CN113185956B - Application of natural gas condensate as circulating medium - Google Patents
Application of natural gas condensate as circulating medium Download PDFInfo
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- CN113185956B CN113185956B CN202010037105.XA CN202010037105A CN113185956B CN 113185956 B CN113185956 B CN 113185956B CN 202010037105 A CN202010037105 A CN 202010037105A CN 113185956 B CN113185956 B CN 113185956B
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- 239000003498 natural gas condensate Substances 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims description 66
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 33
- 238000005553 drilling Methods 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 22
- 238000005057 refrigeration Methods 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 15
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000001273 butane Substances 0.000 claims description 7
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 7
- 239000001294 propane Substances 0.000 claims description 7
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000003345 natural gas Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QXJJQWWVWRCVQT-UHFFFAOYSA-K calcium;sodium;phosphate Chemical compound [Na+].[Ca+2].[O-]P([O-])([O-])=O QXJJQWWVWRCVQT-UHFFFAOYSA-K 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/34—Organic liquids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an application of natural gas condensate as a circulating medium. According to different underground conditions, ground and underground temperature changes and construction purposes, natural gas condensate with proper components is selected as a circulating medium, the natural energy of underground and ground is fully utilized, the mutual conversion of the natural gas condensate between liquid and gas is promoted, the purpose of reducing bottom hole pressure is achieved, construction equipment is simpler, and energy consumption is lower; meanwhile, the construction safety is ensured through the design of a sealing process, and the influence on the environment and the human health is the lowest.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration and development. And more particularly to the use of natural gas condensate as a circulating medium.
Background
At present, the formation pressure of many oil and gas fields has been reduced below the fresh water column pressure, i.e. the equivalent mud density of 1.00, and even in some areas has been reduced to 0.51, that is, even when the most commonly used diesel oil (density of 0.84) is used as the circulating medium, leakage may occur, material consumption is increased, and the formation is polluted. Thus, the petroleum and natural gas industry has increasingly adopted gas to replace liquid circulation media since the nineties of the last century, but because of the large volume of gas, it is necessary to equip large compression equipment and a thick wellbore string, the investment in well construction and the operating costs are very expensive, and because of the great compressibility of the gas circulation media, the downhole motor operation is very unstable and cannot be used for drilling directional and horizontal well operations, which is a fatal weakness of gas as circulation media. Density reducing materials, hollow glass spheres, etc. are also being used to reduce the density of the circulating medium, but their density ranges are narrow and the effect of reducing the density of the gas cannot be achieved; and, they have high abrasiveness, which limits their use.
Accordingly, the present invention provides an application of natural gas condensate as a circulating medium to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide an application of natural gas condensate (NGL for short) as a circulating medium.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an application of natural gas condensate as a circulating medium.
Preferably, the circulating medium is a circulating medium for wellbore operations.
Preferably, the wellbore operations include one or more of drilling, completion, workover, and gas lift.
Preferably, the natural gas condensate comprises one or more of ethane, propane, butane and pentane; wherein the densities of ethane, propane, butane and pentane relative to the clear water are 0.45, 0.50, 0.58 and 0.63, respectively. Natural gas condensate, also known as natural gas liquids or natural gas liquids, is conventionally known as light hydrocarbons, and is a mixture of liquid hydrocarbons recovered from natural gas, including hydrocarbons such as ethane, propane, butane, and pentane; NGLs can be further separated from ethane, propane, butane, pentane, where mixtures of propane and butane are commonly used liquefied gas (LPG) and natural gasoline (also known as condensate).
Preferably, the critical temperature range of the natural gas condensate is 32.2-196.6 ℃; above these temperatures, the natural gas condensate can only be in a gaseous state and will not become liquid even at high pressures.
Preferably, the critical pressure range of the natural gas condensate is 3.37MPa to 4.87MPa; the critical pressure range is the pressure range in which gas-liquid conversion occurs in the natural gas condensate in the critical temperature range, and belongs to the medium pressure level; in fact, in some wells, the natural temperature in the well has reached 200 ℃, if this temperature is not reached, the downhole warming can be adopted to promote the vaporization of the condensate, thus reducing the pressure of the circulating medium on the bottom of the well and ensuring the effect of underbalanced drilling, completion, workover and gas lift operations.
Preferably, the boiling point range of the natural gas condensate is-88.6-36.1 ℃; below this boiling point range temperature, the natural gas condensate may be in a liquid state; the condensing temperatures of propane, butane and pentane are high, namely-42.1 ℃, 0.5 ℃ below zero and 36.1 ℃ respectively, and the liquid can be condensed out without deep cooling and compression of natural gas in winter in the North Pole.
