CN102863584B - Preparation method for macromolecule emulsion coating agent for drilling fluid - Google Patents
Preparation method for macromolecule emulsion coating agent for drilling fluid Download PDFInfo
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- CN102863584B CN102863584B CN201210375160.5A CN201210375160A CN102863584B CN 102863584 B CN102863584 B CN 102863584B CN 201210375160 A CN201210375160 A CN 201210375160A CN 102863584 B CN102863584 B CN 102863584B
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- acrylamide
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Abstract
The invention discloses a preparation method for a macromolecule emulsion coating agent for a drilling fluid. The mass ratio of a potassium acrylate aqueous solution, a 2-acrylamide-2-methpropanesulfonic acid potassium salt aqueous solution, a 50% acrylamide aqueous solution, white oil, an emulsifying agent SP-80 and a 8% ethylene diamine tetraacetic acid (EDTA) aqueous solution is (25-30): (5-10): (30-40): (23-28): (2.5-3.0): (0.5-1.0). The potassium acrylate aqueous solution, the 2-acrylamide-2-methpropanesulfonic acid potassium salt aqueous solution, the 50% acrylamide aqueous solution, the white oil, the emulsifying agent SP-80 and the 8% ethylene diamine tetraacetic acid (EDTA) aqueous solution are emulsified in a reacting kettle, the reacting kettle is placed in water bath to be subjected to water-bath heating until the temperature reaches to 40 DEG C, and 0.5%o hydrogen peroxide is dropwise added in the reacting kettle until the reaction is finished. The macromolecule emulsion coating agent prepared by the method has the advantages that the macromolecule emulsion coating agent has good coating capability, inhibitive capability, thermostability, salt-resistant and anti-pollution capabilities and lubricating capacity, the coefficient of friction resistance of a mud cake can be effectively reduced, the emulsion particle size is equal to the size of general pore space of low-permeability and ultra-low permeability oil fields, the plugging is effective, the protective effect on an oil layer is evident, the discharge is easy, damage to the oil layer is absent, and the macromolecule emulsion coating agent is suitable for water base and oil base drilling fluid systems.
Description
Technical field
The present invention relates to the preparation method of macromolecule emulsion coating agent for a kind of drilling fluid.
Background technology
Development along with drilling technique, the various highly difficult well locations such as high angle hole, horizontal well, expansion well, extended reach well and directional inclination well are also in continuous increase, to stabilizing borehole, prevent from caving in, suppress drilling cuttings aquation and disperse, improve the aspects such as drilling speed and also had higher requirement.Original conventional coating agent can not meet the requirement of site operation.
Summary of the invention
Technical problem to be solved by this invention is to provide the preparation method of macromolecule emulsion coating agent for a kind of drilling fluid; Its rejection of macromolecule emulsion coating agent, the lubricity that make are good, Heat stability is good, non-environmental-pollution.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:
A preparation method for macromolecule emulsion coating agent for drilling fluid, comprises the following steps:
(1) raw material is prepared: in temperature, be no more than under the condition of 35 ℃, with 50%(wt%) that acrylic acid pH value is adjusted to the 8.5 formation potassium acrylate aqueous solution is standby for potassium hydroxide, get 2-acrylamide-2-methyl propane sulfonic and be mixed with 50%(wt%) the aqueous solution and with 50%(wt%) that pH value is adjusted to the 8.5 formation 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution is standby for potassium hydroxide, get acrylamide and be mixed with 50%(wt%) the aqueous solution standby;
(2) by the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50%(wt%) acrylamide solution, white oil, emulsifying agent SP-80,8%(wt%) the EDTA aqueous solution is that the ratio of 25 ~ 30:5 ~ 10:30 ~ 40:23 ~ 28:2.5 ~ 3.0:0.5～1.0 adds in reactor in mass ratio;
(3) with nitrogen, the air in reactor is driven out of, turn on agitator, rapid stirring carries out emulsification;
(4), after emulsification, reactor is put into water-bath heating in water bath;
(5) when the feed temperature in reactor rises to 40 ℃, stop heating, in reactor, drip 5/10000ths hydrogen peroxide, add for the first time 2, observe feed temperature rising situation, use the whether wire drawing of dry doigte feed liquid, as wire drawing, when feed temperature no longer rises simultaneously, add again 4 hydrogen peroxide, with the whether wire drawing of dry doigte feed liquid, the like strengthen gradually the addition of hydrogen peroxide, by the time temperature no longer rise and feed liquid no longer during wire drawing reaction finish.
