CN112112621A - High-efficient dry gas fracturing unit system - Google Patents
High-efficient dry gas fracturing unit system Download PDFInfo
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- CN112112621A CN112112621A CN202011052064.8A CN202011052064A CN112112621A CN 112112621 A CN112112621 A CN 112112621A CN 202011052064 A CN202011052064 A CN 202011052064A CN 112112621 A CN112112621 A CN 112112621A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/255—Methods for stimulating production including the injection of a gaseous medium as treatment fluid into the formation
Abstract
The invention discloses a high-efficiency dry gas fracturing machine system, wherein a plurality of groups of dry gas fracturing machines are arranged in parallel, the output ends of the plurality of groups of dry gas fracturing machines are connected with output pipelines, the output pipelines of the plurality of groups of dry gas fracturing machines are communicated with a main gas pipeline after being connected in parallel, a fracturing machine system controller is used for regulating and controlling the high-efficiency dry gas fracturing machine system, and the output of the main gas pipeline is connected with an oil well pipeline; the system comprises a plurality of groups of dry gas fracturing machines, a main gas pipeline, a pressure booster, a proppant and a rock stratum fracture, wherein the dry gas fracturing machines are used for pressurizing gas, outputting high-pressure gas in parallel, the high-pressure gas enters the main gas pipeline through the output pipeline, and the high-pressure gas is injected into an oil well through the main gas pipeline. The invention does not use water as a medium, saves a large amount of water resources and transportation cost, does not pollute underground water sources, does not have a water return link, does not need to carry out the treatment and transportation of water return, and greatly saves the fracturing cost.
Description
Technical Field
The invention belongs to the technical field of oil gas and coal bed gas exploitation fracturing equipment, and particularly relates to a high-efficiency dry gas fracturing machine system.
Background
Fracturing is the primary method of oil and gas (including shale gas, coal bed gas, tight rock gas) production and stimulation. The underground reservoir is artificially fractured through fracturing, the flow condition and the flow condition of oil or gas in the underground reservoir are improved, and the oil or gas can be extracted from the underground reservoir or the yield is increased.
At present, hydraulic fracturing is generally used for fracturing at home and abroad. Hydraulic fracturing is that water-based fracturing fluid is injected into a well at a high speed by a ground high-pressure pump, the rock of an oil-gas reservoir is fractured to generate cracks by virtue of high pressure suppressed at the bottom of the well, meanwhile, supporting sand with the density being multiple times of that of the reservoir is mixed into the injected liquid after the reservoir is fractured, the supporting sand and fluid enter the cracks and stay in the cracks permanently, and the supporting cracks are in an open state, so that the oil-gas flow environment is improved; the oil or gas which cannot be produced originally can be produced in large quantity, and the original low oil gas yield can greatly improve the yield.
But hydraulic fracturing processes have long been socially controversial. The hydraulic fracturing consumes a large amount of water, and environmental protection people think that a large amount of high-pressure water medium for fracturing rocks enters a stratum to pollute an underground water source, and meanwhile, the treatment of returning drainage water costs a large amount of resources and causes serious pollution; for these reasons, many countries around the world are not using hydraulic fracturing processes, and some countries using hydraulic fracturing processes also take restrictive measures. It is a very urgent matter how to solve the hydraulic fracturing required by oil and gas exploitation and solve the problem of water pollution.
The method for preparing nitrogen on site is adopted, high-pressure nitrogen is used as a fracturing medium, fracturing of an oil-storing and gas-storing rock stratum is completed, no environmental pollution is caused, the operation is simple and convenient, the cost is low, safety and high efficiency are realized, and the fracturing machine system has a wide application prospect.
