CN114574174B - Rheological modifier for water-based drilling fluid, preparation method of rheological modifier and water-based drilling fluid - Google Patents
Rheological modifier for water-based drilling fluid, preparation method of rheological modifier and water-based drilling fluid Download PDFInfo
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- CN114574174B CN114574174B CN202210138719.6A CN202210138719A CN114574174B CN 114574174 B CN114574174 B CN 114574174B CN 202210138719 A CN202210138719 A CN 202210138719A CN 114574174 B CN114574174 B CN 114574174B
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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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- C09K8/02—Well-drilling compositions
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Abstract
The invention relates to the field of oilfield chemistry, and discloses a rheological modifier for water-based drilling fluid, a preparation method of the rheological modifier and the water-based drilling fluid. The preparation method of the rheological modifier for the water-based drilling fluid comprises the following steps: (1) Carrying out hydrothermal carbonization reaction on the suspension to obtain a reaction product; (2) Centrifuging, drying and crushing the reaction product to obtain the rheological modifier; wherein the suspension comprises: biomass, water, mineral particles, and optionally organic acids and/or catalysts. The water-based drilling fluid comprises the rheological modifier prepared by the method. The rheological modifier provided by the invention has good rheological property adjusting capability at high temperature, and the preparation method is simple and easy to carry out industrial production.
Description
Technical Field
The invention relates to the field of oilfield chemistry, in particular to a rheological modifier for water-based drilling fluid, a preparation method of the rheological modifier and the water-based drilling fluid.
Background
With the development of drilling engineering technology, deep wells, ultra-deep wells and geothermal wells are gradually increased, the formation is more and more complicated to drill, and the formation is more and more frequently drilled at high temperature and high pressure. As a result, the composition of the drilling fluid system becomes complex and maintenance of the drilling fluid system becomes difficult. Maintaining proper rheological properties is essential to ensure safe and effective drilling operations. Under the ultra-high temperature condition, the rheological property of the drilling fluid is deteriorated, which may cause a series of underground complex conditions and even underground accidents.
The tackifiers commonly used at present mainly comprise natural polymers and synthetic polymers. The natural polymer and derivatives such as carboxymethyl cellulose, carboxyethyl cellulose, modified guar gum, xanthan gum and the like and synthetic polymers such as acrylamide polymers and the like form a network connection structure through the mutual bridging action to improve the viscosity of the drilling fluid, and meanwhile, the polar groups of the long-chain polymer tackifier are hydrated and entangled with each other between molecular chains to increase the viscosity of the water phase. However, the modified natural polymer and its derivative tackifier can be oxidized and degraded at above 150 ℃, and the molecular structure of the synthetic polymer tackifier can be degraded and broken at ultrahigh temperature, and the rheological property adjusting capability is lost.
Therefore, it is necessary to develop ultra-high temperature rheology modifiers.
Disclosure of Invention
The invention aims to solve the problem that a rheological modifier for water-based drilling fluid is degraded and ineffective at high temperature in the prior art, and provides a rheological modifier for water-based drilling fluid, a preparation method thereof and water-based drilling fluid, wherein the rheological modifier still has good rheological adjustment capability at high temperature.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing a rheology modifier for water-based drilling fluids, comprising the steps of:
(1) Carrying out hydrothermal carbonization reaction on the suspension to obtain a reaction product;
(2) Centrifuging, drying and crushing the reaction product to obtain the rheological modifier;
wherein the suspension comprises: biomass, water, mineral particles, and optionally organic acids and/or catalysts.
In a second aspect, the present invention provides a rheology modifier for water-based drilling fluids produced by the above method.
In a third aspect the present invention provides a water-based drilling fluid comprising a rheology modifier for a water-based drilling fluid according to the second aspect above.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) Compared with the traditional polymer rheological modifier, the rheological modifier for the water-based drilling fluid provided by the invention is not degraded and destroyed at high temperature, and the rheological property of the drilling fluid before and after the ultrahigh temperature is effectively kept stable.
(2) Compared with the traditional rheological modifier, the rheological modifier for the water-based drilling fluid has excellent tackifying performance at high temperature, can effectively improve the viscosity and the dynamic-plastic ratio of the water-based drilling fluid, has the temperature resistance up to 220 ℃, and has the viscosity retention up to 80%.