The preparation method of macromolecule emulsion coating agent for above-mentioned drilling fluid, adds the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50%(wt% in described reactor) mass ratio of acrylamide solution, white oil, emulsifying agent SP-80, the 8%EDTA aqueous solution is 28:7.5:35:26:2.8:0.7.
Drilling fluid prepared by method of the present invention has the following advantages with macromolecule emulsion coating agent:
1) increasing considerably of molecular weight, has improved coated property, inhibition, thermostability and the anti-salt pollution capacity of product, and drilling fluid rheology is improved greatly;
2) high molecular weight, the adsorption group of suitable proportion, the synergy of aquation group and cation group, make macromolecule emulsion coating agent there is good rheological, building capacity and caving-preventing ability, good coated property, inhibition and anti-salt pollution capacity and certain thermostability and leak-off controllability;
3) contain a large amount of drilling fluid lubricating compositions, have good lubricity, alternative oil lubricant, can effectively reduce the coefficient of friction resistance of mud cake;
4) emulsion granularity is little, basic with hypotonic identical with general pore dimension Oil in Super-low Permeability oil field, is easy to be squeezed in nano level space form shutoff, so shutoff is more effective, oil layer protection effect is obvious;
5) this product is easy to use, can be directly used in situ of drilling well preparation drilling fluid, is applicable to water base, oil base drilling fluid system;
6), because emulsion is Water in Oil emulsion, the risk that does not exist emulsion to stop up, is easy to anti-row, can not damage oil reservoir.
Embodiment
For clearer explanation technical scheme of the present invention, below specific embodiment the present invention will be further described in detail.
The preparation method of macromolecule emulsion coating agent for drilling fluid of the present invention, comprises the following steps:
(1) raw material is prepared: in temperature, be no more than under the condition of 35 ℃, with 50%(wt%) that acrylic acid pH value is adjusted to the 8.5 formation potassium acrylate aqueous solution is standby for potassium hydroxide, get 2-acrylamide-2-methyl propane sulfonic and be mixed with 50%(wt%) the aqueous solution and with 50%(wt%) that pH value is adjusted to the 8.5 formation 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution is standby for potassium hydroxide; get acrylamide and be mixed with 50%(wt%) the aqueous solution standby
(2) by the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50%(wt%) acrylamide solution, white oil, emulsifying agent SP-80,8%(wt%) the EDTA aqueous solution is that the ratio of 25 ~ 30:5 ~ 10:30 ~ 40:23 ~ 28:2.5 ~ 3.0:0.5～1.0 adds in reactor in mass ratio;
(3) with nitrogen, the air in reactor is driven out of, turn on agitator, rapid stirring carries out emulsification;
(4), after emulsification, reactor is put into water-bath heating in water bath;
(5) when the feed temperature in reactor rises to 40 ℃, stop heating, in reactor, drip 5/10000ths hydrogen peroxide, add for the first time 2, observe feed temperature rising situation, use the whether wire drawing of dry doigte feed liquid, as wire drawing, when feed temperature no longer rises simultaneously, add again 4 hydrogen peroxide, with the whether wire drawing of dry doigte feed liquid, the like strengthen gradually the addition of hydrogen peroxide, by the time temperature no longer rise and feed liquid no longer during wire drawing reaction finish.
Preferably, adding the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50% acrylamide solution, white oil, emulsifying agent SP-80, the 8%(wt% in described reactor) mass ratio of the EDTA aqueous solution is 28:7.5:35:26:2.8:0.7.
1. macromolecule emulsion coating agent performance evaluation for the drilling fluid that prepared by method of the present invention:
Fresh water experimental formula: 4% base slurry+1% drilling fluid macromolecule emulsion coating agent.
Described 4% base slurry, for adding 4 grams of sodium bentonites in every 100 ml waters, is made base slurry through 24 hours aquations at ambient temperature.Described 1% drilling fluid is in quality percent by volume with macromolecule emulsion coating agent, in every 100 milliliters of bases slurry, adds 1 gram of drilling fluid macromolecule emulsion coating agent.
