CN114198036A - Flushing head, negative pressure sand flushing device with same and use method of negative pressure sand flushing device - Google Patents
Flushing head, negative pressure sand flushing device with same and use method of negative pressure sand flushing device Download PDFInfo
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- CN114198036A CN114198036A CN202111429435.4A CN202111429435A CN114198036A CN 114198036 A CN114198036 A CN 114198036A CN 202111429435 A CN202111429435 A CN 202111429435A CN 114198036 A CN114198036 A CN 114198036A
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- 239000004576 sand Substances 0.000 title claims abstract description 164
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 162
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims description 98
- 238000004519 manufacturing process Methods 0.000 claims description 50
- 238000005507 spraying Methods 0.000 claims description 48
- 239000007921 spray Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 13
- 210000001503 joint Anatomy 0.000 claims description 12
- 239000013049 sediment Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 238000003032 molecular docking Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a flushing head, a negative pressure sand flushing device with the flushing head and a using method of the negative pressure sand flushing device. The flushing head, the negative pressure sand flushing device with the flushing head and the use method of the negative pressure sand flushing device are used for carrying out negative pressure sand flushing and gas injection sand return aiming at an oil-gas well which is low in formation pressure and easy to leak, so that the sand flushing efficiency is improved, the sand return effect is improved, and pollution to the formation is avoided due to the fact that liquid is returned to the ground.
Description
Technical Field
The invention relates to the technical field of sand washing through oil pipes, in particular to a washing head, a negative-pressure sand washing device with the washing head and a using method of the negative-pressure sand washing device.
Background
Deepwater oil and gas is one of the hot spots of future energy research, and the enlargement of deepwater oil and gas exploration and development is one of the important contents for building oceans and strengthening nations and guaranteeing national energy safety, but the severe and complex ocean environment and the difficult process conditions are the challenges often faced by deepwater oil and gas development, so that the exploitation cost and well repair cost of deepwater oil and gas exploitation are several times of those of conventional oil and gas exploitation. The operation of the immobile pipe column avoids the disassembly and assembly of the underwater Christmas tree, and is the primary choice of the deepwater oil-gas well.
At present, a continuous double-layer oil pipe is usually selected as a running pipe column for sand washing of a deepwater production well, a washing head is arranged at the bottom end of the running pipe column for high-speed sand washing, and for a large-size production oil pipe, if simple continuous oil pipe positive circulation sand washing operation is adopted, the continuous oil pipe is small in size, large in annular space between the oil pipe and the continuous oil pipe, high in sand washing pressure and poor in sand return effect. For a low-pressure production well, because the pressure of a sand washing liquid column is greater than the pressure of a stratum, the sand washing liquid leaks to the stratum, so that the sand washing efficiency is low, and the reservoir pollution caused by the inflow of the sand washing liquid to the stratum also occurs.
Disclosure of Invention
The invention aims to provide a flushing head, a negative pressure sand flushing device with the flushing head and a using method of the negative pressure sand flushing device, and aims to solve the problems of poor sand return effect, low sand flushing efficiency, reservoir pollution and the like in the existing deepwater well repairing process.
The invention provides a flushing head, which comprises a connecting pipe, a rotary pipe sleeve, a plurality of nozzles and a guide head, wherein the connecting pipe comprises an integrally formed butt joint part and a liquid spraying part, the upper end of an internal pipeline of the butt joint part is large, the lower end of the internal pipeline of the butt joint part is small, a plurality of connecting pipe liquid outlets are arranged on the pipe wall of the liquid spraying part of the connecting pipe, and the internal pipeline of the connecting pipe is communicated with the connecting pipe liquid outlets; the rotary pipe sleeve comprises an outer rotary pipe and an inner sleeve, the outer rotary pipe is arranged outside the inner sleeve, and the outer rotary pipe and the inner sleeve are connected through a bearing so that the outer rotary pipe can rotate; an annular space between the outer rotating pipe and the inner sleeve forms an inner cavity; the two ends of the rotary pipe sleeve are respectively provided with four nozzles in an inclined manner, the middle part of an outer rotary pipe of the rotary pipe sleeve is vertically provided with a plurality of liquid spraying ports, an inner sleeve of the rotary pipe sleeve is provided with a plurality of liquid inlets, the liquid inlets of the inner sleeve of the rotary pipe sleeve are communicated with the inner cavity, and the inner cavity is communicated with the nozzles and the liquid spraying ports of the outer rotary pipe of the rotary pipe sleeve; an inner sleeve of the rotary pipe sleeve is sleeved on the connecting pipe, and a liquid inlet on the inner sleeve of the rotary pipe sleeve is respectively and correspondingly communicated with a liquid outlet of the connecting pipe; the upper end of the guide head is small, the lower end of the guide head is large, and the guide head is buckled at the bottom end of the liquid spraying part of the connecting pipe.
