CN117127920A - Multi-stage gas injection and brine discharge method for drilling and discharging integrated tubular column and salt cavern gas storage - Google Patents
Multi-stage gas injection and brine discharge method for drilling and discharging integrated tubular column and salt cavern gas storage Download PDFInfo
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- CN117127920A CN117127920A CN202210550816.6A CN202210550816A CN117127920A CN 117127920 A CN117127920 A CN 117127920A CN 202210550816 A CN202210550816 A CN 202210550816A CN 117127920 A CN117127920 A CN 117127920A
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- 239000012267 brine Substances 0.000 title claims abstract description 214
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 214
- 238000007599 discharging Methods 0.000 title claims abstract description 117
- 238000005553 drilling Methods 0.000 title claims abstract description 94
- 150000003839 salts Chemical class 0.000 title claims abstract description 55
- 238000002347 injection Methods 0.000 title claims abstract description 53
- 239000007924 injection Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003860 storage Methods 0.000 title claims abstract description 39
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 87
- 150000002367 halogens Chemical class 0.000 claims abstract description 87
- 210000002445 nipple Anatomy 0.000 claims abstract description 50
- 239000002245 particle Substances 0.000 claims abstract description 18
- 238000004090 dissolution Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 76
- 230000008569 process Effects 0.000 description 20
- 206010006223 Breast discharge Diseases 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Chemical group 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
-
- 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
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a multi-stage gas injection and brine discharge method for a drilling and brine discharge integrated pipe column and a salt cavern gas storage. The drilling and discharging integrated pipe column comprises a drill bit, a drilling tool, a first halogen discharging device, a second halogen discharging device and a halogen discharging pipe column which are sequentially arranged from bottom to top; the pipe wall of the first brine discharge device is provided with a first bypass hole, the first bypass hole is plugged by a patch, and the dissolution time of the patch in brine is greater than a set time threshold; the second brine discharge device comprises at least one section brine discharge nipple, the brine discharge nipple is provided with a switch, a second bypass hole is arranged on the pipe wall, and the second bypass hole is controlled to be communicated or not communicated with the outside through opening or closing of the switch. The drilling of residues in the salt cavern gas storage and the effective discharge of brine above the residue surface, brine in the residues and small residue particles can be realized, and the effective storage volume and comprehensive economic benefit of the gas storage are improved.
Description
Technical Field
The invention relates to the technical field of gas storage well completion, in particular to a drilling and discharging integrated tubular column and a multi-stage gas injection and halogen discharge method for a salt cavern gas storage.
Background
Many countries around the world are developing salt cavern gas reservoirs, and the history of using salt caverns as gas reservoirs can be traced to the early 20 th century during the second war. Because foreign salt layers are high in purity, insoluble matter accumulation bodies of the salt rock gas storage are often fewer, and researches are concentrated on the aspects of salt rock construction and site selection technology, salt layer drilling and completion technology, salt rock cavity filtering and washing technology, salt rock cavity shape control technology, salt rock cavity stability technology and the like, no related technologies such as drilling holes in residues, multi-stage brine discharge and gas storage space expansion, brine discharge pipe column residue blockage prevention and the like exist at present.
The characteristics of more salt shale interlayers, higher content of insoluble impurities and the like in China often lead to larger insoluble matter accumulation bodies, and the content of insoluble matters in partial areas can even reach more than 50 percent. The existence of the piled matters wastes a considerable part of the volume of the warehouse, and brings potential safety hazards for subsequent gas injection, halogen removal and underground operation. Therefore, the formation mechanism of salt insoluble residues, the void volume of the piled matters, the sedimentation rule of insoluble residue particles in brine, the treatment of salt cavity residual brine, the pore formation of residue piled matters and the like are researched by domestic part scholars, but the drilling process of residues without diagenetic at the bottom of the cavity and the brine discharging process in the residues are still in an exploration stage.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a drilling and drainage integrated pipe column and a multi-stage gas injection and brine drainage method for a salt cavern gas storage, which overcome or at least partially solve the above problems, and achieve drilling of residues in the salt cavern gas storage and effective drainage of brine above the residue surface, brine in the residues and small residue particles, and improve the effective storage volume and comprehensive economic benefits of the gas storage.
