CN114439452A - Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method - Google Patents

Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method Download PDF

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Publication number
CN114439452A
CN114439452A CN202210107291.9A CN202210107291A CN114439452A CN 114439452 A CN114439452 A CN 114439452A CN 202210107291 A CN202210107291 A CN 202210107291A CN 114439452 A CN114439452 A CN 114439452A
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pipe column
brine
pipe string
pipe
string device
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CN114439452B (en
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何奇
邓金根
冯永存
郑瑞强
张帅
孙孟莹
李舒倩
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China University of Petroleum Beijing
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China University of Petroleum Beijing
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/28Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00Drives for drilling, used in the borehole
    • E21B4/02Fluid rotary type drives
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/08Screens or liners
    • E21B43/086Screens with preformed openings, e.g. slotted liners

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (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)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to a pipe string device and a brine discharge method for discharging brine from a sediment gap of a salt cavern gas storage, which comprise the following steps: the device comprises a brine discharge pipe column, a sand prevention pipe column, a screw drilling tool and a drill bit; the sand prevention pipe column is coaxially sleeved on the outer side of the screw drilling tool, and the top ends of the sand prevention pipe column and the screw drilling tool are respectively connected with the outer side and the inner side of the bottom end of the brine discharge pipe column; the sand control pipe column comprises screen joints and anti-falling joints which are formed on the side wall of the sand control pipe column, and the anti-falling joints are connected to the lower end of the inner wall of the sand control pipe column; the top end of the screw drilling tool is connected with the bottom end of the halogen discharge pipe column, and the bottom end of the screw drilling tool is connected with the drill bit. The pipe string device is placed at the bottom of the sediment space of the cavity, so that most of brine in sediment gaps can be discharged under the condition that insoluble substances with large particle sizes enter the pipe string device, and the whole or part of the pipe string device is lifted out in combination with the problem of pipe burying after the brine discharge is finished.

Description

Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method
Technical Field
The invention relates to the technical field of gas injection and brine discharge of a salt cavern underground gas storage, in particular to a pipe string device and a brine discharge method for discharging brine in a sediment gap of a salt cavern gas storage.
Background
Salt cavern gas storage generally refers to and makes the cavity that the cavity can be stored gas with underground salt deposit through water-soluble mode of building the chamber, pours into gas into to the cavity in the annular space between intermediate pipe and the central tube to discharge brine from the central tube, make gas storage in order to satisfy user's demand and national strategic reserve needs in the cavity. Due to the particularity of the salt layer geology in China, a large amount of insoluble substances can be generated after the salt cavern is dissolved, and the space depth of the sediment formed after sedimentation can reach dozens of meters or even hundreds of meters. And because the brine at the bottom of the cavity occupies the sediment gap and can not be discharged, at least more than 20% of the cavity space can not be effectively stored and utilized, and the waste of resources and economy is caused.
The conventional gas injection and brine discharge technology is to carry out construction operation by lowering a brine discharge pipe column, namely a central pipe, above the surface of a sediment space, generally keeps a pipe orifice at a distance of 2-3 meters from the surface of the sediment space in order to avoid the risk that part of sediment particles enter the brine discharge pipe orifice along with flowing brine in the gas injection and brine discharge process, so that the cavity from the pipe orifice to the surface of the sediment space is wasted, and the space in the whole sediment gap cannot be effectively utilized.
In the prior art, an attempt is made to use a hydraulic jet method to break away the sediment and form a brine discharge channel, and a brine discharge pipe column is lowered to the bottom of the sediment space so as to discharge more brine. Although the technology can effectively flush partial particles on the surface of the sediment space, the cavity is in a high-pressure state in the gas injection and brine discharge stage in actual conditions, and the jet pressure generated by hydraulic injection is difficult to achieve ideal effects in brine.
