CN114183099A - Negative pressure lifting shaft liquid operation method - Google Patents
Negative pressure lifting shaft liquid operation method Download PDFInfo
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- CN114183099A CN114183099A CN202210135675.1A CN202210135675A CN114183099A CN 114183099 A CN114183099 A CN 114183099A CN 202210135675 A CN202210135675 A CN 202210135675A CN 114183099 A CN114183099 A CN 114183099A
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/13—Lifting well fluids specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of oil field well repairing technology, in particular to a liquid operation method for a negative pressure lifting shaft.A ball seat is connected with an oil pipe and is put into a casing pipe to a proper depth, and a steel ball is put into the casing pipe from the oil pipe; connecting the coiled tubing equipment and the nitrogen making vehicle with a gas well Christmas tree, and putting the coiled tubing into the oil pipe for 20 meters; starting a nitrogen making vehicle to make a nitrogen gas lift, allowing high-pressure nitrogen to enter an oil pipe to drive the liquid level in the oil pipe to drop to an outlet at the bottom of the coiled oil pipe, allowing the high-pressure nitrogen to enter the coiled oil pipe to be mixed with well killing fluid to form mixed gas and liquid, spraying the mixed gas and liquid out of the ground, injecting the high-pressure nitrogen while putting the coiled oil pipe, and continuously taking the well killing fluid in the oil pipe out of the ground by the high-pressure nitrogen; along with the reduction of the liquid level in the oil pipe, well liquid in the casing pipe continuously descends under the action of gravity, negative pressure is formed in the casing pipe, the fluid in the stratum continuously flows into the bottom of the well, the steel ball is pushed open to enter the oil pipe and be lifted out of the ground until the casing pipe and the fluid in the stratum are all lifted to the ground. The invention protects the oil-gas layer, recovers the productivity and improves the success rate of putting the oil well and the gas well into production.
Description
Technical Field
The invention relates to the technical field of oil field well repairing processes, in particular to a negative pressure lifting shaft liquid operation method.
Technical Field
At present, in the development process of a self-blowing well and a gas well in an oil field, well bore internal pressure well liquid is discharged to the ground before operation and production of the self-blowing well and the gas well, particularly, stratum natural gas fluid in the well bore in a negative pressure state can be transported to the well bottom and then is produced to the ground. In the process of extruding nitrogen gas by gas lift, a certain high-pressure acting force is applied to the sleeve to cause certain damage to the stratum. For example, in a 4000-meter deep gas well, if the pressure applied to the stratum is 40MPa in the case of using clean water, the pressure applied to the stratum by a surface nitrogen vehicle is 25MPa, so that the pressure applied to the stratum is 65 MPa. Gas wells often have a phenomenon that many gas wells are not lifted and do not produce gas after being lifted.
Through analyzing the existing technical problems, the gas lift process is judged to be not suitable, and overlarge pressure is applied to the stratum, so that part of the well killing fluid enters the stratum to damage an oil and gas channel or push fragments near a well hole to block the crack or close the crack again, and part of the well is blocked by the well killing fluid to lay aside for production, thereby causing serious economic loss to oil field production.
Disclosure of Invention
In view of the existing problems, the invention aims to provide a method for operating liquid in a negative pressure lifting shaft, which overcomes the defects and shortcomings in the prior art, can form negative pressure in a casing and protect a producing zone in the casing in the process of lifting the casing liquid, enables formation fluid to flow into the shaft and be lifted out of the ground, enables a flowing well and a gas well to be directly put into production, shortens gas lifting time, improves the success rate of putting the flowing well and the gas well into production, and improves the economic benefit of enterprises.
A negative pressure lift well shaft liquid operation method comprises the following steps:
1. preparing, wearing labor protection products, preparing tools and tools, and using nitrogen making vehicles, continuous oil pipe equipment and other related auxiliary equipment, fire-fighting equipment and sulfur dioxide protection products.