Disclosure of Invention
The invention aims to provide an efficient dry gas fracturing machine system, which utilizes the advantage of high nitrogen content in air, adopts a mode of on-site nitrogen preparation, takes high-pressure nitrogen as a power source, injects compressed high-energy gas into a stratum to be fractured, and leads oil-gas reservoir rock to be fractured to generate cracks by virtue of a high-pressure gas source suppressed at the bottom of a well, and simultaneously leads the high-pressure gas to carry a crack propping agent to enter the cracks and stay in the cracks permanently, and the propping cracks are in an open state, thus improving the oil-gas flow environment; the oil or gas which cannot be produced originally can be produced in large quantity, and the oil well with low oil gas yield can greatly improve the yield; the system does not use water as a medium, saves a large amount of water resources and transportation cost, does not pollute underground water sources, does not have a water return link, does not need to carry out treatment and transportation of water return, and greatly saves the fracturing cost.
The purpose of the invention can be realized by the following technical scheme:
a high-efficiency dry gas fracturing machine system comprises a dry gas fracturing machine, an output pipeline, a main gas pipeline, a fracturing machine system controller, a supercharger and a proppant mixer; the system comprises a plurality of groups of dry gas fracturing machines, a main gas pipeline, a fracturing machine system controller and an oil well pipeline, wherein the dry gas fracturing machines are arranged in parallel, the output ends of the dry gas fracturing machines are connected with output pipelines, the dry gas fracturing machines are connected in parallel with the main gas pipeline through the output pipelines and are communicated with the main gas pipeline, the fracturing machine system controller is used for regulating and controlling the high-efficiency dry gas fracturing machine system, and the output of the main gas; the dry gas fracturing machines which are arranged in parallel are used for pressurizing gas and outputting high-pressure gas, the high-pressure gas enters the main gas pipeline through the output pipeline, and the high-pressure gas is injected into the oil well pipeline through the main gas pipeline.
As a further scheme of the invention: the gas is nitrogen, and the concentration of the nitrogen is 85-99%.
As a further scheme of the invention: the dry gas fracturing machine comprises an air filter, a screw compressor, a dryer, a nitrogen making machine, a compressor unit, a generator, a pressure gauge, a flow meter and a one-way valve, wherein the air outlet end of the air filter is communicated with the air inlet end of the screw compressor through a pipeline, the air outlet end of the screw compressor is communicated with the air inlet end of the dryer through a pipeline, the air outlet end of the dryer is communicated with the air inlet end of the nitrogen making machine through a pipeline, the air outlet end of the nitrogen making machine is communicated with the air inlet end of the compressor unit, the air outlet end of the compressor unit is connected with an output pipeline, the pressure gauge, the flow meter and the one-way valve are sequentially installed on the output pipeline, and the pressure gauge.
As a further scheme of the invention: the compressor unit comprises a diesel engine and a piston compressor, the diesel engine is a diesel engine, a double output shaft is arranged on the diesel engine, one end of the double output shaft is connected with the screw compressor to preliminarily compress gas, the other end of the double output shaft is connected with the piston compressor to secondarily compress the gas, and the gas pressure output by the compressor unit is 30-50 MPa.
As a further scheme of the invention: and a speed reducer can be arranged between the diesel engine and the piston compressor, and the speed reducer is respectively connected with the diesel engine and the piston compressor.
As a further scheme of the invention: the main gas pipeline comprises a first pipeline and a second pipeline, the output of the first pipeline is connected with the main pipeline, the main pipeline is directly connected into the oil well pipeline, a second control valve is installed on the first pipeline, a supercharging device and a propping agent mixer are arranged on the second pipeline, a first control valve is installed at the gas inlet of the supercharging device, the gas outlet of the supercharging device is communicated with the gas inlet of the propping agent mixer, a one-way stop valve is installed at the gas outlet of the propping agent mixer, and the outlet of the one-way stop valve is communicated with the main pipeline.
As a further scheme of the invention: the pressure increasing device is a plunger type compressor and is formed by connecting a plurality of plunger type compressors in parallel, and a fracturing machine system controller regulates and controls the number and time of opening and closing the plunger type compressors according to the required pressure, loading rate and flow.
