CN114774093A - Organic-inorganic composite polymer for improving shear force of water-based drilling fluid and preparation method thereof - Google Patents
Organic-inorganic composite polymer for improving shear force of water-based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an organic-inorganic composite polymer for improving the shear force of a water-based drilling fluid and a preparation method thereof, the organic-inorganic composite polymer comprises inorganic modified soil, an organic polymer monomer mixed system, an excitation system and water, the inorganic modified soil consists of polyoxyethylene modified sodium bentonite, the organic polymer monomer mixed system consists of acrylamide, acrylate and 2-acrylamido-methyl propane sulfonate, the excitation system consists of persulfate and sulfite, the persulfate is one or more of sodium salt, potassium salt and ammonium salt, the sulfite is one or more of sodium salt, potassium salt and ammonium salt, and the water adopts deionized water or distilled water. The organic-inorganic composite polymer can enhance the shear force (including dynamic shear force and static shear force) of a water-based drilling fluid system, namely the pumping loss is low in the drilling fluid pumping process, and the suspension capacity of the drilling fluid is enhanced when the drilling fluid is static or flows at low speed.
Description
Technical Field
The invention belongs to the technical field of drilling engineering, and particularly relates to an organic-inorganic composite polymer for improving the shearing force of water-based drilling fluid and a preparation method thereof.
Background
In the drilling process, drilling fluid is used as circulating fluid to carry rock debris, and meanwhile, a solid-phase weighting agent is added to improve the density of the drilling fluid to balance the formation pressure and the formation side pressure. In the drilling process, the capability of dynamically carrying rock debris or suspended weighting agents is poor, so that the well cleaning capability is poor easily, the repeated drilling and rock breaking are caused, and the drilling speed is reduced. In the drilling process of the shale gas horizontal well, the shale gas horizontal well water-based drilling fluid is required to have better capability of dynamically carrying rock debris or suspended weighting agents, and the water-based drilling fluid is also required to have better capability of statically carrying the rock debris or suspended weighting agents, if the dynamic suspension stability and the static suspension stability are poor, the rock debris or the weighting agents are easy to precipitate and block the bottom of the well or gather at the local part to cause sticking, and in addition, because the horizontal section is longer in the drilling process of the shale gas horizontal well, the pumping capability of the drilling fluid is required to be good, so the shale gas horizontal well water-based drilling fluid is required to have unique rheological property: such as low apparent viscosity, high dynamic shear, high static shear and the like. The hydrated sodium bentonite can be used as a commonly used tackifying and shearing agent for drilling fluid, the bentonite forms a grid structure characteristic in aqueous solution through hydration dispersion and contact with a surface, an end surface and the like so as to improve the viscosity of a liquid phase, the bentonite is often mixed with other tackifiers for use due to weak structure, most of currently used drilling fluid tackifiers are modified cellulose, modified guar gum, xanthan gum, acrylamide polymers and the like, although the tackifiers have advantages in certain aspects so as to improve the suspension performance of the drilling fluid, in the shale gas horizontal well water-based drilling fluid containing a large amount of inhibitors and plugging filtrate reducers under high temperature conditions, the performance of the tackifiers is reduced, and the defects that the apparent viscosity of the water-based drilling fluid is increased greatly, the dynamic shear force is increased greatly and the static shear force is lower are shown after the tackifiers are added into the shale gas horizontal well water-based drilling fluid, therefore, the performance of suspended rock debris is greatly reduced under the condition of a horizontal state, so that the water-based drilling fluid is difficult to carry rock debris in a long horizontal section of shale gas, a well hole is difficult to keep clean, the underground drilling sticking risk is very large, and meanwhile, as the apparent viscosity is greatly increased, the pumping performance of the drilling fluid is poor, the pumping pressure is high, and underground accidents such as bottom hole leakage and the like are easily caused.
