CN110259422B - Double-pipe separate injection operation device and method under pressure - Google Patents
Double-pipe separate injection operation device and method under pressure Download PDFInfo
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- CN110259422B CN110259422B CN201910602452.XA CN201910602452A CN110259422B CN 110259422 B CN110259422 B CN 110259422B CN 201910602452 A CN201910602452 A CN 201910602452A CN 110259422 B CN110259422 B CN 110259422B
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- piston
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- 238000002347 injection Methods 0.000 title claims abstract description 57
- 239000007924 injection Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 119
- 238000011001 backwashing Methods 0.000 claims abstract description 30
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 16
- 230000037431 insertion Effects 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002627 tracheal intubation Methods 0.000 claims 6
- 238000002955 isolation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention provides a double-pipe separate injection pressurized operation device and a method. The cannula comprises a cannula main body, a cannula piston and a telescopic cylinder connector, wherein the lower end of the cannula main body is connected with the telescopic cylinder connector, and the piston is positioned in the cannula main body. The sealing assembly consists of a sealing cylinder and a telescopic cylinder, wherein the telescopic cylinder is inserted into the sealing cylinder and is fixedly connected through a shear pin. The sealing cylinder comprises an upper joint, a cannula sealing ring, a compression ring, a telescopic cylinder sealing ring, a backwashing sleeve and a pin seat; the cannula sealing ring is arranged in a sealing ring groove of the upper connector, the telescopic cylinder sealing ring is embedded into the pressing ring, the upper connector is connected with the pressing ring, the lower end of the pressing ring is connected with the backwashing sleeve, and the backwashing sleeve is connected with the pin seat through threads. The invention can solve the problems that the common sealing tool cannot be automatically closed to isolate the pressure of the sleeve after the sleeve is lifted out, and the double-pipe separate injection operation with pressure cannot be realized.
Description
Technical Field
The invention relates to the technical field of oilfield oil extraction, in particular to a double-pipe separate injection operation device and method under pressure.
Background
With the deep development of oilfield water injection, in order to master the production condition of each water injection interval in real time, the basic conditions such as the temperature, the pressure and the like of an oil reservoir are known, and the research of a double-pipe separate injection technology is developed. At present, there is no cannula and sealing assembly suitable for double-tube separate injection operation under pressure in the market, so that the product is urgently needed to fill the market gap so as to meet the requirement of fine water injection.
Disclosure of Invention
In order to solve the problem that a cannula and a sealing assembly suitable for double-tube separate injection pressurized operation are not available in the market at present, the invention provides a double-tube separate injection pressurized operation device and a method, which can be put into a well together with a water injection tubular column in a pressurized environment to isolate high-pressure water in the cannula from entering the cannula through the sealing assembly; when the pipe column is required to be lifted up under pressure, the injection is stopped firstly, the insertion pipe is lifted up and the telescopic cylinder is driven to close the water outlet of the sealing assembly, high pressure in the isolation sleeve pipe is transmitted into the sealing assembly, and the operation requirement of double-pipe separate injection on the pressure of the inner pipe and the pressure of the outer pipe is met.
The invention adopts the technical scheme that:
the double-tube separate injection pressurized operation device at least comprises a cannula and a sealing assembly, wherein one end of the cannula is positioned in the sealing assembly.
The cannula comprises a cannula main body, a cannula piston and a telescopic cylinder connector, wherein the lower end of the cannula main body is connected with the telescopic cylinder connector, and the piston is positioned in the cannula main body.
The sealing assembly consists of a sealing cylinder and a telescopic cylinder, wherein the telescopic cylinder is inserted into the sealing cylinder and is fixedly connected through a shear pin.
The sealing cylinder comprises an upper joint, a cannula sealing ring, a compression ring, a telescopic cylinder sealing ring, a backwashing sleeve and a pin seat; the pipe inserting sealing ring is arranged in a sealing ring groove of the upper connector, the telescopic cylinder sealing ring is embedded into the pressing ring, the upper connector is connected with the pressing ring, the lower end of the pressing ring is connected with the backwashing sleeve, the backwashing sleeve is connected with the pin seat through threads, and the backwashing sleeve is provided with a backwashing sleeve water outlet.
