CN103967464B - Concentric pipe heat tracing natural gas exploitation method and special pipe column - Google Patents
Concentric pipe heat tracing natural gas exploitation method and special pipe column Download PDFInfo
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- CN103967464B CN103967464B CN201310035986.1A CN201310035986A CN103967464B CN 103967464 B CN103967464 B CN 103967464B CN 201310035986 A CN201310035986 A CN 201310035986A CN 103967464 B CN103967464 B CN 103967464B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000003345 natural gas Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 112
- 238000010438 heat treatment Methods 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 49
- 239000007924 injection Substances 0.000 claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000005516 engineering process Methods 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 241000521257 Hydrops Species 0.000 description 8
- 206010030113 Oedema Diseases 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004620 low density foam Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- Geophysics And Detection Of Objects (AREA)
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Abstract
The invention discloses a concentric pipe heat tracing natural gas exploitation method and a special pipe column thereof. The method comprises the following steps: assembling and setting a concentric pipe heat tracing gas injection gas production process pipe column, wherein the pipe column comprises a tubing string (1), a tubing string (2), a casing string (3), a connecting short section (5), an underground restrictor main body (6), an underground restrictor nozzle (7) and the like; installing a gas production wellhead; installing a ground gas heating device; the natural gas is heated and injected into an annular space between the tubing string (1) and the tubing string (2), and returns into the tubing string (1) through the high-temperature gas discharge hole (4), the natural gas produced by the stratum flows through a nozzle of the underground restrictor to generate a negative pressure area, the high-temperature natural gas heated on the ground easily flows into the tubing string (1) without external pressure under the driving of the negative pressure at the high-temperature gas discharge hole (4), and is mixed with the natural gas produced by the stratum and returns to the ground through the tubing string (1). The invention is mainly used for solving the problem of liquid accumulation at the bottom of the well in the production of the gas well.
Description
Technical field
The present invention relates to a kind of concentric tube heat tracing natural gas exploiting method and a kind of special tubing string.
Background technology
In the various techniques of gas well exploitation, getting well with bad of gas well development effectiveness, directly influence the benefit of production unit exploitation, be also directly connected to the length in stable yields cycle, the height of recovery ratio.After in entering particular with gas field after development period, the contradiction such as strata pressure declines, yield reduction, shaft bottom hydrops highlights, and the benefit of gas field development is played conclusive effect by the Technology that at this moment gas well is developed always.
At present, the flow string structure of reducer is installed in the commonly used down-hole of the Technology of gas field development.The shortcoming of this technology is: (1) shaft bottom is once hydrops, it is necessary to discharged by shaft bottom hydrops from oil jacket annular space from ground nitrogen injection or low density foam.This method not only cost puts into and also reduces gas production time and yield more.(2) need repeatedly steel wire operation to carry out pulling reducer, card easily occurs, falls accident, it is necessary to increase pulling operating cost.
Summary of the invention
For the defect that above-mentioned prior art exists, the technical problem to be solved in the present invention is to provide a kind of concentric tube heat tracing natural gas exploiting method, solve during gas field produces shaft bottom once hydrops, the problem needing to be discharged by shaft bottom hydrops from oil jacket annular space nitrogen injection or low density foam continually, removes pulling underground throttle device flow chart from.