Preferably, the bottom end of the liquid spraying part of the connecting pipe is provided with a bayonet, and the upper end of the guide head is buckled on the bayonet of the liquid spraying part.
Preferably, sealing strips are arranged at two ends between the rotary pipe sleeve and the connecting pipe in a sealing manner; butt joint portion (110) with the transition district of hydrojet portion is equipped with first step, the bayonet socket department of hydrojet portion forms the second step, two the sealing strip overlaps respectively to be established at first step and second step on the outer wall of hydrojet portion, rotatory pipe box suit is in on the pipe wall of hydrojet portion.
The invention also relates to a negative pressure sand washing device, which is operated in a deep well to be repaired and comprises a pipe core assembly, a sleeve assembly and the washing head, wherein the pipe core assembly comprises an upper double-wall oil pipe, a negative pressure generator, a sealing flow divider and a lower double-wall oil pipe which are sequentially arranged from top to bottom, and the upper double-wall oil pipe and the lower double-wall oil pipe are both of double-layer pipe structures formed by sleeving an inner oil pipe on an outer oil pipe; a gas-liquid mixer is arranged inside the outer oil pipe of the upper double-wall oil pipe; the flushing head is arranged at the bottom end of the inner oil pipe of the lower double-wall oil pipe, and an inlet of the butt joint part of the connecting pipe is communicated with the inner oil pipe of the lower double-wall oil pipe; the casing assembly comprises a production oil pipe, a production casing, a sieve pipe and a plurality of packers, wherein the sediment sand is arranged at the bottom of the deep well to be repaired, the sieve pipe extends downwards to the sediment sand, the production casing is in butt joint with the sieve pipe, the production oil pipe is arranged inside the production casing, and the production casing and the production oil pipe are separated by arranging the plurality of packers at intervals; the pipe core assembly is arranged in the production oil pipe, and the flushing head is positioned right above the deposited sand.
Preferably, a liquid inlet of the gas-liquid mixer is butted with an inner oil pipe of the upper double-walled oil pipe; spray holes are uniformly distributed on the shell of the gas-liquid mixer to form spray heads, and the spray heads and the outer oil pipe of the upper double-wall oil pipe jointly enclose a gas spraying area; the negative pressure generator is provided with an inner layer pipe and an outer layer pipe, and a first alternating current port is arranged between the inner layer pipe and the outer layer pipe of the negative pressure generator and is used for fluid to flow between the inner layer pipe and the outer layer pipe of the negative pressure generator; the top end of the inner layer pipe of the negative pressure generator is communicated with the air injection zone and is used for receiving the fluid in the air injection zone; the sealing flow divider is of a double-layer pipe body structure with an inner layer pipe and an outer layer pipe; the bottom end of the inner layer pipe of the negative pressure generator is communicated with the inner layer pipe of the sealed flow divider, and the outer layer pipe of the negative pressure generator is communicated with the outer layer pipe of the sealed flow divider; a second alternating current port is formed at the joint of the outer layer pipe of the negative pressure generator and the outer layer pipe of the sealed flow divider and used for fluid to flow between the inside and the outside of the outer layer pipe of the sealed flow divider; the top end of the inner oil pipe and the top end of the outer oil pipe of the lower double-wall oil pipe are respectively butted with the bottom end of the inner layer pipe and the bottom end of the outer layer pipe of the sealed flow divider;
preferably, the first communication port is located above the negative pressure generator; the second alternating current port is positioned below the first alternating current port.
The invention also relates to a use method of the negative pressure sand washing pipe column device, which is used for operating in a deep well to be repaired and comprises the following steps:
step S1: determining a deep well to be repaired, and sequentially putting a sieve tube, a production sleeve and a production oil pipe into the deep well to be repaired to form a sleeve assembly;
step S2: a pipe core assembly is put into the production oil pipe, the flushing head is positioned right above the deposited sand, and the height of the upper double-wall oil pipe is kept to be positioned at the wellhead position of the deep well to be repaired;
step S3: continuing to lower the pipe core assembly, and probing the sand surface of the deposited sand by using a flushing head to determine the sand surface position of the deposited sand; lifting the pipe core assembly to enable the flushing head to leave the position of the sand surface of the deposited sand;
step S4: negative pressure sand washing
Injecting sand washing liquid into the annular space between the outer oil pipe of the upper double-wall oil pipe and the production oil pipe, and slowly descending the pipe core assembly;
the sand washing liquid flows through the annular space between the outer oil pipe of the upper double-wall oil pipe and the production oil pipe, falls downwards to the sealed flow divider and is gathered, and flows into the inner pipe of the sealed flow divider from the outer pipe of the sealed flow divider through the second alternating current port;
one part of the sand washing liquid passes through an inner oil pipe of the lower double-wall oil pipe downwards and directly enters the flushing head downwards, and the sand washing liquid is jetted outwards from the flushing head; the sand washing liquid is accumulated at the bottom of the deep well to be repaired to form sand return liquid more and more; the sand return liquid enters the lower double-wall oil pipe upwards through an annular space between the outer oil pipe and the inner oil pipe of the lower double-wall oil pipe, rises to the negative pressure generator, and flows into the inner pipe of the negative pressure generator from the outer pipe of the negative pressure generator through the first alternating current port;
the other part of the sand washing liquid upwards enters the negative pressure generator, is sprayed out at a high speed by the negative pressure generator, is mixed with the sand returning liquid above the negative pressure generator and continuously flows upwards to the air spraying area;
step S5: and after the deposited sand at the bottom of the deep well to be repaired is washed, the pipe core assembly is retracted.
