CN101531889A - Oil-based stuck freeing fluid for well drilling - Google Patents
Oil-based stuck freeing fluid for well drilling Download PDFInfo
- Publication number
- CN101531889A CN101531889A CN200910058919A CN200910058919A CN101531889A CN 101531889 A CN101531889 A CN 101531889A CN 200910058919 A CN200910058919 A CN 200910058919A CN 200910058919 A CN200910058919 A CN 200910058919A CN 101531889 A CN101531889 A CN 101531889A
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- Prior art keywords
- oil
- agent
- fluid
- stuck freeing
- technical grade
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- 239000012530 fluid Substances 0.000 title claims abstract description 34
- 238000005553 drilling Methods 0.000 title claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002283 diesel fuel Substances 0.000 claims abstract description 15
- 239000000292 calcium oxide Substances 0.000 claims abstract description 13
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 13
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims description 15
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 13
- 229910052601 baryte Inorganic materials 0.000 claims description 9
- 239000010428 baryte Substances 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 claims description 3
- 229940063655 aluminum stearate Drugs 0.000 claims description 3
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 229940074404 sodium succinate Drugs 0.000 claims description 3
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 238000004945 emulsification Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- -1 polyoxyethylene nonylphenol Polymers 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- RNMDNPCBIKJCQP-UHFFFAOYSA-N 5-nonyl-7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-ol Chemical compound C(CCCCCCCC)C1=C2C(=C(C=C1)O)O2 RNMDNPCBIKJCQP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an oil-based stuck freeing fluid for well drilling, which is characterized by being prepared by mixing the following components in percentage by weight: 4 to 5 percent of organic soil, 1 to 1.5 percent of main emulsifier, 0.5 to 1 percent of auxiliary emulsifier, 4 to 5 percent of anti-sticking agent, 5 to 6 percent of quicklime, and the balance of diesel oil and rapid penetrant. The invention overcomes the defects of long soaking time and low stuck freeing efficiency of the conventional and foreign conventional oil-based stuck freeing liquid, and can quickly and effectively eliminate the drill stuck accidents caused by pressure difference during drilling.
Description
Technical field
The present invention relates to the petroleum drilling technology field, exactly relate to the oil-based stuck freeing fluid that drilling well is used.
Background technology
Continuous expansion along with Exploration Domain, the quantity of special wells such as ultra deep well, long horizontal traverse well, horizontal well sharply increases, be subjected to the restriction of various factors during drilling well is produced, cause the outwardness of same bore hole section High Pressure Difference, the accident that pressure reduction adheres to bit freezing frequently takes place.
In creeping into, in case taking place, pressure reduction adheres to bit freezing, releasing method commonly used is to soak the oil base releasing stuck agent, but the oil base releasing stuck agent of domestic tradition and import often could play the unfreezing effect more than a few hours after going into well, that have even do not play the unfreezing effect, long and the unfreezing efficient very low (generally 30～50%) of its soak time, often occur causing other serious accident because of soak time length, scrap etc. as sidetracking, well, waste a large amount of manpowers and material resources for this reason, had a strong impact on the progress of exploratory development.
Publication number is CN101328402, and the Chinese invention patent document that open day is on December 24th, 2008 discloses a kind of oil well blockage removing pipe free agent, is applied to oilfield and removes the card well accident that causes because of dirt deposition.Feature is: each components by weight is: a. polyoxyethylene nonylphenol ether NPD-100:5.5～8%; B. polyoxyethylene nonylphenol ether NPD-200:10～15%; C. hydrochloric acid: 2.0～3.5%; D. methyl alcohol: 20～25%; E.INTECHEM-02 fluorocarbon surfactant: 0.05～0.2%; F. all the other are water.Effect is: under the big discharge capacity of the blockage removing pipe free agent aqueous solution of application 0.5%～1% oil well is washed, remove the card well accident that causes because of dirt deposition, prolong pump detection period, reduce oil well inspection pump expense, reduced cost for oil production.But above-mentioned technology still do not have to solve " the oil base releasing stuck agent of domestic tradition and import often could play the unfreezing effect more than a few hours after going into well, have in addition do not play the unfreezing effect, its soak time grow and unfreezing efficient very low " technical problem.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of oil-based stuck freeing fluid that is applicable in the drilling well, the soak time that the present invention has overcome tradition and external existing conventional oil-based stuck freeing fluid is long, the defective of unfreezing inefficiency, and can fast and effeciently remove the pressure reduction that is taken place in creeping into and adhere to lock of tool drilling.
