CN112377155A - Liquid drainage and gas production integrated method after fracturing modification of low-pressure water-containing reservoir - Google Patents
Liquid drainage and gas production integrated method after fracturing modification of low-pressure water-containing reservoir Download PDFInfo
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- CN112377155A CN112377155A CN202011285666.8A CN202011285666A CN112377155A CN 112377155 A CN112377155 A CN 112377155A CN 202011285666 A CN202011285666 A CN 202011285666A CN 112377155 A CN112377155 A CN 112377155A
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- 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
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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Abstract
The invention belongs to the technical field of yield increase of a fracturing modified oil-gas well, and particularly provides a liquid drainage and gas production integrated method after fracturing modification of a low-pressure water-containing reservoir, which comprises the following steps: after the fracturing modification of the gas well is finished, a coiled tubing drainage string is put into an oil pipe or a casing shaft for drainage, and gas production is started after the drainage of the oil pipe is judged to be finished; after the sleeve drainage is judged to be finished, the coiled tubing drainage string is pulled out firstly, then the gas production string is put into the sleeve shaft, the coiled tubing drainage string is put into the gas production string to drain the gas production string, and after the gas production string drains, gas production is started.
Description
Technical Field
The invention belongs to the technical field of yield increase of a fracturing modified oil-gas well, and particularly relates to a liquid drainage and gas production integrated method after fracturing modification of a low-pressure water-containing reservoir.
Background
The technology for returning fracturing liquid and formation water injected into a formation after fracturing transformation of a low-pressure water-containing reservoir oil-gas well mainly relates to an oil pipe oil drainage technology, an oil pipe swabbing drainage technology, a liquid nitrogen gas lift drainage technology, a continuous oil pipe return drainage technology and the like. However, after the fracturing transformation of a low-pressure water-containing reservoir, due to low formation pressure and insufficient energy, the conventional drainage technology cannot realize timely injection and production of oil gas, and the conventional drainage gas production technology cannot realize continuous gas production operation. Therefore, the invention provides an integrated liquid and gas drainage and production method after fracturing modification of a low-pressure water-containing reservoir.
Disclosure of Invention
The invention provides a liquid drainage and gas production integrated method after fracturing modification of a low-pressure water-containing reservoir, and aims to solve the problems that in the prior art, after fracturing modification of a low-pressure water-containing reservoir, due to low formation pressure and insufficient energy, the conventional liquid drainage technology cannot realize timely injection of produced oil gas, and the conventional water drainage and gas production technology cannot realize continuous water drainage and gas production operation of the water-containing reservoir.
Therefore, the invention provides a liquid drainage and gas production integrated method after fracturing modification of a low-pressure water-containing reservoir, which comprises the following steps:
1) after the fracturing modification of the gas well is finished, putting a continuous oil pipe drainage pipe string in an oil pipe or a sleeve shaft for drainage;
2) when the liquid level of the well bottom accumulated liquid in the oil pipe drops below the perforation section, stopping liquid drainage in the oil pipe and starting gas production; when the liquid level of the well bottom accumulated liquid in the oil pipe rises to a set height, stopping gas production, discharging the liquid again by the continuous oil pipe liquid discharging pipe column string, and repeating the step 2) until the liquid discharging in the oil pipe is finished;
3) after the drainage in the casing is finished, firstly pulling out the coiled tubing drainage string, then putting the gas production string into the casing shaft, putting the coiled tubing drainage string into the gas production string to drain the gas production string, and stopping drainage in the gas production string and starting gas production when the liquid level of the bottom-of-well accumulated liquid in the gas production string drops below the perforation section; and (3) stopping gas production when the liquid level of accumulated liquid at the bottom of the well in the gas production pipe column rises to a set height, discharging liquid again by the coiled tubing liquid discharge pipe column string, and repeating the step 3) until liquid discharge is finished in the gas production pipe column.
The coiled tubing drainage string comprises a cable, a coiled tubing and an automatic start-stop pump, wherein the cable is positioned inside the coiled tubing, and the lower end of the cable is connected with the automatic start-stop pump.
The automatic start-stop pump is positioned 3-5m below the bottom end depth of the perforation section.
