CN108827824B - Method for measuring density of gas-containing liquid - Google Patents
Method for measuring density of gas-containing liquid Download PDFInfo
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- CN108827824B CN108827824B CN201810557536.1A CN201810557536A CN108827824B CN 108827824 B CN108827824 B CN 108827824B CN 201810557536 A CN201810557536 A CN 201810557536A CN 108827824 B CN108827824 B CN 108827824B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N9/04—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of fluids
Abstract
The invention relates to a method for measuring the density of a gas-containing liquid. The technical scheme is as follows: including buncher, toper whirl chamber, contain gas measuring device and degasification measuring device, the upside in toper whirl chamber pass through the pipe connection and contain gas measuring device, the downside passes through the pipe connection degasification measuring device, it is equipped with first weighing device on the gas measuring device to contain, the top in toper whirl chamber is equipped with buncher and exhaust hole, is equipped with the second weighing device on the degasification measuring device. The beneficial effects are that: under the condition with the atmosphere intercommunication, carry out real-time accurate measurement to the drilling fluid density before and after the degasification, the whirl effect and the impeller rotation of make full use of fluid self realize the fluid degasification in the middle of two measuring device, access & exit position design and high-speed impeller homoenergetic ensure that measured liquid is for just returning the drilling fluid in the well, this device simple structure, the processing of being convenient for compares with current density measurement device, has small, measures characteristics such as real-time, accurate, sparingly manpower.
Description
Technical Field
The invention relates to the related field of petroleum engineering, in particular to a method for measuring the density of gas-containing liquid.
Background
The device for immediately measuring different densities of the gas-containing liquid returned from the oil-gas well before and after degassing has important significance for the well control safety of drilling in a target layer, so that the density condition and the hydrostatic column pressure of the drilling fluid in the well can be mastered at any time, the density reduction condition of the drilling fluid after gas mixing and the reason (except for mixed gas, whether other stratum liquid is mixed into a circulating system or not) causing the density reduction are determined, and a basis is provided for the adjustment of subsequent drilling fluid. Traditionally, measurements have been made by devices that can only measure one density; during actual operation, the most accurate measurement mode is that workers firstly use the densimeter to measure the density of drilling fluid returned from the well in a three-removal area before degassing, and then use the degassing densimeter to measure the density after degassing, and only one density can be measured each time and continuous real-time measurement cannot be carried out. According to the requirements of field operation, the gas-containing liquid is degassed through the special device, the density of the liquid is measured before and after degassing, the effect of continuously measuring two densities can be achieved, the effect of a manufactured test prototype is also tested, verified and analyzed, and the density monitoring of the drilling fluid in the gas-containing oil-gas well is of great significance.
The drilling fluid density measuring device is widely used in drilling operation in the related field of petroleum engineering. In the drilling operation, the hydrostatic column pressure of the drilling fluid is utilized to balance the underground formation pressure, and after fluids such as oil, gas, water and the like in the formation enter a drilling fluid system, the density of the drilling fluid is inevitably reduced, so that the pressure in the well is unbalanced, and accidents such as well kick, blowout and the like occur. The traditional manual measurement method is time-consuming and labor-consuming, and other continuous density measurement devices can only measure one density and cannot accurately master the condition of formation fluid mixed in drilling fluid.
From the published literature reports and practical applications, no report has been made so far on the research and application of the instant measurement of the density of the gas-containing liquid before and after degassing based on the above idea. The research fully exerts subjective motility on the basis of strictly following basic objective rules, explores according to the existing theory and application, and opens up a new application field of the cyclone device in the aspect of density measurement.
Disclosure of Invention
The invention aims to provide a method for measuring the density of gas-containing liquid aiming at the defects in the prior art, so that the density of drilling fluid returning from an oil-gas well and the density of drilling fluid after degassing are measured in real time under the condition that formation fluid is unknown.
