CN112592700B - Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof - Google Patents
Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof Download PDFInfo
- Publication number
- CN112592700B CN112592700B CN202011530687.1A CN202011530687A CN112592700B CN 112592700 B CN112592700 B CN 112592700B CN 202011530687 A CN202011530687 A CN 202011530687A CN 112592700 B CN112592700 B CN 112592700B
- Authority
- CN
- China
- Prior art keywords
- oil
- drilling fluid
- based drilling
- chlorinated paraffin
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The oil-based drilling fluid is nontoxic to human bodies, can not burn, is safer and more environment-friendly, can reduce the using amount of the emulsifier, has lower cost per se, can greatly reduce the production cost of the oil-based drilling fluid, has high density, good lubricity, good rheological property and good emulsion stability, and can be widely applied to drilling operations of horizontal wells, directional wells, ultra-deep wells, sections easy to collapse, strata with complex water sensitivity and the like.
Description
Technical Field
The invention relates to the technical field of oil-based drilling fluids, in particular to an oil-based drilling fluid based on chlorinated paraffin and a preparation method and application thereof.
Background
Drilling fluids are circulating fluids used in oil and gas drilling processes and can be generally divided into water-based drilling fluids, oil-based drilling fluids and gas-based drilling fluids according to the difference of dispersion media. The oil-based drilling fluid is a suspension mixing system which takes oil as a dispersion medium, additives such as an emulsifier, a filtrate reducer, a weighting agent, organic soil and the like and water as a dispersion phase, has the advantages of high temperature resistance, salt erosion resistance, good lubricity, contribution to well wall stability, low damage degree to an oil-gas layer and the like, and is currently applied to drilling of high-temperature deep wells, large-slope directional wells, horizontal wells and various high-difficulty and complex strata.
At present, the base oil of the oil-based drilling fluid is mainly mineral oil, such as diesel oil and white oil, but the base oil has obvious defects and mainly appears in the following two aspects: (1) the environment-friendly performance is poor, the aromatic hydrocarbon content in the diesel oil is high, the toxicity is high, the fluorescent logging is interfered, the flash point of the mineral oil is low, the mineral oil is easy to burn, and the use safety is poor. (2) The cost is high, and because the base oil cost is higher, the water-in-oil type oil-based drilling fluid is generally adopted at present for reducing the cost, but the volume fraction of the base oil is still more than 60 percent; in order to form a stable water-in-oil emulsion, a large amount of emulsifier is added into the system, so that the cost is further increased; if the biodiesel is used as the base oil, although the biodiesel is environment-friendly, the cost is high. There are a few reports about the application of chlorinated paraffin in drilling fluid, but chlorinated paraffin is used as lubricant for improving the lubricating property of water-based drilling fluid and playing roles of releasing seizes and increasing speed, for example, patent CN103642467B discloses a low-fluorescence anti-seize lubricant for drilling fluid and a preparation method thereof, wherein 17.3% of chlorinated paraffin is one of the synthetic raw materials of the lubricant for water-based drilling fluid; liujian Jun et al, in article "Performance study of Low-fluorescence high-efficiency extreme pressure Lubricant BDLU-100L for drilling fluid", add quantitative chlorinated paraffin to white oil to prepare lubricant for water-based drilling fluid (see "oilfield chemistry", 2016(33): 2). However, the above technology only adds a small amount of oil phase containing chlorinated paraffin into the water-based drilling fluid to form an oil-in-water emulsion to prepare the lubricant, and cannot change the defects of the traditional water-based drilling fluid and cannot be called as an oil-based drilling fluid. Chinese patent CN106634888A discloses a high-water-phase oil-based drilling fluid suitable for shale gas long-horizontal segments, which is an oil-based drilling fluid with low oil-water ratio and good lubricity, prepared by using No. 0 diesel oil, No. 5 white oil or gas oil as base oil and adding assistants such as efficient emulsifier, nano plugging agent and the like, but the used base oil has high cost, and the problem of poor environmental protection and safety performance is caused by using base oil which is toxic and easy to burn.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings of the existing oil-based drilling fluid that the existing oil-based drilling fluid is not safe and environment-friendly enough, and provide the oil-based drilling fluid based on the chlorinated paraffin, which has the characteristics of no toxicity, environment friendliness, incombustibility, good safety performance, high density, good lubricity and good rheological property, and in addition, the base oil has low cost.
The invention also aims to provide a preparation method of the oil-based drilling fluid based on the chlorinated paraffin.
It is a further object of the present invention to provide a use of a chlorinated paraffin-based oil-based drilling fluid.
