Anti-clamping shaping tubular column

Abstract

The invention relates to an anti-clamping shaping pipe column, and belongs to the technical field of damaged casing pipe repairing in petroleum engineering. Comprising a plurality of anti-clamping shaping devices connected end to end, and each anti-clamping shaping device comprises a center pipe and an anti-clamping expansion head arranged outside the center pipe in a sleeving mode; the upper end of the central pipe is provided with an upper connecting end for connecting an upper-stage pipe column, the lower end of the central pipe is provided with a lower connecting end for connecting a lower-stage pipe column, an outer conical surface with a thick upper part and a thin lower part is formed between the upper connecting end and the lower connecting end, and a straight pipe section is formed between the outer conical surface and the lower connecting end; the anti-clamping expansion head comprises an expansion shaping part used for expanding and shaping a casing pipe and a base part connected with the expansion shaping part, and a notch used for expanding is formed in the expansion shaping part in the axial direction. The straight pipe section is sleeved with the base part in a sliding mode, and the diameter of the expansion shaping part is changed through the action of the outer conical surface on the inner surface of the expansion shaping part. When the tubular column with the structure is used for casing pipe shaping, the problem that the shaping tubular column is clamped due to the rebound of the casing pipe can be solved, and meanwhile, the casing pipe shaping efficiency is improved.

Description

Technical Field

[0001] The invention relates to an anti-sticking shaping pipe column, belonging to the technical field of damaged casing repair in petroleum engineering. Background Art

[0002] With the increase of years of oil field development and the influence of multiple geological and engineering factors, many oil and water wells have casing deformation problems during the oil field production process, resulting in oil and water wells producing with defects or lying idle, process measures cannot be implemented, oil and gas production decreases, recovery rate decreases, and benefits decline.

[0003] During the impact shaping process, it is necessary to first print the casing reduction data. For working conditions with large casing deformation, it is necessary to replace the shapers of different step sizes in multiple trips according to the inner diameter of the casing deformation section to repair the casing step by step until the engineering requirements are met. This type of shaping requires multiple trips of the tubing string, which greatly increases the operation cycle, the overall well repair efficiency is low, and the risk of the shaping tubing string getting stuck is high. The authorization announcement text of the Chinese utility model patent authorization announcement with the authorization announcement number CN205172499U discloses an impact multi-stage shaping device. The body and the expansion section adopt an integrated structural design. The multi-stage expansion section increases step by step from bottom to top. A single tubing string can expand the inner diameter of the deformed casing in multiple stages, thereby improving the shaping efficiency. However, there are some disadvantages in the use of this device. The casing deformation section will rebound during the shaping process, which is easy to cause the shaper to get stuck, especially the multi-stage expansion tube, which has a greater risk of getting stuck, which may complicate the operating conditions of the accident well, and the device cannot be disassembled and assembled, and its practicality is limited. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-stuck shaping pipe column, which is used to solve the problem that the shaper is easily stuck when the casing is repaired in the prior art.

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

[0006] An anti-stuck shaping pipe column of the present invention comprises a plurality of anti-stuck shaping devices connected end to end, wherein the anti-stuck shaping devices comprise a central tube and an anti-stuck expansion head arranged outside the central tube; the upper end of the central tube comprises an upper connecting end for connecting to an upper-level pipe column, and the lower end comprises a lower connecting end for connecting to a lower-level pipe column, an outer cone surface which is thick at the top and thin at the bottom is formed between the upper connecting end and the lower connecting end, and a straight pipe section is formed between the outer cone surface and the lower connecting end; the anti-stuck expansion head comprises an expansion shaping part for expanding and shaping the casing and a base connected to the expansion shaping part, wherein an incision for expansion is opened along the axial direction; the base is slidably sleeved on the straight pipe section, and the change in the diameter of the expansion shaping part is achieved by the action of the outer cone surface on the inner surface of the expansion shaping part.