As another aspect of the present invention, the present invention also provides a circulation system for wellbore operations using the above-described natural gas condensate, comprising a wellbore, a sealed storage device, a power device, a drilling tool, a separation device, and a refrigeration and compression device; wherein,,
the natural gas condensate serving as a circulating medium is stored in the sealed storage device;
the power device is connected with the sealed storage device and is used for conveying the circulating medium in the sealed storage device to the shaft;
the top of the drilling tool is connected with a power device, and the bottom of the drilling tool extends downwards into a shaft;
the separation device is connected with the shaft and is used for carrying out gas-liquid-solid separation on the circulating medium returned from the shaft and input into the separation device, the separated gas enters the refrigeration and compression device, and the separated liquid enters the sealed storage device;
the refrigerating and compressing device is connected with the sealed storage device and is used for cooling and compressing the gas entering the refrigerating and compressing device to form liquid, and the formed liquid enters the sealed storage device.
Preferably, the circulation system further comprises a heating device provided in the wellbore for heating the circulation medium.
Preferably, the power device is connected with the drilling tool through a high-pressure pipeline, a vertical pipe and a water hose in sequence. It should be understood by those skilled in the art that the high pressure pipeline is a conventional high pressure pipeline, and will not be described herein.
Preferably, the well bore is connected to the separation device by an outflow pipe for conveying the circulating medium returned from the well bore to the separation device; the two ends of the outflow pipe are respectively connected with the upper part of the shaft and the upper part of the separation device, and the connection part of the outflow pipe and the shaft is higher than the connection part of the outflow pipe and the separation device. The downwardly sloping outflow pipe of the invention removes most of the gas from the circulating medium from liquids and solids.
Preferably, the circulation system further comprises a vibrating screen provided between the separation device and the sealed storage device for further separation of liquid and solids; the top of the sealed storage device is provided with a one-way inlet, an outlet of the one-way inlet is arranged at the lower part of the sealed storage device, and liquid separated by the vibrating screen enters the sealed storage device through the one-way inlet at the top of the sealed storage device; the outlet of the unidirectional inlet is arranged at the lower part of the sealed storage device and is submerged below the liquid surface, and gas and liquid can only enter and cannot return.
Preferably, the bottom of the separation device is connected with a spiral cylinder, and an outlet of the spiral cylinder is arranged above the vibrating screen and is used for conveying the solids separated by the separation device to the vibrating screen for further solid-liquid separation.
Preferably, the bottom of the separating device is also provided with a base for receiving the sinking solids in the separating device.
Preferably, the separation device is connected with a discharge pipe, and an outlet of the discharge pipe is arranged above the vibrating screen and is used for conveying the liquid separated by the separation device to the vibrating screen for further solid-liquid separation.
Preferably, the outlet of the discharge pipe is at a height below the bottom position of the gas in the separation device, so that the escape of gas is prevented.
Preferably, the separation device is connected to the refrigeration and compression device through a discharge line for delivering the gas separated by the separation device to the refrigeration and compression device; wherein, the both ends of exhaust line are connected respectively the top of separator and the top of refrigeration and compression device.
Preferably, the refrigerating and compressing device is connected to the sealed storage device through a liquid line for delivering the liquid compressed by the refrigerating and compressing device to the sealed storage device.
Preferably, an air suction pipe is further arranged between the refrigeration and compression device and the sealed storage device, and the air suction pipe is used for sucking the air in the sealed storage device to the refrigeration and compression device on one hand, and repeatedly cooling and compressing the air to maintain the temperature and the pressure in the sealed storage device not to rise above the atmospheric pressure; on the other hand, to maintain the pressure in the sealed storage device below atmospheric pressure, thereby ensuring that the circulation system will only draw in and not escape gas once the seal in place fails. In practical application, the lower limit and the upper limit of the explosion of the light hydrocarbon gas in the range from methane to pentane are 1.5% and 16%, the alkane gas in the range is easy to be contained in the air, and more than 84% of the air is required to be inhaled into the alkane gas in the sealed storage device, so that the sealed storage device is easy to detect and takes fireproof and explosion-proof measures.
Preferably, a wellhead gate is arranged at the top of the shaft; to prevent the vaporized circulating medium from volatilizing into the atmosphere, the well bore is fitted with a wellhead choke, which is typically performed on the drilling site using rotary blowout prevention.
