Leaking stoppage test device
By using a combination of floating blocks and visible ports in the leak plugging test device, the problem of insufficient accuracy in recording the drilling fluid volume and maximum pressure value is solved, and a more accurate evaluation and selection of leak plugging materials is achieved.
Patent Information
- Application Number
- CN202421708247.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When the existing leak plugging test device records the drilling fluid volume and maximum pressure value, there is a problem that insufficient pressurization time leads to insufficient air pressure, which affects the accuracy of recording.
A leak plugging test device is designed, using a combination of a floating block and a viewing port. By observing whether the floating block has dropped to the lower edge of the viewing port, it is accurate to determine whether the drilling fluid has flowed out of the liquid outlet, so as to timely record the volume of drilling fluid flowing out of the liquid outlet and the air pressure when the drilling fluid flows empty.
Improve the accuracy of recording results of drilling fluid volume and maximum pressure value, ensuring more accurate evaluation and selection of leak-blocking materials.
Smart Images
Figure CN222979569U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of plugging test technologies, and particularly to a plugging test device. Background Art
[0002] Well leakage refers to the phenomenon that drilling fluid or other media in the wellbore leak into the pores, fractures and other spaces of the formation during the drilling process. Downhole complex accidents caused by well leakage are extremely harmful to drilling and completion operations. Therefore, well leakage has always been a concern in the domestic and foreign petroleum engineering fields. During the drilling construction process, adding appropriate plugging materials to the drilling fluid, and when the plugging materials flow through the lost circulation formation with the drilling fluid, they seal the gaps in the lost circulation formation, which is an important method for preventing and solving well leakage problems.
[0003] Different lost circulation formations require different plugging materials. Therefore, a plugging tester is often used to evaluate the plugging materials to provide a reliable basis for selecting plugging materials. The plugging tester mainly includes a base, a cylinder base arranged on the base, a sleeve arranged on the cylinder base, and a cover cylinder covering the sleeve. An air pump is connected to the cover cylinder in a communicating manner. The cylinder base is provided with a liquid outlet, and a measuring cup is placed below the liquid outlet. Small steel balls are filled in the sleeve to simulate different lost circulation formations. Then, a plugging slurry formed by mixing the drilling fluid and the plugging materials is added to the sleeve, and the cylinder cover is covered. The cylinder base is also provided with a plugging pressure backflow device, and the plugging pressure backflow device is communicated with the liquid outlet to detect the force required to reverse and break the plugging after successful plugging, so as to provide a more reliable basis for the rotation of the plugging materials.
[0004] The test process is usually as follows: pressurize at a speed of 0.014 MPa per second until 0.69 MPa is reached, record the volume of the discharged drilling fluid, and then increase the pressure at a speed of 0.069 MPa per second until the drilling fluid in the instrument container runs out, record the volume of the discharged drilling fluid and the maximum pressure reached, and evaluate the plugging materials through data analysis.
[0005] Since the air pressure when the drilling fluid runs out needs to be recorded finally, that is, the maximum pressure. Although it is possible to roughly judge whether there is still drilling fluid in the sleeve according to whether the liquid outlet continues to discharge liquid, there is a situation where the air pressure is insufficient due to insufficient pressurization time, resulting in some drilling fluid remaining between the small steel balls and not flowing out. In this case, the liquid outlet will not discharge liquid for a short time. If the record is made at this time, the recorded volume of the drilling fluid will not be accurate enough; if the pressurization continues until the liquid outlet does not discharge liquid for a long time, it can be judged that the drilling fluid has run out, but at this time, the record of the maximum pressure is also not accurate enough. Utility Model Content
[0006] In order to improve the accuracy of the recorded results of the drilling fluid volume and the maximum pressure value, the present application provides a plugging test device.