In addition, when the sediment discharge pipe column is lowered to the bottom of the sediment space, sediment particles can enter the pipe opening to block the sediment discharge pipe column, and insoluble substances can flow to the vicinity of the pipe wall in the sediment discharge process at the bottom of the sediment space, so that the risk that the sediment pipe column cannot be discharged after being buried is caused.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide a brine discharge pipe string for a sediment gap of a salt cavern gas storage, which can be lowered into the bottom of a sediment space of a cavity by using relatively few large tools on site, discharge most of brine in the sediment gap under the condition of preventing insoluble particles with large particle size from entering the pipe string device, and remove the whole or part of the pipe string device in combination with the problem of buried pipe after the brine discharge is finished. The invention also provides a method for discharging brine from the sediment gap of the salt cavern gas storage.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a pipe string device for discharging brine from a sediment gap of a salt cavern gas storage, comprising: the device comprises a brine discharge pipe column, a sand prevention pipe column, a screw drilling tool and a drill bit;
the sand prevention pipe column is coaxially sleeved on the outer side of the screw drilling tool, and the top ends of the sand prevention pipe column and the screw drilling tool are respectively connected with the outer side and the inner side of the bottom end of the brine discharge pipe column;
the sand control pipe column comprises screen joints and anti-falling joints which are formed on the side wall of the sand control pipe column, and the anti-falling joints are connected to the lower end of the inner wall of the sand control pipe column;
the top end of the screw drilling tool is connected with the bottom end of the halogen discharge pipe column, and the bottom end of the screw drilling tool is connected with the drill bit.
Preferably, the brine discharging pipe column comprises a first brine discharging pipe column, a first releasing hand, a second brine discharging pipe column and a second releasing hand, the upper end of the first brine discharging pipe column is close to a wellhead, and the first brine discharging pipe column, the first releasing hand, the second brine discharging pipe column and the second releasing hand are sequentially coaxially connected in series;
the first releasing device comprises a first upper releasing part, a first lower releasing part and a first shearing pin, wherein the lower end of the first upper releasing part and the upper end of the first lower releasing part are provided with eyelets, and the first upper releasing part and the first lower releasing part are inserted into the eyelets through the first shearing pin and are connected;
the second releasing part comprises a second upper releasing part and a second lower releasing part, and the bottom end of the second upper releasing part is coaxially sleeved and connected with the top end of the second lower releasing part through a second shearing pin;
the upper end of the sand control pipe column is coaxially connected with the outer side of the lower end of the second upper releasing component in series;
the screw drilling tool is arranged on the inner side of the sand prevention pipe column, the upper end of the screw drilling tool is coaxially connected with the lower end of the second lower releasing component, and the lower end of the screw drilling tool is connected with the drill bit;
when the second shearing pin is broken, the second lower releasing part, the screw drilling tool and the drill bit are clamped on the anti-dropping joint when moving downwards to the bottom of the sand control pipe column, and the screen slot is communicated with the pipe orifice of the brine discharge pipe column to form a circulation channel.
Preferably, a conversion joint is formed at the bottom end of the second upper releasing component, a ball seat is formed at the top end of the second lower releasing component, the upper end of the ball seat is connected with the lower end of the conversion joint, and the second upper releasing component, the conversion joint, the ball seat and the second lower releasing component are sequentially connected in series to form a hydraulic channel.
Preferably, the screw drilling tool further comprises a bypass valve, a hydraulic motor, a universal shaft and a transmission shaft, wherein the bypass valve, the hydraulic motor, the universal shaft and the transmission shaft are sequentially in transmission connection, and the transmission shaft is in transmission connection with the drill bit.
On the other hand, the invention also provides a method for discharging brine in the sediment gap of the salt cavern gas storage, which comprises the following steps:
after conventional gas injection and brine discharge are carried out in the space above the surface of the sediment in the cavity, a conventional brine discharge pipe column is taken out, and the pipe string device is put into the cavity;
injecting clear water or light salt water into the pipe string device from a wellhead, wherein the liquid forms hydraulic pressure through the brine discharge pipe column and the screw drill tool and transmits power to the drill bit;
the drill bit rotates to drive the pipe string device to move downwards, the drill bit breaks the sediment and forms a brine discharge channel, and the pipe string device is continuously lowered to the bottom of the sediment space;
lifting the pipe string device for a preset distance to form a reserved pocket;
the pipe string device is subjected to pressure building, so that a communication channel between the screw drilling tool and the brine discharge pipe column is disconnected, the screw drilling tool and the drill bit move downwards to be clamped at the anti-drop joint, and the screen slot is communicated with the pipe orifice of the brine discharge pipe column to form a circulation channel;
injecting gas to enable brine in the sediment gap to enter the brine discharge pipe column from the screen slots;
and lifting the pipe string device after the brine discharge is finished.
