CN115975613A - 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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- CN115975613A CN115975613A CN202111198909.9A CN202111198909A CN115975613A CN 115975613 A CN115975613 A CN 115975613A CN 202111198909 A CN202111198909 A CN 202111198909A CN 115975613 A CN115975613 A CN 115975613A
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- 239000012530 fluid Substances 0.000 title claims abstract description 125
- 239000004711 α-olefin Substances 0.000 title claims abstract description 101
- 238000005553 drilling Methods 0.000 title claims abstract description 97
- 239000010451 perlite Substances 0.000 claims abstract description 34
- 235000019362 perlite Nutrition 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 18
- 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 36
- 239000000203 mixture Substances 0.000 claims description 21
- 239000003921 oil Substances 0.000 claims description 15
- 239000000080 wetting agent Substances 0.000 claims description 14
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 13
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical group [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 12
- 239000010428 baryte Substances 0.000 claims description 12
- 229910052601 baryte Inorganic materials 0.000 claims description 12
- 239000003795 chemical substances by application 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
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000005642 Oleic acid 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
- 239000011297 pine tar Substances 0.000 claims description 11
- 229940068124 pine tar Drugs 0.000 claims description 11
- 239000002689 soil Substances 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
- 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
- 239000003784 tall oil Substances 0.000 claims description 9
- 239000003995 emulsifying agent Substances 0.000 claims description 8
- 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
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- 239000003607 modifier Substances 0.000 claims 1
- -1 polyoxyethylene Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000003208 petroleum Substances 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 14
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N 1-Heptene Chemical compound CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
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- 238000002360 preparation method Methods 0.000 description 6
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- 239000000314 lubricant Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000126 substance Substances 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
- 125000000217 alkyl group Chemical group 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
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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 base fluid includes a linear alpha-olefin, a nonionic surfactant, a 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) to (4-5) to (8-10) to (1-2). The alpha-olefin base fluid can effectively avoid adverse effects of pumping pressure increase, stratum fracture, borehole wall instability and the like caused by the increase 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 specific expansion times, the perlite is used as a heavy matter of the alpha-olefin drilling fluid at low temperature, and the perlite is softened when the temperature is increased, so that the drilling fluid can keep stable viscosity at high temperature, and further the alpha-olefin drilling fluid 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 an alpha-olefin base fluid and application thereof in drilling fluid.
Background
With the gradual highlighting of energy problems and environmental problems and the high-speed development of oil drilling technology, people put higher and higher requirements on energy exploitation, particularly oil exploitation. The traditional water-based drilling fluid has a narrow application range, and can not meet the requirements more and more under the current complicated underground condition, while the oil-based drilling fluid is difficult to popularize and use due to the fact that the oil-based drilling fluid has greater pollution to the environment and is forced to be restricted by related environmental protection regulations. Therefore, the synthetic base drilling fluid which appears as a substitute system of the water base drilling fluid and the oil base drilling fluid not only keeps the environmental protection characteristic of the water base drilling fluid, but also well inherits the performance characteristic of the oil base drilling fluid, and becomes an essential drilling fluid system in the drilling process of offshore complex strata and other sensitive land areas. According to the field use condition, the method comprises the following steps: the synthetic base drilling fluid has a series of advantages of strong sand carrying capacity, good lubricating property, shale inhibition and the like, and simultaneously effectively avoids the problems of environmental pollution, influence on well logging and well testing data and the like of the oil base drilling fluid.
The base fluid is the main component for preparing the drilling fluid, and the performance indexes of the base fluid determine most performance indexes of the drilling fluid, such as flash point, viscosity, freezing point and the like. At present, base fluids of synthetic base drilling fluids can be divided into ester base fluids, ether base fluids and alpha-olefin fluids; the alpha-olefin base fluid is easy to decompose by microorganisms because double bonds are reserved at the tail ends of molecules, and the base fluid does not contain toxic aromatic hydrocarbon and cyclic hydrocarbon compounds, and meanwhile, compared with other base fluids, the alpha-olefin base fluid has the advantages of low viscosity, low pour point, less residue on drill cuttings, low unit cost and the like, so that the alpha-olefin drilling fluid is most widely applied.
