Waterproof casing pipe for petroleum drilling and lowering equipment of waterproof casing pipe

Abstract

The invention provides a drill conductor for petroleum drilling, which comprises a pipe body and a cohesion tile, the end part of the pipe body is of a step structure, a plurality of grooves are formed in the side wall with a smaller diameter, and a plurality of raised lines are arranged on the inner wall of the cohesion tile; the lowering equipment is installed in the iron support and comprises a clamping mechanism and a hoisting mechanism, a cable extending from the hoisting mechanism is fixedly connected with the clamping mechanism, the clamping mechanism comprises a main body, a through hole is formed in the middle of the main body, first hydraulic cylinders are fixedly connected to the two sides of the upper portion of the main body in a mirror image mode relative to the through hole, and the first hydraulic cylinders are fixedly connected with the hoisting mechanism. A first clamping block is fixedly connected to the output end of the first hydraulic cylinder, second hydraulic cylinders are fixedly connected to the two sides of the lower portion of the main body in a mirroring mode relative to the through hole, and a second clamping block is fixedly connected to the output ends of the second hydraulic cylinders. According to the invention, through the clamping mechanism, the pipe body is lowered in the drilling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling, in particular to a water isolation casing for oil drilling and a lowering device thereof. BACKGROUND

[0002] Oil drilling is a complex and high-risk large-scale engineering operation, and its core purpose is to drill the earth's crust to find, evaluate and exploit oil and gas resources in the deep underground. In order to maintain the stability of the drilling hole and avoid the intersection of non-target strata and well fluid, a water isolation casing is generally lowered during drilling. The type of water isolation casing is permanent and detachable, depending on whether it can be removed from the well, and the permanent water isolation casing is not removed from the well, and the water isolation casings are generally connected by welding.

[0003] The lowering of the water isolation casing is generally lowered with the drilling, and the welded water isolation casing is relatively simple, and the following problems exist during drilling: 1. The water isolation casing is relatively simple, and no guiding mechanism is provided after welding; 2. After the welding between the water isolation casings is completed, it is directly lowered into the well, and the welded part is not protected; 3. If the surface of the water isolation casing is relatively flat, it is not convenient to vertically hoist, and if a convex ring is provided, it will affect the lowering in the well; 4. When the water isolation casing is difficult to lower, the drilling operation needs to be stopped to solve the problem of lowering the water isolation casing.

[0004] For another type of water isolation casing, specifically, after drilling to a certain depth, the water isolation casing is installed and lowered, and this operation mode is not simultaneous with drilling and lowering, which affects the efficiency of drilling. SUMMARY

[0005] In order to solve the above problems, the present application discloses a water isolation casing for oil drilling, which comprises a pipe body and a clamping tile, the end of the pipe body is a stepped structure, and a plurality of grooves are arranged on the sidewall of the smaller diameter, the inner wall of the clamping tile is provided with a plurality of convex strips, and the convex strips and the grooves are matched, and the curvature of the clamping tile is equal to the curvature of the maximum diameter section of the pipe body. Two pipe bodies are connected and fixed by welding, and after welding, the clamping tile is wrapped, and the clamping tiles are also fixed by welding, which can protect the welding between the pipe bodies, and ensure that the outer side of the water isolation casing is flat, which is beneficial to the lowering of the water isolation casing.

[0006] A lowering device for a water isolation casing for oil drilling is installed in the interior of an iron stand, comprising a clamping mechanism and a winch mechanism, the winch mechanism is fixed to the upper part of the iron stand, and the extending cable and the clamping mechanism are fixedly connected. Through the winch mechanism, the lifting of the clamping mechanism is realized.

