CN104650824A - Oil-gas bed well drilling anti-water blocking composition - Google Patents
Oil-gas bed well drilling anti-water blocking composition Download PDFInfo
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- CN104650824A CN104650824A CN201310571132.5A CN201310571132A CN104650824A CN 104650824 A CN104650824 A CN 104650824A CN 201310571132 A CN201310571132 A CN 201310571132A CN 104650824 A CN104650824 A CN 104650824A
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- waterproof lock
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
Abstract
An oil-gas bed well drilling anti-water blocking composition is an aqueous solution containing a surface active ingredient, wherein the surface active ingredient is jointly composed of a fluorocarbon surfactant and a biological surfactant. The anti-water blocking composition is simple in composition, is used in a well drilling fluid for development of an ultra-low permeability and/or low permeability oil-gas reservoir, not only can change the wettability of rock, reduces the surface tension of a well drilling fluid filtrate, reduces the oil-gas flow resistance and reduces liquid phase trapping damage during the process of implementing a well drilling operation on an oil-gas bed, but also has excellent thermal stability, and can reach the objectives of protecting the reservoir and improving the yield.
Description
Technical field
The present invention relates to a kind of for hydrocarbon zone drilling well, is the Waterproof lock composition implementing to reduce in drilling operation course liquid phase trap infringement in hypotonic hydrocarbon zone thoroughly.
Background technology
In low-permeability sandstone hydrocarbon-bearing pool, it is a common problem that the production efficiency caused due to water blocking damage reduces.In the operations such as drilling well, completion, pressure break, well workover, volume increase, extraneous water invasion stratum, the gathering producing aqueous phase is detained, and makes its row's of returning difficulty.The water blocking damage produced lower than capillary pressure because of effective driving pressure is difficult to remove for a long time.Because average pore diameter that is hypotonic, Oil in Super-low Permeability hydrocarbon zone is more much smaller than middle and high infiltration reservoir, so compared with conventional gas and oil layer, water-blocking effect that is hypotonic, Oil in Super-low Permeability hydrocarbon zone is more serious.
For low porosity and low permeability reservoirs, the little and poor connectivity of its pore throat size, therefore, in the ordinary course of things, it is not main that mud solid phase invades the infringement caused, and the infringement such as hydration and expansion of clay, liquid phase trap is easily brought out in the intrusion of drilling fluid filtrate.Drilling fluid filtrate due to hydrocarbon zone CLAY MINERALS AND THEIR SIGNIFICANCE and intrusion interacts and easily hydration swelling and dispersion occurs, and causes the permeability reduction of hydrocarbon zone and causes formation damage.In low porosity and low permeability reservoirs, due to arctation, capillary effect clearly.When oil (or gas), water two-phase are in blowhole during seepage flow, water droplet is hampered flowing through pore throat place, causes oil phase or gas phase permeability to reduce, namely causes liquid phase trap effect.
In the Waterproof lock measure of currently reported/use, by using surface active ingredient, to change the wettability of rock surface and the surface tension between the interfacial tension reduced between oil-aqueous phase and gas and liquid phase, be a kind of important settling mode.As the drilling fluid Waterproof lock agent that China Patent Publication No. CN102618224A reports a kind of cosurfactant such as propyl carbinol, n-hexyl alcohol, Pentyl alcohol by the tensio-active agents such as the sodium lauryl sulphate/sodium sulfonate containing 2-4 (w) %, 1-2 (w) % and vegetables oil, mineral wet goods composition forms.CN102887971A reports a kind of drilling fluid Waterproof lock agent containing being made up of the polymkeric substance of Butyl Acrylate Monomer, methyl methacrylate monomer, methacrylate monomer, acrylamide monomer and methacrylate ten trifluoro monooctyl ester monomer.It is primary surfactant by sodium lauryl sulphate/sodium sulfonate etc. that CN103045182A reports a kind of, and double-strand fluorocarbon surfactant is the drilling fluid Waterproof lock agent of the composition such as auxiliary tensio-active agent and inorganic salt.CN102634324A reports a kind of oil field Waterproof lock agent composite containing