A combined blowout preventer pressure testing device and method of use

Abstract

The application belongs to the technical field of petroleum drilling equipment, and discloses a combined blowout preventer pressure testing device and a use method. The combined blowout preventer pressure testing device comprises a pressure testing blind plate guide shoe and a pressure testing blind plate simulated drill string. The pressure testing blind plate guide shoe comprises an automatic guide mechanism, a centering mechanism, a pressure testing blind plate, a connecting groove, a water pressure interface, a pressure relief port and a sealing steel ring groove. The automatic guide mechanism is fixed to the top of the centering mechanism. The centering mechanism is located at the top of the pressure testing blind plate. The connecting groove is arranged at the center of the automatic guide mechanism and the centering mechanism. The lower end of the pressure testing blind plate simulated drill string is detachably arranged in the connecting groove. The water pressure interface and the pressure relief port are arranged in the centering mechanism and the pressure testing blind plate. The sealing steel ring groove is arranged on the upper end surface of the pressure testing blind plate. The combined blowout preventer pressure testing device is stable and reliable, can cover all specifications of blowout preventers, is convenient and fast to operate, saves time and effort, has high dismounting and mounting efficiency, and has small operation risk.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment technology, specifically relating to a combined blowout preventer pressure testing device and its usage method. Background Technology

[0002] Blowout preventers are used to close the wellhead during operations such as oil testing, well workover, and well completion to prevent blowout accidents. They are a commonly used safety wellhead sealing device in oilfields to prevent blowouts.

[0003] Blowout preventers (BOPs) require regular inspection and testing to ensure proper functioning. During pressure testing, the BOP is installed on a pressure testing device, and high-pressure liquid is injected to observe for leaks and to determine the maximum pressure it can withstand.

[0004] Before using the pressure testing device, multiple pressure testing personnel need to enter the pressure testing pit to manually align it, which presents problems such as high labor intensity, cumbersome procedures, difficulty in aligning the sealing surface, low work efficiency, high risk of working at height, and high safety risks.

[0005] In the prior art, Chinese patent document CN201335778Y, published on October 28, 2009, discloses a special blind flange for blowout preventer (BOP) pressure testing. It mainly consists of a test tube threaded connection, a guide joint, a high-pressure channel, a positioning hole, and a blind flange. One side of the blind flange has a protruding guide joint, and the guide joint and the blind flange have a communicating high-pressure channel. The end of the blind flange has a positioning hole. This device can guide the BOP to sit safely and stably on the test flange and test clamp. However, because it is threadedly connected to the test tube, under long-term high-pressure load impact, slight slippage caused by vibration can easily occur, affecting the pressure test and potentially leading to loosening of the connection and causing a safety accident. Summary of the Invention

[0006] The purpose of this invention is to provide a combined blowout preventer (BOP) pressure testing device and its usage method. The pressure testing personnel can complete the installation work of the BOP before pressure testing outside the pressure testing risk area. The operation is convenient and quick, the pressure testing efficiency is high, and the operation risk is low.

[0007] The technical solution adopted in this invention is a combined blowout preventer (BOP) pressure testing device, including a pressure testing blind plate guide shoe and a pressure testing blind plate simulated drill string. The pressure testing blind plate guide shoe includes an automatic guiding mechanism, a centering mechanism, a pressure testing blind plate, a connecting groove, a water pressure interface and a pressure relief port, and a sealing steel ring groove. The automatic guiding mechanism is fixed to the top of the centering mechanism, which is located on the top of the pressure testing blind plate. The connecting groove is opened at the center of the automatic guiding mechanism and the centering mechanism. The lower end of the pressure testing blind plate simulated drill string is detachably installed in the connecting groove. The water pressure interface and the pressure relief port are both installed in the centering mechanism and the pressure testing blind plate. The sealing steel ring groove is opened on the upper surface of the pressure testing blind plate.

[0008] Preferably, the automatic guiding mechanism, the centering mechanism, and the pressure testing blind plate are an integrated structure.

[0009] Preferably, the centering mechanism is cylindrical and the automatic guiding mechanism is frustum-shaped.

[0010] Preferably, it further includes a locking mechanism, which includes a pin hole, a through hole and a positioning connecting pin. The pin hole is located at the lower end of the simulated drill string of the test pressure blind plate, the through hole is opened on the automatic guide mechanism, and the positioning connecting pin passes through the pin hole and the through hole.