[0007] The beneficial effects of the above technical solution are as follows: the present invention slides an anti-expansion head outside the center tube, and in the process of lowering the shaping pipe column, the anti-expansion head with the cutout is opened through the conical surface on the center tube to achieve casing shaping; when the shaping pipe column is lifted up, when the casing rebound part is encountered, according to the interaction between the casing rebound part and the anti-expansion head, the anti-expansion head is moved away from the conical surface of the center tube, and the outer diameter of the anti-expansion head is reduced, which is more conducive to the rapid lifting of the pipe column. The present invention realizes the change of the outer diameter of the expansion shaping part through the action of the outer conical surface of the center tube on the inner surface of the expansion shaping part of the anti-expansion head, solves the problem of the shaping pipe column being stuck due to casing rebound in the prior art, and improves the casing shaping efficiency.

[0008] As a further improvement of the method, the anti-stuck shaping device also includes a spring sleeved on the straight pipe section of the central pipe, which is used to generate a force for the anti-stuck expansion head to move toward the outer conical surface.

[0009] The beneficial effect of the above technical solution is that a spring is sleeved on the straight section of the central pipe. When the casing is shaped, the spring acts on the anti-swelling head to expand on the conical surface of the central pipe, which facilitates casing shaping.

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

[0011] The beneficial effect of the above technical solution is that the expansion shaping part of the anti-stuck head can be expanded more smoothly through the inner and outer conical surfaces that cooperate with each other.

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

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

[0014] As a further improvement of the method, the anti-stuck shaping pipe column includes a multi-stage anti-stuck shaping device, and two adjacent anti-stuck shaping devices are connected by a connecting pipe and a variable buckle joint. The lower end of the connecting pipe is threadedly connected to the upper connecting end of the center pipe, and the upper end of the connecting pipe is connected to the lower connecting ends of adjacent anti-stuck shaping devices through a variable buckle joint.

[0015] The beneficial effects of the above technical solution are: connecting multiple anti-stuck shaping devices through connecting pipes and variable buckle joints to achieve multi-stage shaping of the anti-stuck devices, avoiding multiple tripping and lowering operations, and improving casing shaping efficiency. At the same time, connecting multiple anti-stuck shaping devices through connecting pipes and variable buckle joints that are threadedly connected to each other facilitates disassembly and assembly, thereby increasing the practicality of the device.

[0016] As a further improvement of the method, the spring is a compression spring, which is arranged between the annular groove on the upper end surface of the variable buckle joint and the annular groove on the lower end surface of the anti-stuck head base.

[0017] The beneficial effects of the above technical solution are: the position of the compression spring is fixed by the annular groove, the position of the compression spring is prevented from moving, and the reliability of the device is increased.

[0018] As a further improvement of the method, the anti-stuck device also includes a guide head, which is connected to the lowermost end of the shaping pipe column by a variable buckle joint, and its lower surface is a curved surface for guiding.

[0019] The beneficial effect of the above technical solution is that the guide head with an arc surface guide can guide the shaping device to quickly achieve shaping.

[0020] As a further improvement of the method, the center tube, the connecting tube and the variable buckle joint are provided with mutually connected through holes along the axial direction, the through hole of the variable buckle joint for connecting the guide head is connected with the cavity of the guide head, and the arc surface of the lower surface of the guide head is provided with a leakage hole connected to the cavity.

[0021] The beneficial effect of the above technical solution is that the central tube, the connecting tube and the variable buckle joint are provided with mutually connected through holes along the axial direction, and the guide head is provided with leakage holes connected with the through holes, so that the casing can be cleaned.

[0022] As a further improvement of the method, the axis of the leakage hole forms a certain angle with the central axis of the guide head.

[0023] The beneficial effect of the above technical solution is that the axis of the leakage hole forms a certain angle with the axial direction of the casing, which can form a reverse liquid flow in the annulus to achieve flushing. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 yes Figure 1 AA section diagram in;

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

[0027] Figure 4 It is a schematic diagram of the seeker of the present invention.

[0028] The markings in the figure are: 1. Guide head; 1-1. Drain hole; 2. Lower buckle joint; 3. Spring; 4. Anti-stuck head; 5. Center axis; 6. Connecting pipe; 7. Upper buckle joint; 8. Secondary shaping device; 9. Third-level shaping device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] The purpose of the present invention is to provide an anti-stuck shaping pipe string. By designing a multi-stage anti-stuck device combination, the shaping pipe string can be lowered into the multi-stage anti-stuck shaping device at one time, realizing single-trip shaping of multiple points and multiple stages of casing changes in the well, reducing the number of pipe string operations and reducing operating costs. At the same time, the device adopts an anti-stuck design, and the expansion head can be retracted after being stuck, so that it can be pulled out smoothly to avoid the occurrence of drill bit sticking accidents.

