Drift size gauge tool

Abstract

The utility model relates to the technical field of tools for oilfield exploitation and well repair, in particular to a drift size gauge tool. The drift size gauge tool comprises an inner pipe and a drift size pipe sleeved outside the inner pipe, an oil pipe connecting structure is arranged on the upper portion of the inner pipe, the drift size pipe and the inner pipe are relatively fixed through an upper pin, a contraction joint penetrating downwards to the bottom face of the drift size pipe is arranged on the lower portion of the drift size pipe, and a hooking structure used for being matched with the upper portion of the drift size pipe in a hooking mode when the inner pipe ascends is arranged on the inner pipe. A sliding rail which obliquely extends inwards from top to bottom is arranged at the position, below the hooking structure, of the inner pipe, a supporting block is installed on the sliding rail in a sliding and anti-falling mode, and a lower pin is installed on the drifting pipe to fix the supporting block to the upper position so that the supporting block can support the drifting pipe from the inner side. A stopping structure used for stopping the supporting block in an anti-falling mode when the supporting block slides downwards is arranged on the inner pipe and located below the sliding rail. When the drifting pipe is clamped, the inner pipe is lifted upwards to achieve automatic unfreezing, and unfreezing operation is not needed.

Description

Technical Field

[0001] This utility model relates to the technical field of tools for oilfield well workover, and in particular to a well gauge. Background Technology

[0002] During oilfield development, various factors often cause downhole casing to experience diameter reduction, bending deformation, and burrs; some may even crack or break, frequently resulting in stuck downhole tools. To understand the wellbore condition during workover, it is necessary to run a well gauge of appropriate diameter to check for changes in the casing's inner diameter. When large-diameter tools such as packers need to be run, well cleaning operations are also required. During well cleaning, traditional well gauges are prone to getting stuck at deformed areas of the casing or encountering other obstructions, causing accidents. Unblocking operations are then required to remove the gauge, increasing the operational procedures and the difficulty of well workover. Utility Model Content

[0003] The purpose of this utility model is to provide a well gauge to solve the problem that traditional well gauges cannot automatically unblock when stuck, requiring unblocking operations.

[0004] The present invention adopts the following technical solution:

[0005] A well-gauge includes an inner tube and a well-gauge sleeve fitted outside the inner tube. The upper part of the inner tube is provided with a tubing connection structure. The well-gauge sleeve is fixed to the inner tube by an upper pin. The lower part of the well-gauge sleeve is provided with a contraction joint extending downward to the bottom surface of the well-gauge sleeve. The inner tube is provided with a hook structure for forming a hook engagement with the upper part of the well-gauge sleeve when the inner tube moves upward. Below the hook structure, the inner tube is provided with a slide rail extending downward and inward at an incline. A support block is slidably installed on the slide rail and is designed to prevent detachment. A lower pin is installed on the well-gauge sleeve to fix the support block in the upper position so that the support block supports the well-gauge sleeve from the inside. Below the slide rail, the inner tube is provided with a stop structure for preventing the support block from detaching when it slides downward.

[0006] Furthermore, the slide rail is a dovetail-shaped track.

[0007] Furthermore, on the outer circumference of the inner tube, below the hook structure, there is a dovetail-shaped protrusion extending downward and inward at an incline. The dovetail-shaped protrusion forms the dovetail-shaped track. The support block is provided with a dovetail-shaped groove extending downward and inward at an incline. The support block is slidably mounted on the dovetail-shaped protrusion through the dovetail-shaped groove.

[0008] Furthermore, the support block is arc-shaped, and the outer circumferential surface of the support block fits against the inner wall of the well pipe. An arc-shaped groove extending along the circumference of the support block is provided on the outer circumferential surface of the support block, and the inner end of the lower pin extends into the arc-shaped groove to fix the support block in the upper position.

[0009] Furthermore, there are three or more slide rails that are evenly spaced in the circumferential direction, and the number of support blocks is equal to that of the slide rails and they correspond one-to-one.

