CN112082620A - Automatic measuring device for drilling fluid filtration loss - Google Patents
Automatic measuring device for drilling fluid filtration loss Download PDFInfo
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- CN112082620A CN112082620A CN201910511468.XA CN201910511468A CN112082620A CN 112082620 A CN112082620 A CN 112082620A CN 201910511468 A CN201910511468 A CN 201910511468A CN 112082620 A CN112082620 A CN 112082620A
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- 238000001914 filtration Methods 0.000 title claims abstract description 46
- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 239000012530 fluid Substances 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000706 filtrate Substances 0.000 claims abstract description 33
- 238000011010 flushing procedure Methods 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 229910000278 bentonite Inorganic materials 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to an automatic measuring device for drilling fluid filtration loss, which comprises a filtration loss main body, a filter medium, a filtrate measuring system and a flushing system, wherein the filtration loss main body is provided with a filter medium inlet and a filtrate measuring system; the fluid loss main body comprises a closed piston chamber cylinder and a piston, a pressure interface, an exhaust hole, a discharge interface, a clean water pump interface and an emptying interface are arranged on the piston chamber cylinder, and a filter medium is arranged above the discharge interface at the bottom of the piston chamber cylinder; the filtrate measuring system comprises a displacement sensor and a mass meter; the flushing system comprises an ultrasonic generator, a pressure valve, a pressure regulating valve, a pressure gauge, an air source pressure gauge and a gas transmission pipeline, a high-pressure air source, a piston reset valve, a mud pump, a clean water valve, a clean water pump, a pressure sensor, a blow-down valve, a filtrate valve and a recoil valve. The device can realize the functions of automatic pressurization of the drilling fluid filtration loss automatic measuring instrument, continuous timing recording of the measured filtration loss and automatic cleaning.
Description
Technical Field
The invention relates to a device for measuring the filtration loss of related liquid in the petroleum development process, in particular to a device for automatically measuring the filtration loss of drilling fluid.
Background
The drilling fluid filtration loss is an important performance parameter of the drilling fluid, and currently, in the conventional drilling operation, the method for measuring the filtration loss is mainly to perform a low-temperature and low-pressure experiment by using a filtration loss instrument to obtain the API filtration loss. The method ensures that the components of the drilling fluid cup, especially the filter screen, are clean and dry, and also ensures that the sealing gasket is not deformed or damaged. During testing, the drilling fluid is injected into the drilling fluid cup, the liquid level of the drilling fluid cup is at least 13mm away from the top (so as to reduce the pollution of carbon dioxide to the filtrate), and then the filter paper is placed and the instrument is installed. A dry graduated cylinder was placed under the discharge tube to receive the filtrate. The pressure reducing valve is closed and the pressure regulator is adjusted to achieve a pressure of 690 + -35 KPa in 30 seconds or less. The time was started while pressurizing, and the volume of the filtrate was measured after 30 min. The pressure regulator was closed and the pressure relief valve was carefully opened. In cm3The volume of the filtrate was recorded in units (to the nearest 0.1 cm)3) The result was taken as the API filtrate loss. From the aboveAs can be seen, the conventional method requires a large sample size (about 300 cm to fill the sample cup)3) It takes a long time (at least 30min for the experimental process) and has many operation steps.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a novel automatic measuring device for drilling fluid filtration loss, which can measure the filtration loss of drilling fluid timely and accurately, solve the problem of automatic online monitoring of the filtration loss of drilling fluid and provide favorable technical support for automatic drilling.
