CN115558477B - Water-based drilling fluid for oversized displacement well - Google Patents

Water-based drilling fluid for oversized displacement well Download PDF

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CN115558477B
CN115558477B CN202211107763.7A CN202211107763A CN115558477B CN 115558477 B CN115558477 B CN 115558477B CN 202211107763 A CN202211107763 A CN 202211107763A CN 115558477 B CN115558477 B CN 115558477B
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drilling fluid
parts
based drilling
regulator
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CN115558477A (en
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由福昌
许明标
可点
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Jingzhou Jiahua Technology Co ltd
Yangtze University
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Jingzhou Jiahua Technology Co ltd
Yangtze University
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    • 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
    • C09K8/06—Clay-free compositions
    • C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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    • C08G73/024—Polyamines containing oxygen in the form of ether bonds in the main chain
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1092—Polysuccinimides
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/06—Clay-free compositions
    • C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/34—Lubricant additives

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Abstract

The invention provides a water-based drilling fluid for an oversized-displacement well, and relates to the technical field of oilfield chemistry in petroleum drilling engineering. The ultra-large displacement well water-based drilling fluid disclosed by the invention has the following ageing effects of different densities and different temperatures: the rheological property is good, the dynamic-plastic ratio and the reading of 6-rotation and 3-rotation are large, the clear rock carrying sand of an oversized displacement well is facilitated, and the generation of a rock debris bed in a horizontal section is prevented; the method has the characteristics of API filtration loss and low high-temperature high-pressure water loss, has higher rolling recovery rate and stronger inhibition, and is favorable for keeping the stability of the well wall in the operation process; the extreme pressure lubrication coefficient and the average friction coefficient are equivalent to those of oil base, and the wear resistance is superior to that of oil base drilling fluid, so that the ultra-large displacement water base drilling fluid has good friction torque reducing performance, and can reduce conditions such as torque holding, drilling sticking and the like.

Description

Water-based drilling fluid for oversized displacement well
Technical Field
The invention relates to the technical field of oilfield chemistry in petroleum drilling engineering, in particular to water-based drilling fluid.
Background
The ultra-large displacement well with a horizontal section length (namely an operation well with a water-to-vertical ratio of more than 2 or a horizontal displacement distance of more than 2000 m) can furthest increase the contact area between a borehole and a reservoir, greatly increase the single well yield of an oil-gas well, reduce the oil-gas exploitation cost, and is widely applied to oil-gas resource exploration and development of a plurality of oil fields at home and abroad at present, and has become one of important technical means for efficiently developing unconventional oil-gas reservoirs such as tight gas hypotonic oil reservoirs, shale gas oil reservoirs and offshore marginal oil reservoirs. The oil-based drilling fluid has excellent lubricating, inhibiting and anti-pollution properties, has strong rheological property regulating and controlling capability, can effectively reduce friction torque in the drilling process, reduce the invasion of oily filtrate to stratum rock and ensure the lubricating and anti-blocking capability and the well wall stability of an operation well in the application process of an oversized displacement well. However, the use of oil-based drilling fluids is increasingly limited due to the increasing environmental requirements, as well as the low drilling costs and ease of handling in the field.
The water-based drilling fluid has low cost, simple waste treatment process of drill cuttings and the like, and relatively small toxic and side effects on the environment, and can effectively overcome the defects of the oil-based drilling fluid. However, the current water-based drilling fluid is applied to oversized displacement wells, and has the problems of insufficient lubricity and inhibition and poor borehole cleaning condition. Therefore, the water-based drilling fluid for the ultra-large displacement well is researched to improve the lubrication, drag reduction and torsion reduction performance of the water-based drilling fluid, optimize the rheological property of the water-based drilling fluid and improve the system inhibition performance.
The invention patent with the authority of CN103952128B discloses a weak gel solid-free water-based drilling fluid suitable for large-displacement wells and horizontal wells, and the drilling fluid formula provided by the scheme comprises the following components: according to 100 percent by weight, 0.5 to 1 percent of coating agent, 0.5 to 1 percent of flow pattern regulator, 2 to 6 percent of filtrate reducer, 0.5 to 1 percent of inhibitor, 1 to 6 percent of lubricant, 0.2 to 1 percent of alkaline pH regulator, 0.2 to 0.5 percent of corrosion inhibitor, 5 to 40 percent of salt and the balance of water. The weak gel solid-free crystal drilling fluid has high viscosity at low shear rate, good temperature resistance, and strong inhibition and lubricity. However, the system is only suitable for large-displacement wells under the low-density condition, and has large high-temperature high-pressure filtration loss, which is not beneficial to the well wall stability of the operation well.
The invention patent with the application number of CN202110906457.9 discloses a low-friction water-based drilling fluid, which comprises the following preparation raw materials in parts by weight: water: 75-90 parts; aqueous polyphosphate solution: 10-25 parts of a lubricant; alkalinity regulator: 0.1 to 2.0 parts; filtrate reducer: 1.0 to 4.0 parts; rheology modifier: 0.1 to 0.6 part; anti-collapse plugging agent: 1.0 to 3.5 portions; inhibitors: 1.0 to 3.5 portions; barite: 0-100 parts. The low-friction water-based drilling fluid is not added with oily or water-based lubricant, but takes the polyphosphate aqueous solution with super-strong lubricity as the base fluid, so that the lubricating performance comparable with that of the oil-based drilling fluid is realized. However, the low-friction water-based drilling fluid is only oil-based drilling fluid with lubricating and wear-resisting properties, well wall stability of the drilling fluid closely related to the horizontal extension distance of the ultra-large displacement well is affected, and performances such as sand carrying of clear rock and the like are not evaluated.