2. And (3) running the pipe column, connecting the ball seats and the oil pipes one by one, running the pipe column into the gas well casing pipe for ten meters below the perforation well section, sitting the hanger, throwing steel balls from the oil pipes, and installing the Christmas tree at the well mouth.
3. The ground equipment and the process are connected, a test gate of the Christmas tree is connected with a blowout preventer of the coiled tubing equipment, and the coiled tubing equipment is hoisted; connecting the nitrogen making vehicle with a production gate of the Christmas tree through a nitrogen pipeline; and opening the blowout preventer, the test gate and the main gate, and putting the coiled tubing into the oil pipe for 20 meters.
4. And (3) testing the pressure, namely opening a main gate, a production gate and a casing gate, closing a well sealer, closing a continuous oil pipe outlet gate, starting a nitrogen making vehicle to test the pressure of a nitrogen pipeline, a Christmas tree, the well sealer, an oil pipe and a steel ball, observing the pressure through a pressure gauge until the pressure is 25MPa, stabilizing the pressure for 30min, and enabling the pressure to be not more than 0.5 MPa.
5. The method comprises the following steps of (1) performing gas lift, opening a continuous oil pipe outlet gate, a Christmas tree casing gate and a pressure gauge gate, starting a nitrogen making vehicle to make the nitrogen lift, enabling high-pressure nitrogen to enter an oil pipe, driving the liquid level in the oil pipe to drop to the outlet position at the bottom of the continuous oil pipe, enabling the high-pressure nitrogen to enter the continuous oil pipe, mixing with well killing fluid to form mixed liquid, spraying the mixed liquid to the ground, injecting the high-pressure nitrogen while inserting the continuous oil pipe, and continuously taking the well killing fluid out of the ground; along with the reduction of the liquid level in the oil pipe, the liquid in the shaft pushes the steel ball to enter the oil pipe under the action of gravity, and the liquid level of the shaft oil sleeve annulus is continuously reduced; the pressure of liquid in the shaft to the bottom of the well is gradually reduced, when the pressure of the bottom of the well is smaller than the pressure of the stratum, relative negative pressure is formed in the shaft, the fluid (oil gas) in the stratum continuously flows into the bottom of the well, and the steel ball is pushed to enter the oil pipe; along with the lapse of gas lift time, kill-job fluid, stratum fluid are lifted to the ground through the oil pipe, the well bore has formed the negative pressure state, the stratum oil gas fluid flows to the shaft bottom after the well bore forms the negative pressure, kill-job fluid is lifted to the ground, the stratum gas transports and rises to the well bore sleeve pipe and annular space of the oil pipe to the shaft bottom, along with the increase of the tolerance, and then exert pressure to the annular space liquid level of the oil jacket, until all liquid in the annular space of the sleeve pipe is pressed into the oil pipe and lifted to the ground, finally the annular space liquid level of the oil jacket drops to the position of ball seat; the pressure in the shaft is always in a reduced state in the whole gas lift process, and the pressure is not increased to the stratum by the well killing fluid in the gas lift oil sleeve annulus;
6. detecting, namely detecting the gas ascending into the annular space of the oil jacket of the shaft by a four-in-one gas detector, and sampling a laboratory for further testing; and (3) measuring the content of chloride ions in the stratum liquid lifted to the ground by a silver nitrate titration method, and judging whether the stratum well liquid is completely drained.
7. And stopping the nitrogen making vehicle, closing the outlet gate and the production gate of the continuous oil pipe, and lifting the continuous oil pipe out of the ground.
8. Tools and appliances are picked up, and relevant data is recorded in the operation report.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has novel design, safe operation, convenience and rapidness;
2. the gas lift can be started at any depth of a gas well, the gas lift can be ensured to be opened every time in the gas lift process, the pressure is not added to the stratum, the negative pressure is formed in the sleeve, the stratum fluid smoothly flows into the bottom of the well, and the stratum fracture is protected;
3. the invention can solve various lifting obstruction phenomena, avoid formation damage caused by overhigh gas lifting pressure and avoid the occurrence of maintenance stoppage of a gas well due to lifting;
4. the nitrogen making vehicle is in a low-power state to work, so that oil is saved, and the service life of the nitrogen making vehicle is prolonged;
5. the invention shortens the gas lifting time of the gas well, enables the self-blowing well of the oil well and the gas well to be directly put into production, improves the success rate of putting the self-blowing well of the oil well and the gas well into production and improves the economic benefit of enterprises.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an exemplary embodiment of the invention and, together with the description, serve to explain the invention without limitation.