The research on various drilling fluid tackifiers with salt resistance and obvious tackifying effect is very important for drilling fluids, and particularly, the introduction of monomers containing special functional groups on the molecular chain of a conventional polymer is a main method for researching the drilling fluid tackifiers. For example, the patent CN106608946A discloses a copolymer association used for a tackifier of drilling fluid and a preparation method thereof, the copolymer association contains a structural unit A, a structural unit B, a structural unit C and a structural unit D, the structural unit A is N, N-dimethylacrylamide, the structural unit B is zwitterionic monomer N-methyl diallyl propane sulfonate (MAPS), the structural unit C is an ion association body of the structural unit B and cationic polyamine, the structural unit D is starch, the content of the N, N-dimethylacrylamide is 6 to 45 percent based on the total amount of the associated copolymer, the total content of the zwitter-ion monomer N-methyldiallylpropyl propanesulfonate is 5 to 35 percent, the content of the cationic polyamine is 2-30%, and the content of the starch is 5-35%. The publication patent CN110643335A discloses a tackifier modified vegetable gum for drilling fluid and a preparation method thereof, wherein the modified vegetable gum comprises the following components in parts by weight: 7-11 parts of guar gum, 0.6-1 part of hydrolyzed polyacrylamide, 1.1-1.3 parts of borax, 0.8-1.5 parts of sodium hydroxide aqueous solution, 1.2-1.5 parts of ethylene oxide and 6-6.5 parts of polyurethane. The publication patent CN104312549B discloses a high-concentration CaCl-resistant agent for water-based drilling fluid2The tackifier is prepared by polymerizing polyvinyl alcohol serving as a main body with a polymerizable macromolecule M and a polymerizable monomer N under the condition of an initiator to form the tackifier, wherein the polymerizable macromolecule M is one or a mixture of xanthan gum, guar gum, hydroxyethyl cellulose or hydroxypropyl cellulose, and the polymerizable monomer N is one or a mixture of acrylamide, N-dimethylacrylamide, N-diethylacrylamide, isopropylacrylamide or isobutylacrylamide.
From the prior invention patents, the organic synthetic polymer and the modified polymer are mainly used, and many of the soil-free phase water-based drilling fluids are developed aiming at soil-free phase water-based drilling fluids, because the net-shaped structure formed by the lack of bentonite can only depend on the structure formed by intertwining organic synthetic polymers to suspend inert weighting agents and rock debris, has certain advantages in the vertical drilling process, but only shows good tackifying performance after the organic synthetic polymer is added in the environment that the shale gas horizontal well water-based drilling fluid contains a large amount of inhibitors, lubricants, plugging fluid loss additives and the like, but the shear force increasing effect is not strong, the capability of improving dynamic and static carrying rock debris or suspending weighting agent is weaker, therefore, the soil-phase-free water-based drilling fluid is not suitable for being prepared into the water-based drilling fluid for drilling the shale gas horizontal well with high requirements on working conditions and more functions.
Most of shale gas horizontal well water-based drilling fluids contain sodium bentonite, the sodium bentonite forms a sheet structure after hydration, expansion and dispersion, and an inert weighting agent and rock debris in the drilling fluid are suspended by forming a structure through mutual contact of sheets, so that the shale gas horizontal well water-based drilling fluid is one of the advantages and characteristics. In the shale gas horizontal well water-based drilling fluid containing sodium bentonite, a common polymer only forms a structure by adsorbing bentonite to strengthen mutual contact between the bentonite, thereby strengthening the suspension performance of the water-based drilling fluid, and how to strengthen a reversible structure of mutual contact between the bentonite, namely, the polymer forms a suspension capability of being capable of being disassembled under a high shear condition and recovering a net structure under a low shear condition, and more particularly, the polymer has the rheological characteristics of lower apparent viscosity, high dynamic shear and higher static shear and is a necessary condition for realizing suspension of a weighting agent and rock debris in a horizontal well drilling process and under a static condition. The organic-inorganic composite polymer which integrates bentonite and organic polymer is changed in structure, not only can suspend weighting agent and rock debris under the conditions of high temperature and containing a large amount of processing agents such as inhibitor and the like, but also can interact with sheet bentonite formed by hydration, so that the hydrodynamic shear force and static shear force of the shale gas horizontal well water-based drilling fluid are greatly improved, the improvement range of apparent viscosity is small, and the shear dilution and shear recovery capability of the drilling fluid are facilitated, thereby the suspension capability of the shale gas horizontal well water-based drilling fluid can be enhanced.
Disclosure of Invention
The invention aims to provide an organic-inorganic composite polymer for improving the shear force of water-based drilling fluid and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
the organic-inorganic composite polymer for improving the shearing force of the water-based drilling fluid comprises inorganic modified soil, an organic polymer monomer mixed system, an excitation system and water.
Wherein, the inorganic modified soil consists of polyoxyethylene modified sodium bentonite, the polyoxyethylene content is 0.01 to 3 percent, the polyoxyethylene molecular weight is selected from one or more than one of 1 ten thousand to 500 ten thousand, and the sodium bentonite content is 0.5 to 20 percent, which is calculated by the total weight of ingredients when preparing the organic-inorganic composite polymer.