Preferably, the pipe string device is subjected to pressure building, so that the second shearing pin is broken, the second lower releasing component, the screw drill and the drill bit move downwards to be clamped at the anti-drop joint, and the screen slot is communicated with the pipe orifice of the halogen discharge pipe column to form a circulation channel.
Preferably, the pipe string device is subjected to pressure building, specifically, clear water or light salt water is continuously injected into a ball seat located in the brine discharge pipe string through ball throwing to continuously apply hydraulic pressure, the pressure building state is achieved, the second shear pin is disconnected, the ball seat, a second lower releasing component located at the bottom end of the brine discharge pipe string, the screw drill and the drill bit slide downwards together, and the ball seat, the second lower releasing component, the screw drill and the drill bit are clamped at the anti-dropping joint.
Preferably, when the distance between the gas-liquid interface and the highest position of the screen slot is 2-3 m, stopping gas injection and halogen discharge, and lifting the pipe string device after stopping halogen discharge.
Preferably, the step of lifting up the pipe string device after the completion of the brine discharge further comprises:
if the pipe burying phenomenon does not occur, the whole pipe string device is completely lifted out;
if the pipe burying phenomenon occurs, the pipe string device is continuously lifted, the first shearing pin is disconnected, the first lower releasing component, the second brine discharging pipe column, the sand prevention pipe column, the screw drilling tool and the drill bit are left in the cavity, and the first brine discharging pipe column and the first upper releasing component are lifted out.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the device and the process method for discharging the brine pipe string in the sediment gap can rotate the drill bit in a manner of applying hydraulic pressure to the screw drill in the pipe string device under the condition of not using a drilling machine on site, so that the whole pipe string device is carried to drill into the sediment space bottom of the salt cavern gas storage.
2. Before the gas injection and brine discharge stage at the bottom of the sediment space begins, the sand control pipe column is arranged outside the screw drilling tool and fixed at the lower end of the brine discharge pipe column and does not move, the screw drilling tool and the drill bit can slide downwards by throwing balls into the pipe string device to suppress pressure, and a fluid channel is formed between a sand control pipe screen gap and the brine discharge pipe column, so that insoluble substances with large particle size can be effectively prevented from entering the brine discharge pipe column to be blocked, and further a large amount of brine in sediment gaps is discharged.
3. After the gas injection and the brine discharge are finished, the problem of slag settling and pipe burying is fully considered, and the brine discharge pipe column can be selected to be wholly or partially taken out.
4. The invention adopts a pipe string device which is relatively accordant with the actual field and a process method which is relatively simple and feasible to operate, the brine discharge pipe column is put into the bottom of the sediment space of the salt cavern gas storage, a large amount of brine in the gap is discharged on the basis of avoiding the sediment from blocking the pipe column, and after the gas injection and brine discharge stage is finished, the pipe string device components are taken out as much as possible by combining whether the pipe burying occurs on the field. The invention not only fully considers the problems of site construction cost, operation difficulty and safety risk, but also greatly improves the space utilization rate of the salt cavern gas storage, and effectively avoids the waste of resources and economy.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings.
