CN114961686B

CN114961686B - Shale atmospheric fracturing device and system driven by carbon dioxide

Info

Publication number: CN114961686B
Application number: CN202210794487.XA
Authority: CN
Inventors: 张烨; 朱昊; 王清
Original assignee: Chongqing Langfu Environmental Protection Technology Co ltd
Current assignee: Chongqing Langfu Environmental Protection Technology Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2023-06-02
Anticipated expiration: 2042-07-05
Also published as: CN114961686A

Abstract

The invention belongs to the technical field of high-viscosity fluid flow equipment, and provides a carbon dioxide shale gas fracturing device and a system thereof. The invention comprises the following steps: the pipeline is provided with a main pipe and a sub-cavity, and the sub-cavity is positioned in the pipeline and communicated with the main pipe; the pressurizing mechanism is arranged on the pipeline at least at one position and is used for pressurizing the pipeline, so that fluid flow is facilitated; the lubrication increasing mechanism is arranged on the pipeline and comprises an inlet pipe, a liquid pump and an outlet pipe; one end of the inlet pipe is communicated with external liquid; the other end of the inlet pipe is connected with the liquid pump; the outlet pipe is a three-way pipe, and a first pipe orifice of the outlet pipe is connected with the liquid pump and communicated with the liquid pump; the second pipe orifice of the outlet pipe is communicated with the sub-cavity. The device not only can realize carrying high viscosity carbon dioxide, but also can carry any fluid that needs to carry high viscosity simultaneously, and in the design process, how has designed effectively and has avoided cavitation to take place, consequently practical, and effectual, be applicable to the trade and promote.

Description

Shale atmospheric fracturing device and system driven by carbon dioxide

Technical Field

The invention relates to the technical field of high-viscosity fluid flow equipment, in particular to a carbon dioxide flooding shale gas fracturing device and a system thereof.

Background

Under the carbon neutralization background, comprehensive utilization and geological sequestration of carbon dioxide are critical to control of greenhouse gas emission, and the carbon dioxide fracturing modification shale reservoir technology is a leading edge technology capable of modifying shale reservoirs, comprehensively utilizing and sequestering carbon dioxide and improving the recovery ratio of the shale reservoirs.

The carbon dioxide fracturing technology is characterized in that a liquid-liquid two-phase mixed system consisting of liquid CO2, an original rubber liquid and various chemical additives is used for forming an emulsion with CO2 as an inner phase and water as an outer phase to replace a common fracturing fluid. In the process of underground injection, as the temperature rises, after reaching the critical temperature of 31 ℃, liquid CO2 begins to vaporize, and a gas-liquid two-phase dispersion system taking CO2 as an internal phase and water-based fracturing fluid containing high molecular polymers as an external phase is formed.

The fracturing fluid is often presented as a viscous fluid; thus, the high viscosity fluid is injected underground, which increases the difficulty of the operation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a carbon dioxide shale gas fracturing device and a system thereof, which are used for reducing the viscosity of high-viscosity fluid and facilitating the flow of mixed fluid.

In a first aspect, the invention provides a carbon dioxide flooding shale gas fracturing device, which comprises: the pipeline is provided with a main pipe and a branch cavity, and at least one branch cavity is positioned in the pipeline and communicated with the main pipe; the pressurizing mechanism is arranged on the pipeline at least at one position and is used for pressurizing the pipeline so as to facilitate fluid flow; the lubrication increasing mechanism is arranged on the pipeline and comprises an inlet pipe, a liquid pump and an outlet pipe; one end of the inlet pipe is communicated with external liquid; the other end of the inlet pipe is connected with the liquid pump and communicated with the liquid pump; the outlet pipe is a three-way pipe, and a first pipe orifice of the outlet pipe is connected with the liquid pump and communicated with the liquid pump; the second pipe orifice of the outlet pipe is communicated with the sub-cavity.

Further, the moisturizing mechanism further comprises a bubble generator, and the bubble generator is communicated with the third pipe orifice of the outlet pipe. In practical application, the bubble generator is used for generating bubbles, so that the bubbles enter the outlet pipe and enter the pipeline, the bubbles enter the high-viscosity fluid, and the viscosity in the fluid is reduced by utilizing the cracking characteristic of the bubbles.

