CN110485968B - One-stage two-section eccentric acid injection integrated tubular column - Google Patents
One-stage two-section eccentric acid injection integrated tubular column Download PDFInfo
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- CN110485968B CN110485968B CN201910870058.4A CN201910870058A CN110485968B CN 110485968 B CN110485968 B CN 110485968B CN 201910870058 A CN201910870058 A CN 201910870058A CN 110485968 B CN110485968 B CN 110485968B
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- 238000002347 injection Methods 0.000 title claims abstract description 101
- 239000007924 injection Substances 0.000 title claims abstract description 101
- 239000002253 acid Substances 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 105
- 238000007789 sealing Methods 0.000 claims abstract description 75
- 230000020477 pH reduction Effects 0.000 claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 230000010354 integration Effects 0.000 claims abstract 2
- 239000007788 liquid Substances 0.000 claims description 59
- 229910000831 Steel Inorganic materials 0.000 claims description 46
- 230000000903 blocking effect Effects 0.000 claims description 46
- 239000010959 steel Substances 0.000 claims description 46
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000005406 washing 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- 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
- 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
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Check Valves (AREA)
Abstract
The invention relates to a one-stage two-section eccentric acid injection integrated pipe column which comprises an upper eccentric water distributor corresponding to an upper water injection layer and a lower eccentric water distributor corresponding to a lower water injection layer, wherein a centralizer and a packer are arranged between the upper eccentric water distributor and the lower eccentric water distributor, a switch valve is arranged above the upper eccentric water distributor, a middle oil pipe is arranged below the lower eccentric water distributor, an acidification check valve is screwed below the middle oil pipe, the lower end of the acidification check valve is screwed with a sieve pipe, an oil pipe fixer is arranged below the sieve pipe, a coating oil pipe is connected below the oil pipe fixer, and a plug is screwed below the coating oil pipe. The middle section of the inner cavity of the lower joint of the acidification check valve is provided with a sliding sleeve ball seat fixed by a shear pin, the upper part of the lower joint is provided with a compression ring fixed by the shear pin, and the top of the compression ring is provided with a sealing ball seat. This sour integration tubular column of annotating only needs to trip one time tubular column, just can realize from the top successive layer acidizing down to do not need to arrange incomplete sour, the acidizing is ended and can directly inject water after the test of dragging for.
Description
Technical Field
The invention relates to a water injection well pipe column, in particular to a first-stage two-section eccentric acid injection integrated pipe column, and belongs to the technical field of water injection well devices.
Background
After the water injection well is developed for a period of time, particularly in the later stage of oil field development, the water injection pressure of most of the water injection wells can be greatly improved, and the water injection well shows the trend of increasing year by year, so that the water injection amount is less and less, the water injection development effect is seriously influenced, and finally the oil field yield is greatly reduced.
The acidification is a blockage removal and injection increase measure frequently adopted for the stratum, and by utilizing the chemical corrosion action of acid liquor and the hydraulic action when acid is squeezed into the stratum, stratum plugs and partial stratum minerals are corroded, stratum slots are enlarged, extended and communicated, or artificial cracks with higher flow conductivity are formed in the stratum, so that the stratum permeability is restored and improved, the resistance of oil gas flowing into the bottom of a well is reduced, the injection capacity of a water injection well is improved, and the aims of increasing the yield of an oil well and increasing the injection of the water well are fulfilled.
In the prior water injection well blockage removal or injection increase construction, separate injection and blockage removal are respectively implemented by two pipe columns, and the operation procedures are generally as follows: lifting a water injection pipe column under the well → treating a shaft → lowering a separate layer plugging removal or injection adding pipe column → plugging removal or injection adding construction → draining liquid → lowering a separate injection pipe column, wherein the separate layer plugging removal or injection adding pipe column generally adopts a mechanical setting or hydraulic setting packer and a matched sieve pipe or a single flow valve sliding sleeve switch.
The traditional acidification blockage removal process mainly has the following problems: the method has the advantages that due to the fact that pressure relief or liquid drainage is carried out after acidification, an oil layer is excited, particles are moved, and accordingly damage is caused to a reservoir layer, and certain risks exist; the long-time flowback treatment is carried out after acidizing and plugging removal, and the well occupying time is long; the construction process is multiple, the period is long, the number of used tools is multiple, and the operation cost is increased; in the pumping and liquid discharging process, in order to prevent the coating of the paint oil pipe below the sieve tube from being damaged, a set of common oil pipe needs to be arranged again for acidizing and liquid discharging construction, and material cost is increased; the acid liquor discharged after the fifth step cannot be discharged on site, and needs to be transported to a specified place by a special vehicle for treatment, so that the subsequent treatment cost is increased.
Under the current situation of low oil price, the research of the layered acidification and layered water injection integrated non-return process is developed, the water drive development effect is improved, the operation cost is reduced, the material cost is saved, the well occupation period is shortened, the oil field development cost is reduced, the oil field development benefit is improved, and the method has important significance in the aspects of energy conservation, environmental protection and the like.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a first-stage two-section eccentric acid injection integrated tubular column, which can realize layer-by-layer acidification from bottom to top only by pulling up the tubular column once, does not need to discharge residual acid, and can directly inject water after the acidification is finished and a throwing and fishing test is carried out.
