CN114198036B - Flushing head, negative pressure sand flushing device with flushing head and use method of negative pressure sand flushing device - Google Patents
Flushing head, negative pressure sand flushing device with flushing head and use method of negative pressure sand flushing device Download PDFInfo
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- CN114198036B CN114198036B CN202111429435.4A CN202111429435A CN114198036B CN 114198036 B CN114198036 B CN 114198036B CN 202111429435 A CN202111429435 A CN 202111429435A CN 114198036 B CN114198036 B CN 114198036B
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- 239000004576 sand Substances 0.000 title claims abstract description 171
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 166
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims description 89
- 238000004519 manufacturing process Methods 0.000 claims description 50
- 238000005507 spraying Methods 0.000 claims description 49
- 238000007789 sealing Methods 0.000 claims description 44
- 239000007921 spray Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 210000001503 joint Anatomy 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 239000008358 core component Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 239000000306 component Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000003032 molecular docking Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development 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
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000001737 promoting effect Effects 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
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a flushing head, a negative pressure sand flushing device with the flushing head and a use method thereof, wherein the flushing head comprises a connecting pipe, a rotary pipe sleeve, a plurality of nozzles and a guide head, and the negative pressure sand flushing device comprises a pipe core assembly, a sleeve assembly and the flushing head. The flushing head, the negative pressure sand flushing device with the flushing head and the use method thereof disclosed by the invention aim at an oil-gas well with low formation pressure and easy leakage, perform negative pressure sand flushing and gas injection sand return, improve sand flushing efficiency, improve sand return effect and avoid pollution to the formation due to returning the re-liquid to the ground.
Description
Technical Field
The invention relates to the technical field of oil pipe sand washing, in particular to a washing head, a negative pressure sand washing device with the washing head and a use method of the negative pressure sand washing device.
Background
Deepwater oil gas is one of the hot spots of future energy research, and increasing deepwater oil gas exploration and development is one of important contents for constructing ocean countries and guaranteeing national energy safety, but the severe and complex ocean environment and the technological conditions which are difficult to meet are challenges faced by deepwater oil gas development frequently, so that the exploitation cost and well repair cost of deepwater oil gas exploitation are several times as high as those of conventional oil gas exploitation. The operation of the fixed string avoids the disassembly and assembly of the underwater Christmas tree, and is the primary choice of the deep water oil-gas well.
At present, a continuous double-layer oil pipe is often selected as a running pipe column for sand washing of a deep water production well, a flushing head is arranged at the bottom end of the continuous double-layer oil pipe for high-speed sand washing, and for large-size production oil pipes, if simple continuous oil pipe positive circulation sand washing operation is adopted, because the continuous oil pipe is smaller in size, the annular space of the oil pipe and the continuous oil pipe is larger, the sand washing pressure is high, and the sand returning effect is poor. For a low-pressure production well, because the pressure of the sand washing liquid column is larger than the formation pressure, the sand washing liquid leaks out to the formation, so that the sand washing efficiency is low, and the sand washing liquid flows into the formation to pollute a reservoir.
Disclosure of Invention
The invention aims to provide a flushing head, a negative pressure sand flushing device with the flushing head and a use method thereof, which are used for solving the problems of poor sand return effect, low sand flushing efficiency, reservoir pollution and the like in the existing deep water 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 a butt joint part and a liquid spraying part which are integrally formed, the upper end and the lower end of an inner pipeline of the butt joint part are large, the lower end of the inner pipeline is small, a plurality of connecting pipe liquid outlets are formed in the pipe wall of the liquid spraying part of the connecting pipe, and the inner 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; the annular space between the outer rotary tube and the inner sleeve tube forms an inner cavity; four nozzles are obliquely arranged at two ends of the rotary pipe sleeve respectively, a plurality of liquid spraying ports are vertically arranged in the middle of an outer rotary pipe of the rotary pipe sleeve, a plurality of liquid inlets are arranged on an inner sleeve of the rotary pipe sleeve, 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; the inner sleeve of the rotary pipe sleeve is sleeved on the connecting pipe, and the liquid inlets on the inner sleeve of the rotary pipe sleeve are respectively communicated with the liquid outlets of the connecting pipe correspondingly; 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, a bayonet is arranged at the bottom end of the liquid spraying part of the connecting pipe, 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 way; the transition area of the butt joint part (110) and the liquid spraying part is provided with a first step, the bayonet of the liquid spraying part is provided with a second step, two sealing strips are respectively sleeved on the outer walls of the liquid spraying parts of the first step and the second step, and the rotary sleeve is sleeved on the pipe wall of the liquid spraying part.