[0011] Preferably, a sealing ring is also provided in the connecting groove. The sealing ring is sleeved on the test pressure blind plate simulated drill string. The sealing ring is located on the lower side of the positioning connecting pin. Two sealing rings are provided.

[0012] Preferably, one end of the water pressure interface is connected to the side of the through hole and the centering mechanism, and one end of the pressure relief port is connected to the bottom of the connecting groove.

[0013] Preferably, the automatic guiding mechanism is further provided with a backstop screw, which is arranged perpendicular to the axial direction of the positioning connecting pin, and the lower end of the backstop screw is in close contact with the positioning connecting pin.

[0014] Furthermore, the outer diameter of the test pressure blind plate simulating the drill string is 3. inch or 4 inches or 5 inches or 5 The test pressure blind plate simulates a drill string with a length of 1000mm to 1250mm.

[0015] Preferably, it also includes a blowout preventer gate, wherein the test pressure blind plate simulates the outer wall protrusion of the drill string to form a first step and a second step, the first step abuts against the upper end face of the automatic guide mechanism, the second step abuts against the blowout preventer gate, and the first step and the second step are also provided with chamfers, the chamfer angle being 70°.

[0016] The present invention also provides a method for using a combined blowout preventer pressure testing device, comprising the following steps: S1. Select the corresponding test pressure blind flange guide shoe, sealing steel ring groove and test pressure blind flange simulated drill string according to the blowout preventer's diameter and pressure rating; S2. Move the blowout preventer above the combined blowout preventer test device, slowly lower the blowout preventer, and bring the blowout preventer's pipe diameter close to the guide end face of the automatic guide mechanism. Under the action of the centering mechanism, centering is achieved. S3. The blowout preventer sealing steel ring groove is properly engaged with the sealing steel ring groove, the combined blowout preventer pressure test device is connected with the pressure test clamp, and the blowout preventer gate sealing rubber core hugs the pressure test blind plate to simulate the drill string to form a sealed cavity. S4. Pour water into the water pressure interface to conduct a pressure test.

[0017] The beneficial effects of this invention are as follows: The combined blowout preventer pressure testing device of the present invention is stable and reliable, can cover all specifications of blowout preventers in use, is convenient and quick to operate, saves time and effort, has high disassembly and installation efficiency, and has low operational risk.

[0018] This invention achieves automatic alignment through an automatic guiding mechanism and an alignment mechanism, eliminating the need for multiple employees to enter the pressure test pit for manual alignment. It is convenient, quick, time-saving, labor-saving, and has high efficiency in pressure testing and installation with low operational risks.

[0019] The test pressure blind flange guide shoe and test pressure blind flange simulated drill string of the present invention are available in various specifications. The corresponding test pressure blind flange guide shoe, sealing steel ring groove and test pressure blind flange simulated drill string can be selected according to the diameter and pressure level of the blowout preventer. The combination is diverse, covering a wide range of test pressure specifications, and the operation is simple and convenient.

[0020] This invention enables convenient disassembly and reassembly of the test pressure blind flange simulated drill string and the test pressure blind flange guide shoe through a locking mechanism. This facilitates the replacement of the test pressure blind flange simulated drill string with different specifications to meet the sealing requirements of the blowout preventer gate sealing core. A pressure relief hole is machined at the bottom of the test pressure blind flange guide shoe to facilitate observation of whether the sealing ring has failed, effectively avoiding the risk of breakage of the positioning connecting pin and improving the performance of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the combined blowout preventer pressure testing device of the present invention installed on the blowout preventer pressure testing clamp.

[0022] Figure 2 This is a schematic diagram of the structure of the present invention.

[0023] Figure 3 This is a cross-sectional view of the simulated drill string for the pressure test blind plate of the present invention.