In a first aspect, an embodiment of the invention provides a drilling and discharging integrated pipe column, which comprises a drill bit, a drilling tool, a first halogen discharging device, a second halogen discharging device and a halogen discharging pipe column which are sequentially arranged from bottom to top;
the wall of the first brine discharge device is provided with a first side through hole, the first side through hole is plugged by a patch, the patch can be dissolved in brine, and the dissolution time is longer than a set time threshold;
the second brine discharge device comprises at least one section brine discharge nipple, the brine discharge nipple is provided with a switch, a second bypass hole arranged on the pipe wall of the brine discharge nipple is communicated with the outside in the state that the switch is opened, and the second bypass hole is not communicated with the outside in the state that the switch is closed.
In a second aspect, an embodiment of the present invention provides a method for multi-stage gas injection and brine discharge of a salt cavern gas storage, including the following steps performed by the above drilling and brine discharge integrated pipe column:
the drilling and discharging integrated pipe column is put into the production pipe column to drill residues at the bottom of the salt cavern gas storage;
determining a brine discharge nipple of the drilling and discharging integrated pipe column, which is positioned below a brine surface and in a region from a first set depth to a position above a residue surface, as an effective brine discharge nipple, turning on a switch of the effective brine discharge nipple, performing gas injection brine discharge operation until the distance between the uppermost effective brine discharge nipple and the brine surface reaches the first set distance, suspending gas injection brine discharge operation, and turning off the switch of the effective brine discharge nipple;
if the effective halogen discharge pup joint is more than one section, the gas injection halogen discharge operation is resumed until the distance between the other effective halogen discharge pup joint and the brine surface reaches the first set distance, and the suspended gas injection halogen discharge operation is returned to be executed until the switches of all the effective halogen discharge pup joints are closed;
continuing gas injection and brine discharge operation, and discharging partial particles and brine in the residue to the ground through the first brine discharge device.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
(1) The drilling and discharging integrated pipe column provided by the embodiment of the invention comprises a drill bit, a drilling tool, a first halogen discharging device, a second halogen discharging device and a halogen discharging pipe column which are sequentially arranged from bottom to top. The drill bit and the drilling tool are arranged, so that the drilling of residues in the salt cavern gas storage can be realized; the wall of the first brine discharge device is provided with a first side through hole, the first side through hole is plugged by a patch, the patch can be dissolved in brine, and the dissolution time is longer than a set time threshold, so that the first brine discharge device is not communicated with the outside in the residue drilling process, the patch is completely dissolved when brine is discharged from the residue, and the first side through hole becomes an effective channel for discharging brine and small residue particles in the residue; the second brine discharging device comprises at least one section of brine discharging nipple, the brine discharging nipple is provided with a switch, a second bypass hole arranged on the pipe wall of the brine discharging nipple is communicated with the outside under the state that the switch is opened, the second bypass hole is not communicated with the outside under the state that the switch is closed, the second brine discharging device is not communicated with the outside in the residue drilling process, and when brine above the residue surface is discharged, the switch is opened to enable the second bypass hole to be an effective passage for brine discharging.
(2) According to the multi-stage gas injection and brine discharge method for the salt cavern gas storage, provided by the embodiment of the invention, not only can brine above the residue surface be discharged, but also part of brine and small particles in the residue can be discharged, and compared with a conventional gas injection and brine discharge process, the effective gas storage space of the salt cavern gas storage can be enlarged by 14% -18%, so that the working capacity and economic benefit of a salt cavity are greatly improved; when the old cavity of the salt mine high-residue brine-producing well is reformed and utilized, the effective space volume of the cavity can be increased by 25% -33%, the time for dissolving brine to manufacture the cavity can be greatly shortened, and a large amount of warehouse-building cost can be saved, so that the reformation and utilization of the old cavity of the salt mine high-residue brine-producing well can be promoted, the development and construction of a salt cavern gas storage can be promoted, and the economic and social benefits are great.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a drill string integrated tubular column according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for gas injection and brine discharge of a salt cavern gas storage according to a second embodiment of the invention;
FIG. 3 is a schematic diagram of a gas-driven brine-discharging operation using a three-stage brine-discharging nipple in a second embodiment of the invention;
FIG. 4 is a schematic diagram of a gas-driven brine-discharging operation using second-stage and third-stage brine-discharging pups in a second embodiment of the invention;
FIG. 5 is a schematic diagram illustrating gas-driven brine-discharging operation using a third-stage brine-discharging nipple in a second embodiment of the invention;
FIG. 6 is a schematic diagram illustrating the operation of gas-driven brine discharge by using the first stage brine discharge device according to the second embodiment of the present invention;
FIG. 7 is a schematic diagram of a conventional gas injection and brine removal process.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
In the description of the present invention, the terms "comprising," "including," "having," "containing," and the like are open-ended terms, meaning including, but not limited to. Furthermore, the terms "first," "second," and "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the problem that effective drilling of residues in the salt cavern gas storage and effective discharge of brine above the residue surface, brine in the residues and small residue particles in the residues cannot be realized in the prior art, the embodiment of the invention provides a drilling and discharging integrated tubular column and a multi-stage gas injection and halogen discharge method for the salt cavern gas storage, which can realize the drilling of the residues in the salt cavern gas storage and the effective discharge of the brine above the residue surface, the brine in the residues and the small residue particles, and improve the effective storage volume and comprehensive economic benefit of the gas storage.