Further, the negative pressure sand washing is carried out while the negative pressure sand washing is carried out, and the gas injection sand return method further comprises the following steps:
high-pressure gas is injected into the inner oil pipe of the upper double-wall oil pipe,
and high-pressure gas is sprayed out from a spray head of the gas-liquid mixer through the gas-liquid mixer to enter a gas spraying area, is mixed with the sand-returning liquid in the gas spraying area, and continuously flows upwards to a wellhead of the deep well to be repaired, so that the whole process of negative-pressure sand washing and well washing is completed.
Furthermore, in the process of outward injection of the sand washing liquid from the washing head liquid flow, the sand washing liquid directly enters the washing head downwards after passing through an inner oil pipe of a lower double-wall oil pipe, enters an inner pipeline from an inlet at the upper end of a connecting pipe, flows out from a liquid outlet of the connecting pipe after passing through the inner pipeline, enters a liquid inlet of a sleeve pipe in the rotary pipe sleeve, is collected in an inner cavity, and is respectively divided into three liquid flows from nozzles at two ends of the rotary pipe sleeve and a liquid injection port in the middle of the rotary pipe sleeve to be injected outwards.
Further, the liquid spraying nozzles at two ends of the rotary pipe sleeve and the liquid spraying port in the middle of the rotary pipe sleeve are divided into three liquid flows to be sprayed outwards, and the three liquid flows comprise:
the nozzle positioned in front obliquely sprays sand washing liquid forwards, and the sand washing liquid impacts deposited sand at the well bottom of the deep well to be repaired and on the pipe wall of the sieve pipe;
the rear nozzle sprays sand washing liquid after inclining, and the sand washing liquid washes the pipe wall of the sieve pipe of the deep well to be repaired upwards;
the liquid spraying port in the middle of the rotary pipe sleeve sprays sand washing liquid along the direction tangential to the radial direction of the rotary pipe sleeve, the sand washing liquid impacts the pipe wall of the sieve pipe of the deep well to be repaired, and meanwhile, rotary force is generated to drive the rotary pipe sleeve to perform circular rotary motion.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a flushing head, a negative pressure sand flushing device with the flushing head and a use method of the negative pressure sand flushing device.
In addition, the invention discloses a flushing head, a negative pressure sand flushing device with the flushing head and a using method of the negative pressure sand flushing device, and the negative pressure sand flushing device also has the following advantages:
(1) according to the invention, high-pressure gas is injected into the sand-returning fluid through the gas-liquid mixer, so that the sand-returning speed is increased, and the sand-returning efficiency is improved; the negative pressure generator has a pumping effect on the sand return liquid and is matched with the gas-liquid mixer to realize the double sand return promotion effect;
(2) the rotary sand washing device generates rotary sand washing through the washing head, has wide sand washing liquid impact range, strong sand washing capacity, strong sand carrying capacity and low operation cost, and reduces the damage of the sand washing liquid to an oil layer.
Drawings
Fig. 1 is a schematic structural view of a rinse head provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a connection pipe provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a rotary pipe sleeve provided in embodiment 1 of the present invention;
fig. 4 is a longitudinal sectional view of a rotary pipe sleeve provided in embodiment 1 of the present invention;
fig. 5 is a transverse sectional view of a rotary pipe sleeve provided in example 1 of the present invention;
fig. 6 is a schematic structural diagram of a guide head provided in embodiment 1 of the present invention;
fig. 7 is a schematic structural view of a negative pressure sand washing device provided in embodiment 2 of the present invention;
FIG. 8 is a schematic structural view of a tube core assembly provided in example 2 of the present invention;
FIG. 9 is an enlarged view of the inlet and outlet of the negative pressure generator in the tube core assembly according to embodiment 2 of the present invention;
FIG. 10 is a schematic structural view of a sleeve assembly according to embodiment 2 of the present invention;
FIG. 11 is an overall schematic view of the flow of the sand washing liquid, the sand return liquid and the gas injection in the negative pressure sand washing device provided in embodiment 3 of the present invention;
FIG. 12 is an enlarged view of a portion of the flow of sand wash fluid, sand return fluid and injected gas through the negative pressure generator and the seal diverter provided in example 3 of the present invention.
