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营8断块位于东辛油田东营构造北翼,截至2010年底,共钻井297口,其中套损井达到92口,套损率接近1/3。研究表明,营8断块断层发育,断裂系统复杂,套管损坏现象严重。通过分析,注水引发的断层滑移、油层附近泥岩蠕变膨胀、地层水和注入水的腐蚀和射孔,是导致其套损的主控因素。提出了延缓断层处套损的合理井身结构,并根据营8断块特点,建立了防止断层滑移的极限孔隙压力图版和泥岩夹层中下入套管的强度图版;针对该断块地层水和注入水腐蚀性强、水泥浆返高低的实际情况,提出在后续注水作业中控制注入水水质,并要求新钻井提高水泥浆返高至表层套管以上50m;提高射孔段套管强度方面,提出在油层段局部采用钢级P110、壁厚为10.54mm的套管。制定套损的预防措施要有针对性,要结合油田的实际地质特点,以控制诱发套损的主要因素为目标,实现套损预防措施从定性到定量化的转变。
The block 8 of Yingying is located in the north wing of Dongying structure of Dongxin Oilfield. By the end of 2010, a total of 297 wells were drilled, of which 92 wells were damaged and the rate of casing loss was close to 1/3. The research shows that the fault of Ying 8 fault block develops, the fracture system is complex, and the casing damage is serious. Through analysis, fault slip caused by water injection, creep expansion of mudstone near the reservoir, corrosion and perforation of formation water and injected water are the main controlling factors leading to casing damage. Based on the characteristics of Ying 8 fault block, a set of limit pore pressure plate to prevent the fault slippage and the strength plate of middle and lower casing of mudstone interlayer were established. According to the formation water of the fault block And injected into the water corrosive, return to the actual situation of the cement slurry, put forward in the follow-up water injection water quality control, and requested a new drilling to raise the slurry back to the surface of the casing above 50m; improve the perforating casing strength , Proposed in the reservoir section of the local use of steel grade P110, wall thickness of 10.54mm casing. Preventive measures should be targeted to develop a set of damage, combined with the actual geological characteristics of the oil field, to control the main factors that lead to casing damage as the goal, to achieve qualitative change to quantitative measures to prevent damage.