In order to solve the technical problems, the one-stage two-section eccentric acid injection integrated tubular column comprises an upper eccentric water distributor corresponding to an upper water injection layer and a lower eccentric water distributor corresponding to a lower water injection layer, wherein a centralizer and a packer are arranged between the upper eccentric water distributor and the lower eccentric water distributor, a switch valve is arranged above the upper eccentric water distributor, a middle oil pipe is arranged below the lower eccentric water distributor, an acidification check valve is screwed below the middle oil pipe, a sieve pipe is screwed at the lower end of the acidification check valve, an oil pipe fixer is arranged below the sieve pipe, a coating oil pipe is connected below the oil pipe fixer, and a plug wire is screwed at the lower end of the coating oil pipe.
Compared with the prior art, the invention has the following beneficial effects: the centralizer can enable the pipe column and the packer to be centered, and enables the rubber sleeve to expand more uniformly when the packer is set; the oil pipe fixer is supported on the inner wall of the sleeve pipe to play a role of auxiliary support. The acidizing check valve can be used for positive and negative well flushing before ball injection; an inner sleeve steel ball is put into the acidification check valve, the packer can be set by positive pressurization of a cement truck, and an annulus between an upper water injection layer and a lower water injection layer is separated; and then continuously boosting the pressure to cut off the shear pin, enabling the inner sleeve steel ball and the inner sleeve ball seat to fall into a coating oil pipe below the sieve pipe, and enabling the acid liquid to descend along the inner cavity of the pipe column, enter an annular space from the sieve pipe and then enter a lower water injection layer to acidify the lower water injection layer. After the acid liquor and the displacing liquid in the lower water injection layer are injected, a soluble ball is thrown to seal the central pore passage of the switch valve, the switch valve is opened to the acid liquor passage in the annular space, the acid liquor enters the upper water injection layer, and the upper water injection layer is acidified. After the upper water injection layer and the lower water injection layer are acidified, the soluble ball is dissolved, the central hole channel of the switch valve is communicated, the sealing steel ball is put into the acidified check valve to realize the function of the conventional check valve, and the layered water injection is realized through the upper eccentric water distributor and the lower eccentric water distributor. Only one trip of the pipe column is started, and the layer-by-layer acidification and the separate-layer water injection of two stratums are realized. Because the pipe column does not need to be repeatedly pulled out and put down, the acid liquor overflow can not be caused, and the residual acid ground backflow is not needed. Acid liquor may remain below the screen pipe, so the corrosion resistance is improved by adopting the coated oil pipe.
As an improvement of the invention, the acidizing check valve comprises a check valve upper joint and a check valve lower joint, wherein the internal thread at the lower end of the check valve upper joint is screwed at the upper part of the check valve lower joint, the lower port of the check valve upper joint is abutted against the outer step of the check valve lower joint, the middle section of the inner cavity of the check valve lower joint is provided with an inner sleeve ball seat, the outer step of the inner sleeve ball seat is abutted against the lower part of the inner step of the check valve lower joint, and the circumference below the outer step of the inner sleeve ball seat is uniformly provided with inner sleeve ball seat shear nail holes; at least two inner sleeve shear pins are uniformly screwed on the circumference of the middle section of the lower joint of the check valve, and the inner end of each inner sleeve shear pin is respectively embedded into the corresponding shear pin hole of the inner sleeve ball seat; the upper end of the central hole of the inner sleeve ball seat is provided with a bell mouth for receiving the inner sleeve steel ball; the upper part of the lower joint of the check valve is provided with an inner diameter amplification section and is spliced with a compression ring extending upwards, the circumference of the lower part of the compression ring is symmetrically provided with compression ring shear nail holes, the circumference of the upper part of the lower joint of the check valve is uniformly screwed with at least two compression ring shear nails, the inner end of each compression ring shear nail is respectively embedded into the corresponding compression ring shear nail hole, and the periphery of the upper part of the compression ring is screwed with a ball seat joint; the top of clamping ring is equipped with the sealing ball seat of accepting the sealing steel ball, the top outer fringe of sealing ball seat is pressed the interior step below of ball seat joint, the centre bore diameter of sealing ball seat and clamping ring all is greater than the diameter of endotheca steel ball. And the acidizing check valve can be used for positive and negative well flushing before ball injection. Dropping an inner sleeve steel ball from a well mouth, enabling the inner sleeve steel ball to fall and seat and seal at a bell mouth at the upper end of an inner sleeve ball seat, and positively pressurizing a cement truck to seat and seal a packer in a sleeve so as to separate an annulus of an upper water injection layer and a lower water injection layer; and (4) continuing to pressurize, cutting off the inner sleeve shear pin, enabling the inner sleeve steel ball and the inner sleeve ball seat to descend together and fall into the tail pipe below the sieve pipe, opening a liquid flow channel of the acidification check valve, and carrying out acidification operation on the lower water injection layer. And then putting the soluble ball into the switch valve, setting the soluble ball, and then holding pressure to enable the switch valve sliding sleeve to slide downwards, opening the liquid outlet of the cylinder body, and acidifying the upper water injection layer. And a liquid flow channel of the acidification check valve is used as a pressure transmission channel, so that the sliding sleeve of the switching valve above can be smoothly opened. And after the two water injection layers are acidified, the sealing steel ball is thrown in, falls on the upper port of the sealing ball seat and is set, so that the function of a conventional check valve can be realized, the injected water enters the upper water injection layer from the upper eccentric water distributor and enters the lower water injection layer from the lower eccentric water distributor, and the quantitative injection is realized.