FIG. 1 is a schematic diagram of the field application structure of the present invention
In the drawings: 0. the system comprises a ball seat, 1, a steel ball, 2, a sleeve, 3, an oil pipe, 4, a coiled tubing, 5, the liquid level in the oil pipe, 6, the liquid level in the annular space of the oil sleeve, 7, a nitrogen making vehicle, 8, a nitrogen pipeline, 9, coiled tubing equipment, 9-1, a blowout preventer and 9-2, an outlet gate of the coiled tubing; 10. the method comprises the following steps of (1) extracting a Christmas tree, 10-0 parts of a main gate, 10-1 parts of a production gate, 10-2 parts of a test gate, 10-3 parts of a pressure gauge and 10-4 parts of a casing gate; 11. a wellbore.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such implementation(s) may be practiced without these specific details.
As shown in fig. 1, a method of operating a fluid in a negative pressure lift well according to the present invention comprises:
step one, preparation work, namely wearing labor protection products by workers, preparing tools and tools, nitrogen making vehicles 7, continuous oil pipe equipment 9 and other related auxiliary equipment, fire-fighting equipment, hydrogen sulfide gas detection equipment and other protection products and conveying the equipment to an operation site.
And step two, a pipe column is lowered, the ball seat 0 and the oil pipe 3 are connected and lowered into the gas well casing 2 10 meters below the perforation well section, a hanger is arranged, steel balls 1 are thrown in from the oil pipe 3, the Christmas tree 10 is installed at the well mouth, and all parts of the Christmas tree 10 are connected and fastened through bolts.
Step three, ground connection, namely connecting a test gate 10-2 of the Christmas tree 10 with a blowout preventer 9-1 of the coiled tubing equipment 9, and hoisting the coiled tubing equipment 9; connecting a nitrogen making vehicle 7 with a production gate 10-1 of a Christmas tree 10 through a nitrogen pipeline 8; connecting and screwing the screw thread; and opening the blowout preventer 9-1, the test gate 10-2 and the main gate 10-0, and putting the coiled tubing 4 into the tubing 3 for 20 m.
And step four, testing pressure, namely opening a main gate 10-0, a production gate 10-1 and a casing gate 10-4, closing a well sealer 9-1, closing a continuous oil pipe outlet gate 9-2, starting a nitrogen making vehicle 7 to test the pressure of a nitrogen pipeline 8, a Christmas tree 10, the well sealer 9-1, an oil pipe 3 and a steel ball 1 for 25MPa, stabilizing the pressure for 30min, and judging that the pressure drop is not more than 0.5MPa to be qualified.