nonionogenic tenside, optimum tensio-active agent, organism and water.CN101423756A reports a kind of gas well water blocking damage treating agent, by host 2,3-epoxypropyltrimethylchloride chloride 15.0%-20.0% (w), polyoxyethylene octylphenol ether, or nonionogenic tenside 4.0%-7.0% (w) such as dodecyl phenol polyethenoxy ether, SR18Y fluorocarbon surfactant 0.5%-0.8% (w), cats products 5.0%-8.0% (w) such as two 8/10 alkyl dimethyl brometo de amonio or myristyl benzyl dimethyl ammonium chloride and water composition.Can gas well water blocking damage be reduced, reduce trigger pressure, improve core gas phase permeability, protection reservoir.Zhang Hongxia is at " hydrocarbon-bearing pool of application high-performance polyvalent alcohol drilling fluid protecting deep low-permeability " (" petroleum journal "; 210 (1)) proposing a kind of is initiator with low-molecular-weight alcohol; by the polyether glycol of oxyethane and propylene oxide copolymer; utilize the synergy of efficient surfactant and polyvalent alcohol, can at the Water-blocking damage alleviating low permeability reservoir to a greater extent." Sweet natural gas journal " 2011,33 (9) report the SATRO low permeability reservoir Waterproof lock agent that a kind of main ingredient is the compositions such as fluorocarbon surfactant, nonionogenic tenside, both sexes Anionic Gemini Surfactant, organosilicon froth breaking suds suppressor, effectively can reduce surface tension and the interfacial tension of solution, and heat and salinity tolerance performance is good, latherability is low.Hu Juan is in " the synthesis and characteries research of fluorocarbon surfactant " (China Petroleum Univ. (East-China), [collection number]: Y1542840) report with perfluoroalkyl acid, diethanolamine as raw material, synthesize non-ion fluorin carbon surface active agent N, N-dihydroxy ethyl perfluoroalkyl acid amides (FCDA), and its surfactivity is studied, lowest surface tension is 19.07mN/m, micelle-forming concentration CMC is 0.012mol/L, examine its chemical stability, temperature resistant antisalt performance, and inorganic salt, low-carbon alcohol is on the impact of foaming properties and oil-proofness.Also a kind of composition preventing local water from locking containing hydrocarbonaceous liquid, Alkylpolyglycoside, pentadecanol ethoxylate and straight-chain fatty alcohol is disclosed in US 20040229758.
The different surface active ingredient of choice for use is distinguished in the Waterproof lock agent of above-mentioned bibliographical information, but composition is general all comparatively complicated, use inconvenience, and cost is high.
Summary of the invention
For above-mentioned situation, the invention provides a kind of composition and greatly simplify, effect is hydrocarbon zone drilling well Waterproof lock composition more preferably.
Hydrocarbon zone drilling well Waterproof lock composition of the present invention, be the aqueous solution containing surface active ingredient, surface active ingredient is wherein made up of jointly fluorocarbon surfactant and bio-surfactant.Surface active ingredient weight content in the said aqueous solution is preferably 1.5 ~ 6.0%, and wherein the weight content of fluorocarbon surfactant is 0.5 ~ 2%, and the weight content of bio-surfactant is 1 ~ 4%.
In above-mentioned Waterproof lock composition, said fluoro-carbon surface active composition is preferably negatively charged ion fluorocarbon surfactant, such as, at least can comprise conventional at present perfluorinated sulfonate, perfluorocarboxylic acid salt or perfluor vitriol.As further optimal way, wherein said perfluorinated sulfonate can at least one preferably in perfluoro octyl sulfonic acid sodium or perfluor nonyl potassium sulfonate; Said perfluorocarboxylic acid salt can at least one preferably in perfluoro capryl carboxylic acid sodium, perfluor nonyl carboxylic acid sodium, perfluor nonyl carboxylic acid ammonium, the negatively charged ion fluorocarbon surfactant that perfluor vitriol can be preferably as conventional in F502 etc.Fluorine-containing tensio-active agent is because its intermolecular Van der Waals force is less, it is little that surface active molecules moves to tension force needed for solution surface, so surface active molecules can be assembled in solution surface, stronger surface adsorption can be produced, thus higher surfactivity can be had, temperature tolerance, good stability, can resist strong oxidizer, can in acid, alkali systems, keep it active.Further, the hydrophobic and oil repellent character of fluorine-containing alkyl makes fluorochemical surfactant at change rock wettability Be very effective.
