CN105086959A - Strongly inhibitory water-based drilling fluid, preparation method therefor and application thereof - Google Patents
Strongly inhibitory water-based drilling fluid, preparation method therefor and application thereof Download PDFInfo
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Abstract
The invention provides a strongly inhibitory water-based drilling fluid, a preparation method therefor and application thereof. The drilling fluid comprises water, an amphoteric ionic polymer, anhydrous calcium chloride, a soil phase and a flow pattern modifier, wherein based on the water weight, the amphoteric ionic polymer accounts for 0.5-5 wt%, the anhydrous calcium chloride accounts for 20-70 wt%, the soil phase accounts for 0-6 wt% and the flow pattern modifier accounts for 0.1-0.4 wt%. The invention further provides a synthesis method for the water-based drilling fluid and application thereof. According to the drilling liquid provided by the invention, by virtue of a synergistic effect of the calcium chloride and the amphoteric ionic polymer, the drilling fluid has good rheological performance, filtration control performance, inhibition performance, sealing performance and lubricating performance.
Description
Technical field
The present invention relates to a kind of drilling fluid, particularly relate to a kind of drilling fluid containing amphoteric ion polymer.
Background technology
By force, easily there is leakage for shale gas stratum cranny development, water sensitivity, collapse, the feature such as undergauge, in drilling process, solve wellbore stability, fall the problems such as resistance antifriction and just become the most important thing that drilling fluid selects.Mainly adopt oil base drilling fluid in current domestic shale gas horizontal well drilling process, but oil base drilling fluid high cost, high pollution are its natural flaws.If water-base drilling fluid can in suppression, shutoff, lubricate, take in rock sand removal etc. and have breakthrough, very huge in the application prospect of shale gas horizontal well.At present, the water-base drilling fluid with larger application potential has glucose glycoside drilling fluid, polyamine class drilling fluid, polyglycol drilling fluid, drilling workers and silicate drilling fluid etc.These drilling fluid systems also need on existing basis, continue in-depth research, develop supporting treatment agent, meet the needs of shale gas development of resources, and drilling fluid system can be made towards the future development of environmental protection.
Chinese patent CN103146364A describes a kind of high inhibition water-base drilling fluid, and it comprises water, polyamine inhibitor, suppressed dose of bag, hydrate inhibitor, tackifier, fluid loss agent and liquid lubricant.Drilling fluid effectively can suppress deep water shallow stratum borehole well instability, and its inhibition is suitable with oil base drilling fluid.The shale rolling rate of recovery is not higher than 95%.Drilling fluid can solve the Generating Problems of hydrate in deepwater drilling, is applicable in the drilling operation of the 3000m depth of water.Chinese patent CN102250595A discloses the drilling fluid for strong retraction activated clay stratum, be made up of wilkinite, partially hydrolyzed polyacrylamide, low adhesive aggregation anionic cellulose, co-polymer of sulfonate tackifier, Repone K, polymeric alcohol, amine based polymer, fatty alcohol-ether phosphoric acid ester, water, this drilling fluid rejection and lubricity are close to oil base drilling fluid.Chinese patent CN103013470A discloses a kind of for ultra-deep sidetracked hole mud stone high inhibition drilling fluid system, by bentonite slurry, alkaline conditioner, shale control agent, metal ion polymkeric substance, valchovite, sulfonated phenol formaldehyde resin, cationic emulsified bitumen, lubricant, emulsifying agent, crude oil and calcium carbonate superfine powder, described drilling fluid system is to mud shale strong inhibition capability, shale recovery ratio is up to 90.33%, and high temperature resistance reaches 150 DEG C; The aging front and back coefficient of friction resistance is less than 0.1 respectively.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of high inhibition water-base drilling fluid and its preparation method and application.Drilling fluid of the present invention, by the synergy of calcium chloride and amphoteric ion polymer, makes drilling fluid have excellent rheological property, vena caval filter performance, rejection, sealing characteristics, lubricity etc.
The invention provides a kind of water-base drilling fluid, described drilling fluid comprises water, amphoteric ion polymer, Calcium Chloride Powder Anhydrous, the soil phase, flow pattern regulator, wherein, with the weight of water for benchmark, amphoteric ion polymer consumption is the 0.5-5wt% of water consumption, is preferably 1.5-3wt%; Calcium Chloride Powder Anhydrous consumption is the 20-70wt% of water consumption, preferred 30-60wt%; Soil phase consumption is the 0-6wt% of water consumption, and be preferably 1.5-4wt%, flow pattern regulator consumption is the 0.1-0.4wt% of water consumption, preferred 0.2-0.3wt%.