The invention also relates to a negative pressure sand washing device which is operated on a deep water well to be repaired, and comprises a tube core assembly, a sleeve assembly and the washing head, wherein the tube core assembly comprises an upper double-wall oil tube, a negative pressure generator, a sealing shunt and a lower double-wall oil tube which are sequentially arranged from top to bottom, and the upper double-wall oil tube and the lower double-wall oil tube are of double-layer tube structures formed by sleeving an inner oil tube on an outer oil tube; a gas-liquid mixer is arranged in 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 screen pipe and a plurality of packers, wherein deposited sand is arranged at the bottom of a deep well to be repaired, the screen pipe extends downwards into the deposited sand, the production casing is in butt joint with the screen pipe, the production oil pipe is arranged in the production casing, and the production casing and the production oil pipe are separated by a plurality of packers at intervals; the tube core assembly is arranged inside the production oil tube, and the flushing head is positioned right above the deposited sand.
Preferably, the liquid inlet of the gas-liquid mixer is in butt joint with the inner oil pipe of the upper double-wall oil pipe; spray holes are uniformly distributed on the shell of the gas-liquid mixer to form a spray head, and the spray head and an outer oil pipe of the upper double-wall oil pipe jointly enclose a spray area; the negative pressure generator is provided with an inner layer pipe and an outer layer pipe, and a first cross flow port is arranged between the inner layer pipe and the outer layer pipe of the negative pressure generator and used for enabling 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 area and is used for receiving fluid in the air injection area; the sealing shunt 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 sealing shunt, and the outer layer pipe of the negative pressure generator is communicated with the outer layer pipe of the sealing shunt; a second cross flow port is arranged at the joint of the outer layer pipe of the negative pressure generator and the outer layer pipe of the sealing shunt and is used for enabling fluid to flow from the inside to the outside of the outer layer pipe of the sealing shunt; 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 in butt joint with the bottom end of the inner layer pipe and the bottom end of the outer layer pipe of the sealing shunt;
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 the deep water well to be repaired and comprises the following steps:
step S1: determining a deep water well to be repaired, and sequentially putting a screen pipe, a production sleeve and a production oil pipe into the deep water well to be repaired to form a sleeve assembly;
step S2: a pipe core component 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 at the wellhead position of the deep water well to be repaired;
step S3: continuing to lower the tube core assembly, detecting the sand surface of the deposited sand by using a flushing head, and determining the sand surface position of the deposited sand; lifting the tube core assembly to enable the flushing head to leave the sand surface position 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 lowering the sand washing liquid into the pipe core assembly;
the sand washing liquid flows through the annulus of the outer oil pipe and the production oil pipe of the upper double-wall oil pipe, falls down to the sealing shunt and gathers, and flows into the inner layer pipe of the sealing shunt from the outer layer pipe of the sealing shunt through the second cross flow port;
part of sand washing liquid passes through the inner oil pipe of the lower double-wall oil pipe downwards and directly enters the washing head downwards, and the sand washing liquid is sprayed outwards from the washing head liquid; the sand washing liquid gathers more and more at the bottom of the deep water well to be repaired to form sand returning liquid; the sand returning liquid enters the lower double-wall oil pipe upwards through an annulus between an outer oil pipe and an inner oil pipe of the lower double-wall oil pipe, rises upwards to the negative pressure generator, and flows into an inner pipe of the negative pressure generator from an outer pipe of the negative pressure generator through a first cross flow port;
the other part of sand washing liquid upwards enters the negative pressure generator, is sprayed out at a high speed by the negative pressure generator, is mixed with sand returning liquid above the negative pressure generator, and continuously upwards flows to an air injection area;
step S5: and after the deposited sand at the bottom of the deep water well to be repaired is washed cleanly, the tube core assembly is collected.