[0010] Furthermore, the contraction joint extends axially along the well pipe and the joint width gradually increases from top to bottom.

[0011] Furthermore, a retaining ring is fixedly connected to the lower end of the inner tube, and the retaining ring constitutes the aforementioned blocking structure.

[0012] Furthermore, the retaining ring is threaded to the lower end of the inner tube.

[0013] Furthermore, an annular shoulder is provided on the lower outer circumference of the inner tube. The outer diameter of the annular shoulder is larger than the inner diameter of the upper part of the well pipe, and the annular shoulder constitutes the hook structure.

[0014] Furthermore, the inner tube includes a central tube and a tubing coupling connected to the upper end of the central tube. The tubing coupling constitutes the tubing connection structure, and the well pipe is fixed relative to the tubing coupling by an upper pin.

[0015] Beneficial Effects: This utility model is a pioneering invention. The well-clearing pipe is fixed to the inner pipe by an upper pin. The lower part of the well-clearing pipe has a contraction joint extending downwards to the bottom surface, allowing the lower part of the well-clearing pipe to have space for inward deformation. A support block is fixed in the upper position by a lower pin, allowing the support block to support the well-clearing pipe from the inside, improving the strength of the well-clearing pipe. After connecting to the tubing, the well gauge is lowered into the casing. When the well-clearing pipe is stuck, the inner pipe is lifted to shear the upper pin. The inner pipe moves upwards, and the lower pin is sheared or separated from the support block, releasing the restriction on the support block. The support block slides downwards and inwards along the slide rail. The lower part of the inner pipe loses the constraint on the contraction joint of the lower part of the well-clearing pipe, allowing the lower part of the well-clearing pipe to contract inwards and reduce its shape, thus separating the well-clearing pipe from the deformed casing and achieving unsticking without the need for unsticking operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the well gauge of this utility model;

[0017] Figure 2 for Figure 1 Sectional view at point AA;

[0018] Figure 3 This is a schematic diagram of the well casing being deployed.

[0019] Figure 4 This is a schematic diagram after the well gauge has been removed.

[0020] In the diagram: 1. Tubing coupling; 2. Upper pin; 3. Well access pipe; 4. Center pipe; 5. Contraction joint; 6. Annular shoulder; 7. Support block; 8. Lower pin; 9. Slide rail; 10. Retaining ring; 11. Arc-shaped groove. Detailed Implementation

[0021] Traditional well gauges cannot self-unstick when stuck, requiring manual unsticking operations to remove them, increasing the workload and difficulty of well repair. The well gauge provided by this invention can self-unstick, eliminating the need for manual unsticking. The basic inventive concept is as follows: a well-tracing pipe is fitted over an inner tube, fixed to the inner tube by pins. A contraction joint is provided at the lower part of the well-tracing pipe. A support block is slidably installed on the inner tube and temporarily fixed in the upper position, supporting the well-tracing pipe from the inside. When the well-tracing pipe becomes stuck, the inner tube can be lifted to cut the pins, allowing the inner tube to move upwards. The support block slides down, releasing its support on the well-tracing pipe. The lower part of the inner tube loses its constraint on the contraction joint at the lower part of the well-tracing pipe, allowing the lower part of the well-tracing pipe to retract inwards, thus unsticking the gauge.

[0022] Based on the above inventive concept, the embodiments of this utility model are described in detail below.