[0007] The clamping mechanism comprises a main body, a through hole is arranged in the middle of the main body, first hydraulic cylinders are fixedly connected on both sides of the upper part of the main body in mirror image relative to the through hole, first clamping blocks are fixedly connected to the output ends of the first hydraulic cylinders, second hydraulic cylinders are fixedly connected on both sides of the lower part of the main body in mirror image relative to the through hole, second clamping blocks are fixedly connected to the output ends of the second hydraulic cylinders, anti-skid strips are arranged on the side walls of the second clamping blocks, and the anti-skid strips are matched with the grooves.

[0008] Preferably, a cover plate is fixedly connected to the upper end of the main body, and hydraulic impact hammers are fixedly connected to both sides of the upper end of the cover plate. The cover plate seals the upper end of the main body, and the hydraulic impact hammers generate downward impact force when working, facilitating the lowering of the marine riser.

[0009] Preferably, the hydraulic impact hammer comprises a cylindrical shell, an end plate is fixedly connected to the lower end of the shell, a chamber is arranged in the shell, a piston is slidingly arranged in the chamber, a spring is arranged at the lower end of the piston, the lower end of the spring abuts against the end plate, and an oil channel is arranged in the shell and communicates with the chamber. Hydraulic oil is injected into the chamber through the oil channel, and then the piston moves downward and impacts on the end plate, so that downward impact force is generated, and the spring is used for resetting the piston.

[0010] Preferably, the lower device further comprises a hydraulic supply device, the input end of a hydraulic pump in the hydraulic supply device draws hydraulic oil from an oil tank, a pipeline is arranged between the output end of the hydraulic pump and the oil tank, an overflow valve and a stop valve are sequentially arranged on the pipeline, a branch is arranged on the pipeline and communicates with the oil channel, and the branch is located between the overflow valve and the stop valve. During operation, the hydraulic oil circulates between the oil tank and the hydraulic pump, the stop valve is suddenly closed, at this time, the hydraulic oil flows into the chamber, forcing the piston to generate downward impact force, and water hammer effect is generated here.

[0011] Preferably, connecting pieces are fixedly connected to both ends of the main body, lifting rings are fixedly connected to the connecting pieces, and the cables of the winch mechanism are fixedly connected to the lifting rings. The clamping mechanism is lifted and lowered from both sides.

[0012] Preferably, guide holes are arranged on the connecting pieces, guide rods are fixedly connected in the iron stand, and the guide rods are slidingly matched in the guide holes. The arrangement of the guide rods and the guide holes ensures the verticality of the lowering of the marine riser.

[0013] The beneficial effects of the present application are as follows: 1. The recess is arranged at the end of the pipe body, facilitating the clamping of the clamping mechanism, and in addition, after the welding between the two pipe bodies is completed, the recess is also clamped and welded with a clamping tile, which not only improves the flatness of the overall surface of the water isolation sleeve, facilitates the lowering of the water isolation sleeve, but also protects the welding between the two pipe bodies.

[0014] 2. The second hydraulic cylinder and the second clamping block in the clamping mechanism are arranged to clamp the recess at the end of the pipe body, and under the action of the guide rod, the vertical lowering of the water isolation sleeve can be realized, and the stable lowering of the water isolation sleeve can be realized.

[0015] 3. The hydraulic impact hammer is arranged, and when the water isolation sleeve encounters difficulties during lowering, the hydraulic impact hammer works to generate a downward impact force for lowering the water isolation sleeve, which greatly reduces the probability of stopping the drill pipe to handle the water isolation sleeve, and ensures the efficiency of construction.

[0016] 4. The first hydraulic cylinder and the first clamping block are arranged in the clamping mechanism to clamp the drill pipe for extension operation, realizing the multi-function of the clamping mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of a drilling platform; Figure 2 is an explosion schematic view of the connection of the water isolation sleeve of the present application; Figure 3 is a sectional view of the connection of the water isolation sleeve of the present application; Figure 4 is a three-dimensional schematic view of the clamping mechanism of the present application; Figure 5 is an explosion schematic view of the clamping mechanism of the present application; Figure 6 is a structural schematic view of the first hydraulic cylinder of the present application; Figure 7 is a structural schematic view of the second hydraulic cylinder of the present application; Figure 8 is a sectional view of the hydraulic impact hammer of the present application.