Description of reference numerals:
1-a flushing head, 11-a connecting pipe, 110-a butt joint part, 111-a liquid spraying part, 112-a connecting pipe liquid outlet, 113-a bayonet, 114-a first step, 115-a second step, 12-a rotary pipe sleeve, 120-an inner cavity, 121-a liquid spraying port, 13-a nozzle, 14-a sealing strip and 15-a guide head;
2-a pipe core assembly, 21-an upper double-walled oil pipe, 22-a lower double-walled oil pipe, 200-an air injection region, 201-an inner oil pipe, 202-an outer oil pipe, 23-an air-liquid mixer, 24-a negative pressure generator, 240-a first alternating port, and 25-a sealed flow divider; 250-a second ac port;
3-casing assembly, 31-production tubing, 32-production casing, 33-screen, 34-sand deposition, 35-packer.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1: flushing head
Referring to fig. 1, the flushing head 1 comprises a connecting pipe 11, a rotary pipe sleeve 12, a number of nozzles 13, two sealing strips 14 and a guide head 15,
referring to fig. 2, the connection pipe 11 includes a docking portion 110 and a liquid spraying portion 111, an upper end of an inner conduit of the docking portion 110 is large, a lower end is small, an inner conduit of the liquid spraying portion 111 is cylindrical with an equal cross section, a bottom end of the docking portion 110 is fixedly connected with the liquid spraying portion 111 to be integrally formed, and the inner conduit of the docking portion 110 and the inner conduit of the liquid spraying portion 111 are communicated with each other to form the inner conduit of the connection pipe 11; the rotary pipe sleeve 12 is fitted over the liquid ejecting portion 111. Correspondingly, the upper end of the butt joint part 110 is large, and the lower end is small and is conical; the liquid ejecting portion 111 has a cylindrical shape.
A plurality of connecting pipe liquid outlets 112 are arranged on the pipe wall of the liquid spraying part 111 of the connecting pipe 11, and an internal pipeline of the connecting pipe 11 is communicated with the connecting pipe liquid outlets 112;
specifically, the rotary pipe sleeve 12 comprises an outer rotary pipe and an inner sleeve, the outer rotary pipe is arranged outside the inner sleeve, and the outer rotary pipe and the inner sleeve are connected through a bearing so that the outer rotary pipe can rotate; the circumferential space between the outer rotating tube and the inner sleeve forms an inner lumen 120.
Referring to fig. 3 to 5, two ends of the rotary pipe sleeve 12 are respectively provided with four nozzles 13 in an inclined manner, the middle of an outer rotary pipe of the rotary pipe sleeve 12 is vertically provided with a plurality of liquid spraying ports 121, an inner sleeve of the rotary pipe sleeve 12 is provided with a plurality of liquid inlets, the liquid inlet of the inner sleeve of the rotary pipe sleeve 12 is communicated with an inner cavity 120, and the inner cavity 120 is communicated with the nozzles 13 and the liquid spraying ports 121 of the outer rotary pipe of the rotary pipe sleeve 12; an inner sleeve of the rotary pipe sleeve 12 is sleeved on the connecting pipe 11, and a liquid inlet on the inner sleeve of the rotary pipe sleeve 12 is respectively and correspondingly communicated with a liquid outlet 112 of the connecting pipe.
Referring to fig. 6, the upper end of the guide head 15 is small and the lower end is large, and the guide head 15 is snapped on the connection pipe 11.
Specifically, the bottom end of the liquid spraying part 111 of the connection pipe 11 is provided with a bayonet 113, and the upper end of the guide head 15 is buckled with the bayonet 113 of the liquid spraying part 111.
Sealing strips 14 are respectively arranged at two ends between the rotary pipe sleeve 12 and the connecting pipe 11 in a sealing way.
Specifically, a first step 114 is arranged at a transition region of the abutting portion 110 and the liquid spraying portion 111, a second step 115 is formed at a bayonet 113 of the liquid spraying portion 111, the two sealing strips 14 are respectively sleeved on outer walls of the liquid spraying portions 111 of the first step 114 and the second step 115, and the rotary pipe sleeve 12 is sleeved on a pipe wall of the liquid spraying portion 111.
When liquid enters the inner pipeline from the inlet at the upper end of the connecting pipe 11, flows out from the liquid outlet 112 of the connecting pipe after passing through the inner pipeline, enters the liquid inlet of the inner sleeve of the rotary pipe sleeve 12, is collected in the inner cavity 120, and finally forms three liquid flows to be sprayed outwards from the nozzles 13 and the liquid spraying ports 121 at the two ends.
