Oil casing field power compensation device and operation method

Abstract

The invention discloses an oil casing field power compensation device and an operation method. The device comprises a suspension part; one end of the displacement adjusting piece is connected with the suspension piece, and a connecting piece is fixed at the other end; the holding assembly is movably connected with the connecting piece; when the displacement adjusting piece lowers the holding assembly through the connecting piece, the holding assembly loosens the oil casing pipe body. When the displacement adjusting piece pulls the holding assembly upwards through the connecting piece, the holding assembly holds the oil casing pipe body tightly. The wellhead screwing-on auxiliary mechanism is convenient to operate on site, high in operation efficiency and capable of completely overcoming the influence of factors such as the gravity of an oil well pipe, wellhead misalignment, swing of a hook and wind power when screwing-on operation is conducted on threads of an oil well pipe body, the position of the oil well pipe can be easily adjusted in a small range at the wellhead, adjustment and screwing-on work can be completed by one operator, and the operation efficiency is greatly improved. And the buckling success rate is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of wellhead equipment for oil and gas development, and particularly relates to an on-site dynamic compensation device for oil and casing pipes and an operation method thereof. Background Art

[0002] With the further development of oil and gas exploration, many oil and gas fields in the western and southwestern regions of China have the characteristics of high temperature (greater than 140 °C), high pressure (greater than 100 MPa), deep well depth (greater than 5000 m), and high corrosion media (CO2, H2S, Cl-), which pose more stringent requirements on the performance of oil well pipes. At present, due to its excellent properties such as high strength, low density, excellent corrosion resistance, low elastic modulus, and resistance to seawater erosion, titanium alloy materials have been used to manufacture oil well pipes such as tubing, casing, and drill pipes, and have very excellent performance. The ultra-deep high-temperature and high-pressure gas well oil well pipe is a kind of oil well pipe specifically applied to the above-mentioned oil and gas fields. The main connection method of this oil well pipe is to use special threaded joints, and the quality of on-site threading directly affects the structural integrity and sealing integrity of the entire pipe string during service operation.

[0003] Due to the complex on-site operation environment, during the threading process, factors such as the self-weight of the oil well pipe, misalignment of the wellhead, swing of the traveling block, and wind force will affect the accuracy of the male thread of the oil well pipe entering the thread groove of the coupling, resulting in the problem of inability to accurately and efficiently align the threads. Especially for titanium alloy oil well pipes, due to the characteristics of the material itself, the thread surface is easily damaged and not wear-resistant. If problems such as inaccurate threading, wrong threading, insufficient or excessive threading torque occur during on-site operation, it will cause serious damage to the threads, further affecting the connection strength and sealing effect of the threaded joints. At the same time, due to the cask effect of special thread sealing, leakage and other failures are likely to occur first at the weak points, posing a great threat to the safety of the entire oil well pipe string. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art, and provides an on-site dynamic compensation device for oil and casing pipes and an operation method thereof.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] According to the first aspect of the present invention, an on-site dynamic compensation device for oil and casing pipes is provided, including:

[0007] A suspension member;

[0008] A displacement adjusting member, one end of which is connected to the suspension member, and the other end is fixedly provided with a connecting member;

[0009] A clamping assembly, which is movably connected to the connecting member;

[0010] Wherein, when the displacement adjusting member lowers the clamping assembly through the connecting member, the clamping assembly loosens the oil casing pipe body;

[0011] When the displacement adjusting member pulls up the clamping assembly through the connecting member, the clamping assembly clamps the oil casing pipe body.

[0012] Further, the clamping assembly includes a housing, the outer side of the housing is movably connected to the connecting member, a clamping member is movably connected to the inner side of the housing, and a friction block is provided on the inner side of the clamping member.

[0013] Further, the cross section of the friction block is arc-shaped.

[0014] Further, a plurality of the friction blocks are provided.

[0015] Further, the clamping member includes a slip split tooth body and a tooth body connecting member, a plurality of the slip split tooth bodies are provided, each slip split tooth body is provided with one of the friction blocks on its inner side, and adjacent slip split tooth bodies are connected by the tooth body connecting member.

[0016] Further, an elastic member is provided in the tooth body connecting member, and the elastic member is used to separate or coincide adjacent slip split tooth bodies in the circumferential direction.

[0017] Further, the elastic member is a spring.

[0018] Further, the displacement adjusting member is a cylinder.

[0019] Further, the suspension member is a hook.