Further, the negative pressure sand washing is carried out, and meanwhile, the method further comprises gas injection sand returning, and the gas injection sand returning specifically comprises the following steps:
injecting high-pressure gas into the inner oil pipe of the upper double-wall oil pipe,
the 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, and is mixed with sand returning liquid in the gas spraying area, and then flows upwards to a wellhead of a deep water well to be repaired, so that the whole process of negative-pressure sand flushing and well flushing is completed.
Further, in the process of outward spraying of the sand washing liquid from the flushing head liquid, the sand washing liquid directly enters the flushing head downwards after passing through the inner oil pipe of the lower double-wall oil pipe, enters the inner pipeline from the inlet at the upper end of the connecting pipe, flows out from the liquid outlet of the connecting pipe after passing through the inner pipeline, enters the liquid inlet of the inner sleeve of the rotary pipe sleeve, is converged in the inner cavity, and is respectively sprayed outwards from the nozzles at the two ends of the rotary pipe sleeve and the liquid spraying port in the middle of the rotary pipe sleeve.
Further, the 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 streams to spray outwards, and the liquid spraying device comprises:
the spray nozzle positioned in front sprays sand washing liquid obliquely forwards, and the sand washing liquid impacts deposited sand at the bottom of a well to be repaired and on the wall of a screen pipe;
the spray nozzle positioned at the rear is inclined and then sprays sand washing liquid, and the sand washing liquid washes the pipe wall of the screen pipe of the deep well to be repaired upwards;
the spray nozzle in the middle of the rotary pipe sleeve sprays sand washing liquid along the radial tangential direction of the rotary pipe sleeve, the sand washing liquid impacts the pipe wall of the screen pipe of the deep water well to be repaired, and simultaneously, 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 thereof, wherein a pipe core assembly can be put into the oil pipe for realizing sand flushing by one time, and negative pressure sand flushing and gas injection sand returning are carried out aiming at an oil-gas well with low formation pressure and easy leakage, so that the risk of drilling sticking operation is reduced, the sand flushing efficiency is improved, the sand returning effect is improved, the well repairing operation period is shortened, the operation cost is reduced, and the pollution to the stratum is avoided because the re-liquid is returned to the ground.
In addition, the invention discloses a flushing head, a negative pressure sand flushing device with the flushing head and a use method thereof, 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 liquid through the gas-liquid mixer, so that the sand returning speed is increased, and the sand returning efficiency is improved; the negative pressure generator is used for pumping the sand returning liquid, and the negative pressure generator is matched with the gas-liquid mixer to realize the effect of doubly promoting sand returning;
(2) The invention generates rotary sand washing through the washing head, has wide sand washing liquid impact range, strong sand washing capability, strong sand carrying capability and low operation cost, and reduces the damage of the sand washing liquid to an oil layer.
