CN116696279B - Temporary blocking operation method of long straight well section gas storage - Google Patents
Temporary blocking operation method of long straight well section gas storage Download PDFInfo
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- CN116696279B CN116696279B CN202310980873.2A CN202310980873A CN116696279B CN 116696279 B CN116696279 B CN 116696279B CN 202310980873 A CN202310980873 A CN 202310980873A CN 116696279 B CN116696279 B CN 116696279B
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 238000003860 storage Methods 0.000 title claims abstract description 58
- 230000000903 blocking effect Effects 0.000 title description 9
- 238000010276 construction Methods 0.000 claims abstract description 124
- 238000002347 injection Methods 0.000 claims abstract description 105
- 239000007924 injection Substances 0.000 claims abstract description 105
- 238000004519 manufacturing process Methods 0.000 claims abstract description 84
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 72
- 230000008569 process Effects 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 230000002147 killing effect Effects 0.000 claims description 45
- 239000012530 fluid Substances 0.000 claims description 13
- 230000009545 invasion Effects 0.000 claims description 13
- 238000007872 degassing Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000007281 self degradation Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 210000002445 nipple Anatomy 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012216 screening Methods 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a temporary plugging operation method of a long straight well section gas storage, which comprises the following steps: injecting well-killing liquid into the sleeve, and performing well-killing construction operation of an injection production well; in the well-killing construction operation process of the injection and production well, a long-acting temporary plugging agent is put into the sleeve, meanwhile, the temporary plugging construction pressure change is monitored, when the temporary plugging construction pressure does not obviously rise, the short-acting temporary plugging agent is put in place, the injection displacement of the well-killing liquid is controlled, the temporary plugging construction pressure change is observed, and when the temporary plugging construction pressure obviously rises, the temporary plugging construction operation of the injection and production well is completed. According to the reservoir environment and construction requirements, the long-acting temporary plugging agent with good grading is selected to plug large tunnels and perforation holes of the stratum; according to the leakage condition in the temporary plugging construction operation process of the injection well, short-acting temporary plugging particles are added circularly to plug the leakage occurring in the construction period; the invention provides a method for composite temporary plugging safe operation for effectively plugging a long straight well section gas storage.
Description
Technical Field
The invention relates to the technical field of oilfield gas reservoirs, in particular to a temporary plugging operation method of a long straight well section gas reservoir.
Background
The construction of the underground gas storage has great significance for the energy safety guarantee of China, but the gas invasion and well leakage phenomena caused by long-term injection and production are required to be effectively and reliably carried out on the injection and production well by utilizing the high-efficiency and reliable temporary plugging technology while the gas storage is continuously constructed, so that the normal operation of the gas storage is ensured.
In the gas storage well injection and production operation process, the oil sleeve and the lower packer are in a high-pressure environment for a long time, so that the problems of packer failure, downhole safety valve failure, sleeve deformation, sleeve leakage, wellhead leakage and the like are easy to occur, and therefore, necessary well repair operation is required to ensure safe production. Especially for the long straight well section that the perforation is densely arranged, if utilize temporary blocking technique to carry out the workover, lead to temporary blocking effect not good because of temporary blocking scheme's unreasonable design, cause waiting to block regional flow field more complicated to influence the normal operating of whole gas storage in later stage, cause huge economic loss.
In view of this, the present invention has been made.
Disclosure of Invention
In order to solve the problems, the invention provides a temporary plugging operation method of a long vertical well section gas storage, which adopts a composite temporary plugging safety operation method and provides a new thought and method for well repair operation of dense perforation of the long vertical well section gas storage.