As a further improvement of the invention, the periphery of the upper end of the ball seat joint is symmetrically provided with ball seat joint outer inserting grooves with an opening at the upper end, a key blocking seat is arranged above the ball seat joint, the upper part of the key blocking seat is screwed on the inner wall of the upper part of the check valve upper joint, the circumferential wall of the lower part of the central hole of the key blocking seat is symmetrically provided with a plurality of key blocking embedding grooves, key blocking pin shafts are respectively inserted between two opposite side walls of each key blocking embedding groove, each key blocking pin shaft is respectively sleeved with a rotatable key blocking, the lower end of each key blocking is correspondingly inserted into the corresponding ball seat joint outer inserting groove, the middle part of each key blocking pin shaft is respectively sleeved with a torsion spring, one end of each torsion spring is inserted into the corresponding key blocking, and the other end of each torsion spring is limited below the top wall of the key blocking groove so that the key is subjected to. After the sealing steel ball is seated, the sealing steel ball is used as a conventional check valve of a water injection pipe column, injected water enters the stratum from the eccentric water distributor, a water injection gate is opened to suppress pressure, a compression ring shear pin is cut off, and the ball seat joint, the sealing steel ball and the sealing ball seat descend together with the compression ring until the bottom of the compression ring abuts against an inner step of the lower joint; the ball seat joint outer slot releases the blocking key due to the downward sliding, the blocking key is flat under the action of the tension of the torsion spring, namely the free end of each blocking key vertically points to the axis of the blocking key seat, so that the sealing steel ball is limited between the blocking key and the sealing ball seat, and the sealing steel ball cannot be washed out of the ball seat joint when a well is backwashed.
As a further improvement of the invention, the switch valve comprises a switch valve cylinder, the lower end of the switch valve cylinder is screwed with a lower switch valve connector, the upper port of the switch valve cylinder is provided with a conical female thread, a cylinder first inner step is arranged below the conical female thread, the middle section of the inner cavity of the switch valve cylinder is provided with a switch valve sliding sleeve, the outer wall of the switch valve sliding sleeve is attached to the inner wall of the switch valve cylinder, and the upper end surface of the switch valve sliding sleeve is abutted against the lower part of the cylinder first inner step; the upper end of the central hole of the switch valve sliding sleeve is provided with a switch valve sliding sleeve bell mouth for seating and sealing a soluble ball; a through cylinder liquid outlet is arranged below the first inner step of the cylinder, and the inner port of the cylinder liquid outlet is covered by a switch valve sliding sleeve; and a sliding sleeve resetting mechanism for pushing the switching valve sliding sleeve to move upwards is arranged at the lower end of the switching valve sliding sleeve. After throwing into soluble ball and setting at the last port of ooff valve sliding sleeve, the cement truck is being suppressed, and soluble ball promotes ooff valve sliding sleeve gliding, until the barrel liquid outlet exposes, pours into acidizing fluid into the tubular column through the cement truck this moment, and acidizing fluid flows out from the barrel liquid outlet, gets into upper water injection layer from the annular space of tubular column, carries out the acidizing to upper water injection layer. After the acid solution is fed completely, the displacing liquid is continuously injected, and the inner cavity of the pipe column is ensured to be filled with the displacing liquid; then the cement truck is turned off, the high pressure above the soluble ball disappears, the sliding sleeve resetting mechanism pushes the switch valve sliding sleeve to move upwards to shield the liquid outlet of the barrel body, and the acidification liquid outlet channel is closed. And then closing the well, and performing acidification reaction on the upper water injection layer and the lower water injection layer to dissolve the soluble spheres. The central channel of the switch valve is unblocked again, and the sealing steel ball can smoothly pass through the central channel of the switch valve and fall into the sealing ball seat of the acidification check valve for setting.
As a further improvement of the invention, the sliding sleeve resetting mechanism comprises a sliding sleeve spring and a bushing, the upper end of the bushing is screwed in an internal thread at the lower end of the switching valve sliding sleeve, the lower end of the bushing is inserted into an inner cavity of the lower joint of the switching valve, the sliding sleeve spring surrounds the periphery of the bushing, the lower end of the sliding sleeve spring is supported on the upper end face of the lower joint of the switching valve, and the inner edge of the upper end of the sliding sleeve spring is pressed against the lower end face of the switching valve sliding sleeve. When the soluble ball is pressed to drive the sliding sleeve of the switch valve to move downwards, the lower end of the lining sleeve slides in the central hole of the lower joint of the switch valve, and the functions of guiding and stabilizing the spring of the sliding sleeve are achieved. When the pressure above the soluble ball disappears, the tension of the sliding sleeve spring pushes the switch valve sliding sleeve to move upwards, the inner port of the liquid outlet of the cylinder body is closed, and the acidification liquid outlet channel on the upper layer is closed.
As a further improvement of the invention, the outer wall of the lower end of the bushing is attached to the inner wall of the central hole of the lower connector of the switch valve, the middle section of the central hole of the lower connector of the switch valve is provided with an inner step of the lower connector of the switch valve, and the distance between the lower end surface of the bushing and the inner step of the lower connector of the switch valve is equal to the distance between the upper end surface of the sliding sleeve of the switch valve and the lower edge of the liquid outlet of the barrel. The lower extreme of bush and the centre bore of ooff valve lower clutch form good cooperation for the direction of bush is more accurate, and when the lower terminal surface of bush was down and supported and lean on ooff valve lower clutch inner step, the up end of ooff valve sliding sleeve has been down to the below of barrel liquid outlet, exposes the barrel liquid outlet completely, ensures the smoothness of acidizing fluid passageway on the one hand, and on the other hand has realized the location of ooff valve sliding sleeve lower stroke.
