CN110982496A - Oil-based drilling fluid, preparation method thereof and preparation method of anti-settling stabilizer - Google Patents
Oil-based drilling fluid, preparation method thereof and preparation method of anti-settling stabilizer Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
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Abstract
An oil-based drilling fluid, a preparation method thereof and a preparation method of an anti-settling stabilizer. The preparation method of the anti-settling stabilizer comprises the following steps: the anti-settling stabilizer is prepared by modifying raw materials of lithium bentonite and attapulgite by using an organic cationic surfactant and a nonionic amine-terminated polyether compound as modifiers. The oil-based drilling fluid comprises, based on 100ml of the sum of the volumes of the base oil and the aqueous phase: 80-95 ml of base oil, 5-20 ml of water phase, 3-6 g of emulsifier, 0.5-2 g of wetting agent, 0.25-2 g of viscosity regulator, 2-8 g of fluid loss additive, 2-4 g of alkalinity regulator, 0.2-1 g of anti-settling stabilizer and weighting agent. The oil-based drilling fluid has good anti-settling stability and rheological property under the conditions of high temperature and high pressure.
Description
Technical Field
The application relates to but is not limited to the technical field of petroleum drilling, in particular to but not limited to a high-temperature high-pressure anti-settling stable oil-based drilling fluid, a preparation method thereof and a preparation method of an anti-settling stabilizer.
Background
With the development of the oil exploration and development industry, high-temperature and high-pressure operation areas gradually become key areas of oil operation. Particularly, the high-temperature and high-pressure horizontal well drilling construction has the characteristics of high bottom temperature, large formation pressure, long horizontal well section and the like, and brings great challenges to the drilling technology. The drilling operation in the high-temperature and high-pressure operation area requires that the oil-based drilling fluid system has the performance characteristics of high-temperature resistance stability, system rheological stability under the condition of high solid content, sedimentation stability, low filtration loss and the like.
Traditional oil-based drilling fluid system (density greater than or equal to 1.8 g/cm)3) In the range of 5% to 10% (by mass)Volume fraction) in the presence of active polluted soil, the rheological property and the high-temperature high-pressure filtration loss of the system are difficult to control; after static aging at 232 ℃ for 72 hours, gelation occurred, and a barite settling phenomenon occurred.
Furthermore, the conventional oil-based drilling fluid system is prone to the problem of heavy material sedimentation under the conditions of high temperature and high density. Particularly, the sedimentation phenomenon of the weighting material is serious under the condition of long-time high-temperature standing. To address the settling problem of weighting materials, the settling stability of drilling fluid systems is often increased by increasing the dynamic shear and gel strength of the drilling fluid system. However, the method for improving the dynamic shear force and the gel strength inevitably thickens the system, deteriorates the rheological property, is not beneficial to the control of the circulating equivalent density in the field operation process of the system, and is easy to cause the complex conditions of stimulating the underground pressure, inducing the well leakage, well kick and the like.
Disclosure of Invention
The oil-based drilling fluid and the preparation method thereof and the preparation method of the anti-settling stabilizer are provided aiming at the problems of the existing oil-based drilling fluid system, the prepared anti-settling stabilizer can solve the problem of poor suspension stability of solid phase particles in a high-temperature and high-pressure horizontal well on the premise of maintaining lower viscosity, and the oil-based drilling fluid has better anti-settling stability and rheological property under the conditions of high temperature and high pressure.
Specifically, the application provides a preparation method of an anti-settling stabilizer, which comprises the following steps: the anti-settling stabilizer is prepared by modifying raw materials of lithium bentonite and attapulgite by using an organic cationic surfactant and a nonionic amine-terminated polyether compound as modifiers.
In an embodiment of the present application, a method for preparing the anti-settling stabilizer may include:
(a) adding the lithium bentonite and the attapulgite into water, stirring and dispersing to obtain a suspension, and heating the suspension;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound, heating to the heated temperature of the step (a), dissolving a modifier mixture in an ethanol aqueous solution to obtain an ethanol aqueous solution of a modifier, slowly adding the ethanol aqueous solution of the modifier into the suspension obtained in the step (a), and then carrying out heat preservation reaction at the heated temperature of the step (a);
(c) after the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, depositing and layering, filtering, and washing a filter cake to be neutral by using water;
(d) removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c);
(e) drying the solid obtained in the step (d), grinding the solid into powder, and sieving the powder to obtain the anti-settling stabilizer.
In an embodiment of the present application, in the step (a), the weight ratio of the lithium-based bentonite to the attapulgite may be 1:1 to 5: 1.
In embodiments of the present application, in step (a), the heating may be heating to 70 ℃ to 85 ℃.