The invention patent with the application number of CN107955589A discloses a cellulose nanofiber and a clay-free phase water-based drilling fluid containing the cellulose nanofiber, wherein the content of the cellulose nanofiber is 1-30 g based on the volume of 1L water; the content of the filtrate reducer is 20-40 g; the content of shale inhibitor is 10-30 g; the content of the high-temperature stabilizer is 1-10 g; the content of the lubricant is 20-30 g; the content of the weighting material in each liter of clay-free phase water-based drilling fluid is 100-2000 g. The solution has good and stable rheological property under the conditions before and after aging at the high temperature of 180 ℃, the dynamic plastic ratio reaches more than 0.5, the drilling fluid has strong shearing dilutability and thixotropic property, has the characteristic of 'quick weak gel', and is beneficial to improving the drilling fluid rock carrying efficiency in the drilling process of a large-displacement well and a horizontal well. However, the lubricating drag reduction and collapse prevention performances of the water-based drilling fluid are not evaluated, and whether the water-based drilling fluid can be suitable for operation of an oversized displacement well cannot be determined.
In summary, although a great number of water-based drilling fluids with high lubrication, strong inhibition, strong plugging and high efficiency of well cleaning are reported in the currently published patent and scientific paper, most of water-based drilling fluids cannot simultaneously meet the problems of lubrication and anti-seizing, well cleaning and well wall stabilization of oversized displacement wells.
Disclosure of Invention
The invention aims to provide water-based drilling fluid which can simultaneously solve the problems of lubrication and anti-seizing, borehole cleaning and borehole wall stabilization of an oversized displacement well and realize safe and efficient operation of the water-based drilling fluid on the oversized displacement well.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a water-based drilling fluid, which comprises a water-based fluid and the following components in percentage by mass:
alkaline pH regulator: 0.2 to 1 percent;
filtrate reducer: 1 to 2 percent;
coating agent: 0.5 to 1 percent;
weighting agent: 0-100%;
flow pattern regulator: 0.2 to 1 percent;
polyamine inhibitors: 1 to 2 percent;
multifunctional lubricating drag reducer: 10-20%;
the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride;
the multifunctional lubricating drag reducer comprises, by mass, 200 parts of modified polyaspartic acid 60-70 parts, polyol phosphate 30-40 parts and water 100 parts;
the preparation of the modified polyaspartic acid comprises the following steps: mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propylene diamine, performing ring opening polymerization at 70-80 ℃, cooling to 25-35 ℃, adding a second sodium hydroxide solution into the obtained product system, and performing hydrolysis to obtain the modified polyaspartic acid.
Preferably, the water-based liquid is fresh water or sea water.
Preferably, the alkaline pH adjustor is one or more of sodium hydroxide, sodium carbonate, potassium hydroxide and magnesium hydroxide.
Preferably, the alkaline pH regulator comprises 30-40 parts of sodium hydroxide, 30-40 parts of sodium carbonate and 20-40 parts of magnesium hydroxide by mass of 100 parts.
Preferably, the filtrate reducer is one or more of carboxymethyl starch, hydroxyethyl starch, sodium carboxymethyl cellulose and polyanionic cellulose.
Preferably, the coating agent is one or two of a zwitterionic polymer coating agent and partially hydrolyzed polyacrylamide.
Preferably, the flow-pattern modifier is one or more of xanthan gum, guar gum, konjak powder, sesbania powder and sand sagebrush gum.
Preferably, the molar ratio of the diethylene glycol di (3-aminopropyl) ether to the maleic anhydride is (1-10): (1-10).
Preferably, the weighting agent is a heavy stone.
Preferably, the time of the ring-opening polymerization is 3 to 5 hours.
The invention provides a water-based drilling fluid, which comprises a water-based fluid and the following components in percentage by mass: alkaline pH regulator: 0.2 to 1 percent; filtrate reducer: 1 to 2 percent; coating agent: 0.5 to 1 percent; weighting agent: 0-100%; flow pattern regulator: 0.2 to 1 percent; polyamine inhibitors: 1 to 2 percent; multifunctional lubricating drag reducer: 10-20%; the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride; the multifunctional lubricating drag reducer comprises, by mass, 200 parts of modified polyaspartic acid 60-70 parts, polyol phosphate 30-40 parts and water 100 parts; the preparation of the modified polyaspartic acid comprises the following steps: mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propylene diamine, performing ring opening polymerization at 70-80 ℃, cooling to 25-35 ℃, adding a second sodium hydroxide solution into the obtained product system, and performing hydrolysis to obtain the modified polyaspartic acid.
