CN112343531B - Sand-blocking-prevention safety joint for downhole operation of oil exploitation and operation method - Google Patents
Sand-blocking-prevention safety joint for downhole operation of oil exploitation and operation method Download PDFInfo
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- CN112343531B CN112343531B CN202011216706.3A CN202011216706A CN112343531B CN 112343531 B CN112343531 B CN 112343531B CN 202011216706 A CN202011216706 A CN 202011216706A CN 112343531 B CN112343531 B CN 112343531B
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- sand
- pipe
- sand storage
- column
- safety joint
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
Abstract
The invention discloses a sand blocking prevention safety joint for underground operation of oil exploitation and an operation method, wherein the sand blocking prevention safety joint comprises a pipe column positioned in a well, one end, close to a well opening, of the pipe column is detachably connected with a sand prevention pipe, the other end of the pipe column is detachably connected with a plurality of coaxially-mounted sand storage pipe devices, and two adjacent sand storage pipe devices are fixedly connected through a pipeline joint; deposit the sand pipe device include with tubular column tip threaded connection deposit the sand section of thick bamboo, deposit the hydraulic pressure oil pipe of a coaxial line of fixed mounting in the sand section of thick bamboo, the fixed intercommunication sets up the branch pipe of a plurality of symmetric distributions on hydraulic pressure oil pipe's the lateral wall, the branch pipe internalization grafting connecting rod, the inner fixed connection piston of connecting rod still sets up the hydraulic fluid port with side hydraulic pressure oil pipe intercommunication on the branch pipe. The sand storage pipe device is arranged at one end of the pipe column, and when the pipe column is stuck by sand, the pipe column can be automatically stuck and unlocked, so that the whole pipe column can smoothly pass through the position of the sand clamp to continuously finish the work. The sand storage pipe device can be conveniently disassembled and assembled, and the working time is saved.
Description
Technical Field
The invention relates to the technical field of oil exploitation equipment, in particular to an oil exploitation underground operation sand jam prevention safety joint and an operation method.
Background
In the process of oil and gas exploitation, the safety joint is used for operations such as drilling, salvaging, well washing, well repairing, testing and the like, is arranged on a tubing string, and is a safety tool which is connected to the tubing string in the well and is easy to trip and buckle. The device is arranged at the position where the pipe column needs to be disconnected, can transmit torque and bear various composite stresses together with the pipe column, and can complete tripping and buckling of the operation pipe column through well mouth operation when a fault occurs in the well, thereby providing a guarantee tool for preventing and relieving underground accidents. The method mainly comprises two types of coarse-button square thread connection and shear pin type connection.
In the downhole operation or the production of oil-water wells, the phenomenon that the pipe column cannot move normally due to the fact that the pipe column is buried by sand caused by improper construction measures, formation sand production and other factors is called sand blocking. The sand card is a common drill clamping mode, and two types are common:
1. the sticking of the drill bit caused in the construction process of the underground operation.
2. The oil pipe or the downhole tool is blocked due to sand production in the production process of the oil-water well.
When sand buries between tubular column in the pit and the sleeve pipe, prevent that the sand pipe is blocked very easily and lead to unable taking out, when the height that sand buried is too high, the separation also can't be realized to the safety joint, will appear the problem of oil well overhaul like this, overhaul the oil well and need half a year time, maintenance cost is about a million yuan, can cause the big and a large amount of economic loss of operation work load.