The technical proposal is that the method comprises the following steps,
an automatic measuring device for drilling fluid filtration loss comprises a filtration loss main body, a filter medium, a filtrate measuring system and a flushing system;
the fluid loss body includes: the piston is axially arranged in the piston chamber cylinder, a convex bolt which is in sliding seal fit with the top of the piston chamber cylinder in the axial direction is arranged at the top of the piston, a pressure interface which is communicated with the upper seal chamber of the piston is arranged at the upper part of the piston chamber cylinder, an exhaust hole which is communicated with the lower seal chamber of the piston is arranged at the middle part of the piston chamber cylinder, a discharge interface is axially arranged at the bottom of the piston chamber cylinder, a clean water pump interface and an emptying interface are respectively arranged in the radial direction, and a filter medium is arranged above the discharge interface at the bottom of the piston chamber cylinder;
the filter medium comprises filter paper or a metal plate and a metal filter screen which are uniformly provided with filter holes;
the filtrate amount measuring system includes: a displacement sensor arranged on a convex bolt at the top of the piston and a mass meter connected with the discharge interface;
the flushing system comprises an ultrasonic generator arranged in a piston, a pressurizing valve, a pressure gauge, a pressure regulating valve, an air source pressure gauge, an air conveying pipeline and a high-pressure air source which are connected with a pressure interface, a piston reset valve, the air source pressure gauge and the air conveying pipeline which are connected with an exhaust hole, a mud valve, a mud pump, a clean water valve and a clean water pump which are connected with a clean water pump interface, a pressure sensor, a blow-down valve and an emptying pipeline which are connected with an emptying interface, and a filtrate valve, a recoil valve and a clean water pump which are connected with an exhaust interface.
The above scheme further comprises:
the piston reset valve, the pressure regulating valve, the drain valve, the filtrate valve, the backflushing valve, the clean water valve and the slurry valve are all electromagnetic valves; the flushing system also comprises a controller, wherein the controller is respectively connected and controlled with the piston reset valve, the pressurizing valve, the pressure regulating valve, the blow-down valve, the filtrate valve, the backflushing valve, the clean water valve and the slurry valve.
The device is characterized in that other parts except a high-pressure air source, a slurry pump, a clean water pump, an emptying pipeline and a mass meter are all arranged in a box body, and the box body is respectively provided with a quick connector connected with the high-pressure air source, the slurry pump, the clean water pump and the emptying pipeline and an opening corresponding to a filtrate valve and the mass meter.
An annular pressure ring A is arranged above the filter medium A at the bottom of the piston chamber cylinder.
The high-pressure air source is a high-pressure air bottle or an air compressor.
The device of the invention adopts repeatable filter media to replace filter paper, and is matched with an ultrasonic generator to wash so as to realize repeated application of the filter media; all valves of the product adopt electromagnetic valves, and the opening and closing of the valves are automatically controlled by a computer; the device shell is sealed, and the complex conditions of heat preservation, rain prevention, explosion prevention and the like are fully considered. A displacement sensor is mounted at the top end of the fluid loss body, and filtered liquid is discharged through a bottom port. The two sides of the main body are provided with interfaces for connecting a clean water pump, a slurry pump and emptying. An ultrasonic generator washing device is arranged in the filter loss main body, so that the mud cake can be effectively washed, and the filter medium can be repeatedly used. The filtrate amount measuring system comprises a displacement sensor, and the displacement sensor is installed at the top end of the fluid loss main body and used for sensing the descending distance of a piston in the fluid loss main body and recording the fluid loss amount data. The automatic flushing system comprises a clean water pump, an ultrasonic generator device, a pressure valve, a slurry valve, a clean water valve, a filtrate valve, a drain valve and the like, which are all automatically controlled by electromagnetic valves. The flushing system injects clear water into the main body through the clear water pump, starts the ultrasonic generator and flushes the main body. While simultaneously emptying the flushing liquid.
The invention has the following effects:
the automatic measuring device for the drilling fluid filtration loss can realize the functions of automatic pressurization, continuous and timed recording and measurement of the filtration loss and automatic cleaning of the automatic measuring device for the drilling fluid filtration loss.
Drawings
FIG. 1 is a schematic diagram of an exemplary embodiment.
FIG. 2 is a schematic diagram of an online evaluation device for drilling fluid loss performance.
FIG. 3 is a graph showing the change of fluid loss with time.
