CN105781506A - Method for separate layer water injection for oil well - Google Patents
Method for separate layer water injection for oil well Download PDFInfo
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- CN105781506A CN105781506A CN201410803135.1A CN201410803135A CN105781506A CN 105781506 A CN105781506 A CN 105781506A CN 201410803135 A CN201410803135 A CN 201410803135A CN 105781506 A CN105781506 A CN 105781506A
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Abstract
The invention discloses a method for separate layer water injection for an oil well, and belongs to the field of petroleum extraction. The method comprises the following steps of putting a separate layer water injection pipe column into the oil well; when the separate layer water injection pipe column is put into a preset depth, performing setting operation on a packer; in the process of performing the setting operation on the packer, shearing a ball pin in the upper part of a snubbing double-ball seat, so as to form a double-ball seat for separate layer water injection; and performing separate layer water injection operation according to the double-ball seat used for separate layer water injection. According to the method disclosed by the invention, the snubbing double-ball seat is arranged on the separate layer water injection pipe column, so that in the construction process of the separate layer water injection, water under the snubbing double-ball seat cannot be jetted to a well opening of a water injection well; in the process of setting, the ball pin in the upper part of the snubbing double-ball seat is sheared, so that the double-ball seat for separate layer water injection is formed; the separate layer water injection of the water injection well can be realized without using a complex high-density hydraulic well which is high in cost.
Description
Technical field
The present invention relates to field of petroleum exploitation, particularly to a kind of method of oil well delamination water filling.
Background technology
Along with progressively going deep into of oil gas field waterflooding extraction, water injection well layering water flooding construction is more and more frequent, seperated layer water injection refers to and enters packer under in water injection well, the oil reservoir differed greatly is separated, layering water distribution is carried out again with injection well downhole flow regulator, make high permeability formation water injection rate be controlled, and middle-low permeability oil-bearing stratum flooding amount is strengthened, and makes all kinds of oil reservoir to play a role.
Under normal circumstances, it is all adopt higher density fluid kill-job or open flow means to carry out operation after low for well pressure drop.
In the process realizing the present invention, inventor have found that prior art at least there is problems in that
The operating type cost of the higher density fluid kill-job adopted under normal circumstances is high, the time is long, and kill-job operation meeting blocking underground fluid swivels, thus affecting dispensing effect；If adopting the operating type of open flow blood pressure lowering, then stratum can discharge big energy, brings immeasurable loss to subsequent production, and can cause substantial amounts of ground pollution.
Summary of the invention
In order to solve problem of the prior art, a kind of method embodiments providing oil well delamination water filling.Described technical scheme is as follows:
A kind of method embodiments providing oil well delamination water filling, described method includes:
Separate layer water injection string is entered under in oil well, wherein, described separate layer water injection string includes: pass through threaded boll-weevil hanger, oil pipe, pipe nipple, described oil pipe, packer, described oil pipe, injection well downhole flow regulator, described oil pipe, described packer, described oil pipe, described injection well downhole flow regulator, described oil pipe, described packer, described oil pipe, described injection well downhole flow regulator, described oil pipe, the double; two ball seat of no killing well, screen casing and plug from well head；
When described separate layer water injection string is lowered into the predetermined degree of depth, described packer is set operation, in the process that described packer is set operation, double; two for described no killing well ball seat internal upper part ball pin nails are cut off, form the double; two ball seats of seperated layer water injection；
Utilize and carry out seperated layer water injection operation with the described seperated layer water injection separate layer water injection string of double; two ball seats.
Preferably, described oil pipe is 73 millimeters of heavy wall tubings；Described pipe nipple is 73 millimeters of heavy wall tubing pipe nipples；Described packer is Y341-114 packer；Described injection well downhole flow regulator is bridge-type concentric roater regulator.
Preferably, the length of described pipe nipple is 1 meter.