At present, a common method for sand blocking is a sand washing method, wherein after a pen point is lowered to the position near a sand plug, high-pressure ejection high-speed flowing well washing liquid is used for washing and dispersing sand at the bottom of a well, and the circulated upward-returning liquid flow is used for carrying the dispersed sand to the ground. However, the length of the underground sand plug is hundreds of meters sometimes, the sand removal operation completely depends on sand washing, the time is sometimes required to be finished within several months, meanwhile, in the sand washing operation process, because sand can settle and is influenced by formation leakage, the on-way pressure loss is caused, the total liquid amount returned from a well head is lower than the total liquid amount entering the well, sometimes even one third of sand cannot reach, sand grains at the bottom of the well cannot be carried out of the well by the sand washing liquid, and a new sand plug position may also appear in the sand washing process. The sliding distance of sand in a horizontal section of a well bore is short (the diameter of a casing pipe), the sand is easy to deposit, but the sand mainly appears in a sand bed shape or a section of non-compact sand section shape, and a certain channel exists in the well bore at the upper part of the sand bed. If the sand section exists, sand is under the action of gravity, and once the sand section is influenced by external fluid or force, the sand section can be dispersed to two sides to form loosening or passages, so that firm self-locking force is difficult to generate.
In sand washing operations for horizontal wells, a situation of wash-out is often encountered. The sedimentation direction of the sand grains at the horizontal section always points to the bottom side of the inner wall of the casing and forms approximately 90 degrees with the flowing direction of the sand washing liquid. If the viscosity of the sand washing liquid is too small and the suspension capacity of the sand is insufficient, sand washed up at the bottom of the well is deposited after a short distance of transportation to form a sand dune (or a sand bed), and a sand blockage or a sand pipe string phenomenon occurs. In addition, the sand at the bottom of the well is accumulated for a long time and is combined with mineral ions at the bottom of the well to form a hard scale block, and the sand washing liquid cannot wash away the hard scale block. This cannot be improved by merely changing the sand wash viscosity and displacement.
The sand in the horizontal well is different from the sand in the straight section well in spatial form, and the formed blocking mechanism is different. In the horizontal section, because the well hole is in a horizontal state, the accumulation space is objectively enlarged, sand is dispersed and deposited along the axis of the shaft of the whole horizontal section and is in a loose state, and a sand bed or an untight sand section is formed in the shaft.
In the sand washing operation of a vertical well, the self-locking force of sand generated by the vertical well section and the horizontal section to the pipe column in the well is different, and the difference of the drilling clamping degree is large. In the sand washing, grinding/drilling/milling operation of a straight well section, when the flow velocity is slowed down or stops flowing, sand slips downwards under the influence of self gravity, starts to deposit and is influenced by the power of flowing liquid in a well, the deposition speed is improved, the compactness of a sand body is increased, the sand is accumulated around a pipe column, when the pipe column is lifted, a self-locking force is generated between the sand and the wall of a casing and the wall of the pipe column due to the action of friction force between the sand and the pipe wall, after the self-locking force is generated, the pipe column is greatly lifted to increase the friction force, the self-locking force is increased when the friction force is increased, the lifting load is larger, and the clamping is more serious.
Therefore, the sand-blocking prevention safety joint for the underground operation of oil exploitation and the operation method are provided for solving the problems.
Disclosure of Invention
The invention aims to provide a sand-blocking prevention safety joint for underground operation of oil exploitation and an operation method, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a sand blocking prevention safety joint for underground operation of oil exploitation comprises a pipe column positioned in an oil well, wherein one end, close to an opening of the oil well, of the pipe column is detachably connected with a sand prevention pipe, the other end of the pipe column is detachably connected with a plurality of coaxially-mounted sand storage pipe devices, and every two adjacent sand storage pipe devices are fixedly connected through a pipeline joint;
the sand storage pipe device comprises a sand storage barrel in threaded connection with the end part of the pipe column, a coaxial hydraulic oil pipe is fixedly installed in the sand storage barrel, a plurality of symmetrically distributed branch pipes are fixedly communicated and arranged on the side wall of the hydraulic oil pipe, a connecting rod is movably inserted in each branch pipe, the inner end of each connecting rod is fixedly connected with a piston, and an oil port communicated with the side hydraulic oil pipe is further formed in each branch pipe;
the outer end of the connecting rod is fixedly connected with a serrated knife, the serrated knives are centrally and symmetrically distributed on the outer side of the hydraulic oil pipe, through holes are formed in the side wall of the sand storage cylinder corresponding to the serrated knife, and the serrated knife can extend to the outer side of the sand storage cylinder through the through holes;
one side of depositing the sand section of thick bamboo and being close to the tubular column fixed mounting has the cylinder, the drive end fixed connection sand control cover of cylinder, the sand control cover activity is located the inboard of through-hole, and with deposit sand section of thick bamboo internal contact.