In the drawings:
FIG. 1 is a schematic diagram of conventional gas injection and halogen removal for a conventional salt cavern gas storage;
FIG. 2 is a schematic semi-sectional view of a pipe string device for discharging brine from a sediment gap of a salt cavern gas storage provided by the invention;
FIG. 3 is a schematic diagram of the configuration of a halogen removal column;
FIG. 4 is a schematic structural diagram of a second release, sand control string, auger and drill bit after the auger has descended;
FIG. 5 is a cross-sectional schematic view of a second release, a progressive cavity drill tool and a drill bit;
FIG. 6 is a schematic view of the tube string device lowered into the bottom of the sediment space;
FIG. 7 is a schematic diagram of gas injection and brine discharge of the second lower releasing component, the screw drill and the drill bit descending to the bottom of the reserved pocket and the pipe string device in the sediment gap of the salt cavern gas storage;
the reference symbols in the drawings denote the following:
1-discharging halogen pipe column, 2-sand control pipe column, 3-screw drilling tool, 4-drill bit, 101-sediment space, 102-central pipe, 103-middle pipe, 11-first discharging halogen pipe column, 12-first releasing part, 121-first upper releasing part, 122-first lower releasing part, 123-first shearing pin, 13-second discharging halogen pipe column, 14-second releasing part, 141-second upper releasing part, 142-second lower releasing part, 143-conversion joint, 144-ball seat, 145-second shearing pin, 21-screen joint, 22-anti-dropping joint and 31-bypass valve; 32-hydraulic motor, 33-universal shaft and 34-transmission shaft.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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 invention to those skilled in the art.
FIG. 1 is a schematic diagram of conventional gas injection and halogen removal of a conventional salt cavern gas storage. Because most of salt ores in China are layered salt rocks and the grade is poor, a large amount of insoluble substances can be generated after the salt is subjected to ore dissolution and cavity construction, and insoluble substance particles are settled in brine in a cavity to form a sediment space 101 at the bottom of the cavity. In order to prevent partial particles on the surface of the sediment space 101 from entering the brine discharge pipe column along with brine in the gas injection and brine discharge processes and causing the risk of blocking the pipe column, a conventional brine discharge pipe column, namely a central pipe 102, is generally lowered to a position 2-3 meters above the surface of the sediment space 101 from the pipe orifice. In the conventional gas injection and brine discharge stage, gas is injected from the annular space between the middle pipe 103 and the central pipe 102, and brine is discharged from the opening of the central pipe 102 back to the ground.
Referring to fig. 1, before the tube string device and the process for discharging brine in a sediment gap provided by the present invention are used, the central tube 102 needs to be lifted out after the conventional gas injection and brine discharge is finished, and then the tube string device provided by the present invention needs to be lowered again.
Fig. 2 is a schematic structural diagram of a sediment gap brine discharge pipe string device of a salt cavern gas storage provided by the invention, and the pipe string device comprises a brine discharge pipe column 1, a sand prevention pipe column 2, a screw drilling tool 3 and a drill bit 4. The sand control pipe column 2 is coaxially sleeved on the outer side of the screw drilling tool 3, and the top ends of the sand control pipe column 2 and the screw drilling tool 3 are connected with the bottom end of the brine discharge pipe column 1. The sand control string 2 comprises screen cuts 31 and anti-drop joints 22 formed on the side wall of the sand control string 1, and the anti-drop joints 22 are connected to the lower end of the inner wall of the sand control string 2. The top end of the screw drilling tool 3 is connected with the bottom end of the brine discharge pipe column 1, and the bottom end of the screw drilling tool is connected with the drill bit 4.
As shown in fig. 3, the brine discharge pipe column 1 comprises a first brine discharge pipe column 11, a first releasing hand 12, a second brine discharge pipe column 13 and a second releasing hand 14, wherein the upper end of the first brine discharge pipe column 11 is close to a wellhead, and the first brine discharge pipe column 11, the first releasing hand 12, the second brine discharge pipe column 13 and the second releasing hand 14 are sequentially coaxially connected in series. The first releasing element 12 includes a first upper releasing element 121, a first lower releasing element 122 and a first shear pin 123, and the first shear pin 123 is inserted into the holes of the first upper releasing element 121 and the first lower releasing element 122 to connect them.
Referring to fig. 4 and 5, second releasing element 14 includes a second upper releasing element 141 and a second lower releasing element 142, and second releasing element 14 further includes a second shear pin 145, and second shear pin 145 is inserted into the hole of second upper releasing element 141 and second lower releasing element 142 to connect them.
The upper end of the sand control string 2 is connected to the outside of the lower end of the second upper releasing member 141.