In an embodiment of the present application, in the step (a), the cation exchange capacity of the lithium bentonite may be 40 meq/100 g to 50 meq/100 g, and the cation exchange capacity of the attapulgite may be 25 meq/100 g to 40 meq/100 g.
In an embodiment of the present application, in the step (a), the lithium-based bentonite and the attapulgite may be added to water under continuous stirring.
In the examples herein, the reaction time of the reaction in step (b) may be 2 to 6 hours.
In an embodiment of the present application, in the step (b), the organic cationic surfactant may be selected from any one or more of octadecyl trimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride, di-hydrogenated tallow methyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, didodecyl dimethyl ammonium chloride, ditetradecyl dimethyl ammonium bromide, and ditetradecyl dimethyl ammonium chloride.
In the embodiments of the present application, in the step (b), the nonionic amine-terminated polyether compound may be selected from any one or more of amine-terminated polyethers D230, D400, M600 and M1000.
In an embodiment of the present application, in the step (b), the total amount of the cations in the organic cationic surfactant and the amine groups in the nonionic amine-terminated polyether compound may be 80% to 120% of the total amount of the cation exchange capacity of the mixed lithium bentonite and attapulgite of the step (a).
In the examples of the present application, in step (b), the weight ratio of the organic cationic surfactant to the nonionic amine-terminated polyether compound may be 2:1 to 5: 1.
In the examples of the present application, in the step (b), the ethanol aqueous solution may be prepared from anhydrous ethanol and water at a volume ratio of 1: 1.
In embodiments of the present application, in step (c), the neutral pH may be 6 to 7.
In the examples of the present application, in the step (d), unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) can be removed by centrifugation.
In the examples of the present application, in the step (e), the sieving may be a 100-mesh sieve.
In an embodiment of the present application, a method for preparing the anti-settling stabilizer may include:
(a) under the condition of continuous stirring, slowly adding the lithium bentonite and the attapulgite into water after mixing according to the weight ratio of 1:1 to 5:1, stirring to uniformly disperse to obtain a suspension, and then heating the suspension to 70-85 ℃;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound according to the weight ratio of 2: 1-5: 1, heating to 70-85 ℃, dissolving in an ethanol aqueous solution (prepared from absolute ethanol and water in a volume ratio of 1: 1) to obtain an ethanol aqueous solution of a modifier, slowly adding the ethanol aqueous solution of the modifier into the suspension obtained in the step (a), and then carrying out heat preservation reaction at 70-85 ℃ for 2-6 hours.
(c) After the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, precipitating until the precipitation is clear, filtering, and washing a filter cake with distilled water until the pH value is 6-7;
(d) then a high-speed centrifuge is used for centrifugal separation, and unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) are removed to the maximum extent;
(e) drying the solid obtained in the step (d), grinding the solid into powder, and sieving the powder by a 100-mesh sieve to obtain the anti-settling stabilizer;
wherein, in the step (a), the cation exchange capacity of the lithium bentonite is 40 milliequivalent/100 g to 50 milliequivalent/100 g, and the cation exchange capacity of the attapulgite is 25 milliequivalent/100 g to 40 milliequivalent/100 g;
in the step (b), the organic cationic surfactant is selected from one or more of octadecyl trimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride, di-hydrogenated tallow methyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, didodecyl dimethyl ammonium chloride, ditetradecyl dimethyl ammonium bromide and ditetradecyl dimethyl ammonium chloride; the nonionic amine-terminated polyether compound is selected from one or more of amine-terminated polyethers D230, D400, M600 and M1000, D230 and D400 can be purchased from Pasteur, Henscman and the like, and M600 and M1000 can be purchased from Henscman and the like; the total amount of cations in the organic cationic surfactant and amine groups in the nonionic amine-terminated polyether compound is 80-120% of the total amount of the cation exchange capacity of the lithium bentonite and the attapulgite after mixing in the step (a).
The application also provides an oil-based drilling fluid, which comprises the anti-settling stabilizer prepared by the method.
In an embodiment of the present application, the oil-based drilling fluid may include, based on the sum of the volumes of the base oil and the aqueous phase being 100 ml: 80-95 ml of base oil, 5-20 ml of water phase, 3-6 g of emulsifier, 0.5-2 g of wetting agent, 0.25-2 g of viscosity regulator, 2-8 g of fluid loss additive, 2-4 g of alkalinity regulator, 0.2-1 g of anti-settling stabilizer and weighting agent. The amount of weighting agent added may be selected based on the desired density of the oil-based drilling fluid.
Optionally, the wetting agent is added in an amount of 1g to 2g, based on 100ml of the sum of the volumes of the base oil and the aqueous phase.
In embodiments herein, the base oil may be selected from any one or more of diesel, white oil, and gas oil.