Preferably, the polyoxyethylene content is 0.05-1%, the polyoxyethylene molecular weight is 1-100 ten thousand, and the sodium bentonite content is 1-10%.
The organic polymer monomer mixed system consists of acrylamide, acrylate and 2-acrylamide-methyl propane sulfonate.
Preferably, the acrylate and the 2-acrylamido-methylpropanesulfonic acid salt are neutralized by acrylic acid, 2-acrylamido-methylpropanesulfonic acid and sodium hydroxide, potassium hydroxide or lithium hydroxide to produce sodium acrylate and sodium 2-acrylamido-methylpropanesulfonate, potassium acrylate and potassium 2-acrylamido-methylpropanesulfonate or lithium acrylate and lithium 2-acrylamido-methylpropanesulfonate.
Preferably, the content of acrylamide is 5% -30%, the content of acrylic acid is 1% -12%, and the content of 2-acrylamido-methylpropanesulfonic acid is 0.5% -10% by weight based on the total weight of ingredients in preparing the organic-inorganic composite polymer.
Preferably, the content of acrylamide is 10% -20%, the content of acrylic acid is 3% -10%, and the content of 2-acrylamido-methylpropanesulfonic acid is 1% -8%.
The excitation system is composed of persulfate and sulfite, wherein the persulfate is one or more of sodium salt, potassium salt and ammonium salt, and the sulfite is one or more of sodium salt, potassium salt and ammonium salt.
Preferably, the persulfate is one or more of sodium persulfate, ammonium persulfate and potassium persulfate, and the sulfite is one or more of sodium sulfite, potassium sulfite and ammonium sulfite.
Preferably, potassium persulfate and sodium sulfite or ammonium persulfate and sodium sulfite constitute an excitation system.
Preferably, the content of the persulfate is 0.01-2%, and the content of the sulfite is 0.01-1%, based on the total weight of the ingredient when preparing the organic-inorganic composite polymer.
Preferably, the persulfate content is 0.1% -0.8%, and the sulfite content is 0.05% -0.6%.
Wherein, the water is deionized water or distilled water, and the content of the water is the residual amount of inorganic modified soil, an organic polymer monomer mixed system and an excitation system removed from the total weight of ingredients in the preparation of the organic-inorganic composite polymer.
Preferably, deionized water is used as the water.
The preparation method of the organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid comprises the following steps:
the method comprises the following steps: preparing inorganic modified soil: dispersing sodium bentonite in deionized water under the condition of high-speed stirring, adding polyoxyethylene after the sodium bentonite is fully dispersed, stirring at a low speed for more than 4 hours at a temperature of 70 ℃, drying at a temperature of not higher than 110 ℃ to obtain inorganic modified soil, and crushing into powder by using a crusher;
step two: organic polymer monomer mixed solution: dissolving acrylic acid and 2-acrylamido-methylpropanesulfonic acid in water, adjusting the pH value to 6-7 by using sodium hydroxide, potassium hydroxide or lithium hydroxide, neutralizing to generate a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid sodium, a mixed solution of potassium acrylate and 2-acrylamido-methylpropanesulfonic acid potassium or a mixed solution of lithium acrylate and 2-acrylamido-methylpropanesulfonic acid lithium, and adding acrylamide to dissolve to form an organic polymer monomer mixed solution;
step three: adding the prepared organic polymer monomer mixed solution into the prepared inorganic modified soil, completely dispersing the inorganic modified soil in the organic polymer monomer mixed aqueous solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of persulfate and sulfite under the protection of nitrogen, stirring at a low speed for reaction for 5-6 hours under the protection of nitrogen, drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer, and pulverizing the organic-inorganic composite polymer into powder by adopting a pulverizer.
