CN116064003A - Oil-based gas stagnation for well drilling and preparation method thereof - Google Patents
Oil-based gas stagnation for well drilling and preparation method thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 46
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 28
- 239000000194 fatty acid Substances 0.000 claims abstract description 28
- 229930195729 fatty acid Natural products 0.000 claims abstract description 28
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 75
- 229920000768 polyamine Polymers 0.000 claims description 17
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims description 16
- 150000004670 unsaturated fatty acids Chemical class 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- YZXBAPSDXZZRGB-DOFZRALJSA-N arachidonic acid Chemical compound CCCCC\C=C/C\C=C/C\C=C/C\C=C/CCCC(O)=O YZXBAPSDXZZRGB-DOFZRALJSA-N 0.000 claims description 8
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 7
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 7
- 125000003277 amino group Chemical group 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
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- 239000002253 acid Substances 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 claims description 4
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- 235000020661 alpha-linolenic acid Nutrition 0.000 claims description 4
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 claims description 4
- 229940114079 arachidonic acid Drugs 0.000 claims description 4
- 235000021342 arachidonic acid Nutrition 0.000 claims description 4
- 239000000539 dimer Substances 0.000 claims description 4
- 229960004488 linolenic acid Drugs 0.000 claims description 4
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 claims description 4
- WBHHMMIMDMUBKC-XLNAKTSKSA-N ricinelaidic acid Chemical compound CCCCCC[C@@H](O)C\C=C\CCCCCCCC(O)=O WBHHMMIMDMUBKC-XLNAKTSKSA-N 0.000 claims description 4
- 229960003656 ricinoleic acid Drugs 0.000 claims description 4
- FEUQNCSVHBHROZ-UHFFFAOYSA-N ricinoleic acid Natural products CCCCCCC(O[Si](C)(C)C)CC=CCCCCCCCC(=O)OC FEUQNCSVHBHROZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims 1
- 239000013638 trimer Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000005465 channeling Effects 0.000 description 10
- 239000004033 plastic Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 8
- 239000003995 emulsifying agent Substances 0.000 description 6
- 239000000839 emulsion Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000440 bentonite Substances 0.000 description 5
- 229910000278 bentonite Inorganic materials 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 229960001124 trientine Drugs 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- -1 alcohol compound Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- 239000010428 baryte Substances 0.000 description 3
- 229910052601 baryte Inorganic materials 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 239000002283 diesel fuel Substances 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009775 high-speed stirring Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 238000007112 amidation reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 235000020778 linoleic acid Nutrition 0.000 description 2
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 1
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
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Classifications
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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
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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Abstract
The invention provides an oil-based gas stagnation plug for drilling and a preparation method thereof, wherein the high-temperature resistant cutting agent of fatty acid amide and/or fatty acid amide polymer is applied to oil-based drilling fluid, so that the dynamic cutting force and gel strength of the oil-based drilling fluid system can be effectively improved.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration, in particular to an oil-based gas stagnation for drilling and a preparation method thereof.
Background
Gas invasion is very easy to occur in the drilling process of the domestic shale gas reservoir and the deep gas reservoir, so that the upward channeling speed of the gas is too high, and the drilling and completion safety is affected. In order to ensure the safety of drilling, the domestic petroleum exploration safety technical specifications have limit requirements on the upward shifting speed of oil gas before the drilling, so how to control the upward shifting speed of the oil gas and ensure the well control safety is a technical problem which needs to be solved at present.
The main methods for controlling the oil-gas channeling speed in the water-based drilling fluid system at present are a gel valve, thick bentonite slurry, a conventional polymer thick plug, a gas stagnation plug and the like. The gas stagnation technology is a liquid rubber plug with high-temperature thixotropic property which is developed for reducing well control risks aiming at the difficult problem of gas invasion of a crack type oil and gas reservoir. There are mainly 2 kinds of gas stagnation, one is well slurry gas stagnation and the other is high temperature gas stagnation resistance. The well slurry gas stagnation is prepared by adding a flow regulator into the original water-based system, and has the advantages of convenient preparation and simple and convenient operation. The high temperature resistant gas stagnation is mainly composed of clear water, a high temperature resistant cutting agent, a high temperature resistant filtrate reducer, high temperature resistant fibers, an activity regulator, a pH value regulator and a weighting agent.
