The technical advance and development suggestions for leakage prevention and plugging technologies in Permian of Shunbei Oilfield
In order to solve the problem of serious leakage in the process of Permian drilling,the Permian strata characteristics,leakage type and crack width,reveals the cause of the Permian leakage has been analyzed,summarizes the field leakage technology development process and the technical achievements,and the current problems give the technical advice.The analysis showed that the fragmentation of Permian strata,the development of multi-scale complex cracks,the low leakage pressure and the sensitivity to well bore pressure.In view of the leakage of Permian system,four stages of leakages formed,included plugging on every leakage,avoiding pressure,collapse and leakage of the loss of control at the same time,optimization and improvement,forming technologies such as leakage prevention,bridge plugging,leakage,gel leakage,chemical consolidation and whole well leakage.Since 2018,more than 20 Wells have been applied,such as SHBP 1 and SHBY 1.Among them,the average leakage amount of a single well decreased from 508 m3 before 2017 to 138 m3(72.8％reduced)in 2020,and the leakage time decreased from 9.3 d before 2017 to 2.6 d(72％reduction)in 2020,which achieved certain field application effect.Through analysis and sorting,the current situation of leakage prevention technology and still leakage problems in Shunbei Oilfield are clarified,the key direction is determined,and we put forward the technical development suggestions of strengthening stratum prediction,research and development or introducing new leakage plugging technology,enriching engineering technical means and developing big data plugging software.
万方数据
维普