Preferably, described method also includes:
Enter the tubing plug with the first diameter under in down-hole casing to the tubing string of former well oil pipe, carry out the plugging operations of described former well oil pipe, open oil pipe gate after setting, observe well head with or without flooded conditions；
Dismounting well head also installs operation device under pressure and hydraulic control system at described well head；
Described former well oil pipe and described tubing plug is tripped out in described down-hole casing；
The oil pipe of described former well oil pipe is stung wash clean, with the oil-pipeline path-ventilating gauge with first size, oil pipe is carried out latus rectum operation on ground；
Entering drifting tubing string under in described down-hole casing and carry out drifting operation, described drifting tubing string includes the oil pipe being sequentially connected with, the jack rabbit with the second size and jet check valve, wherein, in the continuous drifting preset times of the section of setting；
Entering scraper column of casing under in described down-hole casing and down-hole casing inwall is carried out scraping, remove the inwall obturator on described down-hole casing inwall, wherein, described scraper column of casing includes casing scraper；
Pump into flushing fluid to oil pipe, clean pit shaft and the shaft bottom of described down-hole casing.
Preferably, the first diameter of described tubing plug is 42 millimeters；The first size of described oil-pipeline path-ventilating gauge is that basal diameter 58 millimeters is multiplied by 0.5 meter；The second of described jack rabbit is of a size of basal diameter 118 millimeters and is multiplied by 1.2 meters；The diameter of described casing scraper is 140 millimeters.
Preferably, the described preset times of continuous drifting is 3 times.
Preferably, before described utilization uses the separate layer water injection string of double; two ball seats to carry out seperated layer water injection operating procedure with described seperated layer water injection, described method also includes:
Well head is installed, enters seal-checking instrument under in described oil well and carry out testing envelope, after testing sealing lattice, proceed to described utilization carry out seperated layer water injection operating procedure with the described seperated layer water injection separate layer water injection string of double; two ball seats.
The technical scheme that the embodiment of the present invention provides has the benefit that
The method of the oil well delamination water filling that the embodiment of the present invention provides, by arranging the double; two ball seat of no killing well on separate layer water injection string, make in seperated layer water injection job execution process, water below the double; two ball seat of no killing well will not be ejected into the well head of water injection well, and in the process set, double; two for no killing well ball seat internal upper part ball pin nails are cut off, form the double; two ball seats of seperated layer water injection；Without using complex and high cost higher density fluid kill-job just can realize the seperated layer water injection of water injection well, and the formation damage avoiding the mode adopting open flow blood pressure lowering in the process of seperated layer water injection and causing and outer pollution discharging.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the method flow diagram of the oil well delamination water filling that the embodiment of the present invention one provides；
Fig. 2 is the method flow diagram of the oil well delamination water filling that the embodiment of the present invention two provides.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Unless otherwise defined, technical term used herein or scientific terminology should be and have the ordinary meaning that the personage of general technical ability understands in art of the present invention." first ", " second " that use in present patent application description and claims and similar word are not offered as any order, quantity or importance, and are used only to distinguish different ingredients.Equally, the similar word such as " " or " " does not indicate that quantity limits yet, and indicates that and there is at least one." connection " or " being connected " etc., similar word was not limited to physics or machinery connection, but can include electrical connection, no matter was direct or indirectly.
Embodiment one
Referring to Fig. 1, this enforcement provides a kind of method of oil well delamination water filling, and the method includes:
Step 100, in oil well under enter separate layer water injection string, wherein, separate layer water injection string includes: pass through threaded boll-weevil hanger, oil pipe, pipe nipple, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, the double; two ball seat of no killing well, screen casing and plug from well head.
Step 101, when layered water injection pipe is lowered into the predetermined degree of depth, packer is set operation, in the process that packer is set operation, double; two for no killing well ball seat internal upper part ball pins nails is cut off, form the double; two ball seats of seperated layer water injection.
Step 102, utilization carry out seperated layer water injection operation with the seperated layer water injection separate layer water injection string of double; two ball seats.
By above operation, by arranging the double; two ball seat of no killing well on separate layer water injection string, make in seperated layer water injection job execution process, water below the double; two ball seat of no killing well will not be ejected into the well head of water injection well, and in the process set, double; two for no killing well ball seat internal upper part ball pin nails are cut off, form the double; two ball seats of seperated layer water injection；Without using complex and high cost higher density fluid kill-job just can realize the seperated layer water injection of water injection well.
