CN114752365A - Polyacrylate grafted graphene oxide plugging agent and oil-based drilling fluid - Google Patents
Polyacrylate grafted graphene oxide plugging agent and oil-based drilling fluid Download PDFInfo
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Abstract
The invention discloses a polyacrylate grafted graphene oxide plugging agent and an oil-based drilling fluid. The blocking agent used by the oil-based drilling fluid is polyacrylate grafted graphene oxide, and the synthetic raw materials of the polyacrylate grafted graphene oxide blocking agent comprise graphene oxide, an aminosilane compound, an acrylate compound and an acrylamide compound. The drilling fluid comprises the polyacrylate grafted graphene oxide plugging agent. The polyacrylate grafted graphene oxide is used as a blocking agent, the particle size of the blocking agent is approximately distributed between 60 nm and 1200nm, and the nano-pore gaps in the shale stratum can be effectively blocked, so that the well wall can be effectively stabilized, and collapse can be prevented; the plugging agent has small influence on the performance of the drilling fluid, is beneficial to reducing the filtration loss of the drilling fluid, and has good performances in rheological property, water loss wall building property, plugging property and the like under the condition of shale formation.
Description
Technical Field
The invention relates to the technical field of oil and gas field drilling, in particular to a polyacrylate grafted graphene oxide plugging agent and an oil-based drilling fluid.
Background
The drilling fluid filtrate is easy to enter the stratum through tiny pores under the action of pressure difference in the drilling process, and the transmission action of hydraulic pressure in the tiny cracks causes crack induction and development, so that the stability of the well wall is poor, and drilling accidents such as well wall collapse and the like can be caused in severe cases.
The instability of the well wall is an urgent and unsolved major engineering problem which puzzles the well drilling field for many years. Borehole wall instability can cause a series of downhole complex conditions such as leakage, jetting, collapse, clamping, inclination and the like. Further, the drilling period is prolonged, the drilling cost is increased, the drilling speed is reduced, and the economic benefit of oil-gas exploration and development is seriously influenced. According to statistics, the borehole wall instability of the deep stratum accounts for about 35% of the treatment aging of complex drilling conditions, and more than 90% of the borehole wall instability occurs in a shale stratum, wherein the brittle shale stratum accounts for about 2/3. The stability of the well wall is the key for ensuring the efficient development of petroleum energy, and the strengthening of the plugging of the nano-pore gap is one of the key measures for solving the instability of the well wall. The common plugging agent for drilling fluid has large particle size, so that the nano-pore gaps in shale strata are difficult to be effectively plugged, and therefore, the nano-scale plugging agent needs to be used for plugging. The currently commonly used drilling fluid nano plugging agents are mainly divided into organic nano plugging agents, inorganic nano plugging agents and organic/inorganic nano plugging agents. The existing inorganic nano plugging agent is easy to agglomerate in the using process, so that particles are increased rapidly. The organic/inorganic nano blocking agent causes the prepared particles to lose the nano size due to the hybridization process in the preparation process. Therefore, the synthesis of a plugging agent with a nanometer size is a good choice for plugging the shale nanometer cracks.
The Metal Organic Frameworks (MOFs) have the advantages of high specific surface area, large porosity, good thermal stability and the like, and are materials with great application prospects. Graphene Oxide (GO) is a product obtained after graphite oxide is oxidized, although graphene oxide is similar to graphene, a large number of oxygen-containing functional groups, such as Carboxyl (COOH), hydroxyl (OH) and epoxy (C-O-C), are distributed in graphene oxide, and when the oxygen-containing functional groups are added into a hydrophobic polymer membrane, the defect of hydrophobicity can be effectively overcome. The metal organic framework is combined with the graphene oxide, so that the metal organic framework has a very potential to be used as a blocking agent with good performance to be applied to the drilling fluid.
The existing oil-based drilling fluid has many defects, and particularly in the aspect of plugging nano-scale cracks, the plugging effect needs to be further improved. Therefore, the development of a novel nano plugging oil-based drilling fluid applicable to shale formations is a key technology of shale gas drilling at present and is also a difficult point of shale drilling at home and abroad.
Disclosure of Invention
Aiming at the problem of borehole wall instability caused by the fact that the conventional plugging agent cannot effectively plug the nano-pore gaps in the shale at present, the invention provides the polyacrylate grafted graphene oxide plugging agent, the particle size of the plugging agent can reach the nano level, and the nano-pore gaps in the shale stratum can be effectively plugged, so that the aim of stabilizing the borehole wall is fulfilled.