In the examples herein, the aqueous phase may be an inorganic salt solution, and optionally, may be selected from any one or more of an aqueous calcium chloride solution, an aqueous sodium chloride solution, and an aqueous potassium chloride solution; optionally, the mass fraction of solute in the salt solution may be 20 wt% to 30 wt%.
In the embodiments of the present application, the emulsifier may be selected from any one or more of nonionic surfactant-based emulsifiers, for example, may be selected from any one or more of fatty acid polyamide-based emulsifiers, fatty acid polyoxyethylene ester-based emulsifiers, and fatty acid polyoxyethylene ether-based emulsifiers.
Optionally, the emulsifier may be selected from any one or more of tall oil fatty acid polyamide, polyoxyethylene oleate and polyoxyethylene stearate.
In embodiments of the present application, the wetting agent may be selected from any one or more of alkyl benzene sulfonate type wetting agents, polyoxyethylene (propylene) alkyl sulfate type wetting agents, or sulfonate type wetting agents (i.e., polyoxyethylene alkyl sulfate type wetting agents, polyoxyethylene alkyl sulfonate type wetting agents, polyoxypropylene alkyl sulfate type wetting agents, polyoxypropylene alkyl sulfonate type wetting agents), and polyoxyethylene alkyl alcohol ether type wetting agents.
Optionally, the alkylbenzene sulfonate wetting agent may include any one or more of calcium dodecylbenzenesulfonate, sodium hexadecylbenzenesulfonate and calcium octadecylbenzenesulfonate.
Optionally, the polyoxyethylene (propylene) alkylsulfate or sulfonate wetting agent may include one or more of polyoxypropylene alkylsulfate (containing 14 carbons and 8 propoxy groups in the carbon chain), polyoxypropylene alkylsulfate (containing 12 to 13 carbons and 8 propoxy groups in the carbon chain), and alkylaryl polyoxyethylene sulfonate (where the aryl group as a substituent may be a phenyl group).
Optionally, the polyoxyethylene alkyl alcohol ether-based wetting agent may include any one or more of fatty alcohol polyoxyethylene ether (MOA-3, MOA-4 or MOA-5) and isomeric decyl alcohol polyoxyethylene ether.
In an embodiment of the present application, the viscosity modifier may be an organic soil.
Optionally, the organic soil can be selected from one or more of sodium bentonite modified by long-chain quaternary ammonium salt, wherein the number of carbon atoms of the long chain is twelve, fourteen, sixteen and eighteen, and the number of the long chain is one or two.
In embodiments herein, the fluid loss additive may be selected from any one or more of long chain organic amine modified humic acids (e.g., organic amine modified humic acids having twelve to eighteen carbon atoms), oxidized asphalt, and sulfonated asphalt.
Optionally, the carbon number of the organic amine in the organic amine modified humic acid can be fourteen, sixteen or eighteen.
In an embodiment of the present application, the alkalinity regulator may be selected from any one or both of calcium oxide and calcium hydroxide.
In embodiments of the present application, the weighting agent may be selected from any one or more of barite, limestone powder, and galena powder.
In embodiments of the present application, the oil-based drilling fluid may have a density of 1.8g/cm3To 2.5g/cm3。
The application also provides a preparation method of the oil-based drilling fluid, which comprises the following steps:
(1) adding the emulsifier and the wetting agent into the base oil, and stirring and mixing;
(2) continuously adding the viscosity regulator and the alkalinity regulator, and stirring and mixing;
(3) continuously adding the water phase, stirring and mixing;
(4) continuously adding the filtrate reducer and the anti-settling stabilizer, and stirring and mixing;
(5) and adding the weighting agent and stirring to adjust the density of the drilling fluid to a desired value to obtain the oil-based drilling fluid.
In the embodiment of the present application, the stirring and mixing time in the steps (1) to (4) may be 5min to 30min, and the rotation speed of the stirring and mixing may be 8000rpm/min to 12000 rpm/min.
The beneficial effect that this application obtained lies in:
the oil-based drilling fluid provided by the application has better rheological property, sedimentation stability and pollution resistance under the conditions of high temperature and high pressure, and is low in filter loss.
The oil-based drilling fluid belongs to a water-in-oil type emulsified drilling fluid, water drops are stably dispersed in an oil phase by adding surfactants such as an emulsifier, a wetting agent and the like, but the water drops are easily desorbed from an oil-water interface under a high-temperature condition, so that the water drops are not easily and stably dispersed in the oil phase. Because the specific emulsifying agent and the wetting agent provided by the application have stronger emulsifying capacity and high-temperature resistance, when the emulsifying agent and the wetting agent are selected, the prepared oil-based drilling fluid has excellent high-temperature stability; meanwhile, the selected emulsifier and wetting agent can be adsorbed on the active polluted soil to modify the active polluted soil, so that the oil-based drilling fluid system has better rheological property, is resistant to pollution and has the effect of reducing the filtration loss.