(3) Compared with the traditional rheological modifier, the rheological modifier for the water-based drilling fluid provided by the invention has the advantages of wide sources of raw materials, low cost and better environmental protection performance.
(4) The invention has simple process, no toxicity and no dust generation in the whole production process, and is easy for industrial production.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the present invention, the "first", "second" and "third" do not limit the present inventors, but only to distinguish materials at different stages and operations performed.
The first aspect of the invention provides a method for preparing a rheology modifier for a water-based drilling fluid, comprising the steps of:
(1) Carrying out hydrothermal carbonization reaction on the suspension to obtain a reaction product;
(2) Centrifuging, drying and crushing the reaction product to obtain the rheological modifier;
wherein the suspension comprises: biomass, water, mineral particles, and optionally organic acids and/or catalysts.
According to the invention, the rheological modifier for the water-based drilling fluid is prepared by taking mineral particles as templates and carrying out hydrothermal carbonization reaction on biomass with wide sources on the surfaces of the mineral particles. The rheological modifier provided by the invention has the advantages of simple preparation method, wide raw material sources, low cost, good environmental protection performance, no toxicity and no dust generation in the whole production process, and easy industrial production.
The inventor of the present invention found through experiments that water forms vapor pressure in a high-temperature closed environment, and under such an environment, biomass undergoes a hydrothermal carbonization reaction to form carbon microspheres and is adsorbed on the surfaces of mineral particles, and finally, the mineral particle-carbon microsphere nanocomposite is formed. The surface of the nano composite material particle contains a large amount of oxygen-containing functional groups, and a grid structure can be formed by the nano composite material particle and clay particles through electrostatic action, hydrogen bonding action and the like, so that the rheological property of the water-based drilling fluid under the ultra-high temperature condition is improved. Meanwhile, the nanocomposite has excellent high-temperature stability, excellent dispersion performance in water, no thermal degradation and failure like the traditional polymer at high temperature, and can effectively regulate and control rheological property under the ultra-high temperature condition.
In some embodiments of the invention, the suspension is prepared by a preparation method comprising the steps of: biomass, water, mineral particles, and optionally organic acids and/or catalysts are mixed.
The present invention is not particularly limited in the mixing process as long as the mixing uniformity can be ensured. Preferably, the mixing process comprises the steps of:
(a) Firstly mixing biomass with water to obtain a first suspension;
(b) And carrying out second mixing on the first suspension and mineral particles to obtain the suspension.
In some embodiments of the invention, the process of mixing may further comprise the steps of: and carrying out second mixing on the first suspension and mineral particles, and then carrying out third mixing on the first suspension and the mineral particles and the organic acid and/or the catalyst to obtain the suspension.
In some embodiments of the invention, the conditions of the first mixing include: the temperature is 15-40deg.C, preferably 20-35deg.C; the stirring rate is 4000-12000rmp, preferably 8000-10000rmp; the time is 10-60min, preferably 15-60min.
In some embodiments of the invention, the conditions of the second mixing include: the temperature is 15-40deg.C, preferably 20-35deg.C; the stirring rate is 4000-12000rmp, preferably 8000-10000rmp; the time is 5-20min, preferably 5-15min.
In some embodiments of the invention, the biomass is selected from one or more of glucose, sucrose, fructose, xylose, starch, cellulose, hemicellulose, lignin. Preferably one or more of glucose, xylose, starch, cellulose, hemicellulose and lignin.
In some embodiments of the invention, preferably, the mineral particles are selected from one or more of montmorillonite, opal, kaolinite, illite, attapulgite and chlorite, preferably montmorillonite. The purity of the mineral particles is more than or equal to 85wt%.
In some embodiments of the invention, the suspension may or may not include an organic acid, and one skilled in the art may choose according to the actual needs. The kind of the organic acid is a conventional choice in the art, and preferably the organic acid is one or more selected from acrylic acid, acrylamide-2-methylpropanesulfonic acid, citric acid, oxalic acid and salicylic acid, preferably acrylic acid.
