An automatic measuring device for drilling fluid loss

Abstract

The present invention relates to an automatic measuring device for drilling fluid filtration loss, comprising a filtration loss body, a filter medium, a filtrate measurement system, and a flushing system; the filtration loss body comprises a closed piston chamber cylinder and a piston, the piston chamber cylinder is provided with a pressure interface, an exhaust hole, a discharge interface, a clean water pump interface, and a venting interface, and a filter medium is arranged above the discharge interface at the bottom of the piston chamber cylinder; the filtrate measurement 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 valve, a mud pump, a clean water valve, a clean water pump, a pressure sensor, a drain valve, a filtrate valve, and a recoil valve. The device of the present invention can realize the functions of automatic pressurization of the automatic measuring instrument for drilling fluid filtration loss, continuous and timed recording and measuring of filtration loss, and automatic cleaning.

Description

Technical Field

[0001] The invention relates to a device for measuring the filtration loss of relevant liquids in the process of petroleum development, in particular to a device for automatically measuring the filtration loss of drilling fluids. Background Art

[0002] The filtration loss of drilling fluid is an important performance parameter of drilling fluid. At present, in routine drilling operations, the method used to determine the filtration loss is mainly to conduct low-temperature and low-pressure experiments with a filtration meter to obtain the API filtration loss. This method must ensure that all parts of the drilling fluid cup, especially the filter screen, are clean and dry, and that the sealing gasket is not deformed or damaged. During the test, the drilling fluid is injected into the drilling fluid cup so that the liquid level is at least 13mm from the top (to reduce the contamination of the filtrate by carbon dioxide), and then the filter paper is placed and the instrument is installed. Place a dry measuring cylinder under the discharge pipe to receive the filtrate. Close the pressure reducing valve and adjust the pressure regulator so that the pressure reaches (690±35KPa) in 30 seconds or less. Start timing while pressurizing, and measure the volume of the filtrate after 30 minutes. Close the pressure regulator and carefully open the pressure reducing valve. In cm 3 Record the volume of the filtrate in units (accurate to 0.1 cm 3 ), and the result is used as the API filtration loss. From the above process, it can be seen that the conventional method requires a large sample volume (filling the sample cup is about 300cm 3 ), it is time-consuming (the experimental process takes at least 30 minutes) and has many operation steps. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of automatic measuring device for drilling fluid loss in response to the problems existing in the prior art, which can measure the drilling fluid loss regularly and accurately, solve the problem of automatic online monitoring of drilling fluid loss, and provide favorable technical support for automated drilling.

[0004] The technical scheme is: an automatic measuring device for the filtration loss of drilling fluid, comprising a filtration loss body, a filter medium, a filtrate measurement system and a flushing system; the filtration loss body comprises: a closed piston chamber cylinder, a piston axially arranged inside the piston chamber cylinder, a convex bolt axially slidingly sealed with the top of the piston chamber cylinder is arranged on the top of the piston chamber cylinder, a pressure interface connected to the upper sealing chamber of the piston is arranged on the upper part of the piston chamber cylinder, an exhaust hole connected to the lower sealing chamber of the piston is arranged in the middle 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 a venting interface are respectively arranged radially, 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 or metal filter screen uniformly distributed with filter holes; the filtrate measurement system comprises: a displacement sensor installed on the convex bolt on the top of the piston and a mass meter connected to the discharge interface; The flushing system includes an ultrasonic generator arranged in the piston, as well as a pressurizing valve, a pressure gauge, a pressure regulating valve, an air source pressure gauge and an air pipeline, and a high-pressure air source connected to the pressure interface, a piston reset valve, an air source pressure gauge and an air pipeline connected to the exhaust hole, a mud valve, a mud pump and a clean water valve, a clean water pump connected to the clean water pump interface, a pressure sensor and a drain valve, a drain pipeline connected to the vent interface, and a filtrate valve, a backwash valve, and a clean water pump connected to the discharge interface.