Said bio-surfactant in above-mentioned Waterproof lock composition, can preferred commercially available conventional lipopeptid, soybean lecithin, sophorolipid, the rhamnosyl obtained at present
in fatat least one.Bio-surfactant, except having the feature of general tensio-active agent, because its structure is more complicated huge, has more active group, makes it can more effectively when reducing interfacial tension and surface tension, and anti-salt property is good, readily biodegradable.
Because low permeability gas reservoirs rock particles is little, specific surface area is large, and the adsorptivity of water is strong, and the mobility of gas is large, causes water-displacement rate low.The difference of air water wettability makes capillary pressure become the resistance of gas drive water, by capillary pressure formula:
In formula: PC-capillary pressure (Pa); σ-interfacial tension (mN/m); θ-wetting angle (o); R-capillary radius (mm).Can find out, in Oil in Super-low Permeability, low permeability reservoir, because pore size is narrow and small, capillary effect is particularly evident, and water lock is even more serious.σ is less for air-water interface tension force, and capillary radius is larger, and capillary pressure is less; Contact angle θ is from 0 ° of water complete wetting to the change procedure of intermediate wet 90 °, and capillary pressure also reduces.Test-results shows, after drilling fluid in petroleum exploration and development process or well finishing liquid add the above-mentioned Waterproof lock agent of the present invention of its volume 1-2%, significantly can reduce the surface tension of aqueous phase and increase water to the wetting angle on rock forming mineral surface, thus the capillary pressure of gas (oil) expelling water can be reduced, effectively prevent the water lock phenomenon on stratum.
Embodiment is by the following examples described in further detail foregoing of the present invention again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following example.Without departing from the idea case in the present invention described above, the various replacement made according to ordinary skill knowledge and customary means or change, all should comprise within the scope of the invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that Waterproof lock composition of the present invention affects rock core Absorb Water.
Embodiment
embodiment 1
Mix with water in the ratio of the F502 of 2% (w) and the rhamnolipid of 4% (w), namely obtain a kind of drilling fluid Waterproof lock composition of the present invention.
embodiment 2
PROCESS OF FLOWING TEST washes clean is also dry, measure water to the wetting angle of described rock core; By rock core, at the aqueous solution containing embodiment 1 composition 1wt%, (the FY-F502 actual content in the aqueous solution is 0.02%, rhamnolipid content is 0.04%) in soak 1 day, after taking out also drying, again measure water to the wetting angle of described rock core, adopt the method for GB/T 22237-2008 to measure 2% embodiment 1 composition solution the surface tension of 25 DEG C simultaneously.Its test result is as shown in table 1.
The impact of table 1 composition effects on surface tension force and core wettability
| Surface tension (25 DEG C, mN/m) | Contact angle before described compositions-treated | Contact angle after described compositions-treated |
| 14.097 | 0゜ | 84.1゜ |
embodiment 3
Cooperatively interacted by dissimilar tensio-active agent and form multi-form Waterproof lock composition, carry out the contrast experiment reducing aqueous solution surface tension effect, result is as shown in table 2.In table 4902,4903 is organic silicon surfactant, and F502, F501 are fluorine carbon tensio-active agents, and OP-10 is alkylphenol polyoxyethylene.
Table 2 surfactant compound rear surface tension force, mN/m
| 4902(0.02%) | 4903(0.02%) | F501(0.02%) | F502(0.02%) | Rhamnolipid (0.04%) | OP-10(0.1%) | |
| 0.02% 4902 | 18.3483 | 16.5648 | 15.3932 | 16.3258 | 19.8858 | 23.3205 |
| 0.02% 4903 | — | 18.5437 | 17.2954 | 15.9060 | 19.0833 | 19.0833 |
| 0.02% F501 | — | — | 17.7943 | 16.0892 | 17.5437 | 18.0473 |
| 0.02% F502 | — | — | — | 18.3027 | 14.0967 | 16.5584 |
| 0.04% rhamnolipid | — | — | — | — | 20.1581 | 22.7226 |
| 0.10% OP-10 | — | — | — | — | — | 19.0833 |
Table 2 result shows, selects the Waterproof lock composition of fluorochemical surfactant and rhanolipid as biosurfactant assembly, can have the capillary unusual effect of more reduction aqueous solution.