The telescopic cylinder at least comprises a cannula positioning ring, a C-shaped steel ring, a baffle ring, a supporting tube, a uniflow piston seat, a telescopic cylinder piston, a spring and a spring seat; the pipe inserting locating ring is connected with the baffle ring, the C-shaped steel ring is located between the baffle ring and the pipe inserting locating ring, the lower end of the baffle ring is connected with the supporting pipe and the single-flow piston seat in sequence, the spring seat is connected with the single-flow piston seat through threads, one end of the spring is connected with the spring seat, the other end of the spring is connected with the telescopic cylinder piston, and the telescopic cylinder piston and the spring are located in the single-flow piston seat.
The upper joint is fixedly connected with the compression ring through screw threads.
The lower end of the compression ring is connected with the backwashing sleeve through screw threads.
A double-pipe separate injection operation method with pressure comprises the following specific steps:
firstly, respectively assembling a cannula and a sealing assembly; then the sealing assembly is pressed down into the water injection well along with the outer oil pipe; the inner-layer oil pipe is connected with the insertion pipe to be lowered to the position of the insertion pipe locating ring of the sealing assembly, the length of the oil pipe in the wellhead accessory is adjusted, the insertion pipe pushes away the telescopic cylinder of the sealing assembly through lowering the weight of the wellhead and the pipe column, at the moment, the insertion pipe water outlet is communicated with the backwash sleeve water outlet, then the water injection wellhead is fixed through bolts, the piston pin in the insertion pipe is sheared by pressing from the inner pipe, the insertion pipe piston falls to expose the insertion pipe water injection port, and normal water injection from the inner pipe can be performed; when the pipe column needs to be lifted by pressure, firstly stopping pouring and discharging the four-way bolt at the upper wellhead, then slowly lifting the wellhead and the inner oil pipe together, enabling the telescopic tube connector of the insertion tube to be matched with the C-shaped steel ring of the sealing assembly, driving the telescopic tube of the sealing assembly to ascend to close the sealing assembly, isolating the pressure of the sleeve outside the sealing assembly, and lifting the inner pipe at normal pressure; the outer tube is lifted and lowered, and a pressurized operation machine is needed, so that the pressurized operation of double-tube separate injection is realized.
The invention has the beneficial effects that:
the invention relates to a double-tube dispensing pressurized operation device, which provides a cannula and sealing assembly. The cannula and the sealing assembly can solve the problems that after the cannula is lifted by a common sealing tool, the cannula cannot be automatically closed and the pressure of the cannula is isolated, and the double-tube separate injection operation with pressure cannot be realized.
Further description will be made below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic illustration of the cannula principle of the double-tube dispensing pressurized operation of the present invention.
Fig. 3 is a schematic diagram of a sealing assembly for double-tube dispensing pressurized operation according to the present invention.
In the drawings, reference numerals are: 1. an upper joint; 2. a cannula sealing ring; 3. a compression ring; 4. a telescopic cylinder sealing ring; 5. a cannula positioning ring; 6. c-shaped steel ring; 7. a water outlet; 8. a baffle ring; 9. a support tube; 10. backwashing the sleeve; 11. a pin seat; 12. shearing nails; 13. a uniflow piston seat; 14. a telescopic cylinder piston; 15. a spring; 16. a spring seat; 17. a cannula; 1701. a cannula body; 1702. a cannula piston; 1703. a telescopic cylinder connector; 18. and (5) a sealing assembly.
Detailed Description
Example 1:
in order to solve the problem that a cannula and a sealing assembly suitable for double-tube separate injection pressurized operation are not available in the market at present, the invention provides a double-tube separate injection pressurized operation device and a method as shown in figures 1-3, which can be put into a well together with a water injection tubular column in a pressurized environment to isolate high-pressure water in a cannula from entering the cannula through the sealing assembly; when the pipe column is required to be lifted up under pressure, the injection is stopped firstly, the insertion pipe is lifted up and the telescopic cylinder is driven to close the water outlet of the sealing assembly, high pressure in the isolation sleeve pipe is transmitted into the sealing assembly, and the operation requirement of double-pipe separate injection on the pressure of the inner pipe and the pressure of the outer pipe is met.
A double-tube dispensing pressurized operation device at least comprises a cannula 17 and a sealing assembly 18, wherein one end of the cannula 17 is positioned in the sealing assembly 18.
