Anti-sticking and straightening pipe column

Abstract

The present application relates to a kind of anti-jamming shaping pipe column, belong to the technical field of damaged casing repair in petroleum engineering.It includes a plurality of anti-jamming shaping device connected head to tail, anti-jamming shaping device includes center tube and the anti-jamming expansion head of center tube outer sleeve;Center tube upper end has the upper connecting end for connecting upper pipe column, lower end has the lower connecting end for connecting lower pipe column, upper connecting end and lower connecting end form the outer taper surface of upper thick lower thin, and straight pipe section is formed between outer taper surface and lower connecting end;Anti-jamming expansion head includes the expansion shaping portion for expanding shaping casing and the base portion connected expansion shaping portion, expansion shaping portion is opened with the cutout for expansion along axial direction;Base portion is slidably arranged on the straight pipe section, and the diameter change of expansion shaping portion is realized by the action of outer taper surface to the inner surface of expansion shaping portion.Expansion shaping can be carried out using this kind of structure pipe column to casing, can solve the problem that shaping pipe column is stuck due to casing rebound, and simultaneously improve casing shaping efficiency.

Description

Technical Field

[0001] This invention relates to an anti-jamming shaping tubing string, belonging to the field of damaged casing repair technology in petroleum engineering. Background Technology

[0002] As oilfields have been in development for many years, and due to the combined effects of geological and engineering factors, many oil and water wells have experienced casing deformation during production. This results in wells operating with defects or becoming idle, making it impossible to implement technological measures, leading to a decline in oil and gas production, reduced recovery rates, and decreased profitability.

[0003] In impact-type casing reshaping, lead stamping is required to determine the casing diameter reduction data. For cases with large casing deformation, reshaping devices of different sizes need to be replaced in multiple trips according to the inner diameter of the deformed section to repair the casing step by step until the engineering requirements are met. This type of reshaping requires multiple trips of tubing string, greatly increasing the operation cycle, resulting in low overall well workover efficiency and a high risk of tubing string jamming. The Chinese utility model patent authorization announcement (CN205172499U) discloses an impact-type multi-stage reshaping device. The main body and the expansion section adopt an integrated structural design, with multi-stage expansion sections increasing sequentially from bottom to top. A single tubing string trip can expand the inner diameter of the deformed casing in multiple stages, improving reshaping efficiency. However, this device has some drawbacks in use. The deformed section of the casing may rebound during the reshaping process, easily causing the reshaping device to jam, especially in multi-stage expansion, where the risk of jamming is even greater, potentially complicating well operations due to accidents. Furthermore, the device cannot be disassembled and reassembled, limiting its practicality. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-jamming shaping tube string to solve the problem of the shaping tool getting stuck when repairing sleeves in the prior art.

[0005] To achieve the above objectives, the technical solution and beneficial effects of the present invention include:

[0006] This invention discloses an anti-jamming shaping tubing string, comprising a plurality of anti-jamming shaping devices connected end-to-end. Each anti-jamming shaping device includes a central tube and an anti-jamming expansion head fitted over the central tube. The central tube has an upper connecting end for connecting to an upper-level tubing string at its upper end and a lower connecting end for connecting to a lower-level tubing string at its lower end. An outer conical surface, wider at the top and narrower at the bottom, is formed between the upper connecting end and the lower connecting end, forming a straight pipe section. The anti-jamming expansion head includes an expansion shaping part for expanding and shaping the tubing and a base connecting the expansion shaping part. The expansion shaping part has an axially oriented slit for expansion. The base is slidably fitted onto the straight pipe section, and the diameter of the expansion shaping part is changed by the action of the outer conical surface on the inner surface of the expansion shaping part.

[0007] The beneficial effects of the above technical solution are as follows: In this invention, an anti-jamming expansion head is slidably fitted outside the central tube. During the lowering of the shaping tubing, the conical surface on the central tube expands the anti-jamming expansion head, which has a notch, thus achieving tubing shaping. When the shaping tubing is lifted, upon encountering the tubing's springback portion, the interaction between the springback portion and the anti-jamming expansion head causes the anti-jamming expansion head to move away from the conical surface of the central tube, reducing its outer diameter and facilitating faster lifting of the tubing. This invention achieves a change in the outer diameter of the expansion shaping portion by utilizing the action of the outer conical surface of the central tube on the inner surface of the anti-jamming expansion head, solving the problem of tubing jamming due to tubing springback in existing tubing shaping techniques, while simultaneously improving tubing shaping efficiency.

