精细控压钻井技术在滨104x1井试验与应用

滨104x1井是评价大港油田港东油田港17104区块西断块含油气情况的一口评价井,本井采用二开封固馆陶地层,而主力油气层沙一存在异常高压,东营组地压力系数低,三开同一个裸眼段存在多个高、低压同时存在的压力系数,常规钻井技术不能满足钻遇异常高压层后,需要提高钻井液密度,来平衡地层压力,而造成上部东营地层薄弱,产生下喷上漏的井下复杂,从而造成井控风险大,本井设计从3000m开始应用精细控压钻井技术,通过合理的压力控制,降低钻井液密度维持钻进,确保钻进作业安全顺利的进行,保护好油层,安全顺利完井,减少事故复杂,从而结余钻井成本,该技术的应用,为开发港17104区块高压含气井优化井身结构,降低成本,提供了技术借鉴、积累了宝贵的实践经验。

Bin 104x1 well is an evaluation well for evaluating the oil and gas bearing conditions of block West Fault Block17104 in Gangdong Oilfield, Dagang Oilfield. In this well, the second Kaifeng Guguantao formation is used, but the abnormal highpressure exists in the main oil and gas layer Sha 1, and the ground pressure coefficient of Dongying formation is low. There aremany high and low pressure coefficients in the same open hole section. The conventional drilling technology can not meet the needto increase drilling fluid density to balance formation pressure after drilling abnormal high pressure layer, which makes the upperDongying formation weak. The downhole is complicated, resulting in high risk of well control. The design of this well starts from3,000 m to apply the fine pressure control drilling technology. Through reasonable pressure control, the drilling fluid density is re-duced to maintain the drilling and ensure the safe and smooth drilling operation. Good reservoir protection, safe and smooth comple-tion, reducing the complexity of accidents, thus saving drilling costs. The application of this technology optimizes the wellbore struc-ture for the development of high-pressure gas-bearing wells in Block 17104 and reduces the cost, which provides technical referenceand accumulates valuable practical experience.