Preferably, the separation device is a submerged separator.
Preferably, a drill bit is arranged at the bottom of the drilling tool.
Preferably, the sealed storage device is a sealed mud tank.
Preferably, the power device is a mud pump.
Preferably, the heating device is a heater.
Preferably, the refrigeration and compression device is a refrigeration and compressor.
As another aspect of the present invention, the present invention also provides a circulation method for wellbore operations using the circulation system described above, including the steps of:
natural gas condensate in the sealed storage device is input into a shaft through a drilling tool by a power device; the circulating medium returned from the shaft enters a separating device for gas-liquid-solid separation, the separated gas enters a refrigerating and compressing device, and the separated liquid enters a sealed storage device to participate in the next cycle; the refrigerating and compressing device is used for refrigerating and compressing the gas separated by the separating device and/or the volatilized gas in the sealed storage device to obtain liquid, and the liquid enters the sealed storage device to participate in the next cycle.
Preferably, the recycling method specifically comprises the following steps:
natural gas condensate in the sealed storage device is input into a shaft through a drilling tool by a power device;
the circulating medium returned from the shaft enters a separation device through a outflow pipe to carry out gas-liquid-solid separation;
conveying the solid separated by the separating device to a vibrating screen through a spiral cylinder;
the liquid separated by the separating device is conveyed to a vibrating screen through a discharge pipe;
the gas separated by the separation device is conveyed to the refrigeration and compression device through the exhaust pipeline;
the volatilized gas in the sealed storage device is sucked into the refrigerating and compressing device through the suction pipe;
solid and liquid entering the vibrating screen are subjected to solid-liquid separation, the liquid obtained by the separation of the vibrating screen is injected into the sealed storage device through the one-way inlet for recycling, and the solid obtained by the separation of the vibrating screen is discharged out of the circulating system;
the gas entering the refrigerating and compressing device is cooled and compressed to form liquid, and the liquid flows into the sealed storage device through the liquid pipeline to participate in the next round of circulation.
The beneficial effects of the invention are as follows:
according to different underground conditions, ground and underground temperature changes and construction purposes, natural gas condensate with proper components is selected as a circulating medium, the natural energy of underground and ground is fully utilized, the mutual conversion of NGL between liquid and gas is promoted, the purpose of reducing bottom hole pressure is achieved, the maximum reduction value can reach the value of the used liquid, construction equipment is simpler, and energy consumption is lower; meanwhile, the construction safety is ensured through the design of a sealing process, and the influence on the environment and the human health is the lowest.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 shows a schematic diagram of a circulation system provided by the present invention;
the device comprises a 1-power device, a 2-high-pressure pipeline, a 3-heating device, a 4-vertical pipe, a 5-shaft, a 6-wellhead gate, a 7-water hose, an 8-drilling tool, a 9-outflow pipe, a 10-exhaust pipeline, an 11-separating device, a 12-base, a 13-refrigerating and compressing device, a 14-liquid pipeline, a 15-sealed storage device, a 16-air suction pipe, a 17-vibrating screen, an 18-discharge pipe, a 19-spiral cylinder, a 20-unidirectional inlet and a 21-drill bit.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Example 1
The embodiment provides a circulation system for shaft operation, which comprises a shaft 5, a heating device 3, a sealed storage device 15, a power device 1, a drilling tool 8, a separation device 11, a vibrating screen 17 and a refrigerating and compressing device 13, as shown in fig. 1; wherein,,
the sealed storage device 15 stores natural gas condensate;
the power device 1 is used for conveying natural gas condensate in the sealed storage device 15 to the shaft 5, and the power device 1 is connected with the drilling tool 8 through the high-pressure pipeline 2, the vertical pipe 4 and the hose 7 in sequence; the top of the drilling tool 8 is connected with the power device 1, and the bottom of the drilling tool 8 extends downwards into the shaft 5; the bottom of the drilling tool 8 is provided with a drill bit 21;
the shaft 5 is connected with the separation device 11 through an outflow pipe 9, and the outflow pipe 9 is used for conveying natural gas condensate returned from the shaft 5 to the separation device 11, and the natural gas condensate is subjected to gas-liquid-solid separation in the separation device 11; wherein, two ends of the outflow pipe 9 are respectively connected with the upper part of the shaft 5 and the upper part of the separation device 11, and the connection part of the outflow pipe 9 and the shaft 5 is higher than the connection part of the outflow pipe 9 and the separation device 11; the top of the shaft 5 is provided with a wellhead gate 6; the heating device 3 is arranged in the shaft 5 and is used for heating natural gas condensate;
