Water injection and steam injection huff and puff collaborative oil production integrated pipe column and process method

Abstract

A water injection pipe column and a steam injection heat insulation pipe are installed in a casing pipe in parallel, a horn opening is formed in the bottom of the water injection pipe column, and an oil pipe centralizer is arranged between the water injection pipe column and the outer wall of the steam injection heat insulation pipe; a double-pipe packer is arranged among the inner wall of the casing pipe, the outer wall of the water injection tubular column and the outer wall of the steam injection heat insulation pipe, an eccentric packer is arranged between the outer wall of the steam injection heat insulation pipe and the inner wall of the casing pipe, the bottom of the steam injection heat insulation pipe is connected with a rod type pump seat, and a pen point is installed at the bottom of the rod type pump seat. A sucker rod is installed in the steam injection heat insulation pipe, the bottom of the sucker rod is connected with a rod pump, and the rod pump is installed on a rod pump base. Water injection is carried out on a thin oil layer, steam huff and puff is carried out on a thick oil layer, then rotary pumping production is carried out, the well spacing number is reduced, and the block oil extraction speed is increased. Meanwhile, the tubular column further has the functions of negative pressure oil extraction and strong oil pipe righting, liquid production of an oil well is improved, and oil pipe winding is prevented.

Description

Technical Field

[0001] The present invention relates to an integrated pipe string and process method for coordinated oil production by water injection and steam injection, in particular to an integrated pipe string and process method for coordinated oil production by water injection and steam injection for multiple oil reservoirs with large oil layer spans and large differences in crude oil viscosity, which require multiple different development methods. Background Art

[0002] For multiple oil reservoirs with large spans and large differences in crude oil viscosity that require multiple different development methods, the current main method is to develop the layers separately. Among them, the thin oil reservoir is mainly developed by water injection, and the heavy oil reservoir is mainly developed by steam stimulation. The two layers are exploited separately at different stages and cannot be used at the same time. Therefore, an integrated pipe column and process method for coordinated oil production with water injection and steam stimulation is designed. Water injection is implemented in the thin oil layer and steam stimulation is performed on the heavy oil layer before switching to production, so that two different development layers can be used simultaneously in one oil well, reducing the number of wells and increasing the oil production rate of the block.

[0003] After reviewing the article "Application of Integrated Injection and Production Tubing in Ultra-Heavy Oil Wells" published in "Oil and Gas·Petroleum and Natural Gas Science" in 2021, a steam injection and oil production integrated tubing process emerged. This tubing only shortens the operation time from steam injection to pumping of ultra-heavy oil, and reduces the cold damage to the oil layer caused by well washing operations, but still cannot solve problems such as the simultaneous development and utilization of thin oil and heavy oil formations.

[0004] After checking the CN201910044009.5 patent "A horizontal well water injection and oil production integrated tubing and process method", an integrated water injection and oil production tubing appeared, but the tubing only achieved general water injection and combined oil production, and is only suitable for light oil water injection development. It still cannot solve the problem of steam injection and throughput in heavy oil layers and the simultaneous development of light oil and heavy oil according to different development methods.

[0005] After checking the CN201520211846.X patent "A pipe string for an integrated oil production and water injection process", an integrated oil production and water injection process pipe string appeared, but the pipe string only combines the oil production pipe string and the water injection pipe string into one, and the pipe string is only suitable for thin oil water injection development, and still cannot solve the problem of steam injection and huff and puff of heavy oil layers and the simultaneous exploitation of thin oil and heavy oil according to different development methods. Summary of the invention

[0006] In order to solve the problem that multiple layers cannot be used simultaneously according to different development methods, the present invention designs an integrated pipe string and process method for coordinated oil production with water injection and steam injection, respectively injecting water into the thin oil layer and performing steam injection and then switching to production with heavy oil layer, so that two different development layers can be used simultaneously in one oil well, reducing the number of wells and increasing the oil production rate of the block.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: an integrated pipe string for coordinated oil production with water injection and steam injection, comprising a casing, in which a water injection pipe string and a steam injection insulation pipe are installed in parallel, a bell mouth is installed at the bottom of the water injection pipe string, an oil pipe straightener is provided between the water injection pipe string and the outer wall of the steam injection insulation pipe, a double-tube packer is provided between the inner wall of the casing, the outer wall of the water injection pipe string and the outer wall of the steam injection insulation pipe, an eccentric packer is provided between the outer wall of the steam injection insulation pipe and the inner wall of the casing, a rod pump seat is connected to the bottom of the steam injection insulation pipe, and a pen tip is installed at the bottom of the rod pump seat; a sucker rod is installed in the steam injection insulation pipe, the bottom of the sucker rod is connected to a rod pump, and the rod pump is installed on the rod pump seat.