At present, no related patent and literature for oil-based gas stagnation exists at home and abroad, and only some patents and literature reports for oil-based drilling fluid cutting agents exist.
Patent No. ZL201410692203.1 discloses an oil-based drilling fluid cutting agent and a preparation method thereof. The cutting agent is prepared by polymerizing maleic anhydride and styrene in the presence of solvent and initiator to obtain a mixture, and then reacting the mixture in the presence of alcohol compound and catalyst to obtain the cutting agent, wherein the principle is that the cutting agent has long straight chain alkyl and contains a large number of polar groups, the long chain alkyl forms a network structure in oil-based drilling fluid through association, and the polar groups in molecules interact with other groups through electrostatic attraction or hydrogen bonds to form a network structure with large specific surface area, so that the dynamic cutting force of the drilling fluid is improved.
The Chinese patent with the patent number ZL201210054648.8 relates to a fluorine-containing oil-based drilling fluid cutting agent and a preparation method thereof, wherein dimethyl sulfoxide and azodiisobutyronitrile are added into acrylic ester and perfluoroalkyl ethyl acrylic ester to be mixed, the mixture is reacted for 25-35min under nitrogen, the temperature is increased to 50-80 ℃, the mixture is reacted for 4-36h, and the obtained polymer is mixed with anhydrous acetone and anhydrous diethyl ether in the volume ratio of 1:1:1 to obtain the cutting agent.
In the prior art, there are also some stripping agents: for example, the modified fatty acid cutting agent can replace organic soil in oil-based drilling fluid, myristic acid is compounded by a reaction product of a fatty acid dimer and polyalcohol serving as raw materials, and the viscosity-increasing cutting agent suitable for the oil-based drilling fluid without soil phase is prepared by adopting an emulsion polymerization method.
However, the above-mentioned cutting agent and drilling fluid system can only raise rheological property in a limited range, only raise the rock carrying capacity and suspension stability of oil-based drilling fluid, it can not be used as a cutting agent for gas stagnation, so that the oil-based drilling fluid can reach high cutting force, high gel strength and strong structural force, and can form a gas stagnation fluid capable of effectively blocking and slowing down upward channeling of oil gas.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the oil-based gas stagnation for drilling and the preparation method thereof, the oil-based gas stagnation can solve the technical problem that the oil gas channeling-up speed is too high during the construction of the oil-based drilling fluid, the safe operation time is prolonged, and the gas stagnation can be circulated into a well without influencing the well slurry performance.
In a first aspect, the present invention provides an oil-based gas stick for drilling comprising an oil-based drilling fluid and a high temperature cut-off resistant agent selected from fatty acid amides and/or fatty acid amide polymers.
The high-temperature resistant cutting agent has strong association capability, has strong hydrogen bond in molecules, can be adsorbed at an oil-water interface, enhances the tendency of emulsion droplet flocculation, and can strengthen the microstructure formed by stacking organic soil at the interface by forming a space network structure, thereby greatly improving the dynamic cutting force and the gel strength of emulsion.
The cutting agent applied to the oil-based drilling fluid at present is mainly used for improving the hydraulic cutting force and the dynamic-plastic ratio of the oil-based drilling fluid, so that the rock carrying capacity of the oil-based drilling fluid is improved. The oil-based gas stagnation is an unconventional fluid, and can form a thick oil-based gel-like plug on the basis of a conventional oil-based drilling fluid, and the oil-based gas stagnation dynamic shear force and the gel strength improvement rate can reach more than 10 times, so that the purpose of blocking oil and gas channeling is realized.
As a specific embodiment of the invention, the high temperature resistant cutting agent is used in an amount of 0.5 to 1.5 wt% based on the weight of the oil-based drilling fluid; and/or
The high temperature resistant stripping and cutting agent is a reaction product of unsaturated fatty acid and polyamine;
preferably, the unsaturated fatty acid is an unsaturated fatty acid polymer or a fatty acid containing two or more double bonds.
Preferably, one or more selected from dimerised fatty acids, trimerised fatty acids, linoleic acid, linolenic acid, ricinoleic acid and arachidonic acid.
The polyamine is a polyamine having two and/or more amine functional groups, preferably one or more selected from ethylenediamine, triethanolamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine.