[0018] LIST OF REFERENCE NUMBERS: 1. iron stand; 2. water isolation sleeve; 3. drill pipe; 4. guide rod; 5. clamping mechanism; 6. top drive drilling device; 7. hoisting mechanism; 21. clamping tile; 22. recess; 23. pipe body; 51. main body; 52. cover plate; 53. hydraulic impact hammer; 54. lifting ring; 55. connecting piece; 56. first hydraulic cylinder; 57. second hydraulic cylinder; 58. first clamping block; 59. second clamping block; 510. anti-skid strip; 531. end plate; 532. shell; 533. piston; 534. spring; 535. oil channel. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] like Figures 1 to 3 As shown, a water-proof casing 2 for oil drilling includes a pipe body 23 and a retaining plate 21. The end of the pipe body 23 has a stepped structure and a welded bevel. Two pipe bodies 23 are connected by welding, achieving both connection and waterproofing. Several grooves 22 are provided on the side wall with a smaller diameter. Several raised strips are provided on the inner wall of the retaining plate 21, and these raised strips cooperate with the grooves 22. Furthermore, the edge of the retaining plate 21 also has a welded bevel and is fixed by welding. The curvature of the retaining plate 21 is equal to the curvature of the largest diameter section of the pipe body 23, meaning the outer diameter of the assembly formed by several retaining plates 21 is equal to the diameter of the largest diameter section of the pipe body 23. The retaining plate 21 not only allows for the inner welding but also ensures a smooth transition between the two pipe bodies 23, resulting in good surface consistency of the water-proof casing 2 and facilitating its lowering.

[0021] like Figures 1 to 8 As shown, a device for lowering a water-proof casing 2 for oil drilling is installed inside an iron frame platform 1. The iron frame platform 1 is a metal frame on the outside of the drilling platform that supports and fixes related equipment. It includes a clamping mechanism 5 and a hoisting mechanism 7. The hoisting mechanism 7 is fixed to the upper part of the iron frame platform 1, and the extended cable is fixedly connected to the clamping mechanism 5. When the hoisting mechanism 7 works, it realizes the lifting and lowering of the clamping mechanism 5.

[0022] The clamping mechanism 5 comprises a main body 51 which is in the shape of a rod as a whole, thicker in the middle and thinner at both ends, and a through hole is arranged in the middle of the main body 51 for the insertion of the water-proof casing 2 and the drill pipe 3, and first hydraulic cylinders 56 are fixedly connected to both sides of the upper part of the main body 51 in mirror image with respect to the through hole, the output ends of the first hydraulic cylinders 56 are fixedly connected with first clamping blocks 58, and when the first hydraulic cylinders 56 work, the output ends thereof extend out, the two first clamping blocks 58 move towards each other to clamp and hold the drill pipe 3, second hydraulic cylinders 57 are fixedly connected to both sides of the lower part of the main body 51 in mirror image with respect to the through hole, the output ends of the second hydraulic cylinders 57 are fixedly connected with second clamping blocks 59, and anti-skid strips 510 are arranged on the side walls of the second clamping blocks 59, and similarly, when the second hydraulic cylinders 57 work, the output ends thereof extend out, the two second clamping blocks 59 move towards each other to clamp the pipe body 23, and the anti-skid strips 510 cooperate with the grooves 22, that is, the arrangement of the grooves 22 on the water-proof casing 23 is also beneficial to the clamping of the clamping mechanism 5 to take the pipe body 23.

[0023] A cover plate 52 is fixedly connected to the upper end of the main body 51, and the cover plate 52 is fixed on the main body 51 by bolts to block the upper end of the main body 51 and improve the appearance of the clamping mechanism 5, and hydraulic impact hammers 53 are fixedly connected to both sides of the upper end of the cover plate 52, and the arrangement of the hydraulic impact hammers 53 is to generate downward impact force to facilitate the lowering of the water-proof casing 2.