As a further scheme of the invention: the proppant mixer is a closed container, a crack proppant is filled in the proppant mixer, and the crack proppant is a quartz sand or ceramsite particle proppant.
As a further scheme of the invention: the fracturing machine system controller is provided with a storage unit and a transmission unit, the storage unit stores fracturing big data, and the transmission unit remotely transmits the fracturing data.
As a further scheme of the invention: the work flow of the high-efficiency dry gas fracturing machine system specifically comprises the following steps:
the method comprises the following steps: air is filtered by an air filter and enters a screw compressor for primary compression, the screw compressor is driven by a diesel engine, the pressure of the compressed air of the screw compressor reaches 1.0-2.5 Mpa, and the flow rate is 15-40 cubic meters per minute;
step two: the air compressed by the screw compressor enters a dryer for drying and dehydration, the air after drying and dehydration enters a nitrogen making machine, and the air is prepared into high-purity nitrogen through the nitrogen making machine, wherein the concentration of the nitrogen is 85-99%, and the flow rate is 15-40 cubic meters per minute;
step three: the high-purity nitrogen generated by the nitrogen making machine enters a compressor unit for further compression, the pressure of the nitrogen is improved, a piston compressor is driven by a diesel engine to work for further compression of the nitrogen, the diesel engine can also be connected with a speed reducer, the speed reducer drives the piston compressor to work for further compression of the nitrogen, the flow of the nitrogen output by the piston compressor is 15-40 cubic meters per minute, and the gas pressure is 35-50 Mpa;
step four: nitrogen compressed by the piston compressor enters the main gas pipeline through an output pipeline, a plurality of dry gas fracturing machines are started to work simultaneously according to oil wells with different specifications, the main gas pipeline is connected through the output pipelines connected with the dry gas fracturing machines, and each group of output pipelines is provided with a pressure gauge, a flow meter and a one-way valve;
step five: the pressure of the output gas of the dry gas fracturing machine is 30-50MPa, the output gas enters a main gas pipeline through an output pipeline, a second control valve k2 arranged on a first pipeline is opened, meanwhile, a first control valve k1 on a second pipeline is closed, the high-pressure gas is output through the first pipeline and connected with a main pipeline, and the main pipeline is directly connected with an oil well pipeline; the high-pressure gas generates a suppressed high pressure in the oil well, when the pressure of the gas suppressed underground reaches a set value, the second control valve k2 is closed, the first control valve k1 is opened, the high-pressure gas enters the second pipeline, the gas pressure and the loading rate are further improved through the pressurizing device, the high-pressure gas discharged from the pressurizing device enters the proppant mixer, the fracture proppant in the proppant mixer is led into the oil well along with the high-pressure gas, and the whole process of dry gas fracturing operation is completed.