In a second aspect, the invention provides a preparation method of oil-based gas stagnation for drilling, which comprises the steps of adding 0.5-1.5% of the high-temperature resistant cutting agent into oil-based drilling fluid, and uniformly stirring.
As a specific embodiment of the invention, the preparation method of the high-temperature resistant cutting agent comprises the following steps: the unsaturated fatty acid and polyamine are reacted until the acid value is less than or equal to 4.0mg KOH/g.
As a specific embodiment of the invention, the molar ratio of the total amount of carboxyl groups in the unsaturated fatty acid to the total amount of amine groups in the polyamine is 1:1 to 1:4, preferably 1:2 to 1:3.
It should be noted that, the unsaturated fatty acid and polyamine may not only undergo amidation reaction but also esterification reaction; if the amidation reaction is required to be preferred over the esterification reaction, a small excess of polyamine is required so that esterification side reactions can be prevented. Thus, the molar ratio of carboxyl groups to amine groups is defined to be 1:1 to 1:4, preferably 1:2 to 1:3.
The fatty acid amide copolymer obtained by the reaction has strong association capability, has strong hydrogen bond in molecules, can be adsorbed at an oil-water interface, enhances the tendency of emulsion droplet flocculation, and can strengthen the microstructure formed by stacking organic soil at the interface by forming a space network structure, thereby greatly improving the kinetic shear force and the gel strength of emulsion.
As a specific embodiment of the present invention, the unsaturated fatty acid is selected from unsaturated fatty acid polymers and fatty acids containing two or more double bonds, preferably, one or more selected from dimerized fatty acids, trimerized fatty acids, linoleic acid, linolenic acid, ricinoleic acid and arachidonic acid.
As a specific embodiment of the present invention, the polyamine is a polyamine having two and/or more amine functional groups, preferably one or more selected from ethylenediamine, triethanolamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine.
As a specific embodiment of the invention, the reaction is carried out under the protection of nitrogen, the temperature is 140-150 ℃, and the reaction time is 2-4 h.
The above-mentioned raw materials in the present invention are all self-made or commercially available, and the present invention is not particularly limited thereto.
Compared with the prior art, the invention has the beneficial effects that:
1. the oil-based gas stagnation for drilling mainly comprises oil-based drilling fluid and a high-temperature resistant cutting-lifting agent, wherein the cutting-lifting agent is fatty acid amide and/or fatty acid amide polymer, and is obtained by reacting unsaturated fatty acid and polyamine; the fatty acid amide copolymer has strong association capability, has strong intramolecular hydrogen bond, can be adsorbed at an oil-water interface, enhances the flocculation trend of emulsion drops, enhances the microstructure formed by stacking organic soil at the interface through forming a space network structure, and greatly improves the dynamic shearing force and the gel strength of emulsion, so that the oil-based drilling fluid is added with the shear lifting agent to form a thick plug similar to oil-based gel, the oil-based gas stagnation dynamic shearing force and the gel strength improvement rate can reach more than 10 times, and the temperature resistance is good, thereby realizing the purpose of blocking oil-gas channeling.
2. The high-temperature resistant cutting agent can be applied to oil-based drilling fluid, and can greatly improve the hydraulic cutting force and gel strength of the drilling fluid to form an oil-based gas stagnation. The oil-based gas stagnation plug has strong structural force when standing, can play a role in retarding and slowing down the upward channeling of oil gas, does not need to be additionally prepared, is simple and convenient and quick to construct, and does not influence the performance of drilling fluid.
Detailed Description
The invention is further illustrated below in connection with specific examples, which are not to be construed as limiting the invention in any way.
The acid number determination method used in the examples of the present invention was performed according to SN/T0801.19-1999.
The method of measuring the rheology in the embodiments of the invention is carried out according to GB/T16783.2-2012.
In the rheological properties of the examples of the invention, AV represents apparent viscosity in mPas; PV represents plastic viscosity in mPa.s; YP stands for dynamic shear force in Pa; gel represents Gel strength in Pa; the aging condition of the test fluid is 180 ℃ for 16 hours, and the high temperature resistance of the oil-based gas stagnation is tested, and the performance of the oil-based gas stagnation is not greatly changed after aging for 16 hours at 180 ℃, so that the gas stagnation is suitable for drilling operation in a high temperature environment.