Specifically, the following technical scheme is adopted:
a temporary plugging operation method of a long straight well section gas storage comprises the following steps:
injecting well-killing liquid into the sleeve, and performing well-killing construction operation of an injection production well;
in the well-killing construction process of the injection and production well, a long-acting temporary plugging agent is put into a sleeve, meanwhile, the temporary plugging construction pressure change is monitored, when the temporary plugging construction pressure does not rise obviously, the short-acting temporary plugging agent is put in place, the injection displacement of the well-killing liquid is controlled through displacement of the well-killing liquid, the temporary plugging construction pressure change is observed, and when the temporary plugging construction pressure rises obviously, the temporary plugging construction operation of the injection and production well is completed;
in the process of injection and production well killing construction, if an oil pipe at a wellhead of the injection and production well is not communicated with a sleeve, a steel wire operation is carried out to open an underground sliding sleeve, degassing between the sleeve and a gas storage is carried out for a preset time in a circulating way of killing fluid, in the process of injection and production well killing construction, a long-acting temporary plugging agent is replaced to the sliding sleeve in the killing fluid of the injection and production well killing construction, a sleeve gate is closed to be extruded positively, the discharge capacity is controlled, and the temporary plugging construction pressure change is monitored;
in the process of injection well killing construction operation and injection well temporary plugging construction operation, if an oil pipe at the wellhead of the injection well is in series connection with a sleeve, the injection well is constructed in a strong extrusion mode, a killing well hydraulic well is firstly introduced, then a long-acting temporary plugging agent is extruded to implement temporary plugging killing, the displacement is controlled, and the temporary plugging construction pressure change is monitored.
In the temporary plugging operation method of the long vertical well section gas storage, as an optional implementation mode of the invention, in the well killing operation process of the injection and production well, the oil pipe at the wellhead of the injection and production well is not in communication with the sleeve,
in the temporary plugging construction process of the injection production well, the long-acting temporary plugging agent is replaced in the well control fluid of the injection production well control construction operation to the sliding sleeve, the sleeve gate is closed to be extruded positively, the displacement is controlled, the temporary plugging construction pressure change is monitored, if the temporary plugging construction pressure rises to exceed the preset pressure upper limit value, the pump is stopped to observe the temporary plugging construction pressure drop condition, when the temporary plugging construction pressure drops to the preset pressure lower limit value, the pump is started again to inject the long-acting temporary plugging agent, and the operation is repeated until the temporary plugging construction pressure does not rise obviously, and the long-acting temporary plugging agent is put in.
In the temporary plugging operation method of the long vertical well section gas storage, after the temporary plugging operation of the injection and production well is completed, well control liquid circulates to be free of overflow, leakage and gas, the sleeve is opened for standing observation, the well control liquid circulates again, leakage and gas invasion conditions are recorded, and if enough safe time is confirmed, the wellhead installation blowout preventer stack is disassembled.
In the temporary plugging operation method of the long vertical well section gas storage, if the oil pipe at the wellhead of the injection and production well is not in series with the casing, a blanking plug is put in the steel wire operation, whether the production pipe string of the injection and production well leaks or not and whether the packer is out of seal is verified by positive pressing, the change condition of the casing pressure is observed, and if the casing pressure fluctuates along with the oil pressure, the packer is not out of seal; if the oil pipe is not pressed down, the oil pipe string is well sealed.
In the temporary plugging operation method of the long vertical well section gas storage, in the process of injection well killing operation and injection well temporary plugging operation, an oil pipe at a wellhead of the injection well is communicated with a sleeve, if the temporary plugging operation pressure rises above a preset pressure upper limit value, a pump is stopped to observe the condition of the temporary plugging operation pressure, when the temporary plugging operation pressure falls to a preset pressure lower limit value, the pump is started again to inject the long-term temporary plugging agent, and the method is repeated until the temporary plugging operation pressure does not rise obviously, and the long-term temporary plugging agent is put.
In the temporary plugging operation method of the long vertical well section gas storage, after the temporary plugging construction operation of the injection well is completed, the pressure drop condition of the sleeve is observed, and when the pressure of the sleeve is reduced to the lower limit value of the preset sleeve pressure, an oil pipe valve and a sleeve valve are opened to empty the gas accumulated in the well; and standing for observation, recording overflow or leakage conditions, pressing again to record the pressure rise condition of the casing, evaluating the well control effect, and confirming that enough safe time exists, and disassembling the wellhead to install the blowout preventer stack.
In the temporary plugging operation method of the long vertical well section gas storage, after the temporary plugging construction operation of the injection well is completed, well-killing liquid is introduced for circulating well flushing and degassing, leakage and gas invasion conditions are recorded, and after no overflow and no leakage exist, the production string of the injection well above the packer is started.
In the temporary plugging operation method of the long vertical well section gas storage, after the temporary plugging construction operation of the injection and production well is completed, a packer is sleeved, milled and salvaged to lower the production string of the injection and production well, leakage and gas invasion conditions are recorded in the construction process, and temporary plugging and fixation are carried out by adopting the circulation of well control liquid and short-term temporary plugging agents or extruding the short-term temporary plugging agents into leakage points.