[0020] According to the second aspect of the present invention, there is provided an operation method of an on-site power compensation device for an oil casing, and the method is carried out by using the compensation device as described above, including:

[0021] Install the components on the drilling equipment;

[0022] Pass the oil casing pipe body through the components on the drilling equipment;

[0023] Perform buttoning, guiding and threading operations on the threads of the oil casing pipe body passing through the components.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The on-site operation of the auxiliary device for screwing up the wellhead is convenient, with high operation efficiency. When screwing up the threads of the oil well pipe string, it can completely overcome the influence of factors such as the self-gravity of the oil well pipe, misalignment of the wellhead, swing of the hook, and wind force. Moreover, the position of the oil well pipe at the wellhead can be easily adjusted within a small range. One operator can complete the adjustment and screwing-up work, and the success rate of threading is high.

[0026] 2. The auxiliary device is simple to operate, has good stability, strong adaptability during the process of screwing up the oil well pipe at the wellhead, and will not add additional complex processes and equipment to the on-site operation of lowering the oil well pipe.

[0027] 3. The auxiliary device can not only meet the on-site use requirements of pipes of different sizes, but also be used for the screwing-up operations of different types of oil well pipes such as tubing, casing, drill pipes, and tools.

[0028] 4. The auxiliary device is safe and reliable during use, can significantly reduce the impact on the on-site environment, and is applicable to a variety of harsh working conditions and construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0030] Figure 1 Overall schematic diagram of the on-site power compensation device for oil casing provided by the present invention;

[0031] Figure 2 Schematic diagram of the separation of the housing and the split jaw teeth of the on-site power compensation device for oil casing provided by the present invention;

[0032] Figure 3 Assembly schematic diagram of the housing and the split jaw teeth of the on-site power compensation device for oil casing provided by the present invention;

[0033] Figure 4 Schematic diagram of the operation method process of the on-site power compensation device for oil casing provided by the present invention;

[0034] Figure 5 Flowchart of the operation method of the on-site power compensation device for oil casing provided by the present invention.

[0035] Among them: 1. Oil casing coupling; 2. Elevator; 3. Hook; 4. Cylinder; 5. Large load-bearing spring; 6. Safety slip; 7. Oil casing body; 8. Cylinder telescopic arm; 9. Housing; 10. Split jaw teeth; 11. Friction block; 12. Tooth connection piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following accompanying drawings. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0039] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0040] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0041] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] The following further describes the present invention in detail with reference to the accompanying drawings:

[0043] An embodiment of the present invention provides an on-site power compensation device and an operation method for oil casing pipes.

[0044] As Figure 1 shown, according to the first aspect of the present invention, an on-site power compensation device for oil casing pipes is provided, including: a suspension member; a displacement adjusting member, one end of which is connected to the suspension member and the other end of which is fixedly connected with a connecting member; a clamping assembly, which is movably connected to the connecting member; wherein, when the displacement adjusting member lowers the clamping assembly through the connecting member, the clamping assembly loosens the oil casing pipe body 7; when the displacement adjusting member pulls up the clamping assembly through the connecting member, the clamping assembly clamps the oil casing pipe body 7. Further, the suspension member is a hook 3, the displacement adjusting member is a cylinder 4, the connecting member is a large-load bearing tension spring 5, the hook 3 is used to connect with a lifting clamp 2, one end of the cylinder 4 is connected to the hook 3, and the other end is connected to the large-load bearing tension spring 5. The cylinder telescopic arm 8 of the cylinder 4 is used to pull up or lower the clamping assembly through the large-load bearing tension spring 5, so as to realize the clamping and loosening operations of the oil casing pipe body.

[0045] In this embodiment, the clamping assembly is a safety slip 6. The safety slip 6 includes a housing 9. The outside of the housing 9 is movably connected to the large-load bearing tension spring 5. A clamping member is movably connected to the inside of the housing 9. A friction block 11 is provided on the inside of the clamping member. Among them, the clamping member includes a split slip tooth body 10 and a tooth body connecting member 12. There are multiple split slip tooth bodies 10, and each split slip tooth body 10 is provided with a friction block 11 on the inside. Adjacent split slip tooth bodies 10 are connected by a tooth body connecting member 12. The cross-section of the friction block 11 is arc-shaped, which fits more closely with the oil casing pipe body 7. An elastic member is provided in the tooth body connecting member 12, and the elastic member is used to separate or coincide adjacent split slip tooth bodies 10 in the circumferential direction. Specifically, the elastic member is a spring.

[0046] Taking the oil casing pipe 7 with different wall thicknesses as an example, the following is an illustration.