Drawings
Fig. 1 is a schematic structural diagram of a rinse head according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a connection pipe according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a rotary sleeve according to embodiment 1 of the present invention;
FIG. 4 is a longitudinal cross-sectional view of a swivel cuff provided in embodiment 1 of the invention;
FIG. 5 is a transverse cross-sectional view of a swivel cuff provided in embodiment 1 of the invention;
fig. 6 is a schematic structural diagram of a guide head according to embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a negative pressure sand washing device provided in embodiment 2 of the present invention;
fig. 8 is a schematic structural diagram of a die assembly according to embodiment 2 of the present invention;
FIG. 9 is a partial enlarged view of the inlet and outlet of the negative pressure generator in the die assembly provided in example 2 of the present invention;
FIG. 10 is a schematic structural view of a bushing assembly according to embodiment 2 of the present invention;
FIG. 11 is a schematic diagram showing the whole flow of the sand washing liquid, the sand returning liquid and the gas injection in the negative pressure sand washing device according to the embodiment 3 of the present invention;
fig. 12 is an enlarged view of a part of the sand washing liquid, the sand returning liquid and the gas injection flow through the negative pressure generator and the sealing shunt according to the embodiment 3 of the present invention.
Reference numerals illustrate:
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-tube core components, 21-upper double-wall oil tubes, 22-lower double-wall oil tubes, 200-gas spraying areas, 201-inner oil tubes, 202-outer oil tubes, 23-gas-liquid mixers, 24-negative pressure generators, 240-first cross flow ports and 25-sealing flow splitters; 250-a second cross flow port;
3-casing assembly, 31-production tubing, 32-production casing, 33-screen, 34-sediment, 35-packer.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1: flushing head
Example 1 provides a rinse head, the structure of which is described in detail below.
Referring to fig. 1, the flushing head 1 comprises a connection pipe 11, a swivel 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 spraying portion 111, an inner pipe of the docking portion 110 has a large upper end and a small lower end, the inner pipe of the spraying portion 111 has a cylindrical shape with an equal cross section, a bottom end of the docking portion 110 is fixedly connected with the spraying portion 111 to be integrally formed, and the inner pipe of the docking portion 110 and the inner pipe of the spraying portion 111 are communicated with each other to form an inner pipe of the connection pipe 11; the rotary sleeve 12 is fitted over the liquid ejecting portion 111. Correspondingly, the butt joint part 110 has a large upper end and a small lower end and is conical; the liquid ejecting section 111 is cylindrical.
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 inner pipeline of the connecting pipe 11 is communicated with the connecting pipe liquid outlets 112;
specifically, the rotary sleeve 12 includes an outer rotary tube and an inner sleeve, the outer rotary tube is disposed outside the inner sleeve, and the outer rotary tube and the inner sleeve are connected by a bearing so that the outer rotary tube can rotate; the annular space between the outer rotating tube and the inner sleeve forms an inner cavity 120.
Referring to fig. 3 to 5, four nozzles 13 are obliquely arranged at two ends of the rotary pipe sleeve 12 respectively, a plurality of liquid spraying ports 121 are vertically arranged in the middle of an outer rotary pipe of the rotary pipe sleeve 12, a plurality of liquid inlets are arranged on an inner sleeve of the rotary pipe sleeve 12, the liquid inlets of the inner sleeve of the rotary pipe sleeve 12 are 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; the inner sleeve of the rotary sleeve 12 is sleeved on the connecting pipe 11, and the liquid inlets on the inner sleeve of the rotary sleeve 12 are respectively communicated with the liquid outlets 112 of the connecting pipe correspondingly.
Referring to fig. 6, the guide head 15 has a small upper end and a large lower end, and the guide head 15 is engaged with the connection pipe 11.
Specifically, a bayonet 113 is provided at the bottom end of the liquid ejecting portion 111 of the connection pipe 11, and the upper end of the guide head 15 is engaged with the bayonet 113 of the liquid ejecting portion 111.
Sealing strips 14 are respectively arranged at two ends between the rotary sleeve 12 and the connecting pipe 11 in a sealing way.
Specifically, a first step 114 is provided at the transition area between the abutting portion 110 and the liquid spraying portion 111, a second step 115 is formed at the bayonet 113 of the liquid spraying portion 111, two sealing strips 14 are respectively sleeved on the outer walls of the liquid spraying portion 111 of the first step 114 and the second step 115, and the rotary sleeve 12 is sleeved on the pipe wall of the liquid spraying portion 111.