The above purpose of the invention is realized by the following technical scheme:
the oil-based drilling fluid based on chlorinated paraffin comprises a base fluid and an additive, wherein the base fluid comprises 60-90 parts by volume of chlorinated paraffin and 10-40 parts by volume of an inorganic salt aqueous solution; wherein the mass content of chlorine element in the chlorinated paraffin is 5-70%; the additive is added according to the volume weight ratio, and comprises 0.5-3% of composite emulsifier and 2-8% of composite viscosity reducer.
Chlorinated paraffin, also called chloroalkane, is prepared by chlorination substitution reaction of alkane, ester and chlorine, mainly C10～C30Of the general formula CnH(2n+2)-xClxThe chlorinated paraffin base oil has the advantages of low volatility, high and low temperature resistance, flame retardance, electric insulation, low cost, no aromatic hydrocarbon and the like, and the chlorinated paraffin base oil uses chlorinated paraffin with a certain chlorine content as base oil to replace the existing base oil with poor environmental protection property and is used as base liquid together with inorganic salt water solution (salt water). In addition, the chlorinated paraffin has a certain emulsifying capacity due to the fact that the chlorinated paraffin contains a large number of polar groups, the dosage of an emulsifier in the oil-based drilling fluid can be reduced, and further the cost is reduced. The chlorinated paraffin can also increase the product density and reduce the solid phase content of the oil-based drilling fluid by adjusting the chlorine content, does not need to add a large amount of barite and iron ore powder to aggravate the oil-based drilling fluid, avoids the problems of poor rheological property and increased filtration loss of the oil-based drilling fluid caused by the introduction of a large amount of solid phase particles, improves the performance of the oil-based drilling fluid, and reduces the cost. The chlorinated paraffin can form a firm chlorinated metal film on the surface of metal under higher pressure, so that the friction coefficient is reduced, the lubricating property of the oil-based drilling fluid is improved, the adhesion of rock debris on the surface of a drill string in the drilling process can be reduced, the drilling sticking accident is prevented, and the drilling speed is obviously improved. And the chlorinated paraffin has a flash point higher than 200 ℃, is incombustible, has self-extinguishing property and has better safety performance. In addition, the composite viscosity reducer is matched with the chlorinated paraffin for use, so that the problem of high plastic viscosity of the chlorinated paraffin is solved, and the oil-based drilling fluid has good rheological property. In addition, the chlorinated paraffin has high capacity in China at present, and the chlorinated paraffin serving as base oil can obviously reduce the cost.
Preferably, the base fluid comprises 70-85 parts by volume of chlorinated paraffin and 15-30 parts by volume of inorganic salt aqueous solution.
Preferably, the mass content of the chlorine element in the chlorinated paraffin is 39-60%.
Preferably, the additive comprises 1.5-3% of composite emulsifier and 3-5% of composite viscosity reducer which are added according to the volume weight ratio.
Preferably, the mass concentration of the inorganic salt water solution is 15-35%.
Preferably, the composite emulsifier is one or more of a sorbitan fatty acid ester nonionic surfactant, a polyoxyethylene sorbitan fatty acid ester nonionic surfactant, a higher fatty acid salt surfactant and a nano material.
More preferably, the composite emulsifier is a mixture of a sorbitan fatty acid ester nonionic surfactant, a polyoxyethylene sorbitan fatty acid ester nonionic surfactant, a higher fatty acid salt surfactant and a nano material in a mass ratio of 1: 1-2: 0.5-1: 0.1-0.5.
The sorbitan fatty acid ester nonionic surfactant provided by the invention comprises one or more of Span20, Span40, Span60 and Span 80.
The polyoxyethylene sorbitan fatty acid ester nonionic surfactant provided by the invention comprises one or more of Tween20, Tween40, Tween60 and Tween 80.
The higher fatty acid salt-type surfactant of the present invention includes, but is not limited to, sodium or calcium salts of fatty acids or polyamide fatty acids; the nano material is hydrophobic nano silicon dioxide, and the particle size is 10-100 nm.
Preferably, the HLB value of the composite emulsifier is 2-6.
According to the invention, by adding the composite emulsifier, a stable water-in-oil emulsion can be formed under a lower emulsifier dosage, wherein the nano material is beneficial to forming Pickering emulsion, the high-temperature stability of the emulsion can be obviously improved, and the drilling fluid filtration loss is reduced.
Preferably, the composite viscosity reducer is a mixture of an oil-soluble viscosity reducer and a lower alcohol with the carbon number of C3-C6.
