CN115975613B - Alpha-olefin base fluid and application thereof in drilling fluid - Google Patents
Alpha-olefin base fluid and application thereof in drilling fluid Download PDFInfo
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- CN115975613B CN115975613B CN202111198909.9A CN202111198909A CN115975613B CN 115975613 B CN115975613 B CN 115975613B CN 202111198909 A CN202111198909 A CN 202111198909A CN 115975613 B CN115975613 B CN 115975613B
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- 239000004711 α-olefin Substances 0.000 title claims abstract description 107
- 239000012530 fluid Substances 0.000 title claims abstract description 106
- 238000005553 drilling Methods 0.000 title claims abstract description 95
- 239000010451 perlite Substances 0.000 claims abstract description 35
- 235000019362 perlite Nutrition 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 229940057995 liquid paraffin Drugs 0.000 claims abstract description 11
- 239000002480 mineral oil Substances 0.000 claims abstract description 10
- 235000010446 mineral oil Nutrition 0.000 claims abstract description 10
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 22
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 claims description 20
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N 1-Heptene Chemical compound CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 claims description 18
- 239000000080 wetting agent Substances 0.000 claims description 16
- 239000003921 oil Substances 0.000 claims description 14
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical group SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 12
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 11
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 11
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 11
- 239000005642 Oleic acid Substances 0.000 claims description 11
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 11
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 9
- 239000003995 emulsifying agent Substances 0.000 claims description 9
- 239000000194 fatty acid Substances 0.000 claims description 9
- 229930195729 fatty acid Natural products 0.000 claims description 9
- 150000004665 fatty acids Chemical class 0.000 claims description 9
- 239000011297 pine tar Substances 0.000 claims description 9
- 229940068124 pine tar Drugs 0.000 claims description 9
- 239000003784 tall oil Substances 0.000 claims description 9
- 239000012267 brine Substances 0.000 claims description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- -1 polyoxyethylene Polymers 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 7
- 239000003208 petroleum Substances 0.000 abstract description 5
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- 239000004033 plastic Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 5
- 239000010428 baryte Substances 0.000 description 5
- 229910052601 baryte Inorganic materials 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
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- 238000012360 testing method Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011289 tar acid Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
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- Lubricants (AREA)
Abstract
The invention relates to an alpha-olefin base fluid and application thereof in drilling fluid. The alpha-olefin based liquid comprises linear alpha-olefin, nonionic surfactant, mineral oil and liquid paraffin. The mass ratio of the linear alpha-olefin to the nonionic surfactant to the mineral oil to the liquid paraffin is (90-100), 4-5, 8-10 and 1-2. The alpha-olefin base fluid can effectively avoid the adverse consequences of pump pressure rise, stratum fracture, well wall instability and the like caused by the rising of the viscosity of the drilling fluid due to the excessively low temperature in the drilling process. Meanwhile, the alpha-olefin drilling fluid provided by the invention also comprises perlite with a specific expansion multiple, the perlite is used as a weighting substance of the alpha-olefin drilling fluid at a low temperature, and the perlite is softened when the temperature is increased, so that the drilling fluid can keep stable viscosity at a high temperature, and further, the alpha-olefin drilling fluid provided by the invention can cope with various complex petroleum industry exploitation environments.
Description
Technical Field
The invention belongs to the technical field of drilling in the petroleum industry, and particularly relates to alpha-olefin base fluid and application thereof in drilling fluid.
Background
With the gradual prominence of energy and environmental problems and the rapid development of oil drilling technologies, there is an increasing demand for energy exploitation, particularly oil exploitation. The traditional water-based drilling fluid has a narrow application range, and is increasingly unable to meet the requirements under the current gradually complicated underground condition, and the oil-based drilling fluid is difficult to popularize and use all the time due to the fact that the oil-based drilling fluid has larger pollution to the environment and is forced to be constrained by related environmental regulations. Therefore, the synthetic base drilling fluid which is used as a substitute system of the two not only maintains the environmental protection property of the water base drilling fluid, but also well inherits the performance characteristics of the oil base drilling fluid, and becomes an indispensable drilling fluid system in the offshore complex stratum and other sensitive land area drilling processes. Reflecting according to the use condition of the site: the synthetic base drilling fluid has a series of advantages of strong sand carrying capacity, good lubricity, shale inhibition and the like, and meanwhile, the problems of environmental pollution, influence on logging and well testing data and the like of the oil base drilling fluid are effectively avoided.