As a further improvement of the invention, a second inner step of the cylinder body is arranged at the position where the inner wall of the switch valve cylinder body is flush with the lower end face of the switch valve sliding sleeve, and the outer edge of the upper end of the sliding sleeve spring is abutted against the lower part of the second inner step of the cylinder body. The eccentric water distributor requires that a channel for the running of a throwing and fishing tool is not less than 46mm, the second inner step of the cylinder body can assist in positioning the upper stroke of the sliding sleeve spring, a cavity below the second inner step of the cylinder body provides an accommodating space for the sliding sleeve spring, the diameter of an inner hole of the bushing is enlarged as much as possible, and a larger downward channel is provided for a sealing steel ball, the throwing and fishing tool and other downhole instruments.
As a further improvement of the invention, at least two switching valve upper sealing rings are embedded in the periphery of the upper part of the switching valve sliding sleeve, at least two switching valve middle sealing rings are embedded in the periphery of the middle part of the switching valve sliding sleeve, and the liquid outlet of the cylinder is positioned between the switching valve upper sealing rings and the switching valve middle sealing rings in the height direction. The sealing washer seals up the ascending leakage clearance of barrel liquid outlet on the ooff valve, and the sealing washer seals up the decurrent leakage clearance of barrel liquid outlet among the ooff valve for before the ooff valve sliding sleeve was down, the acidizing fluid can not spill from the barrel liquid outlet.
As a further improvement of the invention, a lower switch valve joint outer step is arranged below an outer thread section of the lower switch valve joint, the lower end face of the switch valve cylinder body abuts against the lower switch valve joint outer step, a lower switch valve joint sealing section is arranged above the outer thread section of the lower switch valve joint, and at least two lower switch valve sealing rings are embedded in the periphery of the lower switch valve joint sealing section to realize sealing with the inner wall of the switch valve cylinder body. The outer step of the lower joint of the switch valve plays an axial positioning role in screwing of the lower joint of the switch valve, and at least two lower seal rings of the switch valve can be installed on the sealing section of the lower joint of the switch valve, so that the lower joint of the switch valve and the cylinder body of the switch valve are well sealed.
As a further improvement of the invention, the inner diameter of the upper end opening of the bell mouth of the switch valve sliding sleeve is equal to the inner diameter of the first inner step of the cylinder, and the inner diameter of the bushing is equal to the inner diameter of the switch valve sliding sleeve and is larger than the diameter of the sealing steel ball. The upper port of the bell mouth of the switch valve sliding sleeve is in smooth butt joint with the first inner step of the barrel, and the bushing is in smooth butt joint with the inner wall of the switch valve sliding sleeve, so that a sealing steel ball or a downhole instrument can smoothly go down.
Drawings
The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
FIG. 1 is a schematic structural diagram of a first-stage two-section eccentric acid injection integrated tubular column.
Fig. 2 is a cross-sectional view of the acidified check valve of fig. 1.
Fig. 3 is a front view of the switching valve of fig. 1.
In the figure: A. an on-off valve; B. an upper eccentric water distributor; C. a centralizer; D. a packer; E. a lower eccentric water distributor; F. a middle oil pipe; G. acidifying the check valve; H. a screen pipe; J. an oil pipe holder; K. a paint pipe; l. plug. 1. A check valve upper joint; 2. a key blocking seat; 2a, inserting grooves of the stop keys; 3. a catch key pin shaft; 4. a torsion spring; 5. a catch key; 6. a ball seat joint; 6a, a ball seat joint outer inserting groove; 6b, a ball seat joint O-shaped ring; 7. sealing the steel ball; 8. sealing the ball seat; 9. pressing a ring; 9a, pressing a ring shear pin; 10. a check valve lower joint; 10a, a check valve lower joint O-shaped ring; 11. an inner sleeve ball seat; 11a, internally sleeving an O-shaped ring; 11b, internally sleeving shear pins; 12. and a steel ball is sleeved in the steel ball. 13. A switching valve cylinder; tapered female threads 13 a; 13b, a first inner step of the cylinder; 13c, a cylinder liquid outlet; 13d, a second inner step of the cylinder; 14. a soluble ball; 15. a switching valve sliding sleeve; 15a, an upper sealing ring of the switch valve; 15b, a middle sealing ring of the switch valve; 16. a sliding sleeve spring; 17. a bushing; 18. a lower joint of the switch valve; 18a, a lower sealing ring of the switch valve; 18b, an inner step of a lower joint of the switch valve; and 18c, connecting the lower joint of the switch valve with an outer step.
Detailed Description
As shown in fig. 1, the one-stage two-stage eccentric acid injection integrated tubular column comprises an upper eccentric water distributor B corresponding to an upper water injection layer and a lower eccentric water distributor E corresponding to a lower water injection layer, wherein a centralizer C and a packer D are arranged between the upper eccentric water distributor B and the lower eccentric water distributor E, a switch valve a is arranged above the upper eccentric water distributor B, an intermediate oil pipe F is arranged below the lower eccentric water distributor E, an acidification check valve G is screwed below the intermediate oil pipe F, a sieve pipe H is screwed at the lower end of the acidification check valve G, an oil pipe fixer J is arranged below the sieve pipe H, a coating oil pipe K is connected below the oil pipe fixer J, and a plug L is screwed at the lower end of the coating oil pipe K.