The invention has the beneficial effects that: the invention utilizes the advantage of high nitrogen content in the air, adopts a mode of in-situ nitrogen preparation, takes high-pressure nitrogen gas as a power source, injects compressed high-energy gas into a stratum to be fractured, and leads the rock of an oil-gas reservoir to be fractured to generate cracks by means of a high-pressure gas source suppressed at the bottom of a well, and simultaneously leads the high-pressure gas to carry a crack propping agent to enter the cracks and stay in the cracks permanently, and the propping cracks are in an open state, thus improving the oil-gas flow environment; the oil or gas which cannot be produced originally can be produced in large quantity, and the oil well with low oil gas yield can greatly improve the yield; the system does not use water as a medium, saves a large amount of water resources and transportation cost, does not pollute underground water sources, does not have a water return link, does not need to carry out treatment and transportation of water return, and greatly saves the cost of fracturing; the high-pressure nitrogen fracturing is efficient, rapid and safe, and is a high-efficiency fracturing system with no environmental pollution and huge potential.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a high-efficiency dry gas fracturing machine system of the present invention;
FIG. 2 is a schematic diagram of a compressor set in a high-efficiency dry gas fracturing machine system according to the present invention;
FIG. 3 is a schematic diagram of another configuration of a compressor train in a high efficiency dry gas frac system according to the present invention;
FIG. 4 is a schematic structural diagram of a pressurizing device in the high-efficiency dry gas fracturing machine system according to the present invention;
in the figure: 1. an air filter; 2. a screw compressor; 3. a dryer; 4. a nitrogen making machine; 5. a compressor unit; 51. a diesel engine; 52. a speed reducer; 53. a piston compressor; 6. an output pipe; 7. a main gas conduit; 71. a first pipeline; 72. a second pipeline; k1, a first control valve; k2, a second control valve; 8. a pressure boosting device; 9. a proppant mixer; 10. a frac machine system controller; 11. an electric generator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a high efficiency dry gas frac system includes a dry gas frac, an output pipeline 6, a main gas pipeline 7, and a frac system controller 10; the dry gas fracturing machine is provided with a plurality of groups in parallel, the output ends of the dry gas fracturing machines are connected with output pipelines 6, the dry gas fracturing machines are connected with a main gas pipeline 7 in parallel through the output pipelines 6, the fracturing machine system controller 10 is used for regulating and controlling the high-efficiency dry gas fracturing machine system, and the gas outlet of the main gas pipeline 7 is connected with an oil well pipeline; the dry gas fracturing machines which are arranged in parallel are used for pressurizing gas and outputting high-pressure gas, and the high-pressure gas enters a main gas pipeline 7 through an output pipeline 6 and is directly connected to an oil well pipeline through the main gas pipeline 7. High-pressure gas is injected into the oil well, and the whole set of dry gas fracturing machine is arranged on a transport vehicle and is convenient to move.
The gas is nitrogen, and the concentration of the nitrogen is 85-99%.
The dry gas fracturing machine comprises an air filter 1, a screw compressor 2, a dryer 3, a nitrogen making machine 4, a compressor unit 5, a generator 11, a pressure gauge, a flow meter and a one-way valve, wherein an air outlet end of the air filter 1 is communicated with an air inlet end of the screw compressor 2 through a pipeline, an air outlet end of the screw compressor 2 is communicated with an air inlet end of the dryer 3 through a pipeline, an air outlet end of the dryer 3 is communicated with an air inlet end of the nitrogen making machine 4 through a pipeline, an air outlet end of the nitrogen making machine 4 is communicated with an air inlet end of the compressor unit 5, an air outlet end of the compressor unit 5 is connected with an output pipeline 6, the pressure gauge, the flow meter and the one-way valve are sequentially installed on the output pipeline 6, and the pressure gauge is.
The compressor unit 5 comprises a diesel engine 51 and a piston compressor 53, wherein the diesel engine 51 is a diesel engine, a double output shaft is arranged on the diesel engine 51, one end of the double output shaft is connected with the screw compressor 2 to preliminarily compress gas, the other end of the double output shaft is connected with the piston compressor 53 to secondarily compress the gas, and the gas pressure output by the compressor unit 5 is 30-50 MPa.
A speed reducer 52 can also be arranged between the diesel engine 51 and the piston compressor 53, and the speed reducer 52 is respectively connected with the diesel engine 51 and the piston compressor 53.
The main gas pipeline 7 comprises a first pipeline 71 and a second pipeline 72, the output of the first pipeline 71 is connected with the main pipeline 7, and the main pipeline 7 is directly connected with the oil well pipeline. And a second control valve K2 is installed on the first pipeline 71, a supercharging device 8 and a proppant mixer 9 are arranged on the second pipeline 72, a first control valve K1 is installed at the inlet of the supercharging device 8, the outlet of the supercharging device 8 is communicated with the inlet of the proppant mixer 9, a one-way stop valve is installed at the outlet of the proppant mixer 9, and the outlet of the one-way stop valve is communicated with the main pipeline 7.
