Built-in hydraulic centralizer convenient to adjust

Abstract

The utility model discloses a built-in hydraulic centralizer convenient to adjust, and belongs to the field of centralizers, the built-in hydraulic centralizer convenient to adjust comprises an oil pipe and three centralizing mechanisms, the inner wall of the oil pipe is provided with three pressurizing holes, the number of the centralizing mechanisms is three, and the centralizing mechanisms are arranged on the oil pipe and used for centering and centralizing the oil pipe after the oil pipe is placed in a well; wherein the righting mechanism comprises a movable guide plate and two abutting plates embedded to the outer side of the guide plate, the guide plate is arranged in the oil pipe, a set of steel balls are embedded in the top of the guide plate, and a set of springs are installed at the bottom of the guide plate; the guide plate capable of conducting self-adaptive adjustment according to the well wall condition is matched with the steel balls, making contact with the well wall, on the outer side of the guide plate for guiding well descending, the pipe clamping phenomenon is reduced, meanwhile, after pipe descending is in place, the abutting plate can be driven to abut against the well wall in an attached mode through hydraulic pressurization, the adjusting precision is better, and the attached abutting effect between the abutting plate and the well wall is guaranteed; and righting treatment of the oil pipe is completed.

Description

Technical Field

[0001] The utility model relates to the field of centralizers, in particular to a built-in hydraulic centralizer which is easy to adjust. Background Art

[0002] In all current cementing operations of inclined or horizontal wells, the casing is close to the low side due to the effect of gravity, and even the casing is attached to the well wall below. This results in no cement seal between the well wall and the casing at the low side, poor cementing quality, and even gaps between the upper and lower oil layers along the casing, causing layer cross-linking, which brings great trouble to oil and gas production management. Therefore, in order to ensure the quality of cementing, a centralizer is generally added to the casing.

[0003] After searching, the authorization announcement number of China Standing "A Hydraulic Straightener" is "CN212927746U", which includes a tubular main body with a plurality of radial holes on the wall; a plurality of T-shaped support arms, each of which is slidably connected in the radial hole; the cross arm of each T-shaped support arm is arranged at the outer end of the T-shaped support arm, so as to extend out of the radial hole when straightening; it adopts a T-shaped support arm, and when straightening, the cross arm of the T-shaped support arm is against the well wall, and there is no problem of inserting into the well wall; and the cross arm has a large force-bearing area, will not be fixed in one place, and will not be broken when the casing is extended or retracted, thereby avoiding the problem of straightening failure.

[0004] However, the above method has the following defects in actual use: during the process of lowering the oil pipe into the well, although the T-shaped support arm is in a hidden state, which is convenient for lowering the oil pipe into the well, if the oil pipe is stuck with the well wall during the process, the T-shaped support arm is not easy to release the jam, which increases the difficulty of lowering the oil pipe. In addition, the outward expansion adjustment of the T-shaped support arm adopts barbs, which has poor adjustment accuracy and is easy to affect the interference effect between the T-shaped support arm and the well wall.

[0005] Based on this, the utility model designs a built-in hydraulic centralizer which is easy to adjust to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a built-in hydraulic centralizer which is easy to adjust.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A conveniently adjustable built-in hydraulic centralizer comprises an oil pipe and a centralizing mechanism. The inner wall of the oil pipe is provided with three pressure holes. The centralizing mechanisms are provided on the oil pipe and are used to centrally centralize the oil pipe after it is placed in the well. The centralizing mechanisms comprise a movable guide plate and two contact plates embedded on the outside of the guide plate. The guide plate is disposed inside the oil pipe, a group of steel balls are embedded on the top of the guide plate, and a group of springs are installed on the bottom of the guide plate.

