CN114686189A - Lubricant for water-based drilling fluid, preparation method of lubricant and water-based drilling fluid - Google Patents
Lubricant for water-based drilling fluid, preparation method of lubricant and water-based drilling fluid Download PDFInfo
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- CN114686189A CN114686189A CN202210430855.2A CN202210430855A CN114686189A CN 114686189 A CN114686189 A CN 114686189A CN 202210430855 A CN202210430855 A CN 202210430855A CN 114686189 A CN114686189 A CN 114686189A
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
Abstract
The invention provides a lubricant for a water-based drilling fluid, a preparation method thereof and the water-based drilling fluid, wherein the lubricant for the water-based drilling fluid comprises the following components: 70-80 parts of base oil, 2-5 parts of nonionic surfactant, 1-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 10-20 parts of water. The preparation method of the lubricant for the water-based drilling fluid comprises the following steps: adding 70-80 parts by weight of base oil into a reaction container, stirring, adding 2-5 parts by weight of nonionic surfactant, and stirring for 20-30 minutes; continuously adding 1-3 parts of extreme pressure antiwear agent, and stirring for 10-20 minutes; adding 2-3 parts of pour point depressant, and stirring for 20-30 minutes; and continuously adding 10-20 parts of water, and stirring for 20-30 minutes to obtain the lubricant for the water-based drilling fluid. The lubricant for the water-based drilling fluid has the advantages of good lubricating property and high temperature resistance, simple preparation process and the like.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to a lubricant for water-based drilling fluid, a preparation method of the lubricant and the water-based drilling fluid.
Background
The shale gas long horizontal section horizontal well technology has the technical advantages of greatly improving the oil gas yield and the recovery ratio, and has remarkable development benefit on oil gas reservoirs. However, because the shale gas horizontal well section is long, in the drilling process, the rock debris can sink to the lower well wall, and the flow rate of the drilling fluid of the lower well wall is very slow, so the rock debris can be accumulated on the lower well wall to form a rock debris bed, once the thickness of the rock debris bed reaches a certain value, the construction efficiency can be affected, and safety problems occur, such as complex situations of tripping, drilling resistance blocking and the like.
At present, no unified solution is provided for a shale gas horizontal well section detritus bed to drilling tool friction torque, a traditional solution generally uses lubricants such as emulsified paraffin, asphalt, diesel oil, white oil and the like to reduce friction between a drill string and a well wall (mud cake), the friction between the drill string and detritus is rarely involved, and according to a field practice surface, the friction problem between the drill string and detritus cannot be effectively solved by using the traditional lubricants.
Therefore, there is a need to develop a lubricant capable of reducing friction between a drill string and rock debris to improve the efficiency of shale gas horizontal well construction.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the objects of the present invention is to provide a lubricant for a water-based drilling fluid, which can reduce friction between a drill string and rock debris and has good lubricating performance and good temperature resistance, a preparation method thereof, and the water-based drilling fluid.
In order to achieve the above objects, an aspect of the present invention provides a lubricant for a water-based drilling fluid, which may include:
70-80 parts of base oil, 2-5 parts of nonionic surfactant, 1-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 10-20 parts of water.
In one exemplary embodiment of an aspect of the present invention, the lubricant includes:
the lubricant comprises, by weight, 72-78 parts of base oil, 3-4.5 parts of nonionic surfactant, 1.5-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 12-18 parts of water.
In an exemplary embodiment of an aspect of the present invention, the base oil may include at least one of pentaerythritol ester, polyethylene glycol ether, and methyl silicone oil;
the nonionic surfactant may include at least one of SP-80, OP-10, or TW-80.
In one exemplary embodiment of an aspect of the present invention, the extreme pressure antiwear agent may include at least one of trimethylphenol phosphate, α -mercaptobenzothiazole, and triphenyl thiophosphate;
the pour point depressant is alkyl naphthalene, which may include at least one of methyl naphthalene, ethyl naphthalene, and propyl naphthalene.