Example 1
The first embodiment of the invention provides a drilling and discharging integrated pipe column, the structure of which is shown in fig. 1, and the drilling and discharging integrated pipe column comprises a drill bit 1, a drilling tool 2, a first halogen discharging device 3, a second halogen discharging device and a halogen discharging pipe column 5 which are sequentially arranged from bottom to top.
The first side through holes are formed in the pipe wall of the first brine discharge device 3, the first side through holes are plugged by the patches, and the patches can be dissolved in brine. The dissolution time of the patch in the brine is greater than a set time threshold, so that the patch cannot be dissolved in advance in the drilling process, the set time threshold can be reasonably set according to factors such as the predicted drilling time, the safety time, the brine discharge time of the brine above the residue surface and the like, and the soluble patch with matched materials is selected according to the set time threshold.
The soluble patch has enough compressive strength, tensile strength, shearing strength and other strength, can ensure that leakage can not occur when the drilling and discharging integrated tubular column drills along the residue, and the first halogen discharging device can not break or fall off when the drill bit encounters clamping brake, so that the implementation of the drilling and discharging integrated tubular column drilling process along the residue is not influenced. The patch can be completely self-dissolved after a certain time in the brine, and after the patch is self-dissolved, the first bypass hole on the pipe wall of the first brine discharge device can be kept smooth, so that a liquid inlet channel is provided for discharging the brine and small residue particles in the residue.
The second brine discharging device comprises at least one section brine discharging nipple (taking three sections brine discharging nipple as an example in fig. 1, namely a first-stage brine discharging nipple 41, a second-stage brine discharging nipple 42 and a third-stage brine discharging nipple 43 respectively), the brine discharging nipple is provided with a switch, a second bypass hole arranged on the pipe wall of the brine discharging nipple is communicated with the outside in a state that the switch is opened, and the second bypass hole is not communicated with the outside in a state that the switch is closed.
The brine discharge nipple is a brine discharge device capable of being repeatedly opened and closed, and any brine discharge nipple can be closed or opened as required; meanwhile, the repeated switching of the brine discharge pup joint can reduce the occurrence probability of blockage of the second bypass hole by crystallized substances after being soaked in brine for a long time.
The brine discharge nipple capable of being repeatedly opened and closed is generally provided with 3-4 stages (sections), because uncertainty exists in the drilling depth of the drilling and discharging integrated tubular column along the cavity bottom residue, and the installation position of the multi-stage brine discharge nipple on the drilling and discharging integrated tubular column is optimized, so that at least one liquid discharge channel of the brine discharge nipple can be close to the residue surface, and brine above the residue surface is discharged to the ground through the brine discharge nipple close to the residue surface.
In some embodiments, the halogen discharge pup joint comprises an inner cylinder and an outer cylinder, and the upper part of the inner cylinder is connected with a ball throwing switch; in the state that the switch is opened, a second bypass hole on the wall of the inner cylinder and a second bypass hole on the wall of the outer cylinder have an overlapped part, namely, the halogen discharge nipple is communicated with the outside through the second bypass hole; and in the state that the switch is closed, no overlapping part exists between the second bypass hole on the inner cylinder pipe wall and the second bypass hole on the outer cylinder pipe wall, namely the halogen discharge nipple is not communicated with the outside.