[0047] Example 1:

[0048] When it is necessary to perform the operation of screwing on and lowering the 3-1 / 2 in oil casing body 7 (with a wall thickness of 7.34 mm) on-site, the weight of a single oil casing body 7 is calculated to be 150 kg. Among them, the large-load-bearing spring 5 adopts a mechanical spring energy storage structure. The load of the oil casing body 7 + the lower safety slip 6 is 155 kg. There are two large-load-bearing spring 5 assemblies in total. The maximum working load of a single large-load-bearing spring 5 is 120 kg. The self-weight of the oil casing body 7 is balanced with the tensile force of the spring. The calculated safety factor is 1.55, achieving the purpose of short-distance floating up and down of the oil casing body 7 near the wellhead tongs. The cylinder 4 uses a double-acting cylinder. The oil casing body 7 + the lower safety slip 6 + the large-load-bearing spring 5 is 160 kg. There are 2 cylinders 4 in a group. The maximum working tensile and lowering load of the selected cylinder 4 is 120 kg. The calculated safety factor is 1.5. The safety slip 6 is the key component to realize clamping and loosening of the oil casing body 7. The load of the oil casing body 7 is 150 kg. The selected load of the safety slip 6 is about 2500 kg, and the safety factor is greater than 15. A steel hook 3 is selected, and the load of a single hook 3 exceeds 200 kg. After arriving at the site, the hook 3, the cylinder 4, the large-load-bearing spring 5 and the safety slip 6 are assembled in order from top to bottom to form a set of compensation devices. Prepare two sets of compensation devices. Connect the two sets of compensation devices with the hook 3 on the platform elevator 2 (so that the cylinder 4 is in the extended state). Connect the two sets of compensation devices at the bottommost end with a safety slip 6 and use the elevator 2 to lift out the oil casing body 7, so that the oil casing body 7 passes through the single-power compensation device and the safety slip 6, and the oil casing coupling 1 is suspended above the wellhead elevator 2; lift the elevator 2, contract the cylinder 4 while the safety slip 6 automatically clamps the oil casing body 7 and lifts the oil casing body 7; at this time, the oil casing body 7 is in a zero-gravity state under the action of the large-load-bearing spring 5 of the on-site power compensation device, and the threads of the oil casing body 7 can be easily butt-jointed, guided, and screwed on; the cylinder 4 extends, and the cylinder 4 lowers the safety slip 6 on the on-site power compensation device of the oil casing body 7. The split tooth body 10 on the safety slip 6 slides along the conical surface of the housing 9 to loosen the oil casing body 7, and lower the oil casing body 7 that has been screwed on.

[0049] Embodiment 2:

[0050] When casing running operation needs to be carried out on the 7-6 / 8in casing body 7 (with a wall thickness of 15.11mm) at the site, among which, the large load-bearing spring 5 adopts a mechanical spring energy storage structure. The maximum working load of a single large load-bearing spring 5 is 520kg, and the load of the casing body 7 + the lower safety slips 6 is 685kg. Two large load-bearing springs 5 are used on the left and right. The self-weight of the casing body 7 is balanced with the tensile force of the large load-bearing spring 5, and the calculated safety factor is 1.52, achieving the purpose that the casing body 7 can float up and down in a short distance near the wellhead tongs. The cylinder 4 adopts a two-way acting cylinder. The pneumatic transmission mechanism converts the pressure of compressed air into mechanical energy to drive the linear reciprocating motion of the mechanism, mainly realizing the operation of clamping and releasing the casing body 7 by lifting and lowering. The load of the casing body 7 + the lower safety slips 6 + the large load-bearing spring 5 is 700kg. There is 1 cylinder 4 on each side. The maximum working tensile and lowering load of each cylinder 4 is 525kg, and the calculated safety factor is 1.5. The safety slips 6 is the key component to realize clamping and releasing the casing body 7. The safety slips 6 is composed of a housing 9 and 4 split slip teeth 10. Inside the split slip teeth 10, hard alloy high-friction blocks 11 are provided to hold the casing body 7 tightly without sliding. The inner wall of the housing 9 and the outer wall of the split slip teeth 10 are both conical. By lifting and lowering the cylinder 4, the casing dynamic compensation device is realized to hold or release the casing body 7. The load of the casing body 7 is 680kg, and the actual load of the safety slips 6 is about 2500kg, and the safety factor is greater than 3.5. Alloy steel hooks 3 are selected. The load of a single hook 3 exceeds 300kg. After arriving at the site, the hook 3, the cylinder 4, the large load-bearing spring 5 and the safety slips 6 are assembled in sequence from top to bottom to form a set of compensation device. Prepare 4 sets of compensation devices. Connect the 4 sets of compensation devices with the hook 3 on the platform elevator 2 (make the cylinder 4 in the extended state). At the bottom end of the 4 sets of compensation devices, connect them with a safety slips 6 and use the elevator 2 to lift out the casing body 7, so that the casing body 7 passes through a single set of dynamic compensation device and the safety slips 6, and the coupling of the casing body 7 is suspended above the wellhead elevator 2; lift the elevator 2, the cylinder 4 contracts and at the same time the safety slips 6 automatically clamps the casing body 7 and lifts the casing body 7; at this time, the casing body 7 is in a zero-gravity state under the action of the large load-bearing spring 5 of the casing on-site dynamic compensation device, and the threads of the casing body 7 can be easily butted, guided and made up; the cylinder 4 extends, lower the safety slips 6 on the casing on-site dynamic compensation device, and the split slip teeth 10 on the safety slips 6 slide along the conical surface to release the casing body 7, and lower the casing body 7 that has been made up.

