CN113969146A - Preparation and application methods and application of barium sulfate dispersion liquid - Google Patents
Preparation and application methods and application of barium sulfate dispersion liquid Download PDFInfo
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- CN113969146A CN113969146A CN202010711882.8A CN202010711882A CN113969146A CN 113969146 A CN113969146 A CN 113969146A CN 202010711882 A CN202010711882 A CN 202010711882A CN 113969146 A CN113969146 A CN 113969146A
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- barium sulfate
- dispersion liquid
- oil
- drilling fluid
- barium
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 title claims abstract description 103
- 239000006185 dispersion Substances 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 15
- 238000002360 preparation method Methods 0.000 title claims description 6
- 238000005553 drilling Methods 0.000 claims abstract description 67
- 239000012530 fluid Substances 0.000 claims abstract description 52
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 15
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 15
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229910001626 barium chloride Inorganic materials 0.000 claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000003966 growth inhibitor Substances 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000003921 oil Substances 0.000 claims description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 15
- CNQGBTJIGDAYTK-UHFFFAOYSA-N 4-ethylnonanoic acid Chemical compound CCCCCC(CC)CCC(O)=O CNQGBTJIGDAYTK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000002199 base oil Substances 0.000 claims description 8
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 8
- JIMXXGFJRDUSRO-UHFFFAOYSA-N adamantane-1-carboxylic acid Chemical compound C1C(C2)CC3CC2CC1(C(=O)O)C3 JIMXXGFJRDUSRO-UHFFFAOYSA-N 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- 239000012267 brine Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 3
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 3
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000003225 biodiesel Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 125000003158 alcohol group Chemical group 0.000 claims 1
- 239000002283 diesel fuel Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000012065 filter cake Substances 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000001965 increasing effect Effects 0.000 abstract description 4
- 230000001050 lubricating effect Effects 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 239000002270 dispersing agent Substances 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000011161 development Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000005764 inhibitory process Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000010428 baryte Substances 0.000 description 5
- 229910052601 baryte Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 229910052949 galena Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
-
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/26—Oil-in-water emulsions
-
- 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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Lubricants (AREA)
Abstract
The barium sulfate is prepared by using barium chloride and sodium sulfate solution precipitation, the size of the barium sulfate is controlled by using the crystal growth inhibitor, a dispersion liquid system which is easier to disperse in a dispersing agent and keeps an ultrafine form is formed, and the barium sulfate is finally used in drilling fluid to weight the system, so that the weight increasing effect is improved, formation pores and microcracks are blocked, the quality of a filter cake is improved, the filtration loss of the drilling fluid is reduced, the stability of a well wall is improved, the lubricating property of the drilling fluid can be improved, and the mechanical drilling speed is improved.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a preparation method and an application method of barium sulfate dispersion liquid and application thereof.
Background
Since the 70 s in the 20 th century, development and application of a drilling fluid treating agent in China are more and more emphasized to meet the requirement of maintaining and treating the performance of the drilling fluid and ensure that the drilling fluid can be safely and smoothly drilled under complex conditions, and the transition from foreign introduction to independent development and development of a special treating agent, particularly the development and application of a polymer treating agent, is gradually realized, so that the development foundation of the low-solid-phase non-dispersible drilling fluid is laid. In recent years, with the application of oil-based drilling fluid in shale gas horizontal wells and strong water-sensitive strata, oil-based drilling fluid treating agents are rapidly developed, treating agents such as oil-based drilling fluid emulsifying agents, filtrate reducer, viscosifiers and plugging agents are developed in a few years, and the oil-based drilling fluid technology in China gradually becomes mature.
In general, through the development of nearly 50 years, the drilling fluid treating agent in China basically meets the requirements of drilling fluid in drilling construction under various complex conditions, the research on various synthetic materials, natural material modification and novel surfactant treating agents is deeper, the application of industrial and agriculture and forestry processing byproducts is more important, and particularly, the special treating agent for the ultrahigh-temperature and ultrahigh-density drilling fluid has a better effect in the application [1 ]. Although the drilling fluid treating agent in China gradually catches up with the international advanced level, the treating agent still has some gaps compared with foreign oil field technical service companies, particularly, along with the increasing complexity of drilling stratums, deep well ultra-deep wells, deep water oil and gas wells, unconventional wells and the like, in order to better meet the requirements of drilling construction on the drilling fluid under complex conditions, the performance of the existing drilling fluid treating agent is continuously improved, and a novel treating agent is developed.
