57results about How to "Reduce friction coefficient" patented technology

The invention provides water-based drilling fluid for stabilizing shale. The drilling fluid is formed by mixing sodium-based bentonite, a shale inhibitor, a tackifier, a flow-pattern adjusting agent, a filtrate reducer, a high-temperature-resisting processing agent, a bridging agent, bridging particle and an anti-collapse agent. Calculated by the addition quantity in every 100 parts of water, the water-based drilling fluid comprises the following components in parts by mass: 5 parts of sodium-based bentonite, 1.5 to 1.8 parts of shale inhibitor, 0.5 to 0.7 part of tackifier, 0.1 to 0.2 part of flow-pattern adjusting agent, 0.7 to 0.9 part of filtrate reducer, 2.3 to 2.5 parts of high-temperature-resisting processing agent, 9.33 to 10.67 parts of bridging agent, 1.8 to 2.2 parts of bridging particle and 1.1 to 1.3 parts of anti-collapse agent. The drilling fluid is good in rheological property, filtrate reduction property and lubricating property and strong in inhabitation property, so that the requirement of the shale gas horizontal well drilling cuttings carrying and wall stability requirement can be met, and the probability of drilling seizure can be reduced.

The cation emulsified asphalt as collapse-preventing agent for well drilling fluid consists of asphalt 20-40wt%, potassium hydroxide 4-9 wt%, ammonium cetyl trimethyl chloride 1-3wt%, industrial assistant oil 15-30wt%, acrylic acid monomer 5-8wt%, deionized water 15-30wt%, dibenzoyl peroxide 0.1-0.2wt%, ammonium epoxypropyl trimethyl chloride 5-8wt% and sorbitan monooleate. The preparation process of the cation emulsified asphalt as collapse-preventing agent includes the steps of preparation of polymer emulsion, preparation of cation asphalt emulsion and compounding of polymer-cation asphalt emulsion. The collapse-preventing agent can be compounded well to cation polymer well drilling fluid to form stable well drilling fluid with obviously improved performance.

The invention relates to a temperature-resistance drilling fluid drill-feeding plugging agent and its preparation method, the drill-feeding plugging agent comprises the following components by weight: 30-80 parts of vegetable fiber, 10-40 parts of mineral fiber, 10-40 parts of fruit shell, 0-10 parts of powdered steatile, and 3-10 parts of silicon-based gel deformation particles. The silicon-based gel deformation particles enable emulsification and dispersion of 1.4-2.5 parts of vinyltriethoxysilane monomer according to weight to an aqueous solution composed of 18-24 parts of acrylamide, 0.0025-0.005 parts of N,N'-methylene bisacrylamide, 0.7-1.25 parts of OP-10 and 0.1-0.17 parts of sodium dodecyl benzene sulfonate, 0.003 parts of disodium ethylene diamine tetraacetate, 0.009-0.12 parts of ammonium persulfate and 0.009-0.012 parts of sodium bisulfate, a process of micellar copolymerization is carried out, a polymer is dried, granulated and crushed to obtain the silicon-based gel deformation particles with average particle size of 80-200 meshes; easy-leakage highly-permeable stratum and micro crack are effectively plugged, rheological parameter of the drilling fluid is not influenced, frictional resistance coefficient of the drilling fluid is reduced, a storage layer is protected, and the drill-feeding plugging agent is suitable for plugging the easy-leakage stratum and the storage layer.