As shown in fig. 2, the acidizing check valve G comprises a check valve upper joint 1 and a check valve lower joint 10, wherein the inner thread at the lower end of the check valve upper joint 1 is screwed on the upper part of the check valve lower joint 10, the lower port of the check valve upper joint 1 abuts against the outer step of the check valve lower joint, and the root of the outer step of the check valve lower joint is embedded with a check valve lower joint O-shaped ring 10a to seal with the inner wall of the check valve upper joint 1. An inner sleeve ball seat 11 is arranged in the middle section of an inner cavity of the lower joint 10 of the check valve, an outer step of the inner sleeve ball seat 11 is abutted to the lower part of an inner step of the lower joint of the check valve, and inner sleeve ball seat shear pin holes are uniformly formed in the circumference below the outer step of the inner sleeve ball seat; at least two inner sleeve shear pins 11b are uniformly screwed on the circumference of the middle section of the lower joint 10 of the check valve, and the inner end of each inner sleeve shear pin 11b is respectively embedded into the corresponding inner sleeve ball seat shear pin hole; the upper end of the central hole of the inner sleeve ball seat 11 is provided with a bell mouth for receiving the inner sleeve steel ball 12. An inner sleeve O-shaped ring 11a is embedded on the outer wall of the upper part of the inner sleeve ball seat 11 to realize sealing with the inner wall of the lower joint of the check valve.
The packer D on the pipe column is positioned between the two water injection layers, the acidification check valve G is arranged above the sieve pipe H, and positive and negative well washing can be carried out before ball throwing. Throwing 31mm of inner sleeve steel balls 12 from a wellhead, allowing the inner sleeve steel balls 12 to fall and seat at a bell mouth at the upper end of an inner sleeve ball seat 11, and pressing by a cement truck to seat a packer D in a sleeve to separate the annular space of an upper water injection layer and a lower water injection layer; and (3) continuing to pressurize, cutting off the inner sleeve shear pin 11b, descending the inner sleeve steel ball 12 and the inner sleeve ball seat 11 together, dropping into a tail pipe below the sieve tube H, opening a liquid flow channel of the acidification check valve G, and carrying out acidification operation on a lower water injection layer.
Then, a 48mm soluble ball 14 is put into the switch valve A, the pressure is held after the soluble ball 14 is set to enable the switch valve sliding sleeve 15 to slide downwards, the liquid outlet 13c of the cylinder body is opened, and the upper water injection layer is acidified. And a liquid flow channel of the acidification check valve G is used as a pressure transmission channel, so that the sliding sleeve 15 of the switching valve above can be smoothly opened.
The upper portion of check valve lower clutch 10 is equipped with the internal diameter and enlarges the section and peg graft and have the clamping ring 9 that upwards extends, the symmetry is equipped with clamping ring shear pin hole on the lower part circumference of clamping ring 9, evenly connect soon at least two clamping ring shear pins 9a on the upper portion circumference of check valve lower clutch 10, the interior end of each clamping ring shear pin 9a imbeds respectively in the clamping ring shear pin hole that corresponds, the upper portion periphery of clamping ring 9 has connect ball seat joint 6 soon, the lower part periphery wall of ball seat joint 6 realizes sealedly through ball seat joint O shape circle 6b and the inner wall of check valve upper clutch 1. The top of the compression ring 9 is provided with a sealing ball seat 8 for bearing the sealing steel ball 7, the outer edge of the top of the sealing ball seat 8 is pressed below the inner step of the ball seat joint 6, and the diameters of the central holes of the sealing ball seat 8 and the compression ring 9 are both larger than the diameter of the inner sleeve steel ball 12. And after the two water injection layers are acidified, a 40mm sealing steel ball 7 is put in, and the sealing steel ball 7 falls on the upper port of the sealing ball seat 8 for setting, so that the function of a conventional check valve can be realized.
The ball seat joint is characterized in that ball seat joint outer inserting grooves 6a with an upper end opening are symmetrically formed in the periphery of the upper end of the ball seat joint 6, a blocking key seat 2 is arranged above the ball seat joint 6, the upper portion of the blocking key seat 2 is connected to the inner wall of the upper portion of a check valve upper joint 1 in a rotating mode, a plurality of blocking key inserting grooves 2a are symmetrically formed in the circumferential wall of the lower portion of a center hole of the blocking key seat 2, blocking key pin shafts 3 are respectively inserted between two opposite side walls of each blocking key inserting groove 2a in a inserting mode, rotatable blocking keys 5 are respectively sleeved on each blocking key pin shaft 3, the lower ends of the blocking keys 5 are correspondingly inserted into the ball seat joint outer inserting grooves 6a corresponding to the blocking key pins, torsion springs 4 are respectively sleeved in the middle portions of the blocking key pin shafts 3, one ends of the torsion springs 4 are inserted into the corresponding blocking keys 5, and the other ends of the torsion springs.
After the sealing steel ball 7 is seated, the sealing steel ball 7 is used as a conventional check valve of a water injection pipe column, injected water enters the stratum from an eccentric water distributor, a water injection gate is opened to suppress pressure, a compression ring shear pin 9a is cut off, and the ball seat joint 6, the sealing steel ball 7, the sealing ball seat 8 and the compression ring 9 descend together until the bottom of the compression ring 9 abuts against an inner step of a lower joint 10 of the check valve; the ball seat joint outer inserting groove 6a releases the blocking key 5 due to sliding down, the blocking key 5 is elastically flat under the action of the tension of the torsion spring 4, namely the free end of each blocking key 5 vertically points to the axis of the blocking key seat 2, so that the sealing steel ball 7 is limited between the blocking key 5 and the sealing ball seat 8, and the sealing steel ball 7 cannot be washed out of the ball seat joint 6 during backwashing.