The multifunctional lubricating drag reducer is formed by compounding modified polyaspartic acid and polyol phosphate, has low biotoxicity and excellent lubricating performance, has certain plugging performance and inhibiting function, can reduce the addition of a system inhibitor and a plugging agent, and reduces the field application and maintenance difficulty of drilling fluid; specific: the polyaspartic acid has strong water solubility, no toxicity, no public hazard and strong biodegradability, and lone pair electrons on N, O atoms in the polymer product molecules can be combined with Fe and other orbits to form a complex to be adsorbed on the metal surface, so that a layer of compact adsorption film is formed to play a role in extreme pressure lubrication; the amide group, carboxyl group, amino group and the like of the modified polyaspartic acid can also form a nonpolar oil film on the surface of clay, so that the inhibition performance of a drilling fluid system is improved; the macromolecular chains of the polymer can be stretched in water to form a space reticular structure, thereby playing an auxiliary plugging role; the modified polyaspartic acid increases the water solubility and the molecular weight of the polyaspartic acid, improves the lubrication, inhibition and blocking effects of the polyaspartic acid, and further improves the extreme pressure lubrication wear resistance of the multifunctional lubrication drag reducer by compounding the polyaspartic acid with polyol phosphate.
The flow pattern regulator, polyamine inhibitor and lubricating drag reducer cooperate to ensure that the water-based drilling fluid has better rheological property, inhibition property and wear resistance and drag reduction property, and can solve the problems of high cleaning difficulty of the well bore of the oversized displacement well, high requirement on stability of the well wall, high friction torque and the like.
In addition, the water-based drilling fluid has wider density which is up to 1.5g/cm by adjusting the adding amount of the weighting agent 3 Meanwhile, the degradation of each component is not obvious at high temperature, the application range of the temperature is wide, and the application temperature is up to 150 ℃.
Drawings
FIG. 1 is a wear scar chart of example 1;
FIG. 2 is a wear scar chart of example 2;
FIG. 3 is a wear scar chart of example 3;
FIG. 4 is a wear scar chart of example 4;
FIG. 5 is a wear scar chart of example 5;
FIG. 6 is a wear scar chart of example 6;
FIG. 7 is a wear scar chart of example 7;
FIG. 8 is a wear scar chart of example 8;
FIG. 9 is a wear scar plot of comparative example 1;
FIG. 10 is a wear scar plot of comparative example 2;
FIG. 11 is a wear scar chart of comparative example 3.
Detailed Description
The invention provides a water-based drilling fluid, which comprises a water-based fluid and the following components in percentage by mass:
alkaline pH regulator: 0.2 to 1 percent;
filtrate reducer: 1 to 2 percent;
coating agent: 0.5 to 1 percent;
weighting agent: 0-100%;
flow pattern regulator: 0.2 to 1 percent;
polyamine inhibitors: 1 to 2 percent;
multifunctional lubricating drag reducer: 10-20%;
the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride;
the multifunctional lubricating drag reducer comprises, by mass, 200 parts of modified polyaspartic acid 60-70 parts, polyol phosphate 30-40 parts and water 100 parts;
the preparation of the modified polyaspartic acid comprises the following steps: mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propylene diamine, performing ring opening polymerization at 70-80 ℃, cooling to 25-35 ℃, adding a second sodium hydroxide solution into the obtained product system, and performing hydrolysis to obtain the modified polyaspartic acid.
In the present invention, the raw materials used are commercially available products well known in the art, unless specifically described otherwise.
The water-based drilling fluid provided by the invention comprises water-based fluid. In the present invention, the water-based liquid is preferably fresh water or sea water.
Based on the mass of the water-based liquid, the water-based drilling liquid provided by the invention comprises 0.2-1% of alkaline pH regulator, preferably 0.3-0.8%, and more preferably 0.4-0.6% of water-based liquid. In the present invention, the alkaline pH adjuster is one or more of sodium hydroxide, sodium carbonate, potassium hydroxide and magnesium hydroxide, more preferably sodium hydroxide, sodium carbonate and magnesium hydroxide. The alkaline pH regulator preferably comprises 30-40 parts of sodium hydroxide, 30-40 parts of sodium carbonate and 20-40 parts of magnesium hydroxide by mass per 100 parts of alkaline pH regulator. In the invention, the sodium hydroxide and sodium carbonate buffer can provide a relatively stable alkaline condition for the system, and the magnesium hydroxide can still maintain a relatively good alkaline environment under a high temperature condition, so that the alkalinity of the system is prevented from falling too fast under the high temperature condition, and the stability of the drilling fluid material is prevented from being influenced.
The water-based drilling fluid provided by the invention comprises 1-2% of filtrate reducer, preferably 1.2-1.8%, more preferably 1.4-1.6% of water-based fluid. In the present invention, the fluid loss additive is preferably one or more of carboxymethyl starch, hydroxyethyl starch, sodium carboxymethyl cellulose and polyanionic cellulose, more preferably carboxymethyl starch and polyanionic cellulose. The mass of the filtrate reducer is 100 parts, and the filtrate reducer preferably comprises 45 parts of carboxymethyl starch and 55 parts of polyanionic cellulose. According to the invention, the filtrate reducer can reduce the filtrate loss of drilling fluid and improve the quality of mud cakes.
The water-based drilling fluid provided by the invention comprises 0.5-1% of coating agent, preferably 0.6-0.9%, more preferably 0.7-0.8% of water-based fluid. In the present invention, the coating agent is preferably one or both of a zwitterionic polymer-based coating agent and a partially hydrolyzed polyacrylamide. The invention has no special requirements on specific types of the zwitterionic polymer coating agent, and can be FA367 or VISPLUS; the invention has no special requirements on the specific type of the partially hydrolyzed polyacrylamide, and the specific type of the partially hydrolyzed polyacrylamide can be PF-PLUS, PF-PLH and JH-PLUS. In the invention, the coating agent has the functions of improving the rheological parameter of drilling fluid, improving the shearing and diluting capacity, reducing the filtration loss and coating drill cuttings.