The automatic start-stop pump comprises a valve, a water level sensor and a motor, the valve, the water level sensor and the motor are sequentially connected from top to bottom, and a cable is respectively connected with the water level sensor and the motor.
The valve is a one-way valve.
The lower end of the valve is provided with a fluid suction inlet, and the upper end of the valve is provided with a gas discharge outlet.
The automatic start-stop pump is internally provided with a gas-liquid separator, the fluid suction inlet is connected with the inlet of the gas-liquid separator through a valve, the gas outlet of the gas-liquid separator is connected with the gas outlet, and the liquid outlet of the gas-liquid separator is connected with the continuous oil pipe.
The working method of the automatic start-stop pump comprises the following steps: when the liquid level rises to the water level sensor, the motor is started, the motor sucks liquid into the gas-liquid separator from the fluid suction port for gas-liquid separation, the separated gas is discharged from the gas discharge port, and the separated liquid is discharged out of the ground through the coiled tubing.
The invention has the beneficial effects that:
1. after the fracturing modification of the low-pressure water-containing reservoir, the liquid drainage and gas production integrated method comprises the steps that after the fracturing modification of a gas well is finished, a coiled tubing liquid drainage string is put into an oil pipe or a sleeve shaft for liquid drainage, the coiled tubing liquid drainage string comprises a cable, a coiled tubing and an automatic start-stop pump, and the automatic start-stop pump comprises a valve, a water level sensor and a motor; the cable supplies power to the motor, when the liquid level rises to the water level sensor, the motor is started, the motor sucks liquid from a fluid suction port of the valve into the gas-liquid separator for gas-liquid separation, the separated gas is discharged from a gas discharge port, the separated liquid is discharged out of the ground through the coiled tubing until the liquid level drops below the water level sensor, the motor is closed, the automatic start-stop pump stops discharging liquid, and the gas production string in the oil tube or the sleeve shaft starts gas production; when the liquid level rises to the water level sensor, stopping gas production, starting the motor again, automatically starting and stopping the pump to discharge liquid again, and repeating the steps until the liquid discharge of the oil pipe or the sleeve is finished, so that the integration of liquid discharge and gas production after the fracturing transformation of the low-pressure water-bearing reservoir is realized;
2. according to the liquid discharging and gas producing integrated method after the low-pressure water-containing reservoir fracturing modification, even if the low-pressure water-containing reservoir fracturing modification is completed due to low formation pressure and insufficient energy, the motor can suck liquid into the gas-liquid separator from the fluid suction port of the valve for gas-liquid separation, and the problem that the conventional liquid discharging technology cannot realize timely injection of produced oil gas is solved;
3. the liquid discharging and gas producing integrated liquid discharging technology after fracturing modification of the low-pressure water-containing reservoir provided by the invention has the advantages of short period and low difficulty, the liquid flowback rate of a gas well of the water-containing reservoir after fracturing is improved, the liquid discharging period is shortened, the damage of viscosity of fracturing liquid and the like is reduced, and the recovery ratio of the water-containing reservoir is finally improved.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the liquid drainage and gas production integrated method after the low-pressure water-bearing reservoir fracturing reformation.
Description of reference numerals: 1. a cable; 2. a coiled tubing; 3. a sleeve; 4. a fluid intake; 5. a gas discharge port; 6. a perforation section; 7. a valve; 8. a water level sensor; 9. an electric motor.