The present invention is achieved through the following technical solutions:
A kind of oil-based stuck freeing fluid for well drilling, it is characterized in that mixing: 4%～5% organophilic clay by the component of following weight per-cent, 1%～1.5% primary emulsion, 0.5%～1% auxilliary emulsifying agent, 4%～5% seizureproof agent, 5%～6% unslaked lime, 25%～30% quickly penetrating agent, all the other are diesel oil;
In described oil-based stuck freeing fluid, also add an amount of barite is arranged, bar consumption mainly is to satisfy in the different densities scope to use this stuck freeing spotting fluid safely, as a rule be the barite that adds by with respect to the 5%-300% of stuck freeing spotting fluid weight percent, regulate stuck freeing spotting fluid density.
Described diesel oil is common 0# diesel oil, and itself just has certain destruction to the mud cake of water-base drilling fluid, and it can also dissolving oil dissolubility solid matter and paste substance simultaneously.
Described organophilic clay is technical grade 928 types, mainly is the adjusting of rheological, also is the needs of system stability simultaneously.
Described primary emulsion is technical grade SP-80 (this benzene 80 of chemical name), and a mud cake destruction is also had in the emulsification of aggravation diesel oil and mud cake water and stratum water.
Described auxilliary emulsifying agent is technical grade ALR (aluminum stearate), is the oil soluble powder powder, has the KT foam of elimination and emulsification function, and there is certain plugging action on the stratum.
Described seizureproof agent is technical grade RLC-101, and its main component is sulfonated gilsonite, gives birth to pitch that its effect is the filter loss that reduces releasing stuck agent, simultaneously the stratum is had very strong plugging action, reduces the perviousness on stratum.
Described unslaked lime is technical grade CaO, and it is Powdered, regulates the pH value, and the free water in the absorption releasing stuck agent improves unfreezing efficient, has concurrently simultaneously and destroys mud cake and plugging action.
Described barite is the technical grade barite, and it is Powdered, is the most common mineral of barium, i.e. barium sulfate, and its composition is BaSO
4
Described quickly penetrating agent is technical grade KT (sodium succinate), and liquid also makes quickly penetrating agent be commonly called as fast T, is the major ingredient of releasing stuck agent, mainly is the effect of seepage failure mud cake.
Advantage of the present invention shows:
1, because the present invention has adopted " 4%～5% organophilic clay; 1%～1.5% primary emulsion; 0.5%～1% auxilliary emulsifying agent; 4%～5% seizureproof agent; 5%～6% unslaked lime; 25%～30% quickly penetrating agent, all the other are diesel oil " the formation oil-based stuck freeing fluid for well drilling; with existing conventional oil-based stuck freeing fluid and publication number is that the disclosed technical scheme of CN101328402 patent of invention is compared; the present invention is applied in the drilling well; it is strong to have penetrating power when handling pressure differential sticking; the mud cake dewatering speed is fast; the lubricity outstanding feature, embodies in using at the scene: soak time short (generally at 2 hours), on-the-spot preparation construction technology is simple, the advantage that the unfreezing comprehensive cost is relatively low.Successfully realized effectively removing fast the time of pressure differential sticking accident.
2, owing to also added more substantial quickly penetrating agent in the oil-based stuck freeing fluid of the present invention, the oil-based stuck freeing fluid soak time that is mixed with thus is shorter, general needs 30 minutes, overcome the long defective of soak time of tradition and external existing conventional oil-based stuck freeing fluid, and unfreezing efficient height can more fast and effeciently be removed the pressure reduction that is taken place in creeping into and adhere to lock of tool drilling.