The water-based drilling fluid provided by the invention comprises 0-100% of weighting agent. The amount of weighting agent added can be adjusted by one skilled in the art according to the density requirements. In the present invention, the weighting agent is preferably barite; the particle size of the barite is preferably 200 to 1000 mesh, more preferably 300 to 800 mesh, and still more preferably 500 to 600 mesh.
The water-based drilling fluid provided by the invention comprises 0.2-1% of flow pattern regulator, preferably 0.3-0.9%, more preferably 0.4-0.8% of water-based fluid. In the present invention, the flow pattern modifier is preferably one or more of xanthan gum, guar gum, konjak powder, sesbania powder and sand sagebrush gum; when the flow pattern regulator is a plurality of substances, the invention has no special requirement on the mixture ratio of the substances, and the mixture ratio can be any. In the invention, the flow pattern regulator has the functions of regulating the rheological property of drilling fluid and improving the dynamic-plastic ratio.
The water-based drilling fluid provided by the invention comprises 1-2% of polyamine inhibitor, preferably 1.2-1.8%, more preferably 1.4-1.6% of water-based fluid. In the invention, the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride; the molar ratio of diethylene glycol bis (3-aminopropyl) ether to maleic anhydride is preferably (1 to 10): (1 to 10), more preferably (1 to 10): (3-7); the polymerization temperature is preferably 125-135 ℃ and the time is preferably 3-5 h. The preparation method of the polyamine inhibitor is not particularly required, and the preparation method well known in the art can be adopted. In the present invention, the method for preparing the polyamine inhibitor preferably comprises the steps of: firstly, diethylene glycol di (3-aminopropyl) ether is added into a four-neck round-bottom flask, the four-neck round-bottom flask is placed in a constant temperature oil bath pot, stirring is started, and nitrogen is introduced to remove oxygen; after the temperature is raised to 60 ℃, maleic anhydride is slowly added, and the temperature in the flask is controlled not to exceed 65 ℃ by controlling the adding speed; after the charging is completed, nitrogen is introduced again, the flask mouth is closed, and the temperature is kept for 30min; slowly raising the temperature to 125-135 ℃, maintaining the reaction temperature of 125-135 ℃ for polymerization for 3-5 h, and naturally cooling to normal temperature to obtain the polyamine inhibitor.
The polyamine inhibitor can improve the inhibition performance of drilling fluid and prevent the hydration of shale stratum.
The water-based drilling fluid provided by the invention comprises 10-20% of multifunctional lubricating drag reducer, preferably 12-18%, more preferably 14-16% of the water-based fluid. In the invention, the mass of the multifunctional lubricating drag reducer is 200 parts, and the multifunctional lubricating drag reducer comprises 60-70 parts of modified polyaspartic acid, 30-40 parts of polyol phosphate and 100 parts of water.
In the present invention, the preparation of the modified polyaspartic acid preferably comprises the steps of: mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propylene diamine, performing ring opening polymerization at 70-80 ℃, cooling to 25-35 ℃, adding a second sodium hydroxide solution into the obtained product system, and performing hydrolysis to obtain the modified polyaspartic acid.
In the invention, the water is preferably deionized water, and the mass ratio of the water to the polysuccinimide powder is preferably 100 (10-20); the mass concentration of the first sodium hydroxide solution is preferably 5%; the mass ratio of the first sodium hydroxide solution to the N, N-dimethyl-1, 3-propanediamine is preferably (10-15): (5-8); the mass ratio of the polysuccinimide powder to the N, N-dimethyl-1, 3-propanediamine is preferably (10-20): (5-8). In the present invention, the first sodium hydroxide solution functions to provide an alkaline environment.
In the present invention, mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propanediamine preferably comprises: mixing water and polysuccinimide powder to obtain suspension; dissolving N, N-dimethyl-1, 3-propylene diamine into a first sodium hydroxide solution to obtain a solution; heating the solution to 70-80 ℃, and adding the suspension into the obtained solution.
In the present invention, the time of the ring-opening polymerization is preferably 3 to 5 hours.
In the ring-opening polymerization process, the polysuccinimide is subjected to ring opening and then polymerized with N, N-dimethyl-1, 3-propanediamine.
After the ring-opening polymerization is completed, the temperature is reduced to 25-35 ℃, and a second sodium hydroxide solution is added into the obtained product system for hydrolysis.
In the present invention, the mass concentration of the second sodium hydroxide solution is preferably 20%; the mass ratio of the second sodium hydroxide solution to the polysuccinimide powder is preferably (10-20): (10-20). In the present invention, the second sodium hydroxide solution functions to promote hydrolysis. In the present invention, the hydrolysis is preferably performed under stirring, and the time of the hydrolysis is preferably 0.5 to 1 hour.
After the hydrolysis is completed, the invention preferably further comprises the steps of naturally cooling a hydrolysate system to normal temperature, adding hydrochloric acid to neutralize to neutrality, dripping the hydrolysate system into absolute ethyl alcohol, stirring to separate out precipitate, washing the obtained precipitate with acetone, and drying to obtain the modified polyaspartic acid.