Preferably, the inner walls of the two ends of the sand storage cylinder are fixedly provided with connecting plates, the connecting plates are fixedly provided with the hydraulic oil pipes, and the two ends of each hydraulic oil pipe are detachably connected with the outer oil pipe through rotary sealing joints.
Preferably, the outer oil pipe and the side hydraulic oil pipe are alternately filled with hydraulic oil through a hydraulic pump.
Preferably, the piston is located between the inner end of the branch pipe and the oil port, and a sealing ring is arranged on the outer side of the piston and is in sealing contact with the inner wall of the branch pipe.
Preferably, two connecting rods are arranged on one toothed cutter, two branch pipes are arranged on the hydraulic oil pipe corresponding to one toothed cutter, and the toothed cutters are parallel to the axis of the hydraulic oil pipe.
Preferably, the sand control cover is a hollow cylindrical structure with openings at two ends, the outer diameter of the sand control cover is consistent with the inner diameter of the sand storage cylinder, and the bottom of the sand control cover is provided with a sawtooth structure.
The sand blocking prevention operation method for the underground operation of oil exploitation adopts the safety joint and comprises the following specific steps:
s1: the pipe column provided with the sand storage pipe device is placed underground for normal work;
s2: when the safety joint cannot be separated when the underground is blocked, the air cylinder contracts, the through hole on the sand storage cylinder is exposed by the sand prevention cover, and partial sand at the blocked position enters the sand storage cylinder, so that the blocking condition is relieved or the blocking is relieved;
s3: if the situation of blocking is not relieved, hydraulic oil is alternately injected into the outer oil pipe and the side hydraulic oil pipe through the hydraulic pump, the piston is driven to do reciprocating motion in the branch pipe, so that the tooth cutter passes through the through hole to repeatedly impact a sand pile at the blocking position, sand at the position of the sand blocking position is loosened and enters the sand storage cylinder, and blocking is relieved;
s4: after the clamping is released, the serrated knife is retracted into the sand storage cylinder, and the air cylinder extends out, so that the sand prevention cover covers the inner side of the through hole on the sand storage cylinder to block the through hole;
s5: and lifting the pipe column, taking down the sand storage pipe device and pouring out the sand in the sand storage pipe device, so as to be convenient for next use.
Compared with the prior art, the invention has the beneficial effects that:
1. the sand storage pipe device is arranged at one end of the pipe column, and can automatically release the clamp when meeting the sand clamp, so that the whole pipe column can smoothly pass through the position of the sand clamp to continuously finish the work.
2. The sand storage pipe device can be conveniently disassembled and assembled, and the working time is saved.
3. The lower end of the sand control cover of the sand storage pipe device is provided with teeth, so that when sand enters the sand storage cylinder, the sand control cover can conveniently move down to block the through hole on the sand storage cylinder.
4. The periphery of the hydraulic oil pipe is provided with the movable telescopic toothed cutters, sand which meets the clamp in each direction can be beaten and loosened, and the teeth at the front ends of the toothed cutter structures are convenient for beating and loosening the sand.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic view of a hydraulic oil pipe and a toothed cutter mounting structure according to the present invention;
FIG. 4 is a sectional view of a hydraulic oil pipe and a serrated knife mounting structure in the present invention;
FIG. 5 is a schematic view of the serrated knife of the present invention;
FIG. 6 is a schematic view of a partial structure before releasing a sand jam in the present invention;
FIG. 7 is a schematic view of a partial structure of the sand jam releasing device of the present invention.