In the temporary plugging operation method of the long vertical well section gas storage, the underground safety valve is closed, the production gate is opened, the oil pressure and the casing pressure change are observed, whether the production string of the injection well leaks or not and whether the packer is out of seal are judged, and if the production string of the injection well leaks or the packer is out of seal, the casing annulus is filled.
As an optional implementation mode of the invention, in the temporary plugging operation method of the long-straight-well section gas storage, the self-degradation time of the long-acting temporary plugging agent is longer than that of the short-acting temporary plugging agent;
according to the reservoir environment and construction requirements, selecting a long-acting temporary plugging agent to plug large tunnels and perforation holes of a stratum; according to the leakage condition in the temporary plugging construction operation process, a short-acting temporary plugging agent is added circularly to plug the leakage in the construction period.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a temporary plugging operation method of a long straight well section gas storage, wherein in the method, a long-acting temporary plugging agent with good grading is selected to plug large pore canals and perforation holes of a stratum according to the environment of a reservoir and construction requirements; then, according to the leakage condition in the temporary plugging construction operation process of the injection and production well, short-acting temporary plugging particles are added in a circulating manner to plug the leakage in the construction period; finally, after the temporary plugging construction operation of the injection and production well is completed, the long-acting temporary plugging agent and the short-acting temporary plugging agent can be automatically degraded in the well, and hydrolysis can be accelerated by adding HCl. The invention provides a composite temporary blocking safety operation method for effectively blocking a long straight well section gas storage, and provides a new thought and method for well repair operation of dense perforation of the long straight well section gas storage.
Drawings
FIG. 1 is a flow chart of a temporary plugging operation method of a long straight well section gas storage according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an underground production string of an injection well of a long vertical well section gas storage;
FIG. 3 is a schematic construction diagram of a temporary plugging method for a long straight well section gas storage according to an embodiment of the present invention.
Reference numerals in the drawings illustrate: 1-a sleeve 2-an oil pipe 3-an underground safety valve 4-an underground sliding sleeve 5-a first setting nipple 6-a packer 7-an anti-seize antifriction device 8-a second setting nipple 9-a bell mouth and a ball seat 10-an artificial well bottom 11-a perforation 12-a well mouth 13-a long-acting temporary plugging agent 14-a short-acting temporary plugging agent 15-an underground reservoir.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship conventionally put in use of the inventive product, or an azimuth or a positional relationship conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Referring to fig. 1, a temporary plugging operation method for a long vertical well section gas storage according to this embodiment includes:
injecting well-killing liquid into the sleeve, and performing well-killing construction operation of an injection production well;
in the well-killing construction process of the injection and production well, a long-acting temporary plugging agent is put into a sleeve, meanwhile, the temporary plugging construction pressure change is monitored, when the temporary plugging construction pressure does not rise obviously, the short-acting temporary plugging agent is put in place, the injection displacement of the well-killing liquid is controlled through displacement of the well-killing liquid, the temporary plugging construction pressure change is observed, and when the temporary plugging construction pressure rises obviously, the temporary plugging construction operation of the injection and production well is completed;
in the process of injection and production well killing construction, if an oil pipe at a wellhead of the injection and production well is not communicated with a sleeve, a steel wire operation is carried out to open an underground sliding sleeve, degassing between the sleeve and a gas storage is carried out for a preset time in a circulating way of killing fluid, in the process of injection and production well killing construction, a long-acting temporary plugging agent is replaced to the sliding sleeve in the killing fluid of the injection and production well killing construction, a sleeve gate is closed to be extruded positively, the discharge capacity is controlled, and the temporary plugging construction pressure change is monitored;
in the process of injection well killing construction operation and injection well temporary plugging construction operation, if an oil pipe at the wellhead of the injection well is in series connection with a sleeve, the injection well is constructed in a strong extrusion mode, a killing well hydraulic well is firstly introduced, then a long-acting temporary plugging agent is extruded to implement temporary plugging killing, the displacement is controlled, and the temporary plugging construction pressure change is monitored.
