9results about How to "Good settlement stability" patented technology

This invention discloses a high-temperature resistant, high-density water-based drilling fluid for ultra-deep wells and its preparation method, belonging to the field of oil and gas drilling technology. The drilling fluid is composed of the following components in parts by weight: 100 parts water, 2-5 parts high-temperature resistant modified clay, 150-280 parts composite weighting agent, 8-15 parts high-temperature resistant polymer filtration loss reducer, 3-8 parts core-shell type high-temperature resistant flow modifier, 4-10 parts nano-composite plugging agent, and 2-5 parts high-temperature stabilizer. This invention effectively solves the technical problems of rheological runaway, increased filtration loss, and barite sedimentation in ultra-deep well high-density water-based drilling fluids under high-temperature conditions above 220℃ by utilizing the high-temperature expansion-disintegration mechanism of the core-shell type flow modifier, nano- to micron-level multi-stage plugging, and the close packing of spherical and irregular weighting materials. It exhibits temperature resistance up to 220℃ and a density of 2.80 g / cm³. 3 It has the advantages of low filtration loss under high temperature and high pressure and good sedimentation stability.

The invention provides well cementation cement paste as well as a preparation method and application thereof. The well cementation cement paste comprises oil well cement, an active material, hollow glass microspheres, a corrosion-resistant material, a tough material, a suspending agent, a dispersing agent, a fluid loss agent, a retarder, a defoaming agent and water, the density of the well cementation cement slurry is 1.2 to 1.6 g / cm < 3 >. The preparation method comprises the following steps: (1) mixing oil well cement, an active material, hollow glass microspheres, a corrosion-resistant material, a tough material, a suspending agent, a dispersing agent and a fluid loss agent to obtain a dry mixture; (2) mixing a retarder, a defoaming agent and water to obtain wet mixed liquid medicine; and (3) mixing the dry mixed material and the wet mixed liquid medicine to obtain the well cementation cement slurry. The well cementation cement paste provided by the invention realizes high-quality rapid well building, ensures long-term sealing integrity of a cement sheath, and provides powerful technical support for large-scale exploration and development of high-sulfur-content natural gas wells and CCUS wells and reduction of wellhead gas blow-by and annulus pressure risks.

The application provides a high-density water-based completion fluid resistant to carbon dioxide pollution, which is composed of the following components in mass fraction: 100 parts of bentonite slurry, 0.4-0.6 parts of sodium hydroxide, 5-10 parts of filtrate reducer A, 10-15 parts of filtrate reducer B, 2-3 parts of acid gas complexing agent and weighting agent. 3 The density of the completion fluid is 2.00g / cm 3 ~2.50g / cm The completion fluid has good sedimentation stability and rheological property after being kept at 150 DEG C for 10 days, and can meet the needs of field construction; meanwhile, the completion fluid is resistant to temperature of 150 DEG C-170 DEG C, and solves the problem that the performance of the existing high-density water-based completion fluid is out of control after being polluted by carbon dioxide under high-temperature conditions.

The invention relates to the technical field of oil and gas well cementation engineering, in particular to oil, gas and water invasion resistant cement paste suitable for well cementation of an adjusting well, and the cement paste provided by the invention comprises the following components in parts by mass: 100 parts of cement, 1.5-2.5 parts of a fluid loss agent, 0.2-1.0 part of a drag reducer, 38-46 parts of distilled water and 0.2-0.5 part of a flocculating agent, the self-healing agent comprises the following components in parts by mass: 2-5 parts of a capillary crystalline self-healing agent, 5-7 parts of an oil-encountering self-healing agent, 10-12 parts of a gas-encountering self-healing agent, 0.1-0.3 part of a retarder, 2-4 parts of an expanding agent and 0.1-0.5 part of a defoaming agent. The cement paste provided by the invention is good in settling stability, set cement has the characteristics of micro-expansion, high strength, low elastic modulus, gas channeling prevention, oil gas and water invasion resistance, self-healing when meeting water and the like, and the phenomenon of well cementation quality tip falling caused by oil gas and water channeling after well cementation of an adjusting well and the phenomena of micro cracks, micro annular gaps, even rupture and the like of a cement sheath can be avoided; good interlayer packing is achieved, and technical support is provided for long-term, safe and effective operation of oil and gas wells.