Preferably, the positions, the shapes and the sizes of the second bypass holes on the inner cylinder pipe wall and the outer cylinder pipe wall are matched, and the second bypass holes on the inner cylinder pipe wall and the second bypass holes on the outer cylinder pipe wall can be completely overlapped in the state that the switch is opened.
Further, the ball throwing switch comprises a spring, a reset mechanism and a ball seat which are sequentially arranged from bottom to top.
The ball seat can be in a hollow hemispherical shape, the outer diameter of the ball is matched with the inner diameter of the ball seat by adopting a repeated ball throwing and pressing mode, so that the ball is just pressed on the base, the pressure of the ball plus the pressure of the overlying fluid generated by the ball blockage causes the spring to compress, and the reset mechanism and the inner cylinder are pressed down until the reset mechanism is clamped, at the moment, the switch is in an open state, and an overlapped part exists between a second bypass hole on the wall of the inner cylinder and a second bypass hole on the wall of the outer cylinder; when the switch is required to be closed, a ball with the outer diameter matched with the inner diameter of the ball seat is thrown in, the ball is just pressed on the base, the pressure of the ball and the pressure of the overlying fluid generated by the blockage of the ball enable the spring to reset gradually, the inner cylinder moves upwards under the driving of the reset mechanism, the switch is in a closed state, and the second bypass hole on the wall of the inner cylinder and the second bypass hole on the wall of the outer cylinder do not have an overlapping part.
If the second brine discharging device comprises a plurality of sections of brine discharging pups, the inner diameter of the ball seat of each section of brine discharging pups is from large to small, and the inner diameter difference of the ball seats of two adjacent sections of brine discharging pups is larger than a set inner diameter difference threshold.
The switch of the halogen discharge nipple can be repeatedly switched on and off, and the repeated opening and closing of the second bypass hole on the halogen discharge nipple can be realized by adopting a repeated ball throwing and pressing mode according to construction or operation requirements.
Preferably, the thrown ball can be completely self-dissolved within a certain time without affecting the subsequent operation.
In some embodiments, at least one layer of sand control screen is arranged on the outer wall of the first halogen discharging device and the outer wall of the halogen discharging short section of the second halogen discharging device.
When the brine is discharged, the sand control screen can effectively prevent large-particle-size impurity particles in the brine from blocking the pipe column.
Preferably, the area of the sand control screen is greater than the area of the bypass hole distribution area.
The drilling and discharging integrated pipe column provided by the embodiment of the invention comprises a drill bit, a drilling tool, a first halogen discharging device, a second halogen discharging device and a halogen discharging pipe column which are sequentially arranged from bottom to top. The drill bit and the drilling tool are arranged, so that the drilling of residues in the salt cavern gas storage can be realized; the wall of the first brine discharge device is provided with a first side through hole, the first side through hole is plugged by a patch, the patch can be dissolved in brine, and the dissolution time is longer than a set time threshold, so that the first brine discharge device is not communicated with the outside in the residue drilling process, the patch is completely dissolved when brine is discharged from the residue, and the first side through hole becomes an effective channel for discharging brine and small residue particles in the residue; the second brine discharging device comprises at least one section of brine discharging nipple, the brine discharging nipple is provided with a switch, a second bypass hole arranged on the pipe wall of the brine discharging nipple is communicated with the outside under the state that the switch is opened, the second bypass hole is not communicated with the outside under the state that the switch is closed, the second brine discharging device is not communicated with the outside in the residue drilling process, and when brine above the residue surface is discharged, the switch is opened to enable the second bypass hole to be an effective passage for brine discharging.
In some embodiments, the drill string integrated pipe string further comprises a release 6 arranged at the upper end of the second brine discharging device; and the release 6 is used for lifting the drill string integrated pipe string and comprises the release and the parts above the release when the drill string integrated pipe string fails by releasing.
The multifunctional releasing device is arranged at the top end of the uppermost stage of the integrated tubular column and is a hydraulic releasing device. When the abnormal complex condition occurs underground and all the pipe columns below the multifunctional releasing device or the pipe columns in the cavity are required to be lifted out after the gas injection and halogen discharge operation is finished, the pipe columns can be released by throwing in the control rod to press, and the sliding sleeve downwards opens the locking piece of the multifunctional releasing device. The control rod and the sliding sleeve are locked in the process of lifting the upper pipe column, so that the inside and outside of the integrated pipe column are kept not communicated, and the operation of lifting the pipe column under pressure is realized.