In the gas channeling experiment in each embodiment of the invention, the modified visual permeation-free filter is utilized, 0.5L of test liquid is added into the organic glass tube, and the capability of blocking gas migration of the test liquid at normal temperature is tested.
In each embodiment of the invention, the model of the organic bentonite is NHY-1, the manufacturer is Nanjing chemical institute of China, the model of the oil-based drilling fluid filtrate reducer is SMFLA-O, and the manufacturer is China petroleum engineering institute of technology.
Example 1
The embodiment provides an oil-based gas stagnation for drilling and a preparation method thereof, and the specific details are as follows:
s1: 94g of linoleic acid and 12g of tetraethylenepentamine are weighed according to the molar ratio of carboxyl to amino of 1:1;
s2: heating linoleic acid to 100 ℃ in a flask for 15min under the protection of nitrogen, transferring to a constant pressure dropping funnel, and dripping tetraethylenepentamine for 30min;
s3: after completion of the dropwise addition of tetraethylenepentamine, the temperature was raised to 140℃and stirred at 300rpm for 2 hours, and reacted until the acid value was 3.2 (mg KOH/g); the high temperature resistant cutting agent is obtained.
S4: preparing an oil-based drilling fluid:
sequentially adding 8g of main emulsifier SMEMUL-1,6g of auxiliary emulsifier SMEMUL-2,80mL of calcium chloride aqueous solution with 25% concentration, 8g of organic bentonite NHY-1 and 8g of oil-based drilling fluid filtrate reducer SMFLA-O into 320mL of diesel oil under the condition of high-speed stirring at 10000rpm by using a Fann-N5025 high-speed stirrer or the same type of equipment, and stirring at a high speed for 0min each time when one treating agent is added; finally adding 270g of barite, stirring at high speed for 20min to obtain the product with density of 1.4g/cm 3 Is an oil-based drilling fluid.
S5: and (3) weighing 6g of the high-temperature-resistant cutting agent obtained in the step (S3), adding the weighed 6g into the oil-based drilling fluid obtained in the step (S4), and uniformly stirring to obtain the drilling oil-based gas stagnation containing 1% of the high-temperature-resistant cutting agent.
The drilling oil-based gas obtained in example 1 was stuck, and the rheological property was tested, and the test result was: the apparent viscosity AV was 54 mPas, the plastic viscosity PV was 10 mPas, the dynamic shear force YP was 44Pa, and the Gel strength Gel was 40Pa.
The oil-based gas for drilling obtained in example 1 was aged at 180 ℃ for 16 hours, and then subjected to rheological property test, and the test result is: the apparent viscosity AV was 60 mPas, the plastic viscosity PV was 14 mPas, the dynamic shear force YP was 46Pa, and the Gel strength Gel was 38Pa.
The oil-based gas stagnation plug for drilling obtained in example 1 was tested for its ability to retard gas migration at normal temperature, and the test result was a gas breakthrough rate of 0.3cm/s.
Example 2
The embodiment provides an oil-based gas stagnation for drilling and a preparation method thereof, and the specific details are as follows:
s1: weighing 93g of dimer fatty acid according to the molar ratio of carboxyl to amino of 1:2, and weighing 24g of triethylene tetramine;
s2: under the protection of nitrogen, heating dimer fatty acid to 100 ℃ in a flask for 15min, transferring to a constant pressure dropping funnel, and dripping triethylene tetramine for 30min;
s3: after completion of the dropwise addition of triethylenetetramine, the temperature was raised to 150℃and stirred at 300rpm for 4 hours, and the reaction was continued until the acid value was 2.8 (mg KOH/g); the high temperature resistant cutting agent is obtained.
S4: preparing an oil-based drilling fluid:
sequentially adding the following components into 320mL of diesel oil by using a Fann-N5025 high-speed stirrer or equipment of the same type under the high-speed stirring condition with the rotating speed of 10000 rpm: 8g of main emulsifier SMEMUL-1,6g of auxiliary emulsifier SMEMUL-2,80mL of 25% calcium chloride aqueous solution, 8g of organic bentonite NHY-1 and 8g of oil-based drilling fluid filtrate reducer SMFLA-O, wherein the mixture is stirred at a high speed for 0min after one treatment agent is added; finally adding 270g of barite, stirring at high speed for 20min to obtain the product with density of 1.4g/cm 3 Is an oil-based drilling fluid.