The pressurizing device 8 is a plunger type compressor and is formed by connecting a plurality of plunger type compression molding machines in parallel, and a fracturing machine system controller 10 regulates and controls the number and time of opening and closing the plunger type compressor according to the required pressure, loading rate and flow.
The proppant mixer 9 is a closed container, a crack proppant is filled in the proppant mixer 9, and the crack proppant is a quartz sand or ceramsite particle proppant.
The fracturing machine system controller 10 is provided with a storage unit and a transmission unit, the storage unit stores fracturing big data, and the transmission unit remotely transmits the fracturing data.
The work flow of the high-efficiency dry gas fracturing machine system specifically comprises the following steps:
the method comprises the following steps: air is filtered by the air filter 1 and enters the screw compressor 2 for primary compression, the screw compressor 2 is driven by the diesel engine 51, the rotating speed is 1000-1500 r/min, the gas pressure after the compression of the screw compressor 2 reaches 1.0-2.5 Mpa, and the flow is 15-40 cubic meters/min;
step two: the air compressed by the screw compressor 2 enters the dryer 3 for drying and dehydration, the air after drying and dehydration enters the nitrogen making machine 4, the air is prepared into high-purity nitrogen through the nitrogen making machine 4, the concentration of the nitrogen is 85-99%, and the flow rate is 15-40 cubic meters per minute;
step three: the high-purity nitrogen generated by the nitrogen generator 4 enters the compressor unit 5 for further compression, the pressure of the nitrogen is improved, the diesel engine 51 drives the speed reducer 52 and the piston compressor 53 to work to further compress the nitrogen, the speed reducer 52 can also be arranged between the diesel engine 51 and the piston compressor 53, the flow of the nitrogen output by the piston compressor 53 is 15-40 cubic meters per minute, and the gas pressure is 35-50 Mpa;
step four: nitrogen compressed by the piston compressor 53 enters the main gas pipeline 7 through the output pipeline 6, a plurality of dry gas fracturing machines are started to work simultaneously according to oil wells with different specifications, the output pipelines 6 connected with the plurality of dry gas fracturing machines are connected with the main gas pipeline 7, and a pressure gauge, a flow meter and a one-way valve are arranged on each group of output pipelines 6;
step five: the pressure of the output gas of the dry gas fracturing machine is 30-50MPa, the output gas enters the main gas pipeline 7 through the output pipeline 6, the second control valve K2 arranged on the first pipeline 71 is opened, meanwhile, the first control valve K1 on the second pipeline 72 is closed, the high-pressure gas is output through the first pipeline 71 and is connected with the main pipeline 7, and the main pipeline 7 is directly connected with an oil well pipeline. The high-pressure gas generates a suppressed high pressure in the oil well, when the pressure of the gas suppressed underground reaches a set value, the second control valve K2 is closed, the first control valve K1 is opened, the high-pressure gas enters the second pipeline 72, the gas pressure and the loading rate are further improved through the supercharging device 8, the high-pressure gas discharged from the supercharging device 8 enters the proppant mixer 9, the fracture proppant in the proppant mixer 9 is led into the oil well along with the high-pressure gas, and the whole process of dry gas fracturing is completed.