With the widespread use of alpha-olefin drilling fluids, new problems have slowly arisen, mainly in that the viscosity of the alpha-olefin drilling fluid is too high at low temperatures and too low, in particular too low, dynamic shear force is not sufficient to effectively carry the solid phase in the drilling fluid at high temperatures. In order to deal with various complex petroleum industry exploitation environments, it is necessary to provide the alpha-olefin drilling fluid with small viscosity change under low-temperature or high-temperature conditions.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an alpha-olefin base fluid and application thereof in drilling fluid. The alpha-olefin drilling fluid containing the alpha-olefin base fluid can cope with various complex petroleum industry exploitation environments.
To this end, the present invention provides in a first aspect an alpha-olefin base fluid 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 the linear alpha-olefin, the nonionic surfactant, the mineral oil and the 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 invention, the linear alpha olefin is a mixture of 1-heptene and 1-decene, wherein the mass of 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 an alkylphenol ethoxylate. The alkylphenol polyoxyethylene ether selected by the invention has high chemical stability, and is not easy to be damaged by strong acid and strong base even at high temperature, so that the prepared alpha-olefin base solution has stable property. In some preferred embodiments of the present invention, the alkyl group in the alkylphenol ethoxylates used may be an alkyl group having 8 to 16 carbons. In some embodiments of the present invention, the alkylphenol ethoxylates employed may be available under the trade designation OP-10 or the like.
In other embodiments of the present invention, the mineral oil is a white oil. The white oil basically has a saturated hydrocarbon structure, has the content of aromatic hydrocarbon, nitrogen, oxygen, sulfur and other substances close to zero, is environment-friendly, and has good oxidation stability and chemical stability.
The alpha-olefin base fluid contains components with specific proportions, and the non-ionic surfactant with high surface activity and the mineral oil and the liquid paraffin with extremely stable physical properties at low temperature are selected, so that the alpha-olefin base fluid is stable at low temperature, and adverse effects of increased pumping pressure, stratum fracture, borehole wall instability and the like caused by increased viscosity of the drilling fluid due to over low temperature in the drilling process are effectively avoided.
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 α -olefin drilling fluid comprises 90 parts by weight of an α -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 adjusting agent is a silicate. According to the invention, silicate is selected as the alkalinity regulator, because when the silicate is used for regulating the alkalinity of the drilling fluid, the silicate does not absorb water to expand in the using process, and the 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 the alkalinity regulator, because the sodium metasilicate pentahydrate has pH buffering capacity, the change of physical properties such as viscosity, emulsifying property and the like of the drilling fluid caused by the change of the pH value of the drilling fluid due to environmental factors in the using process of the drilling fluid can be avoided, and the drilling effect is further influenced.
The perlite in the alpha-olefin drilling fluid is used as a weighting material of the alpha-olefin drilling fluid at low temperature, and when the temperature rises, 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 the defects of sedimentation of a weighting agent (such as barite), high circulating pressure consumption and the like caused by viscosity reduction of the alpha-olefin drilling fluid due to temperature rise are avoided.
In some embodiments of the invention, the perlite has a multiple expansion ≧ 20. The expansion multiple of the perlite selected by the invention is more than or equal to 20, because if the perlite with the 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 present invention, the fluid loss additive is an oxidized asphalt.
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) to (3-5); further preferably, the mass ratio of the pine tar to the oleic acid is 7:3.
In other embodiments of the present invention, the weighting agent is barite.
In a third aspect of the present invention, there is provided a method for preparing an α -olefin drilling fluid according to the second aspect of the present invention, comprising the steps of:
s1, mixing the alpha-olefin base solution, 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 then 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 base fluid according to the first aspect of the present invention, added in the above preparation method, is 85 to 90 parts by weight, brine is 10 to 15 parts by weight, emulsifier is 3 to 5 parts by weight, fluid loss additive is 2 to 3 parts by weight, alkalinity regulator is 5 to 7 parts by weight, organic soil is 2 to 3 parts by weight, wetting agent is 1 to 2 parts by weight, perlite is 20 to 30 parts by weight, and weighting agent is 180 to 200 parts by weight.
In some preferred embodiments of the present invention, the α -olefin base fluid according to the first aspect of the present invention, which is added in the above preparation method, is 90 parts by weight, brine is 10 parts by weight, emulsifier is 4 parts by weight, fluid loss additive is 2.5 parts by weight, alkalinity regulator is 6 parts by weight, organic soil is 2 parts by weight, wetting agent is 2 parts by weight, perlite is 20 parts by weight, and weighting agent is 200 parts by weight.
In some embodiments of the invention, the alkalinity adjusting agent is a silicate. According to the invention, silicate is selected as the alkalinity regulator, because when the silicate is used for regulating the alkalinity of the drilling fluid, the silicate does not absorb water to expand in the using process, and the shale expansion possibly generated in the drilling process can be avoided.
