CN103573235A - Immovable string acidizing pressure-reducing injection-increasing process method for water injection well - Google Patents
Immovable string acidizing pressure-reducing injection-increasing process method for water injection well Download PDFInfo
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- CN103573235A CN103573235A CN201310531337.0A CN201310531337A CN103573235A CN 103573235 A CN103573235 A CN 103573235A CN 201310531337 A CN201310531337 A CN 201310531337A CN 103573235 A CN103573235 A CN 103573235A
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- water injection
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- injection well
- acidifying
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 239000007924 injection Substances 0.000 title claims abstract description 128
- 238000002347 injection Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000243 solution Substances 0.000 claims abstract description 56
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 10
- 230000007797 corrosion Effects 0.000 claims abstract description 10
- 238000005260 corrosion Methods 0.000 claims abstract description 10
- 239000003381 stabilizer Substances 0.000 claims abstract description 8
- 239000012153 distilled water Substances 0.000 claims abstract description 5
- 230000003190 augmentative effect Effects 0.000 claims description 23
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 14
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 12
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 10
- -1 alcohol ether carboxylate Chemical class 0.000 claims description 9
- YWMWZKYVGNWJPU-UHFFFAOYSA-N [bis[6-[bis(phosphonomethyl)amino]hexyl]amino]methylphosphonic acid Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCCCCCN(CP(O)(=O)O)CCCCCCN(CP(O)(O)=O)CP(O)(O)=O YWMWZKYVGNWJPU-UHFFFAOYSA-N 0.000 claims description 7
- 229960005070 ascorbic acid Drugs 0.000 claims description 7
- 235000010323 ascorbic acid Nutrition 0.000 claims description 7
- 239000011668 ascorbic acid Substances 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 229960005137 succinic acid Drugs 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 3
- 230000020477 pH reduction Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract 2
- 239000002131 composite material Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 239000002360 explosive Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- CCVYRRGZDBSHFU-UHFFFAOYSA-N (2-hydroxyphenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC=C1O CCVYRRGZDBSHFU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention discloses a fixed tubular column acidification pressure reduction and injection increase process method for a water injection well, which comprises the following steps: a. mixing 0.3-3 parts of weak acid acidizing fluid and 99.7-97 parts of injected water in a volume ratio; b. injecting the mixed liquid into a water inlet pipeline in a drip injection mode; c. stopping injecting the mixed liquid when the set injection allocation amount is reached and the pressure of the water injection well is reduced to 90% of the pressure of water injection before construction; the weak acid acidification solution is as follows: the composite material comprises the following components in percentage by weight: acid liquor: 10-30%; a stabilizer: 2-8%; corrosion inhibitor: 1-5%; surfactant : 6.5-17%; the balance of distilled water. The method expands the acidification blockage removal radius of the water injection well, relieves the scaling near the shaft of the water injection well and prolongs the effective period of the water injection well; continuous mixing and acidification of the fixed pipe column are realized, and the construction process is simplified; the water injection acidification is synchronously carried out without influencing the normal production of the water well.
Description
Technical field
The present invention relates to water injection well step-down augmented injection process method and technology field, particularly relate to a kind of low permeability oil field sandstone oil reservoir water injection well acidifying step-down augmented injection that makes, acidification to dispel block radius is large, period of validity increases, be mixed continuously acidifying and water filling of fixed tubular column synchronously carried out, and do not affect the step-down augmented injection process method of normal production.
Background technology
In the process of LOW PERMEABILITY OILFIELD DEVELOPMENT, with the decay of stratum energy, pass through waterflood enhanced recovery at present, for example publication number is CN202250005U, the Chinese patent literature that open day is on May 30th, 2012 discloses a kind of water injection well step-down augmented injection device, be applied to water injection well in oil fields, in water injection well, inject surfactant.Between water injection well distributing room for water injection and wellhead of water injection well, there is high pressure water injection pipeline; The entrance of explosive box is fixed with pipeline, is in series with successively a low pressure valve, an electrodynamic pump and a valve on pipeline, can step-down augmented injection medicament be injected in explosive box by electrodynamic pump.Outlet at explosive box is connected with tapping line, is connected with gate valve, driven high voltage ratio dosing pump and ball-and-seat on tapping line in turn, and the other end of tapping line is communicated with high pressure water injection pipeline.Effect is: can continuously to water injection well, inject step-down augmented injection medicament by a certain percentage, can reduce the injection pressure of wellhead of water injection well; Can adjust the injection rate of driven high voltage ratio dosing pump simultaneously.