In water-base drilling fluid of the present invention, the described soil phase is one or more in sodium bentonite, calcium-base bentonite, attapulgite, sepiolite.
In water-base drilling fluid of the present invention, described flow pattern regulator is one or more in xanthan gum, guar gum, welan gum.
In water-base drilling fluid of the present invention, can also comprise weighting agent, described weighting agent is barite, Wingdale, rhombohedral iron ore, wustite, ferric oxide, one or more in magnesiumcarbonate, can decide add-on according to the requirement of drilling fluid density.
In water-base drilling fluid of the present invention, can also comprise shale control agent, described shale control agent consumption is the 0.1-2wt% of water consumption, is preferably 1-2wt%.Described shale control agent can Repone K, potassium sulfate, saltpetre, ammonium chloride, ammonium sulfate, ammonium nitrate, polyoxyethylene glycol, polypropylene glycol, one or more in polyoxyethylene glycol propylene glycol block polymkeric substance.
Amphoteric ion polymer of the present invention is N, N-dimethyl-allyl propanesulfonic acid salt/acrylamide copolymer, and concrete structure is as follows:
The synthetic method of amphoteric ion polymer of the present invention comprises the steps:
(1) N that mol ratio is 2:1 ~ 8:1 is taken first respectively, N-DMAA and 1,3-N-morpholinopropanesulfonic acid lactone, and to N, add PS in N-DMAA, then at the temperature of 10 ~ 60 DEG C, react 0.5 ~ 4h, finally by filtration, extracting, dry obtained N, N-dimethyl-allyl propanesulfonic acid salt;
(2) according to (5 ~ 2): the mol ratio of (5 ~ 8) takes the N obtained of step (1) respectively, N-dimethyl-allyl propanesulfonic acid salt and acrylamide, pass into N after adding dissolution with solvents
2deoxygenation reaction 0.5 ~ 1h, is warming up to 50 ~ 70 DEG C simultaneously, adds initiator for reaction 4 ~ 6h, obtain gelatinous solid after reaction, obtain white depositions with acetone precipitation after constant temperature 5 ~ 10min;
(3) throw out step (2) obtained is pulverized after dry 16 ~ 24h at 100 ~ 120 DEG C, final amphoteric ion copolymer.
In the synthetic method of amphoteric ion polymer of the present invention, in step (1), the mol ratio of N, N-DMAA and PS is 3:1 ~ 5:1.
In the inventive method, PS is added drop-wise to N in step (1), in N-DMAA or directly disposablely join N, in N-DMAA, and preferably direct feed postition.Adopt and directly disposablely add the fashionable N taken, N-DMAA and PS mol ratio is 5:1 ~ 8:1.During employing dropping mode, N, N-DMAA and PS mol ratio are 2:1 ~ 5:1, can by PS heat fused before dropping.
In the synthetic method of amphoteric ion polymer of the present invention, the reaction conditions of step (1) is react 1 ~ 3h at the temperature of 20 ~ 55 DEG C.
In the synthetic method of amphoteric ion polymer of the present invention, in step (1), extraction solvent selects methyl alcohol or ethanol, preferred alcohol, and extraction times is 1 ~ 3h.Described drying is dry 10 ~ 20h under 30 ~ 50 DEG C of conditions.
In the synthetic method of amphoteric ion polymer of the present invention, described in step (2), solvent is deionized water or salt solution, and after adding solvent, monomer total mass concentration is 20% ~ 40%, and the NaCl concentration added in described salt solution is 0 ~ 0.5mol/L.
In the synthetic method of amphoteric ion polymer of the present invention, the initiator used in step (2) is Potassium Persulphate, in Sodium Persulfate, ammonium persulphate any one; Described initiator amount accounts for monomer total mass 0.4% ~ 0.7%.
Water-base drilling fluid of the present invention is prepared by the following method, first proportionally water, amphoteric ion polymer, Calcium Chloride Powder Anhydrous, the soil phase, flow pattern regulator is taken respectively, then in water, the soil phase is added, abundant aquation or dispersion after, add flow pattern regulator, high-speed stirring adds Calcium Chloride Powder Anhydrous after making it fully dissolve, after adding Calcium Chloride Powder Anhydrous, temperature rises, after being down to room temperature, adding amphoteric ion polymer, leaving standstill maintenance 24 ~ 48h after high-speed stirring dispersion, obtain drilling fluid.