[0007] The plugging test device provided by this application adopts the following technical solution:
[0008] A plugging test device includes a base, a cylinder base fixed to the base, a sleeve arranged on the cylinder base, a cylinder cover covering and detachably connected to the sleeve, and a nozzle arranged on the cylinder cover. The nozzle is communicatively arranged in the sleeve. The cylinder base is provided with a liquid outlet, and the liquid outlet is communicated with the sleeve. A visual port is arranged on the cylinder wall of the sleeve. The lower edge of the visual port is flush with the upper side wall of the cylinder base. A blocking net is fixedly connected to the edge of the visual port. An expansion frame is also fixedly connected to the edge of the visual port. The expansion frame covers and is fixedly connected with a high-pressure glass, and a floating block is placed in the expansion frame.
[0009] By adopting the above technical solution, small steel balls are filled in the sleeve to simulate a lost formation, and the blocking net can prevent the small steel balls from entering the expansion frame. The expansion frame enables the floating block to be placed in the inner space of the sleeve without affecting the simulation of the lost formation by filling small steel balls. The high-pressure glass has the performance of resisting high pressure and can adapt to the high-pressure environment inside the sleeve to be able to observe the floating and sinking of the floating ball. After mixing the drilling fluid and the plugging material to form a plugging slurry, it is added to the sleeve and the cylinder cover is covered. At this time, the floating block rises as the liquid level rises. Connect the nozzle to an air pump to inject air into the sleeve for pressurization. The air pressure causes the drilling fluid to seep out of the small steel beads through the liquid outlet, and the floating block will also drop as the liquid level drops. Since the lower edge of the visual port is flush with the upper side wall of the cylinder base, it can be accurately judged whether the drilling fluid in the sleeve has flowed out by observing whether the floating block has dropped to the lower edge of the visual port, so as to be able to timely record the volume of the drilling fluid flowing out of the liquid outlet and the air pressure (the maximum pressure value) when the drilling fluid has flowed out, so as to be able to more accurately evaluate and select the plugging material.
[0010] Optionally, the floating block is slidably connected to the inner wall of the expansion frame.
[0011] By adopting the above technical solution, the floating block is slidably connected to the expansion frame, making the floating up and down of the floating block relative to the expansion frame more stable, so as to reduce the possibility of the floating block being stuck due to flipping during the floating up and down process.
[0012] Optionally, sliding grooves are respectively arranged on the side walls of the expansion frame. The long sides of the sliding grooves are parallel to the axis of the sleeve. The floating block is fixedly connected with a sliding block, and the sliding block is clamped and slid in the sliding groove.
[0013] By adopting the above technical solution, the floating block is stably slidably connected to the expansion frame by the sliding block being clamped and slid in the sliding groove.
[0014] Optionally, a material cylinder is placed in the sleeve. A plurality of leakage holes are arranged on the cylinder wall of the material cylinder, and the outer diameter of the material cylinder is equal to the inner diameter of the sleeve.
[0015] By adopting the above technical solution, the barrel is taken out of the sleeve, small steel balls are filled into the barrel to simulate a lost circulation formation, and filling small steel balls outside the sleeve enables more accurate operation and simulation of different lost circulation formations. Then, the barrel is placed into the sleeve. Since the outer diameter of the barrel is equal to the inner diameter of the sleeve, the drilling fluid can flow into the barrel and pass through the small steel balls.
[0016] Optionally, the inner wall profile of the sleeve is in the shape of a stepped shaft, the small end of the sleeve is arranged at the lower part, the outer diameter of the barrel is equal to the inner diameter of the small end of the sleeve, a fixing ring is fixedly connected to the upper opening edge of the barrel, a first sealing ring is fixedly connected to the fixing ring, and the first sealing ring is arranged in a manner that fits the transition surface between the large end and the small end of the sleeve.
[0017] By adopting the above technical solution, when pressurizing the inside of the sleeve, the atmospheric pressure causes the fixing ring to be close to the transition surface between the large end and the small end of the sleeve, and the sealing ring seals the gap between the fixing ring and the transition surface of the large end and the small end of the sleeve, so as to reduce the possibility that the drilling fluid flows out through the gap between the barrel and the inner wall of the sleeve and affects the test results.
[0018] Optionally, a lifting ring is provided on the barrel.