[0009] Furthermore, the straightening mechanism further comprises a mounting tube connected to the pressurized hole, an adjusting tube being slidably connected to the mounting tube, a hinge ball being embedded in the top of the adjusting tube, the adjusting tube being connected to the guide plate via the hinge ball, and a group of the springs being evenly distributed between the guide plate and the adjusting tube along the axis of the adjusting tube;

[0010] Furthermore, the outer fixed sleeve of the regulating tube is provided with a piston ring slidably connected to the inner portion of the mounting tube, an N-shaped tube is mounted on the mounting tube, both ends of the N-shaped tube extend into the interior of the mounting tube and are respectively located on both sides of the piston ring, and a first one-way valve is mounted on the outer side of the N-shaped tube;

[0011] Furthermore, a driving rod extending to the outside of the guide plate is hingedly connected to one side of the contact plate;

[0012] Furthermore, a conduit extending to the outside of the regulating tube is installed inside the regulating tube, a piston plate is slidably connected to the inside of the conduit, a T-shaped rod is slidably connected to the conduit, an end of the T-shaped rod away from the conduit passes through and extends to the outside of the driving rod, and a second one-way valve is installed on the outside of the conduit;

[0013] Furthermore, three inner grooves are opened on the outer side of the oil pipe, the mounting pipe is fixedly mounted inside the inner grooves, and the guide plate is located inside the inner grooves;

[0014] Furthermore, the pressure-opening strength of the valve core inside the first one-way valve is lower than the pressure-opening strength of the valve core inside the second one-way valve;

[0015] Furthermore, two through slots are provided inside the regulating tube and are slidably connected to the T-shaped rod. Beneficial effects

[0016] During the tubing lowering process, steel balls on the guide plate are placed on the outside of the tubing, with a gap between them and the wellbore wall. When the steel balls in the corresponding area come into contact with the wellbore wall due to the weight of the tubing during lowering, they can be rolled and guided to reduce the risk of tubing getting stuck. If the tubing gets stuck when passing through curved passages in the well or if there are debris on the wellbore wall, the tubing lowering operation can be continued. In combination with the spring setting, the guide plate adaptively adjusts its angle during pressure to ensure the contact point of the steel balls, assisting the tubing in normal movement, thereby unblocking the tubing, reducing the difficulty of lowering the tubing and facilitating smoother lowering.

[0017] The movement amplitude of the guide plate and the resistance plate are adjusted respectively by the first one-way valve and the second one-way valve. The adjustment amplitude is related to the user's pressurization time, which is more convenient to control and effectively reduces the reset phenomenon, making the adjustment accuracy better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0019] Figure 1 This is a three-dimensional diagram of the main structure of an easily adjustable built-in hydraulic centralizer of the utility model;

[0020] Figure 2 This is a three-dimensional cross-sectional view of an oil pipe in a built-in hydraulic centralizer that is easy to adjust according to the utility model;

[0021] Figure 3 for Figure 2 A magnified view of middle A;

[0022] Figure 4 This is a three-dimensional cross-sectional view of the installation pipe and the guide tube in a built-in hydraulic centralizer that is easy to adjust according to the utility model;

[0023] Figure 5 The utility model is a three-dimensional cross-sectional view of the installation pipe and the adjustment pipe of the built-in hydraulic centralizer which is easy to adjust.

[0024] The numbers in the figure represent:

[0025] 100. Oil pipe; 110. Internal groove; 200. Righting mechanism; 210. Guide plate; 211. Steel ball; 212. Spring; 220. Contact plate; 221. Drive rod; 230. Mounting tube; 231. N-shaped tube; 232. First one-way valve; 240. Adjusting tube; 241. Articulated ball; 242. Piston ring; 243. Conduit; 244. Piston plate; 245. T-shaped rod; 246. Second one-way valve; 300. Pressurized hole. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] The present invention will be further described below with reference to the embodiments.

[0028] In some embodiments, please refer to the appendix of the specification. Figure 1-5 A conveniently adjustable built-in hydraulic centralizer includes an oil pipe 100 and a centralizing mechanism 200. The inner wall of the oil pipe 100 is provided with three pressurized holes 300. The centralizing mechanisms 200 are arranged on the oil pipe 100 and are used to centrally centralize the oil pipe 100 after it is placed in the well. The centralizing mechanism 200 includes a movable guide plate 210 and two contact plates 220 embedded in the outer side of the guide plate 210. The guide plate 210 is disposed inside the oil pipe 100. A group of steel balls 211 are embedded in the top of the guide plate 210, and a group of springs 212 are installed at the bottom of the guide plate 210.

[0029] The straightening mechanism 200 on the oil pipe 100 is used to assist it in being lowered into the well smoothly, and the straightening operation is performed after it is lowered into the well and in place.