The polyaspartic acid has strong water solubility, no toxicity, no public hazard and strong biodegradability, and lone pair electrons on N, O atoms in the polymer product molecules can be combined with Fe and other orbits to form a complex to be adsorbed on the metal surface, so that a layer of compact adsorption film is formed to play a role in extreme pressure lubrication; amide groups, carboxyl groups, amino groups and the like can also form nonpolar oil films on the surfaces of clay, so that the inhibition performance of a drilling fluid system is improved; the macromolecular chains of the polymer can be stretched in water to form a space reticular structure, thereby playing an auxiliary plugging role; the modified polyaspartic acid increases the water solubility and the molecular weight of the polyaspartic acid, improves the lubrication, inhibition and blocking effects of the polyaspartic acid, and further improves the extreme pressure lubrication wear resistance of the multifunctional lubrication drag reducer by compounding the polyaspartic acid with polyol phosphate.
The preparation method of the water-based drilling fluid has no special requirements, and the water-based drilling fluid is uniformly mixed by adopting a conventional preparation method.
The water-based drilling fluids provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the invention.
Example 1
An oversized-displacement-well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a flow pattern regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.5%;
filtrate reducer: 1.0%;
coating agent: 0.6%;
weighting agent: 0;
flow pattern regulator: 0.4%;
polyamine inhibitors: 1.2%;
multifunctional lubricating drag reducer: 15%;
the water is fresh water;
wherein the alkaline pH regulator comprises 40 parts of sodium hydroxide, 40 parts of sodium carbonate and 20 parts of magnesium hydroxide by 100 parts by weight;
the filtrate reducer comprises 50 parts by weight of carboxymethyl starch (CMS) and 50 parts by weight of polyanionic cellulose (PAC) based on 100 parts by weight;
the coating agent is partially hydrolyzed polyacrylamide;
the flow-type modifier comprises 50 parts of xanthan gum and 50 parts of guar gum based on 100 parts by weight;
the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride;
the preparation steps of the polyamine inhibitor are as follows:
firstly, 50 parts of diethylene glycol di (3-aminopropyl) ether is added into a four-neck round-bottom flask, the four-neck round-bottom flask is placed in a constant temperature oil bath, stirring is started, and nitrogen is introduced to remove oxygen; after the temperature is raised to 60 ℃, 25 parts of maleic anhydride is slowly added, and the temperature in the flask is controlled not to exceed 65 ℃ by controlling the adding speed; after the charging is completed, nitrogen is introduced into the flask again, the flask mouth is closed, and the temperature is kept for 30min; after slowly raising the temperature to 130 ℃, maintaining the reaction temperature at 130 ℃ for 4 hours. And then naturally cooling to normal temperature to obtain the polyamine inhibitor.
The multifunctional lubricating drag reducer comprises, by weight, 200 parts of water, 60 parts of modified polyaspartic acid and 40 parts of polyol phosphate;
the preparation method of the modified polyaspartic acid comprises the following steps:
firstly, adding 100 parts of deionized water and 15 parts of polysuccinimide powder into a four-necked round bottom flask, and uniformly stirring to enable the powder to be uniformly suspended; 10 parts of NaOH solution with the concentration of 5% and 6 parts of N, N-dimethyl-1, 3-propylene diamine are added into the other three-neck flask, and uniformly stirred and dissolved; heating the four-neck flask to 75 ℃ in a water bath, and slowly adding liquid in the three-neck flask; after the charging is completed, preserving heat and reacting for 4 hours; cooling to 25 ℃, adding 15 parts of 20% NaOH solution into the reacted solution, stirring for 1h to hydrolyze, naturally cooling the obtained hydrolysate system to normal temperature, adding hydrochloric acid to neutralize to neutral, slowly dripping into absolute ethyl alcohol, and washing the obtained precipitate with acetone to obtain a dried solid product, namely the modified polyaspartic acid.
The density of the water-based drilling fluid system is 1.05g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Example 2
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.5%;
filtrate reducer: 1.2%;
coating agent: 0.6%;
weighting agent: 7.5%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.2%;
multifunctional lubricating drag reducer: 15%;
the water is sea water;
wherein the alkaline pH regulator comprises 40 parts of sodium hydroxide, 40 parts of sodium carbonate and 20 parts of magnesium hydroxide by 100 parts by weight;
the filtrate reducer comprises 45 parts of carboxymethyl starch (CMS) and 55 parts of polyanionic cellulose (PAC) by 100 parts by weight;
the coating agent is partially hydrolyzed polyacrylamide;
the weighting agent is 500-mesh commercial barite;
the flow-type modifier comprises 60 parts of xanthan gum and 40 parts of guar gum based on 100 parts by weight;
the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride; the preparation steps of the polyamine inhibitor are as follows:
firstly, 50 parts of diethylene glycol di (3-aminopropyl) ether is added into a four-neck round-bottom flask, the four-neck round-bottom flask is placed in a constant temperature oil bath, stirring is started, and nitrogen is introduced to remove oxygen; after the temperature is raised to 60 ℃, 25 parts of maleic anhydride is slowly added, and the temperature in the flask is controlled not to exceed 65 ℃ by controlling the adding speed; after the charging is completed, nitrogen is introduced into the flask again, the flask mouth is closed, and the temperature is kept for 30min; after slowly raising the temperature to 140 ℃, maintaining the reaction temperature at 140 ℃ for 3 hours. And then naturally cooling to normal temperature to obtain the polyamine inhibitor.