[0019] By adopting the above technical solution, holding the lifting ring facilitates taking the barrel out of or putting it into the sleeve.
[0020] Optionally, the inner wall profile of the cylinder cover is cylindrical, and the cylinder cover is buckled and threadedly connected to the sleeve.
[0021] By adopting the above technical solution, the cylinder cover can tightly seal the opening of the sleeve. While ensuring airtightness, the cylinder cover can be detachably connected to the sleeve.
[0022] Optionally, two tightening rods are fixedly connected to the cylinder cover, and the two tightening rods are located on both sides of the cylinder cover.
[0023] By adopting the above technical solution, the two tightening rods increase the lever arm for turning the cylinder cover, enabling the cylinder cover to be screwed tighter relative to the sleeve, and further improving the airtightness of the connection between the sleeve and the cylinder cover.
[0024] Optionally, an air release valve is provided on the cylinder cover, and the air release valve is communicated with the internal space of the sleeve.
[0025] By adopting the above technical solution, the internal space of the sleeve is depressurized through the air release valve, so that the cylinder cover can be opened relatively easily, and the possibility of being impacted by air pressure when opening the cylinder cover is reduced, improving safety.
[0026] In summary, the present application includes at least one of the following beneficial technical effects:
[0027] 1. By observing whether the floating block drops to the lower edge of the visible opening, it is possible to accurately judge whether the drilling fluid in the sleeve has run out, so that the volume of the drilling fluid flowing out of the liquid outlet and the air pressure (maximum pressure value) when the drilling fluid runs out can be recorded in time, so as to more accurately evaluate and select the plugging material;
[0028] 2. Take out the cartridge from the sleeve, fill the cartridge with small steel balls to simulate the lost circulation formation. Placing small steel balls outside the sleeve can operate and simulate different lost circulation formations more accurately;
[0029] 3. The two tightening rods increase the lever arm for turning the cylinder cover, so that the cylinder cover can be screwed tighter relative to the sleeve, further improving the airtightness of the connection between the sleeve and the cylinder cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 is a schematic structural diagram of an embodiment of the present application.
[0031] Figure 2 is a schematic partial sectional structural diagram of an embodiment of the present application.
[0032] Reference numerals: 1, base; 11, chassis; 12, support seat; 2, cylinder seat; 21, liquid outlet; 3, sleeve; 31, visible opening; 32, second sealing ring; 4, cylinder cover; 41, air nozzle; 42, tightening rod; 43, air release valve; 44, pressure gauge; 5, intercepting net; 6, expansion frame; 61, high-pressure glass; 62, sliding groove; 7, floating block; 8, cartridge; 81, leakage hole; 82, fixing ring; 821, first sealing ring; 83, lifting ring; 9, plugging pressure backflow device. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The following will Figure 1-2 further describe the present application in detail.
[0034] The embodiment of the present application discloses a plugging test device. Refer to Figure 1 and Figure 2 , the plugging test device includes a base 1, a cylinder seat 2, a sleeve 3, a cylinder cover 4 and an air nozzle 41 provided on the cylinder cover 4. The base 1 includes a chassis 11 and a support seat 12. The chassis 11 is a disc, and the support seat 12 is fixed to the chassis 11. The support seat 12 is located on the central axis of the chassis 11. The cross-sectional profile of the cylinder seat 2 is in the shape of a stepped shaft, and the large end of the cylinder seat 2 is fixedly connected to one end of the support seat 12 away from the chassis 11.
[0035] Refer to Figure 1 and Figure 2, the sleeve 3 is in a circular tube shape. The sleeve 3 is sleeved and fixedly connected to the small end of the cylinder base 2. A second sealing ring 32 is fixedly connected to the edge of the cylinder opening at the lower end of the sleeve 3. The second sealing ring 32 is arranged around the central axis of the sleeve 3. The first sealing ring 821 abuts against the transition surface between the large end and the lower end of the cylinder base 2. The cylinder body is provided with a liquid outlet 21, and the liquid outlet 21 is communicated with the sleeve 3.