[0008] Furthermore, the tubing centralizer and the double-tube packer are located above the water injection layer.

[0009] Further, the tubing centralizer is located above the double tubing packer.

[0010] Furthermore, the eccentric packer is located between the water injection layer and the oil production layer.

[0011] Further, the eccentric packer is located below the double-tube packer.

[0012] Furthermore, there are two tubing centralizers.

[0013] A water injection and steam injection huff and puff coordinated oil production process method, with an integrated pipe column, comprises the following steps:

[0014] A. The steam injection insulation pipe with eccentric packer and rod pump seat and the water injection string with double pipe packer are lowered into the predetermined position respectively, and the water injection string and steam injection insulation pipe are straightened by the tubing straightener;

[0015] B. The eccentric packer is used to isolate the thin oil layer and the heavy oil layer, and the double-tube packer is used to protect the casing;

[0016] C. Inject water into the thin oil layer through the water injection column;

[0017] D. Steam injection and huff-and-puff into the heavy oil layer through the steam injection insulation pipe;

[0018] E. After the steam injection is completed, the sucker rod assembly with the rod pump is lowered into the steam injection insulation pipe, and the well is opened for pumping production.

[0019] Furthermore, a sucker rod assembly with a rod pump is lowered into the steam injection insulation pipe, and the well is opened for production; due to the presence of the eccentric packer, when the sucker rod assembly with a rod pump pumps up and down, negative pressure is formed near the rod pump seat, thereby improving the fluid supply capacity of the oil-producing layer.

[0020] The present invention designs an integrated pipe string for coordinated oil production with water injection and steam injection, which can realize water injection for thin oil layers and steam injection for thick oil layers before switching to production, so that two sets of different development layers can be used at the same time in one oil well, reducing the number of wells and increasing the oil production rate of the block. At the same time, the pipe string also has negative pressure oil production and oil pipe strong straightening functions, which can increase the liquid production of the oil well and prevent the oil pipe from winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a water injection-steam injection column;

[0022] Figure 2 It is a schematic diagram of the water injection-oil production string.

[0023] Among them: 1. Casing; 2. Sucker rod; 3. Water injection string; 4. Tubing centralizer; 5. Double tube packer; 6. Steam injection insulation tube; 7. Eccentric packer; 8. Rod pump seat; 9. Pen tip. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 , 2 The specific implementation modes of the present invention are further described.

[0025] An integrated pipe string for coordinated oil production with water injection and steam injection, comprising a casing 1, a water injection pipe string 3 and a steam injection heat insulation pipe 6 are installed in parallel in the casing 1, a bell mouth is installed at the bottom of the water injection pipe string 3, two tubing centralizers 4 are arranged between the water injection pipe string 3 and the outer wall of the steam injection heat insulation pipe 6, a double-tube packer 5 is arranged between the inner wall of the casing 1, the outer wall of the water injection pipe string 3 and the outer wall of the steam injection heat insulation pipe 6, an eccentric packer 7 is arranged between the outer wall of the steam injection heat insulation pipe 6 and the inner wall of the casing 1, a rod pump seat 8 is connected to the bottom of the steam injection heat insulation pipe 6, and a pen tip 9 is installed at the bottom of the rod pump seat 8; a sucker rod 2 is installed in the steam injection heat insulation pipe 6, a rod pump is connected to the bottom of the sucker rod 2, and the rod pump is installed on the rod pump seat 8. The tubing centralizer 4 and the double-tube packer 5 are located above the water injection layer, and the tubing centralizer 4 is located above the double-tube packer 5. The eccentric packer 7 is located between the water injection layer and the oil production layer, and the eccentric packer 7 is located below the double-tube packer 5 .

[0026] A water injection and steam injection huff and puff coordinated oil production process method, with an integrated pipe column, comprises the following steps:

[0027] A. The steam injection insulation pipe 6 with the eccentric packer 7 and the rod pump seat 8 and the water injection string 3 with the double pipe packer 5 are respectively lowered into the predetermined positions, and the water injection string 3 and the steam injection insulation pipe 6 are straightened by the tubing straightener 4;

[0028] B. The eccentric packer 7 is set to isolate the thin oil layer and the heavy oil layer, and the double-tube packer 5 is set to protect the casing 1;

[0029] C. injecting water into the thin oil layer through the water injection column 3;

[0030] D. inject steam into the heavy oil layer through the steam injection insulation pipe 6;

[0031] E. After the steam injection is completed, the sucker rod 2 assembly with the rod pump is lowered into the steam injection insulation pipe 6, and the well is opened for production.

