Built-in liner tube shifting tool

Abstract

The invention relates to the field of mechanical tools, in particular to a built-in liner tube shifting tool which comprises an inner barrel and a jar, the inner barrel comprises a conical section and a cylindrical section, one end of the conical section is fixedly connected with one end of the cylindrical section, the outer diameter of the conical section is gradually increased from one end to the other end, and the other end of the cylindrical section is fixedly connected with one end of the jar. The built-in liner tube shifting tool has the beneficial effects that the conical section of the built-in liner tube shifting tool is used for abutting against the conical surface of the inner hole of the liner tube, uniform tensile load can be applied to the conical surface when the cylindrical section is pulled, and meanwhile, the jar can apply axial vibration load to the liner tube, so that the inner hole of the liner tube is prevented from being damaged. The lining pipe in the round hole can be smoothly taken out due to corrosion, static friction and other factors of the lining pipe and the inner wall of the round hole of the workpiece, the lining pipe taking-out device has the advantages of being high in reliability and convenient to operate, the lining pipe can be effectively, conveniently and rapidly taken out, work efficiency is improved, and labor cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of mechanical tooling, and particularly to a tool for extracting an inner liner tube Background Art

[0002] Measurement-while-drilling instruments used in oil drilling, such as MWD, LWD, geosteering, rotary steering, near-bit, etc., often transmit drilling parameter information through electromagnetic signals. Therefore, these instruments need to be processed in a non-magnetic environment. The most common method is to place a non-magnetic inner liner tube (abbreviation: inner liner) made of a special material, such as a non-metallic ceramic inner liner, on the inner wall of the circular hole of the metal material pipe fitting of the logging instrument component, so that the local area of the interface between the components is in a non-magnetic environment. The non-magnetic inner liner and the circular hole part are in a small clearance fit during assembly. During use, due to the corrosion of the inner wall of the circular hole part or other impurities entering the annulus between the inner liner and the circular hole part, the inner liner often adheres tightly to the inner wall of the circular hole part. When extracting the inner liner, due to the smooth inner wall of the inner liner and no available gripper, it is very difficult to efficiently extract the inner liner, and even the method of chiseling the inner liner is used to extract it, which is inefficient, time-consuming and laborious. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to extract the inner liner.

[0004] The technical solution of the present invention to solve the above technical problem is as follows: A tool for extracting an inner liner tube includes an inner cylinder and a shock absorber. The inner cylinder includes a conical section and a cylindrical section. One end of the conical section is fixedly connected to one end of the cylindrical section. The outer diameter of the conical section gradually increases from one end to the other end. The other end of the cylindrical section is fixedly connected to one end of the shock absorber.

[0005] The beneficial effect of the present invention is that the conical section of the tool for extracting the inner liner tube is used to abut against the conical surface of the inner hole of the inner liner. When pulling the cylindrical section, a uniform tensile load can be applied to the conical surface. At the same time, the shock absorber can apply an axial shock load to the inner liner, so that the adhesion state of the inner liner caused by factors such as corrosion and static friction between the inner liner and the inner wall of the workpiece circular hole is loosened, so as to smoothly extract the inner liner in the circular hole. It has the characteristics of high reliability and convenient operation, can effectively realize the convenient and fast extraction of the inner liner, improve work efficiency and reduce labor costs.

[0006] On the basis of the above technical solution, the present invention can be further improved as follows.

[0007] Further, a plurality of wedge-shaped notches are circumferentially spaced apart on the outer wall of the conical section.

[0008] The beneficial effects of adopting the above further solution are as follows: By providing a wedge-shaped notch, the conical section has a certain amount of deformation, so that the conical section can contract and be inserted into the inner hole of the lining tube under the action of an external force. Due to the elastic recovery of the metal material, the conical section returns to its original size and can closely adhere to the conical surface of the lining tube.

[0009] Further, a central hole and a body inner hole that communicate with each other are provided inside the inner cylinder. The central hole is located at the other end of the conical section, and the inner diameter of the central hole is smaller than the inner diameter of the body inner hole.

[0010] Further, it further includes a support pin. The support pin includes a pin head and a pin shaft. The pin head and the pin shaft are fixedly connected. The diameter of the pin head is larger than the diameter of the pin shaft. The pin shaft is sleeved in the central hole, and the pin head is located in the body inner hole, and its end abuts against the end wall of the central hole.

[0011] The beneficial effects of adopting the above further solution are as follows: After the inner cylinder is inserted into the lining tube, the support pin is placed inside the inner cylinder. When the inner cylinder is pulled outwards, due to the filling effect of the support pin in the inner hole, the conical section cannot elastically retract, thus pulling out the lining tube.