[0005] The above scheme further includes: the piston reset valve, pressure valve, pressure regulating valve, drain valve, filtrate valve, backwash valve, clean water valve and mud valve are all solenoid valves; the flushing system also includes a controller, and the controller is connected to the piston reset valve, pressure valve, pressure regulating valve, drain valve, filtrate valve, backwash valve, clean water valve and mud valve for control respectively.

[0006] In the device, all components except the high-pressure gas source, mud pump, clean water pump, venting pipeline and mass meter are arranged in a box body, and quick connectors connected to the high-pressure gas source, mud pump, clean water pump and venting pipeline, as well as openings corresponding to the filtrate valve to the mass meter are arranged on the box body.

[0007] An annular pressure ring A is arranged above the filter medium A at the bottom of the piston chamber cylinder.

[0008] The high-pressure gas source is a high-pressure gas cylinder or an air compressor.

[0009] The device of the present invention uses a repeatable filter medium to replace the filter paper, and cooperates with an ultrasonic generator for washing to achieve repeated use of the filter medium; all valves of the product use 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 such as heat preservation, rain protection, and explosion protection are fully considered. A displacement sensor is installed at the top of the filter loss body, and the filtered liquid is discharged through the bottom port. Interfaces for connecting a clean water pump, a mud pump, and emptying are reserved on both sides of the body. An ultrasonic generator washing device is installed in the filter loss body, which can effectively realize the washing of the mud cake, so that the filter medium can be reused. The filtrate measurement system includes a displacement sensor, and a displacement sensor is installed at the top of the filter loss body to sense the piston descending distance in the filter loss body and record the filter loss data. The automatic flushing system includes a clean water pump, an ultrasonic generator device, a pressure valve, a mud valve, a clean water valve, a filtrate valve, a sewage valve, and all other valves are automatically controlled by electromagnetic valves. The flushing system injects clean water into the body through a clean water pump, starts the ultrasonic generator, and flushes the body. At the same time, the flushing liquid is emptied.

[0010] Effect of the invention: The automatic measuring device for drilling fluid filtration loss of the present invention can realize the functions of automatic pressurization of the automatic measuring instrument for drilling fluid filtration loss, continuous and timed recording and measuring of filtration loss, and automatic cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic structural diagram of a typical embodiment.

[0012] Attached Figure 2 Schematic diagram of the online evaluation device for drilling fluid filtration performance.

[0013] Attached Figure 3 This is a graph showing the change of filtration loss over time.

[0014] In the figure: A1 filtration body, A2 pressure interface, A3 ultrasonic generator, A4 piston, A5 clean water pump interface, A6 filter medium, A7 discharge interface, A8 annular pressure ring, A9 vent interface, A10 exhaust hole, 1 gas pipeline A, 2 quick connector, 3 gas pipeline B, 4 controller, 5 gas source pressure gauge, 6 pressure gauge, 7 pressure regulating valve, 8 piston reset valve, 9 pressurizing valve, 10 displacement sensor, 11 pressure sensor, 12 drain valve, 13 vent pipeline, 14 filtrate valve, 15 backflush valve, 16 clean water valve, 17 mud valve, 18 mud pump, 19 clean water pump, 20 box, 21 mass meter. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Refer to the attached Figure 1, the present invention is implemented in the following ways: Example 1: An automatic measuring device for the filtration loss of drilling fluid, comprising a filtration loss body A1, a filter medium A6, a filtrate measurement system, and a flushing system; the filtration loss body A1 comprises: a closed piston chamber cylinder, a piston A4 axially arranged inside the piston chamber cylinder, a convex bolt axially slidingly sealed with the top of the piston chamber cylinder is provided on the top of the piston, a pressure interface A2 connected to the upper sealing chamber of the piston is provided on the upper part of the piston chamber cylinder, an exhaust hole A10 connected to the lower sealing chamber of the piston is provided in the middle of the piston chamber cylinder, a discharge interface A7 is axially provided at the bottom of the piston chamber cylinder, a clean water pump interface A5 and a venting interface A9 are respectively provided radially, and a filter medium A6 is provided above the discharge interface A7 at the bottom of the piston chamber cylinder; the filter medium A6 comprises filter paper or a metal plate or metal filter screen uniformly distributed with filter holes; the filtrate measurement system comprises: a displacement sensor 10 installed on the convex bolt on the top of the piston A4 and a mass meter 21 connected to the discharge interface A7; The flushing system includes an ultrasonic generator A3 arranged in the piston A4, as well as a pressurizing valve 9, a pressure gauge 6, a pressure regulating valve 7, an air source pressure gauge 5 and an air pipeline, and a high-pressure air source connected to the pressure interface A2, a piston reset valve 8, an air source pressure gauge 5 and an air pipeline connected to the exhaust hole A10, a mud valve 17, a mud pump 18 and a clean water valve 16, a clean water pump 19 connected to the clean water pump interface A5, a pressure sensor 11 and a drain valve 12, a drain pipeline 13 connected to the vent interface A9, and a filtrate valve 14, a backflush valve 15, and a clean water pump 19 connected to the discharge interface A7.

