Deformed shaft drift diameter finder

Abstract

The utility model relates to the technical field of shaft repair, in particular to a deformed shaft drift diameter finder. Comprising an upper connector, the lower end of the upper connector is fixedly and hermetically connected with a guide pipe, the lower end face of the guide pipe is an inclined face, and a piston rod is slidably and hermetically connected into the guide pipe. When the finder is used for repairing the hole shrinkage position of the shaft, the finder is rotated, the maximum descending depth of the finder is found, after the finder is located at the maximum descending depth, the slope is opposite to the hole shrinkage position of the shaft, then the pressure in the upper connector is increased, the piston rod descends, and the hole shrinkage position of the shaft is repaired. In the descending process of the piston rod, the hole shrinkage position of the shaft can be repaired in advance, in the descending process of the piston rod, the guide pipe part opposite to the hole shrinkage position of the shaft can effectively centralize and stabilize the piston rod, and the piston rod can be prevented from inclining.

Description

Technical Field

[0001] The utility model relates to the technical field of wellbore repair, in particular to a deformed wellbore diameter finder. Background Art

[0002] Due to the poor quality of the local part of the wellbore, insufficient strength, poor cementing quality and the long-term injection-production pressure difference, the wellbore has a local diameter reduction, making the wellbore appear as an inward-concave ellipse in cross section. Figure 1 The AA section is no longer a basic circle, the major axis D is larger than the minor axis d, and generally when the difference between the major axis and the minor axis is greater than 20 mm, the wellbore may rupture. This radial concave wellbore deformation is the basic deformation form in casing damaged wells.

[0003] Long-term water immersion and expansion of mud and shale will cause rock slip. When the slip rate exceeds 30mm / year, the wellbore will be sheared, and the upper and lower parts will have lateral relative displacement after shearing. And due to the tensile load on the wellbore during cementing and the shrinkage force of the steel itself, after the wellbore is transversely dislocated, the upper and lower parts will shrink along their respective axes, and produce longitudinal relative displacement near the breakpoint. Figure 2 shown.

[0004] When the above two situations occur in the wellbore, the wellbore needs to be repaired.

[0005] The patent document with application number CN202110663501.8 discloses a fracture repair tool for an active faulted well. When working, the upper joint is connected to the drill bit, and then lowered into the active faulted well together with the drill bit. When it reaches the fracture, hydraulic pressure is applied to the cylinder body through the hydraulic group on the upper part of the active faulted well. The hydraulic pressure forms a circulation channel through the central hole of the guide pen tip to generate a pressure difference. Under the action of the pressure difference, the guide pen tip is pushed downward until it is inserted into the inner cavity of the lower casing of the fracture to find the channel; thereafter, the drill bit is driven to rotate by the ground turntable to generate a rotational torque, and the rotational torque drives the milling head to rotate. Under the guidance of the guide pen tip, the milling head drills and grinds the debris in the faulty space of the casing and repairs the fish top of the lower casing, opening a channel that can ensure the passage of tools of a certain diameter, thereby completing the purpose of finding and drilling a channel in the faulted well. However, when the guide pen tip moves downward to straighten the sleeve at the bottom of the fracture, since the diameter of the guide pen tip is smaller than the inner diameter of the sleeve, the sleeve at the bottom of the fracture cannot be concentric with the sleeve at the bottom of the fracture after the guide pen tip enters the sleeve at the bottom of the fracture. The sleeve part below the fracture will be milled during the rotation of the sleeve milling head, which will increase the length of the fracture and is not conducive to the repair of the fracture later. In the process of finding the path, when the sleeve part below the fracture is subject to greater resistance, the guide pen tip lacks effective straightening and is prone to bending and deformation. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a deformable wellbore diameter finder that can pre-repair the reduced diameter and misaligned part of the wellbore, and can effectively straighten and stabilize the piston rod during the straightening of the wellbore below the fracture, thereby preventing the piston rod from deforming. The deformable wellbore diameter finder can effectively straighten and stabilize the piston rod when repairing the reduced diameter part of the wellbore, thereby preventing the piston rod from bending and deforming.

