CN217001800U - Self-flowing water injection device of ultra-deep fracture-cavity reservoir oil well - Google Patents
Self-flowing water injection device of ultra-deep fracture-cavity reservoir oil well Download PDFInfo
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- CN217001800U CN217001800U CN202220260307.5U CN202220260307U CN217001800U CN 217001800 U CN217001800 U CN 217001800U CN 202220260307 U CN202220260307 U CN 202220260307U CN 217001800 U CN217001800 U CN 217001800U
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Abstract
The application relates to a self-flowing water injection device of an ultra-deep fracture-cavity reservoir oil well, which comprises an oil pipe, a packer, a water injection and oil extraction conversion valve and a sleeve; the casing is arranged in the oil well, the bottom end of the oil pipe is inserted into the casing, the top end of the oil pipe is communicated with external oil extraction equipment, an annulus is formed between the pipe column and the casing, and the packer is arranged in the annulus and sleeved on the outer peripheral side of the pipe column; the oil well is provided with a high-pressure water layer, the casing is communicated with the high-pressure water layer through a perforation, the pipe part of the oil pipe, which is opposite to the perforation, is an anti-erosion pipe part, the water injection and oil extraction change-over valve is arranged in the oil pipe and used for controlling the connection or disconnection between the interior of the oil pipe and the exterior, the water injection and oil extraction change-over valve is positioned above the high-pressure water layer in the height direction, and the packer is positioned below the high-pressure water layer in the height direction. This application can utilize the high-pressure water layer of oil well self as annotating the water source, need not to build the water source well, saves device cost and development investment.
Description
Technical Field
The application relates to the technical field of oil well exploitation, in particular to an automatic water injection device for an ultra-deep fracture-cavity reservoir oil well.
Background
One of the important characteristics of ultra-deep fracture-cave carbonate reservoirs with depths exceeding 5000 meters is that the caverns which have causative relationship with faults, fractures and karst action are main oil storage spaces, the fracture surfaces or fractures are main flow channels, and the matrix is basically free of oil gas or contains little oil gas. Generally has the following characteristics: firstly, the oil deposit unit is mainly walked smooth fracture exhibition and is distributed along the logical source behind a plurality of monomer oil deposits on the plane, walks the short then kilometer of oil deposit extending distance, tens of kilometers along the fracture, and the length then tens of kilometers or even hundreds of kilometers. The extension distance along the two sides of the walking and sliding fracture is short, the extension distance is from several meters to dozens of meters in a short period, and the extension distance is from dozens of meters to hundreds of meters in a long period. Oil deposits on flat surfaces each exhibit a pronounced long-walled character. And secondly, the distance between the sliding fractures for controlling the oil reservoir distribution is large, and the width of the fracture can reach dozens or hundreds of kilometers. Thirdly, the height of the oil column of the oil reservoir is larger. And fourthly, the fracture-cave carbonate reservoir has high heterogeneity, and even if the fracture-cave carbonate reservoir is an adjacent well, the production performance characteristics of the fracture-cave carbonate reservoir are greatly different.
At present, after an oil well of the ultra-deep fracture-cave carbonate reservoir is put into development, the production characteristics of high initial-stage yield and rapid yield decrease often appear, and manual water injection for energy supplement development is generally needed to be carried out after about two years of putting into production. According to the common practice of water injection development of a common oil field, when a specific oil reservoir is transferred into water injection development, a special water injection source well is needed, water injection pipelines are laid, water injection stations and water distribution rooms are built, sterilization, filtration, single-well pressurization facilities are arranged, and the like. Because the carbonate reservoir has the four characteristics, the oil well has high dispersion degree on the plane, long linear extension distance, and is paved with water injection pipe networks of thousands or even tens of thousands of meters, and a plurality of water injection stations, water distribution rooms and supercharging devices are built, which is unacceptable for the ultra-deep-fracture-cavity carbonate reservoir developed marginally.
SUMMERY OF THE UTILITY MODEL
The application aims to solve the problems existing in the development of ultra-deep fracture-cavity reservoir oil wells, and provides the gravity flow water injection device of the ultra-deep fracture-cavity reservoir oil wells, which can solve the problem that the development cost of the traditional water injection mode is high in the past.