S5: and (3) weighing 6g of the high-temperature-resistant cutting agent obtained in the step (S3), adding the weighed 6g into the oil-based drilling fluid obtained in the step (S4), and uniformly stirring to obtain the drilling oil-based gas stagnation containing 1% of the high-temperature-resistant cutting agent.
The oil-based gas for drilling obtained in example 2 was stuck, and the rheological property was tested, and the test result was: the apparent viscosity AV was 65 mPas, the plastic viscosity PV was 15 mPas, the dynamic shear force YP was 50Pa, and the Gel strength Gel was 41Pa.
The oil-based gas for drilling obtained in example 2 was aged at 180℃for 16 hours, and then subjected to a rheological property test, which revealed that the apparent viscosity AV was 78 mPas, the plastic viscosity PV was 12 mPas, the dynamic shear force YP was 66Pa, and the Gel strength Gel was 45Pa.
The oil-based gas stagnation plug for drilling obtained in example 2 was tested for its ability to retard gas migration at normal temperature, and the test result was a gas breakthrough rate of 0.5cm/s.
Example 3
The embodiment provides an oil-based gas stagnation for drilling and a preparation method thereof, and the specific details are as follows:
s1: 52g of trimeric fatty acid is weighed according to the molar ratio of carboxyl to amino of 1:3, and 34g of diethylenetriamine is weighed;
s2: heating trimeric fatty acid to 100 ℃ in a flask for 15min under the protection of nitrogen, transferring to a constant pressure dropping funnel, and dropwise adding diethylenetriamine for 30min;
s3: after completion of the dropwise addition of diethylenetriamine, the temperature was raised to 150℃and stirred at 300rpm for 4 hours, and reacted until the acid value was 2.5 (mg KOH/g); the high temperature resistant cutting agent is obtained.
S4: preparing an oil-based drilling fluid:
sequentially adding the following components into 320mL of diesel oil by using a Fann-N5025 high-speed stirrer or equipment of the same type under the high-speed stirring condition with the rotating speed of 10000 rpm: 8g of main emulsifier SMEMUL-1,6g of auxiliary emulsifier SMEMUL-2,80mL of 25% calcium chloride aqueous solution, 8g of organic bentonite NHY-1 and 8g of oil-based drilling fluid filtrate reducer SMFLA-O, wherein the mixture is stirred at a high speed for 0min after one treatment agent is added; finally adding 270g of barite, stirring at high speed for 20min to obtain the product with density of 1.4g/cm 3 Is an oil-based drilling fluid.
S5: and (3) weighing 6g of the high-temperature-resistant cutting agent obtained in the step (S3), adding the weighed 6g into the oil-based drilling fluid obtained in the step (S4), and uniformly stirring to obtain the drilling oil-based gas stagnation containing 1% of the high-temperature-resistant cutting agent.
The drilling oil-based gas obtained in example 3 was stuck, and the rheological property was tested, and the test result was: the apparent viscosity AV was 66 mPas, the plastic viscosity PV was 13 mPas, the dynamic shear force YP was 53Pa, and the Gel strength Gel was 52Pa.
The oil-based gas for drilling obtained in example 3 was aged at 180℃for 16 hours, and then subjected to a rheological property test, which revealed that the apparent viscosity AV was 72 mPas, the plastic viscosity PV was 14 mPas, the dynamic shear force YP was 58Pa, and the Gel strength Gel was 50Pa.
The oil-based gas stagnation plug for drilling obtained in example 3 was tested for its ability to retard gas migration at normal temperature, and the test result was a gas breakthrough rate of 0.2cm/s.