The base fluid is the main component for making the drilling fluid, and the performance index of the base fluid determines most performance indexes of the drilling fluid, such as flash point, viscosity, solidifying point and the like. At present, base fluids of synthetic base drilling fluids can be divided into three types of ester base, ether base and alpha-olefin; the alpha-olefin base fluid is easy to decompose by microorganisms because double bonds are reserved at the molecular terminals, does not contain toxic aromatic hydrocarbon and cyclic hydrocarbon compounds, and has the advantages of low viscosity, low pour point, less residue on drill cuttings, low unit cost and the like compared with other base fluids, so that the alpha-olefin drilling fluid is most widely applied.
With the widespread use of alpha-olefin drilling fluids, new problems have arisen, mainly due to the fact that the alpha-olefin drilling fluid has too high a viscosity at low temperatures, and the high Wen Shi-olefin drilling fluid has too low a viscosity, particularly too low a dynamic shear force, to effectively carry the solid phase in the drilling fluid. In order to cope with various complex petroleum industry exploitation environments, it is necessary to provide an alpha-olefin drilling fluid with little viscosity change under low temperature or high temperature conditions.
Disclosure of Invention
The invention provides an alpha-olefin base fluid and application thereof in drilling fluid aiming at the defects of the prior art. The alpha-olefin drilling fluid containing the alpha-olefin base fluid can cope with various complex petroleum industry exploitation environments.
To this end, a first aspect of the present invention provides an alpha-olefin based liquid comprising a linear alpha-olefin, a nonionic surfactant, a mineral oil, and a liquid paraffin.
In some embodiments of the invention, the mass ratio of linear alpha-olefin, nonionic surfactant, mineral oil, and liquid paraffin is (90-100): 4-5): 8-10): 1-2.
In other embodiments of the present invention, the linear alpha-olefin is selected from one or more of linear alpha-olefins having 7 to 18 carbon atoms. In some embodiments of the invention, the linear alpha-olefin is selected from at least one of 1-heptene and 1-decene. In some preferred embodiments of the present invention, the linear alpha-olefin is a mixture of 1-heptene and 1-decene, wherein the mass of the 1-heptene and 1-decene in the mixture is (1-2): (1-2), preferably 1:1.
In some embodiments of the invention, the nonionic surfactant is alkylphenol ethoxylates. The alkylphenol polyoxyethylene ether selected by the invention has high chemical stability, is not easily damaged by strong acid and strong alkali even at high temperature, and further ensures that the prepared alpha-olefin-based liquid has stable property. In some preferred embodiments of the present invention, the alkyl group in the alkylphenol ethoxylates employed may be an alkyl group of 8 to 16 carbons. In some embodiments of the present invention, the alkylphenol ethoxylates used may be commercially available under the brand name OP-10, etc.
In other embodiments of the invention, the mineral oil is white oil. The white oil has the basic composition of saturated hydrocarbon structure, has the contents of aromatic hydrocarbon, nitrogen, oxygen, sulfur and other substances similar to zero, is environment-friendly, and has good oxidation stability and chemical stability.
The alpha-olefin-based liquid contains components in a specific proportion, and the alpha-olefin-based liquid is stable at low temperature by selecting the nonionic surfactant with high surface activity and the mineral oil and the liquid paraffin with extremely stable physical properties at low temperature, so that the adverse effects of pump pressure rise, stratum fracture, well wall instability and the like caused by the rising of the viscosity of the drilling fluid when the temperature is too low in the drilling process are effectively avoided.
The second aspect of the invention provides an alpha-olefin drilling fluid, which comprises the following components in parts by weight:
in some preferred embodiments of the present invention, the alpha-olefin drilling fluid comprises 90 parts by weight of the alpha-olefin base fluid according to the first aspect of the present invention, 10 parts by weight of brine, 4 parts by weight of an emulsifier, 2.5 parts by weight of a fluid loss additive, 6 parts by weight of an alkalinity regulator, 2 parts by weight of an organic soil, 2 parts by weight of a wetting agent, 20 parts by weight of perlite and 200 parts by weight of a weighting agent.
In some embodiments of the invention, the alkalinity regulator is a silicate. The silicate is selected as the alkalinity regulator, and when the silicate is used for regulating the alkalinity of the drilling fluid, the silicate cannot absorb water and expand in the use process, so that shale expansion possibly occurring in the drilling process can be avoided.
