CN105086961A - Highly efficient water-based drilling fluid and synthesizing method and application therefor - Google Patents
Highly efficient water-based drilling fluid and synthesizing method and application therefor Download PDFInfo
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Abstract
The present invention provides a highly efficient water-based drilling fluid and a synthesizing method and application therefor. The drilling fluid comprises water, a zwitterion polymer, anhydrous calcium chloride, a soil phase and a flow pattern regulator, wherein, with the weight of the water as a reference, the weight of the zwitterion polymer is 0.5-5% of that of the water, the weight of the anhydrous calcium chloride is 20-70% of that of the water, the weight of the soil phase is 0-6% of that of the water and the weight of the flow pattern regulator is 0.1-0.4% of that of the water. The present invention further provides a synthesizing method and application for the water-based drilling fluid. According to the drilling water provided by the present invention, synergy between the calcium chloride and the zwitterion polymer enables the drilling fluid to have the excellent rheological property, filtration control property and inhibiting property, plugging property and lubricating property.
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-efficiency water-base drilling fluid and synthetic method thereof 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 methylacryoyloxyethyl-N, N-dimethyl propylene sulfonate/acrylamide copolymer, and concrete structure is as follows:
The synthetic method of amphoteric ion polymer of the present invention comprises the steps:
(1) dimethylaminoethyl methacrylate and 1 that mass ratio is 2:1 ~ 9:1 is taken first respectively, 3-N-morpholinopropanesulfonic acid lactone, and 1 is added in dimethylaminoethyl methacrylate, 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 methylacryoyloxyethyl-N, N-dimethyl propylene sulfonate;
(2) according to (4 ~ 2): the mol ratio of (6 ~ 8) takes the methylacryoyloxyethyl-N obtained of step (1) respectively, and N-dimethyl propylene sulfonate and acrylamide, pass into N after adding dissolution with solvents
2deoxygenation 0.5 ~ 1h, is warming up to 50 ~ 70 DEG C simultaneously, adds initiator for reaction 4 ~ 6h, obtains 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 mass ratio of dimethylaminoethyl methacrylate and PS is 2.5:1 ~ 8:1.
In the synthetic method of amphoteric ion polymer of the present invention, PS to be added drop-wise in dimethylaminoethyl methacrylate or directly disposablely to join in dimethylaminoethyl methacrylate in step (1), preferably direct feed postition.Adopt and directly disposablely add the fashionable dimethylaminoethyl methacrylate that takes and PS mass ratio is 5.2:1 ~ 7.8:1.During employing dropping mode, dimethylaminoethyl methacrylate and PS mass ratio are 2.5:1 ~ 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 0.3% ~ 0.5% of monomer total mass.
The synthetic method of water-base drilling fluid of the present invention comprises the steps, 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 in excessive dimethylaminoethyl methacrylate, excessive dimethylaminoethyl methacrylate 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, the quality when feeding mode of 3-N-morpholinopropanesulfonic acid lactone (PS) and dimethylaminoethyl (DM), solve 1, (equimolar ratio reaction is generally) when 3-N-morpholinopropanesulfonic acid lactone and dimethylaminoethyl conventionally directly react, monomer methylacryoyloxyethyl-N can not be obtained, the problem of N-dimethyl propylene sulfonate (DMAPS).
(4) amphoteric ion copolymer prepared of the inventive method, because DMAPS 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 150 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 amphoteric ion copolymer structure prepared by the inventive method, 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 methylacryoyloxyethyl-N is prepared, N-dimethyl propylene sulfonate (DMAPS)
Take 630gDM and put into reactor, then put into thermostat water bath, heat and start to stir.Take 122gPS again, directly join in DM, temperature of reaction is 35 DEG C, obtains the thick product of DMAPS after stirring reaction 1.5h.Thick for DMAPS transferred product is wrapped in large stretch of filter paper, be positioned in Soxhlet extraction device, use ethanol is solvent extraction 1h, after extracting, filter paper packet is placed in loft drier, dry at 40 DEG C, finally obtain pure DMAPS monomer, productive rate is 92.8%, (productive rate is the ratio of the actual quality obtaining product and the theoretical product quality be stoichiometrically obtained by reacting).
Comparative example 1(direct reaction)
According to stoichiometric ratio DM:PS be 1:1 reaction.Taking 157gDM pours in reactor, then puts into thermostat water bath, heats and starts to stir.Take 122gPS again, directly join in DM, temperature of reaction is 20 DEG C, obtains mass polymerization product after stirring reaction 0.5h, and without DMAPS 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 DM and product D MAPS to be all polymerized.
Comparative example 2(ordinary method take acetone as solvent reaction)
Taking 170gDM pours in reactor, then puts into thermostat water bath, heats and starts to stir.Take 122gPS again and be dissolved in 1170g acetone, directly joined in DM by mixing solutions, temperature of reaction is 60 DEG C, obtains the thick product of DMAPS after stirring reaction 4h.Thick for DMAPS 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 DMAPS monomer, productive rate is 82.4%.