Comparative example 1
In this comparative example, various performance tests were conducted on the oil-based drilling fluid base slurry obtained in step S4 in examples 1 to 3 and the oil-based gas stagnation for drilling of the high temperature resistant cutting agent prepared in examples 1 to 3, and the performance without the high temperature resistant cutting agent was compared, and specific details are as follows:
the comparative example is to perform fluid performance test and gas channeling test on the oil-based drilling fluid base slurry, and the test results are as follows: apparent viscosity AV is 26 mPas, plastic viscosity PV is 20 mPas, dynamic cutting force YP is 6Pa, and Gel strength Gel is 3Pa;
in this comparative example, an oil-based drilling fluid base slurry was aged at 180℃for 16 hours, and then subjected to a rheological property test, which gave an apparent viscosity AV of 22 mPa.s, a plastic viscosity PV of 17 mPa.s, a dynamic shear force YP of 4Pa, and a Gel strength Gel of 2Pa.
The oil-based drilling fluid base slurry of this comparative example was tested for its ability to retard gas migration at normal temperature, and the test result was a gas breakthrough rate of 21cm/s.
The test result lists of examples 1 to 3 and comparative example 1 were compared, see tables one and two.
Table 1-3 and comparative example 1 rheological Performance test results comparison Table
Table two comparative tables of results of gas channeling test of examples 1 to 3 and comparative example 1
In conclusion, the oil-based gas stagnation for drilling, which is obtained by adding the high-temperature-resistant cutting-lifting agent into the oil-based drilling fluid base slurry, has good high-temperature resistance and stable performance, can effectively improve the dynamic cutting force and gel strength of a drilling fluid system, has strong structural force when the gas stagnation is stood, can play a role in retarding and slowing down the upward channeling of oil gas, and has the advantages of simple preparation, simple, convenient and quick construction and no influence on the performance of the drilling fluid.
Any numerical value recited in this disclosure includes all values incremented by one unit from the lowest value to the highest value if there is only a two unit interval between any lowest value and any highest value. For example, if the amount of one component, or the value of a process variable such as temperature, pressure, time, etc., is stated to be 50-90, it is meant in this specification that values such as 51-89, 52-88 … …, and 69-71, and 70-71 are specifically recited. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 units may be considered as appropriate. This is only a few examples of the specific designations. In a similar manner, all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be disclosed in this application.
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 (8)
1. The oil-based gas stagnation for drilling is characterized by comprising oil-based drilling fluid and a high-temperature-resistant cutting-lifting agent, wherein the high-temperature-resistant cutting-lifting agent is fatty acid amide and/or fatty acid amide polymer.
2. The oil-based gas stagnation for drilling of claim 1 wherein said high temperature cut-off resistant is used in an amount of 0.5 to 1.5% by weight based on the weight of said oil-based drilling fluid; and/or
The high temperature resistant stripping and cutting agent is a reaction product of unsaturated fatty acid and polyamine;
preferably, the unsaturated fatty acid is an unsaturated fatty acid polymer or a fatty acid containing two or more double bonds;
more preferably, one or more selected from dimerized fatty acids, trimerized fatty acids, linoleic acid, linolenic acid, ricinoleic acid and arachidonic acid;
the polyamine is a polyamine having two and/or more amine functional groups;
preferably, one or more selected from ethylenediamine, triethanolamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine.
3. A preparation method of oil-based gas stagnation for well drilling is characterized in that 0.5-1.5% of high-temperature resistant cutting agent defined in claim 1 is added into oil-based drilling fluid, and the mixture is stirred uniformly.
4. The method of claim 3, wherein the method of preparing the high temperature resistant cut-off agent comprises: the unsaturated fatty acid and polyamine are reacted until the acid value is less than or equal to 4.0mg KOH/g.
5. The method according to claim 4, wherein the molar ratio of the total amount of carboxyl groups in the unsaturated fatty acid to the total amount of amine groups in the polyamine is 1:1 to 1:4, preferably 1:2 to 1:3.
6. The method according to claim 3 or 4, wherein the unsaturated fatty acid is an unsaturated fatty acid polymer or a fatty acid containing two or more double bonds, preferably one or more selected from the group consisting of dimer fatty acid, trimer fatty acid, linoleic acid, linolenic acid, ricinoleic acid and arachidonic acid.
7. The method of any one of claims 3 to 5, wherein the polyamine is a polyamine having two and/or more amine functional groups, preferably one or more selected from ethylenediamine, triethanolamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine.
8. The preparation method according to any one of claims 3 to 7, wherein the reaction is carried out under a nitrogen atmosphere at a reaction temperature of 140 to 150 ℃ for a reaction time of 2 to 4 hours.
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