[0017] Embodiment 2: The above-mentioned embodiment 1 further includes: the piston reset valve 8, pressure valve 9, pressure regulating valve 7, drain valve 12, filtrate valve 14, backwash valve 15, clean water valve 16 and mud valve 17 are all solenoid valves; the flushing system also includes a controller 4, and the controller 4 is connected to the piston reset valve 8, pressure valve 9, pressure regulating valve 7, drain valve 12, filtrate valve 14, backwash valve 15, clean water valve 16 and mud valve 17 for control respectively.

[0018] In the device, except for the high-pressure gas source, mud pump 18, clean water pump 19, venting pipeline 13 and mass meter 21, all other components are arranged in the box 20, and the box 20 is respectively provided with a quick connector 2 connected to the high-pressure gas source, mud pump 18, clean water pump 19 and venting pipeline 13, as well as openings corresponding to the filtrate valve 14 to the mass meter 21.

[0019] An annular pressure ring A8 is arranged above the filter medium A6 at the bottom of the piston chamber cylinder.

[0020] Embodiment 3: An automated measuring device for drilling fluid filtration loss, wherein a displacement sensor 10 is installed on the upper part of a filtration loss body A1, a pressure interface A2 is provided at the upper right corner of the filtration loss body, a piston A4 is connected to the lower part of the displacement sensor 10, an ultrasonic generator A3 is installed in the piston A4, a clean water pump interface A5 and a vent interface A9 are provided at the bottom of the filtration loss body, an exhaust hole A10 is provided in the middle, a filter medium A6 and an annular pressure ring A8 are provided at the lower part of the filtration loss body, and a filtrate discharge interface A7 is provided at the bottom.

[0021] Drilling fluid filtration test platform Figure 2 , which can be achieved by: Figure 2 The middle thick dashed line shows the internal structure of the box 20, and the thin dashed line shows the control line of the controller 4. The upper part of the box 20 has a quick connector 2 and a gas pipeline 1 to connect the gas cylinder or air compressor. The upper part of the box 20 has another line to connect the computer control system. The lower right part of the box 20 has a quick connector 2 and a pipeline to connect the mud pump 18 and the clean water pump 19. The lower left part is the venting pipeline 13. The bottom of the box has a discharge interface to discharge the filtrate directly. The main part inside the chassis is the filtration body A1, with a displacement sensor 10 on the upper part, and the gas supply pipeline 1 is connected to the gas source pressure gauge 5, the pressure regulating valve 7, the pressure gauge 6, the pressurizing valve 9, and the piston reset valve 8. The left outlet below the main body is connected to the pressure sensor 11 and the drain valve 12 connected to the vent pipeline 13, and the mud valve 17 and the clean water valve 16 are connected to the mud pump 18 and the clean water pump 19 respectively at the lower right of the main body; the backflush valve 15 is connected to the clean water pump 19 at the bottom of the main body, and the filtrate valve 14 is also connected to the bottom of the main body.