When the high-efficiency dry gas fracturing machine system is used, high-pressure nitrogen is used as a power source to break the rock stratum of the oil well, so that the oil gas yield is improved and increased; air is filtered by the air filter 1 and enters the screw compressor 2 for primary compression, the screw compressor 2 is driven by the diesel engine 51, the rotating speed is 1000-1500 rpm, the gas pressure after the compression of the screw compressor 2 reaches 1.0-2.5 Mpa, and the flow is 15-40 cubic meters per minute;
in order to improve the safety of an oil well, the fracturing gas is required not to cause explosion, the selected fracturing gas is nitrogen, and an on-site nitrogen preparation device is implemented for reducing transportation; the gas after primary compression enters a nitrogen making machine 4 after passing through a dryer 3, the dryer 3 is a freeze-drying machine (the dryer 3 can be removed under some conditions, but the service cycle of the nitrogen making machine can be influenced), and the temperature of the freeze-drying machine is generally-2 ℃ to-5 ℃; the nitrogen generator 4 generates high-purity nitrogen, the purity of the nitrogen is determined according to the requirements of an oil well, when the purity of the nitrogen is below 95%, the nitrogen generator is configured into a membrane nitrogen generator, when the purity of the nitrogen is 95-99%, the nitrogen generator is configured into a double-tower adsorption nitrogen generator, and the flow rate of the nitrogen generator is 15-40 cubic meters per minute;
the high purity nitrogen gas produced by the nitrogen generator 4 enters the compressor unit 5 for further compression, the nitrogen gas pressure is increased, and the compressor unit 5 is driven by the diesel engine 51. Two ends of the diesel engine 51 are provided with shafts, one end is connected with the screw compressor 2, and the other end is connected with the piston compressor 53; the nitrogen flow output by the piston compressor 53 is 15-40 cubic meters per minute, the gas pressure is 35-50 Mpa, and the nitrogen enters a main gas pipeline 7 of the system through a gas pipeline 6; according to different oil wells, a plurality of compressor units 5 can work simultaneously to achieve the effect of fracturing rock stratum, so that output pipelines 6 of a plurality of compressors are connected in parallel on a main gas pipeline 7 of the system, and each output pipeline 6 is provided with an independent one-way valve, a flow meter and a pressure meter;
in order to ensure the safety of a fracturing oil well and improve the fracturing efficiency, a gas pressurizing device 8 is designed in a fracturing system, the gas pressurizing device is formed by connecting a plurality of plunger compressors in parallel, the gas pressure can reach 50-100 Mpa, and the requirement of rock stratum fracturing of the oil well is met; the proppant mixer 9 is a closed container and is loaded with solid particles for supporting cracks, and the solid particles for supporting cracks can be high-strength and high-permeability granular objects with good permeability such as quartz sand and ceramsite proppant. When high-pressure nitrogen is injected, the high-pressure nitrogen is suspended in the high-pressure nitrogen, is pressed into a well along with gas and enters a rock stratum fracture, and a support fracture is in an open state to improve a flow channel of oil gas;
the starting and stopping time of the gas supercharging device 8 and the number of the plunger compressors which are started and stopped are controlled and scheduled by a fracturing machine system controller 10 of the high-efficiency dry gas fracturing machine system according to the numerical value of the oil well suppressed pressure, the loading rate and the structures of different oil well rock stratums; the starting and stopping of the compressor sets 5 and the number of the compressors for starting and stopping are controlled and scheduled by a fracturing machine system controller 10 of the high-efficiency dry gas fracturing machine system according to the numerical value of the set pressure of the oil well and the structures of rock strata of different oil wells;
the pressure of the output gas of the dry gas fracturing machine is 30-50Mpa, and the output pipelines 6 are all connected in parallel on the main gas pipeline 7; the main gas pipeline 7 is divided into a first pipeline 71 and a second pipeline 72, the output of the first pipeline 71 is connected with the main pipeline 7, the main pipeline 7 is directly connected with an oil well pipeline, a supercharging device 8 and a proppant mixer 9 are arranged on the second pipeline 72, and the output of the second pipeline is connected with the main gas pipeline 7; a control valve K1 is arranged at the inlet of the pressurizing device 8, and a one-way stop valve is arranged at the outlet of the fracture proppant mixer 9; a second control valve K2 and a one-way stop valve are arranged on the pipeline 71 between the input pipeline of the pressurizing device 8 and the output pipeline of the fracture proppant mixer 9; the first control valve K1 and the second control valve K2 are controlled to be interlocked, when the supercharging device 8 is started, the first control valve K1 is opened, the second control valve K2 is closed, when the supercharging device 8 is closed, the second control valve K2 is opened, and the first control valve K1 is closed;