More preferably, the composite viscosity reducer is a mixture of an oil-soluble viscosity reducer and a low-carbon alcohol in a mass ratio of 1: 1-5.
Preferably, the oil-soluble viscosity reducer is a low molecular weight oil-soluble polymer containing polar groups.
More preferably, the oil soluble viscosity reducer is an ethylene acrylate copolymer or an ethylene vinyl acetate maleic anhydride copolymer.
Preferably, the lower alcohol is a normal alcohol or an isomeric alcohol with 3-6 carbon atoms.
More preferably, the lower alcohol is one or more of n-amyl alcohol, n-hexyl alcohol, n-butyl alcohol, isoamyl alcohol and isobutyl alcohol.
Preferably, the additive also comprises a fluid loss additive, an organic soil, an alkalinity regulator and a weighting agent.
Preferably, the additive comprises 2-4% of the fluid loss additive added according to the volume weight ratio.
Preferably, the additive comprises 0.5-2.5% of organic soil added according to volume weight ratio.
Preferably, the additive comprises 0.5-3% of alkalinity regulator added according to volume weight ratio.
Preferably, the weighting agent is added according to the requirement, and the density of the drilling fluid is adjusted to be 1.2-2.5 g/cm3。
The fluid loss additive comprises one or more of, but is not limited to, oxidized asphalt powder, sulfonated asphalt powder, organic brown coal powder, rubber powder and humic acid amide.
Preferably, the fluid loss additive is oxidized asphalt powder and organic brown coal powder, and the mass ratio of the oxidized asphalt powder to the organic brown coal powder is 1-3: 1.
The organic soil of the invention includes, but is not limited to, bentonite modified by quaternary ammonium salt cationic surfactant.
The alkalinity regulator of the invention comprises one or more of calcium oxide, calcium hydroxide and magnesium oxide.
The weighting agent provided by the invention comprises one or more of limestone, barite and hematite.
The preparation method of the oil-based drilling fluid comprises the following steps:
the oil-based drilling fluid is prepared by uniformly mixing chlorinated paraffin, a composite viscosity reducer and a composite emulsifier to prepare an oil phase solution, adding an inorganic salt water solution and uniformly mixing to prepare a drilling fluid base fluid, adding a required filtrate reducer, organic soil, an alkalinity regulator and a weighting agent and uniformly mixing.
The invention also protects the application of the oil-based drilling fluid in drilling operation.
Compared with the prior art, the invention has the beneficial effects that:
the oil-based drilling fluid is prepared by using chlorinated paraffin as base oil and mixing the chlorinated paraffin with an inorganic salt aqueous solution, a composite emulsifier, a composite viscosity reducer and other additives in a certain ratio, wherein the chlorinated paraffin is non-toxic to a human body and can not be combusted, the oil-based drilling fluid is safer and more environment-friendly, the chlorinated paraffin has certain emulsifying capacity, the using amount of the emulsifier in the oil-based drilling fluid can be reduced, the cost of the chlorinated paraffin is lower, the production cost of the oil-based drilling fluid can be greatly reduced, the chlorine content of the chlorinated paraffin can be adjusted, the product density can be increased, and the prepared oil-based drilling fluid is high in density, good in lubricity, good in rheological property, lower in filtration loss and higher in electric stability, and can be widely applied to drilling operations of horizontal wells, directional wells, ultra-deep wells, easily collapsed well sections, water-sensitive complex strata and the like.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
The raw materials used in the examples and comparative examples illustrate:
chlorinated paraffin: normal paraffin is used as raw material, the chlorine content is 39%, 42% and 52%, the brands are respectively chlorinated paraffin-39 #, chlorinated paraffin-42 #, and chlorinated paraffin-52 #; manufactured by Guangzhou Jiang salt chemical Co., Ltd;
fluid loss additive (brand: HFLO): purchased from hong Hua oil and gas field engineering, Inc., Sichuan;
barite powder (grade II): purchased from hong Hua oil and gas field engineering, Inc., Sichuan;
composite viscosity reducer (brand: JNA-1): ethylene vinyl acetate copolymer isoamyl alcohol 1:2, produced by Guangzhou Jiangjiang salt chemical Co., Ltd;
composite emulsifier (trade name: EMA-1): span60, Tween60, calcium stearate, 50nm hydrophobic silica 1:1:1:0.2, produced by Guangzhou Jiangjiang salt chemical Co., Ltd;
organic soil (trade name: HFGEL-120): purchased from Zhejiang Fenghong New materials, Inc.;
and (3) the rest raw materials: purchased from chemical agents, Inc., of the national drug group.