[0022] Example 4: The filtration body is made of stainless steel with a pressure resistance of 1.5MPa. A displacement sensor is installed on the top, the piston stroke is 50mm, the ultrasonic generator is installed in the piston, and there is a filter medium at the bottom to filter impurities, and the filtered liquid flows out through the bottom port. Interfaces for connecting clean water pumps, mud pumps and vents are left on both sides of the main body. The filter medium uses a repeatable 316L laser orifice plate instead of filter paper and cooperates with an ultrasonic generator washing device to achieve repeated use of the filter medium; the holes on the filter medium are circular and evenly distributed, the medium thickness is 1mm, and the filtered filter medium is pressed by the annular pressure ring at the bottom of the main body, and the liquid is guided through the radial grooves at the bottom.

[0023] The automatic measuring device for drilling fluid loss uses a high-pressure hose pump to take samples, and uses a computer to control the switch of the sampling valve and the start and stop of the pump; the sample enters the kettle, and the gas of the air compressor presses the piston at a constant pressure (0.7MPa). The piston presses the drilling fluid to force the drilling fluid to filter through the reusable porous medium under a certain pressure. The distance the piston descends is used to measure the drilling fluid loss in 30 minutes, and the loss is recorded in the database; after one loss, open the flushing valve and ultrasonic washing device, and backwash the porous loss medium. Then the next loss test is carried out.

[0024] The drilling fluid filtration loss automatic measuring device adopts a fully automatic control system. The instrument workflow is displayed on the interface, and the start and stop or delay of each filtration body and valve of each system (such as clean water valve, mud valve, backwash valve, sewage valve, etc.) are controlled by computer software. A complete set of automatic control system is formed. The computer automatically collects pressure, temperature, filtration loss, etc., generates original data reports and curves, and generates database file formats and data analysis functions.

[0025] Example 5: Accuracy of Bentonite (5%) Drilling Fluid Test Device

[0026] The filtration loss of 5% sakanofuran slurry was measured using an automated drilling fluid filtration loss measurement device and compared with the filtration loss measured by the API method. The experimental results are shown in Table 1.

[0027] Table 1 Comparison of drilling fluid filtration loss online measurement prototype and API measurement results

[0028] Number of measurements Online measurement of drilling fluid loss (ml) API (ml) Deviation (ml) 1 17.0 18.0 -1.0 2 18.2 17.6 +0.6 3 17.0 17.2 -0.2 4 16.0 16.8 -0.8 5 17.8 17.4 +0.4 6 17.2 17.8 -0.6 7 17.0 18.0 -1.0 8 18.2 18.8 -0.6 9 17.6 16.4 +1.2 10 17.0 17.8 -0.8

[0029] Example 6: 4% bentonite drilling fluid was prepared, 0.2% polyacrylamide + 0.4% ammonium salt were added, and the filtration loss of the drilling fluid was measured using an online filtration loss measurement prototype. The results were compared with the API filtration loss measurement method. The experimental results are shown in Table 2.

[0030] Table 2 Comparison of drilling fluid filtration loss online measurement prototype and API measurement results

[0031] Number of measurements Online measurement of drilling fluid loss (ml) API (ml) Deviation (ml) 1 15.2 15 +0.2 2 14.6 15.2 -0.6 3 14.8 15.4 -0.6 4 14.9 15.5 -0.6 5 15.8 15.6 +0.2 6 15.0 15.8 -0.8 7 16.6 16.0 +0.6 8 15.8 16.2 -0.4 9 16.6 15.9 +0.7 10 16.8 16.0 +0.8

[0032] It can be seen from the table that the numerical value of the automatic measurement device for drilling fluid loss is stable. Compared with the drilling fluid loss obtained by the conventional laboratory measurement method, the data is accurate and reliable.