When the liquid enters the inner pipeline from the inlet at the upper end of the connecting pipe 11, passes through the inner pipeline and flows out from the liquid outlet 112 of the connecting pipe, enters the liquid inlet of the inner sleeve of the rotary sleeve 12, is collected in the inner cavity 120, and finally forms three liquid streams 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
Embodiment 2 provides a negative pressure sand washing device which is operated on a deep water well to be repaired, comprising a washing head 1 of embodiment 1, and the structure thereof is described in detail below.
Referring to fig. 7, the negative pressure sand washing device further comprises a tube core assembly 2 and a sleeve assembly 3,
referring to fig. 8, the die assembly 2 includes an upper double-wall oil pipe 21, a negative pressure generator 24, a sealing shunt 25 and a lower double-wall oil pipe 22 which are disposed in this order from top to bottom,
the upper double-wall oil pipe 21 and the lower double-wall oil pipe 22 are both of a double-layer pipe structure formed by sleeving an inner oil pipe 201 on an outer oil pipe 202;
the gas-liquid mixer 23 is arranged in the outer oil pipe 202 of the upper double-wall oil pipe 21, and a liquid inlet of the gas-liquid mixer 23 is in butt joint with the inner oil pipe 201 of the upper double-wall oil pipe 21;
specifically, a uniflow 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 a spray head, and the spray head and an outer oil pipe 202 of the upper double-wall oil pipe 21 jointly enclose a spray zone 200;
referring to fig. 9, the negative pressure generator 24 has an inner tube and an outer tube, and a first cross-flow 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 crossover 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 sparging zone 200 for receiving fluid from the sparging zone 200.
The sealing shunt 25 is a double-layer tube structure having an inner tube and an outer tube. The bottom end of the inner layer pipe of the negative pressure generator 24 is communicated with the inner layer pipe of the sealing shunt 25, and the outer layer pipe of the negative pressure generator 24 is communicated with the outer layer pipe of the sealing shunt 25;
the junction of the outer tube of the negative pressure generator 24 and the outer tube of the sealing shunt 25 is provided with a second cross flow port 250 for fluid to flow between the inside and the outside of the outer tube of the sealing shunt 25, wherein the second cross flow port 250 is located below the first cross flow port 240, as shown in fig. 8;
the top end of the inner oil pipe 201 and the top end of the outer oil pipe 202 of the lower double-wall oil pipe 22 are respectively butted with the bottom end of the inner layer pipe and the bottom end of the outer layer pipe of the sealing diverter 25;
the flushing head 1 is disposed at the bottom end of the inner oil pipe 201 of the lower double-wall oil pipe 22, and the inlet of the abutting portion 110 of the connection pipe 11 communicates with the inner oil pipe 201 of the lower double-wall oil pipe 22.
Referring to fig. 10, the casing assembly 3 includes a production tubing 31, a production casing 32, a screen 33 and a plurality of packers 35, wherein the bottom of the deep well to be repaired has settled sand 34.
Referring to fig. 7, the screen 33 is extended downward to deposit sand 34, the production casing 32 is butted 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 die assembly 2 is disposed inside the production tubing 31 with the rinse head 1 directly above the deposited sand 34.