Example 1
The chlorinated paraffin-based oil-based drilling fluid comprises a base fluid and an additive, wherein the total amount of the base fluid is 400mL, the base fluid comprises 80 parts by volume of chlorinated paraffin-52 # and 20 parts by volume of an inorganic salt aqueous solution (25% calcium chloride solution); the additive is added according to the volume weight ratio, and the additive comprises: 5% of composite viscosity reducer (ethylene-vinyl acetate copolymer: isoamyl alcohol 1:2), 1.5% of composite emulsifier (Span60: Tween60: calcium stearate: 50nm hydrophobic silica 1:1:1:0.2), 1% of organic soil, 2.5% of fluid loss additive (oxidized asphalt: organic lignite 1:2) and 2% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid comprises the following steps:
under the condition of high-speed stirring, adding the composite viscosity reducer into chlorinated paraffin, stirring for 30min, then adding the composite emulsifier to fully dissolve the composite viscosity reducer, and preparing to obtain an oil phase solution; slowly adding the calcium chloride solution into the oil phase solution under the condition of high-speed stirring, and continuously stirring for 30min to uniformly mix to obtain emulsion; under the condition of high-speed stirring, sequentially adding organic soil, a filtrate reducer, an alkalinity regulator and a weighting agent into the emulsion to prepare the oil-based drilling fluid, wherein after each additive is added, stirring is required for 30min, and then the next additive can be added, and the prepared oil-based drilling fluid can be subjected to performance measurement after being sealed and kept stand for 24 h; the stirrer is a GJ-3S digital display high-speed stirrer and a matched stainless steel high-speed stirring cup, the high-speed stirring speed is 10000r/min, and the stirring time is more than 30min so as to ensure that the materials are uniformly mixed.
Example 2
The oil-based drilling fluid based on chlorinated paraffin is prepared by changing the type of base oil, the concentration of brine, the volume ratio of base fluid and the type and the dosage of additives on the basis of the formula of example 1, and the specific formula comprises the following components in parts by weight: the additive comprises base liquid and additives, wherein the total amount of the base liquid is 400mL, the base liquid comprises 75 parts by volume of chlorinated paraffin-42 # and 25 parts by volume of inorganic salt aqueous solution (30% calcium chloride solution); the additive is added according to the volume weight ratio, and the additive comprises: 6% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:4), 1.0% of composite emulsifier (Span20: Tween80: sodium oleate: 20nm hydrophobic silica 1:1:1:0.2), 1.5% of organic soil, 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), and 1.5% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 3
An oil-based drilling fluid based on chlorinated paraffin is prepared by changing base oil into chlorinated paraffin-52 # on the basis of a formula in example 2, and the specific formula is as follows: the base fluid comprises a base fluid and an additive, wherein the base fluid comprises base oil chlorinated paraffin-52 #75 parts by volume: 25 parts of 30% calcium chloride solution; the additive is added according to the volume weight ratio, and the additive comprises: 6% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:4), 1.0% of composite emulsifier (Span20: Tween80: sodium oleate: 20nm hydrophobic silica 1:1:1:0.2), 1.5% of organic soil, 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), and 1.5% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 4
An oil-based drilling fluid based on chlorinated paraffin is prepared by changing base oil into chlorinated paraffin-39 # on the basis of a formula in example 2, and the specific formula is as follows: the additive comprises base liquid and an additive, wherein the base liquid comprises 400mL of the total amount of the base liquid, 75 parts of chlorinated paraffin-39 # and 25 parts of saline (30% calcium chloride solution) according to parts by volume; the additive is added according to the volume weight ratio, and the additive comprises: 6% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:4), 1.0% of composite emulsifier (Span20: Tween80: sodium oleate: 20nm hydrophobic silica 1:1:1:0.2), 1.5% of organic soil, 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), and 1.5% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 5
The chlorinated paraffin-based oil-based drilling fluid is prepared by changing the volume ratio of base fluid, the types and the dosage of additives on the basis of the formula of example 2, and the specific formula is as follows: the additive comprises a base fluid and an additive, wherein the base fluid comprises 400mL of the total amount of the base fluid, 85 parts of chlorinated paraffin-52 # and 15 parts of saline (25% calcium chloride solution) according to parts by volume; the additive is added according to the volume weight ratio, and the additive comprises: 4% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:4), 1.0% of composite emulsifier (Span20: Tween80: calcium stearate: 20nm hydrophobic silica 1:2:1:0.4), 1.5% of organic soil, 2.0% of fluid loss additive (sulfonated asphalt: humic acid amide 2:1), and 2.5% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 6