the separation device 11 is connected to the refrigerating and compressing device 13 through a discharge line 10, and the discharge line 10 is used for conveying the gas separated by the separation device 11 to the refrigerating and compressing device 13; wherein, two ends of the exhaust pipeline 10 are respectively connected with the top of the separation device 11 and the top of the refrigeration and compression device 13;
the bottom of the separation device 11 is connected with a spiral cylinder 19, and an outlet of the spiral cylinder 19 is arranged above the vibrating screen 17 and is used for conveying the solids separated by the separation device 11 to the vibrating screen 17 for further solid-liquid separation; the bottom of the separation device 11 is also provided with a base 12 for receiving the sunk solids in the separation device 11;
the separation device 11 is connected with a discharge pipe 18, and an outlet of the discharge pipe 18 is arranged above the vibrating screen 17 and is used for conveying the liquid separated by the separation device 11 to the vibrating screen 17 for further solid-liquid separation; the outlet of the discharge pipe 18 is at a lower level than the bottom position of the gas in the separation device 11;
the top of the sealed storage device 15 is provided with a one-way inlet 20, an outlet of the one-way inlet 20 is arranged at the lower part of the sealed storage device 15, and liquid separated by the vibrating screen 17 enters the sealed storage device 15 through the one-way inlet 20 at the top of the sealed storage device 15;
the refrigerating and compressing device 13 is connected with the sealed storage device 15 through a liquid pipeline 14, and the liquid pipeline 14 is used for conveying the liquid compressed by the refrigerating and compressing device 13 to the sealed storage device 15;
a suction pipe 16 is further provided between the refrigerating and compressing device 13 and the sealed storage device 15, and the suction pipe 16 is used for sucking the gas in the sealed storage device 15 to the refrigerating and compressing device 13 and maintaining the pressure in the sealed storage device 15 below the atmospheric pressure.
Example 2
The embodiment provides a well drilling circulation method using the circulation system in embodiment 1, taking well drilling in a region with an average temperature below 36 ℃ as an example, wherein the separation device used in the embodiment is a submerged separator, the sealed storage device is a sealed mud tank, the power device is a mud pump, the heating device is a heater, and the refrigeration and compression device is a refrigeration and compressor; the method comprises the following steps:
1) Selecting pentane liquid of 30 cubic meters as a circulating medium, storing the pentane liquid in a sealed slurry tank, sucking and pressurizing the circulating medium by a slurry pump, and injecting the circulating medium into a shaft through a high-pressure pipeline, a vertical pipe, a water hose, a drilling tool and a drill bit; wherein, when the temperature near the drill bit does not reach the temperature for vaporizing the pentane liquid, the heater heats the pentane liquid to vaporize the pentane liquid, thereby reducing the density of the circulating medium; by means of these devices, the circulating medium containing gas, liquid and solids is controllably returned to the wellbore, completing a cycle;
2) The pressure of the circulating medium returned to the ground is reduced to be close to the normal atmospheric pressure, the gas expands, and the system is cooled because the expansion of the gas is an endothermic process; when the pressure is equal to the atmospheric pressure and the temperature is reduced by 36.1 ℃, pentane gas is separated out from the shaft, and the outflow pipe which is inclined downwards enters the submerged separator;
the circulating medium is further separated in the submerged separator; the solid separated by the submerged separator is sunk to the base part and is conveyed to the vibrating screen by the spiral cylinder; the liquid separated by the submerged separator falls below the submerged separator and is conveyed to a vibrating screen through a discharge pipe; the gas separated by the submerged separator is conveyed to a refrigerating and compressing machine through an exhaust pipeline;
part of volatile gas in the sealed mud tank is sucked into the refrigerating and compressing machine through the suction pipe;
the solid and the liquid entering the vibrating screen are subjected to further separation of the liquid and the solid, the liquid separated by the vibrating screen is injected into the sealed slurry tank through the one-way inlet for recycling, and the solid separated by the vibrating screen is discharged out of the circulating system;
the gas entering the refrigeration and compressor is cooled and compressed to form liquid, and the liquid flows into the sealed mud tank through a liquid pipeline to participate in the next cycle;
through the cyclic steps repeatedly, the requirement of petroleum drilling operation on reducing the density of a circulating medium is met.