The application relates to a self-flowing water injection device of an ultra-deep fracture-cavity reservoir oil well, which comprises an oil pipe, a packer, a water injection and oil extraction conversion valve and a sleeve; the sleeve is arranged in an oil well, the bottom end of the oil pipe is inserted into the sleeve, the top end of the oil pipe is communicated with external oil production equipment, an annulus is formed between the oil pipe and the sleeve, and the packer is arranged in the annulus and sleeved on the outer peripheral side of the oil pipe; the sleeve is communicated with the high-pressure water layer through a perforation, the pipe part of the oil pipe, which is right opposite to the perforation, is an anti-erosion pipe part, the oil pipe is also provided with the water injection and oil extraction change-over valve, the water injection and oil extraction change-over valve controls the connection or disconnection between the interior of the oil pipe and the perforation, the water injection and oil extraction change-over valve is positioned above the high-pressure water layer, and the packer is positioned below the high-pressure water layer.
The water injection and oil extraction conversion valve can comprise a water injection hole communicated with the inside and the outside of the oil pipe and a plugging mechanism used for plugging the water injection hole, and when the packer is set, the peripheral side surface of the packer is tightly attached to the inner wall surface of the sleeve; the water injection and oil extraction conversion valve is a one-way valve.
The self-flowing water injection device of the ultra-deep fracture-hole type reservoir oil well can utilize a high-pressure water layer encountered by the oil well self-drilling to serve as water injection power, so that a water source well does not need to be built for oil extraction, the device cost and the development investment are saved, the energy consumption is saved, the benefit is improved, and the whole body is stable and reliable.
Drawings
The present application is further explained with the aid of the attached drawings, the embodiments of which do not constitute any limitation of the present application, and further figures can be derived from the following figures, without inventive effort, for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a gravity flow water injection device of an ultra-deep fracture-cavity reservoir oil well in the application.
Reference numerals are as follows: the device comprises a casing 1, an annulus 11, a perforation 12, an oil pipe 2, a water injection and oil extraction conversion valve 20, an anti-erosion pipe part 21, a packer 3 and a high-pressure water layer 4.
Detailed Description
The present application is further described in conjunction with the following examples.
The utility model provides a concrete implementation mode of artesian water injection device of ultra-deep fracture-cavity type reservoir oil well, as shown in figure 1, including oil pipe 2, packer 3 and sleeve pipe 1. The casing 1 is arranged in an oil well, which is a prior art shaft and which may be constructed from a completion string. The well completion pipe column comprises a well completion pipe column body, a drill rod, a packer, a perforator, a temporary plugging ball seat and other parts, and can be used for drilling in a grading manner and adding various casings with different specifications in a grading manner, so that an oil well with a multistage stepped structure is formed. When drilling, the well completion pipe column puts the drill rod and the packer into the casing pipe, the packer seat and the casing pipe are sealed and fixed by pressurizing the drill rod, and a releasing structure is arranged between the packer and the drill rod. For example, the packer is provided with an anchoring seal, the drill pipe reversely opens the anchoring seal of the packer to realize releasing, after releasing is completed, the well completion pipe string is lifted, the oil pipe is put in, and the oil pipe can realize the back-plugging connection with the packer through the back-plugging joint.
In this embodiment, a casing 1 is arranged in the well, and the bottom end of a tubing 2 is inserted into the casing 1 and connected to a packer 3. When the packer 3 is set, the peripheral side surface of the packer 3 is tightly attached to the inner wall surface of the casing 1. The top end of the oil pipe 2 is communicated with external oil extraction equipment, an annular space 11 is formed between the oil pipe 2 and the casing pipe 1, and the packer 3 is arranged in the annular space 11 and sleeved on the periphery side of the oil pipe 2. The high-pressure water layer 4 is arranged outside the oil well, the casing 1 is communicated with the high-pressure water layer 4 through a perforation, the perforation 12 penetrates through the casing 1 and goes deep into a rock stratum in the high-pressure water layer 4, a pipe part of the oil pipe 2, which is opposite to the perforation 12, is an anti-erosion pipe part 21, the anti-erosion pipe part 21 can be an anti-erosion pipe part on the four peripheral surfaces of the whole pipe section, and the outer surface of the pipe, which is in contact with the water flow flowing out of the perforation 12, can also be an anti-erosion pipe part. The oil pipe 2 is also provided with a water injection and oil extraction conversion valve 20, the water injection and oil extraction conversion valve 20 is used for controlling the connection or disconnection between the interior of the oil pipe 2 and the perforation 12, the water injection and oil extraction conversion valve 20 is positioned above the high-pressure water layer 4 in the height direction, and the packer 3 is positioned below the high-pressure water layer 4 in the height direction. In an actual working condition, the water injection and oil extraction conversion valve is arranged at a position with the underground depth of about 1000m, the high-pressure water layer 4 is arranged at a position with the underground depth of 3000m-3900m, and the packer is arranged at a position with the underground depth of up to an oil layer.