3, behind employing the present invention, the technical indicator that can reach: stuck freeing spotting fluid density is at 1.15～2.30g/cm
3Between adjustable arbitrarily; Pressure reduction unfreezing rate 〉=80%; Site test results: the used various treatment agent costs of this stuck freeing spotting fluid are lower, ample supply of commodities on the market, and goods and materials are purchased conveniently; The on-the-spot preparation construction of this stuck freeing spotting fluid skill is simple, convenient feasible; Use this technology and successfully remove 33 wells time pressure differential sticking, soak time is about 30 minutes to 2 hours, and its unfreezing time shortens dramatically, and the unfreezing rate reaches more than 90%.
Embodiment
Embodiment 1
The invention discloses a kind of oil-based stuck freeing fluid for well drilling, mix by the component of following weight per-cent: 4% organophilic clay, 1% primary emulsion, 0.5% auxilliary emulsifying agent, 4% seizureproof agent, 5% unslaked lime, 25% quickly penetrating agent, all the other are diesel oil.After adopting such technical scheme, have when handling pressure differential sticking that penetrating power is strong, the mud cake dewatering speed is fast, the lubricity outstanding feature, embody in using at the scene: soak time short (generally at 2 hours), simple, the relatively low advantage of unfreezing comprehensive cost of on-the-spot preparation construction technology.Successfully realized effectively removing fast the time of pressure differential sticking accident.
Embodiment 2
As the present invention's one better embodiment, the component that the present invention includes by following weight per-cent mixes: 5% organophilic clay, 1.5% primary emulsion, 1% auxilliary emulsifying agent, 5% seizureproof agent, 6% unslaked lime, 30% quickly penetrating agent, all the other are diesel oil.
In drilling process, if having taken place, pressure reduction adheres to bit freezing, just can directly prepare at situ of drilling well, promptly join i.e. usefulness, particularly KT adding back pumped in the pit shaft in one hour and gets final product.
Owing to also added more substantial quickly penetrating agent in this programme, the oil-based stuck freeing fluid soak time that is mixed with thus is shorter, general needs 30 minutes, overcome the long defective of soak time of tradition and external existing conventional oil-based stuck freeing fluid, and unfreezing efficient height can more fast and effeciently be removed the pressure reduction that is taken place in creeping into and adhere to lock of tool drilling.
Embodiment 3
As another better embodiment of the present invention, mix by the component of following weight per-cent: 5% organophilic clay, 1% primary emulsion, 1% auxilliary emulsifying agent, 5% seizureproof agent, 5% unslaked lime, 25% quickly penetrating agent, all the other are diesel oil.
Embodiment 4
As preferred forms of the present invention, on the basis of embodiment 1,2 and 3, in described oil-based stuck freeing fluid, also add an amount of barite is arranged, bar consumption mainly is to satisfy in the different densities scope to use this stuck freeing spotting fluid safely, as a rule be the barite that adds by with respect to the 5%-300% of stuck freeing spotting fluid weight percent, regulate stuck freeing spotting fluid density.Described diesel oil is commercially available common 0# diesel oil, and itself just has certain destruction to the mud cake of water-base drilling fluid, and it can also dissolving oil dissolubility solid matter and paste substance simultaneously.Described organophilic clay is commercially available technical grade 928 types, mainly is the adjusting of rheological, also is the needs of system stability simultaneously.Described primary emulsion is commercially available technical grade SP-80 (this benzene 80 of chemical name), and a mud cake destruction is also had in the emulsification of aggravation diesel oil and mud cake water and stratum water.Described auxilliary emulsifying agent is commercially available technical grade ALR (aluminum stearate), is the oil soluble powder powder, has the KT foam of elimination and emulsification function, and there is certain plugging action on the stratum.Described seizureproof agent is commercially available technical grade RLC-101, and its main component is sulfonated gilsonite, gives birth to pitch that its effect is the filter loss that reduces releasing stuck agent, simultaneously the stratum is had very strong plugging action, reduces the perviousness on stratum.Described unslaked lime is commercially available technical grade CaO, and it is Powdered, regulates the pH value, and the free water in the absorption releasing stuck agent improves unfreezing efficient, has concurrently simultaneously and destroys mud cake and plugging action.What described barite was commercially available is the technical grade barite, and it is Powdered, is the most common mineral of barium, i.e. barium sulfate, and its composition is BaSO
4Described quickly penetrating agent is commercially available technical grade KT (sodium succinate), and liquid also makes quickly penetrating agent be commonly called as fast T, is the major ingredient of releasing stuck agent, mainly is the effect of seepage failure mud cake.