[0024] Reference numerals: 1. Automatic guiding mechanism; 2. Centering mechanism; 3. Test pressure blind flange; 4. Connecting groove; 5. Water pressure interface; 6. Pressure relief port; 7. Sealing steel ring groove; 8. Locking mechanism; 81. Pin hole; 82. Through hole; 83. Positioning connecting pin; 9. Sealing ring; 10. Test pressure blind flange simulated drill string; 101. First step; 102. Second step; 11. Blowout preventer; 12. Test pressure clamp; 13. Anti-reverse screw. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] Example 1 like Figure 1 As shown, this combined blowout preventer pressure testing device includes a pressure testing blind plate guide shoe and a pressure testing blind plate simulated drill string 10. The pressure testing blind plate guide shoe includes an automatic guiding mechanism 1, a centering mechanism 2, a pressure testing blind plate 3, a connecting groove 4, a water pressure interface 5, a pressure relief port 6, and a sealing steel ring groove 7. The automatic guiding mechanism 1 is fixed to the top of the centering mechanism 2, and the centering mechanism 2 is located on the top of the pressure testing blind plate 3. The connecting groove 4 is opened at the center of the automatic guiding mechanism 1 and the centering mechanism 2. The lower end of the pressure testing blind plate simulated drill string 10 is detachably set in the connecting groove 4. The water pressure interface 5 and the pressure relief port 6 are both set in the centering mechanism 2 and the pressure testing blind plate 3. The sealing steel ring groove 7 is opened on the upper end face of the pressure testing blind plate 3.

[0027] During operation, the blowout preventer 11 is moved to the corresponding position by operating a crane. During the slow descent, the blowout preventer 11's diameter approaches the guide end face of the automatic guide mechanism 1. Under the action of the centering mechanism 2, centering is achieved, so that the blowout preventer's sealing steel ring groove and sealing steel ring groove 7 are properly engaged. The combined blowout preventer pressure testing device is connected to the pressure testing clamp 12. By operating the blowout preventer pressure testing clamp, the blowout preventer gate sealing rubber core is operated to tighten the pressure testing blind plate to simulate the drill string 10 to form a sealed cavity and complete the pressure test. The pressure testing personnel can complete the installation work of the blowout preventer 11 before pressure testing outside the pressure testing risk area. The operation is convenient and quick, saving time and effort, with high pressure testing and installation efficiency and low operation risk.

[0028] It should be noted that the aforementioned pressure testing clamp 12 and blowout preventer gate sealing core are existing technologies. The blowout preventer pressure testing clamp uses the piston rod of its double-headed hydraulic cylinder to drive the arc clamp on the clamp base to reciprocate, thereby automating the hoisting, clamping, setting, and pressure testing of the blowout preventer. The blowout preventer gate sealing core is used to achieve wellhead sealing and prevent leakage of oil, gas, and other media under high pressure.

[0029] Example 2 Based on Example 1, such as Figure 2As shown, in this embodiment, the centering mechanism 2 is cylindrical, and the automatic guiding mechanism 1 is frustum-shaped, with the inclined surface of the frustum serving as the guiding end face.

[0030] In one specific embodiment, the automatic guiding mechanism 1, the centering mechanism 2, and the pressure testing blind plate 3 of the present invention are an integrated structure.

[0031] The dimensions of the blowout preventer (BOP) are matched with the dimensions of the tubing, but the tubing sizes are not uniform; there are large-diameter tubing and small-diameter tubing. Consequently, the gate valve of the BOP is also not standardized; some gate valves are matched with large-diameter tubing, and some are matched with small-diameter tubing. Because the gate valve dimensions of the BOP are not uniform, the dimensions of the pressure testing equipment for testing the BOP are also different.

[0032] The specifications of the test pressure blind flange guide shoe of the present invention include three pressure levels: 21MPa, 35MPa, and 70MPa. The specifications of the sealing steel ring groove 7 include, but are not limited to, R54, BX158, BX159, and BX160. By switching the specifications of the test pressure blind flange guide shoe and the sealing steel ring groove 7, all blowout preventers 11 on site can be combined.

[0033] The specifications of the test blind flange simulating drill string 10 are: outer diameter 3... inch, 4-inch, 5-inch, 5 The length is 1000mm~1250mm (mm, millimeters). The specifications of drill string 10 are simulated by changing the test pressure blind flange to adapt to the sealing requirements of the blowout preventer gate sealant core.

[0034] Before operation, the corresponding test pressure blind plate guide shoe, sealing steel ring groove 7 and test pressure blind plate simulated drill string 10 can be selected according to the diameter and pressure level of the blowout preventer 11. The combined blowout preventer test device of the present invention has a variety of combinations, covers a full range of test pressure specifications, and is simple and convenient to operate.