Example 2: negative pressure sand washing device
Referring to fig. 7, the negative pressure sand washing device further comprises a tube core assembly 2 and a tube assembly 3,
referring to fig. 8, the tube core assembly 2 includes an upper double-walled oil tube 21, a negative pressure generator 24, a seal-diverter 25 and a lower double-walled oil tube 22 arranged in this order from top to bottom,
the upper double-wall oil pipe 21 and the lower double-wall oil pipe 22 are both double-layer pipe structures formed by sleeving the inner oil pipe 201 on the outer oil pipe 202;
a gas-liquid mixer 23 is arranged inside the outer oil pipe 202 of the upper double-walled oil pipe 21, and a liquid inlet of the gas-liquid mixer 23 is butted with the inner oil pipe 201 of the upper double-walled oil pipe 21;
specifically, a check valve is arranged in the gas-liquid mixer 23, spray holes are uniformly distributed on the shell of the gas-liquid mixer 23 to form spray heads, and the spray heads and the outer oil pipe 202 of the upper double-wall oil pipe 21 jointly enclose a gas spraying area 200;
referring to fig. 9, the negative pressure generator 24 has an inner tube and an outer tube, and a first alternating current port 240 is provided between the inner tube and the outer tube of the negative pressure generator 24 for fluid to flow between the inner tube and the outer tube of the negative pressure generator 24; and the first ac port 240 is located above the negative pressure generator 24;
the top end of the inner tube of the negative pressure generator 24 is in communication with the jet zone 200 for receiving fluid from the jet zone 200.
The sealed flow divider 25 is a double-layer tube structure having an inner layer tube and an outer layer tube. The bottom end of the inner layer pipe of the negative pressure generator 24 is communicated with the inner layer pipe of the sealed flow divider 25, and the outer layer pipe of the negative pressure generator 24 is communicated with the outer layer pipe of the sealed flow divider 25;
the joint of the outer layer pipe of the negative pressure generator 24 and the outer layer pipe of the sealed flow divider 25 is provided with a second alternating current port 250 for fluid to flow between the inside and the outside of the outer layer pipe of the sealed flow divider 25, wherein the second alternating current port 250 is positioned below the first alternating current port 240, as shown in fig. 8;
the top end of an inner oil pipe 201 and the top end of an outer oil pipe 202 of the lower double-wall oil pipe 22 are respectively butted with the bottom end of an inner layer pipe and the bottom end of an outer layer pipe of the sealed flow divider 25;
the flushing head 1 is arranged at the bottom end of the inner oil pipe 201 of the lower double-walled oil pipe 22, and the inlet of the butt joint part 110 of the connecting pipe 11 is communicated with the inner oil pipe 201 of the lower double-walled oil pipe 22.
Referring to fig. 10, casing assembly 3 comprises production tubing 31, production casing 32, screens 33 and packers 35, wherein the well bottom of the deep water well to be remediated has sediment sand 34.
Referring to FIG. 7, the screen 33 is extended downward to deposit sand 34, the production casing 32 is butted up with the screen 33, the production tubing 31 is disposed inside the production casing 32, and the production casing 32 and the production tubing 31 are separated by a plurality of packers 35 disposed at intervals;
the pipe core assembly 2 is placed inside the production tubing 31 with the flushing head 1 directly above the deposited sand 34.
Example 3: use method of negative-pressure sand washing pipe column device
step S1: determining a deep well to be repaired, and sequentially putting a sieve tube 33, a production sleeve 32 and a production oil tube 31 into the deep well to be repaired to form a sleeve assembly 3;
the method comprises the following steps that sediment sand 34 is arranged at the bottom of a deep water well to be repaired, a sieve pipe 33 extends downwards to the sediment sand 34, a production casing 32 is in butt joint with the sieve pipe 33, a production tubing 31 is arranged inside the production casing 32, and the production casing 32 and the production tubing 31 are separated by arranging a plurality of packers 35 at intervals;
step S2: lowering the pipe core assembly 2 into the production tubing 31 with the flushing head 1 positioned directly above the deposited sand 34 and maintaining the height of the upper double wall tubing 21 at the wellhead position of the deep well to be repaired;
wherein the length of the lower double-walled tubing 22 is greater than the length of the screen 33, and the seal diverter 25 is sealed from the inside of the production tubing 31;
step S3: the sand detection surface specifically comprises the following steps:
continuing to lower the pipe core assembly 2, probing the sand surface of the deposited sand 34 by using the washing head 1, and establishing the sand surface position of the deposited sand 34;
lifting the pipe core assembly 2 to enable the flushing head 1 to leave the sand surface position of the deposited sand 34;
step S4: negative pressure sand washing and gas injection sand return, referring to figures 11 and 12,
wherein, negative pressure sand washing includes the following steps:
injecting sand washing liquid into the annular space between the outer oil pipe 202 of the upper double-wall oil pipe 21 and the production oil pipe 31, and slowly descending the pipe core assembly 2;
