CN113356805B - Inter-well agitation type gas lift induced flow device and gas lift induced flow method - Google Patents

Inter-well agitation type gas lift induced flow device and gas lift induced flow method Download PDF

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Publication number
CN113356805B
CN113356805B CN202110809562.0A CN202110809562A CN113356805B CN 113356805 B CN113356805 B CN 113356805B CN 202110809562 A CN202110809562 A CN 202110809562A CN 113356805 B CN113356805 B CN 113356805B
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well
gas
fault
liquid
oil pipe
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CN113356805A (en
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袁勋
李立民
刘洋
郭秩瑛
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Tianjin Branch
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Tianjin Branch
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/122Gas lift
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/02Valve arrangements for boreholes or wells in well heads
    • E21B34/04Valve arrangements for boreholes or wells in well heads in underwater well heads
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/01Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/18Repressuring or vacuum methods

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Abstract

A well-to-well agitation type gas lift induced flow device and a gas lift induced flow method are disclosed, wherein a small period and a high frequency open flow and close a well are carried out, and elevation mixed liquid is gradually formed, so that the pressure drop of a liquid column in a shaft is reduced, the production pressure difference is increased, formation oil gas is started to enter the shaft, and the self-flow of an oil well is recovered; the method comprises the following steps: firstly, the following steps: closing the production wing valve and the oil nozzle of the fault well, opening the production main valve and the wing valve of the fault well, and introducing high-pressure gas of an adjacent well into an oil pipe of the fault well; II, secondly: stewing; thirdly, the steps of: closing the adjacent well wing valve, and opening the fault well wing valve and the oil nozzle to enable gas and liquid in the well shaft of the fault well to move upwards; fourthly, the method comprises the following steps: closing the oil nozzle of the fault well, stopping the migration of the upper gas, and slowing the upward migration speed of the far-end gas; the liquid at the lower part moves upwards and invades into the gas at the upper part to form a gas-liquid mixed flow state; fifthly: repeating the above process to enlarge the gas-liquid mixed fluid liquid column and move to the ground; sixthly: and starting stratum oil gas to enter a shaft for induced flow, and performing self-flow and production recovery. The invention has low operation cost; is suitable for similar wells.