The embodiment provides a temporary plugging operation method of a long straight well section gas storage, wherein long-acting temporary plugging agents with good grading are selected to plug large pore canals and perforation holes of a stratum according to the environment of a reservoir and construction requirements; then, according to the leakage condition in the temporary plugging construction operation process of the injection and production well, short-acting temporary plugging particles are added in a circulating manner to plug the leakage in the construction period; finally, after the temporary plugging construction operation of the injection and production well is completed, the long-acting temporary plugging agent and the short-acting temporary plugging agent can be automatically degraded in the well, and hydrolysis can be accelerated by adding HCl. The embodiment provides a composite temporary blocking safety operation method for effectively blocking the long straight well section gas storage, and provides a new thought and method for well repair operation of dense perforation of the long straight well section gas storage.
In the temporary plugging operation method of the long vertical well section gas storage of the embodiment, if the oil pipe at the wellhead of the injection well is not in communication with the casing during the injection well killing operation, the steel wire operation is carried out to open the underground sliding sleeve, and the killing fluid circulates for a preset time to degas the space between the casing and the gas storage;
in the temporary plugging construction process of the injection production well, the long-acting temporary plugging agent is replaced in the well control fluid of the injection production well control construction operation to the sliding sleeve, the sleeve gate is closed to be extruded positively, the displacement is controlled, the temporary plugging construction pressure change is monitored, if the temporary plugging construction pressure rises to exceed the preset pressure upper limit value, the pump is stopped to observe the temporary plugging construction pressure drop condition, when the temporary plugging construction pressure drops to the preset pressure lower limit value, the pump is started again to inject the long-acting temporary plugging agent, and the operation is repeated until the temporary plugging construction pressure does not rise obviously, and the long-acting temporary plugging agent is put in.
Further, according to the temporary plugging operation method of the long straight well section gas storage, the well killing effect under the condition that the wellhead oil pipe and the casing pipe of the injection and production well are not in communication is evaluated: after the temporary plugging construction operation of the injection and production well is completed, the well killing liquid is circulated until no overflow, no leakage and no gas are caused, the sleeve is opened for standing observation, the well killing liquid is circulated again, the leakage and gas invasion conditions are recorded, and the condition that enough safe time exists is confirmed, so that the wellhead installation blowout preventer stack is disassembled.
In the temporary plugging operation method of the long straight well section gas storage, if the oil pipe at the wellhead of the injection and production well is not in communication with the sleeve, the steel wire operation is carried out into the packer, whether the production pipe string of the injection and production well leaks or not and whether the packer is out of seal or not is verified by normal pressing, the change condition of the casing pressure is observed, and if the casing pressure fluctuates along with the oil pressure, the packer is not out of seal; if the oil pipe is not pressed down, the oil pipe string is well sealed.
In the temporary plugging operation method of the long vertical well section gas storage of the embodiment, if the well head oil pipe of the injection well is in series connection with the casing pipe and the well killing liquid cannot establish circulation in the injection well killing operation and the injection well temporary plugging operation, the forced extrusion mode is adopted for construction, the well killing liquid is firstly introduced, then the long-acting temporary plugging agent is extruded for implementing temporary plugging killing, the displacement is controlled, the temporary plugging operation pressure change is monitored, if the temporary plugging operation pressure rises above the preset pressure upper limit value, the pump is stopped for observing the temporary plugging operation pressure drop condition, and when the temporary plugging operation pressure drops below the preset pressure lower limit value, the pump is started again for injecting the long-acting temporary plugging agent, so the operation is repeated until the temporary plugging operation pressure does not rise obviously, and the long-acting temporary plugging agent is put in.
Further, according to the temporary plugging operation method of the long straight well section gas storage, the well killing effect under the condition that the oil pipe at the wellhead of the injection and production well is in series communication with the casing is evaluated: after the temporary plugging construction operation of the injection well is completed, observing the pressure drop condition of the sleeve, and opening an oil pipe valve and a sleeve valve when the sleeve pressure drops to a preset lower limit value of the sleeve pressure to empty the gas accumulation in the well; and standing for observation, recording overflow or leakage conditions, pressing again to record the pressure rise condition of the casing, evaluating the well control effect, and confirming that enough safe time exists, and disassembling the wellhead to install the blowout preventer stack.
According to the temporary plugging operation method for the long straight well section gas storage, after the temporary plugging construction operation of the injection and production well is completed, well control liquid is introduced for circulating well flushing and degassing, leakage and gas invasion conditions are recorded, and after the gas is not overflowed, leakage and gas are avoided, the production string of the injection and production well above the packer is started.