The invention has the advantages that:
the invention adopts an organic-inorganic composite polymer formed by inserting polyoxyethylene into a sodium bentonite lattice and then polymerizing the polyoxyethylene with a water-soluble monomer, because the polyoxyethylene is a nonionic polymer and enters the sodium bentonite lattice layer under the drive of a complex and a hydrogen bond, the zeta potential on the surface of the sodium bentonite has smaller reduction amplitude, the formed organic-inorganic composite polymer not only increases the structural strength of the water-based drilling fluid by mutual winding of polymer molecules in the shale gas water-based drilling fluid, but also can form mutual charge repulsion with the zeta potential of the proto-bentonite of the water-based drilling fluid, and in addition, the inserted polyoxyethylene is easy to form non-covalent bonds such as hydrogen bonds and the like with a high molecular chain formed by polymerization of the water-soluble monomer and other polymers, the organic-inorganic composite polymer disclosed by the invention can improve the shear force of the shale gas water-based drilling fluid by mutual winding of the polymer molecules, mutual interaction of the zeta potential and non-covalent bond effects, the small addition amount can increase the shearing force (including dynamic shearing force and static shearing force) of the water-based drilling fluid system, and enhance the shearing dilution and shearing recovery capability, namely, the pumping loss during the pumping of the drilling fluid is low, and the suspension capability of the drilling fluid is enhanced when the drilling fluid is static or flows at low speed.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Examples
Raw materials and sources thereof:
sodium bentonite: chuqing drilling fluid technical service company
Sodium carbonate: chengdu Kelong chemical engineering Co Ltd
Polyoxyethylene (molecular weight 5 ten thousand, 10 ten thousand, 50 ten thousand, respectively): chengdu Kelong chemical Co Ltd
Acrylamide: chengdu Kelong chemical Co Ltd
Acrylic acid: chengdu Kelong chemical Co Ltd
2-acrylamido-methylpropanesulfonic acid: chengdu Kelong chemical engineering Co Ltd
Sodium hydroxide: chengdu Kelong chemical Co Ltd
Ammonium persulfate: chengdu Kelong chemical Co Ltd
Potassium persulfate: chengdu Kelong chemical engineering Co Ltd
Sodium sulfite: chengdu Kelong chemical Co Ltd
Deionized water: homemade in laboratory
Xanthan gum: chuqing drilling fluid technical service company
Low viscosity polyanionic cellulose (PAC-LV): chuqing drilling fluid technical service company
Sulfonated phenolic resin: chuqing drilling fluid technical service company
Polyether amine: chuqing drilling fluid technical service company
Potassium chloride: chuqing drilling fluid technical service company
Potassium polyacrylate: chuqing drilling fluid technical service company
Diesel oil: chuqing drilling fluid technical service company
The span 80: chuqing drilling fluid technical service company
Barite powder: chuqing drilling fluid technical service company
Drilling cuttings: chuqing drilling fluid technical service company
Test performance and test method:
preparing shale gas water-based drilling fluid base slurry: adding 20g of conventional sodium bentonite and 2g of sodium carbonate into 1000mL of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h to obtain fresh water base slurry, sequentially adding 10g of low-viscosity polyanionic cellulose (PAC-LV), 40g of sulfonated phenolic resin, 40g of polyetheramine, 80g of potassium chloride, 1g of potassium polyacrylate, 50g of diesel oil and 10g of span 80 under the condition of 10000 r/min, weighting the weighting material to a certain density by adopting barite powder, and continuing stirring at a high speed for 20min to form the shale gas-water based drilling fluid base slurry. In order to simulate real drilling fluid on site, a certain amount of drill cuttings are added into the drilling fluid during the sedimentation stability test.
Evaluation of rheology: 350mL of water-based drilling fluid base slurry is measured, 0.15% of polymer is added, high-speed stirring is carried out for 20min under the condition of 10000 r/min, and the reference is given to part 1 of GB/T16783.1-2014 oil and gas industrial drilling fluid field test: the apparent viscosity AV and dynamic shear force YP, initial static shear force G 'of ten seconds and final static shear force G' of ten minutes are measured by a six-speed viscometer at the temperature of 50 ℃. After aging at 120 ℃ for 16 hours, the apparent viscosity AV and the dynamic shear force YP, the initial static shear force G' for ten seconds and the final static shear force G "for ten minutes were measured again with a six-speed viscometer at 50 ℃. The apparent viscosity AV is low, pumping is facilitated, the dynamic shear force YP value is high, the suspension capacity of the drilling fluid under the flowing condition is high, and the initial static shear force G 'of ten seconds and the final static shear force G' of ten minutes are high, so that the suspension capacity of the drilling fluid under the static condition is high. The smaller the change of the test value before and after high-temperature aging is, the more stable the high-temperature action of the drilling fluid is.
And (3) testing the sedimentation stability: measuring 350mL of water-based drilling fluid base slurry, adding 5% of drill cuttings with the granularity of 30 meshes, adding 0.15% of suspending agent, stirring at a high speed of 10000 r/min for 20min, aging at 120 ℃ for 16h, and measuring the instability coefficient TSI within 10min by using a multiple light scattering instrument TURBINALab in a certain amount. If the numerical value of the instability coefficient TSI is higher, the drilling fluid system is more unstable, and the suspension capacity is poorer; if the numerical value of the instability coefficient TSI is smaller, the drilling fluid system is more stable, and the suspension capacity is stronger.