[0024] The hydraulic impact hammer 53 comprises a cylindrical shell 532, an end plate 531 is fixedly connected to the lower end of the shell 532, the end plate 531 is fixedly connected to the shell 532 by bolts, and a seal is arranged therebetween, a cavity is arranged in the shell 532, and a piston 533 is slidably arranged in the cavity, the piston 533 is in the shape of a cylinder, and a seal is arranged on the side wall thereof, a spring 534 is arranged at the lower end of the piston 533, the lower end of the spring 534 abuts against the end plate 531, an oil channel 535 is arranged in the shell 532 to communicate with the cavity, that is, hydraulic oil is injected into the cavity through the oil channel 535, and then the water hammer effect is utilized to realize the downward movement of the piston 533, and after the piston 533 impacts the end plate 531, downward impact force is generated.

[0025] The lower device further comprises a hydraulic supply device, the input end of a hydraulic pump in the hydraulic supply device extracts hydraulic oil from an oil tank, a pipeline is arranged between the output end of the hydraulic pump and the oil tank, an overflow valve and a stop valve are sequentially arranged on the pipeline, the overflow valve provides a protection function, and when the hydraulic pressure in the pipeline is too high, the overflow valve functions as a pressure relief device, a branch is arranged on the pipeline to communicate with the oil channel 535, and the branch is located between the overflow valve and the stop valve.

[0026] When the hydraulic impact hammer 53 is working, the hydraulic pump works, and then the hydraulic oil is returned to the oil tank after being pumped, and the sudden cut-off valve is cut off in the process, so that the hydraulic oil flows into the chamber, and the piston piece 533 is pushed down and impacts on the end plate 531 by using the water hammer effect, and then the cut-off valve is opened, and the piston piece 533 is reset under the action of the spring 534, and the opening and closing frequency of the cut-off valve is controlled, so that the impact frequency of the hydraulic impact hammer 53 is realized.

[0027] Both ends of the main body 51 are fixedly connected with the connecting pieces 55, the connecting pieces 55 are fixed on the main body 51 in a welding manner, the connecting pieces 55 are fixedly connected with the lifting rings 54, and the cables of the winch mechanism 7 are fixedly connected on the lifting rings 54.

[0028] The connecting pieces 55 are provided with guide holes, the guide rods 4 are fixedly connected in the iron stand 1, and the guide rods 4 are slidingly matched in the guide holes. The guide rods 4 ensure that the clamping mechanism 5 keeps vertical during lifting.

[0029] Working principle: when the lower water isolation sleeve 2, the second clamping block 59 at the lower end of the clamping mechanism 5 clamps the pipe body 23, and as the drilling proceeds, the pipe body 23 is lowered, when the pipe body 23 is difficult to lower, the hydraulic impact hammer 53 works at this time, and the impact force generated realizes the lowering of the pipe body 23; When it is necessary to connect the drill rod 3 and the pipe body 23, the second hydraulic cylinder 57 works at this time, the second clamping block 59 loosens the clamping of the lowered pipe body 23, and the first hydraulic cylinder 56 works, the first clamping block 58 approaches each other and clamps and holds the upper part of the drill rod 3, at this time, the top driving drilling device 6 loosens the drill rod 3, the new drill rod 3 is sleeved in the inside of the new pipe body 23, and the drill rod 3 is vertically lifted and controlled independently above the drilling, first, the new drill rod 3 and the lowered drill rod 3 are connected through a pipe screwing machine or a threaded connection device, the new drill rod 3 is driven to rotate, so that the two drill rods 3 are threadedly connected, after the connection of the drill rod 3 is completed, the top driving drilling device 6 is connected with the upper end of the new drill rod 3, then the first hydraulic cylinder 56 works, the first clamping block 58 moves away from each other, and the drill rod 3 is loosened, at this time, the clamping mechanism 5 is lifted by the winch mechanism 7, finally, after the welding and the clamping tile 21 fixing of the new pipe body 23 and the lowered pipe body 23 are completed, the clamping mechanism 5 is lifted to the upper part of the pipe body 23 by the winch mechanism 7, at this time, the second hydraulic cylinder 57 works, the second clamping block 59 approaches each other, and then clamps and fixes the pipe body 23 in the recess 22 at the end, at this time, as the drill rod 3 rotates and drills, the pipe body 23 is lowered.