In some embodiments, the drilling and discharging integrated pipe column further comprises a weighted halogen discharging pipe column 7 arranged at the upper end of the first halogen discharging device; the weight per unit length of the added and rearranged halogen column 7 is larger than the weight per unit length of the halogen discharge column.
The arrangement of the added and rearranged halopipe string further provides power for the drill bit to drill within the residue, and may assist in the efficient drilling of the drill bit within the residue.
In some embodiments, the drill bit is a four winged stepped drag bit; the drilling tool is a screw drilling tool.
The four-wing stepped drag bit and the screw drilling tool obtained through repeated experiments are more suitable for drilling residues. The arrangement of the proper drill bit, the drilling tool and the weighted brine-discharging pipe column provides guarantee for the effective drilling of the integrated pipe column in the residues.
The brine discharge pipe column can be a common oil pipe column, and the integrated pipe column is equal to the common oil pipe column when drilling along residues.
A halogen-discharging tubular column section is connected between the first halogen-discharging device and the second halogen-discharging device; if the second brine discharging device comprises a plurality of sections of brine discharging short sections, a brine discharging tubular column section is connected between every two adjacent sections of brine discharging short sections.
Further, the top of the brine discharge pipe column is provided with a safety valve 8.
The drilling and discharging integrated pipe column provided by the embodiment of the invention integrates the functions of drilling holes in the residue efficiently, discharging brine pipe columns deep into the residue to develop multi-stage brine discharge, preventing the pipe columns from being blocked by the residue and the like, and further discharges partial brine and residue particles in the salt cavity and the residue at the bottom of the cavity on the basis of the current gas injection brine discharge process.
Example two
The second embodiment of the invention provides a multi-stage gas injection and brine discharge method for a salt cavern gas storage, the flow of which is shown in fig. 2, comprising the following steps performed by any drill row integrated tubular column in the first embodiment:
step S21: and (3) drilling and discharging the integrated tubular column from the production tubular column, and drilling residues at the bottom of the salt cavern gas storage.
After the salt cavern halogen dissolving cavity making is finished, the depth of the residue surface is detected by adopting a conventional oil pipe column, and the optimal installation position of a halogen discharging short section of a second halogen discharging device of the drilling and discharging integrated pipe column and whether a halogen adding and rearranging pipe column is required to be installed at the upper end of a first halogen discharging device are determined according to the depth of the residue surface and other factors.
The first bypass hole on the pipe wall of the first brine discharge device of the drilling and discharging integrated pipe column is blocked by the soluble patch in a normal state, and the second bypass hole arranged on the pipe wall of the brine discharge pup joint of the second brine discharge device is also in a closed state in a normal state, so that the drilling and discharging integrated pipe column is equal to the oil pipe column when drilling along residues.
The assembled drilling and discharging integrated pipe column is lowered into the salt cavity, and after a drill bit of the drilling and discharging integrated pipe column reaches the residue surface, the drilling and discharging integrated pipe column is lifted until the drill bit is at a second set distance from the residue surface; drilling residues into the residues by adopting a drilling mode of small weight on bit hanging and drilling to form holes; and stopping drilling after continuing drilling to the set condition.
The second set distance may be about 0.5 m.
Specifically, the integrated pipe column is lowered into the salt cavity, and the lowering speed is controlled when the depth of the integrated pipe column is close to the depth of the residue surface; the integrated pipe column is slowly lowered, and is shortened by about 0.5m after being detected to the residue surface; the pump is slowly started on the ground, a drilling mode of 'small weight on bit' is adopted, and a screw drilling tool on the integrated tubular column is utilized to drive a drag bit to slowly drill holes on the residue surface; after the integrated pipe column drills holes in the cavity bottom residues, pushing the drag bit to slowly drill along the residues until the drilling is performed to a preset depth or the drag bit cannot continue to drill in the residues.
After the drilling operation of the residues at the bottom of the cavity is finished, the brine in the salt cavity is discharged to the ground step by utilizing the brine discharging pup joint of the multi-section repeatable switching of the second brine discharging device and the first brine discharging device. The method specifically comprises the following steps:
step S22: and determining a brine discharge nipple of the drilling and discharging integrated tubular column, which is positioned in a region from a first set depth below the brine surface to above the residue surface, as an effective brine discharge nipple.