Example 1 the following components were used for the inorganic modified soil, the organic polymer monomer mixture system and the excitation system, respectively:
in the embodiment, the content percentages of all the composition mixtures are prepared in percentage by weight, the inorganic modified soil, the organic polymer monomer mixed system and the excitation system can form the organic-inorganic composite polymer which can improve the shear force of the water-based drilling fluid by the preparation method used in the application so as to enhance the capability of the suspended solid weighting agent or rock debris, and the balance of water is calculated by taking the fluid in the process of preparing the organic-inorganic composite polymer as 100 percent.
Inorganic modified soil I: 0.2% polyoxyethylene (molecular weight 50 ten thousand) and 3% sodium bentonite;
inorganic modified soil II: 0.5% polyoxyethylene (molecular weight 5 ten thousand) and 4% sodium bentonite;
inorganic modified soil III: 0.2% polyoxyethylene (molecular weight 10 ten thousand) and 5% sodium bentonite;
organic polymer monomer mixed system I: 15% acrylamide, 6% acrylic acid and 4% 2-acrylamido-methylpropanesulfonic acid;
organic polymer monomer mixed system II: 12% acrylamide, 8% acrylic acid and 5% 2-acrylamido-methylpropanesulfonic acid;
organic polymer monomer mixed system III: 20% acrylamide, 8% acrylic acid and 5% 2-acrylamido-methylpropanesulfonic acid;
excitation system I: 0.3% potassium persulfate and 0.2% sodium sulfite;
excitation system II: 0.4% ammonium persulfate and 0.3% sodium sulfite;
example 2: the inorganic modified soil I, the organic polymer monomer mixed system I and the excitation system I are used for preparing an organic-inorganic composite polymer capable of improving the shear force of the shale gas horizontal well water-based drilling fluid, so that the suspension capacity is enhanced.
According to the total weight of the prepared organic-inorganic composite polymer ingredients of 100g, inorganic modified soil I (polyoxyethylene: 0.2g, sodium bentonite: 3 g); an organic polymer monomer mixed system I (15 g of acrylamide, 6g of acrylic acid, 4g of 2-acrylamido-methylpropanesulfonic acid); excitation system I (potassium persulfate: 0.3g, sodium sulfite: 0.2 g); deionized water: 71.3 g.
3g of sodium bentonite is dispersed in deionized water under the condition of high-speed stirring, 0.2g of polyoxyethylene is added after the sodium bentonite is fully dispersed, the mixture is stirred at a low speed for more than 4 hours at a temperature of 70 ℃, and the inorganic modified soil is obtained after drying at a temperature of not higher than 110 ℃.
6g of acrylic acid and 4g of 2-acrylamido-methylpropanesulfonic acid are dissolved in 71.3g of deionized water, the pH value is adjusted to 6-7 by adopting sodium hydroxide, a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid sodium salt is generated by neutralization, and 15g of acrylamide is added to dissolve to form an organic polymer monomer mixed solution.
Continuously adding inorganic modified soil into the organic polymer monomer mixed solution, completely dispersing the inorganic modified soil in the organic polymer monomer mixed solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of 0.3g of potassium persulfate and 0.2g of sodium sulfite under the protection of nitrogen, stirring at a low speed for reacting for 5-6 hours under the protection of nitrogen, and drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer.
The shale gas water-based drilling fluid base slurry formula is used as a base, and the weight of the shale gas water-based drilling fluid base slurry is increased to 1.5g/cm by barite3Density formation shale gas water based drilling fluid base slurry, the organic inorganic composite polymer synthesized in example 2 was added to a density of 1.5g/cm3The rheological properties of the shale gas water-based drilling fluid base slurry are tested, and compared with shale gas water-based drilling fluid added with conventional suspending agent xanthan gum as shown in table 1, it can be seen that the organic-inorganic composite polymer synthesized in example 2 has a density of 1.5g/cm relative to xanthan gum3The shale gas water-based drilling fluid has a good shear force improving effect, the increase range of the apparent viscosity is low, and the reduction range of the rheological property after aging is small.
TABLE 1 rheology evaluation of shale gas water based drilling fluids
The organic-inorganic composite polymer synthesized in example 2 was added to a drill cuttings-containing density of 1.5g/cm3In the shale gas water-based drilling fluid base slurry, after aging for 16h at the temperature of 120 ℃, a multiple light scattering instrument is adopted to test the drilling fluid within 10minAs shown in table 2 below, it can be seen that the organic-inorganic composite polymer synthesized in example 2 has a density of 1.5g/cm3The suspension performance of the shale gas water-based drilling fluid after high-temperature aging is greatly improved.