The working principle of the invention is as follows: the sealing assembly 18 is pressed into the water injection well along with the outer oil pipe; the pipe inserting 17 is connected with the inner layer oil pipe and falls to the position of the pipe inserting locating ring 5 of the sealing assembly 18, the length of the oil pipe in the wellhead accessory is adjusted, the pipe inserting 17 pushes the telescopic cylinder of the sealing assembly 18 open by lowering the wellhead and the weight of the pipe column, at the moment, the pipe inserting water outlet is communicated with the backwashing sleeve water outlet 7, then the water injection wellhead is fixed by bolts, the piston pin in the pipe inserting 17 is sheared by pressing from the inner pipe, the piston in the pipe inserting 17 falls to expose the pipe inserting water injection port, and normal water injection can be carried out from the inner pipe; when the pipe column needs to be lifted by pressure, firstly stopping the injection and unloading of the bolts of the four-way (inner pipe hanger) at the upper part of the well mouth, then slowly lifting the well mouth and the inner pipe together, enabling the joint of the telescopic tube of the insertion tube to be matched with the C-shaped steel ring of the sealing assembly, driving the telescopic tube of the sealing assembly to ascend to close the sealing assembly, isolating the pressure of the sleeve outside the sealing assembly, and lifting the inner pipe at normal pressure; the outer tube is lifted and lowered, and a pressurized operation machine is needed, so that the pressurized operation of double-tube separate injection is realized.
In order to master the production condition of each water injection interval in real time and know the basic conditions such as the temperature, the pressure and the like of an oil reservoir, a double-pipe separate injection technology research is developed. There is currently no cannula 17 and seal assembly 18 available in the market that is suitable for dual-tube dispensing pressurized operation, and therefore, there is a great need for such products to fill the market gap to meet the need for fine water injection. The present invention provides a cannula 17 and seal assembly 18 that meets the needs. The invention can solve the problems that the common sealing tool cannot be automatically closed to isolate the pressure of the sleeve after the sleeve is lifted out, and the double-pipe separate injection operation with pressure can be realized.
The invention is put into the well together with the water injection pipe column under the environment with pressure, and the high-pressure water in the isolation sleeve pipe enters the insertion pipe 17 through the sealing assembly 18; when the pipe column is required to be lifted up under pressure, the injection is stopped firstly, the insertion pipe 17 is lifted up and the telescopic cylinder is driven, the water outlet of the sealing assembly 18 is closed, high pressure in the isolation sleeve pipe is transmitted into the sealing assembly 18, and the requirement of double-pipe separate injection on the operation under pressure of the normal pressure of the inner pipe and the pressure of the outer pipe is met.
Example 2:
based on the embodiment 1, in this embodiment, the cannula 17 includes a cannula body 1701, a cannula plunger 1702 and a telescopic tube connector 1703, wherein the lower end of the cannula body 1701 is connected to the telescopic tube connector 1703, and the plunger 1702 is located in the cannula body 1701.
In the present invention, cannula 17 is comprised of at least cannula body 1701, cannula plunger 1702 and telescoping connector 1703. The upper portion of cannula body 1701 is threaded for connection to tubing, the middle portion has a water outlet and a pin hole for securing cannula plunger 1702, and the lower portion is threaded for connection to telescoping tube connector 1703. The upper part of the cannula piston 1702 is provided with two sealing rings, the middle part is provided with a conical surface which can be matched with the conical surface protruding from the inside of the cannula main body 1701, and the lower part is provided with a positioning hole, so that the cannula piston 1702 can be fixed in the cannula main body 1701 through a pin. The telescoping tube connector 1703 is threadably connected to the cannula body 1701 with a recess in the middle for connection to a telescoping tube of the seal assembly 18 and a tapered guide design in the lower portion.
The sealing assembly 18 consists of a sealing cylinder and a telescopic cylinder, wherein the telescopic cylinder is inserted into the sealing cylinder and is fixedly connected through a shear pin.
The sealing cylinder comprises an upper joint 1, a cannula sealing ring 2, a compression ring 3, a telescopic cylinder sealing ring 4, a backwashing sleeve 10 and a pin seat 11; the pipe inserting sealing ring 2 is arranged in a sealing ring groove of the upper joint 1, the telescopic cylinder sealing ring 4 is embedded in the pressing ring 3, the upper joint 1 is connected with the pressing ring 3, the lower end of the pressing ring 3 is connected with the backwashing sleeve 10, the backwashing sleeve 10 is connected with the pin seat 11 through threads, and the backwashing sleeve 10 is provided with the backwashing sleeve water outlet 7.