Further, because the specific fluid loss additives provided by the application have good temperature resistance, the fluid loss can be further reduced when the fluid loss additives are selected.
Meanwhile, the anti-settling stabilizer prepared by the specific method can form a stable three-dimensional space grid structure based on the hydrophobically modified flaky lithium bentonite and the rodlike attapulgite, so that the oil-based drilling fluid can solve the problem of poor suspension stability of solid-phase particles in a high-temperature high-pressure horizontal well on the premise of maintaining lower viscosity.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and methods described in the specification.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The raw materials and reagents used in the following cases are all common commercial products unless otherwise specified.
The basis of the performance test comprises:
(1) the density of the drilling fluid is measured by adopting a method and an instrument specified by the Chinese national standard GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 nd part of oil-based drilling fluid;
(2) the plastic viscosity of the drilling fluid is measured by adopting a method and an instrument specified by the Chinese national standard GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test part 2 oil-based drilling fluid;
(3) the dynamic shear force of the drilling fluid is measured by adopting a method and an instrument specified by the Chinese national standard GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 nd part of oil-based drilling fluid;
(4) the demulsification voltage of the drilling fluid is measured by adopting a method and an instrument specified by the national standard GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 nd part of oil-based drilling fluid;
(5) measuring the high-temperature high-pressure (HTHP) filtration loss of the drilling fluid by adopting a method and an instrument specified by the Chinese national standard GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 part oil-based drilling fluid; the measured temperature of the high-temperature high-pressure fluid loss measurement was 176 ℃ and the pressure was 3.5 MPa.
Example 1
An anti-settling stabilizer was prepared according to the composition of table 1, comprising the steps of:
(a) under the state of continuous stirring, slowly adding the lithium bentonite and the attapulgite into water after mixing according to a certain proportion, stirring to uniformly disperse to obtain a turbid liquid, and then heating the turbid liquid to 70 ℃;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound according to a ratio of 4:1, heating to 70 ℃, dissolving the heated modifier mixture in an ethanol aqueous solution (prepared from absolute ethanol and water in a volume ratio of 1: 1) to prepare an ethanol aqueous solution of a modifier with the mass fraction of 15 wt%, slowly adding the ethanol aqueous solution into the suspension obtained in the step (a), and then carrying out heat preservation reaction at 70 ℃ for 2 hours;
(c) after the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, precipitating until the precipitation is clear, filtering, and washing a filter cake with distilled water until the pH value is 6;
(d) adding the washed filter cake obtained in the step (c) into a high-speed centrifuge, setting the rotating speed of the high-speed centrifuge to 13000r/min, performing centrifugal separation for 20min, and removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) to the maximum extent;
(e) and (d) placing the solid obtained in the step (d) in an electric heating air blast dryer at 105 ℃ for drying for 2 hours, grinding the solid into powder, and sieving the powder through a 100-mesh sieve to obtain the anti-settling stabilizer.
Example 2
An anti-settling stabilizer was prepared according to the composition of table 1, comprising the steps of:
(a) under the state of continuous stirring, slowly adding the lithium bentonite and the attapulgite into water after mixing according to a certain proportion, stirring to uniformly disperse the mixture to obtain a turbid liquid, and then heating the turbid liquid to 85 ℃;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound according to the proportion of 5:1, heating to 85 ℃, dissolving the heated modifier mixture in an ethanol aqueous solution (prepared from absolute ethanol and water in a volume ratio of 1: 1) to prepare an ethanol aqueous solution of a modifier with the mass fraction of 18 wt%, slowly adding the ethanol aqueous solution into the suspension obtained in the step (a), and then carrying out heat preservation reaction at 85 ℃ for 6 hours;
(c) after the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, precipitating until the precipitation is clear, filtering, and washing a filter cake with distilled water until the pH value is 7;
(d) adding the washed filter cake obtained in the step (c) into a high-speed centrifuge, setting the rotating speed of the high-speed centrifuge to 13000r/min, performing centrifugal separation for 20min, and removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) to the maximum extent;
(e) and (d) placing the solid obtained in the step (d) in an electric heating air blast dryer at 105 ℃ for drying for 2 hours, grinding the solid into powder, and sieving the powder through a 100-mesh sieve to obtain the anti-settling stabilizer.