As shown in fig. 3, the switch valve a includes a switch valve cylinder 13, the lower end of the switch valve cylinder 13 is screwed with a switch valve lower joint 18, the upper port of the switch valve cylinder 13 is provided with a conical female thread 13a, a cylinder first inner step 13b is arranged below the conical female thread 13a, the middle section of the inner cavity of the switch valve cylinder 13 is provided with a switch valve sliding sleeve 15, the outer wall of the switch valve sliding sleeve 15 is attached to the inner wall of the switch valve cylinder 13, and the upper end surface of the switch valve sliding sleeve 15 abuts against the lower part of the cylinder first inner step 13 b; the upper end of the central hole of the switch valve sliding sleeve 15 is provided with a switch valve sliding sleeve bell mouth for the setting of the soluble ball 14; a through cylinder liquid outlet 13c is arranged below the cylinder first inner step 13b, and the inner port of the cylinder liquid outlet 13c is covered by a switch valve sliding sleeve 15; the lower end of the switch valve sliding sleeve 15 is provided with a sliding sleeve resetting mechanism for pushing the switch valve sliding sleeve to move upwards.
After the soluble ball 14 is thrown into and is seated at the upper port of the switch valve sliding sleeve 15, the cement truck is being pressed, the soluble ball 14 pushes the switch valve sliding sleeve 15 to slide downwards until the barrel liquid outlet 13c is exposed, acid liquid is injected into the pipe column through the cement truck at the moment, the acid liquid flows out of the barrel liquid outlet 13c, enters the upper water injection layer from the annular space of the pipe column, and the upper water injection layer is acidified. After the acid solution is fed completely, the displacing liquid is continuously injected, and the inner cavity of the pipe column is ensured to be filled with the displacing liquid; then the cement truck is turned off, the high pressure above the soluble ball 14 disappears, and the sliding sleeve resetting mechanism pushes the switch valve sliding sleeve 15 to move upwards to shield the liquid outlet 13c of the barrel body and close the acidification liquid outlet channel. Then the well is closed, the upper water injection layer and the lower water injection layer are subjected to acidification reaction, and the soluble ball 14 is dissolved. And the central channel of the switch valve A is unblocked again, and the sealing steel ball can smoothly pass through the central channel of the switch valve A and fall into the sealing ball seat of the acidizing check valve G for setting.
The sliding sleeve resetting mechanism comprises a sliding sleeve spring 16 and a bushing 17, the upper end of the bushing 17 is screwed in an internal thread at the lower end of the switch valve sliding sleeve 15, the lower end of the bushing 17 is inserted into an inner cavity of the switch valve lower joint 18, the sliding sleeve spring 16 surrounds the periphery of the bushing 17, the lower end of the sliding sleeve spring 16 is supported on the upper end surface of the switch valve lower joint 18, and the inner edge of the upper end of the sliding sleeve spring 16 abuts against the lower end surface of the switch valve sliding sleeve 15. When the soluble ball 14 is pressed to drive the switch valve sliding sleeve 15 to move downwards, the lower end of the bushing 17 slides in the central hole of the switch valve lower joint 18, and the function of guiding and stabilizing the sliding sleeve spring 16 is achieved. When the pressure above the soluble ball 14 disappears, the tension of the sliding sleeve spring 16 pushes the switch valve sliding sleeve 15 to move upwards, the inner port of the cylinder liquid outlet 13c is closed, and the acidification liquid outlet channel at the upper layer is closed.
The outer wall of the lower end of the bushing 17 is attached to the inner wall of a central hole of the lower switch valve connector 18, an inner step 18b of the lower switch valve connector is arranged in the middle section of the central hole of the lower switch valve connector, and the distance between the lower end face of the bushing 17 and the inner step 18b of the lower switch valve connector is equal to the distance between the upper end face of the switch valve sliding sleeve 15 and the lower edge of the barrel liquid outlet 13c. The lower end of the lining 17 and the center hole of the lower switch valve joint 18 form good matching, so that the guiding of the lining 17 is more precise, when the lower end face of the lining 17 moves downwards and abuts against the inner step 18b of the lower switch valve joint, the upper end face of the switch valve sliding sleeve 15 moves downwards to the lower part of the cylinder liquid outlet 13c, the cylinder liquid outlet 13c is completely exposed, on one hand, the smoothness of an acid liquid channel is ensured, and on the other hand, the positioning of the lower stroke of the switch valve sliding sleeve 15 is realized.
The inner wall of the switch valve cylinder 13 and the lower end face of the switch valve sliding sleeve 15 are parallel and level, a cylinder second inner step 13d is arranged, and the outer edge of the upper end of the sliding sleeve spring 16 abuts against the lower portion of the cylinder second inner step 13d. The second inner step 13d of the cylinder body can assist in positioning the upper stroke of the sliding sleeve spring 16, the concave cavity below the second inner step 13d of the cylinder body provides an accommodating space for the sliding sleeve spring 16, the diameter of the inner hole of the bushing 17 is enlarged as much as possible, and a larger downward passage is provided for the sealing steel ball and a downhole instrument.
At least two switching valve upper sealing rings 15a are embedded on the periphery of the upper part of the switching valve sliding sleeve 15, at least two switching valve middle sealing rings 15b are embedded on the periphery of the middle part of the switching valve sliding sleeve 15, and the barrel liquid outlet 13c is positioned between the switching valve upper sealing rings 15a and the switching valve middle sealing rings 15b in the height direction. The upward leakage gap of the cylinder liquid outlet 13c is sealed by the upper seal ring 15a of the switch valve, and the downward leakage gap of the cylinder liquid outlet 13c is sealed by the middle seal ring 15b of the switch valve, so that the acid liquor cannot leak from the cylinder liquid outlet 13c before the switch valve sliding sleeve 15 moves downwards.