[0031] An anti-stuck shaping pipe string embodiment:

[0032] like Figure 1 As shown, the multi-stage anti-stuck shaping pipe column in this embodiment is composed of a guide head 1, a lower variable buckle joint 2, a spring 3, an anti-stuck expansion head 4, a central shaft 5, a connecting pipe 6, an upper variable buckle joint 7, a secondary shaping device 8, and a tertiary shaping device 9. The outer cone surface of the central shaft 5 is matched with the inner surface of the expansion head 3, the lower variable buckle joint 2 is connected with the outer thread of the end of the central shaft 5 through an internal thread, and the spring 3 and the two ends are respectively in contact with the anti-stuck expansion head 4 and the end surface of the variable buckle joint 2; the anti-stuck shaping device 8, 9 and other multi-stages are connected in series through a connecting pipe 6 and a variable buckle joint 7; the guide head 1 is placed at the lower end of the pipe column, and the upper part is threadedly connected with the variable buckle joint 2.

[0033] Specifically, Figure 1 and Figure 4 As shown, the outer surface of the guide head 1 is an arc surface, the interior is hollow, the upper end is provided with an internal thread, and the lower end surface is provided with evenly distributed leakage holes 1-1.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the anti-stuck head 4 has a hollow structure, the upper outer surface is an elliptical arc surface (the ratio of the major axis to the minor axis is 1:2.5), and the lower outer surface is a cylindrical surface, wherein, Figure 2 for Figure 1 Schematic diagram of the cross section of the anti-stuck expansion head in the middle anti-stuck shaping pipe column. The arc surface is opened with a certain number of through-hole grooves (also called: incisions), and the expansion joints of the grooves extend to the cylindrical surface, so that the diameter of the expansion head can be changed. The inner surface of the upper part of the expansion head is a conical surface, which contacts and cooperates with the outer surface of the main central axis. The front end surface of the expansion head is opened with an annular groove for placing the spring 3. The outer arc surface of the anti-stuck expansion head 4 has a variety of sizes.

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

[0036] like Figure 1As shown, both ends of the variable buckle joint 2 and the variable buckle joint 7 are provided with threads, and the whole is used for variable buckle 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 cylindrical hollow structure with threads at both ends.

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

[0039] The multi-stage anti-stuck shaping string in this embodiment is used to perform casing shaping, and the effect process and effect are as follows:

[0040] 1) Combination of multi-stage anti-stuck shaping device: according to the inner diameter size of the sleeve and engineering requirements, 5 1 For example, for thick-walled casing (10.54mm), it is difficult to shape, so choose the anti-sticking head 4 with a combined step difference of 2mm; for medium-walled casing (9.17mm), choose the anti-sticking head 4 with a combined step difference of 3mm; for thin-walled casing (7.72mm), it is easy to shape and has a small rebound, so choose the anti-sticking head 4 with a combined step difference of 4mm. According to the inner diameter size of the casing, select the first, second, third... anti-sticking devices in series until the diameter required by the project is passed, and the maximum shaping can be 2mm below the normal inner diameter of the casing.

[0041] 2) Lowering the pipe string: lower the multi-stage anti-stuck shaping pipe string into the casing. After the first-stage expansion head 4 of the pipe string encounters resistance in the deformation section of the casing, press down to determine the operating load;

[0042] 3) Shaping: lift the pipe column, slide the drill, and start the hammer to push the first-level expansion head 4 downward to expand and shape the deformed section of the casing. The expansion head is in the maximum diameter state during the whole process. After the shaping is completed, observe the changes in the weight indicator, lift the pipe column, and move the center axis 5, the lower buckle joint 2, and the guide head 1 upward. The expansion head 4 separates from the outer cone surface of the center axis 5 under the rebound resistance of the casing, and the spring 3 is compressed under the upward force of the guide head 1. Subsequently, the expansion head 4 contracts under the internal pressure of the casing to smoothly pull out the pipe column. At the same time, the reset spring 3 pushes the expansion head 4 to reset axially upward. Repeat the above steps to ensure that the first-level expansion head 4 passes smoothly without obstruction;

[0043] 4) Gradual shaping: According to step 3), repeat the second level 8, third level 9, etc. shaping until the requirements are met;

[0044] 5) Lifting the pipe string: Lift the pipe string, and remove the multi-stage anti-stuck shaping pipe string and supporting tools.