The present invention relates to the application of a kind of water-base drilling fluid in drilling process, in drilling process, can be now with the current.
Compared with prior art, drilling fluid tool of the present invention has the following advantages:
(1) CaCl in water-base drilling fluid of the present invention
2play the role of a nucleus with amphoteric ion polymer, the two synergy plays Multifunctional effect, comprises rheological property, vena caval filter, rejection, lubricity etc.Wherein the viscosity of amphoteric ion polymer is with CaCl
2the increase of content and increasing gradually, embodies obvious thickening and carries and cut effect; Due to high-content CaCl
2existence, shield the internal salt structure in amphoteric ion polymer structure, contained sulfonic group and ammonium fully exposed, acts on the soil phase further, enhance the filtrate reducing ability of system; High-content CaCl
2all have stronger rejection with amphoteric ion polymer self, their the collaborative inhibition of system that makes is stronger; The lubricity of system has has met or exceeded the level of oil base drilling fluid; The excellent properties of above entirety is that current water-base drilling fluid is short of.
(2) amphoteric ion polymer synthetic method of the present invention is by 1,3-N-morpholinopropanesulfonic acid lactone joins excessive N, in N-DMAA, excessive N, N-DMAA not only can participate in reaction as raw material, and the effect of solvent can be played, avoiding in ordinary method and use poisonous acetone for solvent, is a kind of synthetic method of green.
(3) amphoteric ion polymer synthetic method of the present invention is by control 1,3-N-morpholinopropanesulfonic acid lactone and N, mole when feeding mode of N-DMAA, solve 1,3-N-morpholinopropanesulfonic acid lactone and N, (be generally equimolar ratio reaction) when N-DMAA conventionally directly reacts, monomer N can not be obtained, the problem of N-dimethyl-allyl propanesulfonic acid salt.
(4) amphoteric ion copolymer prepared of the inventive method, because N, N-dimethyl-allyl propanesulfonic acid salt is macromolecular polymeric monomer, the polymkeric substance that its copolymerization obtains has long-chain branch.In aqueous due to the existence of long-chain branch, add the sterically hindered of polymkeric substance, increase the hydrodynamic volume of polymkeric substance, cause the trend of polymkeric substance temperature influence fracture hydrolysis to reduce, thus improve the performance of its heatproof, heatproof can reach 180 DEG C.
(5) amphoteric ion copolymer prepared of the inventive method belong in salt form amphoteric ion polymer, with traditional amphoteric ion polymer unlike, it due to electrostatic attraction effect, shows as molecular chain and curls between fresh water Middle molecule.And in high salt high calcium solution, due to the existence of small molecule salt, shield intermolecular association, intermolecular electrostatic attraction is changed into electrostatic repulsion forces, molecular chain is unfolded more.Obvious " anti-polyelectrolyte " effect that it shows makes the performance of polymkeric substance strengthen gradually with the increase of salt amount.Can the saturated and CaCl of anti-NaCl
2saturated, this is the anti-calcium and anti-salt performance that amphoteric ion polymer nearly all at present does not possess.Also containing a large amount of quaternary ammonium cationic groups in the amphoteric ion copolymer structure that the inventive method obtains, polymkeric substance is made to have superior shale inhibition energy.
Embodiment
Illustrate the effect of the inventive method below in conjunction with embodiment, but following examples do not form the restriction to the present invention program.
Embodiment 1
First N is prepared, N-dimethyl-allyl propanesulfonic acid salt.
Take 430gN, N-DMAA (DA) is poured in reactor, then puts into thermostat water bath, heats and starts to stir.Take 122g1 again, 3-N-morpholinopropanesulfonic acid lactone (PS), directly joins in DA, and temperature of reaction is 45 DEG C, obtains N after stirring reaction 3h, the thick product of N-dimethyl-allyl propanesulfonic acid salt (DAPS).Thick for DAPS transferred product wrapped in large stretch of filter paper, be positioned in Soxhlet extraction device, use ethanol is solvent extraction 3h, is placed in loft drier after extracting by filter paper packet, and dry at 50 DEG C, finally obtain pure DAPS monomer, productive rate is 94.3%.