[0036] The second sealing ring 32 strengthens the sealing performance between the sleeve 3 and the cylinder base 2, so that when the inside of the sleeve 3 is pressurized, it is not easy for pressure to leak between the sleeve 3 and the cylinder base 2; and it can reduce the possibility of drilling fluid seeping out through the sleeve 3 and the cylinder base 2.
[0037] Refer to Figure 1 and Figure 2 , the inner wall contour of the cylinder cover 4 is cylindrical. One side plane side wall of the cylinder cover 4 is open. The cylinder cover 4 is buckled on the end of the sleeve 3 far from the cylinder base 2, and the cylinder cover 4 is threadedly connected to the sleeve 3. The cylinder cover 4 is fixedly connected with two tightening rods 42. The two tightening rods are located on both sides of the cylinder cover 4, and both of the two tightening rods 42 are horizontally arranged.
[0038] The cylinder cover 4 can tightly seal the opening of the sleeve 3. While ensuring airtightness, the threaded connection of the cylinder cover 4 to the sleeve 3 enables the cylinder cover 4 to be detachably connected to the sleeve 3. The two tightening rods 42 increase the lever arm for turning the cylinder cover 4, so that the cylinder cover 4 can be screwed tighter relative to the sleeve 3, further improving the airtightness of the connection between the sleeve 3 and the cylinder cover 4.
[0039] Refer to Figure 1 and Figure 2 , a visual port 31 is opened on the cylinder wall of the sleeve 3. The lower edge of the visual port 31 is flush with the upper side wall of the cylinder base 2. The long side of the visual port 31 is parallel to the axis of the sleeve 3. A blocking net 5 is fixedly connected to the edge of the visual port 31, and the blocking net 5 covers the visual port 31. An expansion frame 6 is also fixedly connected to the edge of the visual port 31. The expansion frame 6 is arranged in the same opening direction as the visual port 31. A high-pressure glass 61 is fixedly connected to the edge of the expansion frame 6 far from the visual port 31, and the high-pressure glass 61 covers the visual port 31. A floating block 7 is placed in the expansion frame 6.
[0040] Small steel balls are filled in the sleeve 3 to simulate a lost circulation formation. The blocking net 5 can prevent the small steel balls from entering the expansion frame 6. The expansion frame 6 enables the floating block 7 to be placed in the inner space of the sleeve 3 without affecting the filling of small steel balls to simulate the lost circulation formation. The high-pressure glass 61 has the performance of resisting high pressure and can adapt to the high-pressure environment inside the sleeve 3 to be able to observe the floating and sinking of the floating ball.
[0041] After mixing the drilling fluid and the lost circulation material to form a lost circulation slurry, add it to the sleeve 3 and cover the cylinder cover 4. At this time, the floating block 7 rises as the liquid level rises. Connect the air nozzle 41 to an air pump to supply air into the sleeve 3 for pressurization. The air pressure causes the drilling fluid to flow out of the liquid outlet 21 through the small steel balls, the liquid level in the sleeve 3 drops, and the floating block 7 also drops as the liquid level drops.
[0042] Since the lower edge of the visual port 31 is flush with the upper side wall of the cylinder base 2, it is possible to accurately judge whether the drilling fluid in the sleeve 3 has emptied by observing whether the floating block 7 has dropped to the lower edge of the visual port 31, so that the volume of the drilling fluid flowing out of the liquid outlet 21 and the air pressure (maximum pressure value) when the drilling fluid has emptied can be recorded in time, so as to more accurately evaluate and select the lost circulation material.
[0043] Refer to Figure 1 and Figure 2 To reduce the possibility that too much drilling fluid flows into the expansion frame 6 and affects the seepage of the drilling fluid, the volume of the expansion frame 6 needs to be set small. The floating block 7 is prone to slight flipping during the rising or falling process. Since the volume of the expansion frame 6 is small, the floating block 7 is easily stuck by the inner wall of the expansion frame 6 during the flipping process, resulting in the floating block 7 being unable to float with the liquid level. Slide grooves 62 are respectively formed on the side walls of the expansion frame 6. The long side of the slide groove 62 is parallel to the axis of the sleeve 3. The floating block 7 is fixedly connected with a slider, and the slider is clamped and slides in the slide groove 62.