the sand washing liquid flows through the annular space between the outer oil pipe 202 of the upper double-wall oil pipe 21 and the production oil pipe 31, falls downwards to the sealed flow divider 25 and is gathered, and flows from the outer layer pipe of the sealed flow divider 25 to the inner layer pipe of the sealed flow divider 25 through the second alternating current port 250;
a part of sand washing liquid passes through the inner oil pipe 201 of the lower double-wall oil pipe 22 downwards and directly enters the washing head 1 downwards, enters the inner pipeline from the inlet at the upper end of the connecting pipe 11, flows out from the liquid outlet 112 of the connecting pipe after passing through the inner pipeline, enters the liquid inlet of the inner sleeve of the rotary pipe sleeve 12, is collected in the inner cavity 120, and is divided into three liquid flows to be sprayed outwards from the nozzles 13 at the two ends of the rotary pipe sleeve 12 and the liquid spraying port 121 in the middle of the rotary pipe sleeve 12; wherein, the nozzle 13 positioned in front sprays sand washing liquid forward obliquely, the sand washing liquid impacts the bottom of the deep well to be repaired and the deposited sand 34 on the pipe wall of the sieve pipe 33, the nozzle 13 positioned in rear sprays sand washing liquid backward obliquely, the sand washing liquid washes the pipe wall of the sieve pipe 33 of the deep well to be repaired upwards, the liquid spraying port 121 in the middle of the rotating sleeve 12 sprays sand washing liquid along the direction tangential to the radial direction of the rotating sleeve 12, the sand washing liquid impacts the pipe wall of the sieve pipe 33 of the deep well to be repaired, and simultaneously, the rotating force is generated to drive the rotating sleeve 12 to rotate circumferentially;
the sand washing liquid is accumulated at the bottom of the deep well to be repaired to form sand return liquid more and more;
the sand return fluid enters the lower double-wall oil pipe 22 upwards through an annular space between the outer oil pipe 202 and the inner oil pipe 201 of the lower double-wall oil pipe 22, rises upwards to the negative pressure generator 24, and flows into the inner pipe of the negative pressure generator 24 from the outer pipe of the negative pressure generator 24 through the first alternating current port 240;
the other part of the sand washing liquid enters the negative pressure generator 24 upwards, is sprayed out at a high speed by the negative pressure generator 24, is mixed with the sand returning liquid above the negative pressure generator 24, and continuously flows upwards to the air spraying area 200;
the gas injection sand return method comprises the following steps:
injecting high-pressure gas into the inner oil pipe 201 of the upper double-wall oil pipe 21, spraying the high-pressure gas from a spray head of the gas-liquid mixer 23 into the gas spraying area 200 through the gas-liquid mixer 23, mixing the high-pressure gas with the sand-returning liquid in the gas spraying area 200, and continuously flowing upwards to a wellhead of a deep well to be repaired to finish the whole process of negative-pressure sand washing and well washing.
Step S5: and after the deposited sand 34 at the bottom of the deep well to be repaired is washed, the pipe core assembly 2 is collected.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A flushing head is characterized by comprising a connecting pipe (11), a rotary pipe sleeve (12), a plurality of nozzles (13) and a guide head (15),
the connecting pipe (11) comprises an abutting part (110) and a liquid spraying part (111) which are integrally formed, the upper end of an internal pipeline of the abutting part (110) is large, the lower end of the internal pipeline is small, a plurality of connecting pipe liquid outlets (112) are arranged on the pipe wall of the liquid spraying part (111) of the connecting pipe (11), and the internal pipeline of the connecting pipe (11) is communicated with the connecting pipe liquid outlets (112);
the rotary pipe sleeve (12) comprises an outer rotary pipe and an inner sleeve, the outer rotary pipe is arranged outside the inner sleeve, and the outer rotary pipe and the inner sleeve are connected through a bearing so that the outer rotary pipe can rotate; an inner cavity (120) is formed in the annular space between the outer rotating tube and the inner sleeve;
two ends of the rotary pipe sleeve (12) are respectively provided with four nozzles (13) in an inclined manner, the middle part of an outer rotary pipe of the rotary pipe sleeve (12) is vertically provided with a plurality of liquid spraying ports (121), an inner sleeve pipe of the rotary pipe sleeve (12) is provided with a plurality of liquid inlets, the liquid inlet of the inner sleeve pipe of the rotary pipe sleeve (12) is communicated with the inner cavity (120), and the inner cavity (120) is communicated with the nozzles (13) and the liquid spraying ports (121) of the outer rotary pipe of the rotary pipe sleeve (12);
an inner sleeve of the rotary pipe sleeve (12) is sleeved on the connecting pipe (11), and a liquid inlet on the inner sleeve of the rotary pipe sleeve (12) is correspondingly communicated with a liquid outlet (112) of the connecting pipe respectively;
the upper end of the guide head (15) is small, the lower end of the guide head is large, and the guide head (15) is buckled at the bottom end of the liquid spraying part (111) of the connecting pipe (11).