[0008] As a further improvement to the method, the anti-jamming shaping device also includes a spring sleeved on the straight section of the central tube for generating a force on the anti-jamming expansion head to move toward the outer conical surface.

[0009] The beneficial effects of the above technical solution are as follows: a spring is fitted on the straight section of the central tube. When the tube is lowered into the shaping column, the spring acts on the anti-jamming expansion head, causing the anti-jamming expansion head to expand and jam on the conical surface of the central tube, which facilitates the shaping of the casing.

[0010] As a further improvement to the method, the inner surface of the expansion shaping part is an inner conical surface that contacts and engages with the outer conical surface.

[0011] The beneficial effects of the above technical solution are: through the mutual cooperation of the inner and outer conical surfaces, the expansion and shaping part of the anti-jamming head can be opened more smoothly.

[0012] As a further improvement to the method, in order to achieve better guidance, the outer surface of the expansion shaping part is an elliptical arc surface.

[0013] As a further improvement to the method, in order to achieve a more compact structural relationship, the outer conical surface is formed at the lower part of the upper connecting end.

[0014] As a further improvement to the method, the anti-jamming shaping tube column includes a multi-stage anti-jamming shaping device. Two adjacent anti-jamming shaping devices are connected by a connecting pipe and a variable thread connector. The lower end of the connecting pipe is threaded to the upper connecting end of the central tube, and the upper end of the connecting pipe is connected to the lower connecting end of the adjacent anti-jamming shaping device through a variable thread connector.

[0015] The beneficial effects of the above technical solution are as follows: By connecting multiple anti-jamming shaping devices through connecting pipes and variable thread couplings, multi-stage shaping of the anti-jamming devices can be achieved, avoiding multiple trips of the casing string and improving the efficiency of casing shaping. At the same time, connecting multiple anti-jamming shaping devices through interconnected threaded connecting pipes and variable thread couplings facilitates disassembly and assembly, increasing the practicality of the device.

[0016] As a further improvement to the method, the spring is a compression spring, which is disposed between the annular groove on the upper end face of the variable snap joint and the annular groove on the lower end face of the base of the anti-jamming expansion head.

[0017] The beneficial effects of the above technical solution are: fixing the position of the compression spring by the ring groove prevents the compression spring from moving and increases the reliability of the device.

[0018] As a further improvement to the method, the anti-jamming device also includes a guide head, which is connected to the lowest end of the shaping column using a variable-thread connector, and its lower surface is an arc surface for guidance.

[0019] The beneficial effects of the above technical solution are: the guide head with arc-shaped surface can guide the shaping device to quickly achieve the shaping.

[0020] As a further improvement to the method, the central tube, connecting tube and variable thread connector are provided with interconnected through holes along the axial direction. The through hole of the variable thread connector used to connect the guide head is connected to the cavity of the guide head, and the arc surface of the lower surface of the guide head is provided with a drain hole that connects to the cavity.

[0021] The beneficial effects of the above technical solution are as follows: the central tube, connecting tube and variable thread joint are provided with interconnected through holes along the axial direction, and the guide head is provided with a drain hole that connects the through holes, which can realize the cleaning of the sleeve.

[0022] As a further improvement to the method, the axis of the drain hole is at a certain angle to the central axis of the guide head.

[0023] The beneficial effects of the above technical solution are: the axis of the drain hole is at a certain angle to the axis of the sleeve, which can form a reverse liquid flow in the annulus to achieve flushing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of section AA in the middle;

[0026] Figure 3 This is a schematic diagram of the anti-jamming head of the present invention;

[0027] Figure 4 This is a schematic diagram of the guide head of the present invention.

[0028] The markings in the diagram are as follows: 1. Guide head; 1-1. Drain hole; 2. Lower transformer connector; 3. Spring; 4. Anti-jamming head; 5. Central shaft; 6. Connecting pipe; 7. Upper transformer connector; 8. Secondary shaping device; 9. Tertiary shaping device. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] The purpose of this invention is to provide an anti-sticking forming string. By designing a multi-stage anti-sticking device combination, the forming string can be run into multiple anti-sticking forming devices at once, achieving single-trip forming of multiple points and sections of the casing downhole, reducing the number of string tripping operations and lowering operating costs. Simultaneously, the device incorporates an anti-sticking design; the expansion head can retract upon encountering sticking, allowing for smooth retrieval and preventing stuck drill accidents.