the high-efficiency dry gas fracturing machine system is uniformly regulated and controlled by a fracturing machine system controller 10, and the number and time of the open-up machines, the open-up time of a supercharging device, the number of open-up machines of a plunger compressor, the time and proportion of the entering of a fracture propping agent into a well, the protection of a fracturing system, the storage and remote transmission of all fracturing big data are scheduled according to the depth of an oil well, the underground geological structure, the rock stratum structure of an oil storage gas layer, the collected pressure, flow, temperature and other parameters; in order to meet the operation requirement of the whole fracturing machine, each fracturing machine is randomly allocated with a diesel generator 11 with the power of 100kw, and electric energy is provided for the cooling fan motor, the water pump motor and the oil pump motor of the whole set as well as emergency maintenance and illumination.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A high-efficiency dry gas fracturing machine system is characterized by comprising a dry gas fracturing machine, an output pipeline (6), a main gas pipeline (7) and a fracturing machine system controller (10); the dry gas fracturing machine is provided with a plurality of groups in parallel, the output ends of the dry gas fracturing machines are connected with output pipelines (6), the dry gas fracturing machines are communicated with a main gas pipeline (7) through the output pipelines (6), a fracturing machine system controller (10) is used for regulating and controlling a high-efficiency dry gas fracturing machine system, and the output of the main gas pipeline (7) is connected with an oil well pipeline; the dry gas fracturing machines which are arranged in parallel are used for pressurizing gas and outputting high-pressure gas, the high-pressure gas enters a main gas pipeline (7) through an output pipeline (6), and the high-pressure gas is injected into an oil well pipeline through the main gas pipeline (7).
2. The efficient dry gas fracturing machine system of claim 1, wherein the gas is nitrogen, and the concentration of the nitrogen is 85% -99%.
3. The efficient dry gas fracturing machine system according to claim 1, wherein the dry gas fracturing machine comprises an air filter (1), a screw compressor (2), a dryer (3), a nitrogen making machine (4), a compressor unit (5), a generator (11), a pressure gauge, a flow meter and a one-way valve, the air outlet end of the air filter (1) is communicated with the air inlet end of the screw compressor (2) through a pipeline, the air outlet end of the screw compressor (2) is communicated with the air inlet end of the dryer (3) through a pipeline, the air outlet end of the dryer (3) is communicated with the air inlet end of the nitrogen making machine (4) through a pipeline, the air outlet end of the nitrogen making machine (4) is communicated with the air inlet end of the compressor unit (5), the air outlet end of the compressor unit (5) is connected with an output pipeline (6), and the pressure gauge, the pressure gauge and the flow meter are sequentially installed on the output pipeline (6), The flowmeter and the one-way valve, the manometer is located near one side of the compressor unit (5).
4. The efficient dry gas fracturing machine system according to claim 3, wherein the compressor set (5) comprises a diesel engine (51) and a piston compressor (53), the diesel engine (51) is a diesel engine, the diesel engine (51) is provided with double output shafts, one ends of the double output shafts are connected with the screw compressor (2) to perform primary compression on gas, the other ends of the double output shafts are connected with the piston compressor (53) to perform secondary compression on gas, and the pressure of the gas output by the compressor set (5) is 30-50 MPa.
5. The efficient dry gas fracturing machine system according to claim 4, wherein a speed reducer (52) is arranged between the diesel engine (51) and the piston compressor (53), and the speed reducer (52) is respectively connected with the diesel engine (51) and the piston compressor (53).