The first set depth may be 2 to 3 meters. If the halogen-discharging pup joint which is too close to the halogen water surface is used as a halogen-discharging channel, potential safety hazards such as gas channeling exist.
Step S23: and opening a switch of the effective halogen discharge nipple, and performing gas injection and halogen discharge operation until the distance between the uppermost effective halogen discharge nipple and a halogen water surface reaches a first set distance.
And sequentially throwing soluble balls with diameters matched with the inner diameters of the ball seats of the current effective halogen discharge pup joint according to the sequence from bottom to top, and opening a switch of the current effective halogen discharge pup joint.
Specifically, firstly, putting a soluble ball with the diameter matched with the inner diameter of the ball seat of the lowest effective halogen discharge nipple, and opening a switch of the lowest effective halogen discharge nipple; and putting in a soluble ball … … with the diameter matched with the inner diameter of the ball seat of the last effective halogen discharge nipple until all the switches of the effective halogen discharge nipple are opened.
And injecting gas into the salt cavern gas storage through an annulus between the production pipe column and the drilling and discharging integrated pipe column, and discharging halogen through the drilling and discharging integrated pipe column.
Step S24: and (3) suspending gas injection and brine discharge operation, and closing a switch of the effective brine discharge nipple with the distance reaching a first set distance with the brine surface.
And (3) throwing a soluble ball with the diameter matched with the inner diameter of the ball seat of the effective brine discharge nipple, and closing a switch of the effective brine discharge nipple, wherein the distance between the switch and the brine surface reaches a first set distance.
Step S25: and recovering the gas injection and halogen discharge operation until the distance between the effective halogen discharge pup joint and the halogen water surface reaches a first set distance.
And returning to the step S24 until the switches of all the effective halogen discharging pup joints are closed.
Step S26: and determining the switch closing of all the effective halogen discharging pup joints.
At this time, the brine discharge work of brine above the residue surface is finished.
Step S27: continuing gas injection and brine discharge operation, and discharging residual brine above the residue surface, particles in the residue and brine to the ground through a first brine discharge device.
In the gas injection and brine discharge operation process, the method further comprises the step of adjusting the ground gas injection parameters according to the wellhead liquid return condition of the drilling and brine discharge integrated tubular column. The gas injection parameters mainly comprise gas injection quantity and injection speed.
Specifically, take integrated tubular column installation tertiary repeatedly switchable arrange steamed nipple joint as an example, through tertiary repeatedly switchable arrange steamed nipple joint and first row of steamed device when the operation of gas injection row's steamed, can discharge salt intracavity brine and granule residue to ground. The implementation steps are as follows: step one, determining the well depth of each part on the integrated tubular column according to the data such as the actual drilling depth of the residue drilling operation along the bottom of the cavity and the like; sequentially opening three-stage repeatable switching halogen discharge pup joints in a ball throwing and pressing mode, using a second bypass hole of the three-stage repeatable switching halogen discharge pup joint as a liquid discharge channel, injecting high-pressure natural gas into a salt cavity through an annulus between a production pipe column (an injection and production pipe column) and an integrated pipe column in the salt cavity, pushing brine to enter an inner cavity of the integrated pipe column through the liquid discharge channel, and discharging the brine to the ground (shown in the attached figure 3); in the gas injection and brine discharge process, when the depth of the brine working liquid level is close to that of the first-stage repeatable switching brine discharge nipple, stopping gas injection and brine discharge operation, and closing the first-stage repeatable switching brine discharge nipple in a ball injection and pressing mode; step four, after the sphere to be put into is self-dissolved, slowly opening a well, recovering gas injection and halogen discharge operation, and discharging halogen by using a liquid inlet channel of a second-stage and third-stage repeatable switching halogen discharge nipple installed on the integrated tubular column (shown in figure 4); step five, when the depth of the brine working fluid level is close to the second-stage repeatable switching brine discharge nipple, repeating the step three, closing the second-stage repeatable switching brine discharge nipple, and discharging brine by utilizing a liquid inlet channel of the third-stage repeatable switching brine discharge nipple (shown in figure 5); and step six, when the depth of the brine working liquid level is close to the third-stage repeatable switching brine discharge nipple, the gas injection brine discharge operation is suspended, and the third-stage repeatable switching brine discharge nipple is closed in a ball injection and pressing mode.