Detailed Description
Example 1:
as shown in fig. 1, a liquid drainage and gas production integrated method after fracturing reformation of a low-pressure water-bearing reservoir comprises the following steps: 1) after the fracturing modification of the gas well is finished, putting a continuous oil pipe drainage pipe string in an oil pipe or a sleeve shaft for drainage;
2) when the liquid level of the well bottom accumulated liquid in the oil pipe drops below the perforation section, stopping liquid drainage in the oil pipe and starting gas production; when the liquid level of the well bottom accumulated liquid in the oil pipe rises to a set height, stopping gas production, discharging the liquid again by the continuous oil pipe liquid discharging pipe column string, and repeating the step 2) until the liquid discharging in the oil pipe is finished, so that the liquid discharging and gas production integration of the oil pipe is realized;
3) after the drainage in the casing is finished, firstly pulling out the coiled tubing drainage string, then putting the gas production string into the casing shaft, putting the coiled tubing drainage string into the gas production string to drain the gas production string, and stopping drainage in the gas production string and starting gas production when the liquid level of the bottom-of-well accumulated liquid in the gas production string drops below the perforation section; and (3) stopping gas production when the liquid level of accumulated liquid at the bottom of the well in the gas production pipe column rises to a set height, discharging liquid again by the coiled tubing liquid discharge pipe column string, and repeating the step 3) until liquid discharge is finished in the gas production pipe column, so that liquid discharge and gas production integration of the sleeve is realized.
Further, the basis for judging whether the liquid drainage of the oil pipe and the sleeve is finished is as follows: when the oil pressure of the well mouth is recovered and tends to be stable, judging that the liquid discharge of the oil pipe is finished; when the wellhead casing pressure rises back and tends to be stable, judging that casing drainage is finished; when the accumulated liquid exists in the bottom of the oil pipe well and the accumulated liquid does not exist in the bottom of the casing pipe well, the differential pressure of the oil sleeve is large, the differential pressure of the oil sleeve at the well head becomes infinitely close to 0MPa through the reduction of the differential pressure of the oil sleeve at the well head, and the accumulated liquid in the bottom of the oil pipe well is judged to be completely removed; and when the oil pressure of the wellhead of the gas production string rises back and tends to be stable, judging that the liquid drainage of the gas production string is finished.
The liquid discharging and gas producing integrated liquid discharging technology after fracturing modification of the low-pressure water-containing reservoir provided by the invention has the advantages of short period and low difficulty, the liquid flowback rate of a gas well of the water-containing reservoir after fracturing is improved, the liquid discharging period is shortened, the damage of viscosity of fracturing liquid and the like is reduced, and the recovery ratio of the water-containing reservoir is finally improved.
Example 2:
on the basis of the embodiment 1, further, the coiled tubing drainage string comprises a cable 1, a coiled tubing 2 and an automatic start-stop pump, the cable 1 is located inside the coiled tubing 2, and the lower end of the cable 1 is connected with the automatic start-stop pump. After gas well fracturing transformation is finished, go into coiled tubing flowing back tubular column cluster in oil pipe or 3 pit shafts of sleeve pipe and carry out the flowing back, when the liquid level rises to the liquid level that needs the flowing back, open the start-stop pump automatically and start, pass through coiled tubing 2 discharge ground with liquid, when the liquid level descends to below the liquid level that needs the flowing back, open the start-stop pump automatically and stop, the flowing back is ended, begin the gas production, realized the continuous intelligent drainage gas production in water-bearing reservoir, degree of automation is high, shorten flowing back cycle, the flowing back reduces the degree of difficulty.
Further, the automatic start-stop pump is positioned 3-5m below the bottom end depth of the perforation section 6. Automatic and continuous gas production is realized, the liquid drainage period is shortened, and the effective gas production time is increased; reducing the pressure drop rate of the stratum and improving the recovery ratio of the reservoir.
Further, the automatic start-stop pump comprises a valve 7, a water level sensor 8 and a motor 9, the valve 7, the water level sensor 8 and the motor 9 are sequentially connected from top to bottom, and the cable 1 is respectively connected with the water level sensor 8 and the motor 9. The cable 1 supplies power and transmits signals to the water level sensor 8 and the motor 9, the automation degree is high, when the liquid level rises to the water level sensor 8, the motor 9 is started, the motor 9 discharges the liquid out of the ground through the coiled tubing 2, and after liquid drainage is finished, gas production is started, so that continuous water drainage and gas production of a water-containing reservoir are realized; even if the low-pressure water-containing reservoir is fractured and transformed, because the formation pressure is low and the energy is insufficient, the motor 9 can discharge the liquid to the ground through the continuous oil pipe 2, the problem that the conventional liquid discharge technology cannot realize timely injection and oil gas production is solved, and the liquid flow-back rate of the fractured water-containing reservoir is improved; the motor 9 can improve the discharge rate of liquid according to actual conditions, and reduce the damage of fracturing fluid viscosity. The water level sensor is an existing sensor, and the specific structure of the existing sensor is not described in detail.
