Abstract: A high temperature and high salinity-resistant complementarily rigid-flexible plugging agent, a method for preparing the same, and a water-based drilling fluid and a use thereof.

Abstract: A high temperature and high salinity-resistant complementarily rigid-flexible plugging agent, a method for preparing the same, and a water-based drilling fluid and a use thereof.

Abstract: A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor is obtained by performing hydrophobic modification for nano-particles through long-chain organosilicon together with a surface-active agent. A preparation method of the said hydrophobic shale surface hydration inhibitor comprises steps as follows: nano-particles are added to the solvent under stirring conditions, and then an ultrasonic dispersion is performed; upon the end of the ultrasonic dispersion, the reaction system is adjusted to a pH of 9-11 to obtain mixed solution A; a long-chain organosilicon solution is then dropwise added to the mixed solution A for reaction under stirring conditions to obtain mixed solution B; a surface-active agent is added to the mixed solution B for reaction under stirring conditions; upon the reaction is finished, part of the solvent is removed to obtain the inhibitor.

Abstract: An oil-soluble thermosensitive resin lost circulation material for protecting a reservoir includes the following raw materials in parts by weight: 40-60 parts of resin matrix, 15-40 parts of modified asphalt, 5-12 parts of viscosity modifier, 2-5 parts of cross-linking agent, 6-15 parts of softening point modifier, and 1-3 parts of dispersant; it further provides a method for preparing the resin lost circulation material; the resin lost circulation material can melt and adhere in different temperature ranges, rapid plugging is realized, and the plugging time is long; the oil-soluble thermosensitive resin lost circulation material can be dissolved by oil flow during oil well production, so that the reservoir permeability is recovered, so as to achieve the purpose of protecting the hydrocarbon reservoir.

Abstract: The present disclosure to a cementitious plugging wall solidifier for water-based drilling fluid and a preparation method thereof and a water-based drilling fluid.

Abstract: The present disclosure relates to the technical field of oilfield chemistry. A flocculating agent for removing oil-based drilling fluid rock cuttings and a preparation method and a use thereof.

Abstract: The present discloses a water-based gel-consolidation type lost circulation material system suitable for fractured lost circulation formation, preparation method and use thereof.

Abstract: A high-temperature resistant, high-strength, and thixotropic gel plugging agent is composed of 8-20% of acrylamide monomer, 0.05-0.5% of reactive polymer, 0.1-1.0% of organic polymer cross-linker, 3.0-8.0% of resin toughening agent, 1.0-5.0% of flow pattern regulator, 0.01-0.5% of cross-linking regulator by the weight in the water. The gel solution shows a low apparent viscosity during the shear flow and is easy to be pumped into the wellbore and then into the formation leakage layer; after the pumping stops, the gel solution shows rapidly increased viscosity and strong adhesive force, and form a high-strength barrier between the wellbore and the formation, preventing the drilling fluid from further leaking.

Abstract: A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor is obtained by performing hydrophobic modification for nano-particles through long-chain organosilicon together with a surface-active agent. A preparation method of the said hydrophobic shale surface hydration inhibitor comprises steps as follows: nano-particles are added to the solvent under stirring conditions, and then an ultrasonic dispersion is performed; upon the end of the ultrasonic dispersion, the reaction system is adjusted to a pH of 9-11 to obtain mixed solution A; a long-chain organosilicon solution is then dropwise added to the mixed solution A for reaction under stirring conditions to obtain mixed solution B; a surface-active agent is added to the mixed solution B for reaction under stirring conditions; upon the reaction is finished, part of the solvent is removed to obtain the inhibitor.

Abstract: The invention relates to a dynamic fracture width calculation method for drilling fluid loss in a fractured formation, which belongs to the field of loss control of drilling and well completion engineering, and includes the following steps: selecting a model according to seismic data and fracture development characteristics and calculating a static hydraulic width of a formation fracture; substituting the static hydraulic width of the formation fracture into a deformation formula of a fracture hydraulic width, to obtain a dynamic hydraulic width of a wellbore fracture; converting the dynamic hydraulic width of the wellbore fracture into an average mechanical width of the wellbore fracture, according to a conversion relational formula of a mechanical width; and solving a mechanical width distribution range of the fracture according to a standard deviation of a mechanical width distribution of a natural fracture.

Abstract: A high temperature-resistant and high oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and its preparation method is prepared from raw materials in parts by mass as follows: 15-30 parts of reaction monomers, 5-12 parts of linear high polymers, 0.1-1.5 parts of cross-linking agents, 0.1-0.5 parts of initiators, 1-3 parts of modified starches, 1-5 parts of filler particles and 1-5 parts of dispersing agents; it has high oil absorption capacity under a high-temperature condition and high toughness after oil-absorbing expansion.

Abstract: The invention relates to a dynamic fracture width calculation method for drilling fluid loss in a fractured formation, which belongs to the field of loss control of drilling and well completion engineering, and includes the following steps: selecting a model according to seismic data and fracture development characteristics and calculating a static hydraulic width of a formation fracture; substituting the static hydraulic width of the formation fracture into a deformation formula of a fracture hydraulic width, to obtain a dynamic hydraulic width of a wellbore fracture; converting the dynamic hydraulic width of the wellbore fracture into an average mechanical width of the wellbore fracture, according to a conversion relational formula of a mechanical width; and solving a mechanical width distribution range of the fracture according to a standard deviation of a mechanical width distribution of a natural fracture.

Abstract: The present disclosure provides a preparation method of an environment-friendly high-temperature resistant water-based drilling fluid plugging anti-sloughing agent, the preparation method comprises the following steps: mixing and emulsifying a styrene monomer, an acrylic monomer and an emulsifier MS-1 aqueous solution to prepare a pre-polymerization emulsion; dispersing hydrophilic monomer, cationic monomer and an emulsifier MS-1 in water, adjusting the pH to be within a range of 6.5-8.

Abstract: The present disclosure provides a preparation method of an environment-friendly high-temperature resistant water-based drilling fluid plugging anti-sloughing agent, the preparation method comprises the following steps: mixing and emulsifying a styrene monomer, an acrylic monomer and an emulsifier MS-1 aqueous solution to prepare a pre-polymerization emulsion; dispersing hydrophilic monomer, cationic monomer and an emulsifier MS-1 in water, adjusting the pH to be within a range of 6.5-8.

Abstract: The invention presents a high temperature-resistant and high oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and its preparation method, wherein the plugging agent is prepared from raw materials in parts by mass as follows: 15-30 parts of reaction monomers, 5-12 parts of linear high polymers, 0.1-1.5 parts of cross-linking agents, 0.1-0.5 parts of initiators, 1-3 parts of modified starches, 1-5 parts of filler particles and 1-5 parts of dispersing agents. The resin particle plugging agent presented in the invention not only has high oil absorption capacity under a high-temperature condition, but also has high toughness after oil-absorbing expansion. It is not easy to break by extrusion and stretching and can effectively plug a high-temperature leakage passage. Also, the resin plugging particles in it will not be affected by crack factors.

Abstract: The invention provides a high-temperature resistant, high-strength, and thixotropic gel plugging agent and its preparation method and application. The said gel plugging agent is composed of raw materials in the following mass percent: 8-20% acrylamide monomer, 0.05-0.5% reactive polymer, 0.1-1.0% organic polymer cross-linker, 3.0-8.0% resin toughening agent, 1.0-5.0% flow pattern regulator, 0.01-0.5% cross-linking regulator, and water in the remaining percentage.