The bottom end of the second upper releasing member 141 is formed with a conversion joint 143, the top end of the second lower releasing member 142 is formed with a ball seat 144, the upper end of the ball seat 144 is connected with the lower end of the conversion joint 143, and the lower end of the inner side of the second upper releasing member 141 is provided with the conversion joint 143, the ball seat 144, the second lower releasing member 142, the screw drill 3 and the drill bit 4 which are connected in series in sequence. The purpose of the adapter 143 is to convert the second upper releasing part 141 with a larger outer diameter to the ball seat 144 with a smaller inner diameter, the screw drill 3 and other parts, so that the brine discharge pipe column 1 connected above is communicated with the screw drill 3 only through the adapter 143, the ball seat 144 and the second lower releasing part 142 before the second shear pin 145 is broken due to the ball throwing and pressure holding, and the screen cut 21 of the sand control pipe column is blocked by the screw drill 3 at the inner side and is not communicated with the brine discharge pipe column 1.
The screw drill 3 is arranged on the inner side of the sand control pipe column 2, and the upper end of the screw drill 3 is coaxially connected with the lower end of the second lower releasing component 142. The lower end of the screw drill 3 is connected to a drill 4. The screw drill 3 comprises a bypass valve 31, a hydraulic motor 32, a cardan shaft 33 and a transmission shaft 34, which are connected in series in that order.
The pipe string device provided by the invention is put into the cavity to a position above the surface of the sediment space 101, clear water or fresh brine is injected into the pipe string device from a well head, liquid enters the screw drill 3 through the brine discharge pipe column 1, flows through the bypass valve 31 and then enters the hydraulic motor 32 to form hydraulic pressure, and the generated power is transmitted to the drill bit 4 through the universal shaft 33 and the transmission shaft 34.
The screw drill 3 and the drill 4 have a first state and a second state. When in the first state, the second shear pin 145 is not broken, the top ends of the screw drill 3 and the drill bit 4 are connected with the first upper releasing member 141 through the second lower releasing member 142 and the second shear pin 145, and at this time, the screen slits 21 are not communicated with the halogen discharging pipe column 1 to form a flow passage. When the brine discharge pipe column is in the second state, the second shearing pin 145 is broken, the second lower releasing component 142, the screw drill 2 and the drill bit 4 are clamped on the anti-dropping joint 22 when moving downwards to the bottom of the sand control pipe column 2, the screen cuts 21 are communicated with the pipe orifice of the brine discharge pipe column 1 to form a circulation channel, and brine is discharged through the circulation channel.
As shown in fig. 6, after the drill bit 4 rotates, the drill bit can break the sediment and form a brine discharge channel, and the pipe string device is continuously lowered to the bottom of the sediment space 102. In order to meet the requirements of subsequent construction operation, the pipe string device needs to be lifted for 2-3 meters to reserve the pocket 104, and the reserved pocket 104 ensures that the screw drilling tool 3 and the drill bit 4 smoothly move downwards to the bottom of the pocket 104.
As shown in fig. 7, after the pocket is reserved, the position of the pipe string device is kept unchanged, the ball is thrown into the pipe string device and clamped at the ball seat 144, and clean water or light salt water is continuously injected to continuously apply hydraulic pressure, so that the pressure-holding state is achieved. When the pressure build-up reaches the fracture pressure of the second pin shear pin 145, the second shear pin 145 is broken, the ball seat 144 is separated from the adapter 143, and the ball seat 144 connects the second lower releasing part 142, the screw drill 3 and the drill bit 4 to slide along the inner wall of the sand control string 2 from top to bottom.
The sand control pipe column 2 comprises a screen joint 21 and an anti-drop joint 22 which are formed on the side wall of the sand control pipe column 1, and the anti-drop joint 22 is connected with the lower end of the inner wall of the sand control pipe column 2. The second lower release member 142 may become stuck in place in the anti-trip joint 22 as it descends to the bottom of the sand control string 2. Specifically, a step may be formed on the outer side wall of the second lower releasing member 142, and when the second shearing pin 145 is broken, the second lower releasing member 142 descends until the step is hung on the anti-drop joint 22 and is clamped, and the descending is stopped. At this time, the screw drill 3 is disconnected from the brine discharge pipe column 1 and is not connected, and the screen slots 21 and the pipe orifice of the brine discharge pipe column 1 form a flow passage. The gas injection and halogen removal in the sediment gap can be started.