[0031] An embodiment of an anti-jamming shaping tubing:

[0032] like Figure 1 As shown, in this embodiment, the multi-stage anti-jamming shaping column consists of a guide head 1, a lower variable thread connector 2, a spring 3, an anti-jamming expansion head 4, a central shaft 5, a connecting pipe 6, an upper variable thread connector 7, a secondary shaping device 8, and a tertiary shaping device 9. The outer conical surface of the central shaft 5 mates with the inner surface of the expansion head 3. The lower variable thread connector 2 is connected to the external thread at the end of the central shaft 5 via an internal thread. The spring 3 has two ends that contact the end faces of the anti-jamming expansion head 4 and the variable thread connector 2, respectively. The anti-jamming shaping devices 8 and 9, as well as other multi-stage components, are connected in series via the connecting pipe 6 and the variable thread connector 7. The guide head 1 is placed at the lower end of the column, and its upper part is threadedly connected to the variable thread connector 2.

[0033] Specifically, such as Figure 1 and Figure 4 As shown, the outer surface of the guide head 1 is arc-shaped, the interior is hollow, the upper end is provided with internal threads, and the lower end face is provided with evenly distributed drainage holes 1-1.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the anti-jamming head 4 has a hollow structure, with the upper outer surface being an elliptical arc (major-minor axis ratio of 1:2.5) and the lower outer surface being a cylindrical surface. Figure 2 for Figure 1 A schematic diagram of the cross-section of the anti-jamming expansion head in the anti-jamming shaping column shows that the arc surface has a certain number of through grooves (also known as: cuts), and the expansion joints of the grooves extend to the cylindrical surface, allowing the diameter of the expansion head to be variable. The upper inner surface of the expansion head is a conical surface, which contacts and fits with the outer surface of the main central shaft. The front end face of the expansion head has an annular groove for placing the spring 3. The outer arc surface of the anti-jamming expansion head 4 is available in various sizes and models.

[0035] like Figure 1 As shown, the central shaft 5 is a hollow structure with internal and external threads at both ends that mate with the connecting pipe, and an external conical surface in the middle.

[0036] like Figure 1As shown, both ends of the variable thread connector 2 and variable thread connector 7 are threaded, and the whole is used for the variable thread connection of the pipe column to meet the needs of multi-stage series operation.

[0037] like Figure 1 As shown, the connecting pipe 6 is a hollow cylindrical structure with threads at both ends.

[0038] like Figure 1 As shown, in the multi-level anti-jamming device combination (anti-jamming device 8, 9, ... n), all components can be freely connected and matched.

[0039] The multi-stage anti-jamming shaping tubing used in this embodiment is employed for casing lowering. The process and results are as follows:

[0040] 1) Combination of multi-stage anti-jamming and shaping devices: Based on the inner diameter of the sleeve and engineering requirements, using 5 1 Taking a 2-inch bushing transformer as an example, for thick-walled bushings (10.54mm), which are difficult to shape, a 2mm combination anti-jamming head 4 is selected; for medium-thickness bushings (9.17mm), a 3mm combination anti-jamming head 4 is selected; for thin-walled bushings (7.72mm), which are easier to shape and have less springback, a 4mm combination anti-jamming head 4 is selected. Based on the inner diameter of the bushing transformer, first-level, second-level, third-level… anti-jamming devices are selected in series until the required diameter is reached, with a maximum shaping depth of 2mm below the normal inner diameter of the bushing.

[0041] 2) Lowering the tubing string: The multi-stage anti-jamming shaping tubing string is lowered into the casing. After the first-stage expansion head 4 of the tubing string encounters resistance in the deformed section of the casing, it is pressed down to determine the working load.

[0042] 3) Shaping: Lift the tubing string, slide the drill string, and engage the impactor to push the first-stage expansion head 4 downwards to expand and shape the deformed section of the casing. Throughout the process, the expansion head is at its maximum diameter. After shaping, observe the change in the weight indicator. Lift the tubing string again; the central shaft 5, lower coupling 2, and guide head 1 move upwards. The expansion head 4 separates from the outer conical surface of the central shaft 5 under the casing's rebound resistance. The spring 3 compresses under the upward force of the guide head 1. Subsequently, the expansion head 4 contracts under the internal pressure of the casing, thus smoothly removing the tubing string. Simultaneously, the reset spring 3 pushes the expansion head 4 upwards axially. Repeat the above steps to ensure that the first-stage expansion head 4 passes smoothly without obstruction.

[0043] 4) Graded plastic surgery: Following the steps in step 3), repeat the second-level 8, third-level 9, and so on plastic surgery until the requirements are met;

[0044] 5) Pulling out the tubing: Lift the tubing to remove the multi-stage anti-jamming shaping tubing and related tools.