But in water injection well manufacturing process, due to being incompatible of injected water and formation water, can be in the slow fouling of water injection well pit shaft and near wellbore zone, cause that injection pressure progressively raises, injection allocation amount reduces, and finally change water injection well high pressure into and short, and corresponding oil well energy is not enough.
Water injection well is implemented acidifying measure need to stop water filling successively, and tubing string is changed in pressure release, plays lower tubular column, acid filling, and closing well, the row of returning, plays lower tubular column, 7～14 days consuming time.Corresponding well group oil well output successively decreases obviously during this period, therefore for the series of problems of current low permeability oil field sandstone oil reservoir water injection well acidizing treatment, be necessary to research and develop a kind of fixed tubular column acidifying step-down augmented injection process method for water injection well, make water injection well implement the acidifying measure normal water filling of water injection well simultaneously, keep corresponding oil-well strata pressure, step-down augmented injection and water filling are synchronously carried out.
Summary of the invention
The present invention is intended to for the existing defect of above-mentioned prior art and deficiency, a kind of fixed tubular column acidifying step-down augmented injection process method for water injection well is provided, this method has expanded water injection well acidification to dispel block radius, has alleviated near the fouling of water injection well pit shaft, has extended water injection well period of validity; Realize the fixed tubular column acidifying that is mixed continuously, simplified working procedure; Water filling acidifying does not synchronously affect well and normally produces.
The present invention is by adopting following technical proposals to realize:
By a fixed tubular column acidifying step-down augmented injection process method, it is characterized in that step is as follows:
A, in volume ratio, get 0.3～3 part of faint sour acidifying solution and mix with 99.7～97 parts of injected waters;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach the injection allocation amount of setting and water injection well pressure decreased to water injection pressure before construction 90% time, stop injecting mixed liquor;
Described faint sour acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizing agent: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water.
After c step, also has d step: back with water inlet line is adjusted into normal water filling state.
Described back with water inlet line is water injection well six drifting mouths.
In described a step and b step, by faint sour acidifying solution skid-mounted device, faint sour acidifying solution and the mixed merga pass drop injection mode of injected water are injected in back with water inlet line.
Described faint sour acidifying solution skid-mounted device is to embody the high-pressure plunger pump (EATON-VICKERS Eton Vickers PFB5 plunger displacement pump) that ball-and-seat performance is master.
Consisting of of described acid solution: A component: butanedioic acid; Any combination of one or more in B component: PBTCA, HPAA, BHMTPMPA or HDTMPA; With the weight percent meter in acidifying solution, A component accounts for 5 ~ 10%, B component and accounts for 5 ~ 20%.
Described stabilizing agent is comprised of citric acid and ascorbic acid, and with the weight percent meter in acidifying solution, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%.
Described corrosion inhibiter is propilolic alcohol.
Described surfactant is comprised of alcohol ether carboxylate, OPEO and fluorocarbon surfactant, with the weight percent meter in acidifying solution, alcohol ether carboxylate percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, and fluorocarbon surfactant percentage by weight is 0.5 ~ 2%.
The SR18Y fluorocarbon surfactant that described fluorocarbon surfactant can select Shaanxi Sen Rui Science and Technology Ltd. to produce.·
Described PBTCA is 2-phosphate-1; 2; 4-butane tricarboxylate; described HPAA is 2-HPAA; described BHMTPMPA is two 1; 6-hexylidene triamine five methylenephosphonic acids, described HDTMPA is hexamethylene diamine four methylenephosphonic acids, the product that all can adopt Shandong calm and peaceful water treatment Co., Ltd to produce.