The multifunctional lubricating drag reducer comprises, by weight, 200 parts of water, 70 parts of modified polyaspartic acid and 30 parts of polyol phosphate;
the preparation method of the modified polyaspartic acid comprises the following steps:
firstly, adding 100 parts of deionized water and 20 parts of polysuccinimide powder into a four-necked round bottom flask, and uniformly stirring to enable the powder to be uniformly suspended; adding 12 parts of NaOH solution with the concentration of 5% and 8 parts of N, N-dimethyl-1, 3-propylene diamine into the other three-neck flask, and uniformly stirring and dissolving; heating the four-neck flask to 80 ℃ in a water bath mode, and then slowly adding liquid in the three-neck flask; after the charging is completed, preserving heat and reacting for 3 hours; cooling to 35 ℃, adding 16 parts of NaOH solution with the concentration of 20% into the reacted solution, stirring for 0.5h for hydrolysis, naturally cooling the obtained hydrolysate system to normal temperature, adding hydrochloric acid for neutralization to neutrality, slowly dripping into absolute ethyl alcohol, and washing the obtained precipitate with acetone and drying to obtain the solid product, namely the modified polyaspartic acid.
The density of the water-based drilling fluid system is 1.10g/cm 3 The hot rolling temperature of the drilling fluid system is 130 DEG C
Example 3
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.4%;
multifunctional lubricating drag reducer: 15%;
the water is sea water;
the specific kinds of the components are the same as in example 2;
the density of the water-based drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Example 4
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.4%;
multifunctional lubricating drag reducer: 10%;
the water is sea water;
the specific kinds of the components are the same as in example 2;
the density of the water-based drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Example 5
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.4%;
multifunctional lubricating drag reducer: 20% of a base;
the water is sea water;
the specific kinds of the components are the same as in example 2;
the density of the water-based drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Example 6
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 75%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.4%;
multifunctional lubricating drag reducer: 15%;
the water is sea water;
wherein the alkaline pH regulator comprises 40 parts of sodium hydroxide, 40 parts of sodium carbonate and 20 parts of magnesium hydroxide by 100 parts by weight;
the filtrate reducer comprises 40 parts of carboxymethyl starch (CMS) and 60 parts of polyanionic cellulose (PAC) based on 100 parts by weight;
the coating agent is partially hydrolyzed polyacrylamide;
the weighting agent is 500-mesh commercial barite;
the flow-type modifier comprises 60 parts of xanthan gum and 40 parts of guar gum based on 100 parts by weight;
the polyamine inhibitor used in this example was prepared in the same manner as in example 2;
the multifunctional lubricating drag reducer is formed by compounding modified polyaspartic acid and polyol phosphate;
the multifunctional lubricating drag reducer comprises, by weight, 200 parts of water, 70 parts of modified polyaspartic acid and 30 parts of polyol phosphate;
the modified polyaspartic acid used in this example was prepared in the same manner as in example 2.
The density of the drilling fluid system is 1.50g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Example 7
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.5%;
filtrate reducer: 1.2%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.2%;
multifunctional lubricating drag reducer: 15%;
the water is sea water;
wherein the alkaline pH regulator comprises 40 parts of sodium hydroxide, 40 parts of sodium carbonate and 20 parts of magnesium hydroxide by 100 parts by weight;
the filtrate reducer comprises 45 parts of carboxymethyl starch (CMS) and 55 parts of polyanionic cellulose (PAC) by 100 parts by weight;
the coating agent is partially hydrolyzed polyacrylamide;
the weighting agent is 500-mesh commercial barite;
the flow-type modifier comprises 60 parts of xanthan gum and 40 parts of guar gum based on 100 parts by weight;
the polyamine inhibitor used in this example was prepared in the same manner as in example 2.
The multifunctional lubricating drag reducer comprises, by weight, 200 parts of water, preferably 100 parts of modified polyaspartic acid, 70 parts of polyol phosphate and 30 parts of modified polyaspartic acid;
the modified polyaspartic acid used in this example was prepared in the same manner as in example 2.
The density of the drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 110 ℃.
Example 8
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator, a polyamine inhibitor and a multifunctional lubricating drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.8%;
filtrate reducer: 1.6%;
coating agent: 1.0%;
weighting agent: 36%;
flow pattern regulator: 0.6%;
polyamine inhibitors: 1.5%;
multifunctional lubricating drag reducer: 15%;
the water is sea water;
wherein the alkaline pH regulator comprises 30 parts of sodium hydroxide, 30 parts of sodium carbonate and 40 parts of magnesium hydroxide by 100 parts by weight;
the fluid loss additive comprises 30 parts by weight of carboxymethyl starch (CMS) and 70 parts by weight of polyanionic cellulose (PAC) based on 100 parts by weight.
The coating agent is partially hydrolyzed polyacrylamide;
the weighting agent is 500-mesh commercial barite;
the flow-type modifier comprises 80 parts of xanthan gum and 20 parts of guar gum based on 100 parts by weight;
the polyamine inhibitor used in this example was prepared in the same manner as in example 2;
the multifunctional lubricating drag reducer comprises, by weight, 200 parts of water, 70 parts of modified polyaspartic acid and 30 parts of polyol phosphate;
the modified polyaspartic acid used in this example was prepared in the same manner as in example 2;
the density of the drilling fluid system is 1.3g/cm 3 The hot rolling temperature of the drilling fluid system is 150 ℃.