In some preferred embodiments of the present invention, the alkalinity regulator is sodium metasilicate pentahydrate. Sodium metasilicate pentahydrate is selected as the alkalinity regulator, because the sodium metasilicate pentahydrate has pH buffering capacity, the change of physical properties such as viscosity, emulsifying property and the like of the drilling fluid caused by the change of the pH value of the drilling fluid due to environmental factors in the using process of the drilling fluid can be avoided, and the drilling effect is further influenced.
The perlite added in the method is used as a weighting material of the alpha-olefin drilling fluid at low temperature, and when the temperature rises, 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 the defects of sedimentation of a weighting agent (such as barite), high circulating pressure consumption and the like caused by viscosity reduction of the alpha-olefin drilling fluid due to temperature rise are avoided.
In some embodiments of the invention, the perlite has a multiple expansion ≧ 20. The expansion multiple of the perlite selected by the invention is more than or equal to 20, because if the perlite with too low expansion multiple is adopted, the volume weight is low, and the viscosity of the drilling fluid cannot 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 present invention, the fluid loss additive is an oxidized asphalt.
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) to (3-5); further preferably, the mass ratio of the pine tar to the oleic acid is 7:3.
In other embodiments of the present invention, the weighting agent is barite.
In some embodiments of the invention, the stirring time in step S1 is 5 to 10min.
In other embodiments of the present invention, the stirring time in step S2 is 15 to 20min.
In some embodiments of the invention, the stirring time in steps S3 and S4 is independently from 10 to 15min.
In other embodiments of the present invention, the stirring time in step S5 is 20 to 25min.
The invention has the beneficial effects that: the alpha-olefin base fluid provided by the invention contains components with specific proportions, and the non-ionic surfactant with high surface activity and the mineral oil and the liquid paraffin with extremely stable physical properties at low temperature are selected, so that the alpha-olefin base fluid is stable at low temperature, and the alpha-olefin drilling fluid containing the alpha-olefin base fluid can effectively avoid the adverse effects of increased viscosity of the drilling fluid, increased pump pressure, stratum fracture, borehole wall instability and the like caused by the increase of the viscosity of the drilling fluid at 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 heavy matter 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 drilling fluid can keep stable viscosity at a high temperature, and the defects of barite sedimentation, high circulating pressure consumption and the like caused by viscosity reduction of the alpha-olefin drilling fluid due to temperature increase are avoided. Namely, the alpha-olefin drilling fluid can cope with various complex petroleum industry exploitation environments by containing the specific alpha-olefin base fluid and perlite.
Detailed Description
In order that the invention may be more readily understood, the invention will now be described in further detail with reference to the following examples, which are given by way of illustration only and are not intended to limit the scope of the invention. The starting materials or components used in the present invention may be commercially or conventionally prepared unless otherwise specified.
Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, 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 open-ended terms that mean including, but not limited to.
The alkylphenol ethoxylates used in the examples below were sold under the trade designation OP-10.
Example 1
(1) Preparation of an alpha-olefin base fluid:
mixing linear alpha-olefin, OP-10 (alkylphenol ethoxylates), white oil and liquid paraffin according to a mass ratio of 100; wherein the linear alpha-olefin is prepared from 1-heptene and 1-decene according to the mass ratio of 1:1.
(2) Preparing alpha-olefin drilling fluid:
firstly weighing 90 parts of alpha-olefin base liquid 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 (with expansion multiple of 20) and 200 parts of barite, wherein the lubricant is prepared by mixing pine tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin base solution 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; finally adding barite, and stirring for 25min to obtain the alpha-olefin drilling fluid.
Example 2
(1) Preparing an alpha-olefin base fluid:
mixing 1-decene, OP-10 (alkylphenol ethoxylates), white oil and liquid paraffin according to a mass ratio of 95.5.
(2) Preparing alpha-olefin drilling fluid:
firstly, 85 parts of alpha-olefin base liquid prepared in the step (1), 15 parts of 25wt% calcium chloride solution, 5 parts of tall oil fatty acid, 3 parts of oxidized asphalt, 7 parts of sodium metasilicate pentahydrate, 2 parts of organic soil, 1 part of wetting agent, 20 parts of perlite (with expansion multiple of 20) and 180 parts of barite are weighed, wherein the lubricant is prepared by mixing pine tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin base solution 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; finally adding barite, and stirring for 20min to obtain the alpha-olefin drilling fluid.