In some preferred embodiments of the invention, the alkalinity regulator is sodium metasilicate pentahydrate. Sodium metasilicate pentahydrate is selected as an alkalinity regulator, and the reason is that the sodium metasilicate pentahydrate has pH buffering capacity, so that the change of the pH value of the drilling fluid caused by environmental factors in the use process of the drilling fluid can be avoided, and the viscosity, the emulsifying performance and other physical properties of the drilling fluid are changed, thereby influencing the drilling effect.
The perlite in the alpha-olefin drilling fluid is used as a weighting substance of the alpha-olefin drilling fluid at low temperature, when the temperature is increased, the perlite is softened (the softening degree of the perlite is correspondingly changed according to the temperature), so that the drilling fluid can keep stable viscosity at high temperature, and further the disadvantages of sedimentation of weighting agent (such as barite), high circulation pressure consumption and the like caused by the reduction of the viscosity of the alpha-olefin drilling fluid due to the increase of the temperature are avoided.
In some embodiments of the invention, the expansion factor of the perlite is greater than or equal to 20. The expansion multiple of the perlite selected by the invention is more than or equal to 20, because if perlite with too low expansion multiple is adopted, the volume weight is low, and the viscosity of the drilling fluid can not be maintained when the temperature of the drilling fluid is increased.
In other embodiments of the invention, the brine is a 20 to 30wt% calcium chloride solution.
In some embodiments of the invention, the emulsifier is tall oil fatty acid.
In other embodiments of the invention, the fluid loss additive is a bitumen oxide.
In some embodiments of the invention, the wetting agent comprises pine tar and oleic acid; preferably, the mass ratio of the pine tar to the oleic acid is (5-7): 3-5; further preferably, the mass ratio of the pine tar to the oleic acid is 7:3.
In other embodiments of the invention, the weighting agent is a heavy stone.
According to a third aspect of the present invention there is provided a method of preparing an alpha-olefin drilling fluid according to the second aspect of the present invention comprising the steps of:
s1, mixing the alpha-olefin base solution, an emulsifying agent and a wetting agent according to the first aspect of the invention, and stirring to obtain a mixture 1;
s2, mixing the mixture 1 with saline water, and stirring to obtain a mixture 2;
s3, mixing the mixture 2 with an alkalinity regulator, a filtrate reducer and organic soil, and stirring to obtain a mixture 3;
s4, mixing the mixture 3 with perlite, and stirring to obtain a mixture 4;
and S5, mixing the mixture 4 with a weighting agent, and stirring to obtain the alpha-olefin drilling fluid.
In some embodiments of the present invention, the α -olefin-based liquid according to the first aspect of the present invention added in the above preparation method is 85 to 90 parts by weight, 10 to 15 parts by weight of brine, 3 to 5 parts by weight of emulsifier, 2 to 3 parts by weight of filtrate reducer, 5 to 7 parts by weight of alkalinity regulator, 2 to 3 parts by weight of organic soil, 1 to 2 parts by weight of wetting agent, 20 to 30 parts by weight of perlite, and 180 to 200 parts by weight of weighting agent.
In some preferred embodiments of the present invention, the alpha-olefin-based liquid according to the first aspect of the present invention added in the above preparation method is 90 parts by weight, brine is 10 parts, emulsifier is 4 parts, fluid loss additive is 2.5 parts, alkalinity regulator is 6 parts, organic soil is 2 parts, wetting agent is 2 parts, perlite is 20 parts, weighting agent is 200 parts.
In some embodiments of the invention, the alkalinity regulator is a silicate. The silicate is selected as the alkalinity regulator, and when the silicate is used for regulating the alkalinity of the drilling fluid, the silicate cannot absorb water and expand in the use process, so that shale expansion possibly occurring in the drilling process can be avoided.
In some preferred embodiments of the invention, the alkalinity regulator is sodium metasilicate pentahydrate. Sodium metasilicate pentahydrate is selected as an alkalinity regulator, and the reason is that the sodium metasilicate pentahydrate has pH buffering capacity, so that the change of the pH value of the drilling fluid caused by environmental factors in the use process of the drilling fluid can be avoided, and the viscosity, the emulsifying performance and other physical properties of the drilling fluid are changed, thereby influencing the drilling effect.
The perlite added in the method is used as a weighting substance of the alpha-olefin drilling fluid at low temperature, and when the temperature is increased, the perlite is softened (the softening degree of the perlite is correspondingly changed according to the temperature), so that the viscosity of the drilling fluid can be kept stable at high temperature, and further the disadvantages of sedimentation of the weighting agent (such as barite), high circulation pressure consumption and the like caused by the reduction of the viscosity of the alpha-olefin drilling fluid due to the increase of the temperature are avoided.