Description

Inter-well agitation type gas lift induced flow device and gas lift induced flow method
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to an interwell agitation type gas lift induced flow device and a gas lift induced flow method.
Background
At present, in the production process of a flowing well in an offshore oilfield, the energy of the stratum of the offshore oilfield is utilized to continuously lift stratum fluid to the ground, so that flowing production is realized. However, during the production process of the flowing well, the flowing well stop problem can be caused by insufficient formation productivity or bottom hole liquid accumulation after the well is shut down in the test operation.
The conventional common method for solving the problem of accumulated liquid blowout stop of the flowing well comprises the following steps: firstly, injecting an oil pipe by using a high-pressure air source of an adjacent well, and reducing the density of the oil pipe so as to reduce the flow backpressure and perform conventional open flow; however, the method is determined according to the energy level of the formation, the water content and the degree of the wellbore liquid accumulation, so the success rate is not high; secondly, induced spraying is carried out through coiled tubing operation, but the method has a long operation period, so that the operation cost is high.
Disclosure of Invention
The invention aims to provide an interwell agitation type gas lift induced flow device and a gas lift induced flow method, and aims to solve the technical problem of field liquid accumulation stopping of a self-blowing well.
In order to achieve the purpose, the specific technical scheme of the inter-well sloshing type gas lift induced-flow device and the gas lift induced-flow method is as follows:
an interwell agitation type gas lift induced-draft device, comprising: the system comprises a kill manifold arranged outside a shaft and a plurality of control devices connected with the kill manifold; wherein, the first way in the control device of counting is: is provided with: a plurality of adjacent well service oil pipe control valves are arranged on the pipeline, the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with an adjacent well service oil pipe control valve; and the control valve of the well-facing service oil pipe at one end is also connected with a fault well oil pressure gauge through a pipeline; the oil pipe control valve of the adjacent well service at the other end is also connected with the stepped pipeline through a pipeline; a second way of the digital control device: is provided with: a plurality of fault well service oil pipe control valves are arranged on the pipeline, the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve, a fault well production control valve and a fault well production main valve; the control valve of the service oil pipe of the fault well is connected with an oil pressure gauge of the fault well through a pipeline; the production control valve of the fault well is respectively connected with a choke of the fault well and a closed discharge tank through pipelines, and the closed discharge tank is connected with a torch head; and the main production valve of the fault well at the other end is also connected with the stepped pipeline through a pipeline.
Further, the control valve of the service oil pipe of the fault well is a wing valve of the service oil pipe of the fault well.
Further, the production control valve of the fault well is a production wing valve of the fault well.
Further, the main production valve of the fault well is a straight-through valve.
Furthermore, the shape of the closed-row tank is rectangular, and arc-shaped covers protruding outwards are arranged at two ends of the rectangle.
The invention also provides an interwell agitation type gas lift induced flow method, which is provided with the interwell agitation type gas lift induced flow device, wherein gas-liquid mixed fluid is generated by small-period high-frequency open flow-close of a well and gradually forms high-elevation mixed liquid by utilizing larger inertia difference between gas and liquid in a shaft, so that the pressure drop of a liquid column in the shaft is gradually reduced, the pressure difference is increased to a certain degree, and then formation oil gas is successfully started to enter the shaft, and the self-flow of an oil well is recovered;
the method comprises the following steps:
the first step is as follows: closing a production wing valve and a choke of the fault well, opening a production main valve and a service oil pipe wing valve of the fault well, then opening a service oil pipe wing valve of an adjacent well, and enabling high-pressure gas of the adjacent well to enter an oil pipe of the fault well through a killing manifold;
the second step is that: soaking the well to increase the compression amount of high-pressure gas and store power energy;
the third step: closing a service oil pipe wing valve of an adjacent well, opening a production wing valve of a fault well and a nozzle of the fault well, increasing production pressure difference, blowing in large-displacement instantaneous quantity, enabling gas and liquid in a well shaft of the fault well to move upwards at high flow rate, and recording the change condition of an oil pressure gauge of the fault well;