In some embodiments of the invention, the suspension may or may not include a catalyst, and one skilled in the art may choose according to the actual needs. When a catalyst is included in the suspension, the hydrothermal carbonization of the biomass and mineral particles can be made to proceed faster and more complete. The kind of the catalyst is a conventional choice in the art, and preferably the catalyst is selected from one or more of ferrous chloride, ferrous oxide and ferrous hydroxide, preferably ferrous chloride.
In some embodiments of the invention, the mineral particles are used in an amount of 1.25 to 10g, preferably 5 to 7.5g, relative to 100mL of water. By adopting the preferable mode, the prepared rheological modifier can effectively maintain the viscosity of drilling fluid and has excellent rheological modification capability.
In some embodiments of the invention, preferably the mass ratio of biomass to mineral particles is (1-10): 1, preferably (1-5): 1. In this preferred manner, the rheology of the resulting rheology modifier can be further enhanced.
In some embodiments of the invention, to ensure adequate performance of the biomass and mineral particle reactions, the hydrothermal carbonization reaction conditions include: the temperature is 160-300 ℃, preferably 180-260 ℃; the time is 4-40 hours, preferably 6-36 hours. When the biomass used is glucose, sucrose, fructose, xylose, starch and hemicellulose, the temperature of the hydrothermal carbonization reaction should be 180 ℃ or more; when the biomass used is cellulose, the reaction temperature should be 220 ℃ or higher; when the biomass used is lignin, the reaction temperature should be 230 ℃ or higher.
In some embodiments of the invention, the hydrothermal carbonization reaction may be performed in a reaction vessel conventional in the art. Preferably, the hydrothermal carbonization reaction is performed in a reaction vessel having closed conditions, for example, a polytetrafluoroethylene closed tank.
In some embodiments of the invention, the volume ratio of the suspension to the volume of the reaction vessel is preferably 60% or more, preferably 80% or more. That is, when the volume of the reaction vessel is 100mL, the volume of the suspension to be added should be 80mL or more.
The conditions for the centrifugation and drying in the step (2) are not particularly limited in the present invention, and preferably, the conditions for the centrifugation include: centrifuge at 10000rpm for 10-15min. The drying conditions include: drying at 60-100deg.C.
In a second aspect, the present invention provides a rheology modifier for water-based drilling fluids produced by the above method. The rheological modifier is a nanocomposite obtained by hydrothermal carbonization reaction of biomass and mineral particles with wide sources at high temperature. The surface of the nano composite material particle contains a large amount of oxygen-containing functional groups, and a grid structure can be formed by the nano composite material particle and clay particles through electrostatic action, hydrogen bonding action and the like, so that the rheological property of the water-based drilling fluid under the ultra-high temperature condition is improved. Meanwhile, the nanocomposite has excellent high-temperature stability, excellent dispersion performance in water, no thermal degradation and failure like the traditional polymer at high temperature, and can effectively regulate and control rheological property under the ultra-high temperature condition. Therefore, the rheological modifier provided by the invention can effectively maintain the viscosity of drilling fluid and has excellent rheological modification capability.
In some embodiments of the invention, the rheology modifier has an average particle size of 2-10 μm and the surface of the rheology modifier contains oxygen-containing functional groups.
In a third aspect the present invention provides a water-based drilling fluid comprising a rheology modifier for a water-based drilling fluid according to the second aspect above.
In some embodiments of the invention, the rheology modifier is preferably used in an amount of 0.3 to 5g, preferably 0.5 to 3g, relative to 100mL of the water-based drilling fluid. When the amount of the rheology modifier satisfies the above conditions, the rheology modifier can be better exerted.
In some embodiments of the invention, the water-based drilling fluid further comprises a sulfonated phenolic resin fluid loss additive SMP, a sulfonated lignite resin fluid loss additive SPNH, a zwitterionic polymer coating agent FA367, and a sulfonate copolymer fluid loss additive DSP-2; and the total weight of the water-based drilling fluid is taken as a reference, the content of the sulfonated phenolic resin filtrate reducer SMP is 1-5%, the content of the sulfonated lignite resin filtrate reducer SPNH is 1-5%, the content of the zwitterionic polymer coating agent FA367 is 0.1-0.5%, and the content of the sulfonate copolymer filtrate reducer DSP-2 is 0.1-0.5%.
