CN217080422U - Double-pipe water injection device of ultra-deep fracture-cavity reservoir oil well - Google Patents
Double-pipe water injection device of ultra-deep fracture-cavity reservoir oil well Download PDFInfo
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- CN217080422U CN217080422U CN202220252670.2U CN202220252670U CN217080422U CN 217080422 U CN217080422 U CN 217080422U CN 202220252670 U CN202220252670 U CN 202220252670U CN 217080422 U CN217080422 U CN 217080422U
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Abstract
The application relates to a double-pipe water injection device of an ultra-deep fracture-cavity reservoir oil well. The double-pipe water injection device comprises an oil pipe, a water taking pipe column, a second packer, a first packer, a water storage tank, a water injection pump and a sleeve; the sleeve is fixedly installed in the oil well, the bottom end of the oil pipe is inserted into the sleeve, the second packer and the first packer are both arranged in the annulus and sleeved on the outer peripheral side of the oil pipe, and the bottom end of the water taking pipe column is inserted into the sleeve and is communicated with the annulus after penetrating through the first packer; the sleeve is communicated with the high-pressure water layer through a perforation, and the pipe part of the oil pipe, which is opposite to the perforation, is an anti-erosion pipe part. The method is stable and reliable, can save a great amount of construction cost of water source wells and bottom surface matching construction cost of water injection development, greatly saves development investment or cost, and improves the economic benefit of carbonate reservoir development.
Description
Technical Field
The application relates to the technical field of oil well exploitation, in particular to a double-pipe water injection device of 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 a causal relationship with the fault and karst action are main oil storage spaces, the fracture surfaces or cracks are main flow channels, and the matrix is basically free of oil gas or contains little oil gas.
For example, the oil reservoir formed by the Ordovician carbonate rock sedimentary structure evolution history in the platform basin region of the Tarim basin 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 sliding fracture is short, namely a few meters to tens of meters is short, and a large amount of the sliding fracture is dozens of meters to hundreds of meters. Oil deposits on flat surfaces each exhibit significant long wall-like characteristics. And secondly, the distance between the sliding fractures for controlling the oil reservoir distribution is large, the shortest distance is 15 kilometers at present, and the width can reach dozens or hundreds of kilometers. Thirdly, the height of the oil column of the oil reservoir is larger, and the height of the oil column of the oil reservoir from north to south is gradually increased on the whole. And fourthly, the rock reservoir has high heterogeneity, and even if the rock reservoir is an adjacent well, the production performance characteristics of the rock reservoir are often greatly different.
At present, after the oil well of the Ordovician carbonate rock oil reservoir in the platform basin area of the Tarim basin is put into development, the production characteristics of high initial yield and fast yield decrease often appear, and the artificial water injection for energy supplement development is generally needed to be carried out after about two years of production. According to the common practice of water injection development of general oil fields, when a specific oil reservoir is transferred to water injection development, a large and 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 Ordovician carbonate reservoir in the platform basin region of the Tarim basin has the four characteristics, the oil well has high dispersion degree on the plane and long linear extension distance, a water injection pipe network of thousands or even tens of thousands of meters is laid, a plurality of water injection stations, water distribution rooms and supercharging devices are built, and the oil well 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 the ultra-deep fracture-cavity reservoir oil well, and provides the double-pipe water injection device of the ultra-deep fracture-cavity reservoir oil well, which can solve the problem that the development cost of the traditional water injection mode is high.