In the figure: the device comprises an A1 fluid loss main body, an A2 pressure interface, an A3 ultrasonic generator, an A4 piston, an A5 clean water pump interface, an A6 filter medium, an A7 discharge interface, an A8 annular pressure ring, an A9 emptying interface, an A10 exhaust port, a1 gas pipeline A, a2 quick connector, A3 gas pipeline B, a4 controller, a5 gas source pressure gauge, a6 pressure gauge, a7 pressure regulating valve, an 8 piston reset valve, a9 pressurizing valve, a10 displacement sensor, a 11 pressure sensor, a 12 blow-off valve, a 13 emptying pipeline, a 14 filtrate valve, a 15 backflushing valve, a 16 clean water valve, a 17 mud valve, an 18 mud pump, a 19 clean water pump, a 20 case and a 21 mass meter.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the present invention is implemented as follows:
example 1: an automatic measuring device for drilling fluid filtration loss comprises a filtration loss main body A1, a filter medium A6, a filtrate measuring system and a flushing system;
the fluid loss body a1 includes: the piston is axially arranged in the piston chamber cylinder, a piston A4 is axially arranged in the piston chamber cylinder, a convex bolt which is in sliding seal fit with the top of the piston chamber cylinder in the axial direction is arranged at the top of the piston, a pressure interface A2 which is communicated with an upper sealing chamber of the piston is arranged at the upper part of the piston chamber cylinder, an exhaust hole A10 which is communicated with a lower sealing chamber of the piston is arranged at the middle of the piston chamber cylinder, a discharge interface A7 is axially arranged at the bottom of the piston chamber cylinder, a clean water pump interface A5 and a vent interface A9 are respectively arranged in the radial direction, and a filter medium A6 is arranged above a discharge interface A7 at the bottom;
the filter medium A6 comprises filter paper or a metal plate and a metal filter screen which are uniformly distributed with filter holes;
the filtrate amount measuring system includes: a displacement sensor 10 mounted on a convex bolt at the top of the piston A4 and a mass meter 21 connected with the discharge interface A7;
the flushing system comprises an ultrasonic generator A3 arranged in a piston A4, a pressurizing valve 9, a pressure gauge 6, a pressure regulating valve 7, an air source pressure gauge 5, an air conveying pipeline and a high-pressure air source which are connected with a pressure interface A2, a piston reset valve 8, the air source pressure gauge 5, the air conveying pipeline which are connected with an exhaust hole A10, a mud valve 17, a mud pump 18, a clean water valve 16, a clean water pump 19 which are connected with a clean water pump interface A5, a pressure sensor 11, a blow-down valve 12, an exhaust pipeline 13 which are connected with an exhaust interface A9, a filtrate valve 14, a recoil valve 15 and a clean water pump 19 which are connected with an exhaust interface A7.
Example 2: the above embodiment 1 further comprises:
the piston reset valve 8, the pressure valve 9, the pressure regulating valve 7, the blow-down valve 12, the filtrate valve 14, the recoil valve 15, the clean water valve 16 and the slurry valve 17 are all electromagnetic valves; the flushing system also comprises a controller 4, wherein the controller 4 is respectively connected and controlled with a piston reset valve 8, a pressurizing valve 9, a pressure regulating valve 7, a blow-down valve 12, a filtrate valve 14, a backflushing valve 15, a clean water valve 16 and a slurry valve 17.
The device is characterized in that other parts except a high-pressure air source, a mud pump 18, a clean water pump 19, a vent pipeline 13 and a mass meter 21 are all arranged in a box body 20, and the box body 20 is provided with a quick connector 2 connected with the high-pressure air source, the mud pump 18, the clean water pump 19 and the vent pipeline 13 and openings corresponding to a filtrate valve 14 to the mass meter 21.
An annular pressure ring A8 is provided above the filter medium a6 at the bottom of the piston chamber cylinder.
Example 3: the automatic measuring device for the drilling fluid filtration loss comprises a displacement sensor 10 arranged on the upper part of a filtration loss body A1, a pressure interface A2 arranged on the right upper part of the filtration loss body, a piston A4 connected below the displacement sensor 10, an ultrasonic generator A3 arranged in the piston A4, a clean water pump interface A5 and an emptying interface A9 arranged at the bottom of the filtration loss body respectively, an exhaust hole A10 arranged in the middle of the filtration loss body, a filter medium A6 and an annular pressure ring A8 arranged below the filtration loss body, and a filtrate discharge interface A7 arranged at the bottom of the filtration loss body.