Embodiment two
Referring to Fig. 2, a kind of method present embodiments providing oil well delamination water filling, the method includes:
Step 200, vehicle carried well repairing machine in down-hole casing under enter the tubing plug with the first diameter to the tubing string of former well oil pipe, carry out the plugging operations of former well oil pipe, open oil pipe gate after setting, observe well head with or without flooded conditions.
Wherein, the first diameter of tubing plug is 42 millimeters.
Wherein, when observing that well head has flooded conditions, illustrate that the plugging operations to former well oil pipe is unsuccessful, it is necessary to re-start the plugging operations of former well oil pipe.
Step 201, vehicle carried well repairing machine dismounting well head also installs operation device under pressure and hydraulic control system at well head.
Wherein, it is ready for follow-up pressure test for installing operation device under pressure and hydraulic control system at well head.
Step 202, vehicle carried well repairing machine trip out former well oil pipe and tubing plug in down-hole casing.
Specifically, vehicle carried well repairing machine is by controlling hydraulic control system and operation device under pressure, and speed limit with pressure trips out former well oil pipe and tubing plug.
The oil pipe of former well oil pipe is stung wash clean by step 203, boiler car, with the oil-pipeline path-ventilating gauge with first size, oil pipe is carried out latus rectum operation on ground.
Wherein, the first size of oil-pipeline path-ventilating gauge is that basal diameter 58 millimeters is multiplied by 0.5 meter.
Step 204, vehicle carried well repairing machine in down-hole casing under enter drifting tubing string and carry out drifting operation, drifting tubing string includes the oil pipe being sequentially connected with, the jack rabbit with the second size and jet check valve, wherein, in the continuous drifting preset times of the section of setting.
Specifically, the drifting tubing string into the jack rabbit with the second size depressed by vehicle carried well repairing machine band in down-hole casing, drifting tubing string includes the oil pipe being sequentially connected with, the jack rabbit with the second size and jet check valve, from well head drifting to shaft bottom, the continuous drifting of the section of setting 3 times, the speed of operation of drifting tubing string controls at 10 to 20 meters per minute.
Wherein, oil pipe, there is the jack rabbit of the second size, jet check valve is threaded connection.
Wherein, the second of jack rabbit is of a size of basal diameter 118 millimeters and is multiplied by 1.2 meters.
Step 205, vehicle carried well repairing machine in down-hole casing under enter scraper column of casing down-hole casing inwall carried out scraping, remove the inwall obturator on down-hole casing inwall, wherein, scraper column of casing includes casing scraper.
Wherein, inwall obturator includes but not limited to: the dirt of down-hole casing inwall, dead oil.
Wherein, scraper column of casing includes oil pipe, oil pipe variable buckle joint and casing scraper, oil pipe connected pipes variable buckle joint, and oil pipe variable buckle joint connects casing scraper, casing scraper connected pipes variable buckle joint, and oil pipe variable buckle joint lower end connects jet check valve.
Wherein, the diameter of casing scraper is 140 millimeters.
Step 206, pump truck pump into flushing fluid to oil pipe, clean pit shaft and the shaft bottom of down-hole casing.
Specifically, vehicle carried well repairing machine pumps into flushing fluid to oil pipe, enters from oil pipe, goes out from oil jacket annular space, cleans pit shaft and shaft bottom, and the displacement control of flushing fluid is at 25 to 30 cubic metres per hour.
Step 207, vehicle carried well repairing machine in oil well under enter separate layer water injection string, wherein, separate layer water injection string includes: pass through threaded boll-weevil hanger, oil pipe, pipe nipple, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, packer, oil pipe, injection well downhole flow regulator, oil pipe, the double; two ball seat of no killing well, screen casing and plug from well head.
Wherein, oil pipe is 73 millimeters of heavy wall tubings；Pipe nipple is 73 millimeters of heavy wall tubing pipe nipples；Packer is Y341-114 packer；Injection well downhole flow regulator is bridge-type concentric roater regulator.
Step 208, when separate layer water injection string is lowered into the predetermined degree of depth, packer is set operation by pump truck, in the process that packer sets operation, is cut off by double; two for no killing well ball seat internal upper part ball pins nails, forms the double; two ball seats of seperated layer water injection.