6. The efficient dry gas fracturing machine system of claim 1, wherein the main gas pipeline (7) comprises a first pipeline (71) and a second pipeline (72), the first pipeline (71) is connected with the main pipeline (7) in an output mode, the main pipeline (7) is directly connected to an oil well pipeline, a second control valve (K2) is installed on the first pipeline (71), a pressurizing device (8) and a proppant mixer (9) are arranged on the second pipeline (72), a first control valve (K1) is installed at an inlet of the pressurizing device (8), an outlet of the pressurizing device (8) is communicated with an inlet of the proppant mixer (9), a one-way stop valve is installed at an outlet of the proppant mixer (9), and an outlet of the one-way stop valve is communicated with the main pipeline (7).
7. The high-efficiency dry gas fracturing machine system according to claim 6, wherein the pressurizing device (8) is a plunger compressor and consists of a plurality of plunger type compression molding machines connected in parallel, and the fracturing machine system controller (10) controls the number and time of opening and closing the plunger type compressor according to the required pressure, loading rate and flow.
8. The efficient dry gas fracturing machine system of claim 6, wherein the proppant mixer (9) is a closed container, the proppant mixer (9) contains a fracture proppant, and the fracture proppant is a quartz sand or ceramsite particle proppant.
9. The efficient dry gas fracturing machine system of claim 1, wherein the fracturing machine system controller (10) is provided with a storage unit and a transmission unit, the storage unit stores fracturing big data, and the transmission unit remotely transmits the fracturing data.
10. The efficient dry gas fracturing machine system of claim 1, wherein the workflow of the efficient dry gas fracturing machine system specifically comprises the following steps:
the method comprises the following steps: after being filtered by the air filter (1), the air enters the screw compressor (2) for primary compression, the screw compressor (2) is driven by a diesel engine (51), the rotating speed is 1000-1500 r/min, the gas pressure after being compressed by the screw compressor (2) reaches 1.0-2.5 Mpa, and the flow rate is 15-40 cubic meters/min;
step two: air compressed by the screw compressor (2) enters the dryer (3) for drying and dehydration, the air after drying and dehydration enters the nitrogen making machine (4), the air is prepared into high-purity nitrogen through the nitrogen making machine (4), the concentration of the nitrogen is 85-99%, and the flow is 15-40 cubic meters per minute;
step three: high-purity nitrogen generated by the nitrogen generator (4) enters a compressor unit (5) for further compression, the pressure of the nitrogen is increased, a piston compressor (53) is driven by a diesel engine (51) to work for further compression, the flow of the nitrogen output by the piston compressor (53) is 15-40 cubic meters per minute, and the gas pressure is 35-50 Mpa;
step four: nitrogen compressed by the piston compressor (53) enters the main gas pipeline (7) through the output pipeline (6), a plurality of dry gas fracturing machines are started to work simultaneously according to oil wells of different specifications, the output pipelines (6) connected with the dry gas fracturing machines are connected in parallel and then connected with the main gas pipeline (7), and a pressure gauge, a flow meter and a one-way valve are arranged on each group of output pipelines (6);
step five: the pressure of the gas output by the dry gas fracturing machine is 30-50MPa, the gas enters a main gas pipeline (7) through an output pipeline (6), a second control valve (K2) arranged on a first pipeline (71) is opened, meanwhile, a first control valve (K1) on a second pipeline (72) is closed, the high-pressure gas is output through the first pipeline (71) and connected with the main pipeline (7), the main pipeline (7) is connected to an oil well pipeline, the high-pressure gas generates a suppressed high pressure in an oil well, when the pressure of the gas suppressed underground reaches a set value, the second control valve (K2) is closed and a first control valve (K1) is opened, the high-pressure gas enters the second pipeline (72), the gas pressure and the loading rate are further improved through a pressurizing device (8), the high-pressure gas discharged from the pressurizing device (8) enters a propping agent mixer (9), and the crack propping agent in the propping agent mixer (9) is introduced into the oil well pipeline along with the high-pressure gas, and finishing the whole process of the dry gas fracturing operation.
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| US20070000666A1 (en) * | 2004-12-23 | 2007-01-04 | Charles Vozniak | Method and system for fracturing subterranean formations with a proppant and dry gas |
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