The drilling fluid filtration loss test platform is realized by the following modes with reference to the attached figure 2:
the inside of the case 20 is shown in fig. 2 by a thick dashed line, and the control circuit of the controller 4 is shown by a thin dashed line. The upper part of the case 20 is provided with a quick connector 2 and a gas pipeline 1 for connecting a gas cylinder or an air compressor, the upper part of the case 20 is provided with another pipeline for connecting a computer control system, the right lower part of the case 20 is respectively provided with the quick connector 2 and the pipeline for communicating a mud pump 18 and a clean water pump 19, the left lower part is provided with an emptying pipeline 13, and the bottom of the case is provided with a discharge interface for directly discharging filtrate. The main part of the inside of the case is a filtration main body A1, the upper part of the case is provided with a displacement sensor 10, an air source pressure gauge 5, a pressure regulating valve 7, a pressure gauge 6, a pressure valve 9 and a piston reset valve 8 are connected on an air transmission pipeline 1, a pressure sensor 11 and a blow-down valve 12 which are connected with a left outlet at the lower part of the main body are connected with an air release pipeline 13, and a mud valve 17 and a clean water valve 16 which are connected with a mud pump 18 and a clean water pump 19 are respectively connected; the lower part of the main body is connected with a recoil valve 15, a clean water pump 19 and a filtrate valve 14.
Example 4: the fluid loss main body is made of stainless steel and is resistant to pressure of 1.5 MPa. The top end is provided with a displacement sensor, the stroke of the piston is 50mm, the ultrasonic generator is arranged in the piston, the bottom is provided with a filter medium for filtering impurities, and filtered liquid flows out through a bottom port. The two sides of the main body are provided with interfaces for connecting a clean water pump, a slurry pump and emptying. The filter medium adopts a repeatable 316L laser orifice plate to replace filter paper and is matched with an ultrasonic generator washing device to realize the repeated application of the filter medium; the upper holes of the filter medium are circular and uniformly distributed, the thickness of the filter medium is 1mm, the filtered filter medium is pressed through the annular pressing ring at the bottom end of the main body, and liquid is guided through the radiation groove at the bottom.
The automatic measuring device for the drilling fluid filtration loss adopts a high-pressure hose pump for sampling, and a computer is used for controlling the opening and closing of a sample injection valve and the starting and stopping of the pump; the sample enters a kettle, a piston is pressed by gas of an air compressor at constant pressure (0.7 MPa), drilling fluid is forced by the piston to filter reusable porous media under certain pressure, the filter loss of the drilling fluid in 30 minutes is measured by the descending distance of the piston, and the filter loss is recorded to a database; and after the primary filtration loss is over, opening a flushing valve and an ultrasonic washing device, and backwashing the porous filtration media. The next fluid loss test was then performed.
The automatic measuring device for the drilling fluid filtration loss adopts a full-automatic control system, the working process of an instrument is displayed on an interface, and the start and stop or time delay of each filtration main body and the valve (such as a clean water valve, a slurry valve, a backflushing valve, a drain valve and the like) of each system is controlled by computer software. A whole set of automatic control system is formed, a computer automatically collects pressure, temperature, filtration loss and the like, an original data report and a curve graph are generated, and a database file format and a data analysis function are generated at the same time.
Example 5: accuracy of bentonite (5%) drilling fluid test device
The filtration loss of 5% sakaguchi pulp is measured by using an automatic drilling fluid filtration loss measuring device and compared with the filtration loss measured by an API method, and the experimental results are shown in Table 1.
TABLE 1 on-line measurement of drilling fluid loss prototype and API measurement comparison
Example 6: preparing 4% bentonite drilling fluid, adding 0.2% polyacrylamide and 0.4% ammonium salt, measuring the filter loss of the drilling fluid by using a drilling fluid filter loss on-line measurement prototype, and comparing with an API (application program interface) filter loss measurement method, wherein the experimental results are shown in Table 2.
TABLE 2 comparison of drilling fluid loss on-line measurement prototype with API measurement results
As can be seen from the table, the automatic drilling fluid loss measurement device has stable numerical value, and compared with the drilling fluid loss obtained by the conventional measurement method in a laboratory, the data is accurate and reliable.
4% of bentonite drilling fluid is prepared, 0.2% of polyacrylamide and 0.4% of ammonium salt are added, and the dynamic filtration loss of the drilling fluid is measured by a drilling fluid filtration loss automatic measuring device, and the result is shown in figure 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, any modifications, substitutions, improvements and the like that are equivalent to the spirit and principle of the present invention are included in the scope of the present invention.