Step five, gas lift, opening an outlet gate 9-2 of the continuous oil pipe, a sleeve gate 10-4 of the Christmas tree 10 and a gate 10-3 of a pressure gauge, starting a nitrogen making vehicle 7 to make the nitrogen lift, enabling high-pressure nitrogen to enter the oil pipe 3, driving the liquid level 5 in the oil pipe to descend to the outlet position at the bottom of the continuous oil pipe 4, enabling the high-pressure nitrogen to enter the continuous oil pipe 4 to be mixed with well killing fluid to form mixed gas and liquid to be sprayed out of the ground together, injecting the high-pressure nitrogen while descending the continuous oil pipe 4, and enabling the well killing fluid in the oil pipe 3 to be continuously taken out of the ground; along with the reduction of the liquid level 5 in the oil pipe 3, the killing fluid in the shaft 11 pushes the steel ball 1 into the oil pipe 3 under the action of gravity, and the annular liquid level 6 of the oil sleeve of the shaft 11 is continuously reduced; the liquid in the shaft 11 gradually reduces the pressure at the bottom of the well, when the pressure at the bottom of the well is smaller than the pressure of the stratum, relative negative pressure is formed in the shaft 11, the fluid (oil, gas and water) in the stratum continuously flows into the bottom of the well, and the steel ball 1 is pushed open to enter the oil pipe 3; along with the prolonging of the gas lift time, the fluid in the stratum is lifted out of the ground through the oil pipe 3, a negative pressure state is formed in the shaft 11, the fluid in the stratum, oil, gas and water flows to the bottom of the well and is lifted out of the ground, the stratum gas moves to the bottom of the well and then rises into the annular space of the casing pipe 2 and the oil pipe 3, along with the increase of the gas quantity, pressure is applied to the annular space liquid level 6 of the oil casing until the liquid in the annular space of the casing pipe is completely pressed into the oil pipe 3 and is lifted out of the ground, and finally the annular space liquid level 6 of the oil casing pipe falls to the position of the ball seat 0; the pressure in the shaft 11 always tends to be reduced in the whole gas lift process, and the pressure is not increased to the stratum by the killing fluid in the gas lift oil sleeve annulus;
detecting gas rising into the annular space of the oil jacket of the shaft, detecting the nature and the content of formation gas by a four-in-one gas detector, and carrying out further test in a laboratory after sampling; and (3) measuring the content of chloride ions in the stratum liquid lifted to the ground by a silver nitrate titration method, and judging whether the stratum well liquid returns completely.
And step seven, stopping the operation of the nitrogen making vehicle 7, closing the outlet gate 9-2 and the production gate 10-1 of the continuous oil pipe, lifting the continuous oil pipe 4 out of the ground, closing the test gate 10-2, detaching the test gate 10-2 of the Christmas tree 10 and the blowout preventer 9-1 of the continuous oil pipe equipment 9, hoisting the continuous oil pipe equipment 9, and detaching the nitrogen making vehicle 7 and the production gate 10-1 of the Christmas tree 10 through the nitrogen pipeline 8.
Step eight, collecting tools and appliances, and recording related data into the operation report.
And step nine, connecting the production gates 10-1 on two sides of the Christmas tree 10 with an oil nozzle sleeve and a gas production process in sequence, opening the main gate 10-0, and enabling the gas production well to enter a production-seeking procedure.
Through the steps, the operation method for lifting the shaft liquid under the negative pressure is safe, convenient and fast to operate, the nitrogen making vehicle 7 and the coiled tubing equipment 9 are utilized, the gas well oil sleeve annular liquid and the well killing liquid pressed into the gas layer during operation can be lifted to the ground under the negative pressure condition in a short time, the gas layer is protected, and the production success rate of the gas well is improved.
