Blowout preventer hang-off pressure testing tool and method

Abstract

The application discloses a blowout preventer suspension type pressure testing tool and method, which comprises a cup seal packer, a suspension body and a cup seal packer center body. The cup seal packer is sleeved on the outer wall of the cup seal packer center body and is located below the suspension body. The upper end of the cup seal packer center body is suspended on the suspension body, and the suspension body is provided with an axial pressure transmission channel. The application can make the pressure testing pressure and the weight of the pipe column all act on the suspension body, effectively change the force of the pipe column during the blowout preventer pressure testing, improve the construction safety, and improve the success rate and accuracy of the blowout preventer pressure testing.

Description

Technical Field

[0001] This invention relates to the field of pressure testing technology in the petroleum industry, specifically to a suspended pressure testing tool and method for blowout preventers. Background Technology

[0002] Statistics show that the annual well workover workload at Shengli Oilfield is increasing year by year. According to Shengli Oilfield's well control requirements, on-site pressure testing of the well control equipment is mandatory before any work operation. Currently, the commonly used method is to lower the packer below the wellhead and use a pump truck to test the blowout preventer (BOP). During the test, the threads of the suspension device are subjected to significant load due to pressure, especially in deep pumping wells. When conducting high-pressure tests, the tubing string is prone to falling into the well, posing a safety hazard, affecting the success rate of the BOP test, and increasing work operation costs. Current BOP testing tools use slips to clamp the casing, distributing some of the pressure to the casing, but this method still has problems such as low pressure-bearing capacity, easy damage to the casing, and complex structure. To address these issues, a suspended BOP testing method is being developed. This method allows the test pressure and tubing string weight to act entirely on the suspension device, effectively changing the stress on the tubing string during BOP testing, improving construction safety, and increasing the success rate and accuracy of BOP testing. It has good prospects for widespread application.

[0003] CN202120867373.4 relates to a wellhead blowout preventer pressure testing device with anti-fall function. This patent uses slips to anchor the casing, distributing the weight of the tubing string and the piston thrust of the high-pressure liquid to the device itself and the casing, thereby improving the safety of the blowout preventer pressure testing process.

[0004] The shortcomings of this comparative literature are: the traditional slip anchoring method has low pressure resistance, the slips are prone to damaging the casing, and the structure is complex.

[0005] Patent CN201020199106.6 relates to a special pressure testing tool for blowout preventers. This patent consists of a tapered plug, a center rod, a safety baffle, an oil pipe short section, and a fluid orifice. The tapered plug is cylindrical with a cone at the bottom. The cylinder wall has external threads for the oil pipe, making the plug and the oil pipe short section a single unit, thus shortening the pressure testing operation time.

[0006] The shortcomings of this comparative literature are: it can only test the partial seal of the blowout preventer, and cannot test the full seal of the blowout preventer and the casing head, which does not meet the pressure testing requirements of oilfield blowout preventers.

[0007] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0008] To address the aforementioned deficiencies in the existing technology, the purpose of this invention is to provide a suspended pressure testing tool and method for blowout preventers (BOPs), which allows the test pressure and the weight of the tubing to act entirely on the suspension device, effectively changing the stress on the tubing during BOP testing, improving construction safety, and increasing the success rate and accuracy of BOP testing.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A blowout preventer suspension pressure testing tool, including a cup packer;

[0011] It also includes the suspension body and the central body of the cup sealer;

[0012] The leather cup packer is fitted onto the outer wall of the central body of the leather cup packer, and the leather cup packer is located below the suspension body;

[0013] The upper end of the central body of the cup packer is suspended on a suspension body, and the suspension body has an axially penetrating pressure transmission channel.

[0014] Furthermore, it also includes a suspension clamping mechanism, wherein the upper end of the central body of the cup packer is suspended on the suspension body through the suspension clamping mechanism.

[0015] Furthermore, the suspension clamping mechanism includes an inner locking slip;

[0016] The inner wall of the suspension body is provided with a first axial limiting platform, the inner wall of the inner clasp is provided with a second axial limiting platform, and the outer wall of the upper end of the center body of the cup packer is provided with a third axial limiting platform. The lower end face of the inner clasp is engaged with the first axial limiting platform, and the second axial limiting platform and the third axial limiting platform are engaged with each other.

[0017] Furthermore, it also includes an upper connector, the lower end of which is provided with a pressure cap structure, the outer wall of the pressure cap structure is threadedly connected to the inner wall of the suspension body, and the lower end face of the pressure cap structure presses against the inner collet.

[0018] Furthermore, the central body of the cup sealer is a solid structure.

[0019] Furthermore, the cup packer includes a cup, a cup seat, and an adjusting pressure ring. The outer wall of the central part of the cup packer is provided with a fourth axial limiting platform for cooperating with the cup seat and a fifth axial limiting platform for cooperating with the adjusting pressure ring.

