海上油田固井防砂一体化技术

Integrated cementing and sand control technology in offshore oilfields

为了解决老井开窗后固井与防砂问题。根据海上油田层系复杂、出砂严重、作业日费高等特点,研究了一种适用于海上油田的新型固井防砂一体化工艺技术,该技术一趟钻将防砂管柱与固井管柱下入井内,然后通过在不同位置的操作,可实现上部问题井段的固井作业和下部油层段的防砂作业,作业过程中可控制防砂段的静液柱压力,防止地层坍塌,作业结束后无需钻塞,避免了水泥对储层的污染,完井后管柱通径较大,利于后期开采或修井作业。该技术解决了长期困扰海上油田老井改造的技术难题,同时该技术在降低完井成本和后期作业难度等方面起到了积极作用。

In order to deal with cementing and sand control in old wells after window cutting,a new type of integrated cementing and sand control technology suitable for offshore oilfields was developed based on the characteristics of offshore oilfields,e.g.complex formation,serious sand production and high daily operation cost.By virtue of this technology,both sand control string and cementing string are run in the hole by one trip.Then,the cementing operation in the upper troubled section and the sand control in the lower oil layer can be realized by carrying out the operation in different locations.During the operation,the hydrostatic column pressure of sand control interval can be controlled to prevent formation collapse.After the operation,plug drilling is not needed,so reservoir contamination is avoided.The string size after the completion is larger,and it is conducive to the late production or workover.This technology solves the technical difficulties that have hindered the stimulation of old wells in offshore oilfields for a long time,and also plays an active role in reducing the completion cost and alleviating the operation difficulty in the late stage.