The invention provides a device for instantly measuring the density of gas-containing liquid before and after degassing, which adopts the technical scheme that: the device comprises a speed regulating motor (a 5), a conical rotational flow cavity (a 7), a gas containing measuring device (a 14) and a degassing measuring device (a 15), wherein the upper side of the conical rotational flow cavity (a 7) is connected with the gas containing measuring device (a 14) through a pipeline, the lower side of the conical rotational flow cavity (a 7) is connected with the degassing measuring device (a 15) through a pipeline, a first gas containing fluid inlet (a 1), a first weighing device (a 2) and a first overflow port (a 3) are arranged on the gas containing measuring device (a 14), the first weighing device (a 2) is arranged at the bottom of the gas containing measuring device (a 14), and the first overflow port (a 3) is arranged at the middle upper part of the gas containing measuring device (a 14); the top of the conical rotational flow cavity (a 7) is provided with a speed regulating motor (a 5) and an exhaust hole (a 6), and the speed regulating motor (a 5) drives an impeller (a 9) of the inner cavity of the conical rotational flow cavity (a 7) to rotate; the degassing measurement device (a 15) is provided with a degassing fluid inlet (a 11), a third overflow port (a 12) and a second weighing device (a 13), the second weighing device (a 13) is arranged at the bottom of the degassing measurement device (a 15), and the third overflow port (a 12) is arranged at the middle upper part of the degassing measurement device (a 15).
Spiral flow channels (a 8) are distributed on the inner wall of the conical swirling flow cavity (a 7), and the impeller (a 9) is provided with an inclined angle.
The middle lower part of the conical cyclone cavity (a 7) is provided with a second overflow port (a 10), and the pipeline is connected to a degassing fluid inlet (a 11) of a degassing measurement device (a 15) through the second overflow port (a 10).
The middle upper part of the conical cyclone cavity (a 7) is provided with a second gas-containing fluid inlet (a 4), and a pipeline is connected to a first overflow port (a 3) of a gas-containing measuring device (a 14) through the second gas-containing fluid inlet (a 4).
The invention provides a measuring method of a device for instantly measuring density of gas-containing liquid before and after degassing, which comprises the following steps:
the method comprises the following steps that (A) a mixture containing rock debris, gas, formation water and the like returned from the underground of an oil-gas well reaches a mud outlet groove (2) through a well head (1), drilling fluid is filtered at a filter screen (3) through a centrifugal pump (4), the flowing state of the drilling fluid can be visually observed through a pressure gauge (5), the flow rate and the flowing speed of the liquid entering the whole device are controlled by adjusting a stop valve (6), and a pipeline from the stop valve (6) is connected with a gas-containing fluid inlet (a 1) of a measuring device and is subjected to sealing treatment; a second overflow port (a 12) is connected to the pipeline and discharges the measured drilling fluid to a mud pit (9); three overflow ports in the measuring device are wide enough to ensure that liquid can flow to a lower position immediately after overflowing so as to prevent the liquid level in the three containers from being higher than the overflow ports to cause inaccurate measurement; other unmeasured drilling fluids flow to a third removing device (8) through a mud pipeline to be subjected to mud removing, sand removing and degassing and then return to a mud pool (9), and the device is connected with the pipeline;
(II) carrying out a test: firstly, opening a centrifugal pump (4), closing a stop valve to carry out pressure test operation until a pressure gauge (5) reads, slowly opening the stop valve (6), when fluid flows into a device a, ensuring that the pressure gauge (5) continues to have pressure, indicating that the whole device is normal in operation, when drilling fluid flows out from a second overflow port (a 12), indicating that the whole device is filled with the drilling fluid, wherein numerical values obtained by a first weighing device (a 2) and a second weighing device (a 13) are the real-time density of the drilling fluid; in the measuring process, the whole device is adjusted and controlled by adjusting the stop valve (6), so that a satisfactory measuring effect is achieved;
and (III) after the test is finished, closing the centrifugal pump, removing the front and rear pipelines, cleaning the device by using fresh water, and airing for reuse.
The invention has the beneficial effects that: under the condition with the atmosphere intercommunication, carry out real-time accurate measurement to the drilling fluid density before and after the degasification, the whirl effect and the impeller rotation of make full use of fluid self realize the fluid degasification in the middle of two measuring device, access & exit position design and high-speed impeller homoenergetic ensure that measured liquid is for just returning the drilling fluid in the well, this device simple structure, the processing of being convenient for compares with current density measurement device, has small, measures characteristics such as real-time, accurate, sparingly manpower.
Drawings
FIG. 1 is a schematic diagram of the structure of the measuring device of the present invention;
FIG. 2 is a schematic structural view of the impeller of FIG. 1;
FIG. 3 is a flow chart of an embodiment of the present invention;
in the upper diagram: the device comprises a first gas-containing fluid inlet a1, a first weighing device a2, a first overflow port a3, a second gas-containing fluid inlet a4, a speed regulating motor a5, an exhaust hole a6, a conical swirling cavity a7, a spiral flow channel a8, an impeller a9, a second overflow port a10, a degassing fluid inlet a11, a third overflow port a12, a second weighing device a13, a gas-containing measuring device a14 and a degassing measuring device a 15;
the device comprises a wellhead 1, a slurry outlet groove 2, a filter screen 3, a centrifugal pump 4, a pressure gauge 5, a stop valve 6, a measuring device 7, a three-removing device 8, a slurry pool 9, a device a, a device b and a device c.