In order to realize the purpose, the technical scheme of the invention is as follows: the synthesis of the polyacrylate grafted graphene oxide blocking agent comprises the following raw materials of graphene oxide, an aminosilane compound, an acrylate compound and an acrylamide compound, wherein the preparation steps of the polyacrylate grafted graphene oxide blocking agent are as follows:
(1) preparation of aminated graphene oxide:
dispersing graphene oxide in absolute ethyl alcohol, ultrasonically stirring for 30-40min, slowly adding an ethanol solution containing an aminosilane compound, stirring and reacting for 12-16h at the temperature of 30-50 ℃, placing the product in n-hexane for precipitation after stirring, centrifuging for 10-12min at the speed of 6000-8000rpm, washing the product with acetone, and finally drying for 24-30h at the temperature of 60-80 ℃ to obtain a product A;
(2) Addition reaction of aminated graphene oxide and acrylate compounds:
dispersing the product A in methanol, ultrasonically stirring for 30-40min, then transferring to a reactor, slowly adding methanol solution containing acrylate compounds under the protection of nitrogen at the temperature of 0-2 ℃, placing the reactor in the dark, stirring for 3-4 days at the temperature of 20-30 ℃, washing the product with ethanol after stirring is finished, placing the product in n-hexane for precipitation, and finally drying at the temperature of 60-80 ℃ for 24-30h to obtain a product B;
(3) preparing a polyacrylate grafted graphene oxide plugging agent:
dispersing the product B in methanol, ultrasonically stirring for 30-40min, slowly adding a methanol solution containing amine compounds, continuously stirring and reacting for 48-56h under the protection of nitrogen and at the temperature of 0-2 ℃ under the dark condition, then washing the product with ethanol, centrifuging for 10-12min at the speed of 6000 plus of 8000rpm, and finally drying for 24-30h at the temperature of 60-80 ℃ to obtain the polyacrylate grafted graphene oxide plugging agent;
the ratio of the graphene oxide to the absolute ethyl alcohol is 1 g: 180-220 ml;
the ratio of the graphene oxide to the aminosilane compound ethanol solution is 1 g: 60-80 ml;
The volume ratio of the aminosilane compound to the ethanol in the aminosilane compound-containing ethanol solution is 1: 12-16;
the ratio of the product A to methanol was 1 g: 12-16 ml;
the ratio of the product A to the methanol solution containing the acrylate compound is 1 g: 10-15 ml;
the volume ratio of the acrylate compound to the methanol in the methanol solution containing the acrylate compound is 1: 4-6;
the ratio of the product B to methanol was 1 g: 80-120 ml;
the ratio of the product B to the methanol solution containing the amine compound is 1 g: 80-120 ml;
the volume ratio of the amine compound to the methanol in the methanol solution containing the amine compound is 1: 6-10;
the aminosilane compound is one of (3-aminopropyl) trimethoxysilane, 3-aminopropyl triethoxysilane, 3-aminopropyl dimethoxy methylsilane, M-aminophenyl trimethoxysilane, 3- (diethoxymethyl silyl) propylamine, 3-aminopropyl bis (trimethylsiloxy) methylsilane, 3-aminopropyl dimethylmethoxysilane and 3- (dimethylethoxysilyl) n-propane;
the acrylic ester compound is one of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate;
The acrylamide compound is one of acrylamide, N-hydroxymethyl acrylamide, N-hydroxyethyl acrylamide, N-isopropyl acrylamide, N-benzyl acrylamide, N-tert-butyl acrylamide, N-dimethyl methacrylamide and 2-methyl acrylamide.
The invention also aims to provide an oil-based drilling fluid, which is added with the polyacrylate grafted graphene oxide plugging agent.
The drilling fluid comprises the following components: 70-90 parts of white oil, 0.5-1 part of main emulsifier, 1-3 parts of auxiliary emulsifier, 2-10 parts of fluid loss additive, 2-5 parts of organic soil, 0.6-6.5 parts of quicklime and 10-30 parts of CaCl with the concentration of 20-25%2The sealing agent comprises saline water, 0.5-2.1 parts of wetting agent, 10-40 parts of barite and 1-10 parts of polyacrylate grafted graphene oxide sealing agent.