Further, the valve 7 is a one-way valve. The one-way valve avoids backflow of discharged liquid, and improves liquid backflow rate and construction safety.
Further, the lower end of the valve 7 is provided with a fluid suction inlet 4, and the upper end of the valve 7 is provided with a gas discharge outlet 5. The fluid suction inlet 4 is convenient for the motor to suck liquid in a centralized way, the gas discharge outlet 5 is convenient for gas to discharge in a centralized way, and the structure is simple and the design is reasonable.
Furthermore, a gas-liquid separator is arranged inside the automatic start-stop pump, the fluid suction port 4 is connected with an inlet of the gas-liquid separator through a valve 7, a gas outlet of the gas-liquid separator is connected with a gas outlet 5, and a liquid outlet of the gas-liquid separator is connected with the continuous oil pipe 2. The gas-liquid separator is convenient for carrying out gas-liquid separation on liquid, and gas and liquid are discharged through different processes, so that the damage of fluid to the automatic starting and stopping pump is reduced, the service life of the automatic starting and stopping pump is prolonged, the automation degree is high, and the construction safety is improved. The gas-liquid separator is an existing separator, and the specific structure of the separator is not described in detail.
Furthermore, the number of the one-way valves is at least 3, and the one-way valves are arranged between the fluid suction inlet and the inlet of the gas-liquid separator, between the gas outlet of the gas-liquid separator and the gas outlet 5, and between the liquid outlet of the gas-liquid separator and the continuous oil pipe 2; the one-way valve avoids liquid or gas backflow, improves the backflow rate of liquid or gas, and improves the construction safety.
Further, the fluid suction inlet is provided with a screen; the arrangement of the screen can prevent the motor from being damaged by large sundries in the liquid when the motor sucks the liquid, thereby protecting the motor.
Furthermore, the automatic start-stop pump is an explosion-proof automatic start-stop pump, the explosion-proof grade is Exd II BT4, and the explosion-proof and protection requirements of oil and gas well production places are met.
Further, the working method of the automatic start-stop pump comprises the following steps: when the liquid level rises to the water level sensor 8, the motor 9 is started, the motor 9 sucks liquid into the gas-liquid separator from the fluid suction port 4 of the valve 7 for gas-liquid separation, the separated gas is discharged from the gas discharge port 5, and the separated liquid is discharged out of the ground through the coiled tubing 2. The method is simple and has high safety.
After the fracturing modification of the low-pressure water-containing reservoir, the liquid drainage and gas production integrated method comprises the steps that after the fracturing modification of a gas well is finished, a coiled tubing liquid drainage string is put into an oil pipe or a sleeve shaft for liquid drainage, the coiled tubing liquid drainage string comprises a cable, a coiled tubing and an automatic start-stop pump, and the automatic start-stop pump comprises a valve, a water level sensor and a motor; the cable supplies power to the motor, when the liquid level rises to the water level sensor, the motor is started, the motor sucks liquid from the fluid suction port into the gas-liquid separator for gas-liquid separation, the separated gas is discharged from the gas discharge port, the separated liquid is discharged out of the ground through the coiled tubing until the liquid level drops below the water level sensor, the motor is closed, the pump is automatically started and stopped to discharge liquid, and the gas production string in the oil tube or the sleeve shaft starts gas production; when the liquid level rises to the water level sensor, stopping gas production, starting the motor again, automatically starting and stopping the pump to discharge liquid again, and repeating the steps until the liquid discharge of the oil pipe or the sleeve is finished, so that the integration of liquid discharge and gas production after the fracturing transformation of the low-pressure water-bearing reservoir is realized; the liquid drainage technology has short period and small difficulty, improves the liquid flowback rate of the gas well of the water-containing reservoir after fracturing, shortens the liquid drainage period, reduces the damage of the viscosity of the fracturing liquid and the like, and finally improves the recovery ratio of the water-containing reservoir.