In some embodiments of the invention, the apparent viscosity of the water-based drilling fluid is 45-47 mPa-s at ambient temperature; the dynamic plastic ratio is 0.8-0.85; after hot rolling at 220 ℃, the apparent viscosity of the water-based drilling fluid is 25-28 mPas; the dynamic plastic ratio is 0.67-0.8; the viscosity retention was not less than 55%.
The present invention will be described in detail by examples. In the following examples and comparative examples:
biomass and montmorillonite are provided by Shanghai test group of China, wherein the purity of montmorillonite is more than 90 wt%;
the sulfonated lignite resin filtrate reducer SPNH for the drilling fluid is provided by Zhengzhou Yuhua auxiliary agent Co., ltd;
zwitterionic polymer coating agent FA367 was supplied by civil eastern slurry materials limited;
the sulfonated phenolic resin filtrate reducer SMP is provided by the chemical technology Co., ltd;
the sulfonate copolymer filtrate reducer DSP-2 is provided by Shandong cis source oil technology Co., ltd;
the high temperature rheology modifier Driscal-D is supplied by Chemicals Inc. of Chemicals, chevron.
In the following test examples:
the particle size distribution of the rheology modifier produced was tested using a Bettersize 2000 laser particle size distribution meter;
rheological parameters including apparent viscosity AV, plastic viscosity PV, dynamic shear force YP and dynamic plastic ratio YP/PV were tested by a ZNN-D6 six-speed viscometer;
the Zeta potential is tested by a Bruce sea Zeta potentiometer;
the viscosity retention is calculated by the following formula:
wherein η is the viscosity retention, AV AHR AV, apparent viscosity after hot rolling BHR Is apparent viscosity before hot rolling.
Example 1
(1) 7.5g of glucose is added into 100mL of deionized water, and the mixture is stirred for 15min under the conditions that the stirring speed is 8000rmp and the temperature is 25 ℃ to obtain a first suspension;
(2) Adding 7.5g of montmorillonite into the first suspension, and stirring for 15min at a stirring speed of 8000rmp and a temperature of 25 ℃ to obtain a second suspension;
(3) 3.5g of acrylic acid was added to the second suspension, and the mixture was stirred at a stirring speed of 8000rmp and a temperature of 25℃for 15 minutes to obtain a suspension.
(4) 80mL of the suspension is taken and put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 12 hours at 180 ℃ to obtain a reaction product;
(5) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-1.
Example 2
(1) 10g of hemicellulose is added into 100mL of deionized water, and the mixture is stirred for 15min under the conditions that the stirring speed is 8000rmp and the temperature is 25 ℃ to obtain a first suspension;
(2) 5g of montmorillonite is added into the first suspension, and the mixture is stirred for 15min under the conditions that the stirring speed is 8000rmp and the temperature is 25 ℃ to obtain a suspension;
(3) 80mL of the suspension is taken and put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 16 hours at 230 ℃ to obtain a reaction product;
(4) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-2.
Example 3
(1) Adding 15g of lignin into 100mL of deionized water, and stirring for 15min at the stirring speed of 8000rmp and the temperature of 25 ℃ to obtain a first suspension;
(2) 5g of montmorillonite is added into the first suspension, and the mixture is stirred for 15min under the conditions that the stirring speed is 8000rmp and the temperature is 25 ℃ to obtain a suspension;
(3) 80mL of the suspension is taken and put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 12 hours at 230 ℃ to obtain a reaction product;
(4) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-3.
Example 4
(1) Adding 7.5g of starch into 100mL of deionized water, and stirring for 15min at the stirring speed of 8000rmp and the temperature of 25 ℃ to obtain a first suspension;
(2) 5g of montmorillonite is added into the first suspension, and the mixture is stirred for 15min under the conditions that the stirring speed is 8000rmp and the temperature is 25 ℃ to obtain a second suspension;
(3) 2.5g of acrylic acid was added to the second suspension, and the mixture was stirred at a stirring speed of 8000rmp and a temperature of 25℃for 15 minutes to obtain a suspension.