embodiment 4
Clean dry rock core, with rubber belt sealing rock core side, is hung on iron stand.Make bottom rock core, to contact 3%NaCl liquid level of solution, start timing simultaneously and record rock core water regain.Rock core height is regulated to keep only having bottom contact liquid level.3%NaCl solution is changed to 1% embodiment 1 Waterproof lock composition, carries out the experiment of rock core self-priming.Water saturation-the time curve of rock core self-priming as shown in Figure 1.Fig. 1 shows, the Waterproof lock composition of embodiment 1 can reduce rock core Absorb Water speed and the self-priming water yield.
embodiment 5
Drilling fluid composition (w%): wilkinite 4%
Na
2CO
3 0.16%
Metal amphoteric ion polymer MMCA 0.5%
Amphoteric ion polymer viscosity-depression agent XY-27 0.5%
Sulfonated phenolic resin SMP-2 3%
Sulfonation tannin SMT 3%
Sulfonated lignite SMC 3%
Lubricant RH220 4%
Plugging material FRD-1 3%
Calcium carbonate superfine powder QS-2 2%
Polyamine inhibitor 1%
Methylglucoside 8%
Water surplus.
Add the Waterproof lock composition of embodiment 1 in the ratio of 2% in above-mentioned drilling fluid after, experimental result is affected in table 3 to drilling fluid traditional performance.Table 3 result shows, this water-proofing composition decapacitation significantly reduces outside the surface tension of drilling fluid filtrate, on drilling fluid routinely substantially without impact.
Table 3 Waterproof lock composition is on the impact of drilling fluid traditional performance
| AV(mPa·s) | PV (mPa·s) | YP（Pa） | G 1/G 2（Pa/Pa） | FL(ml) | pH | Filtrate surface tension force (mN/m) | |
| Drilling fluid | 49.5 | 32 | 18.9 | 13/20 | 5.0 | 9 | 49.57 |
| Drilling fluid+Waterproof lock composition | 42.5 | 26 | 16.9 | 12/17 | 4.8 | 9 | 29.11 |
embodiment 6
Resume permeability experiment uses the multi-functional damage appraisement instrument of MFC-I type, and working specification is as follows:
(1) the natural Oil in Super-low Permeability basic properties of core of experiments of measuring, dries and claims its dry weight G
0;
(2) experiment rock core initial water saturation S is set up
wi=20%, rock core is sealed 24h; ;
(3) rock core is loaded core holding unit, add confined pressure (10MPa) and temperature (room temperature), be respectively 1 at flow differential pressure, 2,3,4,5,7MPa, with nitrogen forward displacement rock core, measured the gas flow Q under each pressure by soap bubble flowmeter
0i; During measurement, treat stream pressure and stability of flow, measure once every 10min, continuously measured 3 times, if difference is no more than 3% between the continuous rate of permeation measured for 3 times, next pressure spot can be surveyed; After measurement, calculate rate of permeation K
0i;
(4) rock core is loaded in the clamper of the multi-functional damage appraisement instrument of MFC-I type, confined pressure (10MPa), temperature (room temperature) are set, drill in fluid is heated to experimental temperature 80 DEG C, confined pressure change is observed in heat-processed, timely adjustment confined pressure, to guarantee on rock sample that net impact is advanced the speed when increasing confined pressure and is no more than 6.8MPa/h.After temperature-stable, open agitator (shearing rate (S simultaneously
-1)=40) and experiment pressure reduction (3.5MPa), recycle back drill in fluid 1h, record filtrate accumulation filter loss also calculates core permeability;
(5) rock core is loaded core holding unit, with nitrogen forward displacement 3h under pressure reduction is 5MPa;
(6) flow differential pressure 1,2,3,4,5, in 7MPa situation, with nitrogen forward displacement rock core, measured the flow Q1i under different pressures by soap bubble flowmeter respectively, calculate rate of permeation K1i.
(7) calculate rate of permeation before and after pollution by linear regression, and calculate permeability resume figure.
Core permeability recovery value is in table 4.Mixed solution in table in contaminating fluid hurdle, for drilling fluid adds the mixed solution of 2% embodiment 1 Waterproof lock composition.After showing to use Waterproof lock composition of the present invention, permeability resume figure can be brought up to about 85%.