In another aspect of the present invention, there is provided a method of preparing a lubricant for a water-based drilling fluid, the method comprising the steps of:
adding 70-80 parts by weight of base oil into a reaction container, stirring, adding 2-5 parts by weight of nonionic surfactant, and continuing stirring for 20-30 minutes;
adding 1-3 parts of extreme pressure antiwear agent into a reaction container, and stirring for 10-20 minutes; adding 2-3 parts of pour point depressant alkyl naphthalene, and stirring for 20-30 minutes;
and continuously adding 10-20 parts of water, and stirring for 20-30 minutes to obtain the lubricant for the water-based drilling fluid.
In an exemplary embodiment of another aspect of the present invention, the rotation speed of the stirring may be 800 to 1200r/min, and the temperature in the reaction vessel may be 30 to 40 ℃.
Yet another aspect of the present invention provides a water-based drilling fluid that may include:
100 parts by weight of water, 3-12 parts by weight of bentonite, 0.1-1.1 parts by weight of sodium carbonate, 0.001-0.3 parts by weight of sodium hydroxide, 2-8 parts by weight of inhibitor, 1-9 parts by weight of blocking agent, 2-10 parts by weight of lubricant as claimed in any one of claims 1-5, 3-11 parts by weight of filtrate reducer, 2-10 parts by weight of viscosity reducer and 11-51 parts by weight of weighting agent.
In an exemplary embodiment of yet another aspect of the present invention, the water-based drilling fluid may comprise:
100 parts by weight of water, 5-11 parts by weight of bentonite, 0.2-0.8 part by weight of sodium carbonate, 0.002-0.25 part by weight of sodium hydroxide, 3-7 parts by weight of an inhibitor, 2-8 parts by weight of a blocking agent, 3-9 parts by weight of the lubricant according to any one of claims 1-5, 4-10 parts by weight of a filtrate reducer, 3-8 parts by weight of a viscosity reducer and 13-46 parts by weight of a weighting agent.
In an exemplary embodiment of yet another aspect of the present invention, the bentonite may be a sodium bentonite;
the inhibitor can be at least one of NaCl, KCl, sodium formate and sodium silicate;
the plugging agent can be a nano plugging agent LAT or Fe3O4Or sulfonated asphalt SAS;
in an exemplary embodiment of yet another aspect of the present invention, the fluid loss additive may be at least one of sodium carboxymethyl cellulose CMC, sulfomethyl phenol-formaldehyde resin SMP-1, and polyacrylonitrile HPAN;
the viscosity reducer can be iron-chromium lignosulfonate FCLS or sodium polyacrylate X-A40;
the weighting agent can be at least one of barite powder, limestone powder or iron ore powder.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
(1) the lubricant for the water-based drilling fluid prepared by the invention not only can greatly improve the lubricating property of the drilling fluid (the reduction rate of the lubricating coefficient of the drilling fluid formed by configuration is more than 90%), but also has better high temperature resistance (the lubricating coefficient of the drilling fluid after being aged for 16 hours at 160 ℃ is basically kept unchanged);
(2) the water-based drilling fluid provided by the invention can form a high-quality mud cake, improves the stability of the mud cake, has a good lubricating effect, has good temperature resistance, is particularly suitable for a long horizontal section of shale gas, can reduce the friction between a drill column and rock debris, and improves the drilling construction efficiency.
Detailed Description
Hereinafter, the lubricant for water-based drilling fluid, the preparation method thereof, and the water-based drilling fluid of the present invention will be described in detail with reference to the exemplary embodiments.
In a first exemplary embodiment of the present invention, a lubricant for a water-based drilling fluid is provided, which may include:
70-80 parts of base oil, 2-5 parts of nonionic surfactant, 1-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 10-20 parts of water.
Further, the lubricant may include:
the lubricant comprises, by weight, 72-78 parts of base oil, 3-4.5 parts of nonionic surfactant, 1.5-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 12-18 parts of water.
Wherein the base oil may include at least one of pentaerythritol ester, polyglycol ether, and methyl silicone oil.