the fourth step: closing the oil nozzle of the fault well;
the fifth step: repeating the third step and the fourth step to enable the generated gas-liquid mixed fluid state liquid to be continuously enlarged and move upwards until the gas-liquid mixed fluid state liquid is lifted to the ground;
and a sixth step: and repeating the first step to the fifth step, continuously lifting the formed gas-liquid mixed flow state liquid column to the ground in a manner of surging among wells, realizing the staged flowback of the accumulated liquid in the shaft, finally realizing the success of induced spraying and the self-spraying and the reproduction.
Further, in the second step, the soaking time lasts for 2-3 hours.
Further, in the third step, the instantaneous discharge amount of the large discharge amount is: 8000 squares/hour, and for 1min.
Further, in the fourth step, the purpose of closing the oil nozzle of the fault well is to stop the upper gas from moving,
the far-end gas slows the upward migration speed under the action of inertia force and compressibility; and the liquid at the lower part continuously moves upwards at a high flow rate under the action of larger inertia force and continuously disperses and invades into the gas at the upper part to form gas-liquid mixed fluid.
Further, in the fifth step, after repeating the third step and the fourth step, and through 4-5 cycles, the generated gas-liquid mixed fluid state liquid is continuously enlarged and moved upwards until the gas-liquid mixed fluid state liquid is lifted to the ground.
The inter-well agitation type gas lift induced-flow device and the gas lift induced-flow method have the following advantages:
1. the invention has convenient operation, lower operation cost and shorter operation period;
2. the invention utilizes larger inertia difference between gas and liquid in the shaft, and opens and closes the well in a small period and high frequency, so as to generate gas-liquid mixed fluid and gradually form larger height mixed fluid, thereby gradually reducing the pressure drop of a shaft fluid column, increasing the production pressure difference to a certain degree, further successfully starting formation oil gas to enter the shaft, and recovering the self-injection of the oil well;
3. the invention is suitable for similar wells and solution treatment, and is popularized and used.
Drawings
FIG. 1 is a schematic representation of a wellbore flow regime change of the present invention;
FIG. 2 is a schematic view of the gas lift induced spray process of the present invention.
The symbols in the figure illustrate:
1. a kill manifold; 2. an oil pipe control valve for a temporary well service; 3. a fault well oil pressure gauge; 4. a failed well service tubing control valve; 5. a failed well production control valve; 6. a failed well choke; 7. a failed well production master valve; 8. closing the discharge tank; 9. flare tip, 10, gas in the wellbore; 11. gas-liquid mixed fluid in a shaft; 12. a fluid in the wellbore.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, a gas lift induced-jetting device and method of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 2, the present invention includes: a kill manifold 1 arranged outside the shaft, and a plurality of control devices (in this embodiment, the plurality of control devices are two paths) connected with the kill manifold 1; wherein, the first way in the number way controlling means: is provided with: the cross-shaped pipelines are provided with the well-facing service oil pipe control valves 2 respectively; and the well-facing service oil pipe control valve 2 at one end is also connected with a fault well oil pressure gauge through a pipeline; the oil pipe control valve 2 for near-well service at the other end is also connected with the stepped pipeline through a pipeline;
a second way of the digital control device: is provided with: a plurality of fault well service oil pipe control valves 4 are arranged on the pipeline, the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve 4, a fault well production control valve 5 and a fault well production main valve 7; and the control valve 4 of the service oil pipe of the fault well is connected with the oil pressure gauge 3 of the fault well through a pipeline; the production control valve 5 of the fault well is respectively connected with a choke 6 of the fault well and a closed discharge tank 8 through pipelines, and the closed discharge tank 8 is connected with a flare torch head 9; the main valve 7 of the fault well production at the other end is also connected with the step-shaped pipeline through a pipeline.
The shaft of the invention is provided with: gas 10 and liquid in the shaft are produced into gas-liquid mixed fluid 11 in the shaft through small-period high-frequency open flow-shut-in by utilizing larger inertia difference between the gas 10 and the liquid in the shaft, and the liquid 12 in the shaft with larger height mixing is gradually formed, so that the pressure drop of the liquid 12 in the shaft is gradually reduced, the near-well pressure difference is increased to a certain degree, further, stratum oil gas is successfully started to enter the shaft, and the self-flow of the oil well is recovered.