In the figure: 1 well, 2 pipe columns, 201 sand control pipes, 202 outer oil pipes, 3 sand storage pipe devices, 31 sand storage cylinders, 3101 connecting plates, 3102 rotary sealing joints, 3103 through holes, 32 hydraulic oil pipes, 3201 branch pipes, 3202 oil ports, 33 cylinders, 34 sand control covers, 35 toothed cutters, 3501 connecting rods, 3502 pistons, 3503 sealing rings and 4 pipeline joints.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a sand blocking prevention safety joint for underground operation of oil exploitation comprises a pipe column 2 positioned in a well 1, wherein one end, close to an opening of the well 1, of the pipe column 2 is detachably connected with a sand prevention pipe 201, the other end of the pipe column is detachably connected with a plurality of coaxially-mounted sand storage pipe devices 3, and every two adjacent sand storage pipe devices 3 are fixedly connected through a pipeline joint 4;
as shown in fig. 1-2, the sand storage device 3 includes a sand storage cylinder 31 in threaded connection with the end of the pipe column 2, a coaxial hydraulic oil pipe 32 is fixedly installed in the sand storage cylinder 31, connecting plates 3101 are fixedly installed on the inner walls of the two ends of the sand storage cylinder 31, the hydraulic oil pipe 32 is fixedly installed on the connecting plates 3101, and the two ends of the hydraulic oil pipe 32 are detachably connected with the outer oil pipe 202 through rotary sealing joints 3102. When the number of the sand storage pipe devices 3 is more than two, the end part of the sand storage pipe device 3 which is farthest away from the pipe column 2 is provided with a sealing structure.
A plurality of symmetrically distributed branch pipes 3201 are fixedly communicated with the side wall of the hydraulic oil pipe 32, a connecting rod 3501 is movably inserted in the branch pipes 3201, the inner end of the connecting rod 3501 is fixedly connected with a piston 3502, and an oil port 3202 communicated with the side hydraulic oil pipe is further formed in the branch pipe 3201.
As shown in fig. 4-5, the piston 3502 is located between the inner end of the branch 3201 and the oil port 3202, the outer side of the piston 3502 is provided with a sealing ring 3503 and is in sealing contact with the inner wall of the branch 3201, the hydraulic oil is alternately injected into the outer oil pipe 202 and the side hydraulic oil pipe by the hydraulic pump, and the piston 3502 is pushed to reciprocate hydraulically.
The outer end of connecting rod 3501 is fixed connection serrated knife 35, and a plurality of serrated knives 35 are central symmetry and distribute in the hydraulic pressure oil pipe 32 outside, deposit sand cylinder 31 on the lateral wall corresponding serrated knife 35's position and seted up through-hole 3103, serrated knife 35 can pass through-hole 3103 and extend to depositing the sand cylinder 31 outside.
As shown in fig. 4-5, two connecting rods 3501 are disposed on one of the toothed cutters 35, and two branch pipes 3201 are disposed on the hydraulic oil pipe 32 corresponding to one of the toothed cutters 35, wherein the toothed cutters 35 are parallel to the axis of the hydraulic oil pipe 32.
Deposit one side fixed mounting that is close to tubular column 2 in the sand section of thick bamboo 31 has cylinder 33, the drive end fixed connection sand control cover 34 of cylinder 33, the activity of sand control cover 34 is located the inboard of through-hole 3103, and with deposit a sand section of thick bamboo 31 internal contact, sand control cover 34 is both ends opening, hollow cylindrical structure, the external diameter of sand control cover 34 is unanimous with depositing a sand section of thick bamboo 31 internal diameter, and sand control cover 34 bottom is equipped with the sawtooth structure, sand control cover 34 can be under the drive of cylinder 33, the activity covers in the inboard of through-hole 3103.