According to the temporary plugging operation method for the long vertical well section gas storage, after the temporary plugging construction operation of the injection and production well is completed, a packer is sleeved, milled and salvaged, a production string of the injection and production well is placed below the packer, leakage and gas invasion conditions are recorded in the construction process, well control liquid and short-term temporary plugging agent circulation are adopted, or the short-term temporary plugging agent is extruded to enter a leakage point, and temporary plugging and fixation are carried out.
In the temporary plugging operation method of the long straight well section gas storage, before injection well killing operation and injection well temporary plugging operation are carried out, an underground safety valve is closed, a production gate is opened, oil pressure and casing pressure changes are observed, whether the injection well production string leaks or not and whether a packer is out of seal is judged, and if the injection well production string leaks or the packer is out of seal, a casing annulus is filled.
In the temporary plugging operation method of the long-straight-well section gas storage, the self-degradation time of the long-acting temporary plugging agent is longer than that of the short-acting temporary plugging agent;
according to the reservoir environment and construction requirements, selecting a long-acting temporary plugging agent to plug large tunnels and perforation holes of a stratum; according to the leakage condition in the temporary plugging construction operation process, a short-acting temporary plugging agent is added circularly to plug the leakage in the construction period.
Specifically, the long-acting temporary plugging agent of the embodiment has larger particle size, is mainly used for plugging large pore canals and perforation holes of a stratum, has smaller particle size, can be used for plugging fine pores, and can effectively plug dense perforations of a long-straight-well section gas storage through a composite plugging mode of the long-acting temporary plugging agent and the short-acting temporary plugging agent.
The invention provides a novel method for carrying out efficient temporary plugging on an injection and production well of a long vertical well section gas storage so as to safely repair the well. After the actual inspection, the obtained result accords with the expected result, which shows that the method is effective and provides a brand new thought and method for the old well reconstruction in the gas storage construction.
Referring to fig. 2, an underground production string of an injection well of a long vertical well section gas storage of the embodiment is illustrated, the underground production string comprises a casing 1 and an oil pipe 2 arranged in the casing 1, wherein the oil pipe 2 is sequentially provided with an underground safety valve 3, an underground sliding sleeve 4, a first landing nipple 5, a packer 6, an anti-blocking antifriction device 7, a second landing nipple 8 and a bell mouth+ball seat 9 from top to bottom, the casing 1 penetrates into a stratum, an artificial well bottom 10 is formed at the bottommost end of the casing 1, the casing 1 is communicated with the gas storage through perforation holes 11, and the temporary plugging operation method of the long vertical well section gas storage of the embodiment is to plug the perforation holes 11 communicated between the casing 1 and the gas storage so as to perform well repairing operation of the injection well section gas storage.
Referring to fig. 3, a construction schematic diagram of a temporary plugging operation method of a long vertical well section gas storage in this embodiment is that a long-acting temporary plugging agent 13 and a short-acting temporary plugging agent 14 are injected into a well mouth 12 of an injection well, the long-acting temporary plugging agent 13 plugs a perforation 11 in an underground reservoir 15, which is communicated with a sleeve 1, and the short-acting temporary plugging agent 14 is used for plugging the temporary plugging of the long-acting temporary plugging agent 13 after construction.
Example 1
The temporary plugging operation method of the long straight well section gas storage comprises the following steps:
step one: and preparing construction materials, and finishing screening of the types of the temporary plugging agents with long and short effects and evaluating the temporary plugging performance according to reservoir environment and construction requirements.
Step two: before well repair operation, the underground safety valve is closed, the production gate is opened, the oil pressure and the sleeve pressure change are observed, and whether the wellhead oil pipe and the sleeve are in series connection is judged. If the wellhead oil pipe and the sleeve are not communicated, adopting a circulating well killing mode firstly, and then replacing the long-acting temporary plugging agent HC2108, and constructing in a forced extrusion mode; if the wellhead oil pipe and the sleeve are communicated, the construction is needed to be carried out in a forced extrusion mode; implementing the annular liquid level of the sleeve before construction, if the annular liquid level is deeper, the possibility of leakage of underground production pipe strings or loss of sealing of the packer is not eliminated. The annulus should be filled before step three is performed.