It should be noted that the water injection and oil recovery conversion valve 20 is disposed above the high pressure water layer 4, and the distance between the two is long. From the above practical conditions, it can be seen that there is a height difference of at least 2000m, and this design has two advantages. Firstly, because the water injection and oil extraction conversion valve 20 is a long distance away from the high-pressure water layer 4, high-pressure water enters the annular space 11 after coming out of the high-pressure water layer 4, and enters the oil pipe 2 through the water injection and oil extraction conversion valve 20 only after a long distance, so that the water pressure is small, and the erosion of the whole equipment is weakened; second, since the water injection/oil recovery conversion valve 20 is disposed at a position close to the wellhead, it is more convenient to connect and control an off-well control system.
The water injection and oil extraction conversion valve 20 comprises water injection holes communicated with the inside and the outside of the erosion resistant oil pipe 2 and a plugging mechanism used for plugging the water injection holes. It will be appreciated that the water injection and production diverter valve 20 has an inlet communicating with the annulus 11 and an outlet communicating with the interior of the erosion resistant tubing 2. Preferably, the water injection and oil recovery conversion valve 20 may be an electric one-way ball valve. The plugging mechanism is controlled by the outside and can plug or conduct the water injection hole, so that when the oil well is in the jetting or oil extraction process, the plugging mechanism can plug the water injection hole to block the conduction between the annular space 11 and the erosion resistant oil pipe 2, namely the water injection and oil extraction conversion valve 20 is in a closed state; when water needs to be injected into the oil layer, the plugging mechanism controls the water injection hole to conduct the annular space 11 and the erosion-resistant oil pipe 2, and the self-flowing water injection of the high-pressure water layer 4 is realized, so that the pressure in the oil layer is supplemented and improved, and the oil extraction rate is improved. When the oil well needs water injection, the high-pressure water layer 4 injects water into the annular space 11 through the perforation 12, the pressure in the annular space can be gradually increased, when the annular space pressure is greater than the pressure in the erosion-resistant oil pipe, the plugging mechanism is controlled to open the water injection hole, and under the action of the annular space pressure, the underground water in the annular space can automatically flow into the erosion-resistant oil pipe 2 and flow to an oil layer. When the oil well does not need water injection, the plugging mechanism is controlled to disconnect the water injection hole.
Because the water pressure at the high-pressure water layer 4 is high, and the water from the high-pressure water layer 4 is also carried with gravel, chemical corrosive substances and the like, the high-pressure water impacts the common oil pipe 2 to erode the oil pipe 2, which can cause the service life of the oil pipe to be reduced and the problem of damage to the oil pipe easily occurs, even the oil pipe 2 can be eroded or eroded away, therefore, the outer wall at the high-pressure water layer, namely the erosion-resistant pipe part 21 can be treated by erosion resistance, and the erosion-resistant treatment mode can select various methods such as thickening the wall thickness of the oil pipe, plating an erosion-resistant layer on the outer surface, arranging a reinforcing sleeve and the like, so as to enhance the capability of the erosion-resistant pipe part 21 against the high-pressure water.
The self-flowing water injection device of the ultra-deep fracture-cave type reservoir oil well is novel in structure, is a complete set of system, stable and reliable water injection and oil extraction device for the same well of the ultra-deep fracture-cave type carbonate rock oil well, can utilize a high-pressure water layer drilled and encountered by the oil well as water injection power, enables oil extraction without building a water source well, saves device cost and development investment, saves energy consumption, and improves benefits.