Specifically, separate layer water injection string is lowered into projected depth, after magnetic orientation school regulates the position of separate layer water injection string deeply, vehicle carried well repairing machine connects 1 meter of tubing nipple at well mouth oil pipe hanger threaded upper ends, separate layer water injection string is lifted up 0.4 meter, pump truck sets by suppressing in oil pipe, and Stress control is promoted to 5 MPas of voltage stabilizings 5 minutes by 0 MPa；Double; two for no killing well ball seat internal upper part ball pin nails are cut off, forms the double; two ball seats of seperated layer water injection；Then again from 5 MPas, pressure being risen to 10 MPas successively, 10 MPas rise to 15 MPas, 5 minutes voltage stabling control of every minor tick.Final pressure controls by 15 MPas to 20 MPas, and voltage stabilizing observes pressure after 15 minutes and sleeve pipe returns the water yield, then puts down boll-weevil hanger, lays down 1 meter of tubing nipple, set.
Step 209, vehicle carried well repairing machine install well head, enter seal-checking instrument and carry out testing envelope under in oil well.
Specifically, vehicle carried well repairing machine installs well head, connects to enter measurement and adjustment instrument under after water filling flow process and open water nozzle and then enter seal-checking instrument down again layer separating packer is tested envelope.
Step 210, after testing sealing lattice, utilize and carry out seperated layer water injection operation with the seperated layer water injection separate layer water injection string of double; two ball seats.
Specifically, hand over well by the normal water filling of geology injection allocation after testing sealing lattice, undertaken surveying by geological layering injection allocation after 1 week pressure stability of water filling and adjust.
By example below, embodiment two is described further.
Pool 70-7.
Tuberculosis, penetrated out 6 oil reservoirs such as 23#, 25#, 27#, 28#, 31#, 32#, joined 40 cubic metres day at initial stage on August 6th, 2010, pump pressure 22.6 MPas, oil pressure 13.2 MPas, day note 43 cubic metres.For alleviating interlayer contradiction, improve waterflooding effect, apply dispensing with pressure on April 19th, 2014 and again this well is carried out dispensing, oil pressure 14.8 MPas after dispensing, day note 50 cubic metres, effectively alleviates interlayer contradiction, and corresponding oil well oil increasing effect is notable, by the end of on July 31st, 2014, corresponding oil well is accumulative increased oil 6 tons.
| Level number | Well section (rice) | Thickness (rice) | Intake profile |
| 23 | 2471.0-2474.6 | 3.6 | 3.56% |
| 25 | 2490.0-2495.0 | 5.0 | |
| 27 | 2504.0-2506.4 | 2.4 | 8.67% |
| 28 | 2511.0-2513.0 | 2.0 | |
| 31 | 2543.5-2547.5 | 4.0 | 15.86% |
| 32 | 2553.0-2562.0 | 9.0 | 71.91% |
This dispensing is constructed, it is desirable to, packer is stuck between 28#-31# oil reservoir, and packer 1 designs stuck point 2469 meters, and packer 2 designs stuck point 2528 meters, separate layer water injection string depth of setting 2558 meters, 2570.52 meters, current artificial bottom of a well.
One, preparation of construction
A, closure oil pipe: the tubing plug of lower diameter 42 millimeters to former well casing column bottom blocks, setting oil pipe gate of opening, observe well head without overflow.
B, band pressure device is installed: dismounting well head, install operation device under pressure and hydraulic control system, erection of derrick, to preparative work before constructions such as operation device under pressure pressure testing and the tests of anti-top.
C, trip out former well casing post: speed limit with pressure plays former well oil pipe and blanking plug.
D, with boiler car, oil pipe is stung wash clean, with the oil-pipeline path-ventilating gauge being of a size of basal diameter 58 millimeters × 0.5 meter, oil pipe is carried out by root latus rectum on ground；It is of a size of 58 millimeters × 0.5 meter oil-pipeline path-ventilating gauge of basal diameter in ground use to carry out oil pipe by root latus rectum being the method that in this area, technology and operator know, is not describing in detail.
