A tool for securing a downhole pipe cutting apparatus in an oil or gas well

Abstract

This utility model provides a tool for fixing downhole casing misalignment detection equipment in oil and gas wells, specifically enabling the integration and stability of the downhole casing misalignment detection equipment with exploration equipment such as non-magnetic drill collars. It belongs to the field of downhole casing misalignment detection technology for oil and gas wells. The tool includes a centralizer, comprising a fixing ring and a positioning ridge, which allows the detection equipment to cooperate with surrounding equipment; it prevents the detection equipment from tilting within the non-magnetic drill collar, improving detection accuracy. It reduces friction between the detection device and its surroundings, preventing collisions between the detection device and the non-magnetic drill collar. The centralizer has a simple structural design, saves materials, is easy to manufacture, and is more convenient and efficient to use, thus improving work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of underground oil well casing misalignment detection technology, specifically, it relates to a tool for fixing downhole casing breakage detection equipment in oil and gas wells. Background Technology

[0002] During oil and gas field development, casing is required for wellbore support, formation isolation, protection of in-well equipment, pressure control, and optimization of the production path. However, factors such as prolonged production operations, downhole environmental corrosion, casing material and installation defects, and crustal movement can lead to deformation, rupture, and misalignment of the casing in oil and gas wells. When a large displacement misalignment occurs (i.e., the casing breaks and the upper and lower sections are severely disconnected), it not only affects production efficiency but also causes serious environmental problems and safety hazards. Therefore, sealing and repairing wells with large displacement casing damage as early as possible is a necessary condition for ensuring safe production. Before sealing and repairing wells with large displacement casing damage, the key point is to detect the specific location of the fractured or misaligned casing port in the lower section. Before detection, a non-magnetic drill collar and drill pipe must be used to drill along the orientation of the upper casing section to the vicinity of the misalignment location. To improve detection efficiency, once the non-magnetic drill collar reaches the target layer, the detection equipment can be lowered along the inner wall of the drill pipe and fixed inside the non-magnetic drill collar, which meets the length and inner diameter requirements, without having to extract the drill pipe and non-magnetic drill collar from the deep well. Non-magnetic drill collars are drill collar tools primarily made of low-carbon, high-chromium-manganese alloy steel, and one of their core characteristics is low magnetic permeability. Therefore, conducting pipe break detection within a non-magnetic drill collar reduces the impact of the surrounding environment on the detection results.

[0003] However, downhole pipe break detection equipment needs to be parallel to the axis of the non-magnetic drill collar to ensure the accuracy of the detection data. Since the inner diameter of the non-magnetic drill collar is usually larger than the outer diameter of the pipe break detection equipment, it is generally difficult for the equipment to remain parallel to the axis inside the non-magnetic drill collar.

[0004] To ensure the parallelism between the detection equipment and the axis of the non-magnetic drill collar, existing fixing adapters for downhole pipe breakage detection equipment mainly include rigid, elastic, and adjustable adapters. Rigid adapters, made of steel, are simple in structure and high in strength, but lack elasticity, are prone to jamming in complex well sections, and cause severe wear on the drill collar or casing inner wall. Elastic adapters, mostly made of springs or rubber, can adapt to certain wellbore deformations and are easy to install, but the elastic materials are prone to aging and fatigue, resulting in significant performance degradation and a short service life after a period of use. Adjustable adapters can adjust the opening width according to the target size, offering strong adaptability, but their complex structure makes assembly and maintenance difficult and costly, and the adjustment mechanism may fail downhole due to impurities. Designing a reasonable fixing adapter to ensure the parallelism between the detection equipment and the axis of the non-magnetic drill collar significantly improves the reliability of logging data and the equipment's service life. Therefore, there is an urgent need to design a durable, inexpensive, easy-to-install, non-deformable, and long-lasting fixing adapter for downhole pipe breakage detection equipment. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a tool for fixing downhole pipe break detection equipment in oil and gas wells, including a centralizer. The centralizer includes a fixing ring and a positioning ridge. The fixing ring is circular, with the positioning ridge installed on the outer curved surface of the fixing ring and an anti-slip layer installed on the inner curved surface of the fixing ring. The centralizer is installed on the detection equipment.

