Drillable Plugging Technology Research

At present, Shengtuo oilfield has entered the later stage of high water cut development, the use of packer sealing adjustment layer measures are more frequent, but due to casing damage wells increased year by year, the conventional casing plugging and packer process adaptability sealing technology on well complex hole condition variation, in the work Shui Naka performed as sealing process repeated rework, short duration, low reliability. Multi point leakage, long serious corrosion, reducing casing leakage coexisting difficult to govern well increasing, at home and abroad are mainly adopts sealing, small casing, casing patching technology governance of casing damage wells, and for inter well plugging large pressure difference validity period is short, effect. The casing damaged wells is serious, maintain normal production of oil well using small casing technology, to improve the utilization rate of oil wells has achieved a certain effect, compared to playing renewed well, construction is convenient, quick, but the high cost of construction, single well cost is high, due to the small casing steel, not the drill, the later subdivision of development wells, measures of difficulty. Casing is sealed by and is used in rubber, if the seal casing corrosion pit sealing failure problem still exists. Plugging technology routine there are some inadaptability in Shengtuo oilfield, therefore, research on a tube sealing channeling, tube paste plugging, high reliability, long effective period, simple construction, convenient post-treatment drillable paste plugging technology, in order to provide effective measures to solve the hierarchical mining pipe leakage, casing set of Doubi. The technology is the paste plugging to the designated location, with high pressure between the tubing and casing injection plugging plugging agent, after the solidification of the paste plugging reinforcement in the casing, the paste plugging and cement plugging double barrier agent to seal the leak, the purpose of paragraph. Through the research on paste plugging pipe plugging, research and construction technology of agent, eventually formed a complete set of drillable paste plugging technology. Drillable paste plugging technology can effectively control card seal sand stuck pipe column sealing section of the casing, the development of corrosion damage, interlayer energy difference kcal packer string short effective period, facing casing segmental leakage and multi strata subdivision mining old oil field, at the same time drillable paste plugging technology technology supporting mature, later can restore casing well. In the field of promotion, card well sealing seal effective rate is increased obviously, has carried out on 396 wells of oil well plugging technology, the successful rate was 98%, well all the success and is still effective. Paste plugging the longest period of 1087 days, and achieved significant results, provide a good reference for other governance and high water content at the late stage of oilfield development difficult card Fui.