Claims (4)
1, a kind of oil-based stuck freeing fluid for well drilling, it is characterized in that mixing: 4%～5% organophilic clay by the component of following weight per-cent, 1%～1.5% primary emulsion, 0.5%～1% auxilliary emulsifying agent, 4%～5% seizureproof agent, 5%～6% unslaked lime, 25%～30% quickly penetrating agent, all the other are diesel oil; In described oil-based stuck freeing fluid, also add the barite that has with respect to the 5%-300% of stuck freeing spotting fluid weight percent; Described primary emulsion is technical grade SP-80, this benzene 80 of its chemical name; Described auxilliary emulsifying agent is technical grade ALR, and promptly aluminum stearate is the oil soluble powder powder; Described seizureproof agent is technical grade RLC-101, and its main component is sulfonated gilsonite, living pitch; Described quickly penetrating agent is technical grade KT, i.e. sodium succinate.
2, oil-based stuck freeing fluid for well drilling according to claim 1 is characterized in that: described diesel oil is common 0# diesel oil.
3, oil-based stuck freeing fluid for well drilling according to claim 1 is characterized in that: described organophilic clay is technical grade 928 type organophilic clays.
4, oil-based stuck freeing fluid for well drilling according to claim 1 is characterized in that: described unslaked lime is Powdered, regulates the pH value, the technical grade CaO of free water in the absorption releasing stuck agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058919 CN101531889B (en) | 2009-04-13 | 2009-04-13 | Oil-based stuck freeing fluid for well drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058919 CN101531889B (en) | 2009-04-13 | 2009-04-13 | Oil-based stuck freeing fluid for well drilling |
Publications (2)
| Publication Number | Publication Date |
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| CN101531889A true CN101531889A (en) | 2009-09-16 |
| CN101531889B CN101531889B (en) | 2010-12-29 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838524A (en) * | 2010-05-13 | 2010-09-22 | 四川西南油大石油工程有限公司 | Oil soluble jam releasing agent for drilling fluid |
| CN101921579A (en) * | 2010-09-29 | 2010-12-22 | 中国石油集团西部钻探工程有限公司 | Low-fluorescence sticking reliever and preparation method thereof |
| CN102504772A (en) * | 2011-10-09 | 2012-06-20 | 山东华阳油业有限公司 | Biodiesel drilling fluid and preparation method thereof |
| CN103074046A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Completion fluid used for removing filter cake formed by oil-based drilling fluid and preparation method thereof |
| CN103387822A (en) * | 2012-05-09 | 2013-11-13 | 天津市宏科泥浆助剂厂 | Low-fluorescence oil-base pipe-freeing agent and preparation method thereof |
| US9562185B2 (en) | 2013-06-26 | 2017-02-07 | Gungho Charge (Tianjin) Refined Petroleum Technology Development Co., Ltd | High-temperature resistant nano composite mining additive for mining heavy oil and super heavy oil and preparation process thereof |
| CN106590561A (en) * | 2016-10-19 | 2017-04-26 | 中石化石油工程技术服务有限公司 | Palm oil based pipe free agent and preparation method thereof |
| CN107312512A (en) * | 2017-06-29 | 2017-11-03 | 常州西夏墅东方工具有限公司 | A kind of oil base decoder |
| CN113025295A (en) * | 2021-05-26 | 2021-06-25 | 陕西万普隆油气技术服务有限公司 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