[0030] In the embodiment of the present invention, when the oil pipe 100 is lowered, the pressure hole 300 is used to apply hydraulic pressure to the straightening mechanism 200, so that the guide plate 210 and the steel ball 211 are expanded and moved outward until the steel ball 211 is outside the oil pipe 100 and there is a gap between the steel ball 211 and the well wall. During the lowering process, if the well wall contacts the steel ball 211, the steel ball 211 can be used for auxiliary guidance. If the pipe is stuck when passing through the curved channel in the well or there are debris in the well wall, the lowering operation can be continued. With the setting of the spring 212, the guide plate 210 will adaptively adjust the angle during the pressure process to ensure the contact point of the steel ball 211, assisting the normal movement of the oil pipe 100, thereby completing the unblocking phenomenon and facilitating smooth lowering of the pipe. After the pipe is in place, the contact plate 220 is fitted and abutted against the well wall to complete the straightening process of the oil pipe 100.

[0031] In some embodiments, as Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, as a preferred embodiment of the present invention, the righting mechanism 200 further includes a mounting tube 230 connected to the pressurized hole 300, an adjusting tube 240 is slidably connected to the mounting tube 230, a hinge ball 241 is embedded in the top of the adjusting tube 240, the adjusting tube 240 is connected to the guide plate 210 through the hinge ball 241, and a group of springs 212 are evenly distributed between the guide plate 210 and the adjusting tube 240 along the axis of the adjusting tube 240; a fixed sleeve on the outside of the adjusting tube 240 is provided with a piston ring 242 slidably connected to the inside of the mounting tube 230, an N-shaped tube 231 is installed on the mounting tube 230, both ends of the N-shaped tube 231 extend into the interior of the mounting tube 230 and are respectively located on both sides of the piston ring 242, and a first one-way valve 232 is installed on the outside of the N-shaped tube 231;

[0032] When hydraulic pressure is applied through the pressure hole 300, the piston ring 242 in the mounting tube 230 will be pressurized to drive the regulating tube 240 to move, causing the guide plate 210 and the steel ball 211 to move toward the outside of the oil pipe 100. At this time, the first one-way valve 232 on the N-shaped tube 231 is opened by pressure, and the piston ring 242 and the gas on the side away from the pressure hole 300 are discharged into the mounting tube 230 along the N-shaped tube 231 until the steel ball 211 is in the appropriate position. The pressure is then stopped, and the first one-way valve 232 is closed, thereby ensuring the stability of the regulating tube 240 and the guide plate 210. Then the tube lowering operation is carried out. During the tube lowering process, the guide plate 210 will change its angle along the hinge ball 241. In combination with the setting of the spring 212, it will perform adaptive adjustment according to the pressure conditions to reduce the occurrence of tube jamming.

[0033] In an embodiment of the present invention, a driving rod 221 extending to the outside of the guide plate 210 is hinged on one side of the contact plate 220. The hinged manner allows the contact plate 220 to remain unaffected when following the adjustment movement of the guide plate 210. After the lower pipe is in place, the driving rod 221 can drive the contact plate 220 to fit into the well wall, thereby completing the straightening of the oil pipe 100.

[0034] In the embodiment of the present utility model, a guide tube 243 extending to its outside is installed inside the regulating tube 240, and a piston plate 244 is slidably connected to the inside of the guide tube 243. A T-shaped rod 245 is slidably connected to the guide tube 243. The end of the T-shaped rod 245 away from the guide tube 243 passes through and extends to the outside of the driving rod 221. A second one-way valve 246 is installed on the outside of the guide tube 243. After the tube is lowered into place, hydraulic pressure is applied again to make the guide plate 210 and the steel ball 211 continue to expand outward until they fit into the well wall, completing the pre-fixing process. Then, when the piston ring 242 cannot move, the internal pressure of the installation tube 230 continues to increase. At this time, the second one-way valve 246 is opened under pressure, and then the piston plate 244 will push the T-shaped rod 245 to move, so that the driving rod 221 drives the contact plate 220 to fit into and contact with the well wall, completing the straightening operation of the oil pipe 100.

[0035] In an embodiment of the present invention, three internal grooves 110 are opened on the outer side of the oil pipe 100, the mounting pipe 230 is fixedly installed inside the internal groove 110, and the guide plate 210 is inside the internal groove 110. The setting of the internal groove 110 can make the straightening mechanism 200 inside the oil pipe 100, which is convenient for pipe lowering operations and reduces the occurrence of pipe jamming.