The white oil in the oil-based drilling fluid is 3# white oil, the primary emulsifier is one of OME, WO-NT, HIEMUL and HW Pmul-1, and the secondary emulsifier is one of OME-2, HICOAT and HW Smul-1The wetting agent is HW Wet-1, the fluid loss additive is one of oxidized asphalt, YJ-2 and HWTrol-101, the organic soil is HW Gel-3, and the density of barite is 4.1g/cm 3。
The pH of the oil-based drilling fluid is 8.0-11.5.
The density of the oil-based drilling fluid is 1.65g/cm when the plugging agent is not added with the polyacrylate grafted graphene oxide3。
The invention has the following beneficial effects:
the particle size distribution of the polyacrylate grafted graphene oxide plugging agent prepared by the invention is 60-1200nm, and compared with the traditional oil-based drilling fluid plugging agent, the plugging agent belongs to a nano-scale plugging material, can plug smaller nano cracks, and has good compatibility with the oil-based drilling fluid. The plugging agent can plug cracks with different porosities at high temperature, and effectively reduces the seepage filtration loss and the filtration rate. In addition, the oil-based drilling fluid used by the invention has good performances in rheological property, plugging property and the like under the condition of shale formation.
Drawings
FIG. 1 is a graph showing the particle size distribution of the polyacrylate grafted graphene oxide plugging agent in the first example;
FIG. 2 is a graph showing the distribution of the particle size of the polyacrylate grafted graphene oxide plugging agent in example II;
fig. 3 is a particle size distribution diagram of the polyacrylate grafted graphene oxide blocking agent in example three.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the examples, the parts are parts by weight unless otherwise specified.
Synthesis of polyacrylate grafted graphene oxide plugging agent
Example 1:
weighing 1g of graphene oxide, dispersing the graphene oxide in 180mL of absolute ethanol, ultrasonically stirring for 30min, slowly adding 80mL of (3-aminopropyl) trimethoxysilane ethanol solution, stirring and reacting at 35 ℃ for 13h, placing a product in n-hexane for precipitation after stirring is finished, centrifuging at 6000rpm for 10min, washing the product with acetone, and finally drying at 60 ℃ for 25h to obtain a product A;
weighing 1g of product A, dispersing the product A in 12mL of methanol solution, ultrasonically stirring for 30min, then transferring to a reactor, slowly adding 12mL of methyl acrylate methanol solution at the temperature of 0 ℃ under the protection of nitrogen, placing the reactor in the dark, stirring for 3 days at the temperature of 25 ℃, washing the product with ethanol after stirring is finished, placing the product in n-hexane for precipitation, and finally drying at the temperature of 60 ℃ for 25h to obtain a product B;
thirdly, weighing 1g of the product B, dispersing the product B in a methanol solution, ultrasonically stirring for 30min, slowly adding 80mL of acrylamide methanol solution, continuously stirring and reacting for 48h under the conditions of nitrogen protection and 0 ℃ and darkness, then washing the product with ethanol, centrifuging for 10min at the speed of 6000rpm, and finally drying for 25h at the temperature of 60 ℃ to obtain the polyacrylate grafted graphene oxide plugging agent No. 1.
Example 2:
weighing 1g of graphene oxide, dispersing the graphene oxide in 190mL of absolute ethanol, ultrasonically stirring for 35min, slowly adding 80mL of (3-aminopropyl) trimethoxysilane ethanol solution, stirring and reacting for 13h at 40 ℃, placing a product in n-hexane for precipitation after stirring is finished, centrifuging for 10min at 8000rpm, washing the product with acetone, and finally drying for 25h at 60 ℃ to obtain a product A;
weighing 1g of product A, dispersing the product A in 12mL of methanol solution, ultrasonically stirring for 35min, then transferring to a reactor, slowly adding 12mL of ethyl methacrylate methanol solution at the temperature of 1 ℃ under the protection of nitrogen, placing the reactor in the dark, stirring for 3 days at the temperature of 30 ℃, washing the product with ethanol after stirring is finished, placing the product in n-hexane for precipitation, and finally drying at the temperature of 60 ℃ for 25h to obtain a product B;
thirdly, weighing 1g of product B, dispersing the product B in a methanol solution, ultrasonically stirring for 35min, slowly adding 80 mLN-isopropyl acrylamide methanol solution, continuously stirring and reacting for 48h under the conditions of nitrogen protection and 1 ℃ and darkness, then washing the product with ethanol, centrifuging for 10min at the speed of 8000rpm, and finally drying for 25h at the temperature of 60 ℃ to obtain the polyacrylate grafted graphene oxide plugging agent No. 2.