Comparative example 1
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator and a multifunctional lubrication drag reducer;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 0
Multifunctional lubricating drag reducer: 15%;
the water is sea water;
the kinds of the respective components are the same as in example 2;
the density of the drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Comparative example 2
An ultra-large displacement well water-based drilling fluid comprises water, an alkaline pH regulator, a filtrate reducer, a coating agent, a weighting agent, a flow-type regulator and a polyamine inhibitor;
the weight percentage of each component in water is as follows:
water: 100;
alkaline pH regulator: 0.6%;
filtrate reducer: 1.4%;
coating agent: 0.8%;
weighting agent: 36%;
flow pattern regulator: 0.5%;
polyamine inhibitors: 1.4%;
multifunctional lubricating drag reducer: 0
The water is sea water;
the specific kinds of the respective components were the same as in example 2.
The density of the drilling fluid system is 1.30g/cm 3 The hot rolling temperature of the drilling fluid system is 130 ℃.
Comparative example 3
Oil-based drilling fluid: 75 parts of 3# white oil, 25 parts of 25% calcium chloride aqueous solution, 4.0 parts of main emulsifier JHEMUL, 1.0 parts of auxiliary emulsifier JHCOAT, 1.0 parts of cutting agent JHHERO, 2.0 parts of alkalinity regulator CaO, 2.0 parts of organic soil JHMOGEL, 3.0 parts of filtrate reducer JHFLO, 3.0 parts of plugging agent JHSEAL and 48 parts of barite are fully mixed to obtain the oil-based drilling fluid. The density of the drilling fluid system is 1.3g/cm 3 The hot rolling temperature of the drilling fluid system is 130 DEG C
Part 1 of the field test of drilling fluids for oil and gas industry according to GB/T16783.1-2012: water-based drilling fluids and GB/T16783.2-2012 drilling fluid field test part 2: the oil-based drilling fluid was evaluated for rheological properties, fluid loss properties, and the like of examples 1 to 8 and comparative examples 1 to 3, and the experimental results are shown in table 1.
The friction coefficients of examples 1-8 and comparative examples 1-3 were tested according to Q/SYTZ 0022-2015 technical requirements for liquid Lubricants for drilling fluids and FANN extreme pressure Lubricants used indoors in the experimental method under 150 inch-lbs of effort, and the experimental results are shown in Table 1;
the steel ball abrasion mark diameters of examples 1 to 8 and comparative examples 1 to 3 under 147N load and 60min conditions are shown in FIGS. 1 to 11, and the average friction coefficients are shown in Table 1, according to GB/T3142-2019 four ball method for determination of bearing capacity of Lubricant in a room using a micro-controlled fully automatic four ball friction tester of SGW-10W of Jinan Hengxu tester technology Co., ltd. The grinding mark diameters in FIGS. 1 to 11 are 0.662mm, 0.714mm, 0.780mm, 0.793mm, 0.606mm, 0.744mm, 0.751mm, 0.753mm, 0.827mm, 1.441mm and 0.738mm in order; the smaller the diameter of the steel ball grinding mark is, the better the abrasion resistance of the drilling fluid system is; the smaller the average friction coefficient, the better the lubricating performance of the drilling fluid system.
The rolling recovery rates of the shale of examples 1 to 8 and comparative examples 1 to 3 were measured according to SY/T5613-2016 drilling fluid test method for physical and chemical properties of shale, and the results are shown in Table 1.
Table 1 base properties of drilling fluids for examples and comparative examples
Figure BDA0003842062820000171
Figure BDA0003842062820000181
Examples 1, 2, 3 and 6 compare the performance of drilling fluids at the same temperature and different densities, and as can be seen from examples 1, 2, 3 and 6, the ultra-large displacement water-based drilling fluid system is 1.50g/cm 3 The parameters such as rheological property, filtration property, lubricating property, inhibition property and the like are better and stable; examples 3, 7 and 8 are used for comparing the performances of drilling fluids at the same density and different temperatures, and as can be seen from examples 3, 7 and 8, the ultra-large displacement water-based drilling fluid system has better rheological property, fluid loss property, lubricating property, inhibition property and other parameters below 150 ℃, and keeps stable; as can be seen from example 3 and comparative examples 1 and 2, the system has no addition of the amine inhibitor, the viscosity and shear strength are increased remarkably, the high-temperature high-pressure fluid loss is increased, the rolling recovery rate is reduced, the system is not added with the multifunctional lubricant, the rheological property and the inhibition property are reduced, the reduction of the lubrication drag reduction performance is obvious, and the multifunctional lubrication drag reduction agent has good lubrication drag reduction performance and a certain inhibition effect; from example 3 and comparative example 3, the extreme pressure lubrication coefficient, average friction coefficient and steel ball abrasion mark diameter of the system are equivalent to those of the oil-based system, which shows that the lubricating and abrasion resistance of the ultra-large displacement water-based drilling fluid system is comparable to that of the oil-based system.