(4) 80mL of the suspension is taken and put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 24 hours at 210 ℃ to obtain a reaction product;
(5) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-4.
Example 5
(1) Adding 7.5g of cellulose into 100mL of deionized water, and stirring for 15min at the stirring speed of 8000rmp and the temperature of 25 ℃ to obtain a first suspension;
(2) 7.5g of montmorillonite was added to the first suspension, and stirred at a stirring speed of 8000rmp and a temperature of 25℃for 15 minutes to obtain a second suspension.
(3) Adding 0.75g FeCl to the second suspension 2 Stirring at 8000rmp and 25℃for 15min to give a suspension.
(4) 80mL of the suspension is put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 16 hours at 230 ℃ to obtain a reaction product;
(5) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-5.
Example 6
(1) Adding 5g of xylose into 100mL of deionized water, and stirring for 15min at the stirring speed of 8000rmp and the temperature of 25 ℃ to obtain a first suspension;
(2) Adding 2.5g of montmorillonite into the first suspension, and stirring for 15min at a stirring speed of 8000rmp and a temperature of 25 ℃ to obtain a second suspension;
(3) 2.5g of acrylic acid was added to the second suspension, and the mixture was stirred at a stirring speed of 8000rmp and a temperature of 25℃for 15 minutes to obtain a suspension.
(4) 80mL of the suspension is taken and put into a sealed polytetrafluoroethylene tank with the solvent of 100mL, and the reaction is carried out for 12 hours at 180 ℃ to obtain a reaction product;
(5) The reaction product was centrifuged at 10000rpm for 10min, dried at 80℃for 24h, and crushed through 100 mesh to obtain a rheology modifier for water-based drilling fluid, designated CDPC-6.
Comparative example 1
A rheology modifier for water-based drilling fluids was prepared as in example 1 except that in step (1) 7.5g glucose was changed to 2.5g glucose; in step (3), the "5g of acrylic acid" is changed to "0g of acrylic acid". The resulting product was designated D-1.
Comparative example 2
A rheology modifier for water-based drilling fluids was prepared as in example 2, except that in step (1) 10g hemicellulose was changed to 5g hemicellulose; in the step (4), the reaction at 230 ℃ for 8h is changed into the reaction at 140 ℃ for 6h. The resulting product was designated D-2.
Comparative example 3
A rheology modifier for water-based drilling fluids was prepared as in example 3, except that in step (1) the "15g lignin" was changed to "5g lignin"; in the step (4), the reaction at 230 ℃ for 12h is changed into the reaction at 150 ℃ for 8 h. The resulting product was designated D-3.
Comparative example 4
A rheology modifier for water-based drilling fluids was prepared as in example 4, except that in step (1) 7.5g of starch was changed to 2.5g of starch; in the step (4), the reaction at 210 ℃ for 24 hours is changed into the reaction at 160 ℃ for 12 hours. The resulting product was designated D-4.
Comparative example 5
A rheology modifier for water-based drilling fluids was prepared as in example 5, except that in step (1) 7.5g of cellulose was changed to 2.5g of cellulose; in step (3)"0.75g FeCl 2 "change to" 0g FeCl 2 ". The resulting product was designated D-5.
Comparative example 6
A rheology modifier for water-based drilling fluids was prepared as in example 6, except that in step (1) the "5g xylose" was changed to "2.5g xylose"; in the step (4), the reaction at 180 ℃ for 12 hours is changed into the reaction at 100 ℃ for 12 hours. The resulting product was designated D-6.
Test example 1
The rheology modifiers prepared in examples 1-6 and comparative examples 1-6 above were subjected to particle size distribution testing. The specific process is as follows: the rheology modifier was formulated as a 0.1% suspension, stirred at 10000r/min for 30min, sonicated for 10min and then tested for particle size distribution using a Bettersize 2000 laser particle size distribution meter, the results are shown in Table 1. As can be seen from Table 1, the rheology modifiers produced have an average particle size of between 2 and 10. Mu.m.
TABLE 1
Test example 2
Preparing bentonite-based slurry: 16g of sodium bentonite (Hua Wei bentonite Co., ltd.) for drilling fluid was added to 400mL of tap water, stirred for 30 minutes at 10000r/min, and then the mixture was allowed to stand in a sealed state for 24 hours to obtain a pre-hydrated 4% bentonite slurry.