The chlorinated paraffin-based oil-based drilling fluid is prepared by changing the brine concentration, the volume ratio of base fluid, the types and the dosage of additives on the basis of the formula of example 2, and the specific formula is as follows: the additive comprises a base fluid and an additive, wherein the base fluid comprises 400mL of the total amount of the base fluid, the base fluid comprises 70 parts by volume of chlorinated paraffin-52 #, 30 parts by volume of saline (20% calcium chloride solution), and the additive comprises: 3% of composite viscosity reducer (ethylene-vinyl acetate copolymer: isoamyl alcohol 1:5), 2.8% of composite emulsifier (Span40: Tween60: sodium polyamide fatty acid salt: 100nm hydrophobic silicon dioxide 1:2:0.5:0.4), 2.5% of organic soil, 2.5% of filtrate reducer (oxidized asphalt: humic acid amide 1:1), and 2.0% of alkalinity regulator (calcium hydroxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 7
The oil-based drilling fluid based on chlorinated paraffin is prepared by changing the types and the dosage of additives on the basis of the formula of an example 2, and the specific formula is as follows: the additive comprises base liquid and an additive, wherein the base liquid comprises 400mL of the total amount of the base liquid, the base liquid comprises 80 parts of chlorinated paraffin-52 # and 20 parts of saline 25% calcium chloride solution by volume, and the additive comprises: 2% of composite viscosity reducer (ethylene acrylate copolymer: isoamyl alcohol ═ 1:4), 1.5% of composite emulsifier (Span40: Tween60: sodium polyamide fatty acid: 100nm hydrophobic silica ═ 1:2:0.5:0.4), 2.5% of organic soil, 2.0% of filtrate reducer (oxidized asphalt: organic lignite ═ 1:1), and 2.0% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 8
The chlorinated paraffin-based oil-based drilling fluid is prepared by changing the volume ratio of base fluid, the types and the dosage of additives on the basis of the formula of example 2, and the specific formula is as follows: the additive comprises base liquid and an additive, wherein the base liquid comprises, by volume, 400mL of the total amount of the base liquid, 75 parts of chlorinated paraffin-52 #, 25 parts of saline (25% calcium chloride solution), and the additive comprises: 4% of composite viscosity reducer (ethylene acrylate copolymer: isoamyl alcohol ═ 1:4), 0.8% of composite emulsifier (Span40: Tween60: sodium polyamide fatty acid: 100nm hydrophobic silica ═ 1:2:0.5:0.4), 2.5% of organic soil, 3.0% of filtrate reducer (oxidized asphalt: organic lignite ═ 1:1), and 2.0% of alkalinity regulator (calcium oxide).
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 9
The oil-based drilling fluid based on chlorinated paraffin is prepared by changing the density of the drilling fluid and the types and the dosage of additives on the basis of the formula of example 1, and the specific formula is as follows: the total amount of the base fluid is 400mL, the base fluid comprises 80 parts by volume of chlorinated paraffin-52 #, 20 parts by volume of saline (25% calcium chloride solution) and an additive: 8% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:4), 1.5% of composite emulsifier (Span20: Tween80: calcium stearate: 20nm hydrophobic silica 1:2:1:0.4), 1.5% of organic soil (organic soil), 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), 2.5% of alkalinity regulator (calcium oxide), and barite is weighted to 1.8g/cm3。
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 10
The oil-based drilling fluid based on chlorinated paraffin is prepared by changing the density of the drilling fluid on the basis of the formula of example 1, and the specific formula is as follows: the additive comprises a base fluid and an additive, wherein the base fluid comprises 400mL of the total amount of the base fluid, the base fluid comprises 80 parts by volume of chlorinated paraffin-52 #, 20 parts by volume of saline (25% calcium chloride solution), and the additive comprises: 8% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:2), 1.5% of composite emulsifier (Span20: Tween80: calcium stearate: 20nm hydrophobic silica 1:2:1:0.4), 1.5% of organic soil, 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), 2.5% of alkalinity regulator (calcium oxide), and barite is weighted to 2.0g/cm3。
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Example 11
The oil-based drilling fluid based on chlorinated paraffin is prepared by changing the density of the drilling fluid on the basis of the formula of example 11, and the specific formula is as follows: the additive comprises a base fluid and an additive, wherein the base fluid comprises 400mL of the total amount of the base fluid, the base fluid comprises 80 parts by volume of chlorinated paraffin-52 #, 20 parts by volume of saline (25% calcium chloride solution), and the additive comprises: 8% of composite viscosity reducer (ethylene acrylate copolymer: n-amyl alcohol 1:2), 1.5% of composite emulsifier (Span20: Tween80: calcium stearate: 20nm hydrophobic silica 1:2:1:0.4), 1.5% of organic soil, 2.0% of filtrate reducer (sulfonated asphalt: humic acid amide 2:1), 2.5% of alkalinity regulator (calcium oxide), and barite is weighted to 2.2g/cm3。
The preparation method of the oil-based drilling fluid based on the chlorinated paraffin is the same as that of the example 1.