Two part of 4% base slurry and two parts of 1% drilling fluids that are added with that configure by fresh water experimental formula are recycled to respectively in digestion tank with the drilling fluid (being called for short application of sample slurry) of macromolecule emulsion coating agent, under 180 ℃ of conditions, heat is rolled 16h(and is reduced to 180 ℃/16h), after drilling fluid is cooled to room temperature, be recycled in clean mud cup; Add while stirring 20.0g sodium bentonite, continue to stir 10min, after curing in airtight condition 3h, put into roller heating stove, at 180 ℃, heat is rolled 16h, treat that drilling fluid is cooled to room temperature, high-speed stirring 5min, adds 4% base is starched and application of sample is starched apparent viscosity AV and the yield value YP after sodium bentonite by the measuring method test of GB/T16783 regulation, and apparent viscosity is designated as respectively AV
1, AV
2, the yield value value of reading is designated as respectively YP
1, YP
2.Molecular weight determination is with reference to GB.By formula (1), formula (2), calculate apparent viscosity degradation rate and yield value rate of descent.The indices that application of sample slurry heat under 180 ℃ of conditions is rolled before and after 16h is as shown in table 1, and application of sample slurry heat under 180 ℃ of conditions is rolled apparent viscosity rate of descent after 16h and yield value rate of descent in Table 2.
Table 1 application of sample slurry heat under 180 ℃ of conditions is rolled the indices before and after 16h
| Project | Index | Result |
| Outward appearance | White or milky emulsion | Milky emulsion |
| Non-water thing content, % | ≥55 | 77.56 |
| Application of sample slurry apparent viscosity, mPa.s | ≥30 | 54.5 |
| PH value | 6.5-7.5 | 7 |
Table 2 application of sample slurry heat under 180 ℃ of conditions is rolled apparent viscosity rate of descent and the yield value rate of descent after 16h
| Project | Index after 180 ℃/16h | Result |
| Apparent viscosity rate of descent % | ≥50 | 56.3 |
| Yield value rate of descent % | ≥65 | 76.3 |
According to the experimental data of recording in table 1, table 2, show: be added with the drilling fluid of the macromolecule emulsion coating agent requirement that can touch the mark completely for 1% drilling fluid under 180 ℃ of conditions, and there is good inhibition.
2. the performance comparison experiment of macromolecule emulsion coating agent and other coating agents for the drilling fluid that prepared by preparation method of the present invention:
Adopt respectively macromolecule emulsion coating agent, 80A51, CAL-90 and emulsion coating agent for drilling fluid prepared by preparation method of the present invention by following formulated drilling fluid, experimental formula and numbering are as follows:
1.4% base slurry+1% drilling fluid macromolecule emulsion coating agent
2.4% base slurry+0.3%80A51
3.4% base slurry+1%CAL-90
4.4% base slurry+1% emulsion coating agent
Note, all refers to quality percent by volume.
After tested, the apparent viscosity rate of descent of the drill-in fluid of tetra-kinds of formulas of 1-4 and yield value rate of descent are in Table 3;
Apparent viscosity rate of descent and the yield value rate of descent of the drilling fluid of the different coating agent preparations of table 3
By just data in 3, drawn: drilling fluid prepared by method of the present invention is suppressing to be obviously better than other like products aspect clay dispersion with macromolecule emulsion coating agent.
3. the drilling fluid that prepared by method of the present invention detects with macromolecule emulsion coating agent anti-salt property, formula and numbering following (with the metering of quality percent by volume), and test result is in Table 4.
1.4% base slurry+1% drilling fluid macromolecule emulsion coating agent
2.4% base slurry macromolecule emulsion coating agent+5%NaCl for+1% drilling fluid
3.4% base slurry macromolecule emulsion coating agent+10%NaCl for+1% drilling fluid
The salt resistance of macromolecule emulsion coating agent for table 4 drilling fluid
Data from table 4 draw, drilling fluid prepared by method of the present invention still has good inhibition with macromolecule emulsion coating agent in the base slurry being polluted by 10%NaCl, although fluid loss increases to some extent, does not affect the overall performance of drilling fluid.
4. the drilling fluid that prepared by method of the present invention is the application in drilling fluid with macromolecule emulsion coating agent:
Fill a prescription as follows, test data is in Table 5.
Drilling fluid basic recipe: 5% wilkinite+0.2% organic silicon diluent SF-260+2.3% polyester plugging agent JJFT-1+0.1% soda ash+0.1% potassium hydroxide+1%HCE+5%HCO
Experimental formula (with the metering of quality percent by volume):
1. drilling fluid basic recipe+0.1% drilling fluid macromolecule emulsion coating agent
2. drilling fluid basic recipe+0.3% drilling fluid macromolecule emulsion coating agent
3. drilling fluid basic recipe+0.5% drilling fluid macromolecule emulsion coating agent
4. drilling fluid basic recipe+0.7% drilling fluid macromolecule emulsion coating agent
Table 5 drilling fluid is the application in system with macromolecule emulsion coating agent
Test data in table 5 can draw: drilling fluid prepared by method of the present invention reduces to a certain extent fluid loss, reduction lubricating coefficient, the raising inhibition of drilling fluid system in drilling fluid with macromolecule emulsion coating agent, simultaneously along with the increase of described drilling fluid with macromolecule emulsion coating agent dosage, the viscosity of drilling fluid also increases to some extent, in practice of construction, according to practical situation, consider increase addition.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For one of ordinary skill in the art, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being extended out thus or change still belong to the protection domain of the invention.