[0051] According to the second aspect of the present invention, an operation method of a casing on-site dynamic compensation device is provided. The method is carried out by using the compensation device as described above, as Figure 5 shown, including:

[0052] S101. Install the components on the drilling equipment; select appropriate cylinder, load-bearing spring 5 and safety slip 6 models according to the specifications of the oil casing pipe body 7 and the operation requirements of special threads; assemble the hook 3, cylinder 4, load-bearing spring 5 and safety slip 6 in sequence from top to bottom to form a set of compensation devices, and prepare two sets of auxiliary mechanisms for compensation operation.

[0053] S102. Pass the oil casing pipe body through the components on the drilling equipment; connect two sets of compensation devices with the hook 3 on the platform elevator 2 (keep the cylinder body 4 in the extended state), and connect the two sets of compensation devices at the lowermost end with a safety slip 6; lift the oil casing pipe body 7 from the middle of the platform, and pass the oil casing pipe body 7 through the middle of the split slip teeth 10 of the safety slip 6. The elevator 2 grips the casing coupling 1 of the oil casing pipe body 7 and lifts it, and suspends it above the wellhead coupling.

[0054] S103. Perform operations of threading, guiding and screwing on the threads of the oil casing pipe body passing through the components. The cylinder 4 contracts to lift the safety slip 6, so that the split slip teeth 10 on the safety slip 6 slide along the conical surface to tightly hold the oil casing pipe body 7 and lift the oil casing pipe body 7; at this time, the oil casing pipe body 7 is in a zero-gravity state under the action of the large load-bearing spring 5, and the threads of the oil casing pipe body 7 can be easily threaded, guided and screwed; after screwing, the cylinder 4 extends, and the safety slip 6 on the wellhead screwing compensation device is lowered, and the split slip teeth 10 on the safety slip 6 slide along the conical surface to release the oil casing pipe body 7.

[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A field power compensation device for oil casing pipes, characterized in that Comprising: A suspension member; A displacement adjusting member, one end of which is connected to the suspension member and the other end of which is fixed with a connecting member; A clamping assembly, which is movably connected to the connecting member; Wherein, when the displacement adjusting member lowers the clamping assembly through the connecting member, the clamping assembly loosens the oil casing pipe body; When the displacement adjusting member pulls up the clamping assembly through the connecting member, the clamping assembly clamps the oil casing pipe body.

2. The compensation device according to claim 1, wherein The clamping assembly includes a housing, the outer side of the housing is movably connected to the connecting member, a clamping member is movably connected to the inner side of the housing, and a friction block is arranged on the inner side of the clamping member.

3. The compensation device according to claim 2, wherein The cross-section of the friction block is arc-shaped.

4. The compensation device according to claim 2 or 3, characterized in that, A plurality of the friction blocks are provided.

5. The compensation device according to claim 2, wherein The clamping member includes a slip split tooth body and a tooth body connecting member. A plurality of the slip split tooth bodies are provided, and each slip split tooth body is provided with one of the friction blocks on its inner side. Adjacent two of the slip split tooth bodies are connected by the tooth body connecting member.

6. The compensation device according to claim 5, characterized in that, An elastic member is arranged in the tooth body connecting member, and the elastic member is used for separating or coinciding adjacent two of the slip split tooth bodies in the circumferential direction.

7. The compensation device according to claim 6, characterized in that The elastic member is a spring.

8. The compensation device according to claim 1, wherein The displacement adjusting member is a cylinder (4).

9. The compensation device according to claim 1, characterized in that The suspension member is a hook (3).

10. A method for operating an on-site power compensation device for oil casing pipes, characterized in that, The method is carried out by using the compensation device according to any one of claims 1-9, and includes: Installing the components on the drilling equipment; Passing the oil casing pipe body through the components on the drilling equipment; Performing operations of butt joint, lead-in joint and make-up joint on the threads of the oil casing pipe body passing through the components.

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