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塔河油田属于碳酸盐岩缝洞型油藏,开发难度大。在开发过程中,套管的变形、损坏时有发生,直接影响着油井的正常运转和生产。为找到套管损坏的规律和根本原因,对塔河油田440口高含H2S(95%井H2S超过20mg/L,平均1500mg/L)的掺稀超深生产井(5500~7100m)10年来的套管损坏情况进行了分析。分析结论认为塔河油田超深井套损的发生主要受井超深应力变化、裸眼上段的泥质岩、完井套管材质适应性差、地层改造强度高、生产压差大、套管悬挂器和套管接箍等因素影响。由于受井深限制,出现套损后,套管补贴难度大,普通的挤堵修套有效期短,因此超深井的套管损坏应以预防为主。预防套管损环的主要措施应以提高钻井技术、固井质量为基础,以取准地应力变化趋势、制定合理的注水、生产压差为手段,以研制抗高温、高H2S、高矿物质及超高强度抗挤毁的非API套管为攻克点,全面提高套管抗损坏能力。
Tahe Oilfield belongs to the carbonate rock fractured-hole reservoir, which is difficult to develop. During the development process, casing deformation and damage sometimes occur, which directly affects the normal operation and production of the well. In order to find out the regularity and the root cause of casing damage, 440 wells of Tahe oilfield with high H2S (95% H2S over 20mg / L, average 1500mg / L) sparsely doped ultra-deep production well (5500 ~ 7100m) Casing damage was analyzed. The analysis concluded that the occurrence of ultra-deep casing damage in Tahe Oilfield is mainly affected by the ultra-deep stress of the well, the poor adaptability of argillaceous rock and completion casing material in the upper part of the open hole, high strata reformation strength, large production pressure difference, casing hanger and Casing coupling and other factors. Due to the limitation of the well depth, after the casing damage occurs, the casing subsidy is very difficult, and the ordinary crowding-out repair casing has a short effective period. Therefore, the casing damage of the ultra-deep well should be mainly prevention. The main measures to prevent casing ring damage should be to improve drilling technology, cementing quality as the basis, to take the trend of changes in in situ stress, to develop a reasonable water injection, production pressure as a means to develop high temperature, high H2S, high mineral And ultra-high-strength anti-collapse of the non-API casing to overcome the point, to improve the overall resistance to damage casing.