[0007] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0008] The deformable wellbore diameter finder comprises an upper joint, the lower end of which is fixedly and sealedly connected with a guide tube, the lower end surface of the guide tube is an inclined surface, a piston rod is slidingly and sealedly connected inside the guide tube, the upper part of the piston rod is slidingly and sealedly connected with the guide tube, the upper part of the piston rod is elastically connected with the guide tube, and the lower end of the piston rod is a pointed end.

[0009] Specifically, the outer diameters of the upper joint and the guide tube are equal. After the upper joint and the guide tube are lowered into the wellbore, the inner wall of the wellbore is in sliding contact with the outer wall of the upper joint and the outer wall of the guide tube.

[0010] Specifically, a flange is provided on the upper part of the piston rod, an annular groove is provided on the inner wall of the guide tube, and the flange is slidably and sealingly connected in the annular groove.

[0011] Specifically, a spring is arranged in the annular groove, the upper end of the spring is fixedly connected to the flange, and the lower end of the spring is fixedly connected to the bottom of the annular groove.

[0012] Specifically, the piston rod portion below the annular groove is connected to the inner wall of the guide tube in a sliding and sealing manner. Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. When the finder is repairing the reduced diameter of the wellbore, the finder is intermittently rotated and then moved downward to find the maximum downward depth of the finder. After the finder is at the maximum downward depth, the inclined surface is opposite to the reduced diameter of the wellbore, and then the pressure in the upper joint is increased to make the piston rod move downward. During the downward movement of the piston rod, the reduced diameter of the wellbore can be repaired in advance. During the downward movement of the piston rod, the guide tube part opposite to the reduced diameter of the wellbore can effectively straighten and stabilize the piston rod, and prevent the piston rod from tilting.

[0014] 2. When the finder is repairing a faulted wellbore, the finder is rotated intermittently and then moved downward to find the maximum downward depth of the finder. After the finder is at the maximum downward depth, the lower end of the guide tube is inserted into the wellbore below the fracture. When the piston rod moves downward to pre-correct the wellbore below the fracture, the guide tube portion relative to the contact position between the piston rod and the wellbore below the fracture can effectively correct and stabilize the piston rod. By setting the inclined surface, it is convenient for the guide tube to move downward and be inserted into the wellbore below the fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the local shrinkage of the wellbore.

[0016] Figure 2 This is a schematic diagram of the wellbore after fault occurs.

[0017] Figure 3 It is a schematic diagram of the utility model.

[0018] Figure 4 It is a schematic diagram of the utility model for repairing the reduced diameter of a wellbore.

[0019] Figure 5 It is a schematic diagram of the utility model when repairing a shaft fault.

[0020] The names of the parts in the attached drawings are:

[0021] 1 Upper connector

[0022] 2 Spring

[0023] 3 Piston rod

[0024] 4 Guide tube

[0025] 5 bevel. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Example 1: Reference Figure 1 , Figure 3 and Figure 4 As shown, the deformable wellbore diameter finder includes an upper joint 1, the lower end of which is fixedly and sealedly connected to a guide tube 4, the outer diameters of the upper joint 1 and the guide tube 4 are equal, and after the upper joint 1 and the guide tube 4 are lowered into the wellbore, the inner wall of the wellbore is in sliding contact with the outer wall of the upper joint 1 and the outer wall of the guide tube 4.

[0028] The lower end surface of the guide tube 4 is an inclined surface 5 .

[0029] The piston rod 3 is connected in a sliding and sealing manner in the guide tube 4. The upper part of the piston rod 3 is connected in a sliding and sealing manner to the guide tube 4. The upper part of the piston rod 3 is elastically connected to the guide tube 4. The lower end of the piston rod 3 is a tip. Specifically, a flange is provided on the upper part of the piston rod 3, and an annular groove is provided on the inner wall of the guide tube 4. The flange is connected in a sliding and sealing manner in the annular groove. A spring 2 is provided in the annular groove. The upper end of the spring 2 is fixedly connected to the flange, and the lower end of the spring 2 is fixedly connected to the bottom of the annular groove. The piston rod 3 part below the annular groove is connected in a sliding and sealing manner to the inner wall of the guide tube 4.