The well-facing service oil pipe control valve 2 is a well-facing service oil pipe wing valve.
The well service oil pipe control valve 4 is a well service oil pipe wing valve.
The production control valve 5 of the fault well is a production wing valve of the fault well.
The main production valve 7 of the fault well is a straight-through valve.
The closed discharge tank 8 is rectangular, and arc-shaped covers protruding outwards are mounted at two ends of the rectangle.
The main principle of the invention is as follows: after high-pressure gas of an adjacent well is injected into a blowout-stopping well oil pipe from a well mouth, when the blowout is performed at zero return pressure and large discharge capacity, the gas at the upper part of the shaft and the liquid at the lower part of the shaft move upwards at the same speed.
When the well choke 6 is closed, the upper gas column is closest to the part of the well choke 6, which is blocked by the well choke 6, and stops moving, and the relatively far gas column compresses itself due to inertia and compressibility of the gas, and slows down the upward moving speed; the liquid therein continuously moves upwards at a high speed due to large inertia, and continuously disperses to invade into the gas column and form gas-liquid mixed fluid 11 in the shaft. Again, the zero-back pressure large displacement blowout, again imparts a high velocity of upward migration of the wellbore fluid 12. The failed well choke 6 is closed again and the elevation of the column of mixed fluid 11 in the wellbore is increased. After a plurality of cycles, the elevation of the gas-liquid mixed fluid 11 in the shaft is gradually increased to form a large-elevation mixed fluid column, so that the pressure drop of the shaft fluid 12 is gradually reduced, the near-well pressure difference is increased to a certain degree, the pressure difference between the formation pressure and the shaft fluid is higher than the formation starting pressure difference, the formation oil gas is successfully started to enter the shaft, and the self-injection of the oil well is recovered.
The invention firstly utilizes larger inertia difference between gas and liquid in the shaft, opens and closes the well with small period and high frequency, generates gas-liquid mixed fluid 11, and gradually forms liquid 12 in the shaft with larger height mixing, thereby gradually reducing the pressure drop of the liquid 12 in the shaft, increasing the near-well pressure difference to a certain degree, further successfully starting stratum oil gas to enter the shaft, and recovering the self-injection of the oil well.
The invention adopts the following operation steps:
the first step is as follows: and closing the production wing valve and the choke 6 of the fault well, opening the production main valve 7 of the fault well and the service oil pipe wing valve, then opening the service oil pipe wing valve of the adjacent well, and enabling high-pressure gas of the adjacent well to enter the oil pipe of the fault well through the killing manifold 1.
The second step is that: and (4) soaking the well for 2-3 hours to increase the compression amount of the high-pressure gas and store power energy.
The third step: closing the service oil pipe wing valve of the adjacent well, opening the production wing valve of the fault well and the oil nozzle 6 of the fault well, increasing the production pressure difference, and taking the large-displacement instantaneous discharge volume as: 8000 square/hour, making the fault well shaft gas and liquid move upwards at high flow rate, and recording the change condition of fault well oil pressure meter 3 after 1min.
The fourth step: the oil nozzle 6 of the fault well is closed, the upper gas stops moving due to the blockage of the oil nozzle 6, and the gas at the far end slows down the running speed due to the inertia force and compressibility of the gas; the liquid in the lower part continuously moves upwards at a high flow rate under the action of large inertia force and is dispersed and invaded into the gas in the upper part to form gas-liquid mixed fluid.
The fifth step: repeating the third step and the fourth step, and continuously increasing and moving the generated gas-liquid mixed fluid state liquid upwards through 4-5 cycles until the gas-liquid mixed fluid state liquid is lifted to the ground.
And a sixth step: and repeating the first step, the second step, the third step, the fourth step and the fifth step, and continuously lifting the formed gas-liquid mixed fluid state liquid to the ground in a manner of surging among wells, so that the staged flowback of the accumulated liquid in the shaft is realized, the induced flow is successful finally, and the self-spraying production is repeated.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixed or detachably or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The kill manifold and the wing valve; the oil pressure gauge, the oil nozzle, the production main valve, the closed discharge tank and the torch head are the prior art, and the unexplained technology is the prior art, so the details are not repeated.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (5)