Further, the bubble generator comprises a motor, a rotating blade, a gas hood and a sleeve; the rotating blade is arranged on the rotating shaft of the motor, the gas hood is arranged above the rotating blade, covers the rotating blade, is fixedly connected with the motor and is connected and communicated with one end of the sleeve, and the other end of the sleeve is connected and communicated with the third pipe orifice of the outlet pipe. In practical use, the design powerfully ensures that air flow can be formed, and the air flow enters the air cover and finally enters the outlet pipe to form bubbles.

Further, the sleeve comprises a main sleeve, a fixed block and a noise reduction section; the main sleeve is connected with the gas hood and communicated with the gas hood; the noise reduction section is arranged in the main sleeve, and is in a spiral blade shape; the fixed block is provided with two parts, the fixed block is arranged at two ends of the noise reduction section, and the fixed block is provided with at least one through hole. In practical application, in order to reduce noise, the design of the noise reduction section is that the noise is reduced, and simultaneously, the spiral blade design adopted by the noise reduction section is also utilized to enable the airflow passing through the noise reduction section to form a vortex shape, so that the vortex-shaped airflow can be used for deeply entering into the fluid with high viscosity, and the fluidity of the fluid can be effectively improved.

Further, the sleeve further comprises a pressurizing pipe, the pressurizing pipe is connected and communicated with the main sleeve, the section of the pressurizing pipe is conical, and the diameter of the pressurizing pipe is gradually reduced in the direction away from the main sleeve. In practical application, the design realizes further pressurization treatment, and further improves the possibility that bubbles enter into the high-viscosity fluid deeply.

Further, the device also comprises an air sleeve, wherein the air sleeve is arranged in the pressurizing pipe and extends out of the pressurizing pipe; the pressurizing pipe is connected with the third pipe orifice of the outlet pipe and communicated with the third pipe orifice; the air jacket is provided with at least one air hole. In practical application, in order to make the formation of bubbles more uniform, the air jacket is provided with a plurality of air holes, so that the air holes can conveniently form bubbles at the same time.

Further, the pressurizing pipe further comprises a liquid sleeve, one end of the liquid sleeve is connected and communicated with the third pipe orifice of the outlet pipe, and the other end of the liquid sleeve is connected and communicated with the air sleeve; the liquid jacket also has a flow inlet tube in fluid communication with the exterior. In practical application, the purpose of the design is to reduce cavitation of the pipeline wall after bubbles directly enter the pipeline, and the bubbles enter liquid, namely water, and the water is introduced into high-viscosity fluid in the pipeline, so that when the bubbles are broken, the bubbles are directly broken in the water, the water is transferred to the high-viscosity fluid, and the high-viscosity fluid utilizes the high-viscosity liquid tension of the high-viscosity fluid to reduce shock waves generated on the pipeline wall when a steam drum is broken; at the same time, the broken bubbles, the water originally coated on the bubbles, are simultaneously distributed to the periphery of the broken bubbles and are concurrent with water drops; therefore, water drops can enter the high-viscosity fluid more conveniently, and the fluidity of the high-viscosity fluid is improved more conveniently.

Further, the device also comprises a one-way valve, wherein the one-way valve is arranged in the air sleeve and is close to the direction of the liquid sleeve. In practical application, the design avoids liquid backflow.

According to the technical scheme, the beneficial effects of the carbon dioxide shale gas fracturing device provided by the invention are that;

in practical application, the design effectively utilizes the characteristics of mixing bubbles with liquid and reducing viscosity, and realizes the transportation of high-viscosity carbon dioxide in a pipeline; in practical design, the pressurizing mechanism is common equipment, so that the pressurizing mechanism is not repeated; the purpose is to increase the pressure of the pipeline, thereby facilitating the transportation of the pipeline to the underground; meanwhile, in order to facilitate transportation, the moistening mechanism is designed to increase the fluidity of the whole viscous carbon dioxide fluid. And may also be lubricated with a liquid, which is commonly water.