Example 3:
weighing 1g of graphene oxide, dispersing the graphene oxide in 190mL of absolute ethanol, ultrasonically stirring for 35min, slowly adding 80mL of 3-aminopropyltriethoxysilane ethanol solution, stirring for reacting for 13h at 40 ℃, placing a product in n-hexane for precipitation after stirring is finished, centrifuging for 12min at the speed of 7000rpm, washing the product with acetone, and finally drying for 28h at the temperature of 70 ℃ to obtain a product A;
weighing 1g of product A, dispersing the product A in 14mL of methanol solution, ultrasonically stirring for 35min, then transferring to a reactor, slowly adding 14mL of ethyl acrylate methanol solution at the temperature of 2 ℃ under the protection of nitrogen, placing the reactor in the dark, stirring for 3 days at the temperature of 30 ℃, washing the product with ethanol after stirring is finished, placing the product in n-hexane for precipitation, and finally drying at the temperature of 70 ℃ for 28h to obtain a product B;
thirdly, weighing 1g of product B, dispersing the product B in a methanol solution, ultrasonically stirring for 35min, slowly adding 80 mLN-tert-butyl acrylamide methanol solution, continuously stirring and reacting for 48h under the conditions of nitrogen protection and 2 ℃ and darkness, then washing the product with ethanol, centrifuging for 12min at the speed of 7000rpm, and finally drying for 28h at the temperature of 70 ℃ to obtain the polyacrylate grafted graphene oxide plugging agent No. 3.
Secondly, preparing the oil-based drilling fluid:
directly weighing 1.80g of main emulsifier HW Pmul-1, 4.50g of auxiliary emulsifier HW Smul-1 and 2.40g of wetting agent HW Wet-1 in a high-stirring cup; measuring 240mL of 3# white oil, introducing the white oil into a high-stirring cup, placing the high-stirring cup on a high-stirring machine, stirring at a high speed of 12000rpm, and stirring for 10 min; weighing 9g of organic soil HW Gel-3 by using glassine, slowly adding the organic soil HW Gel-3 into a high-stirring cup under a high-stirring state, preventing splashing, and performing high-stirring for 10 min; under the condition of high stirring, 60mL of CaCl with the concentration of 25% is measured. Adding the water solution into a high stirring cup to prevent splashing, and performing high stirring for 10 min; slowly adding 9g of calcined lime HW-pH into a high stirring cup under a high stirring state, and performing high stirring for 10 min; slowly adding 24g of the fluid loss agent HW Trol-101 into a high stirring cup under a high stirring cup state, and stirring for 10 min; slowly adding the calculated polyacrylate grafted graphene oxide plugging agent (with different mass fractions) into a high-stirring cup under a high-stirring state, stirring for 10min, and taking off the high-stirring cup to scrape the wall; under high stirring, 295g of barite was slowly added to the high stirring cup, stirring was continued for 30min, during which time the high stirring cup was removed and the wall was scraped again.
In order to further illustrate the effects of the polyacrylate grafted graphene oxide plugging agent and the oil-based drilling fluid, the polyacrylate grafted graphene oxide plugging agent and the oil-based drilling fluid prepared in examples 1, 2 and 3 were subjected to performance tests.
Third, performance test
1. Polyacrylate grafted graphene oxide plugging agent particle size test
Particle size tests were performed on the polyacrylate grafted graphene oxide blocking agent using a BI-200SM laser scattering instrument manufactured by brueck hein instruments, and the results of the particle size tests on the polyacrylate grafted graphene oxide blocking agent prepared in 3 examples are shown in fig. 1, fig. 2, and fig. 3, respectively. The particle size of the polyacrylate grafted graphene oxide plugging agent is nano-micron, is approximately distributed between 60 nm and 1200nm, has high matching degree with the nano-micron level crack size in the shale, and can be used for effectively plugging the shale.
2. Plugging experiment of artificial rock core
The method comprises the steps of simulating a nano-micron fracture stratum of a stratum by using an artificial rock core, measuring the average flow of a drilling fluid system in the artificial rock core, and calculating the permeability K of the artificial rock core which is equal to Q [ mu ] l/(A [ delta ] P) before and after adding the polyacrylate grafted graphene oxide plugging agent according to a Darcy formula, so that the plugging rate of the polyacrylate grafted graphene oxide plugging agent on the artificial rock core is calculated, and the test result is shown in table 1.
