The Research on Workover Technology of High Wax Content Heavy Oil in Jin Xian 1-1 Oilfield

The crude oil of Jinxian 1-1 oilfield mainly includes heavy oil and medium-light oil. The recombinant deposition of heavy crude oil and the wax deposition of medium light crude oil will lead to the blockage of well bore or stratum and seriously affect the normal production of oil wells. In order to solve the problem of organic scale blocking in Jinxian 1-1 oilfield, a series of key technologies, such as dewaxing technology of hot-washing steel wire/continuous tubing, special workover fluid for Jinxian 1-1 and hollow rod electric heating pipe string technology were gradually discovered, which effectively improved the workover efficiency of this block and restored the normal productivity of oil well. From 2013 to 2018, these key technologies had been successfully applied in Jinxian 1-1 oilfield. The application results show that the input and output ratio of thermal washing technology reaches 1:8.9. The application of three kinds of technologies can save the cost of workover by about 11 million yuan, and the economic benefit is remarkable. The successful application of these key technologies in Jinxian 1-1 oilfield provides a reference for resolving the blockage problem of recombinant in bohai oilfield, and also affords us practical guidance for the development and production of heavy oil blocks.