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.

Abstract: The invention relates to the field of drilling fluid, and provides a multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof, wherein the multi-functional weighting agent is an polyacrylamide/modified barium sulfate composite multi-functional weighting agent prepared by sequentially dropwise adding acrylamide and ammonium persulfate to a mixture of modified barium sulfate and deionized water in a presence of an initiator.

Abstract: The present disclosure relates to a high-temperature retarder suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry.

Abstract: The invention relates to the field of drilling fluid, and provides a multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof, wherein the multi-functional weighting agent is an polyacrylamide/modified barium sulfate composite multi-functional weighting agent prepared by sequentially dropwise adding acrylamide and ammonium persulfate to a mixture of modified barium sulfate and deionized water in a presence of an initiator.

Abstract: The present disclosure relates to a high-temperature retarder suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry.

Abstract: The present invention relates to the technical field of well drilling, and discloses a temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and a use thereof. The water-based drilling fluid contains a filtrate reducer and a plugging agent, wherein the filtrate reducer is a copolymer that contains structural units represented by formula (1), structural units represented by formula (2), and structural units represented by formula (3), wherein, the mass ratio of the structural units represented by formula (1) to the structural units represented by formula (2) to the structural units represented by formula (3) is (0.1-0.2):1:(0.05-0.1), and the number-average molecular weight of the copolymer is 10,000-100,000, the plugging agent is acrylamide-diallyldimethylammonium chloride copolymer modified graphene.

Abstract: The invention relates to the field of drilling fluid, and discloses a strong plugging drilling fluid composition and preparation method thereof, and use thereof. The strong plugging drilling fluid composition comprises water, bentonite, Na2CO3, a shale inhibitor, a filtrate reducer, a viscosity reducer, an anti-collapse agent, a nanometer plugging agent, a lubricant and a weighting agent. The shale inhibitor is modified asphalt, the anti-collapse agent is ultra-fine calcium carbonate, and the nanometer plugging agent is polyethylene glycol surface-modified nano-graphene.

Abstract: An expandable plugging agent is described. The expandable plugging agent is obtained through a polymerization reaction of acrylamide, a strength improving material, an acrylate, and gelatinized colloid, the acrylate is obtained through a neutralization reaction of an acidity neutralizer and acrylic acid, and the gelatinized colloid is obtained through a gelatinization reaction of starch in deionized water.

Abstract: The present invention relates to the technical field of petroleum drilling, and discloses a water-based drilling fluid for protecting fractured reservoirs and preparation method and use thereof. The drilling fluid includes: bentonite, a tackifier, a diluent, a filtrate reducer, an anti-collapse agent, a reservoir protectant composition, a lubricant, and water, wherein, the reservoir protectant composition comprises at least one of a polymer elastic granule, a synthetic fiber and a film former; the polymer elastic granule comprises an intermediate product, an alkali, a salt, and water in specific contents; the intermediate product is prepared from raw materials including acrylamide, a cationic monomer, a cross-linker, an initiator, a toughener, and water in specific contents. The drilling fluid provided in the present invention has a temperature-resistant property up to 200° C.

Abstract: The present invention relates to the well drilling field in petrochemical industry, in particular to use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid. The dual-cation fluorocarbon surfactant is a dual-cation fluorocarbon surfactant of which the cation part is represented by the following formula (1). The dual-cation fluorocarbon surfactant of the present invention can serve as wettability reversal agent when it is used for oil-gas drilling to enable rock amphiphobic, and is an amphiphobic wettability reversal agent which can cause rock surface to be non-hydrophilic and non-lipophilic. Using of dual-cation fluorocarbon surfactant, especially when drilling highly hydrous mud shale, can avoid permeation of water and oil into the rock effectively and thereby a capillary phenomenon can be prevented, and an effect of stabilizing the well wall and protecting the reservoir is attained.

Abstract: The present invention discloses a micro-nano composite plugging agent for drilling fluid, a preparation method of the micro-nano composite plugging agent for drilling fluid, a drilling fluid, and an application thereof. The composite plugging agent contains nanometer calcium carbonate, nanometer zinc oxide whiskers, nanometer emulsified paraffin, a flocculating agent, and a lubricant, wherein in the composite plugging agent, the nanometer calcium carbonate is in 10-36 parts by weight, the nanometer zinc oxide whiskers are in 20-40 parts by weight, the nanometer emulsified paraffin is in 30-70 parts by weight, the flocculating agent is in 1-10 parts by weight, and the lubricant is 5-20 parts by weight.