[0012] Further, the diameter of the pin head is 0.2 - 0.4 mm smaller than the inner diameter of the body inner hole, and the diameter of the pin shaft is 0.2 - 0.4 mm smaller than the inner diameter of the central hole.

[0013] The beneficial effects of adopting the above further solution are as follows: The support pin has a clearance fit with the inner cylinder, which facilitates the insertion of the support pin into the inner cylinder. At the same time, the support pin can effectively prevent the conical section from retracting when being pulled out.

[0014] Further, the wall thickness of the cylindrical section is less than 2.5 mm, and the axial length of the central hole is 2 - 4 mm.

[0015] Further, the axial length of the wedge-shaped notch is greater than or equal to the axial length of the conical section.

[0016] Further, there are six wedge-shaped notches, and the six wedge-shaped notches are evenly distributed along the circumferential direction of the conical section.

[0017] Further, it further includes a traction shaft, and the other end of the shock absorber is fixedly connected to the traction shaft.

[0018] The beneficial effects of adopting the above further solution are as follows: By applying a pulling force to the traction shaft manually or mechanically, or the traction shaft itself can provide a pulling force, thereby pulling the shock absorber and the inner cylinder to pull out the lining tube.

[0019] Further, it further includes a fixing sleeve, and the fixing sleeve is fixedly arranged and used for fixedly connecting with the workpiece.

[0020] The beneficial effects of adopting the above further solution are as follows: The fixing sleeve is used to fix the workpiece to prevent the workpiece from moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the use of the built-in liner extraction tool of the present invention;

[0022] Figure 2 FIG. is a structural diagram of the inner cylinder of the present invention.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Inner cylinder; 1-1. Tapered section; 1-2. Cylindrical section; 1-3. External thread section; 1-4. Wedge-shaped notch; 1-5. Central hole; 1-6. Inner hole of the body; 1-7. Chamfer; 2. Support pin; 3. Shock absorber; 4. Traction shaft; 5. Fixing sleeve; 6. Inner liner; 7. Workpiece; 7-1. Round hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The principles and features of the present invention will be described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] As Figure 1 and Figure 2 shown, this embodiment provides a built-in liner extraction tool, including an inner cylinder 1 and a shock absorber 3. The inner cylinder 1 includes a tapered section 1-1 and a cylindrical section 1-2. One end of the tapered section 1-1 is fixedly connected to one end of the cylindrical section 1-2. The outer diameter of the tapered section 1-1 gradually increases from one end to the other end. The other end of the cylindrical section 1-2 is fixedly connected to one end of the shock absorber 3.

[0027] Specifically, the outer wall of the inner liner 6 is a smooth cylindrical surface, the inner wall is smooth and in an inner saddle shape. The inner holes at both ends are tapered holes (the side walls are called tapered surfaces). The diameter of the tapered hole at the end facing the end of the inner liner 6 is larger than the diameter of the end facing the middle of the inner liner 6. The middle of the inner hole of the inner liner 6 is an inner liner cylindrical section. The inner liner 6 is arranged in the round hole 7-1 of the workpiece 7. More specifically, the round hole 7-1 is a countersunk hole.

[0028] The tapered section 1-1 of the built-in liner extraction tool is used to abut against the tapered surface of the inner hole of the inner liner 6. When pulling the cylindrical section 1-2, a uniform tensile load can be applied to the tapered surface. At the same time, the shock absorber 3 can apply an axial vibration load to the inner liner, so that the adhesion state of the inner liner 6 caused by factors such as corrosion and static friction between the inner liner 6 and the inner wall of the round hole 7-1 of the workpiece 7 becomes loose, so as to smoothly remove the inner liner 6 in the round hole 7-1. It has the characteristics of high reliability and convenient operation, can effectively realize the convenient and fast removal of the inner liner 6, improve work efficiency and reduce labor costs.

[0029] Specifically, the outer contour dimensions of the conical section 1-1 are the same as the inner diameter dimensions of the conical surfaces at both ends of the inner liner tube 6.

[0030] Optionally, an external thread section 1-3 is provided on the outer wall at the other end of the cylindrical section 1-2, and the cylindrical section 1-2 is connected to the shock absorber 3 through the external thread section 1-3.

[0031] Specifically, the outer edge at the other end of the conical section 1-1 has an arc-shaped chamfer 1-7.