In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," if any, are used in the sense of being interpreted as being based on the orientation or positional relationship shown in the drawings, and not as an indication or suggestion that the referenced device or element must have the particular orientation, configuration or operation in the particular orientation, and therefore the terms describing the positional relationship in the drawings are used for illustrative purposes only and are not to be construed as limiting the patent.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. A liquid drainage and gas production integrated method after fracturing modification of a low-pressure water-containing reservoir is characterized by comprising the following steps:
1) after the fracturing modification of the gas well is finished, putting a coiled tubing drainage string in an oil pipe or a shaft of a casing (3) for drainage;
2) when the liquid level of the well bottom accumulated liquid in the oil pipe drops below the perforation section, stopping liquid drainage in the oil pipe and starting gas production; when the liquid level of the well bottom accumulated liquid in the oil pipe rises to a set height, stopping gas production, discharging the liquid again by the continuous oil pipe liquid discharging pipe column string, and repeating the step 2) until the liquid discharging in the oil pipe is finished;
3) after liquid drainage in the casing (3) is finished, firstly, the coiled tubing liquid drainage pipe string is lifted out, then, a gas production pipe string is put into a shaft of the casing (3), the coiled tubing liquid drainage pipe string is put into the gas production pipe string to drain the liquid of the gas production pipe string, and when the liquid level of the bottom-hole liquid in the gas production pipe string drops below the perforation section, the liquid drainage in the gas production pipe string is stopped, and gas production is started; and (3) stopping gas production when the liquid level of accumulated liquid at the bottom of the well in the gas production pipe column rises to a set height, discharging liquid again by the coiled tubing liquid discharge pipe column string, and repeating the step 3) until liquid discharge is finished in the gas production pipe column.
2. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 1, characterized by comprising the following steps: the coiled tubing drainage string comprises a cable (1), a coiled tubing (2) and an automatic start-stop pump, wherein the cable (1) is located inside the coiled tubing (2), and the lower end of the cable (1) is connected with the automatic start-stop pump.
3. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 2, characterized by comprising the following steps: the automatic start-stop pump is positioned 3-5m below the bottom end depth of the perforation section (6).
4. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 2, characterized by comprising the following steps: the automatic start-stop pump comprises a valve (7), a water level sensor (8) and a motor (9), wherein the valve (7), the water level sensor (8) and the motor (9) are sequentially connected from top to bottom, and a cable (1) is respectively connected with the water level sensor (8) and the motor (9).
5. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 4, characterized by comprising the following steps: the valve (7) is a one-way valve.
6. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 5, characterized by comprising the following steps: the lower end of the valve (7) is provided with a fluid suction inlet (4), and the upper end of the valve (7) is provided with a gas outlet (5).
7. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to claim 6, characterized by comprising the following steps: the automatic start-stop pump is internally provided with a gas-liquid separator, a fluid suction inlet (4) is connected with an inlet of the gas-liquid separator through a valve (7), a gas outlet of the gas-liquid separator is connected with a gas outlet (5), and a liquid outlet of the gas-liquid separator is connected with a continuous oil pipe (2).
8. The integrated liquid and gas drainage and production method after low-pressure aqueous reservoir fracturing reformation according to any one of claims 2 to 7, characterized by comprising the following steps: the working method of the automatic start-stop pump comprises the following steps: when the liquid level rises to the water level sensor (8), the motor (9) is started, the motor (9) sucks liquid into the gas-liquid separator from the fluid suction port (4) for gas-liquid separation, the separated gas is discharged from the gas discharge port (5), and the separated liquid is discharged out of the ground through the coiled tubing (2).
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| CN202011285666.8A CN112377155A (en) | 2020-11-17 | 2020-11-17 | Liquid drainage and gas production integrated method after fracturing modification of low-pressure water-containing reservoir |
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| CN202011285666.8A CN112377155A (en) | 2020-11-17 | 2020-11-17 | Liquid drainage and gas production integrated method after fracturing modification of low-pressure water-containing reservoir |
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Cited By (1)
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| CN115898339A (en) * | 2022-10-28 | 2023-04-04 | 西安蓝水泵业有限公司 | Downhole pressurized gas recovery system and method |
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