The artesian water injection method for the ultra-deep fracture-cavity reservoir oil well can comprise the following steps:
firstly, a completion pipe string and a casing 1 are put in;
secondly, the packer 3 is left in the casing 1, the packer 3 is positioned below the high-pressure water layer 4, then the well completion pipe string is pulled up, and after the process of pulling out the well completion pipe string, the high-pressure water layer 4 and the casing 1 at the corresponding position are subjected to directional perforation to form a perforation 12;
thirdly, the oil pipe 2 is put down, the releasing of the oil pipe 2 is connected with the packer 3, the water injection and oil extraction conversion valve 20 of the oil pipe 2 is positioned above the packer 3, the erosion resistant pipe part 21 is opposite to the perforation hole 12, and the water injection and oil extraction conversion valve 20 is communicated with the perforation hole 12;
fourthly, setting the packer 3 to enable the packer 3 to be tightly attached to the casing 1 to form sealing;
fifthly, closing the water injection and oil extraction conversion valve 20, closing the communication between the oil pipe 2 and the annulus 11, and starting oil extraction by oil extraction equipment;
sixthly, after the oil well stops spraying, the oil extraction equipment stops extracting oil, a water injection and oil extraction conversion valve 20 is opened, the perforation 12 is communicated with the oil pipe 2, and self-flow water injection is formed between the high-pressure water layer 4 and the oil pipe 2;
seventhly, observing the pressure of the well head, closing the water injection and oil extraction conversion valve 20 after determining that the pressure of the well head does not rise any more or the water absorption stops underground, cutting off a channel between the high-pressure water layer 4 and the oil pipe 2, and closing the well;
eighthly, when the pressure of the well head reaches a preset value, the oil extraction equipment starts oil extraction again;
and step nine, repeating the step six, the step seven and the step eight, and starting the second round of artesian water injection and oil extraction work.
The self-flowing water injection method of the ultra-deep fracture-cave reservoir oil well of the embodiment utilizes a high-pressure water layer drilled by the oil well, and realizes a closed-loop system for water taking, water injection and oil extraction in the same well through a proper downhole tool, a construction process and a wellhead device, the system is stable and reliable, a huge amount of water source well construction and water injection development bottom surface matching construction cost can be saved, development investment or cost is greatly saved, and economic benefit of carbonate rock reservoir development is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or substituted equivalently without departing from the spirit and scope of the technical solutions of the present application.
Claims (3)
1. The self-flowing water injection device of the ultra-deep fracture-cavity reservoir oil well is characterized by comprising an oil pipe, a packer, a water injection and oil extraction conversion valve and a sleeve;
the sleeve is arranged in an oil well, the bottom end of the oil pipe is inserted into the sleeve, the top end of the oil pipe is communicated with external oil production equipment, an annulus is formed between the oil pipe and the sleeve, and the packer is arranged in the annulus and sleeved on the outer peripheral side of the oil pipe;
the sleeve is communicated with the high-pressure water layer through a perforation, the pipe part of the oil pipe, which is right opposite to the perforation, is an erosion-resistant pipe part, the oil pipe is also provided with the water injection and oil extraction change-over valve, the water injection and oil extraction change-over valve controls the connection or disconnection between the interior of the oil pipe and the perforation, the water injection and oil extraction change-over valve is positioned above the high-pressure water layer, and the packer is positioned below the high-pressure water layer.
2. The gravity flow water injection device for the oil well of the ultra-deep fractured-vuggy reservoir of claim 1, wherein the water injection and oil extraction conversion valve comprises a water injection hole for communicating the inside and the outside of the oil pipe and a plugging mechanism for plugging the water injection hole.
3. The gravity flow water injection apparatus for an ultra-deep fracture-cavity type reservoir oil well according to claim 2, wherein the water injection and oil recovery conversion valve is a one-way valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220260307.5U CN217001800U (en) | 2022-02-07 | 2022-02-07 | Self-flowing water injection device of ultra-deep fracture-cavity reservoir oil well |
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| CN202220260307.5U CN217001800U (en) | 2022-02-07 | 2022-02-07 | Self-flowing water injection device of ultra-deep fracture-cavity reservoir oil well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320255A (en) * | 2022-02-07 | 2022-04-12 | 成都汉科石油技术有限公司 | Self-flowing water injection device and method for ultra-deep fracture-cavity reservoir oil well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320255A (en) * | 2022-02-07 | 2022-04-12 | 成都汉科石油技术有限公司 | Self-flowing water injection device and method for ultra-deep fracture-cavity reservoir oil well |
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