[0033] Prepare 4% bentonite drilling fluid, add 0.2% polyacrylamide + 0.4% ammonium salt, and use the drilling fluid filtration loss automatic measuring device to measure the dynamic filtration loss of the drilling fluid. The results are as follows: Figure 3 .

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, replacements, improvements, etc. with equivalent effects made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An automatic measuring device for drilling fluid filtration loss, comprising a filtration loss body (A1) and a filter medium (A6), characterized in that It also includes a filtrate measurement system and a flushing system; the filtration loss body (A1) includes: a closed piston chamber cylinder, a piston (A4) axially arranged inside the piston chamber cylinder; a convex bolt axially slidingly sealingly matched with the top of the piston chamber cylinder is provided at the top of the piston; a pressure interface (A2) connected to the piston upper sealing chamber is provided at the top of the piston chamber cylinder; an exhaust hole (A10) connected to the piston lower sealing chamber is provided at the middle of the piston chamber cylinder; a discharge interface (A7) is axially provided at the bottom of the piston chamber cylinder, and a clean water pump interface (A5) and a venting interface (A9) are respectively provided radially; and a filter medium (A6) is provided above the discharge interface (A7) at the bottom of the piston chamber cylinder; the filter medium (A6) includes filter paper or a metal plate or metal filter screen uniformly distributed with filter holes; the filtrate measurement system includes: a displacement sensor (10) installed on the convex bolt on the top of the piston (A4) and a mass meter (21) connected to the discharge interface (A7); The flushing system comprises an ultrasonic generator (A3) arranged in the piston (A4), a pressurizing valve (9), a pressure gauge (6), a pressure regulating valve (7), an air source pressure gauge (5) and an air pipeline, and a high-pressure air source connected to the pressure interface (A2); a piston reset valve (8), an air source pressure gauge (5) and an air pipeline connected to the exhaust hole (A10); a mud valve (17), a mud pump (18) and a clean water valve (16), and a clean water pump (19) connected to the clean water pump interface (A5); a pressure sensor (11) and a drain valve (12), and a drain pipeline (13) connected to the drain interface (A9); and a piston reset valve (8), an air source pressure gauge (5) and an air pipeline connected to the exhaust hole (A10). The invention relates to a device for producing a filtrate valve (14), a backflush valve (15) and a clean water pump (19) connected to a port (A7); the components of the device except for a high-pressure gas source, a mud pump (18), a clean water pump (19), a venting pipeline (13) and a mass meter (21) are all arranged in a box body (20); a quick connector (2) connected to the high-pressure gas source, the mud pump (18), the clean water pump (19) and the venting pipeline (13) is respectively arranged on the box body (20), and openings corresponding to the filtrate valve (14) to the mass meter (21); and an annular pressure ring (A8) is arranged above the filter medium (A6) at the bottom of the piston chamber cylinder.

2. The automatic measuring device for drilling fluid loss according to claim 1, characterized in that: The piston reset valve (8), the pressure-increasing valve (9), the pressure-regulating valve, the drain valve (12), the filtrate valve (14), the back-flushing valve (15), the clean water valve (16) and the mud valve (17) are all solenoid valves; the flushing system further comprises a controller (4), the controller (4) being connected to and controlled by the piston reset valve (8), the pressure-increasing valve (9), the pressure-regulating valve, the drain valve (12), the filtrate valve (14), the back-flushing valve (15), the clean water valve (16) and the mud valve (17), respectively.

3. The automatic measuring device for drilling fluid loss according to any one of claims 1-2, characterized in that: The high-pressure gas source is a high-pressure gas cylinder or an air compressor.

Images