Comparative example 1
The components and preparation method of the oil-based drilling fluid of the comparative example are the same as those of example 1, and the difference is that chlorinated paraffin is replaced by 0# diesel oil, and the composite viscosity reducer and the weighting agent are removed to prepare the oil-based drilling fluid.
Comparative example 2
The components and preparation method of the oil-based drilling fluid of the comparative example are the same as those of example 1, and the difference is that chlorinated paraffin is replaced by 5# white oil, and the composite viscosity reducer and the weighting agent are removed to prepare the oil-based drilling fluid.
Performance testing
1. Test method
The oil-based drilling fluid testing method provided by the invention is as follows according to the national standard GB 16783.2-2012' petroleum and natural gas industry drilling fluid field testing part 2: the method comprises the following steps of measuring the performance of the oil-based drilling fluid by using the oil-based drilling fluid and a lubricant evaluation program for drilling fluid of a petroleum and natural gas industry standard SY/T6094-94, wherein the program comprises the following steps:
(1) measuring the density of the oil-based drilling fluid by using a YM-1 liquid densimeter;
(2) measuring the rheological property of the oil-based drilling fluid by using an ZNN-D6B electric six-speed rotary viscometer;
(3) measuring the electrical stability of the oil-based drilling fluid at 50 ℃ by using a DWY-2 electrical stability tester;
(4) measuring the API (oil-based drilling fluid) filtration loss of the oil-based drilling fluid by using an SD4 quadruple water loss instrument;
(5) measuring the high-temperature high-pressure filtration loss of the oil-based drilling fluid by using a GGS71-A high-temperature high-pressure water loss instrument at 120 ℃ and 3.5 MPa;
(6) measuring the pH value of the oil-based drilling fluid by using a PHS-25 type pH meter;
(7) measuring the lubrication coefficient of the oil-based drilling fluid by using an EP-2A extreme pressure lubricator;
(8) and hot rolling for 16h at 120 ℃ by using an XGRL-5 roller heating furnace and a matched stainless steel aging tank for post-rolling test.
2. Test results
TABLE 1 Performance indices of different base oils
As can be seen from Table 1, compared with diesel oil and white oil, the viscosity of the chlorinated paraffin after the viscosity reducer is added is obviously reduced, and is only slightly higher than that of 0# diesel oil and 5# white oil, but the density is obviously increased, and the chlorinated paraffin has the advantages of high-temperature stability, high low-temperature stability, high flash point, incombustibility, low aromatic hydrocarbon content and no toxicity, so that the chlorinated paraffin is very obvious in safety and environmental friendliness when used as an oil-based drilling fluid.
TABLE 2 Effect of different base oil types on oil based drilling fluids Performance
As can be seen from table 2, the density of the oil-based drilling fluid using chlorinated paraffin as the base oil in example 1 is significantly increased compared with the oil-based drilling fluid prepared from diesel oil and white oil of comparative examples 1 and 2 without weighting agent, which indicates that the chlorinated paraffin as the base oil can increase the density of the oil-based drilling fluid, the apparent viscosity and the plastic viscosity are slightly higher, but the performance of the oil-based drilling fluid in actual work is not affected, and the dynamic shear force, dynamic-plastic ratio, electrical stability, filtration loss, temperature resistance and lubricating performance of the oil-based drilling fluid are better, which indicates that the performance is better under the same formulation conditions; meanwhile, the chlorinated paraffin serving as the base oil has more advantages in cost and environmental protection compared with the traditional diesel oil and white oil.
TABLE 3 influence of chlorine content of different chlorinated paraffins on oil-based drilling fluids Performance
As can be seen from table 3, as the chlorine content of the chlorinated paraffin increases, the oil-based drilling fluid density and viscosity also increase without changing other additives; and the oil-based drilling fluid taking the chlorinated paraffin with different chlorine contents as the base oil has better rheological property, lower filtration loss and higher electrical stability.
TABLE 4 Effect of different additive types and amounts on oil-based drilling fluids Performance
As can be seen from Table 4, the oil-based drilling fluid can maintain good performance by changing the types and the amounts of the composite viscosity reducer and the composite emulsifier, and the performance of the oil-based drilling fluid is not greatly affected.