[0023] like Figure 1 As shown, the wellbore gauge includes an inner tube and a wellbore tube 3. The wellbore tube 3 is fitted over the inner tube and fixed to it by an upper pin 2. The inner tube includes a central tube 4 and a tubing coupling 1 connected to the upper end of the central tube 4. The tubing coupling 1 is used to connect the tubing. The wellbore tube 3 has a contraction joint 5 extending downwards to the bottom surface of the wellbore tube 3, as shown in the figure. Figure 3 As shown, contraction joint 5 has multiple joints that are evenly distributed at intervals around the circumference of the well casing 3. (Reference) Figure 1 An annular shoulder 6 is provided on the lower outer circumference of the inner tube. The outer diameter of the annular shoulder 6 is larger than the inner diameter of the upper part of the well-connecting pipe 3. The annular shoulder 6 is used to hook and engage with the upper part of the well-connecting pipe 3 when the inner tube moves upward, thereby bringing the well-connecting pipe 3 out of the well together. Below the annular shoulder 6, the inner tube has a slide rail 9 extending downward and inward at an incline. A support block 7 is slidably installed on the slide rail 9 and is designed to prevent detachment. The support block 7 can only slide on the slide rail 9 and cannot detach from it. When the support block 7 slides on the slide rail 9, it has an upper and a lower position. When the support block 7 is in the upper position, it can support the well-connecting pipe 3 from the inside. A lower pin 8 is installed on the well-connecting pipe 3. The support block 7 is fixed in the upper position by the lower pin 8 so that the support block 7 can support the well-connecting pipe 3 from the inside. Below the slide rail 9, the inner tube has a stop structure to prevent the support block 7 from detaching when it slides down, preventing the support block 7 from falling and causing debris to fall into the well. The stopping structure is specifically a retaining ring 10. The lower end of the inner tube has an external thread, and the retaining ring 10 is threadedly connected to the lower end of the inner tube. The structure is simple and easy to assemble. The retaining ring 10 can simultaneously prevent all support blocks 7 from detaching, simplifying the structure and facilitating installation.

[0024] like Figure 2As shown, the slide rail 9 is a dovetail-shaped track. The dovetail shape is easy to manufacture and provides good anti-detachment performance after assembly with the support block 7. Specifically, a dovetail-shaped protrusion extending downwards and inwards is provided on the outer circumference of the inner tube below the annular shoulder 6. This protrusion forms the dovetail-shaped track. The support block 7 has a dovetail-shaped groove extending downwards and inwards, which slides on the dovetail protrusion. Alternatively, a dovetail-shaped groove extending downwards and inwards can be provided on the outer circumference of the inner tube below the annular shoulder 6, and a dovetail-shaped protrusion extending downwards and inwards can be provided on the support block 7. The support block 7 slides on the dovetail protrusion within the dovetail groove.

[0025] The support block 7 is arc-shaped, with its inner circumferential surface fitting against the outer wall of the inner tube and its outer circumferential surface fitting against the inner wall of the well-through pipe 3. This provides a large contact area between the support block 7 and the well-through pipe 3, enhancing the support effect and increasing the strength of the well-through pipe 3. An arc-shaped groove 11 extending circumferentially along the outer circumference of the support block 7 is provided. The inner end of the lower pin 8 extends into the arc-shaped groove 11, forming a stop with the upper side wall of the groove 11, thereby fixing the support block 7 in its upper position. The well-through pipe 3 has a threaded hole, and the lower pin 8 is threaded into the threaded hole and extends inward into the arc-shaped groove 11 on the support block 7. Because the support block 7 is located inside the well-through pipe 3, it is difficult to observe from the outside whether the lower pin 8 aligns with the insertion part on the support block 7. To ensure that the lower pin 8 can be smoothly inserted into the insertion part on the support block 7, higher assembly precision is required for the support block 7 on the slide rail 9, and higher machining precision is required for the components. By providing an arc-shaped groove 11 extending circumferentially on the outer peripheral surface of the support block 7, compared with providing an insertion hole on the support block 7, the lower pin 8 can easily align with the arc-shaped groove 11, making it easier for the inner end of the lower pin 8 to be quickly inserted into the arc-shaped groove 11, reducing the requirements for the machining accuracy and assembly accuracy of the workpiece, and making assembly more convenient.

