A method for controlling the performance of high-temperature and high-density water-based drilling fluid
A water-based drilling fluid, high-density technology, applied in the field of oil and natural gas exploration and development, can solve the problems of uncontrollable viscosity, large filtration loss at high temperature and high pressure, inability to balance rheology and suspension stability, etc. Control, small filtration loss at high temperature and high pressure, good rheology and suspension stability
Active Publication Date: 2021-01-01
CHINA PETROLEUM & CHEM CORP +1
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[0004] All the above studies are only carried out from the perspectives of the percentage of solid phase, the dispersion of solid phase particles, and the strength of the interaction between solid phase ions. The amount is large, and the rheology and suspension stability cannot be considered at the same time.
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[0029] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0030] Based on the Einstein theory, Hiemenz theory and Stokes settlement theory, the present invention studies the factors affecting the viscosity of the high-temperature, high-density, low-friction water-based drilling fluid system, and proposes a "seesaw" effect of the high-temperature, high-density water-based drilling fluid system, The relationship between factors affecting the viscosity of high-temperature and high-density water-based drilling fluids, and the "three lows and one thin" (low viscosity effect, low specific surface area, and low friction) for controlling good filtration loss, rheology, and suspension stability of high-temperature and high-density water-based drilling fluids , Thin solvation film) multi-factor synergistic control method, based on this method, the key treatment agents such as low-viscosity polymer fluid loss reducer and dispersant and ...
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Abstract
The invention provides a regulation method for the performance of high-temperature high-density water-base drilling fluid and belongs to the field of exploration and development of petroleum and natural gas. According to the method, by lowering the liquid-phase viscosity, frictional resistance, specific surface area and solvation film thickness, the high-density water-base drilling fluid has high-temperature resistance, pollution resistance, high rock carrying performance, high lubrication capacity and good rheological property. By using the method, the rheological property of the high-densitydrilling fluid is easily controlled at high temperature, the filter loss amount at high temperature and high pressure is low, the suspension stability is good, and the application effect is good.
Description
technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, and in particular relates to a method for regulating and controlling the performance of high-temperature and high-density water-based drilling fluid. Background technique [0002] During the drilling process of deep wells, ultra-deep wells or high-temperature and high-pressure formations, the bottomhole temperature is above 150°C or higher, and the bottomhole pressure coefficient is often above 2.0. The downhole high temperature environment seriously affects the performance of the drilling fluid, especially in the In salt formations, chemical agents fail in high-density drilling fluids at long-term high temperatures. Serious thickening or dilution of drilling fluids makes it difficult to control drilling fluid viscosity and high-temperature and high-pressure filtration. Heavy materials such as barite and cuttings settle, and cuttings repeatedly Breaking and oth...
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IPC IPC(8): C09K8/035C09K8/03C09K8/16C09K8/22C09K8/20C09K8/24
CPCC09K8/032C09K8/035C09K8/16C09K8/20C09K8/22C09K8/24C09K2208/28C09K2208/34
Inventor 曾义金林永学杨小华何伟国王琳
Owner CHINA PETROLEUM & CHEM CORP