High-pressure water jet sand blasting perforation simulation test device

Abstract

A high-pressure water jet sand blasting perforation simulation test device relates to the field of test equipment of oil field downhole tools and downhole processes and comprises a simulation shaft and a target piece, the simulation shaft is vertically arranged, a mounting cylinder is fixed on the side face of the simulation shaft, and the axis of the mounting cylinder is perpendicular to the axis of the simulation shaft; and the target piece is mounted in the mounting cylinder. The installation cylinders are arranged in pairs, the two installation cylinders in each group are connected through bolts, the simulation wellbore is clamped between the two installation cylinders, and therefore the two installation cylinders are fixed to the outer wall of the simulation wellbore. And the tail end of the mounting cylinder is connected with the plug, and after the plug is detached, the target piece can be loaded or taken out, so that the target piece is convenient to disassemble, assemble and replace. According to the simulation test device, the installation cylinder is arranged outside the simulation wellbore, and the target piece is filled in the installation cylinder, so that the underground environment during sand blasting perforation operation can be effectively simulated, and compared with the prior art, the simulation test device is simpler in structure.

Description

Technical Field

[0001] The utility model belongs to the field of test equipment for downhole tools and downhole processes in oil fields, in particular to a high-pressure water jet sandblasting and perforation simulation test device. Background Art

[0002] Sandblasting is a perforating process that utilizes a high-speed water jet mixed with sand particles, delivered by a jetting tool, to penetrate the casing and the surrounding formation from within the casing, creating perforations. Perforating can cause irreversible damage to both the casing and the formation. Therefore, to ensure a successful first-time perforation, the performance of the jetting tool itself and various process parameters must be tested and verified.

[0003] At present, in order to simulate the downhole environment during sandblasting perforation simulation tests, a simulation test device is usually made by setting a casing with the same diameter as that in the oil well on the ground and setting a cement ring outside the casing to simulate the formation. However, this simulation test device has the disadvantages of being bulky, difficult to visually observe and sample the perforation effect, and low test efficiency, which needs to be improved. Utility Model Content

[0004] The utility model provides a high-pressure water jet sandblasting perforation simulation test device, which aims to improve the problems of existing simulation test devices such as bulky structure, difficulty in visually observing and sampling perforation effects, and low test efficiency.

[0005] The technical problem solved by the present invention is achieved by the following technical solution: The present invention provides a high-pressure water jet sandblasting perforation simulation test device, including a simulated wellbore and a target.

[0006] The simulated wellbore is arranged vertically, and a mounting tube is fixed on the side of the simulated wellbore, and the axis of the mounting tube is perpendicular to the axis of the simulated wellbore;

[0007] The target is installed in the installation tube.

[0008] As a preferred solution, the mounting tubes are arranged in groups of two, and the two mounting tubes in each group are connected by bolts, and the simulated wellbore is clamped therebetween, thereby fixing the two mounting tubes on the outer wall of the simulated wellbore.

[0009] As a preferred solution, a plug is connected to the end of the installation tube. After the plug is removed, the target can be loaded or removed, which facilitates the disassembly, assembly and replacement of the target.

[0010] As a preferred solution, a wellhead is provided at the upper end of the simulated wellbore;

[0011] The lower end of the simulated wellbore is also sealed by a plug.

[0012] As a preferred solution, a well plug is installed on the wellhead.

[0013] As a preferred solution, the simulated wellbore is installed on a supporting structure, and the simulated wellbore is maintained in a vertical state under the support of the supporting structure.

[0014] As a preferred solution, the support structure includes a base, a gantry and an operating platform, the lower end of the gantry is fixedly connected to the base, the operating platform is connected to the gantry and located above the base, and the simulated wellbore is fixedly mounted on the operating platform.

[0015] As a preferred solution, an electric winch is provided on the top of the support structure, and the electric winch is located directly above the simulated wellbore.

[0016] As a preferred embodiment, the side of the simulated wellbore is processed with a through hole corresponding to the target piece. Correspondingly, the target piece is provided with an arc-shaped plate for sealing the through hole on the simulated wellbore, and the wall thickness and curvature radius of the inner and outer surfaces of the arc-shaped plate are the same as those of the simulated wellbore.

[0017] As a preferred solution, the base is a trough-shaped structure, which can be used to collect liquid discharged during the test.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model can effectively simulate the downhole environment during sandblasting and perforating operations by arranging a mounting tube outside the simulated wellbore and filling the mounting tube with target pieces. Compared with the existing technology, the structure of the simulation test device is simpler.

