改良油基钻井液在WZ6-13-A3井的应用

The improved oil-base drilling fluid was successfully applied in wz6-13-a3 well

涠洲区块地质结构复杂,复杂井、特殊井作业特别多,其中地层涠洲组裂缝发育的灰色泥岩较多,流沙港组页岩和油页岩页理发育较好,普通水基钻井液难以解决钻井中存在的问题,从20世纪90年代引入油基钻井液技术以来,解决初期钻井的难题——井壁失稳,但是随着开发区域的深入,复杂井增多[1],要求油基钻井液必须升级改良,才能保障裂缝性地层的井壁稳定,最终实现改良油基钻井液在WZ6-13-A3井的成功应用。

Weizhou blocks in complex geological structure,complex well,special well work much more special,among which cracks formation weizhou grey mudstone,shale and shale lamellation quicksand port group development is good,ordinary water-based drilling fluid is difficult to solve the problems in drilling,since the introduction of oil-base drilling fluid technology in the 1990 s,solve the problem in the early drilling,sidewall instability,but with the deepening of the development area,complex Wells in [1],require oil-based drilling fluid must be upgraded to improve,to ensure fractured formation of sidewall stability,finally realizes the improvement of oil-base drilling fluid in WZ6-13 - A3 has been applied successfully to the well.