In a second aspect, the invention also provides a carbon dioxide shale gas fracturing system, which comprises a high-pressure carbon dioxide storage device connected in sequence; at least one booster pump, energy-accumulating fluid storage and flow regulator; the flow regulator is arranged on the pipeline and is communicated with the pipeline.

According to the technical scheme, the beneficial effects of the carbon dioxide shale gas fracturing system provided by the invention are shown; in practical application, the system ensures continuous supply of continuous high-pressure high-viscosity carbon dioxide liquid, so that phenomena such as shale gas leakage or gas leakage and the like can not occur in the shale gas driving process.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings that are used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.

FIG. 1 is a schematic diagram of a front view structure of a carbon dioxide driven shale gas fracturing device of the invention;

FIG. 2 is a schematic view of a sleeve according to the present invention;

FIG. 3 is a schematic diagram of a carbon dioxide driven shale gas fracturing system according to the present invention;

reference numerals:

the pipeline 1, the main pipe 11, the sub-cavity 12, the pressurizing mechanism 2, the moisturizing mechanism 3, the inlet pipe 31, the liquid pump 32, the outlet pipe 33, the first pipe orifice 331, the second pipe orifice 332, the third pipe orifice 333, the bubble generator 34, the motor 341, the rotating blade 342, the gas hood 343, the sleeve 344, the main sleeve 3441, the fixed block 3442, the noise reduction section 3443, the pressurizing pipe 345, the liquid sleeve 3451, the inflow pipe 3452, the gas sleeve 4, the air hole 41, the one-way valve 5, the through hole 100, the high-pressure carbon dioxide storage 6, the booster pump 7, the energy-collecting fluid storage 8 and the flow regulator 9.

Detailed Description

Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.

An embodiment is substantially as shown in figures 1 to 3 of the accompanying drawings:

example 1:

as shown in fig. 1-2, the carbon dioxide shale gas fracturing device and the system thereof provided in this embodiment can form bubbles in the pipeline 1, reduce viscosity of high-viscosity fluid, and facilitate fluid flow.

The invention provides a carbon dioxide shale gas fracturing device and a system thereof, wherein the device comprises: a pipe 1, wherein the pipe 1 is provided with a main pipe 11 and a sub-cavity 12, and the sub-cavity 12 is positioned in the pipe 1 at least one place and is communicated with the main pipe 11; the pressurizing mechanism 2 is arranged on the pipeline 1 at not less than one place, and the pressurizing mechanism 2 is used for pressurizing the pipeline 1 so as to facilitate fluid flow; the lubrication increasing mechanism 3 is arranged on the pipeline 1, and the lubrication increasing mechanism 3 comprises an inlet pipe 31, a liquid pump 32 and an outlet pipe 33; one end of the inlet pipe 31 is in fluid communication with the outside; the other end of the inlet pipe 31 is connected with the liquid pump 32 and communicated with the liquid pump; the outlet pipe 33 is a three-way pipe, and a first pipe orifice 331 of the outlet pipe 33 is connected with the liquid pump 32 and communicated with the liquid pump 32; the second orifice 332 of the outlet tube 33 communicates with the subchamber 12. In practical application, the design effectively utilizes the characteristics of mixing bubbles with liquid and reducing viscosity, and realizes the transportation of high-viscosity carbon dioxide in the pipeline 1; in practical design, the pressurizing mechanism 2 is a common device, so that the description is omitted; the purpose is to increase the pressure of the pipeline 1, thereby facilitating the transportation of the pipeline to the underground; meanwhile, the moisturizing means 3 is designed to increase the fluidity of the whole viscous carbon dioxide fluid for convenience of transportation. And may also be lubricated with a liquid, which is commonly water.

In this embodiment, the moisturizing means 3 further comprises a bubble generator 34, and the bubble generator 34 is in communication with the third nozzle 333 of the outlet tube 33. In practice, the bubble generator 34 is used to generate bubbles, so that the bubbles enter the outlet pipe 33 and enter the pipeline 1, thus the bubbles enter the fluid with high viscosity, and the viscosity in the fluid is reduced by utilizing the characteristics of the rupture of the bubbles.