[0035] Example 3 Based on Example 1 or Example 2, such as Figure 3 As shown, this combined blowout preventer testing device also includes a blowout preventer gate. The outer wall of the test blind plate simulates the drill string 10 and protrudes to form a first step 101 and a second step 102. The first step 101 abuts against the upper end face of the automatic guide mechanism 1, and the second step 102 abuts against the blowout preventer gate. The first step 101 and the second step 102 are used to prevent the test blind plate simulates the drill string 10 from sliding or falling off.

[0036] The aforementioned blowout preventer gate is existing technology. The hydraulically driven piston drives the blowout preventer gate to close or open, thereby sealing or opening the wellhead to achieve the purpose of sealing or opening the well.

[0037] The first step 101 and the second step 102 are also chamfered, with a chamfer angle of 70°.

[0038] In one specific embodiment, the outer diameter of the test blind flange simulated drill string 10 is 5 inches and the length is 1000 mm. The height of the first step 101 from the test blind flange 3 is 150 mm, and the height of the second step 102 from the test blind flange 3 is 520 mm.

[0039] Example 4 Based on Embodiment 1, this embodiment also includes a locking mechanism 8, such as... Figure 2 As shown, the locking mechanism 8 includes a pin hole 81, a through hole 82, and a positioning connecting pin 83. The pin hole 81 is located at the lower end of the test pressure blind plate simulated drill string 10, the through hole 82 is opened on the automatic guide mechanism 1, and the positioning connecting pin 83 passes through the pin hole 81 and the through hole 82.

[0040] The locking mechanism 8 enables the disassembly of the test pressure blind plate simulation drill string 10 and the test pressure blind plate guide shoe, facilitating the replacement of the specifications of the test pressure blind plate simulation drill string 10 to meet the sealing requirements of the blowout preventer gate sealing core.

[0041] Example 5 Based on embodiment 3, in this embodiment, one end of the water pressure interface 5 is connected to the through hole 82 and the side of the centering mechanism 2, and one end of the pressure relief port 6 is connected to the bottom of the connecting groove 4.

[0042] The automatic guide mechanism 1 is also provided with a backstop screw 13. The backstop screw 13 is set perpendicular to the axial direction of the positioning connecting pin 83. The lower end of the backstop screw 13 is tightly fitted with the positioning connecting pin 83, and the positioning connecting pin 83 is prevented from moving and falling off by the backstop screw 13.

[0043] A sealing ring 9 is also provided inside the connecting groove 4. The sealing ring 9 is sleeved on the test pressure blind plate simulated drill string 10 and is located below the positioning connecting pin 83. The sealing ring 9 seals the gap between the test pressure blind plate simulated drill string 10 and the test pressure blind plate guide shoe.

[0044] After prolonged use, the positioning pin 83 is prone to weakening. Analysis of the pressure concentration reveals that the liquid inside the blowout preventer 11 exerts an upward thrust on the bottom section of the test blind flange simulated drill string 10 under pressure. This thrust increases with water pressure, and it acts entirely on the positioning pin 83, thus creating a risk of deformation and breakage. To avoid this risk, two sealing rings are added between the test blind flange simulated drill string 10 and the test blind flange guide shoe to prevent pressure from the blowout preventer cavity from being transmitted to the bottom section of the test blind flange simulated drill string 10. A pressure relief port 6 is machined at the bottom of the test blind flange guide shoe to facilitate observation of whether the sealing ring 9 has failed. The outer circumference of the non-sealed area at the bottom of the test blind flange simulated drill string 10 is enlarged to form a step with the sealed area, using this step as a safety measure to prevent it from flying out.

[0045] Example 6 Based on Example 1, this example provides a method for using a combined blowout preventer pressure testing device, including the following steps: S1. Select the corresponding test pressure blind flange guide shoe, sealing steel ring groove 7 and test pressure blind flange simulated drill string 10 according to the diameter and pressure rating of the blowout preventer 11.

[0046] S2. Move the blowout preventer 11 above the combined blowout preventer test device, slowly lower the blowout preventer 11, and bring the blowout preventer 11 close to the guide end face of the automatic guide mechanism 1. Under the action of the centering mechanism 2, centering is achieved.

[0047] S3, the sealing steel ring groove of the blowout preventer 11 and the sealing steel ring groove 7 are in place, the combined blowout preventer pressure test device is connected to the pressure test clamp 12, and the blowout preventer gate sealing rubber core hugs the pressure test blind plate to simulate the drill string 10 to form a sealed cavity.

[0048] S4. Pour water into water pressure interface 5 to conduct a pressure test.

[0049] Components and structures not described in detail in the embodiments are well-known components, common structures or common means in the industry, and will not be described in detail here.

Claims

1. A combined blowout preventer pressure testing device, characterized in that, The combined blowout preventer pressure testing device includes a pressure testing blind plate guide shoe and a pressure testing blind plate simulated drill string (10). The pressure testing blind plate guide shoe includes an automatic guide mechanism (1), a centering mechanism (2), a pressure testing blind plate (3), a connecting groove (4), a water pressure interface (5), a pressure relief port (6), and a sealing steel ring groove (7). The automatic guide mechanism (1) is fixed to the top of the centering mechanism (2). The centering mechanism (2) is located on the top of the pressure testing blind plate (3). The connecting groove (4) is opened in the center of the automatic guide mechanism (1) and the centering mechanism (2). The lower end of the pressure testing blind plate simulated drill string (10) is detachably set in the connecting groove (4). The water pressure interface (5) and the pressure relief port (6) are both set in the centering mechanism (2) and the pressure testing blind plate (3). The sealing steel ring groove (7) is opened on the upper surface of the pressure testing blind plate (3).

2. The combined blowout preventer pressure testing device according to claim 1, characterized in that, The automatic guiding mechanism (1), the centering mechanism (2), and the pressure testing blind plate (3) are an integrated structure.

3. The combined blowout preventer pressure testing device according to claim 1, characterized in that, The centering mechanism (2) is cylindrical, and the automatic guiding mechanism (1) is frustum-shaped.

4. The combined blowout preventer pressure testing device according to claim 1, characterized in that, It also includes a locking mechanism (8), which includes a pin hole (81), a through hole (82) and a positioning connecting pin (83). The pin hole (81) is located at the lower end of the test pressure blind plate simulated drill string (10), the through hole (82) is opened on the automatic guide mechanism (1), and the positioning connecting pin (83) passes through the pin hole (81) and the through hole (82).

5. The combined blowout preventer pressure testing device according to claim 4, characterized in that, A sealing ring (9) is also provided in the connecting groove (4). The sealing ring (9) is sleeved on the test pressure blind plate simulated drill string (10). The sealing ring (9) is located on the lower side of the positioning connecting pin (83). There are two sealing rings (9).

6. The combined blowout preventer pressure testing device according to claim 5, characterized in that, One end of the water pressure interface (5) is connected to the side of the through hole (82) and the centering mechanism (2), and one end of the pressure relief port (6) is connected to the bottom of the connecting groove (4).

7. The combined blowout preventer pressure testing device according to claim 6, characterized in that, The automatic guide mechanism (1) is also provided with a backstop screw (13), which is set perpendicular to the axial direction of the positioning connecting pin (83), and the lower end of the backstop screw (13) is tightly fitted with the positioning connecting pin (83).

8. The combined blowout preventer pressure testing device according to claim 1, characterized in that, The outer diameter of the test pressure blind flange simulated drill string (10) is 3. inch or 4 inches or 5 inches or 5 The length of the test pressure blind plate simulated drill string (10) is 1000mm~1250mm.

9. The combined blowout preventer pressure testing device according to claim 1, characterized in that, It also includes a blowout preventer gate. The outer wall of the test pressure blind plate simulates the drill string (10) and forms a first step (101) and a second step (102). The first step (101) abuts against the upper end face of the automatic guide mechanism (1), and the second step (102) abuts against the blowout preventer gate. The first step (101) and the second step (102) are also provided with chamfers with an angle of 70°.

10. A method of using the combined blowout preventer pressure testing device as described in claim 1, characterized in that, Includes the following steps: S1. Select the corresponding test pressure blind flange guide shoe, sealing steel ring groove (7) and test pressure blind flange simulation drill string (10) according to the diameter and pressure rating of the blowout preventer. S2. Move the blowout preventer to the top of the combined blowout preventer test device, slowly lower the blowout preventer, and bring the blowout preventer bore close to the guide end face of the automatic guide mechanism (1). Under the action of the centering mechanism (2), centering is achieved. S3, the blowout preventer sealing steel ring groove and the sealing steel ring groove (7) are in place, the combined blowout preventer pressure test device is connected to the pressure test clamp, and the blowout preventer gate sealing rubber core hugs the pressure test blind plate to simulate the drill string (10) to form a closed cavity. S4. Pour water into the water pressure interface (5) to conduct a pressure test.

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