The invention provides high-density cement paste as well as a preparation method and application thereof. The high-density cement paste disclosed by the invention is prepared from the following components in parts by mass: 2 to 4 parts of dispersing agent PC-F45L, 1.2 to 1.5 parts of retarder PC-H40L, 5.5 to 6 parts of fluid loss agent PC-G80L, 0.5 to 1 part of defoaming agent, 38 to 42 parts of weighting agent, 98 to 102 parts of cement and 220 to 246 parts of water. The dispersing agent, the retarder and the fluid loss agent are specifically selected and compounded with other components, so that the obtained high-density cement paste cannot be thickened too early (the thickening time exceeds 400 minutes) in the grouting process, has better strength, sedimentation stability, rheological property and filtration loss property, and can well improve the well cementation quality.

The invention provides a tracer agent and application thereof in shale oil and gas exploration and development, the tracer agent comprises a rare earth element compound, a composite complexing agent and a compatible additive, and the composite complexing agent comprises a phenanthroline compound and ethylenediamine tetraacetic acid. The tracer agent has high rare earth element retention rate, good compatibility with fracturing fluid, good high temperature performance, safety and environmental protection performance, is more suitable for shale stratums, can still continuously and effectively play a monitoring role in the environment with the dual dilution effect of the fracturing fluid and stratum fluid, and has the advantages of being capable of improving the sedimentation stability of the propping agent in the fracturing fluid, good in high temperature performance and good in safety and environmental protection performance. The current shale oil-gas exploration and development technical requirements are met.

The invention provides a myriameter deep ground oil-gas lubrication resistance-reducing water-based drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The oil-gas lubrication resistance-reducing type water-based drilling fluid for the 10000-meter deep ground comprises the following raw materials in parts by weight: 100 parts of water, 5-10 parts of light diesel oil, 1-4 parts of high-temperature-resistant clay, 3-6 parts of a dendritic macromolecular filtrate reducer, 2-4 parts of a temperature response micelle shear strength improving agent, 2-4 parts of a high-temperature-resistant strong-adsorption blocking agent, 3-5 parts of a nano composite polymer brush lubricant and 1-3 parts of a high-temperature-resistant system stabilizer. According to the invention, the filtrate reducer, the shear strength improving agent, the plugging agent, the lubricant and other components cooperate with each other to achieve synergistic interaction, so that the drilling fluid has low viscosity and good lubricating property and sedimentation stability under the conditions of 240 DEG C, saturated salt and high density, and can increase the mechanical drilling speed, slow down the wear of a drill bit, reduce drilling accidents such as differential pressure jamming and the like; and the drilling time and the total cost of a myriameter-deep oil-gas well are reduced.

The application relates to a preparation method of an ultra-high-temperature fluid loss additive for well cementing, and belongs to the technical field of oilfield chemicals. After surface modification of palygorskite by a silane coupling agent, the surface polymerization sites of the palygorskite are obtained, so as to participate in a polymerization reaction. N,N-dimethyl acrylamide and other non-ionic water-soluble monomers, 2-acrylamide-2-methylpropanesulfonic acid, itaconic acid, sodium styrene sulfonate and other anionic water-soluble monomers, and vinyl pyrrolidone, sodium p-styrene sulfonate and other rigid monomers are used as polymerization raw materials to synthesize polymer grafted palygorskite. The fluid loss additive has excellent temperature resistance and salt resistance, has excellent fluid loss performance in a high-temperature and ultra-high-temperature environment, the fluid loss amount is less than 50 mL at 240 DEG C, has no obvious influence on other basic performances of cement slurry, can effectively improve the suspension stability of the cement slurry at high temperature, and is suitable for being used as a fluid loss additive for cement slurry under harsh conditions.

The invention discloses a suspension stable type powder fluid loss agent and a preparation method thereof. The fluid loss agent is a compound of a polymer system and a performance additive, the polymer system is formed by copolymerizing a monomer A, a monomer B and a monomer C in a reaction system containing layered silicate clay; the monomer A is 2-acrylamido-2-sodium methyl propanesulfonate, sodium p-styrenesulfonate or 3-allyloxy-2-hydroxy-1-sodium propanesulfonate, and the monomer B is a monomer C; the monomer B is 4-acryloyl morpholine, N, N-dimethylacrylamide or N, N-diethyl acrylamide; the monomer C is methacrylic acid, maleic acid, butenoic acid or fumaric acid; the modification auxiliary agents comprise a modification auxiliary agent A, a modification auxiliary agent B and a modification auxiliary agent C; the performance additive A is welan gum and / or dimer gum; the performance additive B is sulfonated phenolic resin and / or hectorite powder, and the performance additive C is at least one of limestone powder, dolomite powder and pickled quartz sand; the preparation method of the fluid loss agent is simple, the sedimentation stability of cement paste is effectively improved, the fluid loss agent can resist the temperature of 240 DEG C, and the API fluid loss is small.