[0020] To achieve the above objectives, the present invention adopts the following technical solution:

[0021] A method for using a blowout preventer suspension pressure testing tool includes the following steps:

[0022] During the full seal pressure test, the full seal is closed, and the pressure test pump pressurizes from the casing. Because the pressure cap structure at the lower end of the upper connector and the central body of the cup packer are solid structures, the pressure cannot be transmitted to the inside of the tubing, so the tubing is not pressurized. The pressure is transmitted upward through the pressure test channel to the bottom of the full seal of the blowout preventer at the wellhead.

[0023] At the same time, the pressure is transmitted to the lower diaphragm, which expands further, the sealing oil sleeve is annular, and the tension generated by the diaphragm is transmitted to the suspension body through the central body of the diaphragm packer and the inner slip;

[0024] During the pressure test, the pressure and weight of the tubing are transferred to the suspension body. The pressure-bearing capacity of the suspension body is much higher than the tensile strength of the threads, ensuring the safety of the pressure test and completing the full-sealing pressure test.

[0025] Furthermore, it also includes the following steps:

[0026] During the partial seal pressure test, a tubing short section that matches the half seal of the blowout preventer is connected to the upper joint. The half seal is closed to hold the tubing short section, and the pressure test pump pressurizes from the casing. The pressure is transmitted upward through the pressure test channel to the bottom of the half seal of the blowout preventer at the wellhead.

[0027] At the same time, the pressure is transmitted to the lower diaphragm, which expands further, the sealing oil sleeve is annular, and the tension generated by the diaphragm is transmitted to the suspension body through the central body of the diaphragm packer and the inner slip;

[0028] The test pressure and the weight of the tubing were transferred to the suspension body, completing the semi-sealed pressure test.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. This tool adopts a suspended sealing integrated structure, which has high pressure resistance and reliable structure;

[0031] 2. The blowout preventer suspension pressure testing tool has a solid structure. During the pressure test, the pressure does not act inside the tubing. The tension generated by the inner cup of the tubing annulus is transferred to the suspension, so that the pressure test and the weight of the tubing are all acting on the suspension. This solves the problems of low pressure bearing capacity and easy damage to the tubing of the current slip-type pressure testing tool, and improves the safety of the pressure testing construction and the success rate of the blowout preventer pressure test.

[0032] 3. The blowout preventer suspension pressure test tool has a built-in pressure transmission channel, which allows the test pressure to be transmitted to the space above the packer through the test pressure channel, so as to realize the packer pressure test function.

[0033] 4. No need to repeatedly disassemble the hanger, resulting in high construction efficiency;

[0034] 5. Simple structure and easy maintenance. Attached Figure Description

[0035] Figure 1This is a schematic diagram of the structure of a blowout preventer suspension pressure testing tool proposed in this invention.

[0036] In the diagram: 1. Upper connector; 2. Suspension body; 3. Inner slip; 4. Pressure transmission channel; 5. Leather cup packer center body; 6. Adjusting pressure ring; 7. Leather cup; 8. Leather cup seat. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1:

[0039] Please see Figure 1 The present invention provides a technical solution:

[0040] A blowout preventer suspension pressure testing tool, including a cup packer;

[0041] It also includes the suspension body 2 and the central body of the leather cup packer 5;

[0042] The leather cup packer is fitted onto the outer wall of the central body of the leather cup packer, and the leather cup packer is located below the suspension body;

[0043] The upper end of the central body of the cup packer is suspended on the suspension body, and the suspension body has an axially penetrating pressure transmission channel 4.

[0044] Furthermore, it also includes a suspension clamping mechanism, wherein the upper end of the central body of the cup packer is suspended on the suspension body through the suspension clamping mechanism.

[0045] Furthermore, the suspension clamping mechanism includes an inner clamp 3;

[0046] The inner wall of the suspension body is provided with a first axial limiting platform, the inner wall of the inner clasp is provided with a second axial limiting platform, and the outer wall of the upper end of the center body of the cup packer is provided with a third axial limiting platform. The lower end face of the inner clasp is engaged with the first axial limiting platform, and the second axial limiting platform and the third axial limiting platform are engaged with each other.

[0047] Furthermore, it also includes an upper connector 1, the lower end of which is provided with a pressure cap structure, the outer wall of the pressure cap structure is threadedly connected to the inner wall of the suspension body, and the lower end face of the pressure cap structure presses against the inner collet.

[0048] Furthermore, the central body of the cup sealer is a solid structure.

[0049] Furthermore, the leather cup packer includes a leather cup 7, a leather cup seat 8, and an adjusting pressure ring 6. The outer wall of the central body of the leather cup packer is provided with a fourth axial limiting platform for cooperating with the leather cup seat and a fifth axial limiting platform for cooperating with the adjusting pressure ring.