Comparative example 1(direct reaction)
According to stoichiometric ratio DA:PS be 1:1 reaction.Taking 85gDA pours in reactor, then puts into thermostat water bath, heats and starts to stir.Take 122gPS again, directly join in DA, temperature of reaction is 20 DEG C, obtains mass polymerization product after stirring reaction 0.5h, and without DAPS monomer, productive rate is 0.During according to stoichiometric reaction, producing a large amount of heat in reaction cannot leave in time, and temperature moment sharply rises, and causes raw material DA and product D APS to be all polymerized.
Comparative example 2(ordinary method take acetone as solvent reaction)
Taking 90gDA pours in reactor, then puts into thermostat water bath, heats and starts to stir.Take 122gPS again and be dissolved in 650g acetone, directly joined in DA by mixing solutions, temperature of reaction is 60 DEG C, obtains the thick product of DAPS after stirring reaction 4h.Thick for DAPS transferred product wrapped in large stretch of filter paper, be positioned in Soxhlet extraction device, use ethanol is solvent extraction 2h, is placed in loft drier after extracting by filter paper packet, and dry at 35 DEG C, finally obtain pure DAPS monomer, productive rate is 81.7%.
Embodiment 2
Take 103gDAPS respectively, 35gAM, be transferred to reactor after adding a certain amount of deionized water dissolving, total monomer is 35%.Pass into N
2deoxygenation 1h, is warming up to 60 DEG C simultaneously, adds 0.7g Potassium Persulphate after keeping 30min, obtains gelatinous solid, obtain white depositions with acetone precipitation after reaction 6h.Pulverize after dry 24h at 110 DEG C, final DAPS/AM amphoteric ion copolymer.
Embodiment 3
Take 60gDAPS respectively, 50gAM, 15gNaCl, be transferred to reactor after adding a certain amount of deionized water dissolving, total monomer is 40%.Pass into N
2deoxygenation 1h, is warming up to 55 DEG C simultaneously, adds 0.75g ammonium persulphate after keeping 30min, obtains gelatinous solid, obtain white depositions with acetone precipitation after reaction 5h.Pulverize after dry 24h at 110 DEG C, final DAPS/AM amphoteric ion copolymer.
Embodiment 4
First take 350ml tap water, add 7g attapulgite, after high-speed stirring 10min, add 1.2g xanthan gum, continue high-speed stirring 10min, leave standstill maintenance 2h; Add the anhydrous CaCl of 130g
2, leave standstill after high-speed stirring 10min and be cooled to room temperature; Add polymkeric substance prepared by 6.5g embodiment 2, high-speed stirring 10min, leave standstill maintenance 24h, obtain drilling fluid system.
Embodiment 5
First take 350ml tap water, add 10g calcium-base bentonite, after high-speed stirring 10min, add 1g welan gum, continue high-speed stirring 10min, leave standstill maintenance 2h; Add the anhydrous CaCl of 180g
2, leave standstill after high-speed stirring 10min and be cooled to room temperature; Add polymkeric substance prepared by 10g embodiment 3, high-speed stirring 10min, leave standstill maintenance 36h, obtain drilling fluid system.
Embodiment 6
Identical with embodiment 4, difference is drilling fluid not chloride containing calcium.
Embodiment 7
Identical with embodiment 4, difference is that in drilling fluid, calcium chloride consumption is the 2wt% of water consumption.
Embodiment 8
Identical with embodiment 4, difference is that in drilling fluid, calcium chloride consumption is the 5wt% of water consumption.
Embodiment 9
Identical with embodiment 4, difference is that in drilling fluid, calcium chloride consumption is the 10wt% of water consumption.
Embodiment 10
Identical with embodiment 4, difference is that in drilling fluid, calcium chloride consumption is the 25wt% of water consumption.
Testing performance of drilling fluid:
Testing performance of drilling fluid comprises the test of rheological property, vena caval filter, rejection, lubricity, and test result is in table 1 ~ table 4.Wherein, rheological property uses ZNN-D6 type six fast rotational viscosimeter to measure, and calculates each rheological parameter by the φ 600, the φ 300 that obtain, φ 6, φ 3 data; Filter loss uses the multi-joint middle press filtration of SD-6A type to commit a breach of etiquette and high pressure high temperature filter tester measures, test duration 30min; Rejection is that test is reclaimed in shale rolling, and method is: add in drilling fluid by the shale of certain mass, and roll aging 16h at 120 DEG C, takes out with the recovery of 0.42mm standard sieve, calculates primary recovery.Shale after recovery is positioned in clear water the aging 2h that rolls at 120 DEG C, takes out and reclaims with 0.42mm standard sieve, calculate secondary returning yield; Lubricity uses extreme boundary lubrication instrument EP-B and sticking coefficient determinator NF-2 to measure.