[0026] like Figure 2 As shown, the inner tube has three slide rails 9 evenly distributed circumferentially, and the number of support blocks 7 is equal to that of the slide rails 9, with each block corresponding to one another. The evenly distributed support blocks 7 circumferentially provide uniform support for the well-connected pipe 3, which is beneficial for improving the strength of the well-connected pipe 3 and meeting well-connection requirements. The number of support blocks 7 is designed according to the radial dimension of the well-connected pipe 3; it can be two, three, four, or more, or it can be just one. When there is only one support block 7, it can be an annular support block.

[0027] like Figure 1 , Figure 3As shown, the contraction joint 5 extends axially along the well pipe 3 and the joint width gradually increases from top to bottom. The advantage of this design is that the lower part of the well pipe 3 contracts more significantly, which is more conducive to the contraction of the lower part of the well pipe 3. Of course, in other embodiments, the contraction joint 5 can also be a strip joint with a constant width from top to bottom.

[0028] The number and width of contraction joints 5 are determined by dividing the difference in circumference of the well pipe 3 before and after the diameter change by the number or width of joints.

[0029] During application, the well gauge is connected to the tubing and lowered along with the tubing. During the well cleaning process, the support block 7 consistently supports the lower inner wall of the well gauge 3, increasing its strength. If the well gauge 3 becomes stuck due to deformed casing or other reasons, the inner tube is pulled up to shear the upper pin 2. Figure 4 As shown, the inner tube moves upward. Due to the sliding of the support block 7 and its anti-disengagement installation on the inclined slide rail 9, the support block 7 will slide downward and inward along the slide rail 9. During this process, the lower pin 8 may be sheared or may not be sheared but simply disengaged from the support block 7. The support block 7 slides down, releasing its support on the well pipe 3. The retaining ring 10 forms an anti-disengagement stop on the support block 7 from below, pulling the lower part of the inner tube out from the lower part of the well pipe 3. The lower part of the inner tube loses its constraint on the lower contraction joint 5 of the well pipe 3, allowing the lower contraction joint 5 of the well pipe 3 to contract inward and reduce its shape. The well pipe 3 can then disengage from the deformed casing, achieving unblocking. After moving upward a certain distance, the inner tube forms a hook engagement with the upper part of the well pipe 3, thereby bringing the well pipe 3 out of the well together. This utility model well gauge can automatically unblock when stuck, without the need for other unblocking operations. It is simple to operate, convenient to use, safe and reliable, and has significant economic benefits.

[0030] Of course, this utility model is not limited to the embodiments described above.

[0031] In the above embodiment, the slide rail is a dovetail-shaped track. In other embodiments, the slide rail can also be a rectangular track, with a rectangular constriction groove extending downward and inward on the lower side of the annular shoulder on the inner tube. The rectangular constriction groove is the rectangular track. A rectangular protrusion extending downward and inward is provided on the support block. The rectangular protrusion is slidably and anti-detachedly installed in the rectangular constriction groove.

[0032] In the above embodiment, an arc-shaped groove extending circumferentially along the outer periphery of the support block is provided, and the inner end of the lower pin extends into the arc-shaped groove to fix the support block in the upper position, making assembly relatively convenient. In other embodiments, a socket can also be provided on the outer periphery of the support block, so that the inner end of the lower pin extends into the socket to fix the support block in the upper position.

[0033] In the above embodiment, a retaining ring is fixedly connected to the lower end of the inner tube to prevent the support block from slipping off when it slides down, thus avoiding the generation of objects falling into the well. In other embodiments, multiple retaining blocks can also be arranged at intervals along the circumference at the lower end of the inner tube to prevent the support block from slipping off.

[0034] In the above embodiment, the retaining ring is threaded to the lower end of the inner tube. In other embodiments, the retaining ring can also be fixedly connected to the inner tube by bolts or by welding.