In some embodiments of the invention, the expansion factor of the perlite is greater than or equal to 20. The expansion multiple of the perlite selected by the invention is more than or equal to 20, because if perlite with too low expansion multiple is adopted, the volume weight is low, and the viscosity of the drilling fluid can not be maintained when the temperature of the drilling fluid is increased.
In other embodiments of the invention, the brine is a 20 to 30wt% calcium chloride solution.
In some embodiments of the invention, the emulsifier is tall oil fatty acid.
In other embodiments of the invention, the fluid loss additive is a bitumen oxide.
In some embodiments of the invention, the wetting agent comprises pine tar and oleic acid; preferably, the mass ratio of the pine tar to the oleic acid is (5-7): 3-5; further preferably, the mass ratio of the pine tar to the oleic acid is 7:3.
In other embodiments of the invention, the weighting agent is a heavy stone.
In some embodiments of the invention, the stirring time in step S1 is 5 to 10 minutes.
In other embodiments of the present invention, the stirring time in step S2 is 15 to 20 minutes.
In some embodiments of the invention, the agitation times in steps S3 and S4 are each independently 10 to 15 minutes.
In other embodiments of the present invention, the stirring time in step S5 is 20 to 25 minutes.
The beneficial effects of the invention are as follows: the alpha-olefin base fluid provided by the invention contains components with a specific proportion, and by selecting the nonionic surfactant with high surface activity and the mineral oil and the liquid paraffin with extremely stable physical properties at low temperature, the alpha-olefin base fluid is stable at low temperature, so that the alpha-olefin drilling fluid containing the alpha-olefin base fluid can effectively avoid adverse effects of pump pressure rising, stratum fracture, well wall instability and the like caused by the rising of the viscosity of the drilling fluid when the temperature is too low in the drilling process. Meanwhile, the alpha-olefin drilling fluid provided by the invention also comprises perlite with a specific expansion multiple, the perlite is used as a weighting substance of the alpha-olefin drilling fluid at a low temperature, when the temperature is increased, the perlite is softened, and the softening degree of the perlite is correspondingly changed according to the temperature, so that the stable viscosity of the drilling fluid at a high temperature can be maintained, and the disadvantages of heavy spar sedimentation, high circulation pressure consumption and the like caused by the viscosity reduction of the alpha-olefin drilling fluid due to the temperature increase are avoided. That is, by containing specific alpha-olefin base fluids and perlite, the alpha-olefin drilling fluids of the present invention are able to cope with a variety of complex petroleum industry exploitation environments.
Detailed Description
In order that the invention may be more readily understood, the invention will be further described in detail with reference to the following examples, which are given by way of illustration only and are not limiting in scope of application. The starting materials or components used in the present invention may be prepared by commercial or conventional methods unless specifically indicated.
In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The alkylphenol ethoxylates used in the examples below were identified by the trade name OP-10.
Example 1
(1) Preparing alpha-olefin base liquid:
mixing linear alpha-olefin, OP-10 (alkylphenol ethoxylate), white oil and liquid paraffin according to a mass ratio of 100:5:9:2, and uniformly stirring to obtain alpha-olefin base solution; wherein the linear alpha-olefin is prepared from 1-heptene and 1-decene according to a mass ratio of 1:1.
(2) Preparing alpha-olefin drilling fluid:
firstly, 90 parts of alpha-olefin base solution prepared in the step (1), 10 parts of 20wt% calcium chloride solution, 4 parts of tall oil fatty acid, 2.5 parts of oxidized asphalt, 6 parts of sodium metasilicate pentahydrate, 2 parts of organic soil, 2 parts of wetting agent, 20 parts of perlite (expansion multiple is 20) and 200 parts of barite are weighed, wherein the lubricant is obtained by mixing loose tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin-based liquid prepared in the step (1) into a stirrer for stirring, adding tall oil fatty acid and a wetting agent, and continuing stirring for 10min; adding 20wt% calcium chloride solution, and stirring for 15min; adding sodium metasilicate pentahydrate, oxidized asphalt and organic soil, and stirring for 10min; adding perlite, and stirring for 15min; and finally adding the heavy crystal stone, and stirring for 25min to obtain the alpha-olefin drilling fluid.
Example 2
(1) Preparing alpha-olefin base liquid:
mixing 1-decene, OP-10 (alkylphenol ethoxylate), white oil and liquid paraffin according to a mass ratio of 95:4.5:10:1, and uniformly stirring to obtain the alpha-olefin base solution.