After adding 4g of the rheology modifiers prepared in examples 1 to 6 and comparative examples 1 to 6 and Driscal-D, respectively, to 400mL of bentonite-based slurry, stirring for 20min at 10000r/min, the rheological property, the filtration property and the Zeta potential of the slurry were tested;
transferring the slurry into an aging tank, placing the aging tank into a high-temperature roller heating furnace, hot rolling for 16h at 220 ℃, cooling to room temperature, stirring for 10min at 10000r/min, testing the rheological property, the filtration property and the Zeta potential of the slurry, and calculating the viscosity retention rate. The results are shown in Table 2.
TABLE 2
As can be seen from the test results in Table 2, the apparent viscosity of the experimental slurries was substantially unchanged after the rheology modifiers prepared in examples 1 to 6 of the present invention were added to the 4% bentonite-based slurry prior to hot rolling at 220 ℃; and after the traditional rheological modifier Driscal-D is added, the viscosity of the experimental pulp is obviously increased. After hot rolling at 220 ℃, the apparent viscosity of the experimental slurries was not significantly reduced only when the rheology modifiers prepared in examples 1-6 of the present invention were used; the viscosity retention was greater than 66% and significantly higher than that of comparative examples 1-6 and Driscal-D. The rheology modifiers for water-based drilling fluids prepared in examples 1-6 of the present invention are shown to have significantly better properties to maintain drilling fluid viscosity after hot rolling than comparative examples 1-6 and drical-D.
When the rheology modifiers prepared in examples 1-6 of the present invention were used, the dynamic to plastic ratio of the experimental slurries after hot rolling at 220 ℃ was greater than the dynamic to plastic ratio of the experimental slurries before hot rolling, and significantly higher than comparative examples 1-6 and drical-D. The rheological modifier for the water-based drilling fluid prepared in the embodiment 1-6 is obviously better than the rheological modifier for the water-based drilling fluid prepared in the comparative embodiment 1-6 and the Driscal-D in maintaining the rock carrying capacity of the drilling fluid after hot rolling.
When the rheology modifiers prepared in examples 1-6 of the present invention were used, the absolute value of the Zeta potential of the experimental slurries was significantly greater than that of comparative examples 1-6, and was essentially unchanged before and after hot rolling at 220 ℃. The experimental slurry prepared by the rheological modifier provided by the invention has good dispersibility and is relatively stable.
Test example 3
A bentonite slurry was prepared in the same manner as in test example 2, and then 8.0g of a sulfonated phenolic resin filtrate reducer SMP, 1.2g of NaOH, 16.0g of a lignite resin filtrate reducer SPNH, 2.0g of a zwitterionic polymer coating agent FA367, and 1.0g of a sulfonate copolymer filtrate reducer DSP-2 were sequentially added to 400mL of the bentonite slurry to prepare a drilling fluid base slurry Z1.
After adding 4g of the rheology modifiers prepared in examples 1 to 6 and comparative examples 1 to 6 and Driscal-D, respectively, to drilling fluid Z1, stirring for 20min at 10000r/min, the rheological properties of the drilling fluid were tested;
the drilling fluid is placed in an aging tank, the aging tank is placed in a high-temperature roller heating furnace, the temperature of 220 ℃ is hot rolled for 16 hours, the temperature is cooled to room temperature, 10000r/min is stirred for 10min, the rheological property of the drilling fluid is tested, and the results are shown in Table 3.
TABLE 3 Table 3
As can be seen from the test results in Table 3, after different types of rheological modifiers are added into the drilling fluid Z1 and heated to 220 ℃ for 16 hours, the rheological modifiers for the water-based drilling fluid prepared in the examples 1-6 can still effectively maintain the rheological property of the drilling fluid Z1, the apparent viscosity is basically maintained at about 27 mPas, the viscosity maintenance rate is more than 55%, the dynamic plastic ratio is more than 0.67 Pa/(mPas), and the rheological property adjustment capability is better than that of the drilling fluid Z1-6 and the Driscal-D. The rheological modifier for the water-based drilling fluid prepared in the examples 1-6 has good rheological property regulated at high temperature.