1. The inter-well sloshing type gas lift induced flow method is characterized in that an inter-well sloshing type gas lift induced flow device is arranged, and the inter-well sloshing type gas lift induced flow device comprises: the system comprises a killing manifold arranged outside a shaft and a plurality of control devices connected with the killing manifold; wherein, the first way in the control device of counting is: is provided with: the system comprises a plurality of adjacent well service oil pipe control valves arranged on a pipeline, wherein the pipeline is in a cross shape, and each cross-shaped pipeline is provided with an adjacent well service oil pipe control valve; and the adjacent well service oil pipe control valve at one end is also connected with an adjacent well oil pressure gauge through a pipeline; the adjacent well service oil pipe control valve at the other end is also connected with the stepped pipeline through a pipeline; the second path in the digital control device: is provided with: the system comprises a plurality of fault well service oil pipe control valves arranged on pipelines, wherein the pipelines are in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve, a fault well production control valve and a fault well production main valve; the control valve of the service oil pipe of the fault well is connected with an oil pressure gauge of the fault well through a pipeline; the production control valve of the fault well is respectively connected with a choke of the fault well and a closed discharge tank through pipelines, and the closed discharge tank is connected with a torch head; the main valve for producing the fault well at the other end is also connected with the stepped pipeline through a pipeline;
the control valve of the service oil pipe of the fault well is a wing valve of the service oil pipe of the fault well;
the production control valve of the fault well is a production wing valve of the fault well;
the production main valve of the fault well is a straight-through valve;
the closed discharge tank is rectangular, and arc-shaped covers protruding outwards are mounted at two ends of the rectangle;
the adjacent well service oil pipe control valve is an adjacent well service oil pipe wing valve;
the inter-well agitation type gas lift induced flow device generates gas-liquid mixed fluid by utilizing larger inertia difference between gas and liquid in a shaft and carrying out open flow and close well in a small period and high frequency, and gradually forms larger height mixed liquid, so that the liquid pressure drop in the shaft is gradually reduced, the near-well pressure difference is increased to a certain degree, further, formation oil gas is successfully started to enter the shaft, and the self-flow of an oil well is recovered;
the method comprises the following steps:
the first step is as follows: closing a production wing valve and a choke of the fault well, opening a production main valve of the fault well and a wing valve of a service oil pipe of the fault well, then opening a wing valve of a service oil pipe of an adjacent well, and enabling high-pressure gas of the adjacent well to enter an oil pipe of the fault well through a kill manifold;
the second step: soaking the well to increase the compression amount of the high-pressure gas and store power energy;
the third step: closing a wing valve of an adjacent well service oil pipe, opening a production wing valve of a fault well and an oil nozzle of the fault well, increasing production pressure difference, blowing at a large-displacement instantaneous quantity, enabling gas and liquid in a shaft of the fault well to move upwards at a high flow rate, and recording the change condition of an oil pressure gauge of the fault well;
the fourth step: closing the oil nozzle of the fault well;
the fifth step: repeating the third step and the fourth step to enable the generated gas-liquid mixed fluid state liquid to be continuously enlarged and move upwards until the gas-liquid mixed fluid state liquid is lifted to the ground;
and a sixth step: and repeating the first step and the fifth step, continuously lifting the formed gas-liquid mixed flow state liquid column to the ground by an interwell agitation type method, realizing the staged flowback of the accumulated liquid in the shaft, finally realizing the success of induced spraying and the self-spraying and the reproduction.
2. The method of claim 1, wherein in the second step, the soaking time is 2-3 hours.
3. The method of claim 1, wherein in the third step, the instantaneous discharge amount of the large discharge is: 8000 square/hour for 1min.
4. The method of claim 1, wherein in the fourth step, the purpose of closing the failed well nozzle is to stop the upper gas from moving, and the far-end gas slows down the upward movement under the action of inertia force and compressibility; and the liquid at the lower part continuously moves upwards at a high flow rate under the action of larger inertia force and continuously disperses and invades into the gas at the upper part to form gas-liquid mixed fluid.
5. The method according to claim 1, wherein in the fifth step, after repeating the third step and the fourth step, the generated gas-liquid mixture fluid is enlarged and moved upwards through 4-5 cycles until the gas-liquid mixture fluid is lifted to the ground.
CN202110809562.0A 2021-07-16 2021-07-16 Inter-well agitation type gas lift induced flow device and gas lift induced flow method Active CN113356805B (en)

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US4711306A (en) * 1984-07-16 1987-12-08 Bobo Roy A Gas lift system
CN202767967U (en) * 2012-08-07 2013-03-06 中国石油化工股份有限公司 Self-circulation gas lift drainage gas recovery process device suitable for well outside station
CN104500007B (en) * 2014-12-31 2018-03-13 山东威马泵业股份有限公司 Gas can force the method and apparatus for lifting water or oil
CN206091948U (en) * 2016-10-25 2017-04-12 中国石油化工股份有限公司 Airlift unit between portable well
CN111075400A (en) * 2018-10-18 2020-04-28 中国石油化工股份有限公司 Inter-well gas lift intelligent gas injection method and system
CN209483309U (en) * 2018-12-10 2019-10-11 中国石油天然气股份有限公司 Airlift unit
CN111894525B (en) * 2020-08-14 2021-08-10 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Device and method for composite integrated drainage and mining of unconventional gas reservoir platform

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