The nonionic surfactant may include at least one of SP-80, OP-10, or TW-80. Here, SP-80 is sorbitan monooleate or span 80, OP-10 is dodecylphenol polyoxyethylene ether, TW-80 is polyoxyethylene (20) sorbitan fatty acid ester.
Further, the extreme pressure anti-wear agent can be an aviation lubricating oil extreme pressure anti-wear agent, and the aviation lubricating oil extreme pressure anti-wear agent can comprise at least one of Trimethylphenol Phosphate (TPC), alpha-Mercaptobenzothiazole (MST) and triphenyl thiophosphate (TPPT or T309).
The pour point depressant is an alkyl naphthalene pour point depressant, and the alkyl naphthalene can comprise at least one of methyl naphthalene, ethyl naphthalene and propyl naphthalene.
In a second exemplary embodiment of the present invention, a method of preparing a lubricant for a water-based drilling fluid is provided, which may include the steps of:
adding 70-80 parts by weight of base oil into a reaction vessel, adding 2-5 parts by weight of nonionic surfactant while stirring, and continuously stirring for 20-30 minutes to uniformly mix the base oil and the nonionic surfactant. Here, the reaction vessel may be a reaction vessel with a stirring function.
Continuously adding 1-3 parts of extreme pressure antiwear agent into the reaction container, and stirring for 10-20 minutes; and 2-3 parts of pour point depressant alkyl naphthalene is added and stirred for 20-30 minutes. The addition of the extreme pressure antiwear agent and the addition of the pour point depressant are not in sequence, and one of the extreme pressure antiwear agent and the pour point depressant can be added firstly or the two can be added simultaneously. And adding 10-20 parts of water with the temperature of 30-40 ℃ into the reaction container, and continuously stirring for 20-30 minutes to obtain the lubricant for the water-based drilling fluid.
In the present exemplary embodiment, the stirring speed of the reaction vessel may be 800 to 1200r/min, for example, 1000 r/min. The temperature in the reaction vessel may be 30 to 40 ℃, for example, 35 ℃.
In a third exemplary embodiment of the present invention, there is provided a water-based drilling fluid that may include:
100 parts by weight of water, 3-12 parts by weight of bentonite, 0.1-1.1 parts by weight of sodium carbonate, 0.001-0.3 parts by weight of sodium hydroxide, 2-8 parts by weight of inhibitor, 1-9 parts by weight of blocking agent, 2-10 parts by weight of lubricant as claimed in any one of claims 1-5, 3-11 parts by weight of filtrate reducer, 2-10 parts by weight of viscosity reducer and 11-51 parts by weight of weighting agent.
Further, the water-based drilling fluid may comprise:
100 parts by weight of water, 5-11 parts by weight of bentonite, 0.2-0.8 part by weight of sodium carbonate, 0.002-0.25 part by weight of sodium hydroxide, 3-7 parts by weight of an inhibitor, 2-8 parts by weight of a blocking agent, 3-9 parts by weight of the lubricant according to any one of claims 1-5, 4-10 parts by weight of a filtrate reducer, 3-8 parts by weight of a viscosity reducer and 13-46 parts by weight of a weighting agent.
In the present exemplary embodiment, the bentonite may be sodium bentonite;
the inhibitor can be at least one of NaCl, KCl, sodium formate and sodium silicate; the plugging agent can be a nano plugging agent LAT or Fe3O4Or sulfonated asphalt SAS. Of course, LAT or Fe may be used as the blocking agent3O4Or sulfonated asphalt SAS may be used together with any two or three.
In the present exemplary embodiment, the fluid loss additive may be at least one of sodium carboxymethyl cellulose CMC, sulfomethyl phenolic SMP-1, and polyacrylonitrile HPAN.
The viscosity reducer can be iron-chromium lignosulfonate FCLS or sodium polyacrylate X-A40.
The weighting agent can be at least one of barite powder, limestone powder or iron ore powder.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
The chemical materials in this example are chemically pure unless otherwise specified. Wherein the synthetic base oil and the alkylnaphthalene are purchased from Shanghai Daoko chemical Co., Ltd; the nonionic surfactant is purchased from Haian petrochemical plants in Jiangsu province; extreme pressure antiwear agents for aviation lubricating oils were purchased from the chemical technology ltd, ruisheng, guangzhou.