Detailed Description
The invention will be further described with reference to the accompanying figures 1 to 3:
the invention provides a device for instantly measuring the density of gas-containing liquid before and after degassing, which adopts the technical scheme that: the device comprises a speed regulating motor a5, a conical rotational flow cavity a7, a gas-containing measuring device a14 and a degassing measuring device a15, wherein the upper side of the conical rotational flow cavity a7 is connected with the gas-containing measuring device a14 through a pipeline, the lower side of the conical rotational flow cavity a7 is connected with the degassing measuring device a15 through a pipeline, a first gas-containing fluid inlet a1, a first weighing device a2 and a first overflow port a3 are arranged on the gas-containing measuring device a14, a first weighing device a2 is arranged at the bottom of the gas-containing measuring device a14, and a first overflow port a3 is arranged at the middle upper part of the gas-containing measuring device a 14; the top of the conical rotational flow cavity a7 is provided with a speed regulating motor a5 and an air outlet hole a6, and the speed regulating motor a5 drives an impeller a9 of the inner cavity of the conical rotational flow cavity a7 to rotate; the degassing measurement device a15 is provided with a degassing fluid inlet a11, a third overflow port a12 and a second weighing device a13, the second weighing device a13 is arranged at the bottom of the degassing measurement device a15, and the third overflow port a12 is arranged at the middle upper part of the degassing measurement device a 15.
The inner wall of the conical swirling cavity a7 is distributed with a spiral flow channel a8, and the impeller a9 is provided with an inclination angle.
The middle lower part of the conical cyclone chamber a7 is provided with a second overflow port a10, and the pipeline is connected to a degassing fluid inlet a11 of a degassing measurement device a15 through a second overflow port a 10.
The middle upper part of the conical cyclone chamber a7 is provided with a second gas-containing fluid inlet a4, and a pipeline is connected to a first overflow port a3 of a gas-containing measuring device a14 through a second gas-containing fluid inlet a 4.
The invention utilizes the traditional cyclone theory and the application thereof, improves the cyclone principle according to the actual operation requirement on the basis of the traditional design principle, has the effect of real-time and accurate measurement, achieves the aim of simultaneously measuring two densities, and designs the device parameters and the process parameters.
The existing density testing device in the fields of petroleum engineering and the like does not have an instant accurate measuring device which can simultaneously carry out degassing and two kinds of drilling fluid density, and workers respectively measure the density through a hydrometer when in actual need, the interval is about 5 minutes every time, real-time judgment of underground conditions and timely treatment of follow-up operation cannot be achieved, and great well control risks exist. The device of the present invention solves the above problems well.
The present invention is designed to achieve the above object. The main body of the test device is a conical rotational flow cavity and a weighing device. The fluid enters the vortex cavity through the overflow port after being measured at the front part, bubbles in the fluid are moved to the surface and broken under the high-speed rotation of the impeller through high-speed vortex degassing, and then the degassed drilling fluid overflows into a rear weighing device for secondary measurement.
The height of the pipe in front of the cyclone cavity can ensure that the fluid entering the cyclone cavity has a certain initial speed, degassing is carried out in high-speed cyclone, and the desorbed gas is discharged from a gas discharge hole above the cyclone cavity. The front weighing device and the rear weighing device are communicated with the atmosphere, so that the measuring accuracy is ensured. The high-speed rotating impeller has an angle alpha, plays an important role in ensuring the removal and the breakage of liquid bubbles in the cavity and the sufficient mixing of the drilling fluid, and ensures that the latest drilling fluid density is measured secondarily. The drilling fluid inlet of the weighing device is arranged below, the drilling fluid in the device can be guaranteed to be the latest drilling fluid by the design that the outlet is arranged above, the height from the bottom plate of the lower part to the overflow port is fixed, the area of the bottom plate is also fixed, and the liquid density can be obtained according to the weight weighed by the weighing device. The overflow ports in the design are all larger, and have larger downward inclination angles, so that after the liquid level of the fluid in the weighing device reaches the position of the overflow port, redundant fluid can rapidly flow to the rear through the overflow port, and the liquid level in the device is prevented from continuously rising to influence the measurement precision. The gas discharge hole is reserved with a quick connection joint, and gas can be led to a gas measuring device or a safe place for discharge by connecting a pipeline according to needs. The design of the round chassis at the bottom of the weighing part ensures that the measuring result can not be influenced by mud cakes on the inner wall of the container, and the accurate drilling fluid density can be obtained.