Example 3
An anti-settling stabilizer was prepared according to the composition of table 1, comprising the steps of:
(a) under the state of continuous stirring, slowly adding the lithium bentonite and the attapulgite into water after mixing according to a certain proportion, stirring to uniformly disperse the mixture to obtain a turbid liquid, and then heating the turbid liquid to 80 ℃;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound according to the proportion of 3:1, heating to 80 ℃, dissolving the heated modifier mixture in an ethanol aqueous solution (prepared from absolute ethanol and water in a volume ratio of 1: 1) to prepare an ethanol aqueous solution with the mass fraction of the modifier being 16 wt%, slowly adding the ethanol aqueous solution into the suspension obtained in the step (a), and then carrying out heat preservation reaction at 80 ℃ for 5 hours;
(c) after the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, precipitating until the precipitation is clear, filtering, and washing with distilled water until the neutral pH value is 6;
(d) adding the washed filter cake obtained in the step (c) into a high-speed centrifuge, setting the rotating speed of the high-speed centrifuge to 13000r/min, performing centrifugal separation for 20min, and removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) to the maximum extent;
(e) and (d) placing the solid obtained in the step (d) in an electric heating air blast dryer at 105 ℃ for drying for 2 hours, grinding the solid into powder, and sieving the powder through a 100-mesh sieve to obtain the anti-settling stabilizer.
The compositions of examples 1 to 3 are shown in table 1.
TABLE 1 composition of anti-settling stabilizers
Example 4
(1) The formula of the high-temperature high-pressure anti-settling stable oil-based drilling fluid (the oil-water ratio is 80:20) comprises the following components in percentage by weight:
the base oil is 3# white oil; the water phase is CaCl with the mass fraction of 25%2An aqueous solution; the emulsifier is tall oil fatty acid polyamide and oleic acid polyoxyethylene ester; the wetting agent is calcium dodecyl benzene sulfonate; the organic soil is sodium bentonite modified by didodecyldimethylammonium chloride; the alkalinity regulator is calcium oxide; the fluid loss additive was oxidized asphalt, the anti-settling stabilizer was prepared from example 1, and the weighting agent was barite.
(2) The preparation method of the drilling fluid comprises the following steps:
adding 8g of tall oil fatty acid polyamide, 4g of polyoxyethylene oleate and 4g of calcium dodecyl benzene sulfonate into 320mL of white oil, and stirring at a high speed of 12000rpm/min (the same below) for 5min in a high-speed stirrer; adding 8g of sodium bentonite modified by didodecyldimethylammonium chloride and 12g of calcium oxide under high-speed stirring, and stirring at high speed for 5 min; continuously adding 80mL of CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring the aqueous solution at high speed for 20 min; then adding 8g of oxidized asphalt and 2g of the anti-settling stabilizer prepared in the example 1, and stirring at a high speed for 5 min; finally adding barite to increase the weight to the density of 1.8g/cm3And stirring at a high speed for 20min to prepare the oil-based drilling fluid.
(3) Evaluating the performance of the drilling fluid:
1) before the aging performance of the drilling fluid is tested, the rheological property, the electrical stability, the high-temperature high-pressure fluid loss property and other properties of the prepared drilling fluid are tested, and the results are shown in table 2.
2) And then putting the drilling fluid into a high-temperature aging tank, standing and aging for 72h at a set aging temperature, and cooling to 65 ℃ to test the aged performance of the drilling fluid, wherein the results are shown in Table 3.
The testing method of the static sedimentation stability performance is a static sedimentation factor evaluation method: after the drilling fluid sample is statically aged in the aging tank, the density rho of the upper part of the drilling fluid sample (the lower layer of the free body) is respectively measuredtopAnd density of the bottom ρbottom. The static sedimentation factor SF was calculated as follows:
and evaluating the static settling stability of the drilling fluid according to the settling factor SF of the drilling fluid. An SF of 0.50 to 0.53 indicates no static settling of the drilling fluid system, and an SF greater than 0.53 indicates static settling.
(4) Evaluation of anti-pollution performance of the drilling fluid:
preparing 3 parts of the same oil-based drilling fluid with the serial numbers of 1#, 2# and 3# according to the method described in the step (2), adding 20ppb calcium soil into the 1# oil-based drilling fluid, adding 15% of seawater into the 2# oil-based drilling fluid for pollution test, adding 15% of spacer fluid into the 3# oil-based drilling fluid for pollution test, then placing the polluted drilling fluid into a high-temperature aging tank, standing and aging for 72 hours at a set aging temperature, and testing the performance of the drilling fluid after the drilling fluid is aged after the drilling fluid is cooled to 65 ℃, wherein the result is shown in a table 4.
Example 5
(1) The formula of the high-temperature high-pressure anti-settling stable oil-based drilling fluid (the oil-water ratio is 90:10) comprises the following components in parts by weight:
the base oil is Saraline185V gas-to-liquid oil; the water phase is CaCl with the mass fraction of 25%2An aqueous solution; the emulsifier is tall oil fatty acid polyamide; the wetting agent is calcium dodecylbenzene sulfonate and polyoxypropylene alkyl sulfate (carbon)14 carbons in the chain, 8 propoxy groups); the organic soil is sodium bentonite modified by dicetyl dimethyl ammonium bromide; the alkalinity regulator is calcium hydroxide; the fluid loss additive is octadecylamine modified humic acid, the anti-settling stabilizer is prepared from example 2, and the weighting agent is barite.
(2) The preparation method of the drilling fluid comprises the following steps:
adding 16g of tall oil fatty acid polyamide, 5g of calcium dodecyl benzene sulfonate and 3g of polyoxypropylene alkyl sulfate into 360mL of white oil, and stirring at a high speed of 12000rpm/min (the same applies below) for 5min in a high-speed stirrer; adding 2g of sodium bentonite modified by dicetyl dimethyl ammonium bromide and 16g of calcium hydroxide under the high-speed stirring state, and stirring at a high speed for 5 min; continuously adding 40mL of CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring the aqueous solution at a high speed for 20min, then adding 16g of octadecylamine modified humic acid and 0.8g of the anti-settling stabilizer prepared in the example 2, and stirring at a high speed for 5 min; finally adding barite to increase weight to 2.4g/cm3And stirring at a high speed for 20min to prepare the oil-based drilling fluid.
(3) The drilling fluid properties were evaluated as in example 4.
(4) The anti-contamination performance of the drilling fluid was evaluated as in example 4.
Example 6
(1) The formula of the high-temperature high-pressure anti-settling stable oil-based drilling fluid (the oil-water ratio is 95:5) comprises the following components in parts by weight:
the base oil is Sarapar147 gas-produced oil; the water phase is CaCl with the mass fraction of 25%2An aqueous solution; the emulsifier is tall oil fatty acid polyamide and stearic acid polyoxyethylene ether; the wetting agent is polyoxypropylene alkyl sulfate (the carbon chain contains 12-13 carbon atoms and 8 propoxy groups) and fatty alcohol-polyoxyethylene ether (MOA-3); the organic soil is sodium bentonite modified by dioctadecyl dimethyl ammonium chloride; the alkalinity regulator is calcium hydroxide; the fluid loss additive was octadecylamine modified humic acid and sulfonated asphalt, the anti-settling stabilizer was prepared from example 3, and the weighting agent was barite.
(2) The preparation method of the drilling fluid comprises the following steps:
to 360mL of white oil were added 12g of tall oil fatty acid polyamide and 12g of stearic acid polymerStirring the polyoxyethylene ether, 4g of polyoxypropylene alkyl sulfate (the carbon chain contains 12-13 carbon atoms and 8 propoxy groups) and 2g of fatty alcohol-polyoxyethylene ether (MOA-3) in a high-speed stirrer at a high speed of 12000rpm/min (the same applies below) for 5 min; adding 1g of sodium bentonite modified by dioctadecyl dimethyl ammonium chloride and 16g of calcium hydroxide under the high-speed stirring state, and stirring at high speed for 5 min; continuously adding 40mL of CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring the aqueous solution at high speed for 20 min; then 16g of octadecylamine modified humic acid, 16g of sulfonated asphalt and 4g of the anti-settling stabilizer prepared in the embodiment 3 are added, and the mixture is stirred at a high speed for 5 min; finally adding barite to increase weight to 2.5g/cm3And stirring at a high speed for 20min to prepare the oil-based drilling fluid.
(3) The drilling fluid properties were evaluated as in example 4.
(4) The anti-contamination performance of the drilling fluid was evaluated as in example 4.
Comparative example
This comparative example differs from example 5 only in that: no anti-settling stabilizer was added.
The results of the performance tests before and after aging of the oil-based drilling fluids of examples 4 to 6 and the comparative example are shown in tables 2 and 3, respectively.
TABLE 2 oil-based drilling fluid System Performance before aging
TABLE 3 oil-based drilling fluid System Performance after aging for 72h on standing
As can be seen from tables 2 and 3, the density of the high-temperature high-pressure anti-settling stable oil-based drilling fluid obtained in examples 4 to 6 of the present application is 1.8g/cm or more3Aging temperature of 180 ℃ or higher, belonging to high temperatureThe specific gravity of the drilling fluid can reach 2.5g/cm at most3The maximum aging temperature can reach 232 ℃.
Comparing the data in table 2 and table 3, it can be seen that the rheological properties of the high-temperature and high-pressure oil-based drilling fluids in embodiments 4 to 6 of the present application after standing for 72 hours at high temperature are still relatively stable, there is no sudden change, the emulsion breaking voltage (ES) is high, the high-temperature and high-pressure filtration loss (HTHP) is low, and the bottom does not have sedimentation, and the sedimentation factor SF is less than 0.53, which indicates that the anti-sedimentation stabilizer in embodiments of the present application forms a stable three-dimensional space grid structure, and the sedimentation stability is good. In the comparative example, the self-made anti-settling stabilizer is not added, so that severe settling occurs after the mixture is kept stand at a high temperature for 72 hours.
The anti-contamination performance of the high density oil-based drilling fluids obtained in examples 4 to 6 was also examined and the results are shown in table 4.
TABLE 4 anti-contamination Performance of oil-based drilling fluid systems
As can be seen from table 4, after the oil-based drilling fluid with high temperature, high pressure, anti-settling stability obtained in the embodiment of the present application is contaminated by external materials, the demulsification voltage still maintains a high level, and the rheological property is stable and does not change suddenly, which indicates that the oil-based drilling fluid has good basic performance and anti-pollution performance.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (12)
1. A preparation method of an anti-settling stabilizer comprises the following steps: the anti-settling stabilizer is prepared by modifying raw materials of lithium bentonite and attapulgite by using an organic cationic surfactant and a nonionic amine-terminated polyether compound as modifiers.
2. The method of claim 1, comprising:
(a) adding the lithium bentonite and the attapulgite into water, stirring and dispersing to obtain a suspension, and heating the suspension;
(b) mixing the organic cationic surfactant and the nonionic amine-terminated polyether compound, heating to the heated temperature of the step (a), dissolving a modifier mixture in an ethanol aqueous solution to obtain an ethanol aqueous solution of a modifier, slowly adding the ethanol aqueous solution of the modifier into the suspension obtained in the step (a), and then carrying out heat preservation reaction at the heated temperature of the step (a);
(c) after the reaction is finished, cooling the reaction liquid obtained in the step (b) to room temperature, depositing and layering, filtering, and washing a filter cake to be neutral by using water;
(d) removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c);
(e) drying the solid obtained in the step (d), grinding the solid into powder, and sieving the powder to obtain the anti-settling stabilizer.
3. The method of claim 2, wherein,
in the step (a), the weight ratio of the lithium bentonite to the attapulgite is 1:1 to 5: 1; optionally, the heating is to 70 ℃ to 85 ℃; the cation exchange capacity of the lithium bentonite is 40 milliequivalent/100 g-50 milliequivalent/100 g, and the cation exchange capacity of the attapulgite is 25 milliequivalent/100 g-40 milliequivalent/100 g; adding the lithium bentonite and the attapulgite into water under the state of continuous stirring; and/or
In the step (b), the reaction time of the reaction is 2 to 6 hours; optionally, the organic cationic surfactant is selected from any one or more of octadecyl trimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride, di-hydrogenated tallow methyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, didodecyl dimethyl ammonium chloride, ditetradecyl dimethyl ammonium bromide and ditetradecyl dimethyl ammonium chloride; the nonionic amine-terminated polyether compound is selected from any one or more of amine-terminated polyethers D230, D400, M600 and M1000; the total amount of cations in the organic cationic surfactant and amine groups in the nonionic amine-terminated polyether compound is 80% to 120% of the total amount of the cation exchange capacity of the mixed lithium bentonite and attapulgite in the step (a), wherein the weight ratio of the organic cationic surfactant to the nonionic amine-terminated polyether compound is 2:1 to 5: 1; the ethanol aqueous solution is prepared from absolute ethanol and water in a volume ratio of 1: 1; and/or
In step (c), the neutral pH is 6 to 7; and/or
In the step (d), removing unreacted organic cationic surfactant and nonionic amine-terminated polyether compound in the solid obtained in the step (c) by a centrifugal separation mode; and/or
In the step (e), the sieving is 100-mesh sieving.
4. An oil-based drilling fluid comprising an anti-settling stabilizer prepared by the method of any one of claims 1 to 3.
5. The oil-based drilling fluid of claim 4 comprising, based on 100ml of the combined volumes of base oil and aqueous phase: 80-95 ml of base oil, 5-20 ml of water phase, 3-6 g of emulsifier, 0.5-2 g of wetting agent, 0.25-2 g of viscosity regulator, 2-8 g of fluid loss additive, 2-4 g of alkalinity regulator, 0.2-1 g of anti-settling stabilizer and weighting agent.
6. The oil-base drilling fluid of claim 5 wherein the base oil is selected from any one or more of diesel, white oil and gassed oil.
7. An oil-base drilling fluid according to claim 5 or 6 wherein the aqueous phase is an inorganic salt solution, optionally selected from any one or more of aqueous calcium chloride, aqueous sodium chloride and aqueous potassium chloride; optionally, the mass fraction of solute in the salt solution is 20 wt% to 30 wt%.