[0032] Specifically, the outer diameter of the cylindrical section 1-2 is slightly smaller than the inner diameter of the cylindrical section of the inner liner tube.

[0033] Preferably, the outer diameter of the cylindrical section 1-2 is 1-3 mm smaller than the inner diameter of the cylindrical section of the inner liner tube 6.

[0034] Specifically, the shock absorber 3 can be implemented by an existing shock absorber, which can generate axial vibration under a set tensile force.

[0035] Specifically, the starting axial tensile force of the shock absorber 3 is adjustable.

[0036] Based on the above technical solution, a plurality of wedge-shaped notches 1-4 are provided at intervals along the circumferential direction on the outer wall of the conical section 1-1.

[0037] The wedge-shaped notches 1-4 are provided so that the conical section 1-1 has a certain amount of deformation. Thus, the conical section 1-1 can contract and be inserted into the inner hole of the inner liner tube 6 under an external force, and the conical section 1-1 can return to its original size due to the elasticity of the metal material and be closely attached to the conical surface of the inner liner tube 6.

[0038] Specifically, the wedge-shaped notches 1-4 are notches opened along the radial direction of the conical section 1-1 and are formed by cutting the conical section 1-1 with two planes with an acute angle between them.

[0039] Based on the above technical solution, a central hole 1-5 and a body inner hole 1-6 that communicate with each other are provided in the inner cylinder 1. The central hole 1-5 is located inside the other end of the conical section 1-1, and the inner diameter of the central hole 1-5 is smaller than the inner diameter of the body inner hole 1-6.

[0040] Specifically, the difference between the inner diameter of the central hole 1-5 and the inner diameter of the body inner hole 1-6 is not less than 2 mm.

[0041] Preferably, the difference between the inner diameter of the central hole 1-5 and the inner diameter of the body inner hole 1-6 is 2.5 mm.

[0042] On the basis of the above technical solution, it further includes a support pin 2. The support pin 2 includes a pin head and a pin shaft. The pin head and the pin shaft are fixedly connected. The diameter of the pin head is larger than that of the pin shaft. The pin shaft is sleeved in the central hole 1-5, and the pin head is located in the inner hole 1-6 of the body, and its end abuts against the end wall of the central hole 1-5.

[0043] After the inner cylinder 1 is loaded with the lining tube 6, the support pin 2 is placed into the inner cylinder 1. When the inner cylinder 1 is pulled outwards, due to the filling effect of the support pin 2 in the inner hole, the conical section 1-1 cannot elastically retract, thereby pulling out the lining tube.

[0044] On the basis of the above technical solution, the diameter of the pin head is 0.2-0.4 mm smaller than the inner diameter of the inner hole 1-6 of the body, and the diameter of the pin shaft is 0.2-0.4 mm smaller than the inner diameter of the central hole 1-5.

[0045] The support pin 2 is in clearance fit with the inner cylinder 1, which is convenient for the support pin 2 to be inserted into the inner cylinder 1. At the same time, the support pin 2 can effectively prevent the conical section 1-1 from retracting when being pulled out.

[0046] On the basis of the above technical solution, the wall thickness of the cylindrical section 1-2 is less than 2.5 mm, and the axial length of the central hole 1-5 is 2-4 mm.

[0047] Preferably, the wall thickness of the cylindrical section 1-2 is 3 mm, and the axial length of the central hole 1-5 is 3 mm.

[0048] On the basis of the above technical solution, the axial length of the wedge-shaped notch 1-4 is greater than or equal to the axial length of the conical section 1-1.

[0049] Preferably, the axial length of the wedge-shaped notch 1-4 is 3-5 mm longer than the axial length of the conical section 1-1.

[0050] On the basis of the above technical solution, there are six wedge-shaped notches 1-4, and the six wedge-shaped notches 1-4 are evenly distributed along the circumferential direction of the conical section 1-1.

[0051] Specifically, the bottom length of the wedge-shaped notch 1-4 is 1 / 12 of the outer wall circumference of the other end of the conical section 1-1.

[0052] On the basis of the above technical solution, it further includes a traction shaft 4, and the other end of the shock absorber 3 is fixedly connected to the traction shaft 4.

[0053] By applying a pulling force to the traction shaft 4 manually or mechanically, or the traction shaft itself can provide a pulling force, thereby pulling the shock absorber 3 and the inner cylinder 1 to pull out the lining tube 6.

[0054] Specifically, the maximum pulling force provided by the traction shaft 4 is greater than the starting axial pulling force of the shock absorber 3.