Preparation of the lubricant for the water-based drilling fluid:
adding 70g of pentaerythritol ester into a reaction kettle with a stirrer, sequentially adding 2g of nonionic surfactant SP-80 under the stirring condition, and stirring for 25 minutes at 35 ℃ and the rotating speed of 1000 r/min; then 1g of triphenyl thiophosphate (TPPT or T309) as an extreme pressure antiwear agent of the aviation lubricating oil is added into the reaction kettle, and 2g of pour point depressant methylnaphthalene is added after the mixture is stirred for 15 minutes; stirring for 25 minutes, adding 10g of deionized water heated to 35 ℃, and continuing stirring for 25 minutes to obtain the lubricant for the shale gas horizontal well water-based drilling fluid.
Preparing the water-based drilling fluid:
560g of sodium bentonite and 28g of sodium carbonate are added into 7L of water, stirring is carried out for 50min at a high speed of 10000r/min, the stirring process is stopped twice, the sodium bentonite attached to the inner part of a slurry cup is scraped by a glass rod, and after the stirring is finished, sealing and maintaining are carried out for 24h at normal temperature to form base slurry.
Under the condition of stirring at 10000r/min, 200g of KCl, 300g of sulfomethyl phenolic resin SMP-1 and 400g of micro-nano plugging agent Fe are sequentially added into the base slurry3O450g of iron-chromium lignosulfonate FCLS, 1800g of barite powder and 50g of the lubricant for the water-based drilling fluid prepared in the previous step are continuously stirred for 40min, and meanwhile, the pH value of the lubricant is adjusted to 11 by using sodium hydroxide, so that the drilling fluid of the embodiment is obtained.
According to the preparation method, the addition amount of the raw materials of the lubricant is changed to prepare lubricants 1-4 for different shale gas horizontal wells, and the lubricants 1-4 are used to form drilling fluids 1-4. While varying the amounts of lubricant materials so that the amount of at least one material added in the lubricant does not form control samples 5, 6 and drilling fluids 5, 6 within the scope of the present invention. The amounts of each substance added are shown in table 1 below.
TABLE 1 addition of lubricants 1-4 and comparative samples 5 and 6
Lubricity test
And testing the lubricating performance of the drilling fluid 1-6 according to the method specified in the standard Q/SH 1170060-2014. Here, the lubrication performance is characterized by a lubrication coefficient reduction rate. The effect of the invention is illustrated by testing the lubricating coefficient of the drilling fluid and the lubricating coefficient of the drilling fluid after aging for 16h at 160 ℃, in the testing process, the bentonite content of the base slurry is 6%, and the testing instrument is an EP extreme pressure lubrication instrument. The specific test results are shown in table 2.
Table 2 test results of lubrication coefficient reduction rates before and after 1-6 aging of drilling fluid
As can be seen from Table 2, the lubricant for the water-based drilling fluid has a good lubricating effect, and the reduction rate of the lubricating coefficient of the drilling fluids 1-4 prepared from the lubricant samples 1-4 is greater than 90%. The lubricating coefficient reduction rate before and after aging is not greatly different, which indicates that the lubricating oil has better high temperature resistance. It is known from samples 1 and 2 that the addition of an extreme pressure antiwear agent to an aircraft lubricating oil to a lubricant can significantly improve the lubricating effect of the lubricant.
In summary, the beneficial effects of the invention can include at least one of the following:
(1) the lubricant for the water-based drilling fluid prepared by the invention not only can greatly improve the lubricating property of the drilling fluid (the reduction rate of the lubricating coefficient of the drilling fluid formed by configuration is more than 90%), but also has better high temperature resistance (the lubricating coefficient of the drilling fluid after being aged for 16 hours at 160 ℃ is basically kept unchanged);
(2) the water-based drilling fluid provided by the invention can form a high-quality mud cake, improves the stability of the mud cake, has a good lubricating effect, has good temperature resistance, is particularly suitable for a long horizontal section of shale gas, can reduce the friction between a drill column and rock debris, and improves the drilling construction efficiency.