[0006] The detection device and the stabilizer are used together. If the detection device has a pre-drilled recessed ring for installing the stabilizer, the inner curved side of the stabilizer does not need to be fitted with an anti-slip layer. If the detection device does not have a pre-drilled location for installing the stabilizer, the stabilizer can be split along the diameter of the fixing ring to create separate stabilizers. Screw holes are pre-drilled, and bolts and nuts are used to install the two separate stabilizers onto the detection device. A connecting cable is installed at the end of the detection device, leading to relevant equipment on the ground.

[0007] Furthermore, the number of positioning edges on the outer curved surface of the stabilizer shall not be less than two. If the number of positioning edges is too small, the non-magnetic drill collar at the drill pipe head may be more prone to tilting.

[0008] Furthermore, the straightener is installed on the detection device, and there are no fewer than two straighteners installed on the detection device. At least one straightener is installed at the upper end of the detection device, and at least one straightener is installed at the lower end of the detection device.

[0009] Furthermore, the anti-slip layer is typically double-sided adhesive or a soft sponge with high friction.

[0010] Furthermore, the straightener can be made of rigid plastic and can be manufactured using a 3D printer.

[0011] Furthermore, the lengths of the fixing ring and positioning ridge of the stabilizer can be designed according to the outer diameter of the detection device and the inner diameter of the non-magnetic drill collar of different sizes and models. The inner diameter of the fixing ring of the stabilizer is slightly larger than the outer diameter of the installation position of the detection device; the outer diameter of the fixing ring is slightly smaller than 80% of the inner diameter of the non-magnetic drill collar. The detection device with the stabilizer installed is placed inside the non-magnetic drill collar, and there should also be some gap between the positioning ridge and the inside of the non-magnetic drill collar to ensure that the maximum included angle between the axes of the detection device and the non-magnetic drill collar does not exceed 5° during the detection process of the oil well casing.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) Reducing friction between the detection device and its surroundings, keeping it parallel to the axis of the non-magnetic drill collar, helps to achieve stable operation of the detection device during the detection process; it also protects its safety and prevents the detection device from colliding with the non-magnetic drill collar.

[0014] (2) The centralizer has a simple structural design, the materials are easy to obtain, the price is low, and it is easy to manufacture. The size of each component can be adjusted according to the inner diameter of the drill pipe equipment and the outer diameter of the detection equipment. It is also very simple to install the centralizer on the detection device.

[0015] (3) Most of the materials are plastic products, which perform well in various working environments and will not affect or interfere with the operation of the detection device. They are more convenient and efficient for use in wells. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings required in the implementation will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention, wherein (a) is a top view and (b) is an axial view;

[0019] Figure 3 This is a side view illustrating the overall structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the disassembled structure of the present invention, wherein (a) is an axial view and (b) is a top view;

[0021] Figure 5This is a schematic diagram of the disassembled structure of the present invention, wherein (a) is a perspective view and (b) is a side view;

[0022] Figure 6 This is a schematic diagram of the detachable structure of this utility model installed on the testing equipment;

[0023] Figure 7 This is a schematic diagram of the present invention installed on a testing device with a recessed ring;

[0024] Figure 8 This is a cross-sectional view of the application environment of this utility model inside an oil well casing;

[0025] Figure 9 This is a partial cross-sectional view of the environment in which this utility model is used inside an oil well casing, wherein (a) is Figure 8 A magnified view of a portion of point A in the middle, (b) is... Figure 8 A magnified view of a section at point B in the middle;

[0026] Figure 10 This is a cross-sectional view of the application environment of this utility model inside an oil well casing;

