辽河油田兴古7块地处生产生活设施密集的兴隆台市区,地层受早期采油与注水的影响,压力紊乱,存在圈闭憋压及亏空现象,同一裸眼段存在多套压力层系,很容易出现“喷漏同存”的复杂情况。加上存在异常高压气层、天然气中含有H2S气体(在钻井液中浓度15mg/m3左右)以及在高危地区施工,井控难度极大。为此,在该区块钻井施工中不仅配备了高规格的井控设备,加强了现场应急管理,而且采用了优化井身结构、提高地层承压能力、控制钻井液密度、减少抽汲、科学选用堵漏和压井方法等预防井喷事故技术措施,实践证明所应用的井控技术科学可行。 Block 7, Xingu, Liaohe Oilfield is located in downtown Xinglongtai where production and living facilities are intensive. The strata are affected by the early oil production and water injection, and the pressure is disturbed. There are trap pressures and deficits in the traps. There are multiple sets of pressure strata in the same naked eye zone. Prone to “spray leak with the same ” complex situation. Coupled with the existence of abnormally high pressure gas layer, natural gas containing H2S gas (concentration of 15mg / m3 in drilling fluid) and construction in high-risk areas, well control is extremely difficult. For this reason, not only the high-standard well control equipment has been equipped in this block drilling operation, the on-site emergency management has been strengthened, but also the well structure has been optimized, the bearing capacity of strata has been improved, the density of drilling fluid has been controlled, and the pumping technology has been reduced. Selection of plugging and killing methods such as blowout prevention measures, practice proved that the well control technology used is scientific and feasible.