With the progress of drilling fluid technology, the control level of the content of bentonite and low-density solid phase in the drilling fluid is higher and higher, especially the inhibition of the drilling fluid is gradually enhanced, and the phenomena of increased viscosity and shear force and poor rheological property of the drilling fluid caused by the bentonite are less and less, so that the dosage of the viscosity reducer is less and less. From the aspect of improving the drilling fluid inhibition, compounds for strengthening the drilling fluid inhibition are more and more emphasized, and the traditional treating agent which achieves the effects of increasing viscosity, coating, flocculating, reducing fluid loss and the like by improving the relative molecular mass is gradually developed into a low-molecular polymer which mainly has strong group thermal stability, strong hydrolytic stability and strong adsorption and hydration capacities. Future viscosifiers, shear enhancing agents and the like form a space grid structure through effective adsorption among treating agents, clay or solid-phase particles and treating agent molecules, so that the drilling fluid has good shear thinning property, good thixotropy and low limit (water hole) viscosity are given to the drilling fluid, and the water power of the drill bit is effectively exerted. The coated flocculant can control hydration and dispersion of clay and rock debris by strong adsorption, hydrophobic film formation and strong inhibition at multiple points, so as to ensure cleanness of the drilling fluid. The filtrate reducer requires low viscosity effect, does not generate adverse effect on rheological property of the drilling fluid, and is beneficial to improving the inhibitive performance and the lubricating performance of the drilling fluid and improving the quality of filter cakes. While the inhibition of the drilling fluid loss additive is enhanced, the inhibitor with good compatibility also becomes one of the treatment agents with the largest future dosage.
In terms of modification of natural materials, the application effect of the modified natural materials in the drilling fluid is improved by changing the properties and the number of the adsorption groups and the hydration groups, the thermal stability of the treating agent is improved by means of structural rearrangement, molecular modification and the like, the service cycle is prolonged, and the application range is expanded. The raw materials for producing the treating agent are prepared through reactions such as hydrolysis, degradation and the like of natural materials, and the treating agent with low cost and environmental protection is developed. The utilization of industrial waste materials and agriculture and forestry processing byproducts aims at environmental protection and resource direction, aims at developing green and environment-friendly products, develops a novel low-cost treating agent, and prepares products for shale inhibition, leakage prevention and stoppage, filtration loss reduction, viscosity reduction, lubrication, anti-blocking, emulsification, plugging and the like through different separation and purification processes and chemical reactions on the premise of improving the performance of the existing treating agent.
With the continuous development of high-temperature and high-pressure, large-displacement wells, slim-hole coiled tubing drilling wells, oil-through-tubing rotary drilling wells and ultra-deep wells, the drilling process must be suitable for narrow density windows and equivalent circulating density control, so that the drilling fluid must have good rheological property and good sedimentation stability, and must meet the environmental protection requirements and have the characteristic of reducing the damage to oil and gas reservoirs. At present, the solid weighting agent mainly comprises galena powder, iron ore powder, barite, limestone, micro ferrotitanium and micro manganese. Conventional high-density weighting materials such as barite and iron ore powder have the problems of poor settling stability, high plastic viscosity and the like in weighting high-density drilling fluid, are easy to aggregate and deposit, cause the increase of drilling friction resistance, even block drilling, and can not meet the requirement of high-density drilling, and the barite can generate free barium with high biological toxicity in formate. Researchers began to research the high-density micro-powder weighting agent from the 70 s of the 20 th century, because the micro-powder weighting agent has higher specific surface area and better suspension property, the plastic viscosity and the low shear rate viscosity of the drilling fluid can be reduced, and the friction and the erosion to a drilling tool can be reduced. The micro powder weighting agent researched at first is mainly the superfine barite, but with the development of deep wells and ultra-deep wells, the application range of formate drilling fluid is wider and more, the environmental protection requirement is stricter and the application range of the superfine barite is limited more and more.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method, an application method and application of barium sulfate dispersion liquid, wherein the technical scheme is as follows:
a process for preparing barium sulfate dispersion liquid includes adding barium sulfate into water or base oil, dispersing to obtain barium sulfate dispersion liquid, depositing barium sulfate and sodium sulfate solution, and adding crystal growth inhibitor into barium chloride and sodium sulfate solution.