[0027] Figure 11 This is a partial cross-sectional view of the environment in which this utility model is used inside an oil well casing, wherein (a) is Figure 10 A magnified view of a section at point C, (b) is... Figure 10 A magnified view of a section at point B in the middle;

[0028] Figure 12 This is a schematic diagram of the structure of the present invention with two positioning edges, where (a) is an axial view and (b) is a top view;

[0029] Figure 13 This is a schematic diagram of the structure of the present invention with three positioning edges, where (a) is an axial view and (b) is a top view;

[0030] Figure 14 This is a schematic diagram of the structure of the present invention with six positioning edges, where (a) is a top view and (b) is an axial view;

[0031] The markings in the diagram are: 1. Centralizer; 101. Fixing ring; 102. Positioning ridge; 103. Anti-slip layer; 1021. Screw hole; 2. Detection equipment; 201. Connecting line; 202. Concave ring; 3. Drill pipe; 4. Non-magnetic drill collar; 5. Weighted drill pipe; 6. Oil well casing; 7. Drill bit; 8. Disconnected oil well casing. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown herein can generally be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this utility model provided below is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0033] The embodiments of this utility model will be further described below with reference to the accompanying drawings, such as... Figure 1-14 As shown, this utility model provides a tool for fixing a downhole pipe break detection device for oil and gas wells, including a centralizer 1. The centralizer 1 includes a fixing ring 101 and a positioning ridge 102. The fixing ring 101 is annular. The positioning ridge 102 is installed on the outer curved surface of the fixing ring 101, and an anti-slip layer 103 is installed on the inner curved surface of the fixing ring 101. The centralizer 1 is installed on the detection device 2.

[0034] The detection device 2 and the centralizer 1 are used together. The end of the detection device 2 is equipped with a connecting cable 201 leading to relevant equipment on the ground; such as... Figure 7 As shown, if the detection device 2 has a recessed ring 202 for installing the stabilizer 1, then the anti-slip layer 103 may not be installed on the inner side of the stabilizer 1; Figure 4-6 As shown, if there is no reserved position for installing the centralizer 1 on the detection device 2, the centralizer 1 can be separated along the diameter of the fixing ring 101 to make separate centralizer 1, with the screw hole 1021 reserved, and the two separate centralizers 1 can be installed on the detection device 2 using bolts and nuts.

[0035] The lengths of the fixing ring 101 and the positioning ridge 102 can be designed according to the outer diameter of the detection device 1 and the inner diameter of the non-magnetic drill collar 4 of different sizes and models. The inner diameter of the fixing ring 101 of the centralizer 1 is slightly larger than the outer diameter of the installation position of the detection device 2; the outer diameter of the fixing ring 101 is slightly smaller than 80% of the inner diameter of the non-magnetic drill collar. The detection device 2, on which the centralizer 1 is installed, is placed inside the non-magnetic drill collar 4, and there should also be some gap between the positioning ridge 102 and the inside of the non-magnetic drill collar 4 to ensure that the maximum included angle between the axes of the detection device 2 and the non-magnetic drill collar 4 does not exceed 5° during the detection process of the oil well casing 6.

[0036] The straightener 1 can be made of rigid plastic, which can be manufactured using a 3D printer, such as PLA (polylactic acid) or ABS plastic (a terpolymer of acrylonitrile (A), butadiene (B), and styrene (S) monomers). If the straightener 1 needs to be separated, a simulation model of the separated straightener 1 can be made in advance, such as... Figure 4 and 5 As shown, the separate stabilizers 1 are then directly fabricated using a 3D printer. The anti-slip layer 103 is typically double-sided tape or a soft sponge with high friction. For the double-sided tape, a thicker than 1mm and a softer, more viscous double-sided tape is chosen. To fabricate the stabilizer 1, first use a 3D printer to create the fixing ring 101 and positioning ridge 102. Then, depending on the actual situation, decide whether to install or attach the anti-slip layer 103.