Table 4 Waterproof lock composition is on the impact of core permeability
| Core numbers | Contaminating fluid | Rate of permeation K before polluting 0（10 -3μm 2） | Rate of permeation Kd(10 after polluting -3μm 2） | Permeability resume figure (Kd/ K 0，%) |
| 1 | Drilling fluid | 0.0039 | 0.0018 | 46.15 |
| 2 | Drilling fluid+2% embodiment 1 | 0.0065 | 0.0055 | 84.62 |
embodiment 7
That Waterproof lock composition of the present invention and at present conventional Waterproof lock agent product are reduced aqueous solution surface tension carries out contrasting the results are shown in Table 5.Wherein the add-on of Waterproof lock composition or product is 1wt%.Waterproof lock agent S in Waterproof lock agent product conventional is at present Dongying Lifeng New Chemical Materials Co., Ltd.'s product, and PF-SATRO is Jingzhou Jiahua Technology Co., Ltd.'s product, and the agent of C8 Waterproof lock is Dongying Shengshi Petroleum Technology Co., Ltd.'s product.
The contrast and experiment display of table 5, Waterproof lock composition of the present invention can reduce aqueous solution surface tension more, has better Waterproof lock effect.
Table 5 uses the surface tension of Waterproof lock composition of the present invention and current Waterproof lock agent product rear solution to contrast
| Laboratory sample | The agent of C8 Waterproof lock | PF-SATRO | S | The present invention |
| Surface tension, mN/m | 22.504 | 20.082 | 19.328 | 14,097 |
Claims (6)
1. hydrocarbon zone drilling well Waterproof lock composition is the aqueous solution containing surface active ingredient, it is characterized in that surface active ingredient is made up of jointly fluorocarbon surfactant and bio-surfactant.
2. hydrocarbon zone drilling well Waterproof lock composition as claimed in claim 1, it is characterized in that the surface active ingredient weight content in the said aqueous solution is 1.5 ~ 6.0%, wherein the weight content of fluorocarbon surfactant is 0.5 ~ 2%, and the weight content of bio-surfactant is 1 ~ 4%.
3. hydrocarbon zone drilling well Waterproof lock composition as claimed in claim 1, is characterized in that said fluoro-carbon surface active composition is negatively charged ion fluorocarbon surfactant.
4. hydrocarbon zone drilling well Waterproof lock composition as claimed in claim 3, is characterized in that said negatively charged ion fluorocarbon surfactant is perfluorinated sulfonate, perfluorocarboxylic acid salt or perfluor vitriol.
5. hydrocarbon zone drilling well Waterproof lock composition as claimed in claim 4, is characterized in that said perfluorinated sulfonate is at least one in perfluoro octyl sulfonic acid sodium or perfluor nonyl potassium sulfonate; Said perfluorocarboxylic acid salt is at least one in perfluoro capryl carboxylic acid sodium, perfluor nonyl carboxylic acid sodium, perfluor nonyl carboxylic acid ammonium.
6. the hydrocarbon zone drilling well Waterproof lock composition as described in one of claim 1 to 5, is characterized in that said bio-surfactant is at least one of lipopeptid, soybean lecithin, sophorolipid, rhamnolipid.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622878A (en) * | 2016-02-26 | 2016-06-01 | 武汉理工大学 | Preparation method of waterborne waterproof coating |
| CN108048071A (en) * | 2018-01-12 | 2018-05-18 | 中国海洋石油集团有限公司 | It is a kind of for chemical increasing production liquid of low permeability reservoir and preparation method thereof |
| CN108531149A (en) * | 2018-05-31 | 2018-09-14 | 中国海洋石油集团有限公司 | A kind of water base drilling liquid and its preparation method and application |
| CN109609104A (en) * | 2018-12-24 | 2019-04-12 | 厦门志信化学有限公司 | A kind of drilling fluid and its application |
| US10544353B2 (en) | 2017-07-28 | 2020-01-28 | Petrochina Company Ltd. | Surfactant that changes the wettability of tight sandstone and its preparation method and application |
| CN110821461A (en) * | 2019-10-28 | 2020-02-21 | 中国石油化工股份有限公司 | Composite water lock releasing process for low-permeability oil well |
| CN113216917A (en) * | 2021-06-17 | 2021-08-06 | 中国石油大学(华东) | Method for controlling nitrogen channeling in oil reservoir nitrogen injection huff-puff exploitation process |