The application relates to a double-pipe water injection device of an ultra-deep fracture-hole reservoir oil well, which comprises an oil pipe, a water taking pipe column, a second packer, a first packer, a water storage tank, a water injection pump and a sleeve; the casing is fixedly installed in an oil well, the bottom end of the oil pipe is inserted into the casing, an annulus is formed between the oil pipe and the casing, the second packer and the first packer are both arranged in the annulus and sleeved on the outer peripheral side of the oil pipe, and the bottom end of the water taking pipe column is inserted into the casing and is communicated with the annulus after penetrating through the first packer; the top end of the water taking tubular column is communicated with one end of a water storage tank, the other end of the water storage tank is communicated with one end of a water injection pump, the other end of the water injection pump is communicated with the top end of the oil pipe, and the water storage tank and the water injection pump are both arranged on the outer side of the top of the oil well; the casing pipe is communicated with the high-pressure water layer through a perforation, the pipe portion of the oil pipe, which is opposite to the perforation, is an anti-erosion pipe portion, and the perforation is located between the first packer and the second packer.
The first packer and the second packer can be both eccentric packers, and a perforation mechanism is arranged at the bottom end of the water taking pipe column; when the first packer and the second packer are set, the peripheral side surface of the first packer and the peripheral side surface of the second packer are tightly attached to the inner wall surface of the sleeve.
The double-pipe water injection device of the ultra-deep fracture-cave type reservoir oil well is novel in structure, is a rock oil well water injection and oil extraction device which is a whole set of system and stable and reliable, can utilize a high-pressure water layer drilled by the oil well per se to serve as a power source spring for water injection work, enables oil extraction without building a water source well, saves device cost and development investment, saves energy consumption, and improves benefits.
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 double-pipe water injection device of an ultra-deep fracture-cavity reservoir oil well in the application.
Reference numerals: the water injection device comprises a casing 1, an annular space 11, a perforation 12, an oil pipe 2, an anti-erosion pipe 21, a water storage tank 23, a water injection pump 24, a first packer 31, a second packer 32, a high-pressure water layer 4 and a water taking pipe column 5.
Detailed Description
The present application is further described in conjunction with the following examples.
The specific embodiment of a double-barrelled water injection device of ultra-deep fracture-cavity type reservoir oil well of this application, as shown in fig. 1, includes oil pipe 2, water intaking tubular column 5, first packer 31, second packer 32, water injection pump 24, water storage tank 23 and sleeve pipe 1. The casing 1 is fixedly installed in the oil well. The well is a prior art vertical well, which is understood to be vertical from the top of the well to the bottom of the well, and the well is constructed from a completion string. The well completion pipe column comprises a well completion pipe column body, a drill rod, a packer, a temporary plugging ball seat and the like, and the well completion pipe column construction method comprises the steps of drilling in a grading mode and adding various casings with different specifications in a grading mode, so that an oil well with a multistage ladder structure is formed.
In this embodiment, the casing 1 is fixedly installed in the well, and the bottom end of the tubing 2 is inserted into the casing 1 and connected to the first packer 31 and the second packer 32. An annular space 11 is formed between the oil pipe 2 and the casing 1, and the first packer 31 and the second packer 32 are both arranged in the annular space 11 and sleeved on the outer peripheral side of the oil pipe 2. The bottom end of the water intake pipe column 5 is inserted into the sleeve and is communicated with the annular space after passing through the first packer 31.
In this embodiment, the top of water intaking tubular column 5 communicates with the one end of water storage tank 23, and the other end of water storage tank 23 communicates with the one end of water injection pump 24, and the other end of water injection pump 24 communicates with the top of oil pipe 2, and water storage tank 23 and water injection pump 24 all locate the oil well top outside. The water taking pipe column 5, the water storage tank 23, the water injection pump 24 and the oil pipe can be communicated through pipelines.
The well has a high pressure water layer 4, the casing 1 is in communication with the high pressure water layer 4 through perforations 12 penetrating the casing 1 and penetrating the formation within the high pressure water layer 4. The pipe part of the oil pipe 2 facing the perforation 12 is an erosion-resistant pipe part 21, the erosion-resistant pipe part 21 can be an erosion-resistant pipe part on the whole pipe section around the circumference, and the outer surface of the pipe contacting with the water flow flowing out from the perforation 12 can also be an erosion-resistant pipe part. The first packer 31 is located above the high pressure water layer 4 in the height direction, and the second packer 32 is located below the high pressure water layer 4 in the height direction. That is, the perforations 12 are located between the first packer 31 and the second packer 32. It should be noted that when the first packer 31 is set, the outer circumferential side surface of the first packer 31 abuts against the inner wall surface of the casing 1; when the second packer 32 is set, the outer circumferential side of the second packer 32 abuts against the inner wall surface of the casing 1.