TABLE 2 Settlement stability test results for shale gas water-based drilling fluids
Example 3: the inorganic modified soil II, the organic polymer monomer mixed system II and the excitation system II are used for preparing the organic-inorganic composite polymer capable of improving the shear force of the shale gas horizontal well water-based drilling fluid so as to enhance the suspension capacity.
According to the total weight of the prepared organic-inorganic composite polymer ingredients being 100g, inorganic modified soil II (polyoxyethylene: 0.5g, sodium bentonite: 4 g); an organic polymer monomer mixed system II (12 g of acrylamide, 8g of acrylic acid, 5g of 2-acrylamido-methylpropanesulfonic acid); excitation System II (potassium persulfate: 0.4g, sodium sulfite: 0.3 g); deionized water: 69.8 g.
Dispersing 4g of sodium bentonite in deionized water under the condition of high-speed stirring, adding 0.5g of polyoxyethylene after the sodium bentonite is fully dispersed, stirring at a low speed for more than 4 hours at a temperature of 70 ℃, and drying at a temperature of not higher than 110 ℃ to obtain the inorganic modified soil.
Dissolving 8g of acrylic acid and 5g of 2-acrylamido-methylpropanesulfonic acid in 69.8g of deionized water, adjusting the pH value to 6-7 by using sodium hydroxide, neutralizing to generate a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid sodium, and adding 12g of acrylamide to dissolve to form an organic polymer monomer mixed solution.
Continuously adding inorganic modified soil into the organic polymer monomer mixed solution, completely dispersing the inorganic modified soil in the organic polymer monomer mixed solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of 0.4g of potassium persulfate and 0.3g of sodium sulfite under the protection of nitrogen, stirring at a low speed for reacting for 5-6 hours under the protection of nitrogen, and drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer.
The weight of the shale gas water-based drilling fluid base slurry is increased to 1.8g/cm by adopting barite on the basis of the formula of the shale gas water-based drilling fluid base slurry3Density formation shale gas water based drilling fluid base slurry, the organic inorganic composite polymer synthesized in example 3 was added to a density of 1.8g/cm3The rheological properties of the shale gas water-based drilling fluid base slurry are tested, and compared with the shale gas water-based drilling fluid added with the conventional suspending agent xanthan gum as shown in Table 3, it can be seen that the organic-inorganic composite polymer synthesized in example 3 has a density of 1.8g/cm relative to the xanthan gum3The shale gas water-based drilling fluid has good shear force improving effect, low increase amplitude of apparent viscosity and small reduction amplitude of viscosity after aging.
TABLE 3 rheology evaluation of shale gas water-based drilling fluids
The instability coefficient of the drilling fluid within 10min after aging for 16 hours at 120 ℃ by using a multiple light scattering instrument when the organic-inorganic composite polymer synthesized in example 3 is added into shale gas water-based drilling fluid base slurry containing cuttings with the density of 1.8g/cm3 is shown in the following table 4, and it can be seen that the organic-inorganic composite polymer synthesized in example 3 has the density of 1.8g/cm3The suspension performance of the shale gas-water-based drilling fluid after high-temperature aging is greatly improved.
TABLE 4 Settlement stability test results for shale gas water-based drilling fluids
Example 4: the inorganic modified soil III, the organic polymer monomer mixed system III and the excitation system II are used for preparing the organic-inorganic composite polymer capable of improving the shear force of the shale gas horizontal well water-based drilling fluid, so that the suspension capacity is enhanced.
According to the total weight of the prepared organic-inorganic composite polymer ingredients of 100g, inorganic modified soil III (polyoxyethylene: 0.2g, sodium bentonite: 5 g); an organic polymer monomer mixed system III (acrylamide: 20g, acrylic acid: 8g, 2-acrylamido-methylpropanesulfonic acid: 5 g); excitation System II (potassium persulfate: 0.4g, sodium sulfite: 0.3 g); deionized water: 61.1 g.
Dispersing 4g of sodium bentonite in deionized water under the condition of high-speed stirring, adding 0.2g of polyoxyethylene after the sodium bentonite is fully dispersed, stirring at a low speed for more than 4 hours at a temperature of 70 ℃, and drying at a temperature of not higher than 110 ℃ to obtain the inorganic modified soil.
Dissolving 8g of acrylic acid and 5g of 2-acrylamido-methylpropanesulfonic acid in 61.1g of deionized water, adjusting the pH value to 6-7 by using sodium hydroxide, neutralizing to generate a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid, and adding 20g of acrylamide to dissolve to form an organic polymer monomer mixed solution.
Continuously adding inorganic modified soil into the organic polymer monomer mixed solution to completely disperse the inorganic modified soil in the organic polymer monomer mixed aqueous solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of 0.4g of potassium persulfate and 0.3g of sodium sulfite under the protection of nitrogen, stirring at a low speed for reaction for 5-6 hours under the protection of nitrogen, and drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer.
The weight of the shale gas water-based drilling fluid base slurry is increased to 2.0g/cm by adopting barite on the basis of the formula of the shale gas water-based drilling fluid base slurry3Density formation shale gas water based drilling fluid base slurry, the organic inorganic composite polymer synthesized in example 4 was added to a density of 2.0g/cm3The rheological properties of the shale gas water-based drilling fluid base slurry were tested and compared with shale gas water-based drilling fluids incorporating conventional suspending agent xanthan gum as shown in table 5, and it can be seen thatExample 4 the synthesized organic-inorganic composite Polymer had a relative Density of 2.0g/cm to Xanthan Gum3The shale gas water-based drilling fluid has good shear force improving effect, low increase amplitude of apparent viscosity and small reduction amplitude of viscosity after aging.
TABLE 5 rheology evaluation of shale gas water based drilling fluids
The organic-inorganic composite polymer synthesized in example 4 was added to a density of 2.0g/cm containing drill cuttings3The instability coefficient of the shale gas water-based drilling fluid base slurry in 10min tested by using a multiple light scattering instrument after aging for 16h at the temperature of 120 ℃ is shown in Table 6, and it can be seen that the organic-inorganic composite polymer synthesized in example 4 has a density of 2.0g/cm3The suspension performance of the shale gas water-based drilling fluid after high-temperature aging is greatly improved.
TABLE 6 Settlement stability test results for shale gas water-based drilling fluids
Example 5: the inorganic modified soil III, the organic polymer monomer mixed system I and the excitation system II are used for preparing the organic-inorganic composite polymer capable of improving the shear force of the shale gas horizontal well water-based drilling fluid so as to enhance the suspension capacity.
According to the total weight of the prepared organic-inorganic composite polymer ingredients being 100g, inorganic modified soil III (polyoxyethylene: 0.2g, sodium bentonite: 5 g); an organic polymer monomer mixed system I (acrylamide: 15g, acrylic acid: 6g, 2-acrylamido-methylpropanesulfonic acid: 4 g); excitation system II (potassium persulfate: 0.4g, sodium sulfite: 0.3 g); deionized water: 69.1 g.
5g of sodium bentonite is dispersed in deionized water under the condition of high-speed stirring, 0.2g of polyoxyethylene is added after the sodium bentonite is fully dispersed, the mixture is stirred at a low speed for more than 4 hours at a temperature of 70 ℃, and the inorganic modified soil is obtained after drying at a temperature of not higher than 110 ℃.
Dissolving 6g of acrylic acid and 4g of 2-acrylamido-methylpropanesulfonic acid in 69.1g of deionized water, adjusting the pH value to 6-7 by using sodium hydroxide, neutralizing to generate a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid, and adding 15g of acrylamide to dissolve to form an organic polymer monomer mixed solution.
Continuously adding inorganic modified soil into the organic polymer monomer mixed solution, completely dispersing the inorganic modified soil in the organic polymer monomer mixed solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of 0.4g of potassium persulfate and 0.3g of sodium sulfite under the protection of nitrogen, stirring at a low speed for reacting for 5-6 hours under the protection of nitrogen, and drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer.
The shale gas water-based drilling fluid base slurry formula is used as a base, and the weight of the shale gas water-based drilling fluid base slurry is increased to 1.2g/cm by barite3Density formation shale gas water based drilling fluid base slurry, the organic inorganic composite polymer synthesized in example 5 was added to a density of 1.2g/cm3The rheological properties of the shale gas water-based drilling fluid base slurry were measured and compared with shale gas water-based drilling fluids added with conventional suspending agent xanthan gum as shown in table 7, it can be seen that the organic-inorganic composite polymer synthesized in example 5 has a density of 1.2g/cm relative to xanthan gum3The shale gas water-based drilling fluid has good shear force improving effect, low increase amplitude of apparent viscosity and small reduction amplitude of viscosity after aging.