In the invention, the assembly process of the sealing cylinder is as follows: firstly, the cannula sealing ring 2 is arranged in a sealing ring groove of the upper joint 1, the telescopic cylinder sealing ring 4 is embedded in the compression ring 3, then the upper joint 1 is connected and fastened with the compression ring 3 through screw threads, the lower end of the compression ring 3 is connected and fastened with the backwashing sleeve 10 through screw threads, and finally the pin seat 11 is connected with the backwashing sleeve 10 through screw threads.
The telescopic cylinder at least comprises a cannula positioning ring 5, a C-shaped steel ring 6, a baffle ring 8, a supporting tube 9, a single-flow piston seat 13, a telescopic cylinder piston 14, a spring 15 and a spring seat 16; the cannula locating ring 5 is connected with the baffle ring 8, the C-shaped steel ring 6 is located between the baffle ring 8 and the cannula locating ring 5, the lower end of the baffle ring 8 is sequentially connected with the supporting tube 9 and the single-flow piston seat 13, the spring seat 16 is connected with the single-flow piston seat 13 through threads, one end of the spring 15 is connected with the spring seat 16, the other end of the spring 15 is connected with the telescopic cylinder piston 14, and the telescopic cylinder piston 14 and the spring 15 are both located in the single-flow piston seat 13.
The assembly process of the telescopic cylinder in the invention is as follows: firstly, the C-shaped steel ring 6 is placed in the baffle ring 8, the baffle ring 8 is connected with the baffle ring 8 through the threads of the cannula positioning ring 5, the baffle ring 8 is sequentially connected with the support tube 9 and the uniflow piston seat 13 through threads, finally, the telescopic cylinder piston 14 and the spring 15 are sequentially plugged into the uniflow piston seat 13, and the spring seat 16 is connected with the uniflow piston seat 13 through threads.
The upper joint 1 and the compression ring 3 are connected and fastened through screw threads.
The lower end of the compression ring 3 is connected with the backwashing sleeve 10 through screw threads.
In the invention, the assembly process of the sealing assembly is as follows: the pin seat 11 of the sealing cylinder is firstly disassembled, then the telescopic cylinder is inserted into the sealing cylinder, the pin seat 11 of the sealing cylinder is then assembled back and screwed, and finally the sealing cylinder and the telescopic cylinder are fixed through the shear pins, so that the assembly of the sealing assembly is completed.
A double-pipe separate injection operation method with pressure comprises the following specific steps:
first, the cannula 17 and the seal assembly 18 are assembled separately; then the sealing assembly 18 is pressed into the water injection well along with the outer oil pipe; the pipe inserting 17 is connected with the inner layer oil pipe and falls to the position of the pipe inserting locating ring 5 of the sealing assembly 18, the length of the oil pipe in the wellhead accessory is adjusted, the pipe inserting 17 pushes the telescopic cylinder of the sealing assembly 18 open by lowering the weight of the wellhead and the pipe column, at the moment, the pipe inserting water outlet is communicated with the backwashing sleeve water outlet 7, then the water injection wellhead is fixed by bolts, the piston pin in the pipe inserting 17 is sheared by pressing from the inner pipe, the pipe inserting piston 1702 falls to expose the pipe inserting water injection port, and normal water injection can be carried out from the inner pipe; when the pipe column needs to be lifted up with pressure, firstly stopping filling and discharging the four-way bolt at the upper wellhead, then slowly lifting the wellhead and the inner oil pipe together, enabling the telescopic tube connector 1703 of the insertion tube 17 to be matched with the C-shaped steel ring 6 of the sealing assembly 18, driving the telescopic tube of the sealing assembly 18 to ascend to close the sealing assembly 18, isolating the pressure of the sleeve outside the sealing assembly 18, and lifting the inner pipe at normal pressure; the outer tube is lifted and lowered, and a pressurized operation machine is needed, so that the pressurized operation of double-tube separate injection is realized.
As shown in fig. 2, the cannula 17 is assembled by:
first, as shown in fig. 2, the sealing ring of the cannula piston 1702 is first installed in the sealing ring groove of the piston 1702.
In a second step, cannula plunger 1702 is placed into abutment within the water injection passageway of cannula body 1701.
Third, the pins are installed from the pin holes of cannula body 1701 to secure plunger 1702.
Fourth, the telescopic tube connector 1703 is screwed to the cannula body 1701, which completes the assembly of the cannula 17.