[0055] On the basis of the above technical solution, it further includes a fixing sleeve 5, and the fixing sleeve 5 is fixedly arranged and used for fixedly connecting with the workpiece 7.

[0056] The fixing sleeve 5 is used to fix the workpiece 7 to prevent the workpiece 7 from moving.

[0057] Optionally, the fixing sleeve 5 is a fixedly arranged fixture, plate or block structure.

[0058] In this embodiment, the using process of the built-in liner extracting tool is as follows:

[0059] 1. After the tapered section 1-1 of the inner cylinder 1 is squeezed and contracted, it passes through the liner cylinder section of the inner liner 6, and then elastically rebounds and clings to the surface of the tapered surface of the inner liner 6.

[0060] 2. Place the support pin 2 into the central hole 1-5 at the bottom of the inner cylinder 1.

[0061] 3. Fix the workpiece 7 by using the fixing sleeve 5.

[0062] 4. Connect the cylindrical section 1-2 of the inner cylinder 1 and the shock absorber 3.

[0063] 4. Connect the shock absorber 3 and the traction shaft 4.

[0064] 5. Start the traction shaft 4 to drive the inner cylinder 1 to move axially outward until the inner liner 6 is pulled out. Specifically, when the tensile force reaches the starting shock tensile force of the shock absorber 3, the shock absorber 3 will generate an axial shock force, and the shock force is transmitted to the inner liner 6 through the inner cylinder 1, thereby vibrating the inner liner 6 and pulling out the inner saddle-shaped inner liner 6.

[0065] The built-in liner extracting tool not only applies a uniform tensile load to the inner saddle-shaped inner liner through the inner cylinder, but also can apply a vibration load to the inner liner, so as to smoothly take out the inner liner in the counterbore, and has the characteristics of high reliability and convenient operation.

[0066] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and 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 should not be construed as a limitation to the present invention.

[0067] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0069] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two components. 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 circumstances.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An internal liner extraction tool, characterized in that, It includes an inner cylinder (1) and a shock absorber (3). The inner cylinder (1) includes a conical section (1-1) and a cylindrical section (1-2). One end of the conical section (1-1) is fixedly connected to one end of the cylindrical section (1-2). The outer diameter of the conical section (1-1) gradually increases from one end to the other end. The other end of the cylindrical section (1-2) is fixedly connected to one end of the shock absorber (3).

2. The built-in liner extraction tool according to claim 1, wherein A plurality of wedge-shaped notches (1-4) are circumferentially spaced apart on the outer wall of the conical section (1-1).

3. The built-in liner extraction tool according to claim 2, wherein, A central hole (1-5) and a body inner hole (1-6) that communicate with each other are provided in the inner cylinder (1). The central hole (1-5) is located in the other end of the conical section (1-1), and the inner diameter of the central hole (1-5) is smaller than the inner diameter of the body inner hole (1-6).

4. The built-in liner extraction tool according to claim 3, characterized in that, It further includes a support pin (2). The support pin (2) includes a pin head and a pin shaft. The pin head and the pin shaft are fixedly connected. The diameter of the pin head is larger than the diameter of the pin shaft. The pin shaft is sleeved in the central hole (1-5), the pin head is located in the body inner hole (1-6), and its end abuts against the end wall of the central hole (1-5).

5. The built-in liner extraction tool according to claim 4, characterized in that, The diameter of the pin head is 0.2 - 0.4 mm smaller than the inner diameter of the body inner hole (1-6), and the diameter of the pin shaft is 0.2 - 0.4 mm smaller than the inner diameter of the central hole (1-5).

6. The built-in liner extraction tool according to claim 3, characterized in that, The wall thickness of the cylindrical section (1-2) is less than 2.5 mm, and the axial length of the central hole (1-5) is 2 - 4 mm.

7. The built-in liner extraction tool according to claim 2, characterized in that, The axial length of the wedge-shaped notch (1-4) is greater than or equal to the axial length of the conical section (1-1).

8. The built-in liner extraction tool according to claim 2, characterized in that, There are six wedge-shaped notches (1-4), and the six wedge-shaped notches (1-4) are evenly distributed along the circumference of the conical section (1-1).

9. A built-in liner extraction tool according to any one of claims 1-8, characterized in that, It further includes a traction shaft (4). The other end of the shock absorber (3) is fixedly connected to the traction shaft (4).

10. A built-in liner extraction tool according to any one of claims 1-8, characterized in that, It further includes a fixing sleeve (5). The fixing sleeve (5) is fixedly arranged and used for fixedly connecting with a workpiece (7).

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