[0050] The upper connector 1 is provided with a pressure cap structure at the lower part, which is connected to the suspension body 2 by threads. After tightening, it can press the inner clasp 3 and the cup packer center body 5. The test pressure channel 4 is located on the suspension body 2. The cup packer center body 5 is a solid structure with a suspension step on the top and a lower connector thread on the bottom. The suspension step of the cup packer center body 5 sits on the inner clasp 3. There are two inner clasps 3, which are seated in the suspension body 2 and hold the suspension step below. The adjusting pressure cap 6, cup 7, and cup pad 8 are fitted on the cup packer center body 5. The adjusting pressure cap 6 is connected to the cup packer 5 by threads and is used to press the cup 7 and cup pad 8.

[0051] The assembly method of the blowout preventer (BOP) suspended pressure testing tool is as follows: The cup 7 and cup seat 8 are fitted onto the cup packer center body 5. The cup 7 and cup seat 8 are pressed down by tightening the adjusting pressure ring 6. The assembly formed by the cup packer center body 5, adjusting pressure ring 6, cup 7, and cup seat 8 is then inserted into the suspension body 2. The lower end face of the suspension step on the cup packer center body 5 is higher than the upper end face of the suspension body 2, allowing the inner slips 3 to be inserted into the suspension body 2. The two inner slips 3 are then tightly secured to the tubing below the suspension step within the suspension body 2. The male thread below the upper connector 1 is aligned with the female thread on the suspension body 2 and tightened, pressing down the cup packer center body 5. The BOP suspended pressure testing tool is then assembled using the above steps. Before the BOP pressure test, the original wellhead hanger is removed, and the BOP suspended pressure testing tool is placed in the wellhead, the set screw is tightened, and the BOP is installed. During the full seal pressure test, the BOP is fully closed, and the pressure test pump pressurizes from the casing. Because the BOP suspension pressure test tool is a solid structure, the pressure cannot be transmitted to the inside of the tubing, so the tubing is not pressurized. The pressure is transmitted to the bottom of the full seal through the pressure test channel 4, and at the same time, the pressure is transmitted to the piston cup 7. The piston cup 7 expands further, sealing the annulus of the tubing. The tension generated by the piston cup 7 is transmitted to the suspension body 2 through the piston cup packer center body 5 and the inner slip 3. During the pressure test, the pressure test pressure and the weight of the tubing string are all transferred to the suspension body 2. The pressure bearing capacity of the suspension body 2 is much higher than the tensile strength of the thread, ensuring the safety of the pressure test and completing the full seal pressure test. During the partial seal pressure test, a tubing short section that matches the partial seal of the BOP is connected to the upper connector 1. The partial seal of the BOP is closed, the tubing short section is held, and the pressure test pump pressurizes from the casing. The pressure is transmitted to the bottom of the partial seal of the BOP through the pressure test channel 4. The pressure test pressure and the weight of the tubing string are all transferred to the suspension body 2, completing the partial seal pressure test.

[0052] A blowout preventer (BOP) is installed at the wellhead to close the wellhead during operations such as well testing, well workover, and well completion, preventing blowout accidents. It generally includes partial and full seal types and is a commonly used safety sealing device in oilfields to prevent blowouts. Broadly speaking, a full seal refers to a full seal BOP; more specifically, a full seal refers to the full seal gate of a BOP. Similarly, broadly speaking, a partial seal refers to a partial seal BOP; more specifically, a partial seal refers to the half seal gate of a BOP. These are existing technical terms and will not be elaborated further.

[0053] This blowout preventer suspension pressure testing tool adopts an integrated suspension and sealing structure. Through the suspension structure, the test pressure and the weight of the tubing are all applied above the suspension device, which improves the safety of the pressure testing construction. The structure is simple and effectively improves the construction efficiency and success rate.

[0054] Example 2:

[0055] Please see Figure 1 The present invention provides a technical solution:

[0056] A blowout preventer suspension pressure testing tool, including a cup packer;

[0057] It also includes the suspension body 2 and the central body of the leather cup packer 5;

[0058] The leather cup packer is fitted onto the outer wall of the central body of the leather cup packer, and the leather cup packer is located below the suspension body;

[0059] The upper end of the central body of the cup packer is suspended on the suspension body, and the suspension body has an axially penetrating pressure transmission channel 4.

[0060] Furthermore, it also includes a suspension clamping mechanism, wherein the upper end of the central body of the cup packer is suspended on the suspension body through the suspension clamping mechanism.