| CN116445147A (en) * | 2023-06-14 | 2023-07-18 | 中石化西南石油工程有限公司 | Sea stratum unclamping acid liquid and acid soaking unclamping method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034081C (en) * | 1991-01-22 | 1997-02-19 | 四川石油管理局川西南矿区 | Multifunctional bidirectional anti-collapse lubricant and production method thereof |
| US6156708A (en) * | 1997-02-13 | 2000-12-05 | Actisystems, Inc. | Aphron-containing oil base fluids and method of drilling a well therewith |
| CN1621656A (en) * | 2003-11-26 | 2005-06-01 | 四川石油管理局 | Method for configuring and maintaining long section barefoot drilling fluid |
| CN100363455C (en) * | 2004-10-29 | 2008-01-23 | 中国石油化工股份有限公司 | Positive electricity water-base pipe-freeing concentrate and its preparation method |
-
2009
- 2009-04-13 CN CN 200910058919 patent/CN101531889B/en active Active
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| CN101838524B (en) * | 2010-05-13 | 2012-11-14 | 四川西南油大石油工程有限公司 | Oil soluble jam releasing agent for drilling fluid |
| CN101838524A (en) * | 2010-05-13 | 2010-09-22 | 四川西南油大石油工程有限公司 | Oil soluble jam releasing agent for drilling fluid |
| CN101921579A (en) * | 2010-09-29 | 2010-12-22 | 中国石油集团西部钻探工程有限公司 | Low-fluorescence sticking reliever and preparation method thereof |
| CN101921579B (en) * | 2010-09-29 | 2013-01-09 | 中国石油集团西部钻探工程有限公司 | Low-fluorescence sticking reliever and preparation method thereof |
| CN102504772A (en) * | 2011-10-09 | 2012-06-20 | 山东华阳油业有限公司 | Biodiesel drilling fluid and preparation method thereof |
| CN102504772B (en) * | 2011-10-09 | 2014-02-05 | 山东华阳油业有限公司 | Biodiesel drilling fluid and preparation method thereof |
| CN103074046B (en) * | 2011-10-25 | 2015-05-13 | 中国石油化工股份有限公司 | Completion fluid used for removing filter cake formed by oil-based drilling fluid and preparation method thereof |
| CN103074046A (en) * | 2011-10-25 | 2013-05-01 | 中国石油化工股份有限公司 | Completion fluid used for removing filter cake formed by oil-based drilling fluid and preparation method thereof |
| CN103387822A (en) * | 2012-05-09 | 2013-11-13 | 天津市宏科泥浆助剂厂 | Low-fluorescence oil-base pipe-freeing agent and preparation method thereof |
| US9562185B2 (en) | 2013-06-26 | 2017-02-07 | Gungho Charge (Tianjin) Refined Petroleum Technology Development Co., Ltd | High-temperature resistant nano composite mining additive for mining heavy oil and super heavy oil and preparation process thereof |
| CN106590561A (en) * | 2016-10-19 | 2017-04-26 | 中石化石油工程技术服务有限公司 | Palm oil based pipe free agent and preparation method thereof |
| CN107312512A (en) * | 2017-06-29 | 2017-11-03 | 常州西夏墅东方工具有限公司 | A kind of oil base decoder |
| CN113025295A (en) * | 2021-05-26 | 2021-06-25 | 陕西万普隆油气技术服务有限公司 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
| CN116445147A (en) * | 2023-06-14 | 2023-07-18 | 中石化西南石油工程有限公司 | Sea stratum unclamping acid liquid and acid soaking unclamping method |
| CN116445147B (en) * | 2023-06-14 | 2023-10-24 | 中石化西南石油工程有限公司 | Sea stratum unclamping acid liquid and acid soaking unclamping method |
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| CN101531889B (en) | 2010-12-29 |
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Effective date of registration: 20200917 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: The 1 section of No. 3 company Chuanqing Drilling Technology Information Office Chenghua District Green Road 610051 Chengdu City, Sichuan Province Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |
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