Step three: and in the second step, judging that the wellhead oil pipe and the casing are not in series, then the wire operation is carried out to put into the blanking plug, and the normal pressing is used for verifying whether the underground production pipe string leaks and whether the packer is in a loose state. If the underground production pipe string is not sealed, the change condition of the casing pressure is observed, and if the casing pressure obviously fluctuates along with the oil pressure, the possibility of the packer losing seal is small; if the oil pipe is not pressed down, the oil pipe string is well sealed, and the reason that the oil pipe and the casing are in series can be basically determined to be the loss of the sealing of the packer; annulus pressuring further validates the packer.
Step four: in the second step, under the condition that the wellhead oil pipe and the sleeve are not in communication, the underground sliding sleeve is opened in the steel wire operation, and the well killing fluid is circulated for two weeks for degassing. And the long-acting temporary plugging agent HC2108 20m with the concentration of 5% is positively replaced to the underground sliding sleeve. And (5) closing the sleeve gate to squeeze forward, controlling the displacement, and observing the pressure change. If the construction pressure obviously rises to 8-10Mpa, stopping the pump to observe the pressure drop. This is repeated 2-3 times. If the pressure does not have obvious rising process, a certain amount of short-acting temporary plugging agent GA1506 is added, well control fluid is used for displacing in place, the discharge capacity is controlled, the pressure change is observed, and the next working procedure is carried out after the pressure is obviously raised. In the second step, the wellhead oil pipe and the sleeve are judged to be communicated, and the circulation cannot be established, so that the construction can only be carried out in a forced extrusion mode. The well is forced to be pumped by the well-pumping liquid, then the long-acting temporary plugging agent HC2108 is squeezed into the well to implement temporary plugging well-pumping, the discharge capacity is controlled, the pressure is observed, the pressure is obviously increased to 8-10Mpa, and the pressure drop condition is observed when the pump is stopped. This is repeated 2-3 times.
Step five: and in the fourth step, if the construction is carried out under the condition that the wellhead oil pipe and the casing pipe are not in communication, the well is killed by using well killing liquid for circulation and degassing, after the well killing liquid is circulated until no overflow and no leakage are caused, the well is static and observed for 12 hours, leakage and gas invasion conditions are recorded again in a circulating way, and enough safe time is ensured, and the wellhead is disassembled to install the blowout preventer stack. In the fourth step, if the construction is performed under the condition of the string connection of the wellhead oil pipe and the sleeve, the pressure drop condition is observed, and when the pressure drops below 1Mpa, an oil sleeve valve is opened to empty the accumulated gas in the well. After 12 hours of silence, overflow or leakage is recorded. And (4) comparing the recorded pressure rising condition of the forward pressing with the previous construction, evaluating the well-killing effect, and detaching the wellhead installation blowout preventer stack after confirming that the safety time is enough.
Step six: and (3) carrying out well flushing and degassing by using well killing liquid circulation, recording leakage and gas invasion conditions, and after no overflow, no leakage and no gas, lifting out the production pipe string above the packer to finish the plug-in sealing operation.
Step seven: the production pipe column below the packer is sleeved, milled and salvaged, leakage and GAs invasion conditions are recorded at any time in the construction process, and a temporary plugging agent GA1506 is adopted for circulating by 5% of well control fluid or is extruded to enter a leakage point when needed, so that the temporary plugging and well control effect is ensured, and the safety production is ensured.
Example two
On the basis of the first embodiment, temporary plugging operation is completed for the target well. After the temporary plugging operation is completed, closing the target well for about 45 days, wherein the temporary plugging agent is self-degraded; if the degradation process is required to be completed in advance, HCl solution can be added into the well to accelerate the hydrolysis of the temporary plugging agent, and finally the temporary plugging and well repairing operation is completed.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be included in the scope of the appended claims.