[0030] The technical means disclosed in the scheme of the present application is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features.

Claims

1. A conductor pipe (2) for oil drilling, characterized in that The utility model relates to a pipe body (23) and embrace tile (21), the end of pipe body (23) is the stepped structure, and is provided with several grooves (22) on the sidewall of smaller diameter, the inner wall of embrace tile (21) is provided with several convex strips, and the convex strip and groove (22) cooperate, the curvature of embrace tile (21) and the curvature of the maximum diameter section of pipe body (23) are equal.

2. A running device of a water isolation casing (2) for oil drilling, the water isolation casing (2) according to claim 1 is installed in the inside of a stand (1), characterized in that, The utility model relates to a clamping mechanism (5) and winch mechanism (7), winch mechanism (7) is fixed in the upper portion of iron stand (1), and the extended cable and clamping mechanism (5) fixed connection are connected; The clamping mechanism (5) includes a main body (51), the middle part of the main body (51) is provided with a through hole, the upper part of the main body (51) is fixedly connected with a first hydraulic cylinder (56) on both sides about the through hole, the output end of the first hydraulic cylinder (56) is fixedly connected with a first clamping block (58), the lower part of the main body (51) is fixedly connected with a second hydraulic cylinder (57) on both sides about the through hole, the output end of the second hydraulic cylinder (57) is fixedly connected with a second clamping block (59), the side wall of the second clamping block (59) is provided with an anti-skid strip (510), and the anti-skid strip (510) and the groove (22) cooperate.

3. A device for running a conductor pipe (2) for oil drilling into a well, according to claim 2, characterised in that: The upper end of the main body (51) is fixedly connected with a cover plate (52), and the upper end of the cover plate (52) is fixedly connected with a hydraulic impact hammer (53) on both sides.

4. A device for running a conductor pipe (2) for oil drilling into a well according to claim 3, characterized in that: The hydraulic impact hammer (53) includes a cylindrical shell (532), the lower end of the shell (532) is fixedly connected with an end plate (531), the inside of the shell (532) is provided with a chamber, and a piston (533) is slidably arranged in the chamber, the lower end of the piston (533) is provided with a spring (534), the lower end of the spring (534) abuts against the end plate (531), and the inside of the shell (532) is provided with an oil channel (535) in communication with the chamber.

5. A device for running a conductor pipe (2) for oil drilling into a well according to claim 4, characterized in that: The lower device further includes a hydraulic supply device, the input end of a hydraulic pump in the hydraulic supply device draws hydraulic oil from an oil tank, an output end and the oil tank are provided with a pipeline therebetween, an overflow valve and a stop valve are sequentially arranged on the pipeline, a branch is arranged on the pipeline and communicates with the oil channel (535), and the branch is located between the overflow valve and the stop valve.

6. A method of lowering a conductor pipe (2) for oil drilling into a well according to claim 2, characterized in that: Both ends of the main body (51) are fixedly connected with a connecting piece (55), a lifting eye (54) is fixedly connected on the connecting piece (55), and the extended cable of the winch mechanism (7) is fixedly connected on the lifting eye (54).

7. A device for running a conductor pipe (2) for oil drilling into a well according to claim 6, characterized in that: A guide hole is arranged on the connecting piece (55), and a guide rod (4) is fixedly connected in the inside of the iron stand (1) and slidably fits in the guide hole.

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