Example 3: application method of negative pressure sand washing pipe column device
Embodiment 3 provides a method for using the negative pressure sand washing pipe column device provided in embodiment 2, working in a deep water well to be repaired, referring to fig. 11 and 12, the method comprises the following steps:
step S1: determining a deep water well to be repaired, and sequentially putting a screen pipe 33, a production sleeve 32 and a production oil pipe 31 into the deep water well to be repaired to form a sleeve assembly 3;
wherein, the bottom of the deep well to be repaired is provided with deposited sand 34, the screen pipe 33 extends downwards into the deposited sand 34, the production casing 32 is in butt joint with the screen pipe 33, the production oil pipe 31 is arranged in the production casing 32, and a plurality of packers 35 are arranged between the production casing 32 and the production oil pipe 31 at intervals;
step S2: lowering the pipe core assembly 2 into the production oil pipe 31, positioning the flushing head 1 right above the deposited sand 34, and keeping the height of the upper double-wall oil pipe 21 at the wellhead position of the deep water well to be repaired;
wherein the length of the lower double-wall tubing 22 is greater than the length of the screen 33, and the sealing shunt 25 is sealed inside the production tubing 31;
step S3: the sand detection surface specifically comprises the following steps:
continuing to lower the tube core assembly 2, detecting the sand surface of the deposited sand 34 by using the flushing head 1, and determining the sand surface position of the deposited sand 34;
lifting the tube 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, the 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 lowering the sand washing liquid into the pipe core assembly 2;
the sand washing liquid flows through the annulus between the outer oil pipe 202 of the upper double-wall oil pipe 21 and the production oil pipe 31, falls down to the sealing shunt 25 and gathers, and flows into the inner layer pipe of the sealing shunt 25 from the outer layer pipe of the sealing shunt 25 through the second cross flow port 250;
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 flushing head 1, the sand washing liquid enters an inner pipeline from an inlet at the upper end of the connecting pipe 11, flows out from a connecting pipe liquid outlet 112 after passing through the inner pipeline, enters a liquid inlet of an inner sleeve of the rotary sleeve 12, is gathered in the inner cavity 120, and is respectively sprayed outwards in three liquid streams from nozzles 13 at two ends of the rotary sleeve 12 and a liquid spraying port 121 in the middle of the rotary sleeve 12; the spray nozzle 13 positioned in front sprays sand washing liquid obliquely forwards, the sand washing liquid impacts the bottom of the well to be repaired and the deposited sand 34 on the wall of the screen pipe 33, the spray nozzle 13 positioned behind sprays sand washing liquid obliquely backwards, the sand washing liquid washes the wall of the screen pipe 33 of the well to be repaired upwards, the spray nozzle 121 in the middle of the rotary pipe sleeve 12 sprays sand washing liquid along the radial tangential direction of the rotary pipe sleeve 12, the sand washing liquid impacts the wall of the screen pipe 33 of the well to be repaired, and simultaneously, rotational force is generated to promote the rotary pipe sleeve 12 to perform circumferential rotary motion;
the sand washing liquid gathers more and more at the bottom of the deep water well to be repaired to form sand returning liquid;
the sand returning liquid enters the lower double-wall oil pipe 22 upwards through the annulus between the outer oil pipe 202 and the inner oil pipe 201 of the lower double-wall oil pipe 22, rises to the negative pressure generator 24, and flows into the inner layer pipe of the negative pressure generator 24 from the outer layer pipe of the negative pressure generator 24 through the first cross flow port 240;
the other part of 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 sand returning liquid above the negative pressure generator 24, and continuously upwards flows to the air injection area 200;
the gas injection sand return comprises the following steps:
high-pressure gas is injected into the inner oil pipe 201 of the upper double-wall oil pipe 21, the high-pressure gas passes through the gas-liquid mixer 23, is sprayed out from a spray head of the gas-liquid mixer 23 and enters the gas spraying area 200, is mixed with sand returning liquid in the gas spraying area 200, and continuously flows upwards to the wellhead of the deep well to be repaired, so that the whole process of negative-pressure sand flushing and well flushing is completed.