The sand blocking prevention operation method for the underground operation of oil exploitation adopts the safety joint and comprises the following specific steps:
s1: putting the pipe column 2 provided with the sand storage pipe device 3 down to the well 1 for normal work;
s2: when the safety joint cannot be separated when the underground is blocked, the air cylinder 33 contracts, the sand control cover 34 exposes the through hole 3103 on the sand storage cylinder 31, and partial sand at the blocked position enters the sand storage cylinder 31, so that the blocking condition is reduced or the blocking is eliminated;
s3: as shown in fig. 6-7, if the stuck condition is not released, the hydraulic pump injects hydraulic oil alternately into the outer oil pipe 202 and the side hydraulic oil pipe, so as to drive the piston 3502 to reciprocate in the branch pipe 3201, so that the toothed cutter 35 passes through the through hole 3103 to repeatedly impact the sand pile at the stuck position, so that the sand at the stuck position is loosened and enters the sand storage barrel 31, thereby releasing the stuck condition;
s4: after the blockage is released, the serrated knife 35 is retracted into the sand storage cylinder 31, and the air cylinder 33 is extended out, so that the sand control cover 34 covers the inner side of the through hole 3103 on the sand storage cylinder 31 to block the through hole 3103;
s5: and lifting the pipe column 2, taking down the sand storage pipe device 3 and pouring out the sand in the sand storage pipe device, so as to be convenient for next use.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an oil development borehole operation sand control card safety joint, includes tubular column (2) that are located well (1), its characterized in that: one end of the pipe column (2) close to the opening of the well (1) is detachably connected with a sand control pipe (201), the other end of the pipe column is detachably connected with a plurality of coaxially-mounted sand storage pipe devices (3), and two adjacent sand storage pipe devices (3) are fixedly connected through a pipeline joint (4);
the sand storage pipe device (3) comprises a sand storage barrel (31) in threaded connection with the end part of the pipe column (2), a coaxial hydraulic oil pipe (32) is fixedly installed in the sand storage barrel (31), a plurality of symmetrically distributed branch pipes (3201) are fixedly communicated and arranged on the side wall of the hydraulic oil pipe (32), a connecting rod (3501) is movably inserted in each branch pipe (3201), a piston (3502) is fixedly connected to the inner end of each connecting rod (3501), and an oil port (3202) communicated with the side hydraulic oil pipe is further formed in each branch pipe (3201);
the outer end of the connecting rod (3501) is fixedly connected with a toothed cutter (35), the toothed cutters (35) are distributed on the outer side of the hydraulic oil pipe (32) in a central symmetry mode, through holes (3103) are formed in the side wall of the sand storage barrel (31) corresponding to the toothed cutter (35), and the toothed cutter (35) can extend towards the outer side of the sand storage barrel (31) through the through holes (3103);
deposit one side fixed mounting that is close to tubular column (2) in sand section of thick bamboo (31) have cylinder (33), the drive end fixed connection sand control cover (34) of cylinder (33), sand control cover (34) activity is located the inboard of through-hole (3103) and with deposit sand section of thick bamboo (31) internal contact.
2. The sand jam prevention safety joint for oil extraction downhole operations of claim 1, wherein: deposit on the inner wall at sand section of thick bamboo (31) both ends fixed mounting have connecting plate (3101), fixed mounting has on connecting plate (3101) hydraulic pressure oil pipe (32), two tip of hydraulic pressure oil pipe (32) can dismantle through rotary seal joint (3102) and connect outer oil pipe (202).
3. The sand jam prevention safety joint for oil extraction downhole operations of claim 2, wherein: and the outer oil pipe (202) and the side hydraulic oil pipe are alternately filled with hydraulic oil through a hydraulic pump.
4. The sand jam prevention safety joint for oil extraction downhole operations of claim 1, wherein: the piston (3502) is located between the inner end of the branch pipe (3201) and the oil port (3202), and a sealing ring (3503) is arranged on the outer side of the piston (3502) and is in sealing contact with the inner wall of the branch pipe (3201).