The invention provides a measuring method of a device for instantly measuring density of gas-containing liquid before and after degassing, which comprises the following steps:
the method comprises the following steps that (I), a mixture containing rock debris, gas, formation water and the like returned from the underground of an oil-gas well reaches a mud outlet groove 2 through a wellhead 1, drilling fluid is filtered at a filter screen 3 through a centrifugal pump 4, the flowing state of the drilling fluid can be visually observed through a pressure gauge 5, the flow rate and the flowing speed of liquid entering the whole device are controlled through adjusting a stop valve 6, and a pipeline from the stop valve 6 is connected with a gas-containing fluid inlet a1 of a measuring device and is sealed; a second overflow port a12 is connected to the pipeline and discharges the measured drilling fluid to the mud pit 9; three overflow ports in the measuring device are wide enough to ensure that liquid can flow to a lower position immediately after overflowing so as to prevent the liquid level in the three containers from being higher than the overflow ports to cause inaccurate measurement; other unmeasured drilling fluids flow to a third removing device 8 through a mud pipeline to be subjected to mud removing, sand removing and degassing and then return to a mud pool 9, and the device is connected with the pipeline;
(II) carrying out a test: firstly, opening a centrifugal pump 4 and closing a stop valve to carry out pressure test operation until a reading is given by a pressure gauge 5, slowly opening the stop valve 6, when fluid flows into a device a and pressure of the pressure gauge 5 is ensured to be kept, the normal operation condition in the whole device is shown, when drilling fluid flows out from a second overflow port a12, the whole device is shown to be filled with the drilling fluid, and the numerical values obtained by a first weighing device a2 and a second weighing device a13 are the real-time density of the drilling fluid; in the measuring process, the whole device is adjusted and controlled by adjusting the stop valve 6, so that a satisfactory measuring effect is achieved;
and (III) after the test is finished, closing the centrifugal pump, removing the front and rear pipelines, cleaning the device by using fresh water, and airing for reuse.
The measuring device provided by the invention has the following remarkable characteristics:
(1) the liquid density is directly measured by the device, so that the labor intensity of manual measurement is reduced;
(2) the measured liquid is the drilling fluid returned from the underground in real time, so that the liquid density can be measured in real time;
(3) the different densities of the drilling fluid before and after degassing can be measured simultaneously, and the pressure state under the well can be grasped visually;
(4) the design of the round bottom plate at the bottom of the weighing part ensures that the measuring result can not be influenced by mud cakes on the inner wall of the container and is only directly related to the density of the drilling fluid.
(5) The device has simple structure, few parts, convenient assembly and disassembly in actual production and strong mobility;
(6) the inner structure design is matched well, and the measuring result is accurate.
In addition, it should be noted that: the design utilizes a rapid and efficient centrifugal force field separation and high-speed stirring device to generate a great speed gradient to degas the gas-containing drilling fluid, promotes the bubbles to break and separate while increasing the surface area of the liquid by forming a high-speed thin layer, and then utilizes the comprehensive action of centrifugal force and gravity to discharge and degas the gas in the drilling fluid; and simultaneously, the drilling fluid is respectively subjected to accurate density measurement before and after degassing.