[0044] By clamping and sliding the slider in the slide groove 62, the floating block 7 is stably slidably connected to the expansion frame 6. The floating block 7 is slidably connected to the expansion frame 6, making the floating or falling of the floating block 7 relative to the expansion frame 6 more stable and not prone to flipping, so as to reduce the possibility that the floating block 7 is stuck due to flipping during the rising and falling process.
[0045] Refer to Figure 2 To facilitate the filling of small steel balls to more accurately simulate different lost circulation formations, a cartridge 8 is placed in the sleeve 3. The cartridge 8 is a hollow cylindrical structure with an upper opening. A plurality of leakage holes 81 are formed on the barrel wall of the cartridge 8, and the plurality of leakage holes 81 are arranged in an array on the outer wall of the cartridge 8.
[0046] Refer to Figure 2 The inner wall profile of the sleeve 3 is in the shape of a stepped shaft, with the small end of the sleeve 3 at the lower part. The outer diameter of the cartridge 8 is equal to the inner diameter of the small end of the sleeve 3. The upper opening edge of the cartridge 8 is fixedly connected with a fixing ring 82. The fixing ring 82 is arranged around the central axis of the cartridge 8, and the fixing ring 82 is placed on the transition surface between the large end and the small end of the sleeve 3. The fixing ring 82 is fixedly connected with a first sealing ring 821. The first sealing ring 821 is arranged around the central axis of the fixing ring 82, and the first sealing ring 821 is attached to the transition surface between the large end and the small end of the sleeve 3.
[0047] Referring to Figure 2 , a lifting ring 83 is rotatably connected to the upper open edge of the barrel 8. The lifting ring 83 is semicircular, and the opening direction of the lifting ring 83 faces the barrel 8. Hold the lifting ring 83 to facilitate taking out or putting the barrel 8 into the sleeve 3.
[0048] Take out the barrel 8 from the sleeve 3, fill small steel balls into the barrel 8 to simulate a lost circulation formation. Placing small steel balls outside the sleeve 3 can operate and simulate different lost circulation formations more accurately. Then put the barrel 8 into the sleeve 3 so that the fixing ring 82 and the first sealing ring 821 are placed on the transition surface between the large end and the small end of the sleeve 3.
[0049] When pressurizing the inside of the sleeve 3, the atmospheric pressure makes the fixing ring 82 close to the transition surface between the large end and the small end of the sleeve 3, and the sealing ring seals the gap between the fixing ring 82 and the transition surface of the large end and the small end of the sleeve 3 to reduce the possibility that the drilling fluid flows out through the gap between the barrel 8 and the inner wall of the sleeve 3 and affects the test results.
[0050] Referring to Figure 1 and Figure 2 , after all the drilling fluid in the sleeve 3 is pressed out of the liquid outlet 21, the pressure inside the sleeve 3 is relatively high, and it is directly dangerous to open it. An air release valve 43 is fixedly connected to the upper side wall of the cylinder cover 4, and the air release valve 43 communicates with the internal space of the sleeve 3. A pressure gauge 44 is also fixedly connected to the upper side wall of the cylinder cover 4, and the detection end of the pressure gauge 44 is located inside the sleeve 3.
[0051] Release the pressure of the internal space of the sleeve 3 through the air release valve 43 so that the cylinder cover 4 can be opened relatively easily, and reduce the possibility of being impacted by air pressure when opening the cylinder cover 4, improving safety. The pressure gauge 44 detects the pressure inside the sleeve 3. When the pressure gauge 44 detects that the air release valve 43 has released pressure to a certain extent, the cylinder cover 4 can be opened relative to the sleeve 3.