After the ball body in the third-stage repeatable switching halogen discharge pup joint is completely self-dissolved, a tubular column is not needed, a well is slowly opened, gas injection is continuously carried out, a first halogen discharge device at the lower part of the integrated tubular column can be used for starting gas injection and halogen discharge operation at the next stage, and residual brine above the residue surface, part of brine in the residue and residue particles can be discharged to the ground.
In the brine discharge process above the residue surface, the soluble patches on the wall of the first brine discharge device are completely self-dissolved, and the first bypass holes are communicated to provide a liquid inlet channel for discharging brine and residue particles in the residue. Part of brine and part of small-particle-size residue particles in the residue are driven to enter the integrated tubular column through the liquid inlet channel by continuous gas injection, and are discharged to the ground (shown in figure 6).
And after the brine gas-flooding discharge operation in the salt cavity and the residues is finished, the integrated tubular column completion is lifted out under pressure. When the integrated pipe column is buried by cavity bottom residues and the lifting resistance is overlarge, the control rod is put into the integrated pipe column to press, the sliding sleeve is pushed to move downwards to open the locking piece of the multifunctional releasing, and the pipe column is released, so that the pipe column above the multifunctional releasing can be lifted up with pressure.
Fig. 7 is a schematic diagram of a conventional gas injection and brine discharge process, wherein most of brine above the residue surface can be discharged through a brine discharge pipe column, but brine still remains above the residue surface to a certain depth in the gas injection and brine discharge process because the brine discharge pipe column bends or is considered for safety reasons (gas channeling prevention and the like).
According to the salt cavern gas storage gas injection and brine discharge method provided by the embodiment of the invention, brine above the residue surface can be discharged, and part of brine and small particles in the residue can be discharged, compared with the conventional gas injection and brine discharge process, the salt cavern gas storage can expand the effective gas storage space by more than 14%, so that the working gas quantity and economic benefit of a salt cavity are greatly improved; the method has the advantages that the effective space volume of the cavity can be increased by more than 25% when the old cavity of the salt mine high-residue brine mining well is reformed and utilized, the time for dissolving brine to manufacture the cavity can be greatly shortened, and a large amount of warehouse building cost can be saved, so that the reformation and utilization of the old cavity of the salt mine high-residue brine mining well can be promoted, the development and construction of a salt cavern gas storage can be promoted, and the economic and social benefits are great.
It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this invention.
The foregoing description includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims.
Claims (14)
1. The drilling and discharging integrated pipe column is characterized by comprising a drill bit, a drilling tool, a first halogen discharging device, a second halogen discharging device and a halogen discharging pipe column which are sequentially arranged from bottom to top;
a first bypass hole is formed in the pipe wall of the first brine discharge device, the first bypass hole is plugged by a patch, and the dissolution time of the patch in brine is greater than a set time threshold;
the second brine discharge device comprises at least one section brine discharge nipple, the brine discharge nipple is provided with a switch, a second bypass hole arranged on the pipe wall of the brine discharge nipple is communicated with the outside in the state that the switch is opened, and the second bypass hole is not communicated with the outside in the state that the switch is closed.
2. The drilling and discharging integrated pipe column according to claim 1, wherein the brine discharging short section comprises an inner cylinder and an outer cylinder, and a ball-throwing switch is connected to the upper part of the inner cylinder;
in the state that the switch is opened, a second bypass hole on the wall of the inner cylinder and a second bypass hole on the wall of the outer cylinder are overlapped;
and in the state that the switch is closed, no overlapping part exists between the second bypass hole on the wall of the inner cylinder and the second bypass hole on the wall of the outer cylinder.
3. The drill string integrated pipe string of claim 2, wherein the ball-throwing switch comprises a spring, a reset mechanism and a ball seat which are sequentially arranged from bottom to top.
4. The drill string integrated pipe string of claim 3, wherein if the second brine discharging device comprises a plurality of brine discharging pup joints, the inner diameter of the ball seat of each brine discharging pup joint is from the large to the small, and the difference value of the inner diameters of the ball seats of two adjacent brine discharging pup joints is larger than a set inner diameter difference threshold value.
5. The drill string integrated pipe string of claim 1, further comprising a release disposed at an upper end of the second brine discharging device;
and the releasing device is used for releasing the drill string integrated pipe column which comprises the releasing device and the parts above the releasing device when the releasing device fails to release the drill string integrated pipe column.
6. The drill string integrated pipe string of claim 1, further comprising a weighted brine-draining pipe string disposed at an upper end of the first brine-draining device;
the weight of the weight halogen discharge pipe column is larger than that of the weight halogen discharge pipe column.
7. The drill string integrated pipe string of claim 1, wherein the drill bit is a four-winged stepped drag bit;
the drilling tool is a screw drilling tool.
8. The drill string integrated pipe string as recited in any one of claims 1-7, wherein at least one layer of sand control screen is disposed on the outer wall of the first brine discharge device and the outer wall of the brine discharge nipple of the second brine discharge device.
9. The drill string integrated pipe string as recited in any one of claims 1-7, wherein a brine-draining pipe string section is connected between the first brine-draining device and the second brine-draining device;
if the second halogen discharging device comprises a plurality of sections of halogen discharging short sections, a halogen discharging tubular column section is connected between two adjacent sections of halogen discharging short sections.
10. A multi-stage gas injection and brine discharge method for a salt cavern gas storage, which is characterized by comprising the following steps of:
the drilling and discharging integrated pipe column is put into the production pipe column to drill residues at the bottom of the salt cavern gas storage;
determining a brine discharge nipple of the drilling and discharging integrated pipe column, which is positioned below a brine surface and in a region from a first set depth to a position above a residue surface, as an effective brine discharge nipple, turning on a switch of the effective brine discharge nipple, performing gas injection brine discharge operation until the distance between the uppermost effective brine discharge nipple and the brine surface reaches the first set distance, suspending gas injection brine discharge operation, and turning off the switch of the effective brine discharge nipple;
if the effective halogen discharge pup joint is more than one section, the gas injection halogen discharge operation is resumed until the distance between the other effective halogen discharge pup joint and the brine surface reaches the first set distance, and the suspended gas injection halogen discharge operation is returned to be executed until the switches of all the effective halogen discharge pup joints are closed;
continuing gas injection and brine discharge operation, and discharging brine above the residue surface, particles in the residue and brine to the ground through the first brine discharge device.
11. The method of claim 10, wherein the opening the switch of the active halogen elimination sub specifically comprises:
and sequentially throwing soluble balls with diameters matched with the inner diameters of the ball seats of the current effective halogen discharge pup joint according to the sequence from bottom to top, and opening a switch of the current effective halogen discharge pup joint.
12. The method as claimed in claim 10, wherein the drilling of the residue at the bottom of the salt cavern gas storage comprises:
after the drill bit of the drill row integrated pipe column reaches the residue surface, lifting the drill row integrated pipe column until the drill bit is at a second set distance from the residue surface;
drilling residues into the residues by adopting a drilling mode of small weight on bit hanging and drilling to form holes;
and stopping drilling after continuing drilling to the set condition.
13. The method of any one of claims 10 to 12, wherein the gas injection and halogen removal operation further comprises:
and adjusting the ground gas injection parameters according to the wellhead liquid return condition of the drilling and discharging integrated tubular column.
14. The method according to any one of claims 10 to 12, wherein the gas injection and halogen removal operation specifically comprises:
and injecting gas into the salt cavern gas storage through an annulus between the production pipe column and the drilling and discharging integrated pipe column, and discharging halogen through the drilling and discharging integrated pipe column.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550816.6A CN117127920A (en) | 2022-05-18 | 2022-05-18 | Multi-stage gas injection and brine discharge method for drilling and discharging integrated tubular column and salt cavern gas storage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550816.6A CN117127920A (en) | 2022-05-18 | 2022-05-18 | Multi-stage gas injection and brine discharge method for drilling and discharging integrated tubular column and salt cavern gas storage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117449798A (en) * | 2023-12-22 | 2024-01-26 | 中国石油集团渤海钻探工程有限公司 | Injection and production gas well back-insertion sealing device and application method thereof |
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2022
- 2022-05-18 CN CN202210550816.6A patent/CN117127920A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117449798A (en) * | 2023-12-22 | 2024-01-26 | 中国石油集团渤海钻探工程有限公司 | Injection and production gas well back-insertion sealing device and application method thereof |
| CN117449798B (en) * | 2023-12-22 | 2024-02-23 | 中国石油集团渤海钻探工程有限公司 | Injection and production gas well back-insertion sealing device and application method thereof |
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