TABLE 5 Effect of different weighting agent dosages on oil-based drilling fluids Performance
As can be seen from table 5, as the density of the weighting agent increases, the rheological property and the fluid loss reduction performance of the oil-based drilling fluid also decrease, but the decrease is not large, mainly because the chlorinated paraffin is also added into the system, so the dosage of the weighting agent is not large, the effect is not large although the performance is reduced, and the overall performance is still superior to that of the conventional oil-based drilling fluid.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The oil-based drilling fluid based on chlorinated paraffin is characterized by comprising a base fluid and an additive, wherein the base fluid comprises 60-90 parts by volume of chlorinated paraffin and 10-40 parts by volume of an inorganic salt aqueous solution; wherein the mass content of chlorine element in the chlorinated paraffin is 5-70%; the additives are added according to the volume weight ratio, and comprise 0.5-3% of composite emulsifier and 2-8% of composite viscosity reducer;
the composite viscosity reducer is a mixture of an oil-soluble viscosity reducer and low-carbon alcohol in a mass ratio of 1: 1-5; the oil-soluble viscosity reducer is an ethylene acrylate copolymer or an ethylene vinyl acetate maleic anhydride copolymer; the lower alcohol is one or more of n-pentanol, n-hexanol, n-butanol, isoamylol and isobutanol.
2. The oil-based drilling fluid according to claim 1, wherein the base fluid comprises 70 to 85 parts by volume of chlorinated paraffin and 15 to 30 parts by volume of an aqueous solution of an inorganic salt.
3. The oil-based drilling fluid according to claim 1 or 2, wherein the chlorinated paraffin has a chlorine content of 39 to 60% by mass.
4. The oil-based drilling fluid of claim 1, wherein the additive comprises 1.5-3% of composite emulsifier and 3-5% of composite viscosity reducer.
5. The oil-based drilling fluid according to claim 1, wherein the mass concentration of the aqueous inorganic salt solution is 15 to 35%.
6. The oil-based drilling fluid of claim 1, wherein the composite emulsifier is one or more of a sorbitan fatty acid ester nonionic surfactant, a polyoxyethylene sorbitan fatty acid ester nonionic surfactant, a higher fatty acid salt surfactant and a nano material.
7. The oil-based drilling fluid of claim 1, wherein the additive further comprises a fluid loss additive, an organic soil, an alkalinity regulator, and a weighting agent.
8. The method for preparing the oil-based drilling fluid according to any one of claims 1 to 7, comprising the steps of:
the oil-based drilling fluid is prepared by uniformly mixing chlorinated paraffin, a composite viscosity reducer and a composite emulsifier to prepare an oil phase solution, adding an inorganic salt water solution and uniformly mixing to prepare a drilling fluid base fluid, adding a required filtrate reducer, organic soil, an alkalinity regulator and a weighting agent and uniformly mixing.
9. Use of the oil-based drilling fluid of any one of claims 1 to 7 in drilling operations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530687.1A CN112592700B (en) | 2020-12-22 | 2020-12-22 | Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530687.1A CN112592700B (en) | 2020-12-22 | 2020-12-22 | Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112592700A CN112592700A (en) | 2021-04-02 |
| CN112592700B true CN112592700B (en) | 2022-04-29 |
Family
ID=75200186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011530687.1A Active CN112592700B (en) | 2020-12-22 | 2020-12-22 | Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112592700B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112592701B (en) * | 2020-12-22 | 2022-08-09 | 广州江盐化工有限公司 | Oil-based drilling fluid based on chlorinated fatty acid ester and preparation method and application thereof |
| CN115975613B (en) * | 2021-10-14 | 2024-04-05 | 中石化石油工程技术服务有限公司 | Alpha-olefin base fluid and application thereof in drilling fluid |
| CN114957556B (en) * | 2022-06-14 | 2024-04-05 | 天津渤海中联石油科技有限公司 | Fluid loss additive, preparation method and application thereof, and oil-based drilling fluid |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100599A (en) * | 2006-07-07 | 2008-01-09 | 中国石油天然气股份有限公司 | Oil-soluble high-concentration pour point depressant suspension and preparation method thereof |