(2) Preparing alpha-olefin drilling fluid:
firstly, weighing 85 parts of alpha-olefin base solution prepared in the step (1), 15 parts of 25wt% calcium chloride solution, 5 parts of tall oil fatty acid, 3 parts of asphalt oxide, 7 parts of sodium metasilicate pentahydrate, 2 parts of organic soil, 1 part of wetting agent, 20 parts of perlite (expansion multiple of 20) and 180 parts of barite, wherein the lubricant is obtained by mixing pine tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin-based liquid prepared in the step (1) into a stirrer for stirring, adding tall oil fatty acid and a wetting agent, and continuing stirring for 5min; adding 25wt% calcium chloride solution, and stirring for 20min; adding sodium metasilicate pentahydrate, oxidized asphalt and organic soil, and stirring for 15min; adding perlite, and stirring for 10min; and finally adding the heavy crystal stone, and stirring for 20min to obtain the alpha-olefin drilling fluid.
Example 3
(1) Preparing alpha-olefin base liquid:
mixing linear alpha-olefin, OP-10 (alkylphenol ethoxylate), white oil and liquid paraffin according to a mass ratio of 90:4:8:1.5, and uniformly stirring to obtain alpha-olefin base solution; wherein the linear alpha-olefin is prepared from 1-heptene and 1-decene according to a mass ratio of 1:1.
(2) Preparing alpha-olefin drilling fluid:
88 parts of alpha-olefin-based liquid prepared in the step (1), 12 parts of 20wt% calcium chloride solution, 3 parts of tall oil fatty acid, 2 parts of asphalt oxide, 5 parts of sodium metasilicate pentahydrate, 3 parts of organic soil, 1.5 parts of wetting agent, 25 parts of perlite (expansion multiple of 20) and 200 parts of barite are weighed, wherein the lubricant is obtained by mixing loose tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin-based liquid prepared in the step (1) into a stirrer for stirring, adding tall oil fatty acid and a wetting agent, and continuing stirring for 8min; adding 20wt% calcium chloride solution, and stirring for 15min; adding sodium metasilicate pentahydrate, oxidized asphalt and organic soil, and stirring for 13min; adding perlite, and stirring for 15min; and finally adding the heavy crystal stone, and stirring for 22min to obtain the alpha-olefin drilling fluid.
Example 4
Substantially the same as in example 1, except that the weight part of the alpha-olefin base fluid added during the preparation of the alpha-olefin drilling fluid was 85 parts.
Example 5
Substantially the same as in example 1, except that the weight part of the alpha-olefin base fluid added during the preparation of the alpha-olefin drilling fluid was 80 parts.
Comparative example 1
Essentially the same as in example 1, except that perlite was not added during the formulation of the alpha olefin drilling fluid.
Comparative example 2
Substantially the same as in example 1, except that expansion ratio of perlite added during the preparation of alpha-olefin drilling fluid was 10.
Comparative example 3
Substantially the same as in example 1, except that the mixture obtained by directly preparing 1-heptene and 1-decene in a mass ratio of 1:1 was an alpha-olefin-based liquid.
Test example 1
The properties of the alpha-olefin drilling fluids prepared in examples 1 to 5 and comparative examples 1 to 3 were tested to determine the properties of the alpha-olefin drilling fluids at 20℃and 50℃respectively. Part 2 of the field test of drilling fluids for oil and gas industry according to GB/T16783.2-2012: oil-based drilling fluids were measured for Apparent Viscosity (AV), plastic Viscosity (PV), yield value (YP) and dynamic to plastic ratio, and the measurement results are shown in table 1.
TABLE 1
As can be seen from Table 1, the alpha-olefin drilling fluids prepared in examples 1-5 of the present invention have little change in plastic viscosity and stable properties at different temperatures. The plastic viscosity of the alpha-olefin drilling fluid prepared in the comparative example 1 is greatly reduced under the high temperature condition, the dynamic plastic ratio is also reduced to 0.26, and the plastic viscosity is also reduced after the comparative example 2 is subjected to high temperature; the plastic viscosity of the alpha-olefin drilling fluid prepared in the comparative example 3 is greatly improved under the low temperature condition, which shows that the viscosity of the base fluid obtained by simply taking the alpha-olefin as the raw material is not stable under the low temperature condition.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (12)
1. An alpha-olefin based liquid comprising a linear alpha-olefin, a nonionic surfactant, a mineral oil, and a liquid paraffin; the mass ratio of the linear alpha-olefin to the nonionic surfactant to the mineral oil to the liquid paraffin is (90-100), 4-5, 8-10 and 1-2;
the linear alpha-olefin is selected from one or more of linear alpha-olefins with 7-10 carbon atoms;
the nonionic surfactant is alkylphenol polyoxyethylene;
the mineral oil is white oil.