5. The sand jam prevention safety joint for oil extraction downhole operations of claim 1, wherein: two connecting rods (3501) are arranged on one toothed cutter (35), two branch pipes (3201) are arranged on the hydraulic oil pipe (32) corresponding to one toothed cutter (35), and the toothed cutter (35) is parallel to the axis of the hydraulic oil pipe (32).
6. The sand jam prevention safety joint for oil extraction downhole operations of claim 1, wherein: the sand control cover (34) is of a hollow cylindrical structure with openings at two ends, the outer diameter of the sand control cover (34) is consistent with the inner diameter of the sand storage cylinder (31), and a sawtooth structure is arranged at the bottom of the sand control cover (34).
7. An oil exploitation downhole operation sand control operation method, characterized in that the safety joint according to any one of claims 1-6 is adopted, and the specific steps are as follows:
s1: the pipe column (2) provided with the sand storage pipe device (3) is put under the well (1) to work normally;
s2: when the safety joint cannot be separated when the underground is blocked, the air cylinder (33) contracts, the sand control cover (34) exposes the through hole (3103) on the sand storage cylinder (31), and partial sand at the blocked position enters the sand storage cylinder (31), so that the blocking condition is relieved or the blocking is relieved;
s3: if the situation of blocking is not relieved, hydraulic oil is alternately injected into the outer oil pipe (202) and the side hydraulic oil pipe through the hydraulic pump, the piston (3502) is driven to do reciprocating motion in the branch pipe (3201), so that the toothed cutter (35) passes through the through hole (3103) to repeatedly impact a sand pile at the blocking position, sand at the position of the sand blocking position is loosened and enters the sand storage cylinder (31), and the blocking is relieved;
s4: after the blockage is released, the toothed cutter (35) is retracted into the sand storage cylinder (31), the air cylinder (33) extends out, so that the sand control cover (34) covers the inner side of the through hole (3103) on the sand storage cylinder (31) to block the through hole (3103);
s5: and lifting the pipe column (2), taking down the sand storage pipe device (3) and pouring out the sand in the sand storage pipe device, so as to be convenient for next use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216706.3A CN112343531B (en) | 2020-11-04 | 2020-11-04 | Sand-blocking-prevention safety joint for downhole operation of oil exploitation and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216706.3A CN112343531B (en) | 2020-11-04 | 2020-11-04 | Sand-blocking-prevention safety joint for downhole operation of oil exploitation and operation method |
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| CN112343531A CN112343531A (en) | 2021-02-09 |
| CN112343531B true CN112343531B (en) | 2022-04-08 |
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| US4964464A (en) * | 1989-10-31 | 1990-10-23 | Mobil Oil Corporation | Anti-sand bridge tool and method for dislodging sand bridges |
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| CN102352730A (en) * | 2011-10-27 | 2012-02-15 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Process for handling accident of jamming of drilling tool by settled sand |
| CN103573226A (en) * | 2012-07-24 | 2014-02-12 | 思达斯易能源技术(集团)有限公司 | Well completion sand prevention process and sand prevention strings thereof |
| CN107642341A (en) * | 2017-09-15 | 2018-01-30 | 刘玉友 | Use method of loose sand type petroleum underground safety joint |
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2020
- 2020-11-04 CN CN202011216706.3A patent/CN112343531B/en active Active
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| US4964464A (en) * | 1989-10-31 | 1990-10-23 | Mobil Oil Corporation | Anti-sand bridge tool and method for dislodging sand bridges |
| CN2486734Y (en) * | 2001-04-29 | 2002-04-17 | 中国石油天然气股份有限公司 | Double sand holding bucket downhole bailing tub |
| CN102352730A (en) * | 2011-10-27 | 2012-02-15 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Process for handling accident of jamming of drilling tool by settled sand |
| CN103573226A (en) * | 2012-07-24 | 2014-02-12 | 思达斯易能源技术(集团)有限公司 | Well completion sand prevention process and sand prevention strings thereof |
| CN107642341A (en) * | 2017-09-15 | 2018-01-30 | 刘玉友 | Use method of loose sand type petroleum underground safety joint |
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