Table 1 artificial core plugging performance test data
According to the above table, when the amount of the added polyacrylate grafted graphene oxide blocking agent is 1%, the permeability of the mud cake in examples 1-3 is respectively reduced by 79.24%, 78.48% and 78.73%, the blocking effect is better with the increase of the amount of the polyacrylate grafted graphene oxide blocking agent, and when the amount of the added polyacrylate grafted graphene oxide blocking agent is 3%, the effect is optimal, the blocking rates are respectively 94.68%, 94.43% and 94.68%, and when the amount of the added polyacrylate grafted graphene oxide blocking agent exceeds 3%, the permeability of the mud cake is reduced hardly obviously. The polyacrylate grafted graphene oxide plugging agent has a good effect on low permeability, and the optimal addition amount of the polyacrylate grafted graphene oxide plugging agent is 3%.
3. Oil-based drilling fluid performance testing
The polyacrylate grafted graphene oxide blocking agent in the embodiments 1, 2 and 3 is added into the prepared oil-based drilling fluid, and the oil-based drilling fluid is hot-rolled for 16 hours at 150 ℃, so that the rheological property is measured, and the result is shown in table 2. In order to further embody the performance of the oil-based drilling fluid provided by the invention, the polyacrylate grafted graphene oxide plugging agent is replaced by a common plugging material MB-1 (a rigid plugging material mainly containing barium sulfate) to prepare the oil-based drilling fluid for comparison, and then the comparative example is placed under the same conditions for the drilling fluid performance test, and the results are shown in Table 2.
TABLE 2 oil-based drilling fluid Performance parameters
Note: the HTHP had a temperature of 150 ℃ and a pressure of 3.5 MPa.
According to the table, the oil-based drilling fluid prepared by using the polyacrylate grafted graphene oxide prepared in the examples 1, 2 and 3 as a blocking agent has excellent drilling fluid rheological properties, and both the viscosity and the shear force can meet the requirements of on-site drilling. With the increase of the addition of the polyacrylate grafted graphene oxide plugging agent, the viscosity of the oil-based drilling fluid is increased, but the change amplitude is small, and the shear force is kept stable, so that the plugging agent and the oil-based drilling fluid have good compatibility; the filter loss of the drilling fluid is reduced along with the increase of the addition of the plugging agent, and excellent plugging performance is shown. In addition, compared with the performance of the oil-based drilling fluid using the rigid plugging material MB-1 as a plugging agent, the performance of the oil-based drilling fluid of all the embodiments is lower in API and high-temperature and high-pressure filtration loss, so that the drilling fluid prepared by the polyacrylate grafted graphene oxide plugging agent synthesized by the invention has better performance.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (6)
1. The polyacrylate grafted graphene oxide plugging agent and the oil-based drilling fluid are characterized in that the raw materials of the polyacrylate grafted graphene oxide plugging agent are graphene oxide, an aminosilane compound, an acrylate compound and an acrylamide compound, and are prepared by the following steps:
(1) preparing aminated graphene oxide:
dispersing graphene oxide in absolute ethyl alcohol, ultrasonically stirring for 30-40min, slowly adding an ethanol solution containing an aminosilane compound, stirring and reacting for 12-16h at the temperature of 30-50 ℃, after stirring, putting a product into n-hexane for precipitation, centrifuging for 10-12min at the speed of 6000 rpm, washing the product with acetone, and finally drying at the temperature of 60-80 ℃ for 24-30h to obtain a product A;
(2) Addition reaction of aminated graphene oxide and acrylate compounds:
dispersing the product A in methanol, ultrasonically stirring for 30-40min, then transferring to a reactor, slowly adding methanol solution containing acrylate compounds under the protection of nitrogen at the temperature of 0-2 ℃, placing the reactor in the dark, stirring for 3-4 days at the temperature of 20-30 ℃, washing the product with ethanol after stirring is finished, placing the product in n-hexane for precipitation, and finally drying at the temperature of 60-80 ℃ for 24-30h to obtain a product B;
(3) preparing a polyacrylate grafted graphene oxide plugging agent:
dispersing the product B in methanol, ultrasonically stirring for 30-40min, slowly adding a methanol solution containing an acrylamide compound, continuously stirring and reacting for 48-56h under the protection of nitrogen and at the temperature of 0-2 ℃ under the dark condition, then washing the product with ethanol, centrifuging for 10-12min at the speed of 6000 plus of 8000rpm, and finally drying for 24-30h at the temperature of 60-80 ℃ to obtain the polyacrylate grafted graphene oxide plugging agent;
in the step (1), the ratio of the graphene oxide to the absolute ethyl alcohol is 1 g: 180-220 ml, wherein the proportion of the graphene oxide to the aminosilane compound ethanol solution is 1 g: 60-80 ml; the volume ratio of the aminosilane compound to the ethanol in the aminosilane compound-containing ethanol solution is 1: 12-16;
In the step (2), the ratio of the product A to methanol is 1 g: 12-16 ml, wherein the ratio of the product A to a methanol solution containing acrylate compounds is 1 g: 10-15 ml, wherein the volume ratio of the acrylate compound to the methanol in the methanol solution containing the acrylate compound is 1: 4-6;
in the step (3), the ratio of the product B to methanol is 1 g: 80-120 ml, wherein the ratio of the product B to the methanol solution containing the acrylamide compound is 1 g: 80-120 ml, wherein the volume ratio of the amine compound to the methanol in the methanol solution containing the acrylamide compound is 1: 6 to 10.
