Erosion control circular ring loading device for corrosion prevention of casing perforation hole

Abstract

The invention discloses an erosion control circular ring loading device for corrosion prevention of casing perforation eyelets. The erosion control circular ring loading device comprises a perforating gun, a plurality of eyelets are formed in the outer wall of the perforating gun, an energy-gathered perforating bullet is arranged in each eyelet, an erosion control circular ring is arranged in each energy-gathered perforating bullet, and a perforation cable is arranged in the perforating gun. A layer of protection ring can be formed for a casing perforation hole, then the casing perforation hole is protected, the on-site requirement of an oil field can be met, the full-bore cylindrical structure does not affect other operation processes, operation is easy, and cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic fracturing in oil and gas field development, and in particular relates to an erosion control ring loading device for corrosion prevention of casing perforation holes. Background Art

[0002] Nowadays, domestic shale oil resources are very rich, with huge development and utilization potential and broad prospects. The transition from conventional oil and gas to unconventional oil and gas in the field of oil and gas exploration and development is an inevitable trend in the development of the oil industry. Drawing on foreign experience, vigorously developing China's shale oil has become an inevitable strategic choice and the only way. Large-scale sand fracturing is a necessary means for the efficient development of unconventional oil and gas.

[0003] Oilfields at home and abroad have incorporated large-scale volumetric sand fracturing into the main technology for oilfield development. In view of the dense reservoir characteristics, Changqing Oilfield has developed a volumetric fracturing technology with "dense cutting fracturing + high-intensity sand addition + extreme fluid control and sand addition" as the core. The segment spacing is reduced and the number of clusters is increased through the dense seam transformation mode. The high-intensity sand addition design improves the sand addition intensity. At the same time, the extreme flow-limiting fracturing technology is used to reduce the number of perforations or reduce the perforation aperture to balance the extension differences of each cluster of fractures, so as to achieve balanced fracturing of multiple clusters of fractures in the segment. However, large-scale volumetric sand addition fracturing operations are characterized by large displacement, high sand content ratio, high pump pressure, long time and large scale. These conditions restrict the safe and efficient development of unconventional oil and gas, and also bring huge challenges to the erosion and wear protection of casing perforations.

[0004] Foreign researchers monitored it through downhole imaging technology and found that fracturing construction had a serious effect on the erosion and expansion of the perforation holes. And when implementing extreme flow restriction, the hole erosion phenomenon will change the friction and pressure drop from the wellbore to the formation, reduce its flow restriction effect and ultimately lead to non-uniform extension of the cracks, affecting the fracturing transformation effect. Therefore, it is necessary to rely on technical means to avoid casing hole erosion, increase oil and gas production, and improve economic benefits. Summary of the invention

[0005] The purpose of the invention is to provide an erosion control ring loading device for corrosion prevention of casing perforation holes, so as to solve the problem that casing holes are easily eroded.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an erosion control ring loading device for corrosion protection of casing perforation holes, including a perforating gun, a plurality of holes are arranged on the outer wall of the perforating gun, a shaped energy perforating charge is arranged in each of the holes, an erosion control ring is arranged in the shaped energy perforating charge, and a perforating cable is arranged in the perforating gun.

[0007] As a preferred technical solution of the present invention, the holes are arranged in a spiral shape on the outer wall of the perforating gun.

[0008] As a preferred technical solution of the present invention, the shaped charge perforator includes a shell, a powder cover is arranged in the shell, high-energy explosives are filled between the powder cover and the shell, a detonating cord is arranged on the shell, and an erosion control ring sleeve is arranged on the powder cover.

[0009] As a preferred technical solution of the present invention, the metal medicine powder cover is a conical structure.

[0010] As a preferred technical solution of the present invention, the shell is a metal shell.

[0011] As a preferred technical solution of the present invention, the medicine powder cover is a metal medicine powder cover.

[0012] As a preferred technical solution of the present invention, the erosion control ring includes a strong magnetic element, a tube wall fitting portion is arranged on the outside of the strong magnetic element, and a hole surrounding portion is arranged on the inside of the strong magnetic element.