To sum up, eight groups of embodiments of the ultra-large displacement well water-based drilling fluids of the present invention, after aging at different densities and different temperatures: the rheological property is good, the dynamic-plastic ratio and the reading of 6-rotation and 3-rotation are large, the clear rock carrying sand of an oversized displacement well is facilitated, and the generation of a rock debris bed in a horizontal section is prevented; the method has the characteristics of API filtration loss and low high-temperature high-pressure water loss, has higher rolling recovery rate and stronger inhibition, and is favorable for keeping the stability of the well wall in the operation process; the extreme pressure lubrication coefficient and the average friction coefficient are equivalent to those of oil base, and the wear resistance is superior to that of oil base drilling fluid, so that the ultra-large displacement water base drilling fluid has good friction torque reducing performance, and can reduce conditions such as torque holding, drilling sticking and the like.
Note that:
t: aging temperature of drilling fluid, and the temperature is lower than the temperature;
ρ: density of drilling fluid, g/cm 3 ；
AV: apparent viscosity of drilling fluid, mPa.s;
PV: plastic viscosity of drilling fluid, mPa.s;
YP: drilling fluid cutting force Pa;
Φ6: a six-speed rotary viscometer reads at 6 turns, and has no dimension;
Φ3: a six-speed rotary viscometer reads 3 revolutions, and has no dimension;
API: drilling fluid medium-pressure water loss (0.7 MPa, T,30 min), mL;
HTHP: drilling fluid is dehydrated at high temperature and high pressure (3.5 MPa, T,30 min) and mL;
EP: extreme pressure lubrication coefficient, dimensionless;
AVG: average friction coefficient, dimensionless;
and GD: rolling recovery,%.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The water-based drilling fluid is characterized by comprising water-based fluid and the following components in percentage by mass:
alkaline pH regulator: 0.2 to 1 percent;
filtrate reducer: 1 to 2 percent;
coating agent: 0.5 to 1 percent;
weighting agent: 0-100%;
flow pattern regulator: 0.2 to 1 percent;
polyamine inhibitors: 1 to 2 percent;
multifunctional lubricating drag reducer: 10-20%;
the polyamine inhibitor is an amino polymer obtained by polymerizing diethylene glycol di (3-aminopropyl) ether and maleic anhydride;
the multifunctional lubricating drag reducer comprises, by mass, 200 parts of modified polyaspartic acid 60-70 parts, polyol phosphate 30-40 parts and water 100 parts;
the preparation of the modified polyaspartic acid comprises the following steps: mixing water, polysuccinimide powder, a first sodium hydroxide solution and N, N-dimethyl-1, 3-propylene diamine, performing ring opening polymerization at 70-80 ℃, cooling to 25-35 ℃, adding a second sodium hydroxide solution into the obtained product system, and performing hydrolysis to obtain the modified polyaspartic acid.
2. The water-based drilling fluid of claim 1, wherein the water-based fluid is fresh water or seawater.
3. The water-based drilling fluid of claim 1, wherein the alkaline pH adjuster is one or more of sodium hydroxide, sodium carbonate, potassium hydroxide, and magnesium hydroxide.
4. The water-based drilling fluid according to claim 3, wherein the alkaline pH regulator comprises 30-40 parts of sodium hydroxide, 30-40 parts of sodium carbonate and 20-40 parts of magnesium hydroxide based on 100 parts by mass of the alkaline pH regulator.
5. The water-based drilling fluid of claim 1, wherein the fluid loss additive is one or more of carboxymethyl starch, hydroxyethyl starch, sodium carboxymethyl cellulose, and polyanionic cellulose.
6. The water-based drilling fluid of claim 1, wherein the coating agent is one or both of a zwitterionic polymer-based coating agent and a partially hydrolyzed polyacrylamide.
7. The water-based drilling fluid according to claim 1, wherein the flow pattern modifier is one or more of xanthan gum, guar gum, konjak powder, sesbania powder and sand sagebrush gum.
8. The water-based drilling fluid according to claim 1, wherein the molar ratio of diethylene glycol bis (3-aminopropyl) ether to maleic anhydride is (1-10): (1-10).
9. The water-based drilling fluid of claim 1, wherein the weighting agent is a heavy stone.
10. The water-based drilling fluid according to claim 1, wherein the ring-opening polymerization time is 3 to 5 hours.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101921481A (en) * 2010-07-27 2010-12-22 北京化工大学 Gel prepared by in situ crosslinking hyaluronic acid and polyaspartic acid and preparation method thereof
CN106543436A (en) * 2016-11-01 2017-03-29 石家庄铁道大学 High molecular organic amine and maleic anhydride modified polyaspartic acid salts and its preparation method
CN113429948A (en) * 2021-08-09 2021-09-24 长江大学 Low-friction water-based drilling fluid and preparation method thereof
CN114058341A (en) * 2020-07-29 2022-02-18 中国石油化工股份有限公司 Additive for drilling fluid and composition for drilling fluid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101921481A (en) * 2010-07-27 2010-12-22 北京化工大学 Gel prepared by in situ crosslinking hyaluronic acid and polyaspartic acid and preparation method thereof
CN106543436A (en) * 2016-11-01 2017-03-29 石家庄铁道大学 High molecular organic amine and maleic anhydride modified polyaspartic acid salts and its preparation method
CN114058341A (en) * 2020-07-29 2022-02-18 中国石油化工股份有限公司 Additive for drilling fluid and composition for drilling fluid
CN113429948A (en) * 2021-08-09 2021-09-24 长江大学 Low-friction water-based drilling fluid and preparation method thereof

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