While the present invention has been described above in connection with exemplary embodiments, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. A lubricant for a water-based drilling fluid, the lubricant comprising:
70-80 parts of base oil, 2-5 parts of nonionic surfactant, 1-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 10-20 parts of water.
2. The lubricant for water-based drilling fluids according to claim 1, wherein the lubricant comprises:
the lubricant comprises, by weight, 72-78 parts of base oil, 3-4.5 parts of nonionic surfactant, 1.5-3 parts of extreme pressure antiwear agent, 2-3 parts of pour point depressant and 12-18 parts of water.
3. The lubricant for water-based drilling fluids according to claim 1 or 2, wherein the base oil comprises at least one of pentaerythritol ester, polyglycol ether and methyl silicone oil;
the nonionic surfactant comprises at least one of SP-80, OP-10 or TW-80.
4. The lubricant for the water-based drilling fluid according to claim 1 or 2, wherein the extreme pressure antiwear agent comprises at least one of trimethylphenol phosphate, α -mercaptobenzothiazole, and triphenyl thiophosphate;
the pour point depressant is alkyl naphthalene, and the alkyl naphthalene comprises at least one of methyl naphthalene, ethyl naphthalene and propyl naphthalene.
5. A preparation method of a lubricant for water-based drilling fluid is characterized by comprising the following steps:
adding 70-80 parts by weight of base oil into a reaction container, stirring, adding 2-5 parts by weight of nonionic surfactant, and stirring for 20-30 minutes;
continuously adding 1-3 parts of extreme pressure antiwear agent into the reaction container, and stirring for 10-20 minutes; adding 2-3 parts of pour point depressant, and stirring for 20-30 minutes;
and continuously adding 10-20 parts of water, and stirring for 20-30 minutes to obtain the lubricant for the water-based drilling fluid.
6. The preparation method of the lubricant for the water-based drilling fluid, according to claim 5, is characterized in that the rotation speed of stirring is 800-1200 r/min, and the temperature in the reaction vessel is 30-40 ℃.
7. A water-based drilling fluid, comprising:
100 parts by weight of water, 3-12 parts by weight of bentonite, 0.1-1.1 parts by weight of sodium carbonate, 0.001-0.3 parts by weight of sodium hydroxide, 2-8 parts by weight of inhibitor, 1-9 parts by weight of blocking agent, 2-10 parts by weight of lubricant as claimed in any one of claims 1-5, 3-11 parts by weight of filtrate reducer, 2-10 parts by weight of viscosity reducer and 11-51 parts by weight of weighting agent.
8. The water-based drilling fluid of claim 7, wherein the water-based drilling fluid comprises: 100 parts by weight of water, 5-11 parts by weight of bentonite, 0.2-0.8 part by weight of sodium carbonate, 0.002-0.25 part by weight of sodium hydroxide, 3-7 parts by weight of an inhibitor, 2-8 parts by weight of a blocking agent, 3-9 parts by weight of the lubricant according to any one of claims 1-5, 4-10 parts by weight of a filtrate reducer, 3-8 parts by weight of a viscosity reducer and 13-46 parts by weight of a weighting agent.
9. The water-based drilling fluid according to claim 7 or 8, wherein the bentonite is sodium bentonite;
the inhibitor is at least one of NaCl, KCl, sodium formate and sodium silicate;
the plugging agent is a nano plugging agent LAT or Fe3O4Or sulfonated asphalt SAS.
10. The water-based drilling fluid according to claim 7 or 8, wherein the fluid loss additive is at least one of sodium carboxymethyl cellulose CMC, sulfomethyl phenol-formaldehyde resin SMP-1 and polyacrylonitrile HPAN;
the viscosity reducer is iron-chromium lignosulfonate FCLS or sodium polyacrylate X-A40;
the weighting agent is at least one of barite powder, limestone powder or iron ore powder.
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