For solving above-mentioned technical problem, concentric tube heat tracing natural gas exploiting method of the present invention, comprise the steps:
The first step, assemble and under enter concentric tube heat tracing gas injection gas producing technology tubing string: this concentric tube heat tracing gas injection gas producing technology tubing string by tubing string 1, tubing string 2, casing string 3, couple pipe nipple 5, underground throttle device main body 6, underground throttle device nozzle 7, underground throttle device supporter 8 and supporter 9 form, above-mentioned tubing string 2 is placed in casing string 3, and tubing string 2 is threadeded with supporter 9 by coupling pipe nipple 5；Above-mentioned tubing string 1 is placed in tubing string 2, tubing string 1 is threadeded with underground throttle device supporter 8, underground throttle device nozzle 7 is embedded in underground throttle device main body 6 lower end inside and threaded, underground throttle device main body 6 is supported by underground throttle device supporter 8, underground throttle device main body 6 and underground throttle device supporter 8 sidewall arrange high-temperature gas tap 4, and tubing string 1 is supported by the supporter 9 of tubing string 2 lower end；
Second step, gas production wellhead is installed: the casing flange pipe nipple on concentric double pipe stratified injection water well head is threadeded with casing string 3, threaded with tubing string 2 in outer tube tubing hanger lower end in big four on concentric double pipe stratified injection water well head, threadeding with tubing string 1 in the interior pipe tubing hanger lower end of the interior pipe four-way lower end on concentric double pipe stratified injection water well head, and carries out pressure testing by the pressure testing standard of gas production wellhead；
null3rd step，Ground gas-heating apparatus is installed: this ground gas-heating apparatus is by needing heated natural gas coil pipe 12、In heating jacket 13 and heating, pipe 16 forms，Heated natural gas coil pipe 12 is needed to be set to helical form，Heated natural gas coil pipe 12 is needed to be arranged in heating jacket 13，Heating jacket 13 two ends are welded and fixed with needing heated natural gas coil pipe 12，Natural gas entrance 14 need to be heated threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground，The heating gas outlet day after tomorrow 11 is threadeded with the outer tube four-way gate valve on the concentric double pipe stratified injection water well head of ground，In heating, pipe 16 is positioned at heating jacket center，In heating, pipe 16 two ends and heating jacket 13 are welded and fixed，In heating, threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground in burning gas entrance 15 one end of pipe 16，In heating, the other end burning use gas of pipe 16 exports 17 and atmosphere，After heating, gas outlet 11 pipeline is provided with thermometer；
4th step, first carries out conventional gas production in 2 hours work, starts ground gas-heating apparatus after gas production is normal, and the natural gas temperature of the heating gas outlet day after tomorrow 11 controls at about 120 degree；
5th step, the high-temperature natural gas that after heating, gas outlet 11 flows out from the gas-heating apparatus of ground injects the annular space between tubing string 1 and tubing string 2 by the interior pipe four-way on the concentric double pipe stratified injection water well head of ground, this high-temperature natural gas returns in tubing string 1 through high-temperature gas tap 4, high-temperature gas tap 4 is positioned at underground throttle device upper end of nozzle, the natural gas flow of stratum output just produces negative pressuren zone after underground throttle device nozzle, the high-temperature natural gas after the heating of the ground negative pressure at high-temperature gas tap 4 place just easily flows in tubing string 1 without external pressure under driving, and mix with the natural gas of stratum output and to return to ground through tubing string 1.
After above-mentioned heating, gas outlet 11 is provided with piezometer.
Above-mentioned ground gas-heating apparatus energy horizontal positioned, or vertically place.
Above-mentioned need heated natural gas coil pipe 12 for copper pipe.
Concentric tube heat tracing gas injection gas producing technology tubing string is made up of tubing string 1, tubing string 2, casing string 3, connection pipe nipple 5, underground throttle device main body 6, underground throttle device nozzle 7, underground throttle device supporter 8, supporter 9, above-mentioned tubing string 2 is placed in casing string 3, and tubing string 2 is threadeded with supporter 9 by coupling pipe nipple 5；Above-mentioned tubing string 1 is placed in tubing string 2, tubing string 1 is threadeded with underground throttle device supporter 8, underground throttle device nozzle 7 is embedded in underground throttle device main body 6 lower end inside and threaded, underground throttle device main body 6 is supported by underground throttle device supporter 8, underground throttle device main body 6 and underground throttle device supporter 8 sidewall arrange high-temperature gas tap 4, and tubing string 1 is supported by the supporter 9 of tubing string 2 lower end.
Concentric tube heat tracing natural gas exploiting method of the present invention, compared with the method that taps natural gas with existing conventional underground throttle device, adds natural gas heat tracing flow process (only once input), eliminates the problem getting rid of shaft bottom hydrops continually；Decrease workover treatment intensity, improve rate during gas well liquid loading, be effectively protected gas-bearing formation, reduce gas production cost.