In this embodiment, the bubble generator 34 includes a motor 341, a rotor blade 342, a gas cap 343, and a sleeve 344; the rotating vane 342 is mounted on the rotating shaft of the motor 341, the air cover 343 is disposed above the rotating vane 342, covers the rotating vane 342, is fixedly connected with the motor 341, is connected and communicated with one end of the sleeve 344, and the other end of the sleeve 344 is connected and communicated with the third nozzle 333 of the outlet pipe 33. In practice, the design provides a strong assurance that an air flow will be established, into the air shroud 343 and eventually into the outlet tube 33, forming bubbles.

In this embodiment, the sleeve 344 includes a main sleeve 3441, a fixed block 3442, and a noise reduction section 3443; the main sleeve 3441 is connected to and communicates with the air cap 343; the noise reduction section 3443 is installed in the main sleeve 3441, and the noise reduction section 3443 is in a spiral blade shape; the fixed block 3442 has two places, the fixed block 3442 is installed at both ends of the noise reduction section 3443, and the fixed block 3442 has not less than one through hole 100. In practical application, in order to reduce noise, the design of the noise reduction section 3443 is that the noise is reduced, and meanwhile, the spiral blade design adopted by the noise reduction section 3443 is also utilized to enable the airflow passing through the noise reduction section to form a vortex shape, so that the vortex-shaped airflow can be used for deeply entering into the fluid with high viscosity, and the fluidity of the fluid can be effectively improved.

In this embodiment, the sleeve 344 further includes a pressurizing pipe 345, the pressurizing pipe 345 is connected to and communicates with the main sleeve 3441, the pressurizing pipe 345 has a tapered cross section, and the diameter of the pressurizing pipe 345 is gradually reduced in a pipe direction away from the main sleeve 3441. In practical application, the design realizes further pressurization treatment, and further improves the possibility that bubbles enter into the high-viscosity fluid deeply.

In the present embodiment, the air jacket 4 is further included, and the air jacket 4 is installed in the pressurizing pipe 345 and extends outwards of the pressurizing pipe 345; the pressurizing pipe 345 is connected to and communicates with the third nozzle 333 of the outlet pipe 33; the air jacket 4 has no less than one air hole 41. In practical application, the plurality of air holes 41 of the air jacket 4 are designed to facilitate the formation of air bubbles at the same time, so as to make the formation of air bubbles more uniform.

In this embodiment, the pressurizing pipe 345 further includes a liquid jacket 3451, one end of the liquid jacket 3451 is connected to and communicates with the third nozzle 333 of the outlet pipe 33, and the other end of the liquid jacket 3451 is connected to and communicates with the air jacket 4; the jacket 3451 also has an inlet tube 3452, the inlet tube 3452 being in fluid communication with the outside. In practical application, the purpose of the design is to reduce cavitation of the wall of the pipeline 1 after bubbles directly enter the pipeline 1, and the bubbles enter liquid, namely water, and the water is introduced into the high-viscosity fluid in the pipeline 1, so that when the bubbles are broken, the bubbles are directly broken in the water, the water is transferred to the high-viscosity fluid and the high-viscosity fluid, and the high-viscosity liquid tension of the bubbles is utilized to reduce shock waves generated on the wall of the pipeline 1 when a steam drum is broken; at the same time, the broken bubbles, the water originally coated on the bubbles, are simultaneously distributed to the periphery of the broken bubbles and are concurrent with water drops; therefore, water drops can enter the high-viscosity fluid more conveniently, and the fluidity of the high-viscosity fluid is improved more conveniently.

In this embodiment, the air jacket further comprises a one-way valve 5, and the one-way valve 5 is installed in the air jacket 4 and is close to the direction of the liquid jacket 3451 pipe 344. In practical application, the design avoids liquid backflow.