Step S5: after flushing the deposited sand 34 at the bottom of the deep well to be repaired, the die assembly 2 is retracted.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (7)
1. A negative pressure sand washing device is operated on a deep water well to be repaired, and comprises a washing head, wherein the washing head comprises a connecting pipe (11), a rotary pipe sleeve (12), a plurality of nozzles (13) and a guide head (15),
the connecting pipe (11) comprises a butt joint part (110) and a liquid spraying part (111) which are integrally formed, the upper end and the lower end of an inner pipeline of the butt joint part (110) are large, the lower end of the inner pipeline is small, a plurality of connecting pipe liquid outlets (112) are formed in the pipe wall of the liquid spraying part (111) of the connecting pipe (11), and the inner 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; the annular space between the outer rotating tube and the inner sleeve forms an inner cavity (120);
sealing strips (14) are arranged at the two ends between the rotary pipe sleeve (12) and the connecting pipe (11) in a sealing way; the transition area of the butt joint part (110) and the liquid spraying part (111) is provided with a first step (114), a second step (115) is formed at the bayonet (113) of the liquid spraying part (111), two sealing strips (14) are respectively sleeved on the outer walls of the liquid spraying part (111) of the first step (114) and the second step (115), and the rotary sleeve (12) is sleeved on the pipe wall of the liquid spraying part (111); four nozzles (13) are obliquely arranged at two ends of the rotary pipe sleeve (12), a plurality of liquid spraying ports (121) are vertically arranged in the middle of an outer rotary pipe of the rotary pipe sleeve (12), a plurality of liquid inlets are formed in an inner sleeve of the rotary pipe sleeve (12), the liquid inlets of the inner sleeve of the rotary pipe sleeve (12) are 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);
the inner sleeve of the rotary pipe sleeve (12) is sleeved on the connecting pipe (11), and liquid inlets on the inner sleeve of the rotary pipe sleeve (12) are correspondingly communicated with the liquid outlets (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, a bayonet (113) is arranged at the bottom end of the liquid spraying part (111) of the connecting pipe (11), and the upper end of the guide head (15) is buckled on the bayonet (113) of the liquid spraying part (111);
characterized in that the device also comprises a tube core component (2) and a sleeve component (3)
The tube core assembly (2) comprises an upper double-wall oil tube (21), a negative pressure generator (24), a sealing shunt (25) and a lower double-wall oil tube (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 of 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 in the 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 oil pipe (31), a production casing (32), a screen pipe (33) and a plurality of packers (35), wherein sediment sand (34) is arranged at the bottom of a deep well to be repaired, the screen pipe (33) extends downwards to the sediment sand (34), the production casing (32) is in butt joint with the screen pipe (33), the production oil pipe (31) is arranged in the production casing (32), and the production casing (32) and the production oil pipe (31) are separated by a plurality of packers (35) at intervals;
the tube core assembly (2) is arranged inside the production oil tube (31), and the flushing head (1) is positioned right above the deposited sand (34).
2. The negative pressure sand washing device as claimed in claim 1, wherein,
the liquid inlet of the gas-liquid mixer (23) is in butt joint with the 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 a spray head, and the spray head and an outer oil pipe (202) of the upper double-wall oil pipe (21) jointly enclose a spray zone (200);
the negative pressure generator (24) is provided with an inner layer pipe and an outer layer pipe, and a first cross flow port (240) is arranged between the inner layer pipe and the outer layer pipe of the negative pressure generator (24) and is used for enabling 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 fluid of the air injection area (200);
the sealing shunt (25) has 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 sealing shunt (25), and the outer layer pipe of the negative pressure generator (24) is communicated with the outer layer pipe of the sealing shunt (25);
a second cross flow 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 sealing shunt (25) and is used for enabling fluid to flow between the inner side and the outer side of the outer layer pipe of the sealing shunt (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 in butt joint with the bottom end of an inner layer pipe and the bottom end of an outer layer pipe of the sealing shunt (25).
3. The negative pressure sand washing device according to claim 2, characterized in that the first cross-flow port (240) is located above the negative pressure generator (24); the second cross flow port (250) is positioned below the first cross flow port (240).