[0030] The upper connector 1 of the finder is connected to the drilling tool and lowered into the wellbore with the drilling tool. When the guide tube 4 enters the reduced diameter section of the wellbore, the point finding operation is performed. The steps of the point finding operation are: 1. Make the drilling tool drive the finder to rotate a certain angle; 2. Make the drilling tool drive the finder downward. The maximum downward depth of the finder is found through the point finding operation. When the finder reaches the maximum downward depth, Figure 3 At this time, the inclined surface 5 of the guide tube 4 corresponds to the reduced diameter of the wellbore.

[0031] Then, the pressure in the upper joint 1 is increased to make the piston rod 3 move downward. During the downward movement of the piston rod 3, the reduced diameter of the wellbore can be repaired in advance. During the downward movement of the piston rod 3, the portion of the guide tube 4 opposite to the reduced diameter of the wellbore can effectively straighten and stabilize the piston rod 3, and can prevent the piston rod 3 from tilting. After the piston rod 3 repairs the reduced diameter of the wellbore, the drilling tool drives the finder downward. After the finder moves downward, the guide tube 4 can thoroughly repair the reduced diameter of the wellbore.

[0032] Embodiment 2: Based on Embodiment 1, refer to Figure 2 , Figure 3 and Figure 5 As shown, when the finder repairs a faulted wellbore, the guide tube 4 enters the faulted part of the wellbore to perform a point-finding operation and find the maximum descending depth of the finder. Figure 5 As shown. The lower end of the guide tube 4 is inserted into the wellbore below the fracture. When the piston rod 3 moves downward to pre-align the wellbore below the fracture, the guide tube 4 portion relative to the contact position between the piston rod 3 and the wellbore below the fracture can effectively straighten and stabilize the piston rod 3. After the piston rod 3 pre-aligns the wellbore below the fracture, the drill tool drives the finder downward. When the guide tube 4 enters the wellbore below the fracture, the repair of the faulted wellbore is completed. At the same time, by setting the inclined surface 5, it is convenient for the guide tube 4 to move downward into the wellbore below the fracture.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A deformable wellbore diameter finder, comprising an upper joint (1), characterized in that: The lower end of the upper joint (1) is fixedly sealedly connected to a guide tube (4), the lower end surface of the guide tube (4) is an inclined surface (5), the inside of the guide tube (4) is slidably sealedly connected to a piston rod (3), the upper part of the piston rod (3) is slidably sealedly connected to the guide tube (4), the upper part of the piston rod (3) is elastically connected to the guide tube (4), and the lower end of the piston rod (3) is a pointed end.

2. The deformable wellbore diameter finder according to claim 1, characterized in that: The outer diameters of the upper joint (1) and the guide tube (4) are equal. After the upper joint (1) and the guide tube (4) are lowered into the wellbore, the inner wall of the wellbore is in sliding contact with the outer wall of the upper joint (1) and the outer wall of the guide tube (4).

3. The deformable wellbore diameter finder according to claim 1, characterized in that: The upper part of the piston rod (3) is provided with a flange, the inner wall of the guide tube (4) is provided with an annular groove, and the flange is slidably and sealingly connected in the annular groove.

4. The deformable wellbore diameter finder according to claim 3, characterized in that: A spring (2) is arranged in the annular groove, the upper end of the spring (2) is fixedly connected to the flange, and the lower end of the spring (2) is fixedly connected to the bottom of the annular groove.

5. The deformable wellbore diameter finder according to claim 4, characterized in that: The piston rod (3) portion below the annular groove is connected to the inner wall of the guide tube (4) in a sliding and sealing manner.

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