Accompanying drawing explanation
Fig. 1 is concentric tube heat tracing gas injection gas producing technology tubing string schematic diagram；
Fig. 2 is ground gas-heating apparatus schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The processing step of concentric tube heat tracing natural gas exploiting method of the present invention is as follows:
The first step, assemble and under enter concentric tube heat tracing gas injection gas producing technology tubing string.As shown in Figure 1, this concentric tube heat tracing gas injection gas producing technology tubing string is made up of tubing string 1, tubing string 2, casing string 3, connection pipe nipple 5, underground throttle device main body 6, underground throttle device nozzle 7, underground throttle device supporter 8 and supporter 9, above-mentioned tubing string 2 is placed in casing string 3, and tubing string 2 is threadeded with supporter 9 by coupling pipe nipple 5；Above-mentioned tubing string 1 is placed in tubing string 2, tubing string 1 is threadeded with underground throttle device supporter 8, underground throttle device nozzle 7 is embedded in underground throttle device main body 6 lower end inside and threaded, underground throttle device main body 6 is supported by underground throttle device supporter 8, underground throttle device main body 6 and underground throttle device supporter 8 sidewall arrange high-temperature gas tap 4, and tubing string 1 is supported by the supporter 9 of tubing string 2 lower end；
Second step, installs gas production wellhead.Casing flange pipe nipple on concentric double pipe stratified injection water well head is threadeded with casing string 3, threaded with tubing string 2 in outer tube tubing hanger lower end in big four on concentric double pipe stratified injection water well head, threadeding with tubing string 1 in the interior pipe tubing hanger lower end of the interior pipe four-way lower end on concentric double pipe stratified injection water well head, and carries out pressure testing by the pressure testing standard of gas production wellhead；
3rd step, installs ground gas-heating apparatus.As in figure 2 it is shown, ground gas-heating apparatus is by needing pipe 16 in heated natural gas coil pipe 12, heating jacket 13 and heating to form.nullHeated natural gas coil pipe 12 is needed to be set to helical form，Heated natural gas coil pipe 12 is needed to be arranged in heating jacket 13，Heating jacket 13 two ends are welded and fixed with needing heated natural gas coil pipe 12，Natural gas entrance 14 need to be heated threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground，The heating gas outlet day after tomorrow 11 is threadeded with the outer tube four-way gate valve on the concentric double pipe stratified injection water well head of ground，In heating, pipe 16 is positioned at heating jacket center，In heating, pipe 16 two ends and heating jacket 13 are welded and fixed，In heating, threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground in burning gas entrance 15 one end of pipe 16，In heating, the other end burning use gas of pipe 16 exports 17 and atmosphere，After heating, gas outlet 11 pipeline is provided with thermometer；
4th step, first carries out conventional gas production in 2 hours work, starts ground gas-heating apparatus after gas production is normal, and the natural gas temperature of the heating gas outlet day after tomorrow 11 controls at about 120 degree；
5th step, the high-temperature natural gas that after heating, gas outlet 11 flows out from the gas-heating apparatus of ground injects the annular space between tubing string 1 and tubing string 2 by the interior pipe four-way on the concentric double pipe stratified injection water well head of ground, this high-temperature natural gas returns in tubing string 1 through high-temperature gas tap 4, high-temperature gas tap 4 is positioned at underground throttle device upper end of nozzle, the natural gas flow of stratum output just produces negative pressuren zone after underground throttle device nozzle, the high-temperature natural gas after the heating of the ground negative pressure at high-temperature gas tap 4 place just easily flows in tubing string 1 without external pressure under driving, and mix with the natural gas of stratum output and to return to ground through tubing string 1.The natural gas of the stratum output in tubing string 1 is mainly heated and is incubated by the process that high-temperature natural gas flows downward at the annular space of tubing string 1 with tubing string 2, it is ensured that will not because temperature drop produce drop and then produces shaft bottom hydrops phenomenon when the natural gas of stratum output flows up in tubing string 1.
After above-mentioned heating, gas outlet 11 is provided with piezometer.
Above-mentioned ground gas-heating apparatus energy horizontal positioned, or vertically place.
Above-mentioned need heated natural gas coil pipe 12 for copper pipe.
Concentric tube heat tracing natural gas exploiting method of the present invention is implemented:
First assemble and under enter concentric tube heat tracing gas injection gas producing technology tubing string；Gas production wellhead (replacing with concentric double pipe stratified injection water well head) is then installed；Then ground gas-heating apparatus is installed.
First, assemble and under when entering concentric tube heat tracing gas injection gas producing technology tubing string, enter first down tubing string 2(wherein casing string 3 and enter down in advance with completion tubular column), then enter down tubing string 1, tubing string 2 is placed in casing string 3, and tubing string 2 is threadeded with supporter 9 by coupling pipe nipple 5；Above-mentioned tubing string 1 is placed in tubing string 2, tubing string 1 is threadeded with underground throttle device supporter 8, underground throttle device nozzle 7 is embedded in underground throttle device main body 6 lower end inside and threaded, underground throttle device main body 6 is supported by underground throttle device supporter 8, underground throttle device main body 6 and underground throttle device supporter 8 sidewall arrange high-temperature gas tap 4, and tubing string 1 is supported by the supporter 9 of tubing string 2 lower end；Under enter in tubing string 2 process with tubing string 1, control corresponding kit internal-and external diameter as far as possible identical with tubing string internal-and external diameter, flow frictional resistance reducing gas to greatest extent.