As shown in fig. 3, the assembly process of the seal assembly 18 is:
first, as shown in fig. 3, the cannula seal ring 2 is first installed in the seal groove of the upper joint 1.
And secondly, placing the telescopic cylinder sealing ring 4 into the compression ring 3 and propping against the compression ring.
And thirdly, connecting the upper joint 1 with the compression ring 3 through threads.
And fourthly, the backwashing sleeve 10 and the compression ring 3 are connected through threads, and the assembled sealing cylinder (only the differential pin seat 11) is placed for standby.
And fifthly, placing the C-shaped steel ring 6 into the baffle ring 8.
And sixthly, fixing the cannula positioning ring 5 and the baffle ring 8 through threads, and ensuring that the steel ring can slightly move in the cannula positioning ring.
And seventh, fixing the baffle ring 8 and the support tube 9 through threads.
And eighth step, the supporting tube 9 and the uniflow piston seat 13 are fixed by threads.
And ninth, sequentially plugging the piston 14 and the spring 15 into the single-flow piston seat 13.
Tenth, the spring seat 16 is tightly pressed against the piston 14 in the single-flow piston seat 13 through the spring 15, and the spring seat 16 is tightly connected with the single-flow piston seat 13 through screw threads, so that the telescopic cylinder is assembled.
And eleventh, putting the telescopic cylinder assembled in the tenth step into the sealing cylinder (only the differential pin seat 11) assembled in the fourth step.
And twelfth, the pin seat 11 is sleeved at the lower end of the telescopic cylinder in the eleventh step and is tightly connected with the backwashing sleeve 10 through threads.
Thirteenth, the shear pin 12 is inserted into the pin slot of the support tube 9 through the hole on the pin seat 11, and the telescopic cylinder is fixed, thus completing the whole assembly of the sealing assembly 18.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention. The apparatus structure and method steps not described in detail in this embodiment are well known and commonly used in the industry and will not be described in detail herein.
Claims (5)
1. A double-pipe separate injection operation method with pressure is characterized in that: the double-pipe separate injection pressurized operation device is adopted and at least comprises a cannula (17) and a sealing assembly (18), wherein one end of the cannula (17) is positioned in the sealing assembly (18); the intubation tube (17) comprises an intubation main body (1701), an intubation piston (1702) and a telescopic tube connector (1703), wherein the lower end of the intubation main body (1701) is connected with the telescopic tube connector (1703), and the intubation piston (1702) is positioned in the intubation main body (1701); the sealing assembly (18) consists of a sealing cylinder and a telescopic cylinder, and the telescopic cylinder is inserted into the sealing cylinder and is fixedly connected through a shear pin; the sealing cylinder comprises an upper joint (1), a cannula sealing ring (2), a compression ring (3), a telescopic cylinder sealing ring (4), a backwashing sleeve (10) and a pin seat (11); the pipe inserting sealing ring (2) is arranged in a sealing ring groove of the upper joint (1), the telescopic cylinder sealing ring (4) is embedded into the pressing ring (3), the upper joint (1) is connected with the pressing ring (3), the lower end of the pressing ring (3) is connected with the backwashing sleeve (10), the backwashing sleeve (10) is connected with the pin seat (11) through threads, and the backwashing sleeve (10) is provided with the backwashing sleeve water outlet (7); the telescopic cylinder at least comprises an insertion pipe positioning ring (5), a C-shaped steel ring (6), a baffle ring (8), a supporting pipe (9), a single-flow piston seat (13), a telescopic cylinder piston (14), a spring (15) and a spring seat (16); the device is characterized in that the cannula positioning ring (5) is connected with the baffle ring (8), the C-shaped steel ring (6) is positioned between the baffle ring (8) and the cannula positioning ring (5), the lower end of the baffle ring (8) is sequentially connected with the support tube (9) and the uniflow piston seat (13), the spring seat (16) is connected with the uniflow piston seat (13) through threads, one end of the spring (15) is connected with the spring seat (16), the other end of the spring is connected with the telescopic cylinder piston (14), and the telescopic cylinder piston (14) and the spring (15) are both positioned in the uniflow piston seat (13);
the double-pipe separate injection operation method comprises the following specific steps:
firstly, respectively assembling a cannula (17) and a sealing assembly (18); then the sealing assembly (18) is pressed into the water injection well along with the outer oil pipe; the pipe inserting (17) is connected with the inner layer oil pipe and falls to the position of the pipe inserting positioning ring (5) of the sealing assembly (18), the length of the oil pipe in the wellhead accessory is adjusted, the pipe inserting (17) pushes away the telescopic cylinder of the sealing assembly (18) through the weight of the well head and the pipe column, at the moment, the pipe inserting water outlet is communicated with the backwash sleeve water outlet (7), the water injection wellhead is fixed through a bolt, the piston pin in the pipe inserting (17) is sheared by pressing from the inner pipe, the pipe inserting piston (1702) falls to expose the pipe inserting water injection port, and then normal water injection can be carried out from the inner pipe; when the pipe column is required to be lifted by pressure, firstly stopping filling and discharging the four-way bolt at the upper wellhead, then slowly lifting the wellhead and the inner-layer oil pipe together, enabling the telescopic cylinder connector (1703) of the insertion pipe (17) to be matched with the C-shaped steel ring (6) of the sealing assembly (18), driving the telescopic cylinder of the sealing assembly (18) to ascend to close the sealing assembly (18), isolating the pressure of the sleeve outside the sealing assembly (18), and lifting the inner pipe at normal pressure; the outer tube is lifted and lowered, and a pressurized operation machine is needed, so that the pressurized operation of double-tube separate injection is realized.