Claims (1)
1. A negative pressure lift well shaft liquid operation method comprises the following steps:
firstly, preparing, namely transporting the nitrogen making vehicle (7), the coiled tubing equipment (9) and other related auxiliary equipment to a well site;
step two, a pipe column is lowered, the ball seat (0) and the oil pipe (3) are connected and lowered into the gas well casing (2) 10 meters below the perforation well section, a hanger is seated, steel balls (1) are thrown from the oil pipe (3), and a Christmas tree (10) is installed at the well head;
thirdly, ground connection, namely connecting a test gate (10-2) of the Christmas tree (10) with a blowout preventer (9-1) of the coiled tubing equipment (9) and hoisting the coiled tubing equipment (9); connecting a nitrogen making vehicle (7) with a production gate (10-1) of a Christmas tree (10) through a nitrogen pipeline (8); opening the blowout preventer (9-1), the test gate (10-2) and the main gate (10-0), and putting the coiled tubing (4) into the tubing (3) for 20 m;
step four, testing pressure of the pipeline, namely opening a main gate (10-0), a production gate (10-1), a casing gate (10-4), closing a well sealer (9-1), closing a continuous oil pipe outlet gate (9-2), starting a nitrogen making truck (7) to test the pressure of the nitrogen pipeline (8), the Christmas tree (10), the well sealer (9-1), the oil pipe (3) and the steel ball (1) for 25MPa, and stabilizing the pressure for 30min, wherein the pressure drop is not more than 0.5MPa, so that the pipeline is qualified;
opening a continuous oil pipe outlet gate (9-2), a casing gate (10-4) of a Christmas tree (10) and a pressure gauge (10-3) gate, starting a nitrogen making vehicle (7) to make the nitrogen lift, enabling high-pressure nitrogen to enter an oil pipe (3), driving a liquid level (5) in the oil pipe (3) to descend to an outlet position at the bottom of the continuous oil pipe (4), enabling the high-pressure nitrogen to enter the continuous oil pipe (4) to be mixed with well killing fluid to form mixed liquid to be sprayed out of the ground together, injecting the high-pressure nitrogen while descending the continuous oil pipe (4), and enabling the well killing fluid in the oil pipe (3) to be continuously taken out of the ground; along with the reduction of the liquid level (5) in the oil pipe, the liquid in the shaft (11) pushes the steel ball (1) open to enter the oil pipe (3) under the action of gravity, and the liquid level (6) of the oil sleeve annulus of the shaft (11) is continuously reduced; the pressure of liquid in the shaft (11) to the bottom of the well is gradually reduced, when the pressure of the bottom of the well is smaller than the pressure of the stratum, relative negative pressure is formed in the shaft (11), fluid (oil gas) in the stratum continuously flows into the bottom of the well, and the steel ball (1) is jacked to enter the oil pipe (3); along with the gas lift time, killing fluid and formation fluid are lifted out of the ground through the oil pipe (3), a negative pressure state is formed in the shaft (11), after negative pressure is formed in the shaft (11), formation oil gas fluid flows to the bottom of the well, the killing fluid is lifted out of the ground, formation gas moves to the bottom of the well and rises to the annular space between the casing (2) of the shaft (11) and the oil pipe (3), pressure is further applied to the annular space liquid level (6) of the oil casing along with the increase of gas flow until the liquid in the annular space of the casing is completely pressed into the oil pipe (3) and lifted out of the ground, and finally the annular space liquid level (6) of the oil casing descends to the position of the ball seat (0); the pressure in the shaft (11) is always in a reduced state in the whole gas lift process, and the pressure is not increased to the stratum by the killing fluid in the gas lift oil sleeve annulus;
detecting, namely detecting the gas ascending to the annular space of the oil jacket of the shaft (11), detecting the gas content by a four-in-one gas detector, and performing further test in a sampling laboratory; measuring the content of chloride ions in the stratum liquid lifted to the ground by a silver nitrate titration method, and judging whether the stratum well liquid is completely drained;
and step seven, stopping the operation of the nitrogen making vehicle (7), closing the outlet gate (9-2) and the production gate (10-1) of the continuous oil pipe, and lifting the continuous oil pipe (4) out of the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210135675.1A CN114183099A (en) | 2022-02-15 | 2022-02-15 | Negative pressure lifting shaft liquid operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210135675.1A CN114183099A (en) | 2022-02-15 | 2022-02-15 | Negative pressure lifting shaft liquid operation method |
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| CN113356798A (en) * | 2021-06-03 | 2021-09-07 | 德仕能源科技集团股份有限公司 | Pneumatic pump gas lift oil production method |
| CN215485964U (en) * | 2021-06-03 | 2022-01-11 | 德仕能源科技集团股份有限公司 | Pneumatic pump gas lift oil production device |
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2022
- 2022-02-15 CN CN202210135675.1A patent/CN114183099A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587879A (en) * | 2012-03-22 | 2012-07-18 | 胜利油田泰峰机电有限责任公司 | Oil production method using steam power to lift thick oil |
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Application publication date: 20220315 |