Claims (4)
1. A temporary plugging operation method of a long straight well section gas storage is characterized by comprising the following steps:
injecting well-killing liquid into the sleeve, and performing well-killing construction operation of an injection production well;
in the well-killing construction process of the injection and production well, a long-acting temporary plugging agent is put into a sleeve, meanwhile, the temporary plugging construction pressure change is monitored, when the temporary plugging construction pressure does not rise obviously, the short-acting temporary plugging agent is put in place, the injection displacement of the well-killing liquid is controlled through displacement of the well-killing liquid, the temporary plugging construction pressure change is observed, and when the temporary plugging construction pressure rises obviously, the temporary plugging construction operation of the injection and production well is completed;
in the process of injection well killing construction, if an oil pipe at the wellhead of the injection well is not communicated with a sleeve, the underground sliding sleeve is opened by steel wire operation, degassing between the sleeve and a gas storage is carried out by killing fluid circulation for a preset time, a long-acting temporary plugging agent is replaced in killing fluid of injection well killing construction to the sliding sleeve in the process of injection well temporary plugging construction, a sleeve gate is closed to be extruded positively, the discharge capacity is controlled, and the temporary plugging construction pressure change is monitored; in the temporary plugging construction operation process of the injection and production well, if the temporary plugging construction pressure rises above the preset pressure upper limit value, stopping the pump to observe the descending condition of the temporary plugging construction pressure, and when the temporary plugging construction pressure descends to the preset pressure lower limit value, starting the pump again to inject the long-acting temporary plugging agent, repeating the steps until the temporary plugging construction pressure does not rise obviously, and ending the long-acting temporary plugging agent injection; after the temporary plugging construction operation of the injection and production well is completed, after the well killing liquid circulates to be free of overflow, leakage and gas, standing and observing the open sleeve, circulating the well killing liquid again, recording leakage and gas invasion conditions, and confirming that enough safe time exists, and disassembling the wellhead to install the blowout preventer stack; the steel wire operation is carried out, a blanking plug is put in, whether the production string of the injection and production well leaks or not and whether the packer is out of seal or not is verified by positive pressing, the change condition of the casing pressure is observed, and if the casing pressure fluctuates along with the oil pressure, the packer is not out of seal; if the oil pipe is not pressed down, the oil pipe string is well sealed;
in the process of carrying out injection well killing construction operation and injection well temporary plugging construction operation, if an oil pipe at the wellhead of the injection well is in series connection with a sleeve, adopting a strong extrusion mode for construction, firstly introducing a killing hydraulic well, then extruding a long-acting temporary plugging agent to implement temporary plugging killing, controlling the discharge capacity, and monitoring the pressure change of temporary plugging construction; in the process of injection well killing construction operation and injection well temporary plugging construction operation, if the temporary plugging construction pressure rises above the preset upper pressure limit value, stopping the pump to observe the descending condition of the temporary plugging construction pressure, and when the temporary plugging construction pressure descends to the preset lower pressure limit value, restarting pumping the long-acting temporary plugging agent, repeating the steps until the temporary plugging construction pressure does not rise obviously, and ending the long-acting temporary plugging agent throwing; after the temporary plugging construction operation of the injection well is completed, observing the pressure drop condition of the sleeve, and opening an oil pipe valve and a sleeve valve when the sleeve pressure drops to a preset lower limit value of the sleeve pressure to empty the gas accumulation in the well; standing for observation, recording overflow or leakage conditions, pressing again to record the pressure rising condition of the casing, evaluating the well control effect, and detaching the wellhead and installing the blowout preventer stack if enough safe time is confirmed;
the self-degradation time of the long-acting temporary plugging agent is longer than that of the short-acting temporary plugging agent; according to the reservoir environment and construction requirements, selecting a long-acting temporary plugging agent to plug large tunnels and perforation holes of a stratum; according to the leakage condition in the temporary plugging construction operation process, a short-acting temporary plugging agent is added circularly to plug the leakage in the construction period.
2. The temporary plugging operation method for the long straight well section gas storage according to claim 1, wherein after the temporary plugging construction operation of the injection and production well is completed, well-killing liquid is introduced for circulating well flushing and degassing, leakage and gas invasion conditions are recorded, and after no overflow, no leakage and no gas exist, the production string of the injection and production well above the packer is lifted.
3. The temporary plugging operation method for the long vertical well section gas storage according to claim 2, wherein after the temporary plugging construction operation of the injection and production well is completed, a packer is sleeved, milled and salvaged to lower the production string of the injection and production well, leakage and gas invasion conditions are recorded in the construction process, and temporary plugging and fixation is carried out by adopting a well control fluid and a short-term temporary plugging agent to circulate or extruding the short-term temporary plugging agent into a leakage point.
4. The temporary plugging operation method for the long vertical well section gas storage according to claim 1, wherein before injection well killing operation and injection well temporary plugging operation are carried out, a downhole safety valve is closed, a production gate is opened, oil pressure and casing pressure changes are observed, whether the injection well production string leaks or not and whether a packer is out of seal are judged, and if the injection well production string leaks or the packer is out of seal, a casing annulus is filled.
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