COMPOSITE PLUG REMOVEL TECHNOLOGY IN SHALLOW AND LOW TEMPERATURE FORMATION IN YUMEN OILFIELD

Aim at the increasing complex mix plugging in shallow and low temperature field, the technology of composite plug removal, which has notability function on inorganic blockage and organic blockage, was successfully studied base on the sufficiency cognition of formation lithology character and its plugging machanism. With multi-organic component and additive compositive as pad fluid, retarded acid and fluorboric acid liquid as main liquid, the technology possess sand control function more than plug removal, which has been developed important technique in Laojunmiao Oilfield. Field testing indicate that this technology has lower cost, quicker action and higher stimulation effect. Four wells were done in 2000, which efficiency rate is 100% and increase production add up to 1024 t.