2. The alpha-olefin based liquid according to claim 1, characterized in that the linear alpha-olefin is selected from 1-heptene and/or 1-decene.
3. The alpha-olefin-based liquid according to claim 2, wherein when the linear alpha-olefin is a mixture of 1-heptene and 1-decene, the mass ratio of 1-heptene to 1-decene is (1-2): 1-2.
4. The alpha-olefin base fluid according to any one of claims 1 to 3, wherein the alkyl group in the alkylphenol ethoxylate is an alkyl group having 8 to 16 carbon atoms.
5. An alpha-olefin drilling fluid comprises the following components in parts by weight:
the alkalinity regulator is silicate;
the expansion multiple of the perlite is more than or equal to 20.
6. The alpha olefin drilling fluid of claim 5 wherein the alkalinity regulator is sodium metasilicate pentahydrate.
7. The alpha olefin drilling fluid of claim 5 wherein the brine is a 20 to 30wt% calcium chloride solution; and/or
The emulsifier is tall oil fatty acid; and/or
The filtrate reducer is oxidized asphalt.
8. The alpha olefin drilling fluid of any one of claims 5-7 wherein the wetting agent comprises pine tar and oleic acid; and/or
The weighting agent is a heavy stone.
9. An alpha-olefin drilling fluid according to any one of claims 5-7, characterized in that the mass ratio of pine tar to oleic acid in the wetting agent is (5-7): 3-5.
10. The alpha olefin drilling fluid of any one of claims 5-7, comprising the following components: 90 parts of alpha-olefin base solution, 10 parts of brine, 4 parts of emulsifier, 2.5 parts of filtrate reducer, 6 parts of alkalinity regulator, 2 parts of organic soil, 2 parts of wetting agent, 20 parts of perlite and 200 parts of weighting agent.
11. A method of preparing an alpha-olefin drilling fluid as claimed in any one of claims 5 to 10, comprising the steps of:
s1, mixing alpha-olefin base liquid, an emulsifier and a wetting agent, and stirring to obtain a mixture 1;
s2, mixing the mixture 1 with saline water, and stirring to obtain a mixture 2;
s3, mixing the mixture 2 with an alkalinity regulator, a filtrate reducer and organic soil, and stirring to obtain a mixture 3;
s4, mixing the mixture 3 with perlite, and stirring to obtain a mixture 4;
and S5, mixing the mixture 4 with a weighting agent, and stirring to obtain the alpha-olefin drilling fluid.
12. The method according to claim 11, wherein the stirring time in step S1 is 5 to 10min; and/or stirring time in the step S2 is 15-20 min; and/or the stirring time in the steps S3 and S4 is 10-15 min independently; and/or stirring time in the step S5 is 20-25 min.
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| RU2655035C1 (en) * | 2017-07-13 | 2018-05-25 | Публичное акционерное общество "Газпром" | Weighted invert-emulsion drilling mud |
| CN112592700A (en) * | 2020-12-22 | 2021-04-02 | 广州江盐化工有限公司 | Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof |
| CN113122197A (en) * | 2020-01-11 | 2021-07-16 | 中石化石油工程技术服务有限公司 | Shale oil horizontal well drilling fluid and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11760913B2 (en) * | 2019-06-14 | 2023-09-19 | King Fahd University Of Petroleum And Minerals | Perlite containing drilling fluids and uses thereof |
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| US5589442A (en) * | 1994-02-02 | 1996-12-31 | Chevron Chemical Company | Drilling fluids comprising mostly linear olefins |
| CN102424747A (en) * | 2011-09-30 | 2012-04-25 | 山东天信化工有限公司 | Synthetic base drilling fluid |
| CN102443381A (en) * | 2011-09-30 | 2012-05-09 | 山东天信化工有限公司 | Base liquid of synthetic base drilling fluid |
| RU2655035C1 (en) * | 2017-07-13 | 2018-05-25 | Публичное акционерное общество "Газпром" | Weighted invert-emulsion drilling mud |
| CN113122197A (en) * | 2020-01-11 | 2021-07-16 | 中石化石油工程技术服务有限公司 | Shale oil horizontal well drilling fluid and preparation method thereof |
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