Insoluble substances with large particle size in the sediment space 101 are blocked outside the screen slot 21, so that the risk that the insoluble substances enter the halogen discharge pipe column to be blocked is effectively avoided.
In order to prevent gas from entering a brine discharge pipe column along with brine to cause potential safety hazards, gas injection and brine discharge are stopped when the distance between an injected gas interface and a brine interface and the highest position of a screen joint 21 is 2-3 m, all brine above the injected gas interface is discharged, and the gas can be stored in a sediment gap occupied before the brine.
After gas injection and brine discharge of the sediment gap are finished, the pipe string discharging device needs to be lifted up.
Referring to FIG. 6, the gas injection and the halogen removal at the bottom of the slag settling space 101 cause insoluble particles to be accumulated near the tube wall at the bottom, resulting in the occurrence of a pipe burying phenomenon.
The pipe string device is lifted up, and if the pipe burying phenomenon does not occur, the pipe string device can be integrally lifted out.
When a pipe burying phenomenon occurs, if the pipe string device is forcibly lifted out, the risk of breakage and damage of the pipe string can be generated at a high rate. When the pipe burying phenomenon occurs, the first shearing pin 123 can be broken by continuously lifting the pipe string device, the first lower releasing component 122, the second brine discharging pipe string 13, the second releasing component 14, the sand control pipe string 2, the screw drilling tool 3 and the drill bit 4 are left in the cavity, and the first brine discharging pipe string 11 and the first upper releasing component 121 are lifted out.
It is noted that the fracture pressure of the second shear pin 145 is less than the fracture pressure of the first shear pin 123, and the fracture pressure of the first shear pin 123 is less than the yield limit of the other portions of the pipe string apparatus than the first shear pin 123 and the second shear pin 145.
That is to say, in the process of the ball-throwing pressure-building and continuous pipe string lifting device, the plastic deformation and even the fracture damage of other parts of the pipe string device can not be caused except the corresponding shearing pin is disconnected.
Furthermore, all parts of the string device can be modified for specific salt cavern gas storage characteristic parameters. For example, the total length of the first discharge string 11 is adjusted and set according to the value of the wellhead distance from the surface of the sediment space 101. The length of the second discharging column 13 can be designed according to the depth from the surface of the sediment space 101 to the bottom of the chamber, so as to ensure that the first thrower 12 connected to the upper end of the second discharging column 13 is above the surface of the sediment space 101 and is not filled with sediment particles.
Based on the pipe string device for discharging brine from the sediment pores of the salt cavern gas storage, the invention also provides a brine discharge method for discharging brine from the sediment pores of the salt cavern gas storage, which comprises the following steps:
s1, after the conventional gas injection and brine discharge above the surface of the cavity sediment space 101 in the salt cavern gas storage are finished, the conventional brine discharge pipe column, namely the central pipe 102, is taken out.
And S2, lowering the pipe string device in the cavity to be above the surface of the sediment space 101.
S3, clear water or light salt water is injected into the pipe string device from the wellhead, the liquid enters the screw drill 3 through the halogen discharging pipe column 1, flows through the bypass valve 31 and then enters the hydraulic motor 32 to form hydraulic pressure, and the generated power is transmitted to the drill bit 4 through the universal shaft 33 and the transmission shaft 34.
S4, after the drill bit 4 rotates, the pipe string device is placed downwards, the drill bit 4 breaks sediment and forms a row of brine channels, and the pipe string device continues to be placed downwards to the bottom of the sediment space 101.
S5, reserving a pocket 104 for 2-3 m of the pipe string lifting device, wherein the inner side screw drilling tool 3 is communicated and sealed with the brine discharge pipe column 1, and the sieve seam 21 of the sand control pipe column 2 and the brine discharge pipe column 1 do not form a circulation channel.