2. The rinse head of claim 1,
the bottom end of the liquid spraying part (111) of the connecting pipe (11) is provided with a bayonet (113), and the upper end of the guide head (15) is buckled with the bayonet (113) of the liquid spraying part (111).
3. The rinse head of claim 2,
sealing strips (14) are arranged at two ends between the rotary pipe sleeve (12) and the connecting pipe (11) in a sealing way;
butt joint portion (110) with the transition region of hydrojet portion (111) is equipped with first step (114), bayonet socket (113) department of hydrojet portion (111) forms second step (115), two sealing strip (14) are established respectively and are established first step (114) and second step (115) on the outer wall of hydrojet portion (111), rotatory pipe box (12) suit is in on the pipe wall of hydrojet portion (111).
4. Negative pressure sand washing device for deep wells to be rehabilitated, comprising a pipe core assembly (2), a casing assembly (3) and a washing head according to any of claims 1 to 3,
the pipe core assembly (2) comprises an upper double-wall oil pipe (21), a negative pressure generator (24), a sealing flow divider (25) and a lower double-wall oil pipe (22) which are sequentially arranged from top to bottom,
the upper double-wall oil pipe (21) and the lower double-wall oil pipe (22) are both double-layer pipe structures formed by sleeving an inner oil pipe (201) on an outer oil pipe (202); a gas-liquid mixer (23) is arranged inside an outer oil pipe (202) of the upper double-wall oil pipe (21);
the flushing head (1) is arranged at the bottom end of an inner oil pipe (201) of the lower double-wall oil pipe (22), and an inlet of a butt joint part (110) of the connecting pipe (11) is communicated with the inner oil pipe (201) of the lower double-wall oil pipe (22);
the casing assembly (3) comprises a production tubing (31), a production casing (32), a sieve tube (33) and a plurality of packers (35), wherein the bottom of the deep water well to be repaired is provided with sediment sand (34), the sieve tube (33) extends downwards to the sediment sand (34), the production casing (32) is butted with the sieve tube (33), the production tubing (31) is arranged inside the production casing (32), and the production casing (32) and the production tubing (31) are separated by arranging the plurality of packers (35) at intervals;
the pipe core assembly (2) is arranged inside the production oil pipe (31), and the flushing head (1) is positioned right above the deposited sand (34).
5. The negative pressure sand washing device according to claim 4,
a liquid inlet of the gas-liquid mixer (23) is butted with an inner oil pipe (201) of the upper double-wall oil pipe (21); spray holes are uniformly distributed on the shell of the gas-liquid mixer (23) to form spray heads, and the spray heads and the outer oil pipe (202) of the upper double-wall oil pipe (21) jointly enclose a gas spraying area (200);
the negative pressure generator (24) is provided with an inner layer pipe and an outer layer pipe, and a first alternating current port (240) is arranged between the inner layer pipe and the outer layer pipe of the negative pressure generator (24) and used for fluid to flow between the inner layer pipe and the outer layer pipe of the negative pressure generator (24); the top end of the inner layer pipe of the negative pressure generator (24) is communicated with the air injection area (200) and is used for receiving the fluid of the air injection area (200);
the sealing flow divider (25) is of a double-layer pipe body structure with an inner layer pipe and an outer layer pipe;
the bottom end of the inner layer pipe of the negative pressure generator (24) is communicated with the inner layer pipe of the sealed flow divider (25), and the outer layer pipe of the negative pressure generator (24) is communicated with the outer layer pipe of the sealed flow divider (25);
a second alternating current port (250) is arranged at the joint of the outer layer pipe of the negative pressure generator (24) and the outer layer pipe of the sealed flow divider (25) and is used for fluid to flow between the inside and the outside of the outer layer pipe of the sealed flow divider (25);
the top end of an inner oil pipe (201) and the top end of an outer oil pipe (202) of the lower double-wall oil pipe (22) are respectively butted with the bottom end of an inner layer pipe and the bottom end of an outer layer pipe of the sealed flow divider (25).
6. Negative pressure sand washing device according to claim 5, characterized in that the first alternating port (240) is located above the negative pressure generator (24); the second port (250) is located below the first port (240).