The lower part of the external thread section of the lower switch valve joint 18 is provided with an outer step 18c of the lower switch valve joint, the lower end surface of the switch valve cylinder body 13 is abutted against the outer step 18c of the lower switch valve joint, the upper part of the external thread section of the lower switch valve joint is provided with a lower switch valve joint sealing section, and the periphery of the lower switch valve joint sealing section is embedded with at least two lower switch valve sealing rings 18a to realize sealing with the inner wall of the switch valve cylinder body 13. The outer step 18c of the lower switch valve joint has an axial positioning effect on the screwing of the lower switch valve joint 18, and at least two lower switch valve sealing rings 18a can be installed on the sealing section of the lower switch valve joint, so that the sealing between the lower switch valve joint 18 and the switch valve cylinder body 13 is good.
The inner diameter of the upper end opening of the bell mouth of the switch valve sliding sleeve is equal to the inner diameter of the first inner step 13b of the cylinder body, and the inner diameter of the bushing 17 is equal to the inner diameter of the switch valve sliding sleeve 15 and is larger than the diameter of the sealing steel ball. The upper port of the bell mouth of the switch valve sliding sleeve is smoothly butted with the first inner step 13b of the cylinder body, and the lining 17 is smoothly butted with the inner wall of the switch valve sliding sleeve 15, so that the sealing steel ball or the well descending instrument can smoothly descend.
The acidizing check valve G can be used for positive and negative well flushing before ball injection; an inner sleeve steel ball is put into the acidizing check valve G, and a packer D can be set (a Y341-114 packer can be adopted) by positive pressurization of a cement truck, so that an annulus between an upper water injection layer and a lower water injection layer is separated; and then continuously boosting the pressure to cut off the shear pin, enabling the inner sleeve steel ball and the inner sleeve ball seat to fall into a coating oil pipe K below the sieve pipe H, and enabling the acid liquid to descend along the inner cavity of the pipe column, enter the annular space from the sieve pipe H and then enter a lower water injection layer to acidify the lower water injection layer. After the acid liquid and the displacing liquid in the lower water injection layer are injected, the soluble ball 14 is thrown to seal the central pore passage of the switch valve A, the switch valve A is opened to the annular acid liquid passage, the acid liquid enters the upper water injection layer, and the upper water injection layer is acidified. After the upper water injection layer and the lower water injection layer are acidified, the soluble ball 14 is dissolved, the central hole channel of the switch valve A is communicated, the sealing steel ball is put into the acidified check valve G, so that the function of a conventional check valve is realized, and the layered water injection is realized through the upper eccentric water distributor B and the lower eccentric water distributor E. Only one trip of the pipe column is started, and the layer-by-layer acidification and the separate-layer water injection of two stratums are realized.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.
Claims (9)
1. The utility model provides an one-level two-stage section eccentric acid injection integration tubular column, includes with last water injection layer corresponding go up eccentric injection mandrel and with make a bet the corresponding lower eccentric injection mandrel of water injection layer, goes up eccentric injection mandrel and installs centralizer and packer, its characterized in that between the eccentric injection mandrel down: a switch valve is installed above the upper eccentric water distributor, an intermediate oil pipe is arranged below the lower eccentric water distributor, an acidification check valve is screwed below the intermediate oil pipe, the lower end of the acidification check valve is screwed with a sieve pipe, an oil pipe fixer is installed below the sieve pipe, a coating oil pipe is connected below the oil pipe fixer, and a screwed plug is screwed below the coating oil pipe;
the acidizing check valve comprises a check valve upper joint and a check valve lower joint, wherein internal threads at the lower end of the check valve upper joint are screwed at the upper part of the check valve lower joint, a lower port of the check valve upper joint abuts against an outer step of the check valve lower joint, an inner sleeve ball seat is arranged in the middle section of an inner cavity of the check valve lower joint, an outer step of the inner sleeve ball seat abuts against the lower part of the inner step of the check valve lower joint, and shear pin holes of the inner sleeve ball seat are uniformly formed in the circumference below the outer step of the inner sleeve ball seat; at least two inner sleeve shear pins are uniformly screwed on the circumference of the middle section of the lower joint of the check valve, and the inner end of each inner sleeve shear pin is respectively embedded into the corresponding shear pin hole of the inner sleeve ball seat; the upper end of the central hole of the inner sleeve ball seat is provided with a bell mouth for receiving the inner sleeve steel ball; the upper part of the lower joint of the check valve is provided with an inner diameter amplification section and is spliced with a compression ring extending upwards, the circumference of the lower part of the compression ring is symmetrically provided with compression ring shear nail holes, the circumference of the upper part of the lower joint of the check valve is uniformly screwed with at least two compression ring shear nails, the inner end of each compression ring shear nail is respectively embedded into the corresponding compression ring shear nail hole, and the periphery of the upper part of the compression ring is screwed with a ball seat joint; the top of clamping ring is equipped with the sealing ball seat of accepting the sealing steel ball, the top outer fringe of sealing ball seat is pressed the interior step below of ball seat joint, the centre bore diameter of sealing ball seat and clamping ring all is greater than the diameter of endotheca steel ball.
2. The one-stage two-section eccentric acid injection integrated tubular column of claim 1, wherein: the ball seat joint is characterized in that ball seat joint outer inserting grooves with openings at the upper ends are symmetrically formed in the periphery of the upper end of the ball seat joint, a blocking key seat is arranged above the ball seat joint, the upper portion of the blocking key seat is connected to the inner wall of the upper portion of the check valve upper joint in a rotating mode, a plurality of blocking key embedding grooves are symmetrically formed in the circumferential wall of the lower portion of the center hole of the blocking key seat, blocking key pin shafts are respectively inserted between two opposite side walls of each blocking key embedding groove in an inserting mode, rotatable blocking keys are respectively sleeved on each blocking key pin shaft, the lower ends of the blocking keys are correspondingly inserted into the corresponding ball seat joint outer inserting grooves, torsion springs are respectively sleeved in the middle of each blocking key pin shaft, one ends of the torsion springs are inserted into the corresponding blocking keys, and the other ends of the torsion springs are limited below the top walls.