Gas production wellhead is installed again.Concentric double pipe stratified injection water well head must be used during installation to replace gas production wellhead, because this kind of concentric tube more conventional natural gas exploiting method of heat tracing natural gas exploiting method adds natural gas heat tracing passage in pit shaft, and concentric double pipe stratified injection water well head just can realize concentric tube heat tracing function.Wherein the casing flange pipe nipple on concentric double pipe stratified injection water well head and casing string 3 can be directly threaded or be connected by dialectal switching joint screw thread, threadeding with tubing string 2 in outer tube tubing hanger lower end in big four on concentric double pipe stratified injection water well head, threadeds with tubing string 1 in the interior pipe tubing hanger lower end of the interior pipe four-way lower end on concentric double pipe stratified injection water well head；
Before ground gas-heating apparatus is installed, first by the pressure testing standard of gas production wellhead, concentric double pipe stratified injection water well head is carried out pressure testing, ground gas-heating apparatus can be installed after pressure testing is qualified.nullGround gas-heating apparatus need heated natural gas coil pipe 12 be arranged in heating jacket 13，Heating jacket 13 two ends are welded and fixed with needing heated natural gas coil pipe 12，Natural gas entrance 14 need to be heated threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground，The heating gas outlet day after tomorrow 11 is threadeded with the outer tube four-way gate valve on the concentric double pipe stratified injection water well head of ground，In heating, pipe 16 is positioned at heating jacket center，In heating, pipe 16 two ends and heating jacket 13 are welded and fixed，In heating, threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground in burning gas entrance 15 one end of pipe 16，In heating, the other end burning use gas of pipe 16 exports 17 and atmosphere，Ground gas-heating apparatus can select different connected modes according to on-the-spot flow conditions from the connection of ground concentric double pipe stratified injection water well head，If the height of gas production wellhead is unrestricted，Ground gas-heating apparatus can be placed on the top of gas production wellhead，If gas production wellhead is height-limited，So ground gas-heating apparatus can be placed on the side (horizontal positioned) of gas production wellhead，Heated natural gas coil pipe 12 in the gas-heating apparatus of ground can be copper pipe、Aluminium-alloy pipe or iron pipe，But consider that radiating effect and life-span select copper pipe as far as possible.Needing heated natural gas coil pipe 12 to be set to helical form, its pitch does not have particular/special requirement, as long as internal diameter is indeformable when ensureing to need heated natural gas coil pipe 12 helical buckling.Heating jacket 13 can use major diameter sleeve pipe to make, it is also possible to rolls with the steel plate of 5 millimeters thick and is welded.If the outer tube four-way on the concentric double pipe stratified injection water well head of ground is provided with thermometer and piezometer, then after heating, gas outlet 11 pipeline need not install thermometer and piezometer again.
After completing to enter under concentric tube heat tracing gas injection gas producing technology tubing string, install gas production wellhead (replacing with concentric double pipe stratified injection water well head) and installing ground gas-heating apparatus, just the conventional gas production work of certain time can be started, the time of conventional gas production work can adjust flexibly according to the height of gas well yield, when gas well yield is higher, the conventional gas production time can be shorter, when gas well yield is relatively low, the conventional gas production time can be grown, and is typically between 1-5 hour and adjusts.Starting ground gas-heating apparatus after gas production is normal, the natural gas temperature of the heating gas outlet day after tomorrow 11 controls in 110-120 degree scope.
After completing the aforementioned steps, the high-temperature natural gas that after heating, gas outlet 11 flows out from the gas-heating apparatus of ground injects the annular space between tubing string 1 and tubing string 2 by the interior pipe four-way on the concentric double pipe stratified injection water well head of ground, this high-temperature natural gas returns in tubing string 1 through high-temperature gas tap 4, and mixes with the natural gas of stratum output and return to ground through tubing string 1.The natural gas of the stratum output in tubing string 1 is mainly heated and is incubated by the process that high-temperature natural gas flows downward at the annular space of tubing string 1 with tubing string 2, it is ensured that will not because temperature drop produce drop and then produces shaft bottom hydrops phenomenon when the natural gas of stratum output flows up in tubing string 1.