Further, the base oil is diesel.
Further, the base oil is one or a combination of several of biodiesel and white oil.
Further, a method for preparing a barium sulfate dispersion, comprising the steps of:
mixing barium chloride and a sodium sulfate solution in a container;
adding a crystal growth inhibitor into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
adding the dried sample into water or base oil, adding a dissolving accelerator, and carrying out ultrasonic treatment to prepare a barium sulfate dispersion liquid.
Further, when the crystal growth inhibitor is added into the mixture of barium chloride and sodium sulfate, the volume ratio of the barium chloride to the sodium sulfate is 50: 50. The dissolution promoter is one or a composition of more of polyvinyl alcohol, sodium dodecyl benzene sulfonate and tween 20. The crystal growth inhibitor is an alcoholic solution of 1-adamantanecarboxylic acid or 4-ethylnonanoic acid. The alcoholic solution of 1-adamantane carboxylic acid or 4-ethyl nonanoic acid is prepared by adding 1-adamantane carboxylic acid or 4-ethyl nonanoic acid into one or more of ethanol, n-propanol, n-butanol and glycerol.
The application of the barium sulfate dispersion liquid comprises the following steps: the water-oil-based oil-water-based drilling fluid can be used as a brine weighting agent in a water-based drilling fluid, or used as a weighting agent in an oil-based drilling fluid, or used as brine for adjusting the oil-water ratio in the oil-based drilling fluid.
Further, an application method of the barium sulfate dispersion liquid is that the barium sulfate dispersion liquid is added into the oil-based drilling fluid in a spraying mode when being used as brine for adjusting the oil-water ratio.
The invention has the beneficial effects that:
the invention utilizes the crystal inhibitor to control the size and the shape of barium sulfate, forms a dispersion liquid system which is easier to disperse in a dispersing agent and keeps the superfine shape, can improve the weighting effect, plugs formation pores and microcracks, improves the quality of filter cakes, reduces the filtration loss of drilling fluid, improves the stability of a well wall, and simultaneously can improve the lubricating property of the drilling fluid and the mechanical drilling speed.
Drawings
Fig. 1 is a scanning electron microscope image of barium sulfate particles.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the examples.
Example 1
Mixing barium chloride and a sodium sulfate solution in a container;
adding 1-adamantane carboxylic acid containing n-butanol into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
adding the dried sample into water, adding Tween 20, and performing ultrasonic treatment to prepare barium sulfate dispersion.
And adding barium sulfate dispersion liquid according to the density of the water-based drilling fluid, and continuously measuring the density change until the density meets the requirement.
Example 2
Mixing barium chloride and a sodium sulfate solution in a container;
adding 4-ethyl nonanoic acid containing n-propanol into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
and adding the dried sample into water, adding sodium dodecyl benzene sulfonate, and performing ultrasonic treatment to prepare a barium sulfate dispersion liquid.
And adding barium sulfate dispersion liquid according to the density of the water-based drilling fluid, and continuously measuring the density change until the density meets the requirement.
Example 3
Mixing barium chloride and a sodium sulfate solution in a container;
adding 4-ethyl nonanoic acid containing n-propanol into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
and adding the dried sample into white oil, adding sodium dodecyl benzene sulfonate, and performing ultrasonic treatment to prepare a barium sulfate dispersion liquid.
And adding the barium sulfate dispersion liquid according to the density of the oil-based drilling fluid, and continuously measuring the density change until the density meets the requirement.
Example 4
Mixing barium chloride and a sodium sulfate solution in a container;
adding 4-ethyl nonanoic acid containing ethanol into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
and adding the dried sample into water, adding sodium dodecyl benzene sulfonate, and performing ultrasonic treatment to prepare a barium sulfate dispersion liquid.