| CN102260487A (en) * | 2010-05-28 | 2011-11-30 | 延增国 | Method for preparing fast drilling additive of drilling fluid |
| CN102575021A (en) * | 2009-09-25 | 2012-07-11 | 阿克马法国公司 | Masterbatch for manufacturing a drilling fluid |
| CN103642467A (en) * | 2013-12-10 | 2014-03-19 | 湖北龙海化工有限公司 | Low-fluorescence anti-seize lubricant for drilling fluid and preparation method thereof |
| CN105524599A (en) * | 2016-01-12 | 2016-04-27 | 潍坊天福化学科技有限公司 | Lubricant for drilling fluid and preparation method for lubricant for drilling fluid |
| CN112592701A (en) * | 2020-12-22 | 2021-04-02 | 广州江盐化工有限公司 | Oil-based drilling fluid based on chlorinated fatty acid ester and preparation method and application thereof |
| CN113416523A (en) * | 2021-06-23 | 2021-09-21 | 成都西油华巍科技有限公司 | Oil-based gelling plugging agent |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7842651B2 (en) * | 2007-12-18 | 2010-11-30 | Chengdu Cationic Chemistry Company, Inc. | Silicate drilling fluid composition containing lubricating agents and uses thereof |
-
2020
- 2020-12-22 CN CN202011530687.1A patent/CN112592700B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100599A (en) * | 2006-07-07 | 2008-01-09 | 中国石油天然气股份有限公司 | Oil-soluble high-concentration pour point depressant suspension and preparation method thereof |
| CN102575021A (en) * | 2009-09-25 | 2012-07-11 | 阿克马法国公司 | Masterbatch for manufacturing a drilling fluid |
| CN102260487A (en) * | 2010-05-28 | 2011-11-30 | 延增国 | Method for preparing fast drilling additive of drilling fluid |
| CN103642467A (en) * | 2013-12-10 | 2014-03-19 | 湖北龙海化工有限公司 | Low-fluorescence anti-seize lubricant for drilling fluid and preparation method thereof |
| CN105524599A (en) * | 2016-01-12 | 2016-04-27 | 潍坊天福化学科技有限公司 | Lubricant for drilling fluid and preparation method for lubricant for drilling fluid |
| CN112592701A (en) * | 2020-12-22 | 2021-04-02 | 广州江盐化工有限公司 | Oil-based drilling fluid based on chlorinated fatty acid ester and preparation method and application thereof |
| CN113416523A (en) * | 2021-06-23 | 2021-09-21 | 成都西油华巍科技有限公司 | Oil-based gelling plugging agent |
Non-Patent Citations (2)
| Title |
|---|
| Dermal Exposure to Metalworking Fluids and Medium-Chain Chlorinated Paraffin;john W.;《The annals of occupational hygiene》;20100330;第54卷(第2期);第228-235页 * |
| 钻井液用低荧光高效极压润滑剂BDLU-100L的性能研究;刘建军 等;《油田化学》;20160629;第33卷(第02期);第200-203页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112592700A (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112592700B (en) | Oil-based drilling fluid based on chlorinated paraffin and preparation method and application thereof | |
| CN102304353B (en) | Environmental-friendly type oil-based drilling fluid and preparation method thereof | |
| CN112592701B (en) | Oil-based drilling fluid based on chlorinated fatty acid ester and preparation method and application thereof | |
| PT713909E (en) | LUBRICANT COMPOSITION THAT COMPOSITES AN ESTER - USE OF COMPOSITION AND FLUID FOR FEW COMPORING COMPOSITION | |
| CN101124307B (en) | Additive for reducing torque on a drill string | |
| CN105189694B (en) | Additives for oil-based drilling fluids | |
| US9528043B2 (en) | Compositions and methods for treatment of well bore tar | |
| CN107325797B (en) | Low oil-water ratio oil-based drilling fluid and preparation method thereof | |
| Elkatatny et al. | Properties of ilmenite water-based drilling fluids For HPHT applications | |
| CN109072059B (en) | Inverse emulsion drilling fluid | |
| CN109266319B (en) | Full-oil-based drilling fluid and preparation method and application thereof | |
| CN110225956A (en) | Oil based fluids composition for hydrocarbon exploitation application | |
| CN110564387B (en) | Ultrahigh-density environment-friendly gas-to-oil synthetic base drilling fluid and preparation method thereof | |
| US11124687B2 (en) | Synthesized lubricants for water-based drilling fluid systems | |
| US11390792B2 (en) | Clay-free drilling fluid composition | |
| Xiao | Experimental Studies of Ilmenite as a Weighting Material in Oil-based Drilling Fluids for HPHT Operations | |
| Huang et al. | Performance evaluation of trimethylolpropane ester as high-temperature resistant lubricant for high performance water-based drilling fluids | |
| CN109762539A (en) | A kind of New drilling fluid oil lubricant and its synthetic method | |
| CN111676004A (en) | High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |