东海气井高低压分层完井技术的研究与应用

Study and application of high and low pressure gas wells stratified completion technology in the east China sea

传统海上完井技术采用无固相完井液采用氯化钾调整密度,最高密度约为1.16 g/cm^3,满足压力系数相近的不同产层的分采或者合采完井要求,但对于部分产层压力系数差别较大,容易出现上喷下漏、储层污染、井控风险高的高低压分层完井要求,则常规技术无法满足作业。针对中国海上某油田,需要实现压力系数差值达到0.4的分层开采生产要求,通过新型无固相高密度完井液技术、低压层暂堵技术、阻挡碎屑等多项工艺技术的研究,形成了一套海上高低压分层完井工艺技术。最后在2口气井中进行了技术应用,结果表明该技术保护储层效果良好、作业井控风险可控,顺利实现高低压分层开采,具有较高推广价值。

The conventional offshore completion technique uses solid phase completion fluid with potassium chloride to adjust density, maximum density approximately 1.16 g/cm^3. This technique meets the requirements of separate production or combined production and completion of different production layers with similar pressure coefficient. But this technique does not satisfy the well with different pressure coefficients. Because it is prone to blowout,leakage, reservoir pollution, high risk of well control. In order to meet the needs of a certain offshore oilfield in China, it is necessary to realize the production requirements of slicing with a pressure coefficient difference of 0.4. A number of techniques are applied, such as solid phase high density completion fluid technology, temporary plugging technique in low pressure layer and blocking debris.