S6, throwing balls into the pipe string device to the ball seat 144, carrying out pressure building until the fracture pressure of the second shearing pin 145, disconnecting the second shearing pin 145, separating the second lower releasing component 142 from the second upper losing component 141, enabling the ball seat 144, the second lower releasing component 142, the screw drilling tool 3 and the drill bit 4 to slide downwards together, clamping the second lower releasing component 142 at the anti-dropping joint 22 of the sand control pipe column 2, and enabling the screen slits 21 to be communicated with the pipe orifice of the brine discharge pipe column 1 to form a circulation channel.
S7, injecting gas from the annular space between the pipe string device and the middle pipe 103 to discharge brine in the sediment gap, blocking large-particle-size insoluble particles outside the pipe wall of the sand control pipe column 2, and enabling the brine to enter the brine discharge pipe column through the screen gaps and return to the ground.
And S8, stopping injecting gas and discharging halogen when the gas-liquid interface is 2-3 m away from the highest position of the screen slot 21.
And S9, lifting the pipe string device, and if the pipe burying phenomenon does not occur, taking out the whole pipe string device.
S10, if the pipe burying phenomenon occurs, the pipe string device is continuously lifted to enable the first shear pin 123 to reach the fracture pressure, the first shear pin 123 is disconnected, the first upper releasing component 121 is separated from the first lower releasing component 122, the first lower releasing component 122 and the second brine discharging pipe string 13 are left in the cavity, and the first brine discharging pipe string 11 and the first upper releasing component 121 are lifted out.
The invention adopts a pipe string device which is relatively accordant with the actual field and a process method which is relatively simple and feasible to operate, the brine discharge pipe column is put into the bottom of the sediment space of the salt cavern gas storage, a large amount of brine in the gap is discharged on the basis of avoiding the sediment from blocking the pipe column, and after the gas injection and brine discharge stage is finished, the pipe string device components are taken out as much as possible by combining whether the pipe burying occurs on the field. The invention not only fully considers the problems of site construction cost, operation difficulty and safety risk, but also greatly improves the space utilization rate of the salt cavern gas storage, and effectively avoids the waste of resources and economy.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A pipe string device that is used for salt cavern gas storage sediment space to arrange bittern, its characterized in that includes: the device comprises a brine discharge pipe column, a sand prevention pipe column, a screw drilling tool and a drill bit;
the sand prevention pipe column is coaxially sleeved on the outer side of the screw drilling tool, and the top ends of the sand prevention pipe column and the screw drilling tool are respectively connected with the outer side and the inner side of the bottom end of the brine discharge pipe column;
the sand control pipe column comprises screen joints and anti-falling joints which are formed on the side wall of the sand control pipe column, and the anti-falling joints are connected to the lower end of the inner wall of the sand control pipe column;
the top end of the screw drilling tool is connected with the bottom end of the brine discharge pipe column, and the bottom end of the screw drilling tool is connected with the drill bit.
2. The pipe string device according to claim 1, wherein the halogen discharging pipe string comprises a first halogen discharging pipe string, a first releasing gadget, a second halogen discharging pipe string and a second releasing gadget, the upper end of the first halogen discharging pipe string is close to a wellhead, and the first halogen discharging pipe string, the first releasing gadget, the second halogen discharging pipe string and the second releasing gadget are sequentially coaxially connected in series;
the first releasing device comprises a first upper releasing part, a first lower releasing part and a first shearing pin, wherein the lower end of the first upper releasing part and the upper end of the first lower releasing part are provided with eyelets, and the first upper releasing part and the first lower releasing part are inserted into the eyelets through the first shearing pin and are connected;
the second releasing part comprises a second upper releasing part and a second lower releasing part, and the bottom end of the second upper releasing part is coaxially sleeved and connected with the top end of the second lower releasing part through a second shearing pin;
the upper end of the sand control pipe column is coaxially connected with the outer side of the lower end of the second upper releasing component in series;
the screw drilling tool is arranged on the inner side of the sand prevention pipe column, the upper end of the screw drilling tool is coaxially connected with the lower end of the second lower releasing component, and the lower end of the screw drilling tool is connected with the drill bit;
when the second shearing pin is broken, the second lower releasing part, the screw drilling tool and the drill bit are clamped on the anti-dropping joint when moving downwards to the bottom of the sand control pipe column, and the screen slot is communicated with the pipe orifice of the brine discharge pipe column to form a circulation channel.