[0061] Furthermore, the suspension clamping mechanism includes an inner clamp 3;

[0062] The inner wall of the suspension body is provided with a first axial limiting platform, the inner wall of the inner clasp is provided with a second axial limiting platform, and the outer wall of the upper end of the center body of the cup packer is provided with a third axial limiting platform. The lower end face of the inner clasp is engaged with the first axial limiting platform, and the second axial limiting platform and the third axial limiting platform are engaged with each other.

[0063] Furthermore, it also includes an upper connector 1, the lower end of which is provided with a pressure cap structure, the outer wall of the pressure cap structure is threadedly connected to the inner wall of the suspension body, and the lower end face of the pressure cap structure presses against the inner collet.

[0064] Furthermore, the central body of the cup sealer is a solid structure.

[0065] Example 3:

[0066] Please see Figure 1The present invention provides a technical solution:

[0067] A blowout preventer suspension pressure testing tool, including a cup packer;

[0068] It also includes the suspension body 2 and the central body of the leather cup packer 5;

[0069] The leather cup packer is fitted onto the outer wall of the central body of the leather cup packer, and the leather cup packer is located below the suspension body;

[0070] The upper end of the central body of the cup packer is suspended on the suspension body, and the suspension body has an axially penetrating pressure transmission channel 4.

[0071] Furthermore, it also includes a suspension clamping mechanism, wherein the upper end of the central body of the cup packer is suspended on the suspension body through the suspension clamping mechanism.

[0072] Although all the above embodiments use Figure 1 However, those skilled in the art will clearly understand that separate drawings are not necessary; simply removing missing components or structural features from the drawings is sufficient. This is clear to those skilled in the art. Of course, embodiments with more components are merely optimal embodiments, while embodiments with fewer components are basic embodiments, but all can achieve the basic objectives of the present invention. Therefore, all these modified embodiments are within the scope of protection of the present invention.

[0073] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field and will not be elaborated upon further. Examples include welding and threaded connections.

[0074] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0076] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A blowout preventer suspension type pressure testing tool, comprising a cup packer; characterized in that Further comprising a suspension body, a cup packer center body; The cup packer is sleeved on the outer wall of the cup packer center body, and the cup packer is located below the suspension body; The upper end of the cup packer center body is suspended on the suspension body, and the suspension body is provided with an axial pressure transmission channel; Further comprising a suspension clamping mechanism, the upper end of the cup packer center body is suspended on the suspension body through the suspension clamping mechanism; The suspension clamping mechanism comprises an inner slip; The inner wall of the suspension body is provided with a first axial limiting platform, the inner wall of the inner slip is provided with a second axial limiting platform, and the outer wall of the upper end of the cup packer center body is provided with a third axial limiting platform; the lower end surface of the inner slip is clamped with the first axial limiting platform, and the second axial limiting platform is clamped with the third axial limiting platform; Further comprising an upper joint, the lower end of the upper joint is provided with a pressure cap structure, the outer wall of the pressure cap structure is connected with the inner wall of the suspension body in a screw thread type, and the lower end surface of the pressure cap structure is pressed against the inner slip; The cup packer center body is a solid structure; The inner slip is two, which is seated in the suspension body and holds the third axial limiting platform; The cup packer comprises a cup, a cup seat and an adjusting pressure ring, the outer wall of the cup packer center body is provided with a fourth axial limiting platform for matching the cup seat and a fifth axial limiting platform for matching the adjusting pressure ring.

2. A method of using a blowout preventer hang-off pressure testing tool, the method comprising: The use of the blowout preventer suspension type pressure testing tool of claim 1 comprises the following steps: When the blowout preventer is fully sealed for pressure testing, the blowout preventer is fully sealed, the testing pump is pressed from the casing, the pressure cannot be transmitted to the inside of the tubing due to the pressure cap structure at the lower end of the upper joint and the solid structure of the cup packer center body, so that the tubing is not under pressure, and the pressure is transmitted upward to the lower side of the blowout preventer through the pressure transmission channel; At the same time, the pressure is transmitted to the cup, the cup is further expanded, the annulus of the cup is sealed, and the tension generated by the cup is transmitted to the suspension body through the cup packer center body and the inner slip; During the pressure testing process, the testing pressure and the weight of the pipe string are all transferred to the suspension body, the pressure bearing capacity of the suspension body is much higher than the tensile capacity of the screw thread, which ensures the safety of the pressure testing and completes the pressure testing of the blowout preventer.

3. The method of using a blowout preventer hang-off pressure testing tool of claim 2, wherein, Further comprising the following steps: When the blowout preventer is semi-sealed for pressure testing, a tubing spool matched with the blowout preventer is connected with the upper joint, the blowout preventer is semi-sealed to hold the tubing spool, the testing pump is pressed from the casing, and the pressure is transmitted to the lower side of the blowout preventer through the pressure transmission channel; The testing pressure and the weight of the pipe string are all transferred to the suspension body, and the pressure testing of the blowout preventer is completed.

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