[0045] In the present invention, the multi-stage anti-stuck shaping pipe string is combined with a multi-stage anti-stuck shaping device, so that the shaping pipe string can be lowered into the multi-stage anti-stuck shaping device at one time, so as to realize single-trip shaping of multi-point and multi-stage casing changes in the well, thereby improving the working efficiency; for the anti-stuck design of the device, a certain number of empty grooves are opened on the arc surface of the expansion head, so that the expansion head can shrink after being stuck and be smoothly pulled out to avoid the occurrence of drill sticking accidents, and reset under the action of the spring to realize repeated shaping construction and improve the shaping efficiency; at the same time, the elliptical arc surface design of the expansion head, compared with the conical surface design, has small friction resistance and large shaping reset force under the same construction load conditions, thereby improving the shaping effect.

Claims

1. An anti-stuck shaping pipe string, characterized in that: It comprises a plurality of anti-stuck shaping devices connected end to end, the anti-stuck shaping device comprises a central tube and an anti-stuck expansion head arranged outside the central tube; the upper end of the central tube comprises an upper connecting end for connecting an upper pipe column, the lower end comprises a lower connecting end for connecting a lower pipe column, an outer cone surface which is thick at the top and thin at the bottom is formed between the upper connecting end and the lower connecting end, and a straight pipe section is formed between the outer cone surface and the lower connecting end; the anti-stuck expansion head comprises an expansion shaping part for expanding the casing and a base connected to the expansion shaping part, the expansion shaping part is provided with a cut for expansion along the axial direction; the base is slidably sleeved on the straight pipe section, and the diameter of the expansion shaping part is changed by the action of the outer cone surface on the inner surface of the expansion shaping part.

2. The anti-stuck shaping pipe column according to claim 1, characterized in that: The anti-stuck shaping device also includes a spring which is sleeved on the straight pipe section of the central pipe and is used to generate a force for the anti-stuck expansion head to move toward the outer conical surface.

3. The anti-stuck shaping pipe column according to claim 2, characterized in that: The inner surface of the expansion shaping portion is an inner conical surface that contacts and cooperates with the outer conical surface.

4. The anti-stuck shaping pipe column according to claim 2, characterized in that: The outer surface of the expansion and shaping portion is an elliptical arc surface.

5. The anti-stuck shaping pipe column according to claim 2, characterized in that: The outer conical surface is formed at the lower part of the upper connecting end.

6. The anti-stuck shaping pipe column according to claim 2, characterized in that: The anti-stuck shaping pipe column includes a multi-stage anti-stuck shaping device, two adjacent anti-stuck shaping devices are connected by a connecting pipe and a variable buckle joint, the lower end of the connecting pipe is threadedly connected to the upper connecting end of the central pipe, and the upper end of the connecting pipe is connected to the lower connecting ends of adjacent anti-stuck shaping devices through a variable buckle joint.

7. The anti-sticking shaping pipe column according to claim 6, characterized in that: The spring is a compression spring, which is arranged between the annular groove on the upper end surface of the variable buckle joint and the annular groove on the lower end surface of the anti-stuck head base.

8. The anti-sticking shaping pipe column according to claim 6, characterized in that: The anti-stuck device also includes a guide head, which is connected to the lowermost end of the shaping pipe column by a variable buckle joint, and the lower surface of the guide head is a curved surface for guiding.

9. The anti-stuck shaping pipe column according to claim 8, characterized in that: The central tube, the connecting tube and the variable buckle joint are provided with mutually connected through holes along the axial direction, the through hole of the variable buckle joint for connecting the guide head is connected with the cavity of the guide head, and the arc surface of the lower surface of the guide head is provided with a leakage hole connected with the cavity.

10. The anti-sticking shaping pipe column according to claim 9, characterized in that: The axis of the leakage hole forms a certain angle with the central axis of the guide head.

Images