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Statoil公司选择甲酸铯盐水配制钻井液和完井液,用于开发高温高压的Kvitebjφrn气田。选择甲酸铯盐水主要是为了减少井控问题并提高井的产能。在过去5年中,Statoil公司所完成的高温高压钻井和完井作业已证实了甲酸铯盐水的主要优势,使用同样的流体体系进行钻井和完井还可以简化作业程序,减少浪费,解决不同流体的兼容性问题。Kvitebjφrn气田的难题在于以大斜度井眼轨迹钻穿多个页岩层段进入储层,储层压力高达81MPa,温度高达155℃。到目前为止,在Kvitebjφrn气田用甲酸铯盐水已成功地完成了7口大斜度高温高压生产井的钻井、完井和测井作业,其中2口井以固井尾管完井,5口井以滤砂管完井。此外,还从Kvitebjφrn平台钻了1口大位移探井,钻至Valemon构造。这口井井深7380m,储层段长705m,井斜角69°,也是用甲酸铯钻井液体系成功地完成了钻井作业。在所有这些井中,甲酸铯盐水体系都显示出优良的性能,如非常低的当量循环密度、中等至较高的机械钻速、良好的井眼净化能力、电测时极佳的井壁稳定性。在完井作业中也呈现出速度快、无复杂情况、安全、稳定的特性,已投产井的表皮系数较低,产能较高。
Statoil chose cesium formate brines to prepare drilling fluids and completion fluids for the development of high temperature and pressure Kvitebjørn gas fields. Cesium formate brine is chosen primarily to reduce well control problems and increase well productivity. Over the past five years, the high temperature and pressure drilling and completion operations performed by Statoil have demonstrated the major benefits of cesium formate brines. Using the same fluid systems for drilling and completion can also simplify operating procedures, reduce waste, and solve different fluids Compatibility issues. The challenge in the Kvitebjørn gas field is drilling multiple shale intervals into the reservoir with high-inclination wellbore trajectories, with reservoir pressures up to 81 MPa and temperatures up to 155 ° C. To date, drilling, completion and logging operations have been successfully completed in seven KPHT production wells in the Kvitebjörn gas field with cesium formate brines. Two of the wells were completed with cementing tailpipes, five with Filter sand completion. In addition, a large displacement exploratory well was drilled from the Kvitebjørn platform to the Valemon structure. The well depth of 7380m, reservoir length of 705m, well angle of 69 °, but also the cesium formate drilling fluid system successfully completed the drilling operation. In all of these wells, the cesium formate brine system showed excellent performance, such as very low equivalent cycle density, moderate to high ROP, good hole cleaning capability, excellent borehole stability at the time of electrical measurements . In the completion of operations also showed a fast, complex, safe, stable features, has been put into production wells lower skin factor, higher productivity.