The Research Of Shale Gas Cementing Technology In Horizontal Well

Shale gas horizontal well cementing technology at home and abroad has always been one of the focuses of the oil industry a problem, but also restrict our country shale oil and gas exploration and development speed is one of the important reasons. Mostly for shale gas reservoir with low porosity and low permeability, need to take a lot of natural fracture fracturing stimulation such as connections, has been very high quality requirements of cementing. The shale gas horizontal well cementing is facing a series of technical problems,such as: casing running hard, moderately low, replace, such as low efficiency and poor cement ring play toughness.Therefore, this article through to the shale gas horizontal well cementing technology at home and abroad comprehensive research, the analysis on the key techniques of shale gas horizontal well cementing, begin from casing running and center control technology, improve the efficiency of displacement technology, solid slurry system and so on three aspects,explored the method to improve the cementing quality of shale gas horizontal well. Through a lot of research, can draw several conclusions: first, using the casing floating technology, and every 20 m alternate installation of flexible and rigid centralizer pipe string structure can improve the running of shale gas horizontal well casing and center ability; Second, oil-based preflush QZY can effectively improve the cementing displacement efficiency of shale gas horizontal well; Third, for suitable for shale gas horizontal well cementing low density foam cement slurry and the conventional density cement slurry system. According to the research,carried out the shale gas horizontal well cementing field application, and obtained the very good cementing effect.