3. The pipe string device according to claim 1, wherein a bottom end of the second upper releasing member is formed with a crossover sub, a top end of the second lower releasing member is formed with a ball seat, an upper end of the ball seat is connected to a lower end of the crossover sub, and the second upper releasing member, the crossover sub, the ball seat and the second lower releasing member are connected in series in order to form a hydraulic passage.
4. The pipe string device according to claim 1, wherein the progressive cavity drill further comprises a bypass valve, a hydraulic motor, a cardan shaft, and a transmission shaft, the bypass valve, the hydraulic motor, the cardan shaft, and the transmission shaft being in sequential drive connection, the transmission shaft being in drive connection with the drill bit.
5. A method for discharging brine in a sediment gap of a salt cavern gas storage is characterized by comprising the following steps:
after the conventional gas injection and halogen discharge are carried out in the space above the surface of the sediment in the cavity, the conventional halogen discharge pipe column is lifted out, and the pipe string device as claimed in any one of claims 1 to 4 is put into the cavity;
injecting clear water or light salt water into the pipe string device from a wellhead, wherein the liquid forms hydraulic pressure through the brine discharge pipe column and the screw drill tool and transmits power to the drill bit;
the drill bit rotates to drive the pipe string device to move downwards, the drill bit breaks the sediment and forms a brine discharge channel, and the pipe string device is continuously lowered to the bottom of the sediment space;
lifting the pipe string device for a preset distance to form a reserved pocket;
the pipe string device is subjected to pressure building, so that a communication channel between the screw drilling tool and the brine discharge pipe column is disconnected, the screw drilling tool and the drill bit move downwards to be clamped at the anti-drop joint, and the screen slot is communicated with the pipe orifice of the brine discharge pipe column to form a circulation channel;
injecting gas to enable brine in the sediment gap to enter the brine discharge pipe column from the screen slots;
and lifting the pipe string device after the brine discharge is finished.
6. The method of discharging bittern of claim 5,
and (3) suppressing pressure in the pipe string device to break the second shearing pin, enabling the second lower releasing component, the screw drilling tool and the drill bit to move downwards to be clamped at the anti-falling joint, and enabling the screen slot to be communicated with the pipe orifice of the brine discharge pipe column to form a circulation channel.
7. The brine discharge method according to claim 6, wherein the pipe string device is subjected to pressure holding, specifically, the ball is thrown to a ball seat located in the brine discharge pipe string, clear water or weak brine is continuously injected to continuously apply hydraulic pressure, so that the pressure holding state is achieved, the second shear pin is disconnected, the ball seat, a second lower releasing part located at the bottom end of the brine discharge pipe string, the screw drill and the drill bit slide downwards together, and the pipe string device is clamped at the anti-dropping joint through the second lower releasing part.
8. The method for discharging bittern of claim 5, wherein when gas-liquid interface is 2-3 m away from the highest position of said screen slot, stopping gas injection and discharging bittern, and lifting up said pipe string device after stopping discharging bittern.
9. The method of discharging bittern of claim 6, wherein lifting up said tube string device after completion of the discharging bittern further comprises:
if the pipe burying phenomenon does not occur, the whole pipe string device is completely lifted out;
if the pipe burying phenomenon occurs, the pipe string device is lifted continuously, the first shearing pin is disconnected, the first lower releasing component, the second halogen discharging pipe column, the sand control pipe column, the screw drill and the drill bit are left in the cavity, and the first halogen discharging pipe column and the first upper releasing component are lifted out.
CN202210107291.9A 2022-01-28 2022-01-28 Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method Active CN114439452B (en)

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CN112796693A (en) * 2021-04-14 2021-05-14 山东博赛特石油技术有限公司 Pre-releasing filling tool and pre-releasing positive well-flushing sand-prevention well completion method
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CN112253118A (en) * 2020-10-21 2021-01-22 中国科学院武汉岩土力学研究所 Gas injection and brine discharge device and method for salt cavern gas storage
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