[0032] The sucker rod 2 with a rod pump is lowered into the steam injection insulation pipe 6, and the well is opened for production. Due to the presence of the eccentric packer 7, when the sucker rod 2 with a rod pump is pumped up and down, negative pressure is formed near the rod pump seat 8, thereby improving the liquid supply capacity of the oil-producing layer.

[0033] The present invention adopts a double pipe column structure to respectively inject water and steam into the thin oil and heavy oil layers. The water injection pipe column 3 adopts a conventional oil pipe, and the steam injection heat insulation pipe 6 adopts an insulated oil pipe. The lower part of the steam injection heat insulation pipe 6 is pre-installed with a rod pump seat 8. The oil pipe straightener 4 is inserted into the double pipes every 50m for straightening. The thin oil and heavy oil layers are isolated by an eccentric packer 7. The double pipe packer 5 is inserted into the top of the thin oil layer to protect the casing 1. After the steam injection of the heavy oil layer is completed, the production stage is turned on, and the rod pump and the sucker rod 2 are directly inserted to carry out production, so as to realize the simultaneous development of water injection of the thin oil layer and steam injection of the heavy oil layer.

[0034] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated pipe string for coordinated oil production with water injection and steam injection, characterized in that: The invention comprises a casing (1), wherein a water injection pipe column (3) and a steam injection heat insulation pipe (6) are installed in parallel in the casing (1), a bell mouth is installed at the bottom of the water injection pipe column (3), an oil pipe straightener (4) is arranged between the water injection pipe column (3) and the outer wall of the steam injection heat insulation pipe (6), a double pipe packer (5) is arranged between the inner wall of the casing (1), the outer wall of the water injection pipe column (3) and the outer wall of the steam injection heat insulation pipe (6), an eccentric packer (7) is arranged between the outer wall of the steam injection heat insulation pipe (6) and the inner wall of the casing (1), a rod pump seat (8) is connected to the bottom of the steam injection heat insulation pipe (6), and a pen tip (9) is installed at the bottom of the rod pump seat (8); a sucker rod (2) is installed in the steam injection heat insulation pipe (6), and the bottom of the sucker rod (2) is connected to a rod pump, and the rod pump is installed on the rod pump seat (8).

2. The integrated pipe string for coordinated oil production with water injection and steam injection huff and puff according to claim 1 is characterized in that: The oil pipe centralizer (4) and the double-pipe packer (5) are located above the water injection layer.

3. The integrated pipe string for coordinated oil production with water injection and steam injection huff and puff according to claim 1 is characterized in that: The oil pipe centralizer (4) is located above the double-pipe packer (5).

4. The integrated pipe string for coordinated oil production with water injection and steam injection huff and puff according to claim 1 is characterized in that: The eccentric packer (7) is located between the water injection layer and the oil production layer.

5. The integrated pipe string for coordinated oil production with water injection and steam injection huff and puff according to claim 1 is characterized in that: The eccentric packer (7) is located below the double-tube packer (5).

6. The integrated pipe string for coordinated oil production with water injection and steam injection huff and puff according to claim 1, characterized in that: There are two oil pipe centralizers (4).

7. A water injection and steam injection huff and puff coordinated oil production process, characterized in that: The integrated pipe column according to any one of claims 1 to 6 comprises the following steps: A. The steam injection heat insulation pipe (6) with the eccentric packer (7) and the rod pump seat (8) and the water injection string (3) with the double tube packer (5) are respectively lowered into the predetermined positions, and the water injection string (3) and the steam injection heat insulation pipe (6) are straightened by the tubing straightener (4); B. The eccentric packer (7) is set to isolate the thin oil layer and the heavy oil layer, and the double-tube packer (5) is set to protect the casing (1); C. injecting water into the thin oil layer through the water injection column (3); D. injecting steam into the heavy oil layer through the steam injection insulation pipe (6); E. After the steam injection is completed, the sucker rod (2) with the rod pump is lowered into the steam injection insulation pipe (6) to start the well pumping and production.

8. The water injection and steam injection huff-and-puff coordinated oil production process according to claim 7, characterized in that: In the step E, the sucker rod (2) assembly with the rod pump is lowered into the steam injection insulation pipe (6) to start the well and pump out production; due to the presence of the eccentric packer (7), when the sucker rod (2) assembly with the rod pump pumps up and down, negative pressure is formed near the rod pump seat (8), thereby improving the liquid supply capacity of the oil-producing layer.

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