8. The oil-base drilling fluid of any one of claims 5 to 7 wherein the emulsifier is selected from any one or more of fatty acid polyamide emulsifiers, fatty acid polyoxyethylene ester emulsifiers and fatty acid polyoxyethylene ether emulsifiers, optionally from any one or more of tall oil fatty acid polyamide, polyoxyethylene oleate and polyoxyethylene stearate.
9. The oil-base drilling fluid of any one of claims 5 to 8, wherein the wetting agent is selected from any one or more of alkylbenzene sulfonate type wetting agents, polyoxyethylene alkyl sulfate type wetting agents, polyoxyethylene alkylsulfonate type wetting agents, polyoxypropylene alkylsulfate type wetting agents, polyoxypropylene alkylsulfonate type wetting agents, and polyoxyethylene alkyl alcohol ether type wetting agents;
optionally, the viscosity regulator is organic soil, and optionally, the organic soil is selected from any one or more of sodium bentonite modified by long-chain quaternary ammonium salt, wherein the number of carbon atoms of the long chain is twelve, fourteen, sixteen and eighteen, and the number of the long chain is one or two;
optionally, the fluid loss additive is selected from one or more of organic amine modified humic acid with twelve to eighteen carbon atoms, oxidized asphalt and sulfonated asphalt, and further optionally, the organic amine modified humic acid has fourteen, sixteen or eighteen carbon atoms;
optionally, the alkalinity regulator is selected from any one or both of calcium oxide and calcium hydroxide;
optionally, the weighting agent is selected from any one or more of barite, limestone powder and galena powder.
10. The oil-base drilling fluid of any one of claims 5 to 9 wherein the density of the oil-base drilling fluid is 1.8g/cm3To 2.5g/cm3。
11. A method of making an oil-based drilling fluid according to any one of claims 5 to 10 comprising:
(1) adding the emulsifier and the wetting agent into the base oil, and stirring and mixing;
(2) continuously adding the viscosity regulator and the alkalinity regulator, and stirring and mixing;
(3) continuously adding the water phase, stirring and mixing;
(4) continuously adding the filtrate reducer and the anti-settling stabilizer, and stirring and mixing;
(5) and adding the weighting agent and stirring to adjust the density of the drilling fluid to a desired value to obtain the oil-based drilling fluid.
12. The production method according to claim 11, wherein the stirring and mixing time in the steps (1) to (4) is 5min to 30min, and the rotation speed of the stirring and mixing is 8000rpm/min to 12000 rpm/min.
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| CN201911348282.3A CN110982496B (en) | 2019-12-24 | 2019-12-24 | Oil-based drilling fluid and preparation method thereof and preparation method of anti-settling stabilizer |
| PCT/CN2020/094630 WO2021128745A1 (en) | 2019-12-24 | 2020-06-05 | Oil-based drilling fluid and preparation method therefor, and preparation method for anti-settling stabilizer |
| MYPI2022000904A MY205575A (en) | 2019-12-24 | 2020-06-05 | Oil-based drilling fluid and preparation method therefor, and preparation method for anti-settling stabilizer |
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| WO2021128745A1 (en) * | 2019-12-24 | 2021-07-01 | 中国海洋石油集团有限公司 | Oil-based drilling fluid and preparation method therefor, and preparation method for anti-settling stabilizer |
| CN114805709A (en) * | 2022-04-25 | 2022-07-29 | 中国石油大学(华东) | Ultrahigh-temperature-resistant nano plugging agent with emulsion stability for oil-based drilling fluid and preparation method and application thereof |
| CN116063995A (en) * | 2023-01-28 | 2023-05-05 | 潍坊远东膨润土有限公司 | Composite bentonite and preparation method thereof |
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| CN116023905B (en) * | 2023-03-28 | 2023-06-16 | 河北泽润工程橡塑有限公司 | Low-temperature-resistant rubber asphalt waterproof coiled material and production method thereof |
| CN117147370B (en) * | 2023-10-31 | 2023-12-22 | 西南石油大学 | A method for quantitative testing of the density suitability of lost circulation materials and drilling fluids |
| CN117736706B (en) * | 2024-02-21 | 2024-05-24 | 克拉玛依市义恩技术服务有限责任公司 | Water-soluble organic salt weighting agent for drilling fluid and preparation method thereof |
| CN118562467B (en) * | 2024-08-01 | 2024-09-27 | 成都西油华巍科技有限公司 | High-temperature-resistant filtrate reducer with lubricating and inhibiting characteristics and preparation method thereof |
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| MY205575A (en) | 2024-10-27 |
| CN110982496B (en) | 2022-04-08 |
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