Claims (4)
1. a concentric tube heat tracing natural gas exploiting method, is characterized in that the method comprises the steps:
The first step, assemble and under enter concentric tube heat tracing gas injection gas producing technology tubing string: this concentric tube heat tracing gas injection gas producing technology tubing string by the first tubing string (1), the second tubing string (2), casing string (3), couple pipe nipple (5), underground throttle device main body (6), underground throttle device nozzle (7), underground throttle device the first supporter (8) and the second supporter (9) form, described second tubing string (2) is placed in casing string (3), and the second tubing string (2) is threadeded with the second supporter (9) by coupling pipe nipple (5)；Described first tubing string (1) is placed in the second tubing string (2), first tubing string (1) is threadeded with underground throttle device the first supporter (8), underground throttle device nozzle (7) is embedded in underground throttle device main body (6) lower end inside and threaded, underground throttle device main body (6) is supported by underground throttle device the first supporter (8), underground throttle device main body (6) and underground throttle device the first supporter (8) sidewall arrange high-temperature gas tap (4), first tubing string (1) is supported by second supporter (9) of the second tubing string (2) lower end；
Second step, gas production wellhead is installed: the casing flange pipe nipple on concentric double pipe stratified injection water well head is threadeded with casing string (3), threaded with the second tubing string (2) in outer tube tubing hanger lower end in big four on concentric double pipe stratified injection water well head, threadeding with the first tubing string (1) in the interior pipe tubing hanger lower end of the interior pipe four-way lower end on concentric double pipe stratified injection water well head, and carries out pressure testing by the pressure testing standard of gas production wellhead；
null3rd step，Ground gas-heating apparatus is installed: this ground gas-heating apparatus is by needing heated natural gas coil pipe (12)、Pipe (16) composition in heating jacket (13) and heating，Heated natural gas coil pipe (12) is needed to be set to helical form，Heated natural gas coil pipe (12) is needed to be arranged in heating jacket (13)，Heating jacket (13) two ends are welded and fixed with needing heated natural gas coil pipe (12)，Heated natural gas entrance (14) is needed to threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground，After heating, gas outlet (11) is threadeded with the outer tube four-way gate valve on the concentric double pipe stratified injection water well head of ground，In heating, pipe (16) is positioned at heating jacket center，In heating, pipe (16) two ends are welded and fixed with heating jacket (13)，In heating, threaded with the interior sluice valve on the interior pipe four-way on the concentric double pipe stratified injection water well head of ground in burning gas entrance (15) one end of pipe (16)，The other end burning use gas outlet (17) and the atmosphere of pipe (16) in heating，After heating, gas outlet (11) pipeline is provided with thermometer；
4th step, first carries out conventional gas production in 2 hours work, starts ground gas-heating apparatus after gas production is normal, and after heating, the natural gas temperature of gas outlet (11) controls at about 120 degree；
5th step, the high-temperature natural gas that after heating, gas outlet (11) flows out from the gas-heating apparatus of ground injects the annular space between the first tubing string (1) and the second tubing string (2) by the interior pipe four-way on the concentric double pipe stratified injection water well head of ground, this high-temperature natural gas returns in the first tubing string (1) through high-temperature gas tap (4), high-temperature gas tap (4) is positioned at underground throttle device upper end of nozzle, the natural gas flow of stratum output just produces negative pressuren zone after underground throttle device nozzle, the high-temperature natural gas after the heating of the ground negative pressure at high-temperature gas tap (4) place just easily flows in the first tubing string (1) without external pressure under driving, and mix with the natural gas of stratum output and to return to ground through the first tubing string (1).
2. concentric tube heat tracing natural gas exploiting method according to claim 1, is characterized in that: after described heating, gas outlet (11) is provided with piezometer.
3. concentric tube heat tracing natural gas exploiting method according to claim 1, is characterized in that: described ground gas-heating apparatus energy horizontal positioned, or vertically places.
4. concentric tube heat tracing natural gas exploiting method according to claim 1, is characterized in that: described to need heated natural gas coil pipe (12) be copper pipe.
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| CN201310035986.1A CN103967464B (en) | 2013-01-30 | 2013-01-30 | Concentric pipe heat tracing natural gas exploitation method and special pipe column |
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| CN106481312A (en) * | 2016-12-20 | 2017-03-08 | 西安迈克斯石油技术有限公司 | Producing well wax-proofing apparatus and its system |
| CN110863826B (en) * | 2019-11-18 | 2023-03-14 | 中海石油气电集团有限责任公司 | Method for determining discharge and mining technological parameters of concentric tube jet pump and application |
| CN111119790B (en) * | 2019-12-12 | 2021-11-05 | 中国石油化工股份有限公司 | Equal-dryness separate injection valve for segmented steam injection of thermal recovery horizontal well |
| CN111119811A (en) * | 2019-12-25 | 2020-05-08 | 中国石油天然气股份有限公司 | Dual-medium dispenser, dispensing string, and method for operating dispensing string |
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