3. The one-stage two-section eccentric acid injection integrated tubular column of claim 1, wherein: the switching valve comprises a switching valve barrel, the lower end of the switching valve barrel is screwed with a lower switching valve connector, the upper port of the switching valve barrel is provided with a conical female thread, a first barrel inner step is arranged below the conical female thread, the middle section of the inner cavity of the switching valve barrel is provided with a switching valve sliding sleeve, the outer wall of the switching valve sliding sleeve is attached to the inner wall of the switching valve barrel, and the upper end face of the switching valve sliding sleeve is abutted against the lower part of the first barrel inner step; the upper end of the central hole of the switch valve sliding sleeve is provided with a switch valve sliding sleeve bell mouth for seating and sealing a soluble ball; a through cylinder liquid outlet is arranged below the first inner step of the cylinder, and the inner port of the cylinder liquid outlet is covered by a switch valve sliding sleeve; and a sliding sleeve resetting mechanism for pushing the switching valve sliding sleeve to move upwards is arranged at the lower end of the switching valve sliding sleeve.
4. The one-stage two-section eccentric acid injection integrated tubular column according to claim 3, characterized in that: the sliding sleeve resetting mechanism comprises a sliding sleeve spring and a bushing, the upper end of the bushing is screwed in the internal thread at the lower end of the switching valve sliding sleeve, the lower end of the bushing is inserted into the inner cavity of the lower joint of the switching valve, the sliding sleeve spring surrounds the periphery of the bushing, the lower end of the sliding sleeve spring is supported on the upper end face of the lower joint of the switching valve, and the inner edge of the upper end of the sliding sleeve spring abuts against the lower end face of the switching valve sliding sleeve.
5. The one-stage two-section eccentric acid injection integrated tubular column of claim 4, wherein: the lower extreme outer wall of bush with the downthehole wall laminating of the centre of ooff valve lower clutch, the middle section of ooff valve lower clutch centre bore is equipped with the interior step of ooff valve lower clutch, the lower terminal surface of bush with distance between the interior step of ooff valve lower clutch equals the up end of ooff valve sliding sleeve with distance between the lower edge of barrel liquid outlet.
6. The one-stage two-section eccentric acid injection integrated tubular column of claim 4, wherein: the inner wall of the switch valve cylinder body and the lower end face of the switch valve sliding sleeve are parallel and level, a cylinder body second inner step is arranged, and the upper end outer edge of the sliding sleeve spring is abutted to the lower portion of the cylinder body second inner step.
7. The one-stage two-section eccentric acid injection integrated tubular column of claim 4, wherein: the upper portion periphery of ooff valve sliding sleeve inlays and is equipped with at least twice ooff valve upper seal circle, the middle part periphery of ooff valve sliding sleeve inlays and is equipped with at least twice ooff valve middle seal circle, the barrel liquid outlet is located in the direction of height between ooff valve upper seal circle and the ooff valve middle seal circle.
8. The one-stage two-section eccentric acid injection integrated tubular column according to claim 3, characterized in that: the external screw thread section below of ooff valve lower clutch is equipped with the outer step of ooff valve lower clutch, the lower terminal surface of ooff valve barrel supports and leans on the outer step of ooff valve lower clutch, the top of the external screw thread section of ooff valve lower clutch is equipped with the sealed section of ooff valve lower clutch, the periphery of the sealed section of ooff valve lower clutch is inlayed and is equipped with at least twice ooff valve lower seal circle with the inner wall of ooff valve barrel realizes sealedly.
9. The one-stage two-section eccentric acid injection integrated tubular column of claim 4, wherein: the inner diameter of the upper end opening of the horn-shaped opening of the switch valve sliding sleeve is equal to the inner diameter of the first inner step of the barrel, and the inner diameter of the bushing is equal to the inner diameter of the switch valve sliding sleeve and larger than the diameter of the sealing steel ball.
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| US8955543B2 (en) * | 2010-05-24 | 2015-02-17 | Blackhawk Specialty Tools, Llc | Large bore auto-fill float equipment |
| CN201810292U (en) * | 2010-10-22 | 2011-04-27 | 中国石油天然气股份有限公司 | Separated layer water injection process tubular column |
| US20140202713A1 (en) * | 2013-01-18 | 2014-07-24 | Halliburton Energy Services, Inc. | Well Intervention Pressure Control Valve |
| CN204299556U (en) * | 2014-11-18 | 2015-04-29 | 中国石油化工股份有限公司 | A kind of separate layer acid treatment and down-hole dispensing integrated pipe column |
| US10184316B2 (en) * | 2015-09-03 | 2019-01-22 | Baker Hughes, A Ge Company, Llc | Three position interventionless treatment and production valve assembly |
| CN205036361U (en) * | 2015-09-07 | 2016-02-17 | 中国石油化工股份有限公司 | Perforation seperated layer water injection integration tubular column |
| CN207568578U (en) * | 2017-11-20 | 2018-07-03 | 中国石油天然气股份有限公司 | Flood suction tubing string |
| CN208686366U (en) * | 2018-09-04 | 2019-04-02 | 中国石油化工集团公司 | Water injection well well workover system with pressure |
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