Example 3
(1) Preparation of an alpha-olefin base fluid:
mixing linear alpha-olefin, OP-10 (alkylphenol ethoxylates), white oil and liquid paraffin according to a mass ratio of 90; wherein the linear alpha-olefin is prepared from 1-heptene and 1-decene according to the mass ratio of 1:1.
(2) Preparing alpha-olefin drilling fluid:
firstly, 88 parts of alpha-olefin base liquid prepared in the step (1), 12 parts of 20wt% calcium chloride solution, 3 parts of tall oil fatty acid, 2 parts of oxidized asphalt, 5 parts of sodium metasilicate pentahydrate, 3 parts of organic soil, 1.5 parts of wetting agent, 25 parts of perlite (with expansion multiple of 20) and 200 parts of barite are weighed, wherein the lubricating agent is obtained by mixing pine tar and oleic acid according to a mass ratio of 7:3.
Adding the alpha-olefin base solution 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; finally adding barite, and stirring for 22min to obtain the alpha-olefin drilling fluid.
Example 4
The same as example 1 except that 85 parts by weight of the alpha-olefin base fluid was added during the preparation of the alpha-olefin drilling fluid.
Example 5
The same as example 1 except that the amount of the alpha-olefin base fluid added during the preparation of the alpha-olefin drilling fluid was 80 parts by weight.
Comparative example 1
Essentially the same as example 1, except that no perlite has been added to the formulation of the alpha olefin drilling fluid.
Comparative example 2
Essentially the same as example 1 except that the perlite added during the formulation of the alpha olefin drilling fluid had a multiple expansion of 10.
Comparative example 3
Essentially the same as example 1 except that the mixture prepared directly from 1-heptene and 1-decene in the mass ratio of 1:1 was the alpha olefin base fluid.
Test example 1
The alpha-olefin drilling fluids prepared in examples 1-5 and comparative examples 1-3 were tested for their performance and the performance of the alpha-olefin drilling fluids was measured at 20 ℃ and 50 ℃ respectively. According to GB/T16783.2-2012 part 2 of the field test of the oil and gas industrial drilling fluid: the Apparent Viscosity (AV), plastic Viscosity (PV), yield value (YP) and dynamic-plastic ratio of the alpha-olefin drilling fluid are measured according to the standard of oil-based drilling fluid, 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 of the comparative example 2 is also reduced after the high temperature condition; 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 using the alpha-olefin as the raw material is not stable under the low-temperature condition.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. An alpha-olefin base fluid comprising a linear alpha-olefin, a nonionic surfactant, a mineral oil, and a liquid paraffin.
2. The alpha-olefin base fluid as claimed in claim 1, wherein the mass ratio of the linear alpha-olefin, the nonionic surfactant, the mineral oil and the liquid paraffin is (90-100): (4-5): (8-10): (1-2).
3. The α -olefin base fluid according to claim 1 or 2, wherein the linear α -olefin is selected from one or more linear α -olefins having 7 to 18 carbon atoms; and/or
The nonionic surfactant is alkylphenol polyoxyethylene; and/or
The mineral oil is white oil.
4. The alpha-olefin drilling fluid comprises the following components in parts by weight:
5. an alpha-olefin drilling fluid according to claim 4, wherein the alkalinity modifier is a silicate; sodium metasilicate pentahydrate is preferred.
6. An alpha-olefin drilling fluid as claimed in claim 4 or 5, wherein the perlite has a multiple of expansion of 20 or more.
7. An alpha-olefin drilling fluid according to any one of claims 4-6, wherein the brine is 20-30 wt% calcium chloride solution; and/or
The emulsifier is tall oil fatty acid; and/or
The fluid loss additive is oxidized asphalt.
8. An alpha olefin drilling fluid according to any of claims 4 to 7, wherein the wetting agent comprises pine tar and oleic acid; preferably, the mass ratio of the pine tar to the oleic acid is (5-7) to (3-5); and/or
The weighting agent is barite.
9. A method of preparing an alpha-olefin drilling fluid according to any one of claims 4 to 8, comprising the steps of:
s1, mixing alpha-olefin base liquid with an emulsifier and a wetting agent, and stirring to obtain a mixture 1;
s2, mixing the mixture 1 with brine and then 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 then 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.
10. The method according to claim 9, wherein the stirring time in step S1 is 5 to 10min; and/or the 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 respectively and independently; and/or the stirring time in step S5 is 20-25 min.
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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 |
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