[0035] In the above embodiments, an annular shoulder is provided on the lower outer circumferential surface of the inner tube. The outer diameter of the annular shoulder is larger than the inner diameter of the upper part of the well access pipe. When the inner tube moves upward, the annular shoulder hooks with the upper part of the well access pipe to bring the well access pipe out of the well. In other embodiments, multiple protrusions can be provided circumferentially at intervals on the lower outer circumferential surface of the inner tube. When the inner tube moves upward, each protrusion hooks with the upper part of the well access pipe to bring the well access pipe out of the well. In this case, the protrusions constitute a hook structure. In other embodiments, a collar can be threaded onto the inner tube. The outer diameter of the collar is larger than the inner diameter of the upper part of the well access pipe. When the inner tube moves upward, the collar hooks with the upper part of the well access pipe to bring the well access pipe out of the well. In this case, the collar constitutes a hook structure.

[0036] In the above embodiment, the inner tube includes a central tube and a tubing coupling connected to the upper end of the central tube, and the through-hole pipe is fixed to the tubing coupling by an upper pin. In other embodiments, the through-hole pipe can also be fixed to the central tube by an upper pin. Of course, when the central tube and tubing are compatible, the tubing coupling may not be provided, and a threaded structure may be provided on the upper part of the central tube for direct connection to the tubing.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A well gauge, characterized in that: The system includes an inner tube and a well-through pipe that is fitted over the inner tube. The upper part of the inner tube has a tubing connection structure. The well-through pipe is fixed to the inner tube by an upper pin. The lower part of the well-through pipe has a contraction joint that extends downward to the bottom surface of the well-through pipe. The inner tube has a hook structure for hooking with the upper part of the well-through pipe when the inner tube moves upward. Below the hook structure, the inner tube has a slide rail that extends downward and inward at an incline. A support block is installed on the slide rail to prevent it from slipping off. A lower pin is installed on the well-through pipe to fix the support block in the upper position so that the support block supports the well-through pipe from the inside. Below the slide rail, the inner tube has a stop structure to prevent the support block from slipping off when it slides down.

2. The well gauge according to claim 1, characterized in that: The slide rail is a dovetail-shaped track.

3. The well gauge according to claim 2, characterized in that: On the outer circumference of the inner tube, below the hook structure, there is a dovetail-shaped protrusion extending downward and inward at an incline. The dovetail-shaped protrusion forms the dovetail-shaped track. The support block is provided with a dovetail-shaped groove extending downward and inward at an incline. The support block is slidably mounted on the dovetail-shaped protrusion through the dovetail-shaped groove.

4. The well gauge according to any one of claims 1-3, characterized in that: The support block is arc-shaped, and its outer circumferential surface fits against the inner wall of the well pipe. The outer circumferential surface of the support block is provided with an arc-shaped groove extending along the circumference of the support block. The inner end of the lower pin extends into the arc-shaped groove to fix the support block in the upper position.

5. The well gauge according to any one of claims 1-3, characterized in that: The slide rails are provided in three or more parts and are evenly distributed in the circumferential direction. The number of support blocks is equal to that of the slide rails and they correspond one-to-one.

6. The well gauge according to any one of claims 1-3, characterized in that: The contraction joint extends along the well pipe axis and the joint width gradually increases from top to bottom.

7. The well gauge according to any one of claims 1-3, characterized in that: A retaining ring is fixedly connected to the lower end of the inner tube, and the retaining ring constitutes the aforementioned blocking structure.

8. The well gauge according to claim 7, characterized in that: The retaining ring is threaded to the lower end of the inner tube.

9. The well gauge according to any one of claims 1-3, characterized in that: An annular shoulder is provided on the lower outer circumference of the inner tube. The outer diameter of the annular shoulder is larger than the inner diameter of the upper part of the well pipe. The annular shoulder constitutes the hook structure.

10. The well gauge according to any one of claims 1-3, characterized in that: The inner tube includes a central tube and a tubing coupling connected to the upper end of the central tube. The tubing coupling constitutes the tubing connection structure, and the well pipe is fixed to the tubing coupling by an upper pin.

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