E, drifting: in down-hole casing, under speed limit with pressure, enter the drifting tubing string with the jack rabbit being of a size of basal diameter 118 millimeters × 1.2 meters.Drifting tubing string includes oil pipe, the jack rabbit of basal diameter 118 millimeters × 1.2 meters, jet check valve, and drifting tubing string connects jack rabbit for tubing round thread from top to bottom from well head；Drifting is to 2570.52 meters, artificial bottom of a well, at perforation and the continuous latus rectum of the section of setting 2460-2570 rice 3 times, it is ensured that unblocked, latus rectum speed controlling is per minute at 10 to 20 meters.
F, sleeve pipe scraping: entering the casing scraper with diameter 140 millimeters under in down-hole casing and full well section internal surface of sleeve pipe carries out the scraping of a brill, scraping, to 2570 meters, removes the dirt of down-hole casing inwall, dead oil and other internal surface of sleeve pipe obturator.Scraper column of casing includes oil pipe, oil pipe variable buckle joint, the casing scraper of diameter 140 millimeters and jet check valve, it is oil pipe from top to bottom from well head, oil pipe lower end connected pipes variable buckle joint, oil pipe variable buckle joint lower end connects casing scraper, casing scraper lower end connected pipes variable buckle joint, oil pipe variable buckle joint lower end connects jet check valve；Oil pipe, oil pipe variable buckle joint are threadeded with between casing scraper, jet check valve.
G, well-flushing: pumping into clear water from oil pipe and cook flushing fluid, flushing fluid returns out from oil jacket annular space, the displacement control of flushing fluid at 25 to 30 cubic metres per hour, treats that returning out clear water from oil jacket stops well-flushing.
Two, separate layer water injection string construction
A, under enter separate layer water injection string: separate layer water injection string is followed successively by from top to bottom by well head: boll-weevil hanger 1 meter, 73 millimeters of heavy wall tubings 2435.38 meters, 73 millimeters of 1 meter of heavy wall tubing pipe nipples 1.03 meters, 73 millimeters of heavy wall tubings 19.38 meters, packer 1.28 meters protected by Y341-114 set, 73 millimeters of heavy wall tubings 9.6 meters, bridge-type concentric roater regulator 0.59 meter, 73 millimeters of heavy wall tubings 48.28 meters, Y341-114 packer 1.28 meters, 73 millimeters of heavy wall tubings 19.25 meters, bridge-type concentric roater regulator 0.59 meter, 73 millimeters of heavy wall tubings 19.02 meters, the double, two ball seat of no killing well, screen casing and plug 2 meters.Separate layer water injection string running speed is less than 30 per hour.
B, packer setting: under enter projected depth, magnetic orientation school regulates the tubing string degree of depth deeply, then connect 1 meter of long tubing nipple at well mouth oil pipe hanger threaded upper ends and lift up tubing string 0.4 meter, pump truck sets by suppressing in oil pipe, Stress control was by 0 MPa to 5 MPa voltage stabilizing 5 minutes, successively again from 5 MPas to 10 MPas, 10 MPas to 15 MPas, 5 minutes voltage stabling control of every minor tick.Final pressure controls by 15 MPas to 20 MPas, and voltage stabilizing observes pressure after 15 minutes and sleeve pipe returns the water yield, then lays down 1 meter of long tubing nipple, has set.
Three, completion
Well head is installed, connects water filling flow process, under enter after measurement and adjustment instrument opens water nozzle, to enter down seal-checking instrument again and carry out testing envelope, after testing sealing lattice, notice production unit carries out normal water filling.Seperated layer water injection has been constructed.
