of reposition of redundant personnel passageways that correspond with sample tank quantity in the reposition of redundant personnel connects, sample tank and the reposition of redundant personnel passageway intercommunication that corresponds.

2. The formation fluid sampling while drilling single-phase insulation storage tank mechanism as recited in claim 1, wherein the waist portions of the plurality of sample tanks are inserted into the diverter tray, and the other ends of the plurality of sample tanks are inserted into the blind jacks; the shunt plate is provided with through holes which are in one-to-one correspondence with the sample tanks, and the blind jacks are blind holes which are in one-to-one correspondence with the sample tanks and are arranged at one end of the outer shell; the flow distribution disc and the blind insertion hole are provided with a hollow flow passage and an annular flow passage; the excircle of flow distribution plate contacts with the inner wall of the outer shell.

3. The while-drilling formation fluid sampling single-phase insulation storage tank mechanism as claimed in claim 2, wherein the hollow flow channel is circular, and the annular flow channel is a plurality of semicircular flow channels.

4. The formation fluid sampling while drilling single-phase insulation storage tank mechanism as recited in claim 1, 2 or 3, wherein the sample tank comprises a cylinder end plug and a cylinder body which are connected in sequence;

the cylinder end plug is internally provided with a three-way pore passage, a drilling fluid pore passage and a stratum fluid pore passage, a communicating pipe is fixedly arranged in the middle of the cylinder body, a left piston and a right piston are slidably sleeved on the communicating pipe, and the left piston and the right piston divide the space in the cylinder body into a gas chamber, a sample chamber and a slurry chamber from left to right in sequence;

one end of the three-way pore canal is communicated with the gas cavity, one end of the three-way pore canal is provided with an electromagnetic three-way valve, and the other end of the three-way valve is provided with a plug;

the drilling fluid pore passage is communicated with the communicating pipe, and the other end of the communicating pipe is communicated with the slurry chamber;

a baffle ring is arranged between the right end surface of the cylinder end plug and the left end surface of the left piston;

the left piston is provided with 2 valve holes, 1 valve hole is provided with an air injection valve, and 1 valve hole is provided with a needle valve.

5. The single-phase insulation while drilling storage tank mechanism for sampling formation fluid as recited in claim 4, wherein a discharge valve is further arranged in the cylinder end plug, and the discharge valve is communicated with the three-way pore passage.

6. The mechanism of claim 4, wherein a small hole is formed in a side wall of the other end of the communicating pipe, and the communicating pipe is communicated with the mud chamber through the small hole.

7. The single-phase insulation while drilling storage tank mechanism for sampling formation fluid as recited in claim 4, wherein a space surrounding the entire cylinder is provided in the wall of the cylinder, and the space is filled with a heat insulating material.

8. The mechanism of the single-phase heat preservation storage tank for formation fluid sampling while drilling as recited in claim 7, wherein a filling hole is formed outside the cylinder body, and the filling hole is communicated with the spacing space.

9. The single-phase while drilling formation fluid sampling insulation storage tank mechanism as recited in claim 8, wherein the insulation material is a liquid expansion insulation material.

10. The single-phase insulation while drilling storage tank mechanism for sampling formation fluid as recited in claim 4, wherein the inner and outer walls of the cylinder body are coated with thermal insulation coatings.

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