[0013] The beneficial effects of the present invention are as follows: the erosion control ring loading device for anti-corrosion of the casing perforation hole of the present invention can form a protective ring for the casing perforation hole, thereby protecting the casing perforation hole, which not only meets the on-site needs of the oil field, but also has a full-diameter cylindrical structure that does not affect other operation processes, is simple to operate, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the erosion control ring loading device for corrosion prevention of casing perforation holes of the present invention;

[0015] Figure 2 It is a schematic diagram of a shaped charge perforating charge in a device for loading an erosion control ring for corrosion prevention of casing perforation holes according to the present invention;

[0016] Figure 3 This is an overall effect diagram of avoiding hole erosion during post-pressing production in the practical application of the present invention;

[0017] Figure 4 It is a schematic diagram of an erosion control ring in an erosion control ring loading device for casing perforation hole corrosion prevention of the present invention;

[0018] Figure 5 It is the controlled erosion ring D in the practical application of the present invention. 孔眼围绕部 =D 套管射孔孔眼 The effect of the new type of erosion control ring hole around the end inserted into the casing perforation hole;

[0019] Figure 6 It is the controlled erosion ring D in the practical application of the present invention. 孔眼围绕部 =D 套管射孔孔眼 -(1mm~4mm) effect diagram of the new type of erosion control ring hole around the end inserted into the casing perforation hole;

[0020] In the figure: 1. perforating cable; 2. shaped charge perforating bullet; 3. perforating gun; 4. detonating cord; 5. erosion control ring; 6. outer shell; 7. powder cover; 8. high-energy explosive; 9. strong magnetic element; 10. pipe wall fitting part; 11. hole surrounding part; 12. casing wall; 13. cement ring; 14. formation perforation hole; 15. formation; 16. casing perforation hole. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings, tables and specific embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The present invention is further described below by way of examples, but is not limited to the following embodiments.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown, the erosion control ring loading device for corrosion prevention of casing perforation holes of the present invention comprises a perforating gun 3, a plurality of holes are arranged on the outer wall of the perforating gun 3, a shaped energy perforating bullet 2 is arranged in each hole, an erosion control ring 5 is arranged in the shaped energy perforating bullet 2, and a perforating cable 1 is arranged in the perforating gun 3.

[0025] The perforating gun 3 is lowered into the target layer through the perforating cable 1, and the new shaped energy perforating bullet 2 is detonated on the ground by the electric ignition principle to generate a high-temperature, high-pressure, high-speed moving metal jet.

[0026] like Figure 2 and Figure 3 As shown, the shaped charge 2 includes a detonating cord 4, a shell 6, a powder cap 7 and a high-energy explosive 8. The detonating cord 4 is connected to the upper part of the shell 6, and the erosion control ring 5 is placed between the metal cap 7 and the high-energy explosive 8. The new shaped charge 2 is detonated by the detonating cord 4, and the powder cap 7 produces a shaped energy effect. Driven by the detonation products of the high-energy explosive 8, the powder cap 7 is quickly crushed and forms a high-speed metal jet, which penetrates the casing wall 12 and the cementing cement ring 13, forms a casing perforation hole 16 in the casing wall 12, and realizes a deep and elongated formation hole 14 in the formation 15.

[0027] When working, please follow the following steps:

[0028] Step 1, determine the perforation process of the reformed well, and determine the diameter of the casing perforation hole 16 after perforation and before fracturing under the perforation process, and the number of shaped perforating charges 2 with erosion control rings 5 ​​required according to downhole photography or statistical data obtained in the early stage;

[0029] Step 2, according to the diameters of the casing perforation holes 16 after perforation and before fracturing, shaped perforating charges 2 with erosion control rings 5 ​​of different sizes are placed in multiple holes distributed on the surface of the perforating gun 3.

[0030] Step 3, the perforating gun 3 is lowered into the target layer through the perforating cable 1, and ignites and perforates. The high-energy explosive 8 in the shaped charge perforating bullet 2 will produce an explosive explosion effect, generate a large amount of heat, a large amount of gas, and move at high speed. The powder cover 7 generates a high-temperature, high-pressure, high-speed moving metal jet through the shaped charge effect, and penetrates the casing wall 12 and the cement ring 13, forming a casing perforation hole 16 on the casing wall 12, and realizing a deeper and elongated formation hole 14 in the formation 15. At this time, the erosion control ring 5 is adsorbed in the casing perforation hole 16 under the impact force;

[0031] Step 4: lift the perforating gun 3 to complete the perforating work of this section, carry out subsequent sealing and fracturing construction work, and prepare for the next perforating work.