[0045] In this invention, the multi-stage anti-jamming shaping string is combined with a multi-stage anti-jamming shaping device, allowing the shaping string to be lowered into the multi-stage anti-jamming shaping device at one time, realizing single-trip shaping of multiple points and sections of the casing downhole, thus improving operational efficiency. Regarding the anti-jamming design of the device, a certain number of slots are opened on the arc surface of the expansion head, allowing the expansion head to retract smoothly after encountering jamming, avoiding stuck drill accidents, and resetting under the action of a spring, enabling repeated shaping operations and improving shaping efficiency. Simultaneously, the elliptical arc surface design of the expansion head, compared to a conical design, results in lower frictional resistance and greater shaping and resetting force under the same construction load conditions, improving the shaping effect.

Claims

1. A type of anti-jamming shaping tubing, characterized in that, The device includes a multi-stage anti-jamming shaping device connected end-to-end by connecting pipes. The anti-jamming shaping device comprises a central pipe and an anti-jamming expansion head fitted over the central pipe. The central pipe has an upper connecting end for connecting to a higher-level connecting pipe and a lower connecting end for connecting to a variable-thread connector. An outer conical surface, wider at the top and narrower at the bottom, is formed between the upper and lower connecting ends, forming a straight pipe section between the outer conical surface and the lower connecting end. The lower end of the variable-thread connector is used to connect to a guide head at the bottom of a lower-level connecting pipe or shaping pipe column. The lower surface of the guide head is an arc surface for guidance. The anti-jamming expansion head includes an expansion shaping part for expanding and shaping the casing and a base connecting the expansion shaping part. The outer surface of the expansion shaping part is an elliptical arc surface, and the inner surface is an inner conical surface that contacts and mates with the outer conical surface. The expansion shaping part has an axially oriented slit for expansion. The diameter of the expansion and shaping part can be varied by extending to the base; the base is slidably sleeved on the straight pipe section; the anti-jamming shaping device also includes a spring sleeved on the straight pipe section of the central pipe, used to generate a force on the anti-jamming expansion head to move towards the outer conical surface, with the two ends of the spring contacting the end faces of the anti-jamming expansion head and the variable thread joint respectively; during the lowering of the shaping tube column, the expansion and shaping part is opened by the action of the outer conical surface on the inner surface of the expansion and shaping part; the central pipe, connecting pipe and variable thread joint are provided with interconnected through holes along the axial direction, the through hole of the variable thread joint for connecting the guide head is connected to the cavity of the guide head, and the arc surface of the lower surface of the guide head is provided with a vent hole connecting the cavity; corresponding to different wall thicknesses of the sleeve, the anti-jamming expansion head of the multi-stage anti-jamming shaping device has different combination level differences, the thicker the wall thickness, the smaller the combination level difference.

2. The anti-jamming shaping tubing string according to claim 1, characterized in that, For thick-walled bushings, select anti-jamming expansion heads with a combination grade difference of 2mm; for medium-thickness bushings, select anti-jamming expansion heads with a combination grade difference of 3mm; for thin-walled bushings, select anti-jamming expansion heads with a combination grade difference of 4mm.

3. The anti-jamming shaping tubing string according to claim 2, characterized in that, Thick-walled sleeves are 10.54mm thick, medium-thickness sleeves are 9.17mm thick, and thin-walled sleeves are 7.72mm thick.

4. The anti-jamming shaping tubing string according to claim 1, characterized in that, The ratio of the major axis to the minor axis of the elliptical arc surface is 1:2.

5.

5. The anti-jamming shaping tubing string according to claim 1, characterized in that, The outer conical surface is formed at the lower part of the upper connecting end.

6. The anti-jamming shaping tubing string according to claim 1, characterized in that, The lower end of the connecting pipe is threaded to the upper connecting end of the central pipe, and the upper end of the connecting pipe is connected to the lower connecting end of the adjacent anti-jamming shaping device through a variable thread connector.

7. The anti-jamming shaping tubing string according to claim 1, characterized in that, The spring is a compression spring, which is located between the annular groove on the upper end face of the variable snap joint and the annular groove on the lower end face of the base of the anti-jamming expansion head.

8. The anti-jamming shaping tubing string according to claim 1, characterized in that, The multi-stage anti-jamming shaping tubing is lowered into the casing. After the first-stage expansion head of the tubing encounters resistance in the deformed section of the casing, it is pressed down to determine the working load.

9. The anti-jamming shaping tubing string according to claim 1, characterized in that, The drain holes are evenly distributed.

10. The anti-jamming shaping tubing string according to claim 1, characterized in that, The axis of the drain hole is at a certain angle to the central axis of the guide head.

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