[0020] 2. In the present invention, the target can be quickly replaced, thereby greatly improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 2 It is a schematic diagram of the assembly structure of the simulated wellbore, installation tube, wellhead and well plug.

[0023] Figure 3 yes Figure 2 Cross-sectional view at point A.

[0024] Figure 4 It is a structural schematic diagram of another embodiment of a simulated wellbore and target.

[0025] Figure 5 yes Figure 4 Cross-sectional view at point B.

[0026] Figure 6 yes Figure 4 and Figure 5Schematic diagram of the target structure used in the experiment.

[0027] Figure 1 In the figure: 1. Base; 2. Gantry; 3. Plug; 4. Simulated wellbore; 5. Mounting tube; 6. Operating platform; 7. Wellhead; 8. Well plug; 9. Electric winch; 10. Target; 11. Curved plate; 12. Steel jacket; 13. Cement filler. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] First embodiment

[0030] like Figure 1-3 As shown, this embodiment includes a simulated wellbore 4 and a target 10. The simulated wellbore 4 has parameters such as inner diameter, wall thickness, and steel grade consistent with downhole casing, allowing for accurate simulation of the casing. The target 10 is made of cement, allowing it to accurately simulate the formation outside the downhole casing.

[0031] like Figure 1 As shown in FIG2 , the simulated wellbore 4 is vertically arranged, and a mounting tube 5 is fixed on the side of the simulated wellbore 4 . The axis of the mounting tube 5 is perpendicular to the axis of the simulated wellbore 4 , and the target 10 is installed in the mounting tube 5 .

[0032] Working principle:

[0033] The utility model can simulate the above-ground and underground production environments of oil and water wells in oil fields, and provide simulated formations and simulated process environments for the research and development of high-pressure water jet sandblasting perforation and oil field production increase related technologies, thereby quickly verifying and optimizing process parameters, verifying the functions and reliability of downhole tools, and thus accelerating the research and development process of related technologies.

[0034] During use, the perforating tool is lowered into the simulated wellbore 4, with the jet holes on the tool aligned with the target 10. The tool is then connected to a pump truck, which pumps perforating fluid mixed with sand into the tool. The fluid is then ejected at high speed from the jet holes on the tool. The continuous high-speed jet penetrates the sidewall of the simulated wellbore 4 and then creates a hole in the target 10.

[0035] During implementation, the composition of the target 10 can be adjusted according to the hardness and permeability of the formation to produce a target 10 close to the formation parameters, thereby simulating a more realistic downhole environment.

[0036] like Figure 1 、 2 As shown in Figure 3, in this embodiment, the mounting tubes 5 are arranged in groups of two, and the two mounting tubes 5 in each group are connected by bolts, and the simulated wellbore 4 is clamped therebetween, thereby fixing the two mounting tubes 5 on the outer wall of the simulated wellbore 4.

[0037] like Figure 1 、 2 As shown in FIG3 , in this embodiment, a plug 3 is connected to the end of the mounting tube 5. After removing the plug 3, the target 10 can be installed or removed, facilitating installation, disassembly, and replacement of the target 10. Removing the target 10 allows the perforation depth to be measured and the dimensions of the perforation channel to be observed. Replacing the target 10 allows immediate preparation for the next test.

[0038] like Figure 1 As shown in Figure 2, in this embodiment, a wellhead 7 is provided at the upper end of a simulated wellbore 4; the lower end of the simulated wellbore 4 is also sealed by a plug 3. A wellhead closure device 8 is installed on the wellhead 7. The wellhead 7 and wellhead closure device 8 simulate the structure of a real oil and water wellhead 7, allowing the present invention to be further applied to a wider range of downhole tool or process tests.

[0039] like Figure 1 As shown, the simulated wellbore 4 is mounted on a support structure, which supports the simulated wellbore 4 and maintains it in an upright position. In this embodiment, the support structure includes a base 1, a gantry 2, and an operating platform 6. The lower end of the gantry 2 is fixedly connected to the base 1. The operating platform 6 is connected to the gantry 2 and is located above the base 1. The simulated wellbore 4 is fixedly mounted on the operating platform 6.