[0052] Referring to Figure 1 , to further improve the reliability of evaluating the plugging material, the base 2 of the cylinder is also provided with a plugging pressure backflow device 9. The plugging pressure backflow device 9 communicates with the liquid outlet 21 to detect the force required to reverse the plugging after successful plugging, providing a more reliable basis for the rotation of the plugging material.
[0053] The implementation principle of a plugging test device according to an embodiment of the present application is as follows: After forming a plugging slurry by mixing the drilling fluid and the plugging material, add it to the sleeve 3 and cover the cylinder cover 4. At this time, the floating block 7 rises as the liquid level rises. Connect the air nozzle 41 to an air pump to supply air into the sleeve 3 for pressurization. The air pressure makes the drilling fluid seep out of the small steel balls and flow out of the liquid outlet 21, and the liquid level inside the sleeve 3 drops, and the floating block 7 also drops as the liquid level drops.
[0054] Since the lower edge of the visual port 31 is flush with the upper side wall of the barrel base 2, it is possible to accurately judge whether the drilling fluid in the sleeve 3 has run out by observing whether the floating block 7 has dropped to the lower edge of the visual port 31, so that the volume of the drilling fluid flowing out of the liquid outlet 21 and the air pressure (maximum pressure value) when the drilling fluid runs out can be recorded in time, so as to more accurately evaluate and select the plugging material.
[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A leak-proofing test device, comprising a base (1), a cartridge seat (2) fixed to the base (1), a sleeve (3) arranged on the cartridge seat (2), a cartridge cover (4) detachably connected to the sleeve (3), and an air nozzle (41) arranged on the cartridge cover (4), wherein the air nozzle (41) is connected to the sleeve (3), the cartridge seat (2) is provided with a liquid outlet (21), and the liquid outlet (21) is connected to the sleeve (3), characterized in that: The wall of the sleeve (3) is provided with a visual opening (31), the lower edge of the visual opening (31) is flush with the upper side wall of the sleeve seat (2), the edge of the visual opening (31) is fixedly connected to an interception net (5), the edge of the visual opening (31) is also fixedly connected to an expansion frame (6), the expansion frame (6) is covered with and fixedly connected to a high-pressure glass (61), and a floating block (7) is placed inside the expansion frame (6).
2. A leak testing device according to claim 1, characterized in that: The floating block (7) is slidably connected to the inner wall of the expansion frame (6).
3. A leak testing device according to claim 2, characterized in that: The side walls of the expansion frame (6) are respectively provided with sliding grooves (62), the long sides of the sliding grooves (62) are parallel to the axis of the sleeve (3), and the floating block (7) is fixedly connected with a sliding block, which is clamped and slides in the sliding grooves (62).
4. A leak testing device according to claim 1, characterized in that: A barrel (8) is placed inside the sleeve (3), a barrel wall of the barrel (8) is provided with a plurality of leakage holes (81), and an outer diameter of the barrel (8) is equal to an inner diameter of the sleeve (3).
5. A leak testing device according to claim 4, characterized in that: The inner wall profile of the sleeve (3) is in the shape of a stepped shaft. The small end of the sleeve (3) is arranged at the bottom. The outer diameter of the barrel (8) is equal to the inner diameter of the small end of the sleeve (3). A fixing ring (82) is fixedly connected to the edge of the upper opening of the barrel (8). The fixing ring (82) is fixedly connected to a first sealing ring (821). The first sealing ring (821) is arranged in contact with the transition surface between the large end and the small end of the sleeve (3).
6. A leak-proof test device according to claim 4, characterized in that: The barrel (8) is provided with a lifting ring (83).
7. A leak testing device according to claim 1, characterized in that: The inner wall profile of the cylinder cover (4) is cylindrical, and the cylinder cover (4) is buckled and threadedly connected to the sleeve (3).
8. A leak-proof test device according to claim 7, characterized in that: The cylinder cover (4) is fixedly connected to two tightening rods (42), and the two tightening rods are located on both sides of the cylinder cover (4).
9. A leak testing device according to claim 1, characterized in that: The cylinder cover (4) is provided with an air release valve (43), and the air release valve (43) is connected to the internal space of the sleeve (3).