Abstract: A super-amphiphobic composite material and use of the same as an inhibitor, lubricant, reservoir protectant, and accelerator in water-based drilling fluids. A method for preparing the amphiphobic composite material includes: performing a first mixing of nano-titanium dioxide and nano-silicon dioxide in an alcohol-water mixed solvent under an alkaline condition, to obtain a dispersion of nano-titanium dioxide and nano-silicon dioxide; then introducing a fluorosilicone-containing coupler into the dispersion of nano-titanium dioxide and nano-silicon dioxide and performing a second mixing. The amphiphobic composite material may be applied in water-based drilling fluids. It has an effect of strongly inhibiting hydrated swelling and disintegration, low toxicity and high compatibility; can solve problems such as well wall instability, blockage of drilling tools, and reservoir damage, etc.

Abstract: Disclosed herein are water-based drilling fluids for protecting high-permeability reservoirs. The drilling fluid comprises bentonite, a tackifier, a thinner, a filtrate reducer, an anti-collapse agent, a reservoir protectant, a lubricant, and water.

Abstract: Disclosed herein are water-based drilling fluids for protecting high-permeability reservoirs. The drilling fluid comprises bentonite, a tackifier, a thinner, a filtrate reducer, an anti-collapse agent, a reservoir protectant, a lubricant, and water.

Abstract: The present invention relates to the technical field of petroleum drilling, and discloses a water-based drilling fluid for protecting fractured reservoirs and preparation method and use thereof. The drilling fluid includes: bentonite, a tackifier, a diluent, a filtrate reducer, an anti-collapse agent, a reservoir protectant composition, a lubricant, and water, wherein, the reservoir protectant composition comprises at least one of a polymer elastic granule, a synthetic fiber and a film former; the polymer elastic granule comprises an intermediate product, an alkali, a salt, and water in specific contents; the intermediate product is prepared from raw materials including acrylamide, a cationic monomer, a cross-linker, an initiator, a toughener, and water in specific contents. The drilling fluid provided in the present invention has a temperature-resistant property up to 200° C.

Abstract: The present invention relates to the well drilling field in petrochemical industry, in particular to use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid. The dual-cation fluorocarbon surfactant is a dual-cation fluorocarbon surfactant of which the cation part is represented by the following formula (1). The dual-cation fluorocarbon surfactant of the present invention can serve as wettability reversal agent when it is used for oil-gas drilling to enable rock amphiphobic, and is an amphiphobic wettability reversal agent which can cause rock surface to be non-hydrophilic and non-lipophilic. Using of dual-cation fluorocarbon surfactant, especially when drilling highly hydrous mud shale, can avoid permeation of water and oil into the rock effectively and thereby a capillary phenomenon can be prevented, and an effect of stabilizing the well wall and protecting the reservoir is attained.

Abstract: The present invention relates to the technical field of petroleum drilling, discloses a reservoir protecting agent composition for reservoir with cracks, a drilling fluid containing the same and use thereof. The reservoir protecting agent composition contains an elastic polymer particle, and at least one of a synthetic fiber and a film-forming agent; the elastic polymer particle contains an intermediate product, base, salt and water with specific amounts; and the intermediate product is made of raw materials comprising acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water with specific amounts. The reservoir protecting agent composition of the present invention can effectively prevent the drilling fluid from invading the reservoir with cracks, and rapidly block off cracks in the reservoir with cracks.

Abstract: The present invention relates to the technical field of petroleum drilling. An intermediate product of a reservoir protecting agent, a reservoir protecting agent, a preparing method and use thereof, a drilling fluid and use thereof are disclosed. The intermediate product of a reservoir protecting agent is made of raw materials comprising acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water, and based on the raw materials of 100 parts by weight, the use amounts of the acrylamide, the cationic monomer, the cross-linking agent, the initiator and the toughening material are respectively 8-30, 1-10, 0.01-0.5, 0.01-0.1, 5-25 parts by weight. The reservoir protecting agent includes the intermediate product of the present invention, base, salt, and water, and based on the reservoir protecting agent of 100 parts by weight, the use amounts of the intermediate product, base, and salt are respectively 5-40, 1-10, and 1-12 parts by weight.

Abstract: The present invention relates to the petroleum drilling field and discloses a nanometer film structured reservoir protecting agent, a drilling fluid containing the same and use thereof in low-permeability reservoirs. The structured nanometer film reservoir protecting agent comprises montmorillonite laminas, structural units represented by formula (1) and structural units represented by formula (2), wherein each of R1, R2, R3, R4 and R5 is independently selected from H, C1-C4 alkyl and C1-C4 alkoxy, R6 is alkylene of C1-C6. The drilling fluid containing the structured nanometer film reservoir protecting agent of the present invention exhibits favorable rheology property, temperature-tolerant property, anti-collapse property and reservoir protection property when used for drilling in low-permeability reservoirs.