Table 1 rheological property
| PV/mPa·s | YP/Pa | Gel/Pa/Pa | Φ6/Φ3 | |
| Embodiment 4 | 31 | 12 | 5/9 | 6/5 |
| Embodiment 5 | 33 | 9 | 6/8 | 5/3 |
| Embodiment 6 | 17 | 3 | 2/3 | 1/1 |
| Embodiment 7 | 18 | 4 | 2/3 | 1/1 |
| Embodiment 8 | 20 | 4 | 2/3 | 2/1 |
| Embodiment 9 | 22 | 5 | 3/4 | 2/1 |
| Embodiment 10 | 26 | 6.5 | 3.5/4.5 | 3/2 |
Table 2 vena caval filter
| API filtration/ml(normal temperature) | API filtration/ml(120 DEG C) | HTHP filter loss/ml(80 DEG C) | |
| Embodiment 4 | 3.5 | 3.2 | 6 |
| Embodiment 5 | 4.0 | 4.8 | 7.5 |
| Embodiment 6 | 9.5 | 9.2 | 12 |
| Embodiment 7 | 9.0 | 8.2 | 10 |
| Embodiment 8 | 8.0 | 8.0 | 8 |
| Embodiment 9 | 7.2 | 6.5 | 7.5 |
| Embodiment 10 | 5.5 | 5.0 | 6.5 |
Table 3 rejection
| Primary recovery/% | Secondary returning yield/% | |
| Embodiment 4 | 100 | 100 |
| Embodiment 5 | 100 | 100 |
| Clear water | 9.8 | -- |
| Embodiment 6 | 92.8 | 88.5 |
| Embodiment 7 | 93.4 | 88.0 |
| Embodiment 8 | 95.1 | 91.1 |
| Embodiment 9 | 96.2 | 92.5 |
| Embodiment 10 | 97.3 | 93.5 |
Table 4 lubricity
| Lubricating coefficient | Filter cake sticking coefficient | |
| Embodiment 4 | 0.086 | 0.00338 |
| Embodiment 5 | 0.038 | 0.00845 |
| Embodiment 6 | 0.118 | 0.1014 |
| Embodiment 7 | 0.108 | 0.0845 |
| Embodiment 8 | 0.094 | 0.0803 |
| Embodiment 9 | 0.091 | 0.0676 |
| Embodiment 10 | 0.089 | 0.0422 |
Claims (16)
1. a water-base drilling fluid, it is characterized in that described drilling fluid comprises water, amphoteric ion polymer, Calcium Chloride Powder Anhydrous, the soil phase, flow pattern regulator, wherein, with the weight of water for benchmark, amphoteric ion polymer consumption is the 0.5-5wt% of water consumption, is preferably 1.5-3wt%; Calcium Chloride Powder Anhydrous consumption is the 20-70wt% of water consumption, preferred 30-60wt%; Soil phase consumption is the 0-6wt% of water consumption, and be preferably 1.5-4wt%, flow pattern regulator consumption is the 0.1-0.4wt% of water consumption, preferred 0.2-0.3wt%, and described amphoteric ion polymer is N, N-dimethyl-allyl propanesulfonic acid salt/acrylamide copolymer.
2. according to water-base drilling fluid according to claim 1, it is characterized in that: the described soil phase is one or more in sodium bentonite, calcium-base bentonite, attapulgite, sepiolite.
3. according to water-base drilling fluid according to claim 1, it is characterized in that: described flow pattern regulator is xanthan gum, one or more in guar gum, welan gum.
4. according to water-base drilling fluid according to claim 1, it is characterized in that: described amphoteric ion polymer is prepared as follows: (1) takes the N that mol ratio is 2:1 ~ 8:1 first respectively, N-DMAA and 1,3-N-morpholinopropanesulfonic acid lactone, and 1 is added in N, N-DMAA, 3-N-morpholinopropanesulfonic acid lactone, then at the temperature of 10 ~ 60 DEG C, 0.5 ~ 4h is reacted, finally by filtration, extracting, dry obtained N, N-dimethyl-allyl propanesulfonic acid salt; (2) according to (5 ~ 2): the mol ratio of (5 ~ 8) takes the N obtained of step (1) respectively, N-dimethyl-allyl propanesulfonic acid salt and acrylamide, pass into N after adding dissolution with solvents
2deoxygenation reaction 0.5 ~ 1h, is warming up to 50 ~ 70 DEG C simultaneously, adds initiator for reaction 4 ~ 6h, obtain gelatinous solid after reaction, obtain white depositions with acetone precipitation after constant temperature 5 ~ 10min; (3) throw out step (2) obtained is pulverized after dry 16 ~ 24h at 100 ~ 120 DEG C, obtains amphoteric ion polymer.