Embodiment 2
Take 100gDMAPS respectively, 60gAM, 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 65 DEG C simultaneously, adds 0.5g 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 DMAPS/AM amphoteric ion copolymer.
Embodiment 3
Take 130gDMAPS respectively, 60gAM, 10gNaCl, be transferred to reactor after adding a certain amount of deionized water dissolving, total monomer is 30%.Pass into N
2deoxygenation 1h, is warming up to 55 DEG C simultaneously, adds 0.9g 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 DMAPS-AM amphoteric ion copolymer.
Embodiment 4
First take 350ml tap water, add 6g attapulgite, after high-speed stirring 10min, add 0.8g xanthan gum, continue high-speed stirring 10min, leave standstill maintenance 2h; Add the anhydrous CaCl of 140g
2, leave standstill after high-speed stirring 10min and be cooled to room temperature; Add polymkeric substance prepared by 7g embodiment 2, high-speed stirring 10min, leave standstill maintenance 24h, obtain drilling fluid.
Embodiment 5
First take 350ml tap water, add 8g 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 200g
2, leave standstill after high-speed stirring 10min and be cooled to room temperature; Add polymkeric substance prepared by 8.5g embodiment 3, high-speed stirring 10min, leave standstill maintenance 36h, obtain drilling fluid.
Embodiment 6
Identical with embodiment 4, difference is not chloride containing calcium in drilling fluid.
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 | 29 | 11 | 5/7 | 5/4 |
| Embodiment 5 | 31 | 12 | 5/7 | 5/3 |
| Embodiment 6 | 14 | 3 | 2/2 | 1/1 |
| Embodiment 7 | 17 | 4 | 2/3 | 1/1 |
| Embodiment 8 | 19 | 5 | 2/3 | 2/1 |
| Embodiment 9 | 21 | 6 | 3/4 | 2/1 |
| Embodiment 10 | 25 | 7 | 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 | 2.9 | 3.0 | 5 |
| Embodiment 5 | 4.0 | 4.8 | 7.5 |
| Embodiment 6 | 8.6 | 9.0 | 11 |
| Embodiment 7 | 7.5 | 8.0 | 10 |
| Embodiment 8 | 6.5 | 8.0 | 8.5 |
| Embodiment 9 | 6.0 | 6.5 | 7.5 |
| Embodiment 10 | 4.3 | 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 | 89.5 |
| Embodiment 7 | 93.4 | 89.0 |
| Embodiment 8 | 94.9 | 92.1 |
| Embodiment 9 | 95.8 | 92.7 |
| Embodiment 10 | 97.1 | 95.5 |
Table 4 lubricity
| Lubricating coefficient | Filter cake sticking coefficient | |
| Embodiment 4 | 0.077 | 0.00845 |
| Embodiment 5 | 0.045 | 0.02535 |
| Embodiment 6 | 0.122 | 0.1014 |
| Embodiment 7 | 0.108 | 0.0845 |
| Embodiment 8 | 0.103 | 0.0803 |
| Embodiment 9 | 0.087 | 0.0676 |
| Embodiment 10 | 0.080 | 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, be preferably 1.5-4wt%, flow pattern regulator consumption is the 0.1-0.4wt% of water consumption, preferred 0.2-0.3wt%, described amphoteric ion polymer is methylacryoyloxyethyl-N, N-dimethyl propylene sulfonate/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 dimethylaminoethyl methacrylate and 1 that mass ratio is 2:1 ~ 9:1 first respectively, 3-N-morpholinopropanesulfonic acid lactone, and 1 is added in dimethylaminoethyl methacrylate, 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 methylacryoyloxyethyl-N, N-dimethyl propylene sulfonate; (2) according to (4 ~ 2): the mol ratio of (6 ~ 8) takes the methylacryoyloxyethyl-N obtained of step (1) respectively, and N-dimethyl propylene sulfonate and acrylamide, pass into N after adding dissolution with solvents
2deoxygenation 0.5 ~ 1h, is warming up to 50 ~ 70 DEG C simultaneously, adds initiator for reaction 4 ~ 6h, obtains 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 mass ratio of dimethylaminoethyl methacrylate and PS is 2.5:1 ~ 8:1.
6. according to water-base drilling fluid according to claim 4, it is characterized in that: PS to be added drop-wise in dimethylaminoethyl methacrylate or directly disposablely to join in dimethylaminoethyl methacrylate in step (1).
7. according to water-base drilling fluid according to claim 6, it is characterized in that: adopt and directly disposablely add the fashionable dimethylaminoethyl methacrylate that takes and PS mass ratio is 5.2:1 ~ 7.8:1.
8. according to water-base drilling fluid according to claim 6, it is characterized in that: during employing dropping mode, dimethylaminoethyl methacrylate and PS mass ratio are 2.5:1 ~ 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, 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, total monomer 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 0.3% ~ 0.5% of monomer total mass.
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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