南海西部高温高压井堵漏技术

南海西部莺歌海盆地高温高压井储层段黄流组温度达到200 ℃，地层压力系数达到2.27，钻井过程中频繁出现井漏，其中高温高压井堵漏作业还存在着抗高温堵漏材料少、高温高压井控风险高、高密度堵漏浆流变性难以调控、堵漏作业经验少等诸多问题。在分析高温高压井前期堵漏经验及漏失原因的基础上，利用高温高压动态堵漏仪优选抗高温高压堵漏材料及堵漏配方，承压能力达到20 MPa。现场结合随钻堵漏以及承压堵漏，并使用抗高温弹性堵漏剂FLEX 配合刚性堵漏剂BLN 及承压堵漏剂STRH，成功实施高温高压井堵漏作业。

Plugging technology for HTHP wells in Western South China Sea

In the Yinggehai Basin, western South China Sea, the temperature of Huangliu Fm reservoirs in HTHP (high temperature and high pressure) wells is up to 200 ℃ and the reservoir pressure coefficient is 2.27. And circulation loss occurs frequently in the process of well drilling. The lost circulation operation on HTHP wells are faced with multiple difficulties, e.g. fewer high-temperature lost circulation materials, high risk of HTHP well control, high-difficulty control on rheological property of high-density lost circulation fluid and less experience. The reasons for circulation loss of HTHP wells and the previous control experience were analyzed. Then, the HTHP dynamic lost circulation device was used to optimize HTHP lost circulation materials and formulas to reach the pressure resistance of 20 MPa. By virtue of the lost circulation control while drilling and the lost circulation control under pressure, lost circulation operation was successfully completed in the actual HTHP wells by using high-temperature elastic lost circulation additive FLEX, combined with rigid lost circulation additive BLN and pressure-bearing lost circulation additive STRH.