7. Use of the negative pressure sand washing pipe column device according to any one of claims 4 to 6 for deep water wells to be repaired, comprising
Step S1: determining a deep well to be repaired, and sequentially putting a sieve tube (33), a production casing (32) and a production oil pipe (31) into the deep well to be repaired to form a casing assembly (3);
step S2: -lowering the tubular core assembly (2) into the production tubing (31) with the flushing head (1) directly above the deposited sand (34) and maintaining the height of the upper double wall tubing (21) at the wellhead position of the deep well to be rehabilitated;
step S3: continuing to lower the pipe core assembly (2), and probing the sand surface of the deposited sand (34) by using the flushing head (1) to establish the sand surface position of the deposited sand (34); lifting the pipe core assembly (2) to enable the flushing head (1) to be away from the sand surface position of the deposited sand (34);
step S4: negative pressure sand washing
Injecting sand washing liquid into the annular space between the outer oil pipe (202) of the upper double-wall oil pipe (21) and the production oil pipe (31), and slowly descending the pipe core assembly (2);
the sand washing liquid flows through the annular space between the outer oil pipe (202) of the upper double-wall oil pipe (21) and the production oil pipe (31), falls downwards to the sealed flow divider (25) and is gathered, and flows into the inner pipe of the sealed flow divider (25) from the outer pipe of the sealed flow divider (25) through the second alternating current port (250);
a part of sand washing liquid passes through an inner oil pipe (201) of a lower double-wall oil pipe (22) downwards and directly enters the flushing head (1) downwards, and the sand washing liquid flows outwards from the flushing head (1); the sand washing liquid is accumulated at the bottom of the deep well to be repaired to form sand return liquid more and more; the sand return liquid enters the lower double-wall oil pipe (22) through an annular space between an outer oil pipe (202) and an inner oil pipe (201) of the lower double-wall oil pipe (22), rises to the negative pressure generator (24), and flows into an inner pipe of the negative pressure generator (24) from an outer pipe of the negative pressure generator (24) through a first alternating current port (240);
the other part of the sand washing liquid upwards enters the negative pressure generator (24), is sprayed out at high speed by the negative pressure generator (24), is mixed with the sand returning liquid above the negative pressure generator (24), and continuously flows upwards to the air spraying area (200);
step S5: after the deposited sand (34) at the bottom of the deep well to be repaired is washed, the pipe core assembly (2) is collected.
8. Use according to claim 7,
the negative pressure sand washing method further comprises gas injection sand return while the negative pressure sand washing is carried out, wherein the gas injection sand return specifically comprises the following steps:
high-pressure gas is injected into an inner oil pipe (201) of the upper double-wall oil pipe (21),
and high-pressure gas is sprayed out from a spray head of the gas-liquid mixer (23) through the gas-liquid mixer (23) to enter a gas spraying area (200), is mixed with sand return liquid in the gas spraying area (200), and continuously flows upwards to a wellhead of the deep well to be repaired, so that the whole process of negative-pressure sand washing and well washing is completed.
9. Use according to claim 7,
during outward injection of the sand washing liquid from the washing head (1), the sand washing liquid directly enters the washing head (1) downwards after passing through an inner oil pipe (201) of a double-wall oil pipe (22) at the lower part, the sand washing liquid enters an inner pipeline from an inlet at the upper end of a connecting pipe (11), flows out from a liquid outlet (112) of the connecting pipe after passing through the inner pipeline, enters a liquid inlet of an inner sleeve of a rotating pipe sleeve (12), is collected in an inner cavity (120), and is respectively divided into three liquid flows from nozzles (13) at two ends of the rotating pipe sleeve (12) and a liquid injection port (121) in the middle of the rotating pipe sleeve (12) to be injected outwards.
10. Use according to claim 9,
the liquid jet device is characterized in that the liquid jet device is divided into three liquid flows from nozzles (13) at two ends of the rotary pipe sleeve (12) and a liquid jet port (121) in the middle of the rotary pipe sleeve (12) to be jetted outwards, and the liquid jet device comprises:
the nozzle (13) positioned in front obliquely sprays sand washing liquid forward, and the sand washing liquid impacts the sediment sand (34) of the well bottom of the deep well to be repaired and the pipe wall of the sieve pipe (33);
the nozzle (13) positioned at the rear part sprays sand washing liquid after inclining, and the sand washing liquid washes the pipe wall of the sieve pipe (33) of the deep well to be repaired upwards;
the liquid jet port (121) in the middle of the rotary pipe sleeve (12) jets out sand washing liquid along the direction tangential to the radial direction of the rotary pipe sleeve (12), the sand washing liquid impacts the pipe wall of the screen pipe (33) of the deep well to be repaired, and simultaneously, the rotary force is generated to promote the rotary pipe sleeve (12) to carry out circular rotary motion.
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| CN202111429435.4A CN114198036B (en) | 2021-11-29 | 2021-11-29 | Flushing head, negative pressure sand flushing device with flushing head and use method of negative pressure sand flushing device |
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| CN202111429435.4A CN114198036B (en) | 2021-11-29 | 2021-11-29 | Flushing head, negative pressure sand flushing device with flushing head and use method of negative pressure sand flushing device |
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