Example 2:

as shown in fig. 3, in this embodiment, there is further provided a carbon dioxide flooding shale gas fracturing system, including a high-pressure carbon dioxide storage 6 connected in sequence; at least one booster pump 7, energy-accumulating fluid reservoir 8 and flow regulator 9; the flow regulator is arranged on the pipeline and is communicated with the pipeline. In practical application, the system ensures continuous supply of continuous high-pressure high-viscosity carbon dioxide liquid, so that phenomena such as shale gas leakage or gas leakage and the like can not occur in the shale gas driving process.

In actual operation, the pressurizing mechanism 2 is started first, and at the same time, the liquid pump 32 is started, the inflow pipe 3452 is firstly filled with water to enter the liquid sleeve 3451, and finally the motor 341 is started.

To sum up, this carbon dioxide drives shale atmospheric pressure and splits device and system thereof not only can realize carrying high viscosity carbon dioxide, also can carry the fluid that any needs carried high viscosity simultaneously, has especially designed the in-process, has designed how effectively to avoid cavitation to take place, therefore practical, and effectual, is applicable to the trade and promotes.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims

1. The utility model provides a carbon dioxide drives shale atmospheric pressure and splits device which characterized in that includes:

the pipeline is provided with a main pipe and a branch cavity, and at least one branch cavity is positioned in the pipeline and communicated with the main pipe;

the pressurizing mechanism is arranged on the pipeline at least at one position and is used for pressurizing the pipeline so as to facilitate fluid flow; and

The lubrication increasing mechanism is arranged on the pipeline and comprises an inlet pipe, a liquid pump and an outlet pipe; one end of the inlet pipe is communicated with external liquid; the other end of the inlet pipe is connected with the liquid pump and communicated with the liquid pump; the outlet pipe is a three-way pipe, and a first pipe orifice of the outlet pipe is connected with the liquid pump and communicated with the liquid pump; the second pipe orifice of the outlet pipe is communicated with the sub-cavity;

the moisturizing mechanism further comprises a bubble generator which is communicated with the third pipe orifice of the outlet pipe; the bubble generator comprises a motor, a rotating blade, a gas hood and a sleeve; the rotating blade is arranged on the rotating shaft of the motor, the gas hood is positioned above the rotating blade, covers the rotating blade, is fixedly connected with the motor and is connected and communicated with one end of the sleeve, and the other end of the sleeve is connected and communicated with the third pipe orifice of the outlet pipe; the sleeve comprises a main sleeve, a fixed block and a noise reduction section; the main sleeve is connected with the gas hood and communicated with the gas hood; the noise reduction section is arranged in the main sleeve, and is in a spiral blade shape; the fixed blocks are arranged at two positions and are arranged at two ends of the noise reduction section, and the fixed blocks are provided with at least one through hole; the sleeve pipe still includes the pressurization pipe, the pressurization pipe with main sleeve pipe is connected and communicates with each other, the pressurization pipe cross-section is the toper, and in the pipe direction that keeps away from main sleeve pipe, the diameter of pressurization pipe diminishes gradually.

2. The carbon dioxide-driven shale gas fracturing apparatus of claim 1, further comprising a gas jacket mounted in said pressurized pipe and extending outwardly of the pressurized pipe; the pressurizing pipe is connected with the third pipe orifice of the outlet pipe and communicated with the third pipe orifice; the air jacket is provided with at least one air hole.

3. The carbon dioxide driven shale gas fracturing device of claim 2, wherein the pressurizing pipe further comprises a liquid sleeve, one end of the liquid sleeve is connected with and communicated with the third pipe orifice of the outlet pipe, and the other end of the liquid sleeve is connected with and communicated with the gas sleeve; the liquid jacket also has a flow inlet tube in fluid communication with the exterior.

4. A carbon dioxide gas-driven shale gas fracturing apparatus according to claim 3, further comprising a one-way valve mounted in said gas jacket and in close proximity to the liquid jacket.

5. A carbon dioxide-driven shale gas fracturing system, comprising a carbon dioxide-driven shale gas fracturing device of any of claims 1-4; a high-pressure carbon dioxide storage device connected in sequence; at least one booster pump, energy-accumulating fluid storage and flow regulator; the flow regulator is arranged on the pipeline and is communicated with the pipeline.