Compared with prior art, beneficial effect of the present invention shows:
One, adopt tri-steps of abc of the present invention to carry out fixed tubular column acidifying step-down augmented injection process, expanded water injection well acidification to dispel block radius, alleviate near the fouling of water injection well pit shaft, extend water injection well period of validity; Realize the fixed tubular column acidifying that is mixed continuously, simplified working procedure; Water filling acidifying does not synchronously affect well and normally produces.And be in particular in:
1, reduce tubing string in fracturing work process and removed number of times, simplified working procedure, saved construction operation cost;
2, reduced operation consuming time during corresponding oil-well strata energy successively decrease;
3, acidifying solution adopts point to be instilled into water injection well to make water filling acidifying synchronously not affect well normally to produce.
Two,, in this process, specifically select " acid solution: 10 ~ 30%; Stabilizing agent: 2 ~ 8%; Corrosion inhibiter: 1 ~ 5%; Surfactant: 6.5 ~ 17%; Surplus is distilled water " the such proportioning of special ratios, the water injection well of formation has good surface and interface tension force and rock core displacement performance with the faint sour acidifying solution of fixed tubular column, has certain inhibition and corrosion performance.
Three, this technique has realized the nearly pit shaft of oil field sandstone oil reservoir injection well (0m ~ 3m) fouling and has stopped up releasing, also can remove pit shaft 3m ~ 30m fouling simultaneously and stop up, and expands water injection well acidification to dispel block radius, alleviates near the fouling of water injection well pit shaft, extends water injection well period of validity; Realize the fixed tubular column acidifying that is mixed continuously, simplified working procedure; Water filling acidifying does not synchronously affect well and normally produces; Water injection well is played to de-plugging step-down augmented injection object.
Four, one or several in butanedioic acid of the present invention and (PBTCA, HPAA, BHMTPMPA, HDTMPA) can slowly dissolve deep fouling obstruction, and can delay reservoir secondary fouling obstruction, delay water injection well pressure fast rise; Citric acid and ascorbic acid energy chelating acid solution produce metal ion to reservoir rock, obstruction dirt and oil pipe corrosion, suppress acid sludge and produce; Fluorocarbon surfactant can reduce faint sour acidifying solution diagram of system surface tension; Alcohol ether carboxylate (AEC-9), OPEO and fluorocarbon surfactant can reduce faint sour acidifying solution energy interfacial tension under synergy.
The specific embodiment
Embodiment 1
As preferred forms of the present invention, the invention discloses a kind of fixed tubular column acidifying step-down augmented injection process method for water injection well, its step is as follows:
A, in volume ratio, get 0.3～3 part of faint sour acidifying solution and mix with 99.7～97 parts of injected waters;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach the injection allocation amount of setting and water injection well pressure decreased to water injection pressure before construction 90% time, stop injecting mixed liquor;
Described faint sour acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizing agent: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water.
Described acid solution is one or several in butanedioic acid and (PBTCA, HPAA, BHMTPMPA, HDTMPA), wherein, butanedioic acid percentage by weight is 5 ~ 10%, one or several weight summation percentages in (PBTCA, HPAA, BHMTPMPA, HDTMPA) are 5 ~ 20%, and (PBTCA, HPAA, BHMTPMPA, HDTMPA) is Shandong calm and peaceful water treatment Co., Ltd and produces.Described stabilizing agent is citric acid and ascorbic acid, and wherein, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%.Described corrosion inhibiter is that its percentage by weight of propilolic alcohol is 1 ~ 5%.Described surfactant is alcohol ether carboxylate (AEC-9), OPEO and fluorocarbon surfactant, wherein, alcohol ether carboxylate (AEC-9) percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, fluorocarbon surfactant percentage by weight is 0.5 ~ 2%, and fluorocarbon surfactant is the SR18Y fluorocarbon surfactant that Shaanxi Sen Rui Science and Technology Ltd. produces.