[0037] like Figure 6 As shown, no fewer than two stabilizers 2 are installed on the detection device 1. At least one stabilizer 2 is installed on the upper end of the detection device 1 and at least one stabilizer 2 is installed on the lower end of the detection device 1. This is to ensure that the detection device 1 is parallel to the axis of the non-magnetic drill collar 4.

[0038] like Figure 8-11 As shown, if a break or misalignment is found in the oil well casing 6, detection equipment 2 is required for detection. The detection process is generally as follows: the drill pipe 3, equipped with a weighted drill pipe 5 and a non-magnetic drill collar 4, is first inserted into the oil well casing 6. The front end of the drill pipe is the non-magnetic drill collar 4, and the front end of the non-magnetic drill collar 4 is the weighted drill pipe 5. The drill bit 7 and other related equipment are installed at the front end of the weighted drill pipe 5. As the weighted drill pipe 5 and the drill bit 7 gradually descend, the length of the drill pipe 3 is continuously increased, and the descent depth is recorded. When a possible break in the oil well casing 8 is detected, the weighted drill pipe 5 and the drill bit 7 will stop descending, and the detection equipment 2, equipped with a stabilizer 1, will be placed inside the drill pipe 3 until the detection equipment 2 enters the non-magnetic drill collar 4 (considering the low magnetic permeability of the non-magnetic drill collar 4 and the descent height, the entry of the detection equipment 2 into the non-magnetic drill collar 4 can be measured on the ground; this is existing technology and will not be elaborated further), and the location of the break in the oil well casing 8 will be measured. The connecting line 201 at the end of the detection device 2 is generally made of a thinner cable than the detection device 2. The detection device 2 is sent underground by releasing the connecting line 201 on the ground. The other end of the connecting line 201 is connected to relevant equipment on the ground, which can transmit the data detected by the detection device 2.

[0039] After the detection is completed, the connecting line 201 is pulled to pull out the drill pipe 3 of the detection device 2. Then, the weighted drill pipe 5, the non-magnetic drill collar 4, the drill bit 7, and the drill pipe 3 are pulled out, and then the next location where the well casing 6 may break or misalign is measured is moved. Throughout the detection process, because the downhole casing breakage detection device 2 is relatively expensive, the centralizer 1 is installed on it to avoid direct contact between the downhole casing breakage detection device 2 and other devices, thus protecting the detection device 2 and reducing the risk of damage.

[0040] The number of positioning ridges 102 on the outer curved surface of the stabilizer 1 shall not be less than two. If the number of positioning ridges 102 is too small, the detection device 1 may tilt more easily inside the non-magnetic drill collar 4 at the head of the drill rod 3. Typically, the positioning ridges 102 on the outer side of the fixing ring 101 are four evenly spaced ridges. Alternatively, the appropriate number of positioning ridges 102 can be selected for the stabilizer 1 based on the friction and inner diameter of the drill rod 3 and the non-magnetic drill collar 4 in the actual operating environment. If the friction on the inner wall is large, a stabilizer with two or three positioning ridges 102 can be used, such as... Figure 12 and 13 As shown; if the friction of its inner wall is large, and its inner diameter is relatively large compared to the outer diameter of the detection device 1, a stabilizer with six or more positioning ridges 102 can be used, such as Figure 14 As shown.

[0041] All standard parts used in this invention can be purchased from the market, and each component can be customized according to the description and drawings.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit it. Although preferred embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A tool for fixing downhole pipe break detection equipment in oil and gas wells, characterized in that, include: The straightener (1) includes a fixing ring (101) and a positioning ridge (102). The fixing ring (101) is circular. The positioning ridge (102) is installed on the outer curved surface of the fixing ring (101). The anti-slip layer (103) is installed on the inner curved surface of the fixing ring (101). The straightener (1) is installed on the detection device (2).

2. A tool for securing a pipe-stopping device in a well, according to claim 1, characterized in that The number of positioning edges (102) on the outer curved surface of the straightener (1) is not less than two.

3. The tool of claim 1, wherein, The detector (2) is equipped with no fewer than two centralizers (1).

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