[0032] Example 2

[0033] like Figure 4 As shown, different from Example 1, in the erosion control ring loading device for casing perforation hole corrosion prevention of the present invention, the erosion control ring 5 includes a strong magnetic element 9, a pipe wall fitting portion 10, and a hole surrounding portion 11. The erosion control ring 5 flies out of the perforating gun 3 under a large amount of heat, a large amount of gas and a high-speed impact force. By utilizing the super strong adsorption of the strong magnetic element 9, the pipe wall fitting end 10 of the erosion control ring 5 is tightly adsorbed on the casing wall 12, and the hole surrounding end 11 of the erosion control ring 5 is inserted into the casing perforation hole 16, forming a protective ring for the casing perforation hole 16, thereby protecting the casing perforation hole 16, avoiding the erosion and wear of the fracturing fluid and sand addition during the subsequent fracturing construction, and the crack extension is more uniform, thereby improving the fracturing transformation effect.

[0034] like Figure 5 As shown, when the D of the erosion ring 5 is controlled 孔眼围绕部 =D 套管射孔孔眼 When the casing is eroded, the pipe wall fitting portion 10 is firstly tightly adsorbed onto the casing wall 12 by utilizing the super strong adsorption of the strong magnetic element 9. At this time, the hole surrounding portion 11 of the erosion control ring 5 is inserted into the casing perforation hole 16 and is completely fitted with the casing perforation hole 16, forming a protective ring for the casing perforation hole 16, thereby protecting the casing perforation hole 16.

[0035] like Figure 6 As shown, when the D of the erosion ring 5 is controlled 孔眼围绕部 =D 套管射孔孔眼-(1mm~4mm), firstly, the strong adsorption of the strong magnetic element 9 is used to tightly adsorb the part of the pipe wall fitting portion 10 whose area is larger than the casing perforation hole 16 onto the casing wall 12. At this time, the hole surrounding portion 11 of the erosion control ring 5 is inserted into the casing perforation hole 16, but is not completely fitted with the casing perforation hole 16. A protective ring is formed on the inner side of the casing perforation hole 16. The liquid and solid in the subsequent fracturing construction will not cause erosion and wear to the casing perforation hole 16, thereby protecting the casing perforation hole 16.

[0036] Example 3

[0037] like Figure 1 As shown, different from Example 1, in the erosion control ring loading device for casing perforation hole corrosion prevention of the present invention, the holes are spirally arranged on the outer wall of the perforating gun 3, so that more shaped charge perforating bullets 2 can be easily arranged on the perforating gun 3, and the balance is better.

[0038] Example 4

[0039] like Figure 3 As shown, different from Example 1, in the device for loading the erosion control ring for corrosion protection of the casing perforation hole of the present invention, the powder cover 7 is a conical structure, which is convenient for installing the erosion control ring 5.

[0040] Therefore, compared with the prior art, the erosion control ring loading device for anti-corrosion of the casing perforation hole of the present invention can form a protective ring for the casing perforation hole, thereby protecting the casing perforation hole, which not only meets the on-site needs of the oil field, but also its full-diameter cylindrical structure does not affect other operation processes, is simple to operate and has low cost.

[0041] The above description shows and describes several preferred embodiments of the invention, but as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and modifications made by those skilled in the art should be within the scope of protection of the claims attached to the invention without departing from the spirit and scope of the invention.

Claims

1. An erosion control ring loading device for casing perforation hole corrosion prevention, characterized in that: The invention comprises a perforating gun (3), wherein a plurality of holes are arranged on the outer wall of the perforating gun (3), a shaped perforating charge (2) is arranged in each hole, an erosion control ring (5) is arranged in the shaped perforating charge (2), and a perforating cable (1) is arranged in the perforating gun (3).

2. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 1 is characterized in that: The holes are arranged in a spiral shape on the outer wall of the perforating gun (3).

3. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 2 is characterized in that: The shaped charge perforating bullet (5) comprises an outer shell (6), a powder cover (7) is arranged inside the outer shell (6), a high-energy explosive (8) is filled between the powder cover (7) and the outer shell (6), a detonating cord (4) is arranged on the outer shell (6), and an erosion control ring (5) is sleeved on the powder cover (7).

4. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 3 is characterized in that: The medicine-type powder cover (7) is a conical structure.

5. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 4 is characterized in that: The shell (6) is a metal shell.

6. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 5 is characterized in that: The medicine-type powder cover (7) is a metal medicine-type powder cover.

7. The erosion control ring loading device for casing perforation hole corrosion prevention according to claim 6 is characterized in that: The erosion control ring (5) comprises a strong magnetic element (9), a tube wall fitting portion (10) is arranged outside the strong magnetic element (9), and a hole surrounding portion (11) is arranged inside the strong magnetic element (9).

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