It should be noted that the bottom end of the water intake pipe column 5 is provided with a perforation mechanism, and the perforation mechanism can be a traditional perforation structure; an oil extraction pump is arranged in the oil pipe 2, and the oil extraction pump can be a traditional electric submersible pump. The connection between second packer 32, first packer 31, water intaking tubular column 5 and oil pipe 2 can be installed in advance before going into the well, can reduce the construction degree of difficulty of installing again after going into the well like this to joint strength is better, and job stabilization nature is better.
In this embodiment, the first packer 31 and the second packer 32 may both be eccentric packers in order to make the device simpler and more compact. That is, neither the tubing string 2 nor the intake string 5 passes through the center positions of the first packer 31 and the second packer 32. The oil pipe 2 and the water taking pipe column 5 can be symmetrically arranged and are located on the same first packer 31, and the volume of a plurality of packers or changing packers is not required to be additionally arranged. For example, the first packer 31 may be set to a depth of about 1000m below, a depth of about 3000m-3900m below the high pressure water layer 4, and a depth of about 4600m below the second packer 32.
When needs carry out the water injection toward oil pipe 2, high pressure water layer 4 is through 12 toward annular space 11 interior water injections of perforation, and 11 internal pressure in annular space can increase gradually to utilize high pressure water layer 4's natural energy, groundwater gets into from the bottom of water intaking tubular column 5, in the top of water intaking tubular column 5 flows out to water storage tank 23, need not to set up pumping device this moment, can the energy saving and reduce equipment cost. Then, the water injection pump 24 is started, and the water in the water storage tank 23 is pumped by the water injection pump 24 and conveyed to the oil pipe 2, thereby injecting water into the oil well. The water storage tank 23 and the water injection pump 24 are arranged outside the oil well, so that the assembly and the control use are more convenient.
Because the water pressure at the high-pressure water layer is high, and the water from the high-pressure water layer can carry gravel, chemical corrosive substances and the like, the high-pressure water impacts the common oil pipe to erode the oil pipe, so that the service life of the oil pipe is shortened, the oil pipe is easy to damage, even the oil pipe can be eroded or dispersed, and therefore the outer wall of the oil pipe at the high-pressure water layer, namely the erosion-resistant pipe part, can be subjected to erosion-resistant treatment. The anti-erosion treatment mode can select various methods such as thickening the wall thickness of the oil pipe, plating an anti-erosion layer on the outer surface, arranging a reinforcing sleeve and the like so as to enhance the capability of the anti-erosion pipe part for resisting high-pressure water.
The double-pipe water injection device of the ultra-deep fracture-cave reservoir oil well is novel in structure, is a rock oil well same-well water injection and oil extraction device which is a whole set of system and is stable and reliable, and can utilize a high-pressure water layer drilled by the oil well as a power source spring for water injection work, so that the oil extraction does not need to build a water source well, the device cost and the development investment are saved, the energy consumption is saved, and the benefit is improved.