| CN113462373A (en) * | 2021-07-13 | 2021-10-01 | 中国石油大学(华东) | Low-permeability oil and gas reservoir waterproof locking agent and preparation method and application thereof |
| CN113528099A (en) * | 2020-04-10 | 2021-10-22 | 中石化南京化工研究院有限公司 | Waterproof locking agent and preparation method thereof |
| CN114479808A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Natural gas reservoir water-lock releasing agent and preparation method and application thereof |
| CN115322761A (en) * | 2022-06-28 | 2022-11-11 | 西安川秦石油科技有限公司 | Easy-flowback water-locking releasing agent for natural gas well and preparation method thereof |
| CN115651095A (en) * | 2022-09-14 | 2023-01-31 | 中海油能源发展股份有限公司 | Well drilling waterproof locking agent and preparation method thereof |
| EP4269531A1 (en) | 2022-04-28 | 2023-11-01 | Evonik Operations GmbH | Multifunctional wax dispersant for subterranean chemical applications |
| EP4269530A1 (en) | 2022-04-28 | 2023-11-01 | Evonik Operations GmbH | Multifunctional wax dispersant for subterranean chemical applications |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622878A (en) * | 2016-02-26 | 2016-06-01 | 武汉理工大学 | Preparation method of waterborne waterproof coating |
| CN105622878B (en) * | 2016-02-26 | 2018-04-27 | 武汉理工大学 | A kind of preparation method of aqueous waterproofing paint |
| US10544353B2 (en) | 2017-07-28 | 2020-01-28 | Petrochina Company Ltd. | Surfactant that changes the wettability of tight sandstone and its preparation method and application |
| CN108048071A (en) * | 2018-01-12 | 2018-05-18 | 中国海洋石油集团有限公司 | It is a kind of for chemical increasing production liquid of low permeability reservoir and preparation method thereof |
| CN108531149A (en) * | 2018-05-31 | 2018-09-14 | 中国海洋石油集团有限公司 | A kind of water base drilling liquid and its preparation method and application |
| CN109609104A (en) * | 2018-12-24 | 2019-04-12 | 厦门志信化学有限公司 | A kind of drilling fluid and its application |
| CN109609104B (en) * | 2018-12-24 | 2021-04-27 | 厦门志信化学有限公司 | Drilling fluid and application thereof |
| CN110821461A (en) * | 2019-10-28 | 2020-02-21 | 中国石油化工股份有限公司 | Composite water lock releasing process for low-permeability oil well |
| CN110821461B (en) * | 2019-10-28 | 2021-11-30 | 中国石油化工股份有限公司 | Composite water lock releasing process for low-permeability oil well |
| CN113528099A (en) * | 2020-04-10 | 2021-10-22 | 中石化南京化工研究院有限公司 | Waterproof locking agent and preparation method thereof |
| CN114479808A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Natural gas reservoir water-lock releasing agent and preparation method and application thereof |
| CN113216917A (en) * | 2021-06-17 | 2021-08-06 | 中国石油大学(华东) | Method for controlling nitrogen channeling in oil reservoir nitrogen injection huff-puff exploitation process |
| CN113462373A (en) * | 2021-07-13 | 2021-10-01 | 中国石油大学(华东) | Low-permeability oil and gas reservoir waterproof locking agent and preparation method and application thereof |
| CN113462373B (en) * | 2021-07-13 | 2022-08-02 | 中国石油大学(华东) | Low-permeability oil and gas reservoir waterproof locking agent and preparation method and application thereof |
| EP4269531A1 (en) | 2022-04-28 | 2023-11-01 | Evonik Operations GmbH | Multifunctional wax dispersant for subterranean chemical applications |
| EP4269530A1 (en) | 2022-04-28 | 2023-11-01 | Evonik Operations GmbH | Multifunctional wax dispersant for subterranean chemical applications |
| CN115322761A (en) * | 2022-06-28 | 2022-11-11 | 西安川秦石油科技有限公司 | Easy-flowback water-locking releasing agent for natural gas well and preparation method thereof |
| CN115322761B (en) * | 2022-06-28 | 2024-03-01 | 西安川秦石油科技有限公司 | Preparation method of easily-flowback water locking agent for natural gas well |
| CN115651095A (en) * | 2022-09-14 | 2023-01-31 | 中海油能源发展股份有限公司 | Well drilling waterproof locking agent and preparation method thereof |
| CN115651095B (en) * | 2022-09-14 | 2024-02-23 | 中海油能源发展股份有限公司 | Waterproof locking agent for drilling well and preparation method thereof |
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