5. according to water-base drilling fluid according to claim 4, it is characterized in that: in step (1), the mol ratio of N, N-DMAA and PS is 3:1 ~ 5:1.
6. according to water-base drilling fluid according to claim 4, it is characterized in that: PS is added drop-wise to N in step (1), in N-DMAA or directly disposablely join N, in N-DMAA.
7. according to water-base drilling fluid according to claim 6, it is characterized in that: adopt and directly disposablely add the fashionable N taken, N-DMAA and PS mol ratio is 5:1 ~ 8:1.
8. according to water-base drilling fluid according to claim 6, it is characterized in that: during employing dropping mode, N, N-DMAA and PS mol ratio are 2:1 ~ 5:1.
9. according to water-base drilling fluid according to claim 4, it is characterized in that: described in step (1), extraction solvent selects methyl alcohol or ethanol, described extraction times is 1 ~ 3h.
10. according to water-base drilling fluid according to claim 4, it is characterized in that: described in step (2), solvent is deionized water or salt solution, the NaCl concentration added in described salt solution is 0 ~ 0.5mol/L, and after adding solvent, monomer total mass concentration is 20% ~ 40%.
11., according to water-base drilling fluid according to claim 4, is characterized in that: the initiator used in step (2) is Potassium Persulphate, in Sodium Persulfate, ammonium persulphate any one, described initiator amount accounts for monomer total mass 0.4% ~ 0.7%.
12., according to water-base drilling fluid according to claim 1, is characterized in that: described drilling fluid comprises shale control agent, and described shale control agent consumption is the 0.1-2wt% of water consumption, are preferably 1-2wt%.
13., according to water-base drilling fluid according to claim 12, is characterized in that: described shale control agent is one or more in Repone K, potassium sulfate, saltpetre, ammonium chloride, ammonium sulfate, ammonium nitrate, polyoxyethylene glycol, polypropylene glycol, polyoxyethylene glycol propylene glycol block polymkeric substance.
14., according to water-base drilling fluid according to claim 1, is characterized in that: described drilling fluid comprises weighting agent, and described weighting agent is barite, Wingdale, rhombohedral iron ore, wustite, ferric oxide, one or more in magnesiumcarbonate, can decide add-on according to the requirement of drilling fluid density.
The application of water-base drilling fluid in 15. claims 1 to 14 described in arbitrary claim in drilling process.
The preparation method of water-base drilling fluid described in arbitrary claim in 16. claims 1 to 14, comprise following content, first proportionally water, amphoteric ion polymer, Calcium Chloride Powder Anhydrous, the soil phase, flow pattern regulator is taken respectively, then in water, the soil phase is added, abundant aquation or dispersion after, add flow pattern regulator, high-speed stirring adds Calcium Chloride Powder Anhydrous after making it fully dissolve, after adding Calcium Chloride Powder Anhydrous, temperature rises, amphoteric ion polymer is added after being down to room temperature, leave standstill maintenance 24 ~ 48h after high-speed stirring dispersion, obtain drilling fluid.
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| CN107663450A (en) * | 2016-07-28 | 2018-02-06 | 安庆五宁精细化工有限责任公司 | A kind of efficient expansion-resisting agent of nonionic |
| CN108728058A (en) * | 2018-06-29 | 2018-11-02 | 长江大学 | A kind of drilling fluid inhibitor and its application |
| CN110734747A (en) * | 2018-07-18 | 2020-01-31 | 中石化石油工程技术服务有限公司 | potassium nitrate drilling fluid and preparation method thereof |
| CN110734747B (en) * | 2018-07-18 | 2022-07-08 | 中石化石油工程技术服务有限公司 | Potassium nitrate drilling fluid and preparation method thereof |
| CN110452669A (en) * | 2019-08-16 | 2019-11-15 | 中石化石油工程技术服务有限公司 | Low viscous undercut low cost Strong Inhibitive Drilling Fluids of one kind and preparation method thereof |
| CN116023913A (en) * | 2021-10-25 | 2023-04-28 | 中国石油化工股份有限公司 | Drilling fluid and preparation method and application thereof |
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