Claims (2)
1. a preparation method for macromolecule emulsion coating agent for drilling fluid, is characterized in that, comprises the following steps:
(1) raw material is prepared: in temperature, be no more than under the condition of 35 ℃, with 50%(wt%) that acrylic acid pH value is adjusted to the 8.5 formation potassium acrylate aqueous solution is standby for potassium hydroxide, get 2-acrylamide-2-methyl propane sulfonic and be mixed with 50%(wt%) the aqueous solution and with 50%(wt%) that pH value is adjusted to the 8.5 formation 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution is standby for potassium hydroxide, get acrylamide and be mixed with 50%(wt%) the aqueous solution standby;
(2) by the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50%(wt%) acrylamide solution, white oil, emulsifying agent SP-80,8%(wt%) the EDTA aqueous solution is that the ratio of 25 ~ 30:5 ~ 10:30 ~ 40:23 ~ 28:2.5 ~ 3.0:0.5 ~ 1.0 adds in reactor in mass ratio;
(3) with nitrogen, the air in reactor is driven out of, turn on agitator, rapid stirring carries out emulsification;
(4), after emulsification, reactor is put into water-bath heating in water bath;
(5) when the feed temperature in reactor rises to 40 ℃, stop heating, in reactor, drip 5/10000ths hydrogen peroxide, add for the first time 2, observe feed temperature rising situation, use the whether wire drawing of dry doigte feed liquid, as wire drawing, when feed temperature no longer rises simultaneously, add again 4 hydrogen peroxide, with the whether wire drawing of dry doigte feed liquid, the like strengthen gradually the addition of hydrogen peroxide, by the time temperature no longer rise and feed liquid no longer during wire drawing reaction finish.
2. the preparation method of macromolecule emulsion coating agent for drilling fluid according to claim 1, it is characterized in that, add the potassium acrylate aqueous solution, the 2-acrylamide-2-methyl propane sulfonic sylvite aqueous solution, 50%(wt% in described reactor) mass ratio of acrylamide solution, white oil, emulsifying agent SP-80, the 8%EDTA aqueous solution is 28:7.5:35:26:2.8:0.7.
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| CN103724517A (en) * | 2013-12-04 | 2014-04-16 | 克拉玛依市金鑫科技有限公司 | Production method of tackifying encapsulation agent for drilling fluid |
| CN104559962A (en) * | 2013-12-06 | 2015-04-29 | 崇礼县石油科技有限公司 | Polybasic coating inhibitor for drilling fluid and preparation method thereof |
| CN103755868B (en) * | 2013-12-23 | 2016-06-08 | 郑州三山石油技术有限公司 | Shale gas slippery water pressure break friction reducer and preparation method thereof |
| CN103755869B (en) * | 2014-01-03 | 2016-04-06 | 克拉玛依市金鑫科技有限公司 | AM/AAK/AMPS terpolymer and the strong coating agent of polymer emulsion and preparation method thereof |
| CN104177542B (en) * | 2014-08-05 | 2016-09-14 | 新乡市富邦科技有限公司 | Strong coating agent of drilling fluid micro-emulsion polymerization and preparation method thereof |
| CN105294946A (en) * | 2015-11-26 | 2016-02-03 | 天津滨海新区普瑞德石油科技有限公司 | Coating agent for water-based drilling fluid |
| CN107488247B (en) * | 2017-08-25 | 2019-08-16 | 江苏师范大学 | A kind of preparation method of polymer for drilling fluid shale control agent |
| CN109021941B (en) * | 2018-09-20 | 2022-01-18 | 河北硅谷化工有限公司 | Coating flocculant for drilling fluid |
| CN110684514A (en) * | 2019-12-09 | 2020-01-14 | 东营市金美化工有限公司 | Coating agent for drilling fluid and microemulsion preparation method and application thereof |
| CN111978464A (en) * | 2020-08-26 | 2020-11-24 | 中石化石油工程技术服务有限公司 | Polyacrylamide potassium salt and preparation method and application thereof |
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| CN101805595B (en) * | 2010-04-16 | 2013-04-17 | 北京化工大学 | Synthesis method of drilling fluid filtrate reducer |
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