In conclusion, the rheological modifier for the water-based drilling fluid prepared by the method provided by the invention still has good rheological modification capability at high temperature.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (14)
1. A method for preparing a rheology modifier for a water-based drilling fluid, comprising the steps of:
(1) Carrying out hydrothermal carbonization reaction on the suspension to obtain a reaction product;
(2) Centrifuging, drying and crushing the reaction product to obtain the rheological modifier;
wherein the suspension comprises: biomass, water, mineral particles, and optionally organic acids and/or catalysts; the mineral particles are used in an amount of 1.25-10g relative to 100mL of water; the mass ratio of the biomass to the mineral particles is (1-10): 1.
2. The method of claim 1, wherein the suspension is prepared by a preparation method comprising the steps of: biomass, water, mineral particles, and optionally organic acids and/or catalysts are mixed.
3. The method of claim 2, wherein the mixing conditions comprise: the temperature is 15-40 ℃; the stirring speed is 4000-12000rmp; the time is 15-80min.
4. A method according to claim 3, wherein the mixing conditions comprise: the temperature is 20-35 ℃; stirring speed is 8000-10000rmp; the time is 35-75min.
5. The method of any one of claims 1-4, wherein the biomass is selected from one or more of glucose, sucrose, fructose, xylose, starch, cellulose, hemicellulose, lignin;
and/or the mineral particles are selected from one or more of montmorillonite, opal, kaolinite, illite, attapulgite and chlorite;
and/or the organic acid is selected from one or more of acrylic acid, acrylamide-2-methylpropanesulfonic acid, citric acid, oxalic acid and salicylic acid;
and/or the catalyst is selected from one or more of ferrous chloride, ferrous oxide and ferrous hydroxide.
6. The method of claim 5, wherein the mineral particles are montmorillonite; the purity of the mineral particles is more than or equal to 85wt%.
7. The method of any one of claims 1-6, wherein the mineral particles are used in an amount of 5-7.5g relative to 100mL of water; the mass ratio of the biomass to the mineral particles is (1-5): 1.
8. The method of claim 1, wherein the hydrothermal carbonization conditions comprise: the temperature is 160-300 ℃; the time is 4-40h.
9. The method of claim 8, wherein the hydrothermal carbonization conditions comprise: the temperature is 180-260 ℃; the time is 6-36h.
10. A rheology modifier for water-based drilling fluids obtainable by the process of any one of claims 1 to 9.
11. The rheology modifier for water-based drilling fluids according to claim 10, wherein the rheology modifier has an average particle size of 2 to 10 μm and the surface of the rheology modifier contains oxygen-containing functional groups.
12. A water-based drilling fluid comprising the rheology modifier for water-based drilling fluid according to claim 10 or 11.
13. The water-based drilling fluid of claim 12, wherein the amount of the rheology modifier for the water-based drilling fluid is 0.3-5g relative to 100mL of the water-based drilling fluid.
14. The water-based drilling fluid of claim 13, wherein the amount of the rheology modifier for the water-based drilling fluid is 0.5-3g relative to 100mL of the water-based drilling fluid.
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| CN108329896B (en) * | 2018-03-27 | 2020-11-06 | 中国石油大学(华东) | High-temperature-resistant artificial clay, preparation method thereof and water-based drilling fluid |
| CN111777998B (en) * | 2020-07-22 | 2022-07-29 | 中国石油大学(华东) | Environment-friendly ultrahigh-temperature fluid loss additive composition, preparation method thereof and water-based drilling fluid |
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| EP1130074A1 (en) * | 2000-03-02 | 2001-09-05 | Institut Francais Du Petrole | Filtrate reducing additive and well fluid containg it |
| CN110105941A (en) * | 2019-05-20 | 2019-08-09 | 中国石油大学(华东) | Application and high temperature aqueous-based drilling fluid of the carbosphere as high temperature aqueous-based drilling fluid sealing agent |
| CN110204667A (en) * | 2019-05-20 | 2019-09-06 | 中国石油大学(华东) | Polymer modification carbosphere and its preparation method and application |
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