Pingfangwang Oil Low Pressure And Leakage Of Well Cementing Slurry Optimization Research

At present, in the oil field cementing construction, low pressure and leakage well s due to bearing capacity lower stratigraphic some wells, prone to leakage, resultingto sealing purpose layer leaky seal, cement slurry into the oil and gas reservoirscaused se rious pollution, resulting in formation fluid outward channeling, unable to meet the pr oduction casing cementing of requirements, resulting in cementing the quality is not q ualified, seriously affected the normal oil production in the future.Cementing is a coll ection of multidisciplinary systems engineering, there are many factors influence, has its own particularity, different geological conditions of different oil of different blocks, the cementing requirements are also different,which created a diversified cementing t echnology and cement slurry system.Aiming at the difficulties in pingfangwang oilfield cementing technology in low pressure and leakage strata and the oil block, combined with early pingfangwang oilfi eld cementing the practical construction experience, in view of the characteristics of st rata pingfangwang Oilfield low pressure, lost circulation,through the optimization test of cement slurry system, and the practical applicationin the area of early in the cemen ting, the entire well cementing when, based on the use of low density of fly ash cemen t slurry system, optimize the choice of using lowdensity of fly ash cement slurry syste m in oil well according to the upper, lower oil-water layer of oil, severe water invasio n characteristics, the use of early strengthagent of cement, water swelling cement, plas tic fiber cement slurry system inreservoir. Based on the above, in order to develop and optimize a number ofschemes, and make a practical application, thus gradually optim ize the.This thesis use fly ash low density cement slurry system in early on, furtheroptim ization study, through continuous exploration and the actual construction site,the ulti mate success of formulate "cementing fly ash low density cement slurry and plastic fi ber water swellable early strength cement slurry system" to the oil fields of the block, very good to meet the requirements of cementing quality of construction design, has t he very high application significance, at the same time compared with the cement slur ry system can achieve the same other cementing construction quality, reduce the ceme nting construction cost, has the certain economicsignificance.