[0036] In the embodiment of the present invention, the pressure-opening strength of the valve core inside the first one-way valve 232 is lower than the pressure-opening strength of the valve core inside the second one-way valve 246. Therefore, during the hydraulic pressurization process, the first one-way valve 232 can be pre-pressurized to open, driving the guide plate 210 and the steel ball 211 to pre-guide the lowering of the pipe. After the lowering of the pipe is in place, hydraulic pressurization is performed again. At this time, the second one-way valve 246 is pressurized to open again, completing the contact between the contact plate 220 and the well wall, thereby achieving the straightening treatment of the oil pipe 100.

[0037] During the pressurization process, the first one-way valve 232 and the second one-way valve 246 are used to limit the regulating tube 240 and the T-shaped rod 245 respectively, which is more convenient during movement adjustment and effectively reduces the reset phenomenon, thereby improving the adjustment accuracy.

[0038] In the embodiment of the present invention, two through grooves are provided inside the adjusting tube 240 and are slidably connected to the T-shaped rod 245. This enables the T-shaped rod 245 to slide along the grooves when pushing the driving rod 221 to move, and is less likely to get stuck.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A built-in hydraulic centralizer that is easy to adjust, comprising an oil pipe (100), wherein the inner wall of the oil pipe (100) is provided with three pressurizing holes (300), characterized in that: A straightening mechanism (200), wherein the number of the straightening mechanisms (200) is three, and the straightening mechanisms (200) are arranged on the oil pipe (100) and are used to center and straighten the oil pipe (100) after it is placed in the well; The straightening mechanism (200) includes a movable guide plate (210) and two contact plates (220) embedded in the outside of the guide plate (210). The guide plate (210) is arranged inside the oil pipe (100). A group of steel balls (211) are embedded in the top of the guide plate (210), and a group of springs (212) are installed at the bottom of the guide plate (210).

2. The easily adjustable built-in hydraulic centralizer according to claim 1, characterized in that: The straightening mechanism (200) further comprises a mounting tube (230) in communication with the pressurizing hole (300), an adjusting tube (240) being slidably connected to the mounting tube (230), a hinge ball (241) being embedded in the top of the adjusting tube (240), the adjusting tube (240) being connected to the guide plate (210) via the hinge ball (241), and a group of springs (212) being evenly distributed between the guide plate (210) and the adjusting tube (240) along the axis of the adjusting tube (240).

3. The easily adjustable built-in hydraulic centralizer according to claim 2, characterized in that: The outer fixed sleeve of the regulating tube (240) is provided with a piston ring (242) slidably connected to the inner portion of the mounting tube (230). An N-shaped tube (231) is mounted on the mounting tube (230). Both ends of the N-shaped tube (231) extend into the interior of the mounting tube (230) and are respectively located on both sides of the piston ring (242). A first one-way valve (232) is mounted on the outer side of the N-shaped tube (231).

4. The easily adjustable built-in hydraulic centralizer according to claim 3, characterized in that: A driving rod (221) extending to the outside of the guide plate (210) is hingedly connected to one side of the contact plate (220).

5. The easily adjustable built-in hydraulic centralizer according to claim 4, characterized in that: The regulating tube (240) is internally installed with a conduit (243) extending to the outside thereof, the conduit (243) is internally slidably connected to a piston plate (244), the conduit (243) is slidably connected to a T-shaped rod (245), the end of the T-shaped rod (245) away from the conduit (243) passes through and extends to the outside of the driving rod (221), and the outside of the conduit (243) is installed with a second one-way valve (246).

6. The easily adjustable built-in hydraulic centralizer according to claim 2, characterized in that: Three inner grooves (110) are provided on the outer side of the oil pipe (100), the mounting pipe (230) is fixedly mounted inside the inner grooves (110), and the guide plate (210) is located inside the inner grooves (110).

7. The easily adjustable built-in hydraulic centralizer according to claim 5, characterized in that: The pressure-opening strength of the valve core inside the first one-way valve (232) is lower than the pressure-opening strength of the valve core inside the second one-way valve (246).

8. The easily adjustable built-in hydraulic centralizer according to claim 5, characterized in that: The regulating tube (240) has two through slots formed therein for sliding connection with the T-shaped rod (245).

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