Certainly, in this example, can also adopt other faint sour acidifying solutions of the prior art.
Embodiment 2-on-the-spot application example of the present invention
The first step: fixed tubular column acidifying solution material and corollary equipment are carried to on-the-spot corresponding water injection well assigned address;
Second step: add fixed tubular column acidifying solution material in faint sour acidifying solution skid-mounted device;
The 3rd step: to water injection well closing well 0.5 hour, then open wellhead of water injection well anti-flushing well gate and carry out anti-flushing well, the well-flushing water yield arrives a well hold after after closes all gates of all water injection well six drifting mouths.
The 4th step: faint sour acidifying solution skid-mounted device is connected to and is injected in water injection well six drifting mouths (back with water inlet line).
The 5th step: the logical head valve of water injection well six is adjusted into normal water filling state.
The 6th step: open faint sour acidifying solution skid-mounted device switch, adjust faint sour acidifying solution skid-mounted device switch ratio, make faint sour acidifying solution by faint sour acidifying solution skid-mounted device, with injected water, adopt drop mode to inject in water injection well six drifting mouths (back with water inlet line) with 3%.
The 7th step: water injection well is total to water filling number of days 62 days, water filling every day 30m in construction period
3/ day, inject faint sour acidifying solution 1860m
3, water injection well reach injection allocation amount water injection well pressure decreased to water injection pressure before construction 90% time, stop noting faint sour acidifying solution skid-mounted device and faint sour acidifying solution;
The 8th step: by all valve closings of water injection well six drifting mouth, remove faint sour acidifying solution skid-mounted device connector, the logical head valve of water injection well six is adjusted into normal water filling state.
Embodiment 3-another on-the-spot application example of the present invention
The first step: fixed tubular column acidifying solution material and corollary equipment are carried to on-the-spot corresponding water injection well assigned address;
Second step: to water injection well closing well 0.5 hour, with 350 type well-washing truck water injection well anti-flushing wells, the well-flushing water yield arrives a well hold after after closes all gates of all water injection well six drifting mouths.
The 3rd step: add fixed tubular column acidifying solution material in faint sour acidifying solution skid-mounted device, faint sour acidifying solution skid-mounted device is connected to and is injected in water injection well six drifting mouths (back with water inlet line).
The 4th step: the logical head valve of water injection well six is adjusted into normal water filling state.
The 5th step: open faint sour acidifying solution skid-mounted device switch, adjust faint sour acidifying solution skid-mounted device switch ratio, make faint sour acidifying solution by faint sour acidifying solution skid-mounted device, with injected water, adopt drop mode to inject in water injection well six drifting mouths (back with water inlet line) with 0.3%.
The 6th step: water injection well is total to water filling number of days 88 days, water filling every day 25m in construction period
3/ day, inject faint sour acidifying solution 2200m
3, water injection well arrive water injection pressure before injection allocation amount the construction of water injection well pressure decreased 90% time, stop noting faint sour acidifying solution skid-mounted device and faint sour acidifying solution;
The 7th step: by all valve closings of water injection well six drifting mouth, remove faint sour acidifying solution skid-mounted device connector, the logical head valve of water injection well six is adjusted into normal water filling state.
Claims (9)
1. a fixed tubular column acidifying step-down augmented injection process method for water injection well, is characterized in that step is as follows:
A, in volume ratio, get 0.3～3 part of faint sour acidifying solution and mix with 99.7～97 parts of injected waters;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach the injection allocation amount of setting and water injection well pressure decreased to water injection pressure before construction 90% time, stop injecting mixed liquor;
Described faint sour acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizing agent: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water.
2. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1, is characterized in that: after c step, also have d step: back with water inlet line is adjusted into normal water filling state.
3. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1 and 2, is characterized in that: described back with water inlet line is water injection well six drifting mouths.
4. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 3, is characterized in that: in described a step and b step, by faint sour acidifying solution skid-mounted device, faint sour acidifying solution and the mixed merga pass drop injection mode of injected water are injected in back with water inlet line.
5. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 4, is characterized in that: described faint sour acidifying solution skid-mounted device is to embody the high-pressure plunger pump that ball-and-seat performance is master.
6. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1, is characterized in that: the consisting of of described acid solution: A component: butanedioic acid; Any combination of one or more in B component: PBTCA, HPAA, BHMTPMPA or HDTMPA; With the weight percent meter in acidifying solution, A component accounts for 5 ~ 10%, B component and accounts for 5 ~ 20%.
7. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1, is characterized in that: described stabilizing agent is comprised of citric acid and ascorbic acid, and with the weight percent meter in acidifying solution, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%.
8. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1, is characterized in that: described corrosion inhibiter is propilolic alcohol.
9. fixed tubular column acidifying step-down augmented injection process method for water injection well according to claim 1, it is characterized in that: described surfactant is comprised of alcohol ether carboxylate, OPEO and fluorocarbon surfactant, with the weight percent meter in acidifying solution, alcohol ether carboxylate percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, and fluorocarbon surfactant percentage by weight is 0.5 ~ 2%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105735962A (en) * | 2016-01-30 | 2016-07-06 | 山东省鲁南地质工程勘察院 | Paleozoic carbonate heat storage reservoir chemical fracturing well flushing technique |
| CN105952431A (en) * | 2016-04-21 | 2016-09-21 | 中国石油天然气股份有限公司 | Method for removing blockage by immobile pipe column |
| CN108775236A (en) * | 2018-08-15 | 2018-11-09 | 宁夏朔光石油科技有限公司 | The increasing injection process of water injection well and its application |
| CN110410048A (en) * | 2019-07-02 | 2019-11-05 | 中国石油天然气股份有限公司 | Method for prolonging acidification validity period |
| CN110700804A (en) * | 2019-10-09 | 2020-01-17 | 中国石油天然气股份有限公司 | Method for adding antihypertensive and augmented injection medicament |
| CN111502598A (en) * | 2019-01-31 | 2020-08-07 | 中国石油天然气股份有限公司 | Acidification blockage removing method |
| CN114856514A (en) * | 2021-02-03 | 2022-08-05 | 中国石油天然气股份有限公司 | Water injection device and method for water injection well |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735962A (en) * | 2016-01-30 | 2016-07-06 | 山东省鲁南地质工程勘察院 | Paleozoic carbonate heat storage reservoir chemical fracturing well flushing technique |
| CN105952431A (en) * | 2016-04-21 | 2016-09-21 | 中国石油天然气股份有限公司 | Method for removing blockage by immobile pipe column |
| CN105952431B (en) * | 2016-04-21 | 2018-08-10 | 中国石油天然气股份有限公司 | Method for removing blockage by immobile pipe column |
| CN108775236A (en) * | 2018-08-15 | 2018-11-09 | 宁夏朔光石油科技有限公司 | The increasing injection process of water injection well and its application |
| CN108775236B (en) * | 2018-08-15 | 2020-06-26 | 宁夏朔光石油科技有限公司 | Pressure-reducing and injection-increasing process method for water injection well and application thereof |
| CN111502598A (en) * | 2019-01-31 | 2020-08-07 | 中国石油天然气股份有限公司 | Acidification blockage removing method |
| CN110410048A (en) * | 2019-07-02 | 2019-11-05 | 中国石油天然气股份有限公司 | Method for prolonging acidification validity period |
| CN110410048B (en) * | 2019-07-02 | 2022-03-29 | 中国石油天然气股份有限公司 | Method for prolonging acidification validity period |
| CN110700804A (en) * | 2019-10-09 | 2020-01-17 | 中国石油天然气股份有限公司 | Method for adding antihypertensive and augmented injection medicament |
| CN110700804B (en) * | 2019-10-09 | 2022-01-04 | 中国石油天然气股份有限公司 | Method for adding antihypertensive and augmented injection medicament |
| CN114856514A (en) * | 2021-02-03 | 2022-08-05 | 中国石油天然气股份有限公司 | Water injection device and method for water injection well |
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