4. A method of using the negative pressure sand washing apparatus as claimed in any one of claims 1 to 3 for operating in deep water wells to be repaired, comprising
Step S1: determining a deep water well to be repaired, and sequentially putting a screen pipe (33), a production sleeve (32) and a production oil pipe (31) into the deep water well to be repaired to form a sleeve assembly (3);
step S2: a pipe core assembly (2) is put into a production oil pipe (31), the flushing head (1) is positioned right above the deposited sand (34), and the height of the upper double-wall oil pipe (21) is kept at the wellhead position of the deep water well to be repaired;
step S3: continuing to lower the tube core assembly (2), and detecting the sand surface of the deposited sand (34) by using the flushing head (1) to determine the sand surface position of the deposited sand (34); lifting the tube 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
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 lowering the sand washing liquid into the pipe core assembly (2);
the sand washing liquid flows through the annulus of the outer oil pipe (202) and the production oil pipe (31) of the upper double-wall oil pipe (21), falls down to the sealing shunt (25) and gathers, and flows into the inner layer pipe of the sealing shunt (25) from the outer layer pipe of the sealing shunt (25) through the second cross flow port (250);
part of sand washing liquid passes through an inner oil pipe (201) of the lower double-wall oil pipe (22) downwards and directly enters the flushing head (1), and the sand washing liquid is sprayed outwards from the flushing head (1) liquid; the sand washing liquid gathers more and more at the bottom of the deep water well to be repaired to form sand returning liquid; the sand returning liquid enters the lower double-wall oil pipe (22) upwards through an annulus 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 cross flow port (240);
the other part of sand washing liquid upwards enters the negative pressure generator (24), is mixed with sand returning liquid above the negative pressure generator (24) after being sprayed out at a high speed by the negative pressure generator (24), and continuously flows upwards to the air injection area (200);
step S5: and after the deposited sand (34) at the bottom of the deep water well to be repaired is washed out, the tube core assembly (2) is collected.
5. The method of claim 4, wherein,
the negative pressure sand washing is carried out, and meanwhile, the negative pressure sand washing device also comprises gas injection sand return, and 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),
the high-pressure gas is sprayed out of a spray head of the gas-liquid mixer (23) through the gas-liquid mixer (23) and enters the gas spraying area (200), and is mixed with sand returning liquid in the gas spraying area (200) to continuously flow upwards to the wellhead of the deep water well to be repaired, so that the whole process of negative-pressure sand flushing and well flushing is completed.
6. The method of claim 4, wherein,
in the process of outward spraying of the sand washing liquid from the flushing head (1), the sand washing liquid directly enters the flushing head (1) downwards after passing through an inner oil pipe (201) of a lower double-wall oil pipe (22), enters an inner pipeline from an inlet at the upper end of a connecting pipe (11), flows out from a connecting pipe liquid outlet (112) after passing through the inner pipeline, enters an inner liquid inlet of a rotary pipe sleeve (12), is converged in an inner cavity (120), and is respectively sprayed outwards from three liquid flows from nozzles (13) at two ends of the rotary pipe sleeve (12) and a liquid spraying port (121) in the middle of the rotary pipe sleeve (12).
7. The method of claim 6, wherein,
the spray nozzles (13) at two ends of the rotary pipe sleeve (12) and the spray nozzle (121) in the middle of the rotary pipe sleeve (12) are divided into three liquid flows to spray outwards, and the spray nozzle comprises:
the nozzle (13) positioned in front sprays sand washing liquid obliquely forwards, and the sand washing liquid impacts deposited sand (34) at the bottom of a deep well to be repaired and on the wall of the screen pipe (33);
the nozzle (13) positioned at the rear is obliquely and then sprayed with sand washing liquid, and the sand washing liquid washes the pipe wall of the screen pipe (33) of the deep well to be repaired upwards;
the spray nozzle (121) in the middle of the rotary pipe sleeve (12) sprays sand washing liquid along the radial tangential 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, rotary force is generated to drive the rotary pipe sleeve (12) to perform circular rotary motion.
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