[0040] like Figure 1 As shown, in this embodiment, an electric winch 9 is provided on the top of the support structure, and the electric winch 9 is located directly above the simulated wellbore 4. Through the lifting and hoisting functions of the electric winch 9, on the one hand, the test pipe string can be lifted and lowered; on the other hand, the operating platform 6 can be moved up and down as needed (the operating platform 6 needs to be re-fixed after movement, and the fixing method may be bolts, latches, etc.).

[0041] In this embodiment, the base 1 is a trough-shaped structure with an open top, which can be used to collect liquid discharged during the test process.

[0042] Second embodiment

[0043] like Figure 4-6 As shown, in this embodiment, the side of the simulated wellbore 4 is machined with a through hole corresponding to the target 10. Correspondingly, the target 10 is provided with a curved plate 11 for blocking the through hole on the simulated wellbore 4. The wall thickness and the curvature radius of the inner and outer surfaces of the curved plate 11 are the same as those of the simulated wellbore 4. The function of the curved plate 11 is to simulate the side wall of the simulated wellbore 4 in the first embodiment, and the advantages are:

[0044] In the first embodiment, after perforating once, a hole is machined on the simulated wellbore 4, and the simulated wellbore 4 may need to be replaced for the next test. In the present embodiment, a through hole is machined on the simulated wellbore 4, and an arc-shaped plate 11 is provided at the end of the target 10. The arc-shaped plate 11, as a part of the target 10, can be replaced together with the target 10 without having to replace the wellbore.

[0045] like Figure 6 As shown, in this embodiment, a steel sheath 12 is provided on the outside of the target 10, the end of the steel sheath 12 is connected to the arc plate 11, and a cement filler 13 is provided inside the steel sheath 12. With the support of the steel sheath 12, the position of the arc plate 11 is more stable.

Claims

1. A high-pressure water jet sandblasting perforation simulation test device, characterized in that: It includes a simulated wellbore (4) and a target (10), The simulated wellbore (4) is arranged vertically, and a mounting tube (5) is fixed on the side of the simulated wellbore (4), and the axis of the mounting tube (5) is perpendicular to the axis of the simulated wellbore (4); The target piece (10) is installed in the installation tube (5).

2. The high-pressure water jet sandblasting perforation simulation test device according to claim 1, characterized in that: The mounting tubes (5) are arranged in groups of two, and the two mounting tubes (5) in each group are connected by bolts, and the simulated wellbore (4) is clamped therebetween, thereby fixing the two mounting tubes (5) on the outer wall of the simulated wellbore (4).

3. The high-pressure water jet sandblasting perforation simulation test device according to claim 1, characterized in that: The end of the mounting tube (5) is connected to a plug (3). After the plug (3) is removed, the target (10) can be loaded or removed, making it easy to disassemble and replace the target (10).

4. The high-pressure water jet sandblasting perforation simulation test device according to claim 1, characterized in that: A wellhead (7) is provided at the upper end of the simulated wellbore (4); The lower end of the simulated wellbore (4) is also blocked by a plug (3).

5. The high-pressure water jet sandblasting perforation simulation test device according to claim 4, characterized in that: A well sealer (8) is installed on the wellhead (7).

6. A high-pressure water jet sandblasting perforation simulation test device according to any one of claims 1 to 5, characterized in that: The simulated wellbore (4) is installed on a supporting structure, and the simulated wellbore (4) is maintained in a vertical state under the support of the supporting structure.

7. The high-pressure water jet sandblasting perforation simulation test device according to claim 6, characterized in that: The support structure comprises a base (1), a gantry (2) and an operating platform (6); the lower end of the gantry (2) is fixedly connected to the base (1); the operating platform (6) is connected to the gantry (2) and is located above the base (1); and the simulated wellbore (4) is fixedly mounted on the operating platform (6).

8. The high-pressure water jet sandblasting perforation simulation test device according to claim 6, characterized in that: An electric winch (9) is provided on the top of the support structure, and the electric winch (9) is located directly above the simulated wellbore (4).

9. A high-pressure water jet sandblasting perforation simulation test device according to any one of claims 1-5, 7, and 8, characterized in that: A through hole corresponding to the target (10) is machined on the side of the simulated wellbore (4); correspondingly, an arc-shaped plate (11) for blocking the through hole on the simulated wellbore (4) is provided on the target (10), and the wall thickness and the curvature radius of the inner and outer surfaces of the arc-shaped plate (11) are the same as those of the simulated wellbore (4).

10. The high-pressure water jet sandblasting perforation simulation test device according to claim 7, characterized in that: The base (1) is a trough-shaped structure and can be used to collect liquid discharged during the test process.

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