Since the circulation process of the completion, workover and gas lift operations of the oil and gas production operation in actual production is similar to that of the well drilling in example 2, the description thereof will be omitted.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. A circulation system for wellbore operations, the circulation system comprising a wellbore, a sealed storage device, a power device, a drilling tool, a separation device, and a refrigeration and compression device; wherein,,
the sealed storage device is stored with natural gas condensate serving as a circulating medium;
the power device is connected with the sealed storage device and is used for conveying the circulating medium in the sealed storage device to the shaft;
the top of the drilling tool is connected with a power device, and the bottom of the drilling tool extends downwards into a shaft;
the separation device is connected with the shaft and is used for carrying out gas-liquid-solid separation on the circulating medium returned from the shaft and input into the separation device, the separated gas enters the refrigeration and compression device, and the separated liquid enters the sealed storage device;
the refrigerating and compressing device is connected with the sealed storage device and is used for cooling and compressing the gas entering the refrigerating and compressing device to form liquid, and the formed liquid enters the sealed storage device;
and an air suction pipe is arranged between the refrigerating and compressing device and the sealed storage device and is used for sucking the air in the sealed storage device to the refrigerating and compressing device and maintaining the pressure in the sealed storage device below the atmospheric pressure.
2. The circulation system for wellbore operations of claim 1, further comprising a heating device disposed within the wellbore.
3. The circulation system for wellbore operations of claim 1, wherein the wellbore is connected to the separation device by an outflow pipe for conveying circulating medium returned from the wellbore to the separation device; the two ends of the outflow pipe are respectively connected with the upper part of the shaft and the upper part of the separation device, and the connection part of the outflow pipe and the shaft is higher than the connection part of the outflow pipe and the separation device.
4. The circulation system for wellbore operations of claim 1, further comprising a vibrating screen disposed between the separation device and the sealed storage device for further separation of liquids and solids; the top of the sealed storage device is provided with a one-way inlet, an outlet of the one-way inlet is arranged at the lower part of the sealed storage device, and liquid separated by the vibrating screen enters the sealed storage device through the one-way inlet at the top of the sealed storage device;
the bottom of the separation device is connected with a spiral cylinder, and an outlet of the spiral cylinder is arranged above the vibrating screen and is used for conveying the solids separated by the separation device to the vibrating screen for further solid-liquid separation;
the separation device is connected with a discharge pipe, and an outlet of the discharge pipe is arranged above the vibrating screen and is used for conveying liquid separated by the separation device to the vibrating screen for further solid-liquid separation; the outlet of the discharge pipe is at a height below the bottom position of the gas in the separation device.
5. The circulation system for wellbore operations of claim 1, wherein a top of the wellbore is provided with a wellhead gate.
6. The circulation system for wellbore operations of claim 1, wherein the natural gas condensate has a critical temperature in the range of 32.2 ℃ to 196.6 ℃, a critical pressure in the range of 3.37MPa to 4.87MPa, and a boiling point in the range of-88.6 ℃ to 36.1 ℃.
7. The circulation system for wellbore operations of claim 1, wherein the natural gas condensate comprises one or more of ethane, propane, butane, and pentane.
8. A circulation method for wellbore operations, characterized in that it uses a circulation system according to any one of claims 1 to 7, comprising the steps of:
natural gas condensate in the sealed storage device is input into a shaft through a drilling tool by a power device; the circulating medium returned from the shaft enters a separating device for gas-liquid-solid separation, the separated gas enters a refrigerating and compressing device, and the separated liquid enters a sealed storage device to participate in the next cycle; the refrigerating and compressing device is used for refrigerating and compressing the gas separated by the separating device and/or the volatilized gas in the sealed storage device to obtain liquid, and the liquid enters the sealed storage device to participate in the next cycle.
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| CN201008761Y (en) * | 2007-02-02 | 2008-01-23 | 中国石油化工股份有限公司 | Gas-liquid-solid mixed phase flow separating device for stone oil project |
| CN102288007B (en) * | 2011-07-20 | 2013-06-19 | 西安长庆科技工程有限责任公司 | Natural-gas condensed-liquid recovery device and method using mixed light hydrocarbon as refrigerant |
| US20140174122A1 (en) * | 2012-11-01 | 2014-06-26 | Gary Cooper | Natural Gas Liquids Recovery Plant |
| CN107429181A (en) * | 2015-03-13 | 2017-12-01 | 约瑟夫·J.·弗尔克尔 | Transport of natural gas by dissolving in liquid hydrocarbons at ambient temperature |
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