The invention has reasonable design, can generate a centrifugal force field which is more than a gravity field by hundreds or even thousands, and has huge shearing stress and velocity gradient, so that the centrifugal force field has multiple separation functions of concentration, classification, sorting and the like. The characteristic of gas-liquid separation of the cyclone is utilized, the requirement of real-time measurement is considered, the traditional cyclone is improved, and a new design is carried out on the structural size and the configuration relation of the whole device. The rotating impeller at the bottom of the cyclone can ensure that the density of the drilling fluid which is just returned from the well and subjected to degassing is measured at the device c; because the liquid of the cyclone which enters generally has a certain pressure, if a traditional centrifugal pump pressurization mode is used, the density of the gas-containing drilling fluid can be influenced, namely the density can be increased, the drilling fluid measured at the device a is communicated with the atmosphere in the design, the adverse influence is eliminated, and the pressure difference required by the cyclone is generated by the height difference between the overflow port at the device a and the inlet at the device b. Meanwhile, the structural design of bottom inlet and top outlet at the positions of the device a and the device c can ensure the liquid level height in the container, and can also ensure that the previous drilling fluid can be extruded while the new drilling fluid enters, so that the weighing device measures the weight of the drilling fluid in real time, and the density can be obtained in real time due to the fixed volume, the fixed liquid level height and the fixed density; due to the design that the bottom of the weighing device is not fixed with the side wall of the container, the measurement result is not influenced by sundries such as mud cakes attached to the inner wall of the container.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (1)
1. A method of measuring the density of a gas-containing liquid, comprising the steps of:
the method comprises the following steps that (I), a mixture containing rock debris, gas and formation water and returned from the underground of an oil-gas well reaches a mud outlet groove (2) through a wellhead (1), drilling fluid is filtered at a filter screen (3) through a centrifugal pump (4), the flowing state of the drilling fluid can be visually observed through a pressure gauge (5), the flow rate and the flowing speed of liquid entering the whole device are controlled by adjusting a stop valve (6), and a pipeline from the stop valve (6) is connected with a gas-containing fluid inlet (a 1) of a device a and is subjected to sealing treatment; the second overflow port (a 12) is connected with a drain pipe and discharges the measured drilling fluid to a mud pit (9); three overflow ports in the device a, the device b and the device c are wide enough to ensure that the liquid can flow to a lower position immediately after overflowing so as to prevent the liquid level in the device a, the device b and the device c from being higher than the overflow ports to cause inaccurate measurement; other unmeasured drilling fluids flow to a third removing device (8) through a mud pipeline to be subjected to mud removing, sand removing and degassing and then return to a mud pool (9), and the third removing device (8) is connected with the pipeline to finish the operation;
(II) carrying out a test: firstly, opening a centrifugal pump (4), closing a stop valve to carry out pressure test operation until a pressure gauge (5) reads, slowly opening the stop valve (6), when fluid flows into a device a, ensuring that the pressure gauge (5) continues to have pressure, indicating that the whole device is normal in operation, when drilling fluid flows out from a second overflow port (a 12), indicating that the whole device is filled with the drilling fluid, arranging a first weighing device (a 2) at the bottom of a gas-containing measuring device (a 14), arranging a second weighing device (a 13) at the bottom of a degassing measuring device (a 15), wherein the values obtained by the first weighing device (a 2) and the second weighing device (a 13) are the real-time density of the drilling fluid; in the measuring process, the whole device is adjusted and controlled by adjusting the stop valve (6), so that a satisfactory measuring effect is achieved;
after the test is finished, closing the centrifugal pump, removing front and rear pipelines, cleaning the device by using fresh water, and airing for reuse;
in the step (II), the drilling fluid enters a conical cyclone cavity (a 7) through a first overflow port (a 3) after being measured by a gas-containing measuring device (a 14) at the front part, bubbles in the fluid are moved to the surface and broken under the high-speed rotation of an impeller (a 9) through high-speed cyclone degassing, and then the degassed drilling fluid overflows into a second weighing device (a 13) at the rear part for secondary measurement;
the whole device comprises a device a, a device b and a device c, wherein the device a is connected with the device b, the device b is connected with the device c,
said device a comprising a first gas-containing fluid inlet (a 1), a first weighing device (a 2), a first overflow (a 3), a gas-containing measuring device (a 14),
the device b comprises a second gas-containing fluid inlet (a 4), a speed regulating motor (a 5), an exhaust hole (a 6), a conical swirling cavity (a 7), a spiral flow channel (a 8), an impeller (a 9) and a second overflow port (a 10),
the device c comprises a degassing fluid inlet (a 11), a third overflow (a 12), a second weighing device (a 13), a degassing measurement device (a 15).
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| CN201810557536.1A CN108827824B (en) | 2016-06-24 | 2016-06-24 | Method for measuring density of gas-containing liquid |
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| CN201810557536.1A CN108827824B (en) | 2016-06-24 | 2016-06-24 | Method for measuring density of gas-containing liquid |
| CN201610471078.0A CN106053291B (en) | 2016-06-24 | 2016-06-24 | It is a kind of it is instant measure air containing fluid degasification before and after density device |
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| CN108425649B (en) * | 2018-03-28 | 2019-06-14 | 中国石油大学(北京) | Drilling fluid density is segmented regulation device |
| CN110220819A (en) * | 2019-06-11 | 2019-09-10 | 太原理工大学 | A method of based on tuning fork densimeter measurement direct flotation feed thickness |
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| CN106053291A (en) | 2016-10-26 |
| CN106053291B (en) | 2018-10-19 |
| CN108827824A (en) | 2018-11-16 |
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