The method of the oil well delamination water filling that the embodiment of the present invention provides, by arranging the double; two ball seat of no killing well on separate layer water injection string, make in seperated layer water injection job execution process, water below the double; two ball seat of no killing well will not be ejected into the well head of water injection well, and in the process set, double; two for no killing well ball seat internal upper part ball pin nails are cut off, form the double; two ball seats of seperated layer water injection；Without using complex and high cost higher density fluid kill-job just can realize the seperated layer water injection of water injection well, and the formation damage avoiding the mode adopting open flow blood pressure lowering in the process of seperated layer water injection and causing and outer pollution discharging.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the method for an oil well delamination water filling, it is characterised in that described method includes:
Separate layer water injection string is entered under in oil well, wherein, described separate layer water injection string includes: pass through threaded boll-weevil hanger, oil pipe, pipe nipple, described oil pipe, packer, described oil pipe, injection well downhole flow regulator, described oil pipe, described packer, described oil pipe, described injection well downhole flow regulator, described oil pipe, described packer, described oil pipe, described injection well downhole flow regulator, described oil pipe, the double; two ball seat of no killing well, screen casing and plug from well head；
When described separate layer water injection string is lowered into the predetermined degree of depth, described packer is set operation, in the process that described packer is set operation, double; two for described no killing well ball seat internal upper part ball pin nails are cut off, form the double; two ball seats of seperated layer water injection；
Utilize and carry out seperated layer water injection operation with the described seperated layer water injection separate layer water injection string of double; two ball seats.
2. method according to claim 1, it is characterised in that described oil pipe is 73 millimeters of heavy wall tubings；Described pipe nipple is 73 millimeters of heavy wall tubing pipe nipples；Described packer is Y341-114 packer；Described injection well downhole flow regulator is bridge-type concentric roater regulator.
3. method according to claim 2, it is characterised in that the length of described pipe nipple is 1 meter.
4. method according to claim 1, it is characterised in that described method also includes:
Enter the tubing plug with the first diameter under in down-hole casing to the tubing string of former well oil pipe, carry out the plugging operations of described former well oil pipe, open oil pipe gate after setting, observe well head with or without flooded conditions；
Dismounting well head also installs operation device under pressure and hydraulic control system at described well head；
Described former well oil pipe and described tubing plug is tripped out in described down-hole casing；
The oil pipe of described former well oil pipe is stung wash clean, with the oil-pipeline path-ventilating gauge with first size, oil pipe is carried out latus rectum operation on ground；
Entering drifting tubing string under in described down-hole casing and carry out drifting operation, described drifting tubing string includes the oil pipe being sequentially connected with, the jack rabbit with the second size and jet check valve, wherein, in the continuous drifting preset times of the section of setting；
Entering scraper column of casing under in described down-hole casing and down-hole casing inwall is carried out scraping, remove the inwall obturator on described down-hole casing inwall, wherein, described scraper column of casing includes casing scraper；
Pump into flushing fluid to oil pipe, clean pit shaft and the shaft bottom of described down-hole casing.
5. method according to claim 4, it is characterised in that the first diameter of described tubing plug is 42 millimeters；The first size of described oil-pipeline path-ventilating gauge is that basal diameter 58 millimeters is multiplied by 0.5 meter；The second of described jack rabbit is of a size of basal diameter 118 millimeters and is multiplied by 1.2 meters；The diameter of described casing scraper is 140 millimeters.
6. method according to claim 4, it is characterised in that the described preset times of drifting is 3 times continuously.
7. method according to claim 1, it is characterised in that before described utilization uses the separate layer water injection string of double; two ball seats to carry out seperated layer water injection operating procedure with described seperated layer water injection, described method also includes:
Well head is installed, enters seal-checking instrument under in described oil well and carry out testing envelope, after testing sealing lattice, proceed to described utilization carry out seperated layer water injection operating procedure with the described seperated layer water injection separate layer water injection string of double; two ball seats.
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| CN110399640A (en) * | 2019-06-17 | 2019-11-01 | 中国石油天然气股份有限公司 | A kind of dispensing well dispensing technical limits comprehensive judgement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107762459A (en) * | 2016-08-22 | 2018-03-06 | 中国石油天然气股份有限公司 | Separate layer water injection string |
| CN107762459B (en) * | 2016-08-22 | 2020-04-10 | 中国石油天然气股份有限公司 | Separate-layer water injection pipe column |
| CN110399640A (en) * | 2019-06-17 | 2019-11-01 | 中国石油天然气股份有限公司 | A kind of dispensing well dispensing technical limits comprehensive judgement method |
| CN110399640B (en) * | 2019-06-17 | 2022-03-29 | 中国石油天然气股份有限公司 | Comprehensive judgment method for separate injection technical boundary of separate injection well |
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