And adding the barium sulfate dispersion liquid by adopting a spraying method according to the oil-water ratio of the oil-based drilling fluid, and continuously measuring the change of the oil-water ratio until the oil-water ratio reaches the requirement.
And (3) performance testing:
referring to the scanning electron microscope image of barium sulfate particles shown in fig. 1 and the following table, the particle size of the barium sulfate particles varies with the crystal inhibitor during the implementation of the embodiment as follows:
| concentration of Crystal inhibitor (mol. l)-1） | Barium sulfate size (nm) |
| 0.01 | 320 |
| 0.03 | 276 |
| 0.05 | 201 |
| 0.1 | 183 |
| 0.2 | 101 |
| 0.4 | 41 |
| 0.6 | 12 |
In example 1, after the barium sulfate dispersion was added to the drilling fluid base slurry, the API fluid loss was reduced by 10% compared to that before the addition, the lubricity was improved by 10%, and the rheological effect was negligible.
The principle of the invention is that barium sulfate is prepared by using barium chloride and sodium sulfate solution precipitation, the size of barium sulfate is controlled by using a crystal growth inhibitor, a dispersion liquid system which is easier to disperse in a dispersing agent and keeps an ultrafine form is formed, and the barium sulfate is finally used in drilling fluid to weight the system, thereby improving the weighting effect, plugging formation pores and microcracks, improving the quality of filter cakes, reducing the filtration loss of the drilling fluid, improving the stability of a well wall, simultaneously improving the lubricating property of the drilling fluid and improving the mechanical drilling speed.
Claims (12)
1. A preparation method of a barium sulfate dispersion liquid comprises the step of adding barium sulfate into water or base oil for dispersion to prepare the barium sulfate dispersion liquid, and is characterized in that barium sulfate is prepared by precipitation of barium chloride and a sodium sulfate solution, and a crystal growth inhibitor is added into the barium chloride and the sodium sulfate solution in the preparation process.
2. The method according to claim 1, wherein the base oil is diesel oil.
3. The method for preparing a barium sulfate dispersion liquid according to claim 1, wherein the base oil is one or a combination of biodiesel and white oil.
4. The method for preparing a barium sulfate dispersion liquid according to any one of claims 1 to 3, comprising the steps of:
mixing barium chloride and a sodium sulfate solution in a container;
adding a crystal growth inhibitor into the mixed solution;
stirring by using a stirrer;
centrifuging the sample after precipitation, washing in a mixture of ethanol and water, and drying in a low temperature oven;
adding the dried sample into water or base oil, adding a dissolving accelerator, and carrying out ultrasonic treatment to prepare a barium sulfate dispersion liquid.
5. The method according to claim 4, wherein the volume ratio of the barium chloride to the sodium sulfate mixture is 50:50 when the crystal growth inhibitor is added.
6. The method for preparing a barium sulfate dispersion liquid according to claim 4, wherein the dissolution promoter is one or a combination of polyvinyl alcohol, sodium dodecyl benzene sulfonate and tween-20.
7. The method for preparing a barium sulfate dispersion liquid according to any one of claims 1 to 3 or 5 to 6, wherein said crystal growth inhibitor is an alcohol solution of 1-adamantanecarboxylic acid or 4-ethylnonanoic acid.
8. The method for preparing a barium sulfate dispersion liquid according to claim 7, wherein the alcoholic solution of 1-adamantanecarboxylic acid or 4-ethylnonanoic acid is prepared by adding 1-adamantanecarboxylic acid or 4-ethylnonanoic acid to one or more of ethanol, n-propanol, n-butanol, and glycerol.
9. The use of a barium sulfate dispersion as a brine weighting agent in water-based drilling fluids.
10. The use of a barium sulfate dispersion as a weighting agent in an oil based drilling fluid.
11. The application of the barium sulfate dispersion is characterized in that the barium sulfate dispersion can be used as brine in oil-based drilling fluid to adjust the oil-water ratio.
12. An application method of a barium sulfate dispersion is characterized in that the barium sulfate dispersion is added into an oil-based drilling fluid in a spraying mode when being used as brine for adjusting the oil-water ratio.
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20220125 |