Claims (5)
1. An automatic measuring device for drilling fluid filtration loss comprises a filtration loss main body (A1) and a filter medium (A6), and is characterized by further comprising a filtrate measuring system and a flushing system;
the fluid loss body (A1) comprises: a closed piston chamber cylinder, a piston (A4) axially disposed within the piston chamber cylinder; the top of the piston is provided with a convex bolt which is matched with the top of a piston chamber cylinder in an axial sliding sealing way, the upper part of the piston chamber cylinder is provided with a pressure interface (A2) communicated with an upper sealing chamber of the piston, the middle part of the piston chamber cylinder is provided with an exhaust hole (A10) communicated with a lower sealing chamber of the piston, the bottom of the piston chamber cylinder is axially provided with a discharge interface (A7), the bottom of the piston chamber cylinder is radially provided with a clean water pump interface (A5) and a vent interface (A9) respectively, and a filter medium (A6) is arranged above the discharge interface (A7) at the bottom of;
the filter medium (A6) comprises filter paper or a metal plate and a metal filter screen which are uniformly distributed with filter holes;
the filtrate amount measuring system includes: a displacement sensor (10) arranged on a convex bolt at the top of the piston (A4) and a mass meter (21) connected with the discharge interface (A7);
the flushing system comprises an ultrasonic generator (A3) arranged in a piston (A4), a pressure valve (9) connected with a pressure interface (A2), a pressure gauge (6), a pressure regulating valve (7), an air source pressure gauge (5), an air pipeline and a high-pressure air source, a piston reset valve (8) connected with an exhaust hole (A10), the air source pressure gauge (5) and the air pipeline, a mud valve (17) connected with a clean water pump interface (A5), a mud pump (18), a clean water valve (16), a clean water pump (19), a pressure sensor (11) and a blow-down valve (12) connected with an emptying interface (A9), an emptying pipeline (13), a filtrate valve (14) and a recoil valve (15) connected with an exhaust interface (A7) and a clean water pump (19).
2. The automatic drilling fluid loss measurement device according to claim 1, characterized in that: the piston reset valve (8), the pressure valve (9), the pressure regulating valve, the blowdown valve (12), the filtrate valve (14), the backflushing valve (15), the clean water valve (16) and the slurry valve (17) are all electromagnetic valves; the flushing system further comprises a controller (4), wherein the controller (4) is respectively connected and controlled with the piston reset valve (8), the pressurizing valve (9), the pressure regulating valve, the drain valve (12), the filtrate valve (14), the backflushing valve (15), the clean water valve (16) and the slurry valve (17).
3. The automatic drilling fluid loss measurement device according to claim 2, characterized in that: the device is characterized in that other parts except a high-pressure air source, a mud pump (18), a clean water pump (19), an emptying pipeline (13) and a mass meter (21) are all arranged in a box body (20), and the box body (20) is respectively provided with a quick connector (2) connected with the high-pressure air source, the mud pump (18), the clean water pump (19) and the emptying pipeline (13) and an opening corresponding to a filtrate valve (14) to the mass meter (21).
4. The automatic drilling fluid loss measurement device according to any one of claims 1-3, wherein: an annular pressure ring (A8) is disposed over the filter media (A6) at the bottom of the piston chamber cylinder.
5. The automatic drilling fluid loss measurement device according to any one of claims 1-3, wherein: the high-pressure air source is a high-pressure air bottle or an air compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910511468.XA CN112082620A (en) | 2019-06-13 | 2019-06-13 | Automatic measuring device for drilling fluid filtration loss |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910511468.XA CN112082620A (en) | 2019-06-13 | 2019-06-13 | Automatic measuring device for drilling fluid filtration loss |
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| CN104747187A (en) * | 2015-03-30 | 2015-07-01 | 中国石油大学(华东) | Simulation experimenting device and method for high-temperature and high-pressure reinforced well wall drilling fluid |
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| CN211452497U (en) * | 2019-06-13 | 2020-09-08 | 中石化石油工程技术服务有限公司 | Automatic measuring device for drilling fluid filtration loss |
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2019
- 2019-06-13 CN CN201910511468.XA patent/CN112082620A/en active Pending
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| CN101109739A (en) * | 2006-07-21 | 2008-01-23 | 中国石油化工股份有限公司 | Bearing strength experiment instrument of high-temperature high-pressure mud cake plugging |
| US20100133204A1 (en) * | 2007-05-18 | 2010-06-03 | M-I Llc | Reusable filters for fluid loss measurements of drilling fluids |
| CN101788544A (en) * | 2010-02-03 | 2010-07-28 | 荆州市现代石油科技发展有限公司 | On-line tester for plugging capability of water-base mud |
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