2. The double-pipe dispensing pressurized operation method according to claim 1, wherein: the upper joint (1) is connected and fastened with the compression ring (3) through threads.
3. The double-pipe dispensing pressurized operation method according to claim 1, wherein: the lower end of the compression ring (3) is connected with the backwashing sleeve (10) through screw threads.
4. The double-pipe dispensing pressurized operation method according to claim 1, wherein: the assembling process of the cannula (17) is as follows:
firstly, installing a sealing ring of a cannula piston (1702) in a sealing ring groove of the cannula piston (1702);
secondly, placing the cannula piston (1702) into a water injection channel of the cannula main body (1701) to be tightly abutted;
thirdly, installing a pin from a pin hole of the cannula main body (1701) to fix the cannula piston (1702);
and fourthly, the telescopic tube connector (1703) is connected with the cannula main body (1701) through threads, and the assembly of the cannula (17) is completed.
5. The double-pipe dispensing pressurized operation method according to claim 1, wherein: the assembly process of the sealing assembly (18) is as follows:
firstly, installing a cannula sealing ring (2) in a sealing ring groove of an upper joint (1);
secondly, placing the telescopic cylinder sealing ring (4) into the compression ring (3) and propping against the compression ring;
thirdly, the upper joint (1) and the compression ring (3) are connected through threads;
fourthly, the backwashing sleeve (10) is connected with the compression ring (3) through threads, and the assembled sealing cylinder is placed for standby;
fifthly, placing the C-shaped steel ring (6) into the baffle ring (8);
sixthly, fixing the cannula positioning ring (5) and the baffle ring (8) through threads, and ensuring that the steel ring can slightly move in the cannula positioning ring;
seventh, fixing the baffle ring (8) and the support tube (9) through threads;
eighth, the supporting tube (9) and the uniflow piston seat (13) are fixed through threads;
ninth, sequentially plugging the telescopic cylinder piston (14) and the spring (15) into the uniflow piston seat (13);
tenth, the spring seat (16) is tightly abutted against the telescopic cylinder piston (14) in the single-flow piston seat (13) through the spring (15), and the spring seat (16) is tightly connected with the single-flow piston seat (13) through a screw thread, so that the telescopic cylinder is assembled;
eleventh, putting the telescopic cylinder assembled in the tenth step into the sealing cylinder assembled in the fourth step;
a twelfth step, sleeving a pin seat (11) at the lower end of the telescopic cylinder in the eleventh step, and tightly connecting the pin seat with a backwashing sleeve (10) through threads;
and thirteenth step, the shear pin (12) passes through the hole on the pin seat (11) and is embedded into the pin groove of the supporting tube (9), and the telescopic tube is fixed, so that the whole assembly of the sealing assembly (18) is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910602452.XA CN110259422B (en) | 2019-07-05 | 2019-07-05 | Double-pipe separate injection operation device and method under pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910602452.XA CN110259422B (en) | 2019-07-05 | 2019-07-05 | Double-pipe separate injection operation device and method under pressure |
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| CN110259422A CN110259422A (en) | 2019-09-20 |
| CN110259422B true CN110259422B (en) | 2023-11-28 |
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