TABLE 7 rheology evaluation of shale gas water-based drilling fluids
The organic-inorganic composite polymer synthesized in example 5 was added to a density of 1.2g/cm containing drill cuttings3Shale gas waterThe instability coefficient of the drilling fluid in 10min after aging for 16h at 120 ℃ in the base drilling fluid base slurry by using a multiple light scattering instrument is shown in Table 8, and it can be seen that the organic-inorganic composite polymer synthesized in example 5 has a density of 1.2g/cm3The suspension performance of the shale gas-water-based drilling fluid after high-temperature aging is greatly improved.
TABLE 8 Settlement stability test results for shale gas water-based drilling fluids
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (10)
1. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid is characterized in that: comprises inorganic modified soil, an organic polymer monomer mixed system, an excitation system and water.
2. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 1, wherein: the inorganic modified soil consists of polyoxyethylene modified sodium bentonite, wherein the polyoxyethylene content is 0.01-3%, the molecular weight of the polyoxyethylene is one or more of 1 ten thousand to 500 ten thousand, and the sodium bentonite content is 0.5-20%, based on the total weight of ingredients in the preparation of the organic-inorganic composite polymer.
3. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 1, wherein: the organic polymer monomer mixed system consists of acrylamide, acrylate and 2-acrylamide-methyl propane sulfonate.
4. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 3, wherein: acrylic acid, 2-acrylamido-methylpropanesulfonic acid and sodium hydroxide, potassium hydroxide or lithium hydroxide are adopted for neutralization reaction of the acrylic acid and the 2-acrylamido-methylpropanesulfonic acid to generate sodium acrylate, 2-acrylamido-methylpropanesulfonic acid sodium salt, potassium acrylate, 2-acrylamido-methylpropanesulfonic acid potassium or lithium acrylate and 2-acrylamido-methylpropanesulfonic acid lithium, wherein the acrylamide content is 5-30%, the acrylic acid content is 1-12%, and the 2-acrylamido-methylpropanesulfonic acid content is 0.5-10%, based on the total weight of ingredients in the preparation of the organic-inorganic composite polymer.
5. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 1, wherein: the excitation system consists of persulfate and sulfite, wherein the persulfate is one or more of sodium acid salt, potassium salt and ammonium salt, and the sulfite is one or more of sodium acid salt, potassium salt and ammonium salt.
6. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 5, wherein: the persulfate is one or more of sodium persulfate, ammonium persulfate and potassium persulfate, and the sulfite is one or more of sodium sulfite, potassium sulfite and ammonium sulfite.
7. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 6, wherein: potassium persulfate and sodium sulfite or ammonium persulfate and sodium sulfite form an excitation system.
8. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 5 or 6, wherein: the content of the persulfate is 0.01-2 percent, and the content of the sulfite is 0.01-1 percent, based on the total weight of the ingredients when preparing the organic-inorganic composite polymer.
9. The organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid according to claim 1, wherein: the water is deionized water or distilled water, and the content of the water is the residual amount of inorganic modified soil, an organic polymer monomer mixed system and an excitation system removed from the total weight of ingredients in the preparation of the organic-inorganic composite polymer.
10. The preparation method of the organic-inorganic composite polymer for improving the shear force of the water-based drilling fluid is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: preparing inorganic modified soil: dispersing sodium bentonite in deionized water under the condition of high-speed stirring, adding polyoxyethylene after the sodium bentonite is fully dispersed, stirring at a low speed for more than 4 hours at a temperature of 70 ℃, drying at a temperature of not higher than 110 ℃ to obtain inorganic modified soil, and crushing into powder by using a crusher;
step two: organic polymer monomer mixed solution: dissolving acrylic acid and 2-acrylamido-methylpropanesulfonic acid in water, adjusting the pH value to 6-7 by adopting sodium hydroxide, potassium hydroxide or lithium hydroxide, neutralizing to generate a mixed solution of sodium acrylate and 2-acrylamido-methylpropanesulfonic acid sodium, a mixed solution of potassium acrylate and 2-acrylamido-methylpropanesulfonic acid potassium or a mixed solution of lithium acrylate and 2-acrylamido-methylpropanesulfonic acid lithium, and adding acrylamide to dissolve to form an organic polymer monomer mixed solution;
step three: adding the prepared organic polymer monomer mixed solution into the prepared inorganic modified soil, completely dispersing the inorganic modified soil in the organic polymer monomer mixed solution, heating to 50-60 ℃, introducing nitrogen to remove oxygen in the solution, adding an excitation system consisting of persulfate and sulfite under the protection of nitrogen, stirring at a low speed for reaction for 5-6 hours under the protection of nitrogen, drying at the temperature of not higher than 100 ℃ to obtain the organic-inorganic composite polymer, and crushing into powder by using a crusher.
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