The specific implementation mode of the double-pipe water injection method for the ultra-deep fracture-cavity reservoir oil well comprises the following steps:
firstly, setting an oil pipe 2 and a water taking pipe column 5 with a first packer 31 and a second packer 32 installed;
secondly, setting the second packer 32 to enable the second packer 32 to be tightly attached to the casing 1 to form sealing;
thirdly, setting the first packer 31 to enable the first packer 31 to be tightly attached to the casing 1 to form sealing;
fourthly, a perforating mechanism at the bottom end of the water taking pipe column 5 conducts directional perforating communication on the high-pressure water layer 4 and the sleeve 1 at the corresponding position of the high-pressure water layer to form a perforation 12, so that the annular space 11 is communicated with the water taking pipe column 5;
monitoring the water surface of the water taking pipe column 5, if the water surface of the water taking pipe column 5 does not submerge the water injection pump 24, performing the sixth step, and if the water surface of the water taking pipe column 5 submerges the water injection pump 24, performing the seventh step;
sixthly, manually supplementing water to the water taking pipe column 5 until the water surface of the water taking pipe column 5 submerges the water injection pump 24;
seventhly, starting a water injection pump 24 to enable water in the water injection pipe column to flow back to the oil pipe 2;
eighthly, observing the pressure of the oil pipe 2 and the pressure of the water taking pipe column 5, stopping the water injection pump 24 after the pressure of the oil pipe 2 meets oil extraction conditions, and stopping the well for a period of time to start oil extraction work of the oil pipe 2;
and step nine, after the pressure of the oil pipe gradually drops to a preset value, repeating the step f, the step g and the step h, and starting the next round of water injection.
According to the double-pipe water injection method for the ultra-deep fracture-cavity reservoir oil well, the high-pressure water layer drilled by the oil well is utilized, a closed-loop system for water taking, water injection and oil extraction in the same well is realized through a proper downhole tool, a construction process and a wellhead device, the system is stable and reliable, huge 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 benefits of carbonate reservoir development are 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 modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (4)
1. A double-pipe water injection device for an ultra-deep fracture-cavity reservoir oil well is characterized by comprising an oil pipe, a water taking pipe column, a second packer, a first packer, a water storage tank, a water injection pump and a sleeve;
the casing is fixedly installed in an oil well, the bottom end of the oil pipe is inserted into the casing, an annulus is formed between the oil pipe and the casing, the second packer and the first packer are both arranged in the annulus and sleeved on the outer peripheral side of the oil pipe, and the bottom end of the water taking pipe column is inserted into the casing and is communicated with the annulus after penetrating through the first packer;
the top end of the water taking tubular column is communicated with one end of a water storage tank, the other end of the water storage tank is communicated with one end of a water injection pump, the other end of the water injection pump is communicated with the top end of the oil pipe, and the water storage tank and the water injection pump are both arranged on the outer side of the top of the oil well;
the casing pipe is communicated with the high-pressure water layer through a perforation, the pipe portion of the oil pipe, which is opposite to the perforation, is an anti-erosion pipe portion, and the perforation is located between the first packer and the second packer.
2. The dual injection apparatus for an ultra-deep-fracture-cavity reservoir oil well of claim 1, wherein the first packer and the second packer are both eccentric packers.
3. The double-pipe water injection device for the ultra-deep fracture-cavity type reservoir oil well is characterized in that a perforation mechanism is arranged at the bottom end of the water taking pipe column.
4. The double-pipe water injection device for the ultra-deep fracture-cavity reservoir oil well as defined by any one of claims 1 to 3, wherein when the first packer and the second packer are set, the outer peripheral side surface of the first packer and the outer peripheral side surface of the second packer are both tightly attached to the inner wall surface of the casing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220252670.2U CN217080422U (en) | 2022-02-07 | 2022-02-07 | Double-pipe water injection device of ultra-deep fracture-cavity reservoir oil well |
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| CN202220252670.2U CN217080422U (en) | 2022-02-07 | 2022-02-07 | Double-pipe 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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| CN114320254A (en) * | 2022-02-07 | 2022-04-12 | 成都汉科石油技术有限公司 | Double-pipe water injection device and method for ultra-deep fracture-cavity reservoir oil well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320254A (en) * | 2022-02-07 | 2022-04-12 | 成都汉科石油技术有限公司 | Double-pipe water injection device and method for ultra-deep fracture-cavity reservoir oil well |
| CN114320254B (en) * | 2022-02-07 | 2024-07-02 | 成都汉科石油技术有限公司 | Double-pipe water injection device and method for ultra-deep fracture-cavity type reservoir oil well |
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