2. The polyacrylate grafted graphene oxide blocking agent according to claim 1, wherein the aminosilane compound is one of (3-aminopropyl) trimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyldimethoxymethylsilane, M-aminophenyltrimethoxysilane, 3- (diethoxymethylsilyl) propylamine, 3-aminopropylbis (trimethylsiloxy) methylsilane, 3-aminopropyldimethylmethoxysilane, 3- (dimethylethoxysilyl) n-propane; the acrylic ester compound is one of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate; the acrylamide compound is one of acrylamide, N-hydroxymethyl acrylamide, N-hydroxyethyl acrylamide, N-isopropyl acrylamide, N-benzyl acrylamide, N-tert-butyl acrylamide, N-dimethyl methacrylamide and 2-methyl acrylamide.
3. An oil-based drilling fluid, which contains the polyacrylate grafted graphene oxide plugging agent of claim 1, and comprises the following components in parts by weight: 70-90 parts of white oil, 0.5-1 part of main emulsifier, 1-3 parts of auxiliary emulsifier, 2-10 parts of fluid loss additive, 2-5 parts of organic soil, 0.6-6.5 parts of quicklime and 10-30 parts of CaCl with the concentration of 20-25%2The sealing agent comprises saline water, 0.5-2.1 parts of wetting agent, 10-40 parts of barite and 1-10 parts of polyacrylate grafted graphene oxide sealing agent.
4. The oil-based drilling fluid of claim 3, whereinThe white oil is 3# white oil, the main emulsifier is one of OME, HIEMUL and HW Pmul-1, the auxiliary emulsifier is one of OME-2, HICOAT and HW Smul-1, the wetting agent is HWWet-1, the fluid loss additive is one of oxidized asphalt and HWTrol-101, the organic soil is HW Gel-3, and the density of barite is 4.1g/cm3。
5. The oil-base drilling fluid of claim 3, wherein the pH of said oil-base drilling fluid is from 8.0 to 11.5.
6. The oil-based drilling fluid of claim 3, wherein the oil-based drilling fluid has a density of 1.20 to 2.10g/cm without addition of a polyacrylate grafted graphene oxide blocking agent 3。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115386349A (en) * | 2022-09-19 | 2022-11-25 | 成都汇能恒源科技有限公司 | Plugging type fluid loss additive for oil-based drilling fluid and preparation method thereof |
| CN116042196A (en) * | 2022-10-26 | 2023-05-02 | 四川康荣石油化工科技有限公司 | Modified graphite plugging agent with temperature resistance and oil resistance and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113355061A (en) * | 2021-06-22 | 2021-09-07 | 西南石油大学 | External flexible internal rigid type oil-based drilling fluid nano plugging agent and oil-based drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113355061A (en) * | 2021-06-22 | 2021-09-07 | 西南石油大学 | External flexible internal rigid type oil-based drilling fluid nano plugging agent and oil-based drilling fluid |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386349A (en) * | 2022-09-19 | 2022-11-25 | 成都汇能恒源科技有限公司 | Plugging type fluid loss additive for oil-based drilling fluid and preparation method thereof |
| CN116042196A (en) * | 2022-10-26 | 2023-05-02 | 四川康荣石油化工科技有限公司 | Modified graphite plugging agent with temperature resistance and oil resistance and application thereof |
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