东濮凹陷废弃井改造成地热井先导试验

Pilot test of transforming abandoned wells into geothermal wells in Dongpu Depression

将地热资源丰富的油区内废弃井改造成为地热井,不仅赋予石油废弃井新的生命,还降低了地热开发的前期投入和投资风险。在东濮凹陷地热目标区块内,将优选的355口可利用废弃井分为6种类型,研究设计每一类废弃井的改造工程方案。以马古6井为例,根据其室内敏感性评价实验、水样分析、酸液体系和添加剂筛选结果,制定了酸洗解堵方案;配套流量、压力、温度及动液面测试技术,开展了现场改造先导试验,成功实施了井口恢复、储层解堵、试水测试等工艺,圆满达到了施工目的及要求,形成一套较完善的地热井测试工艺,为油田实现环保低碳供热及地热资源产业化发展提供了一套经济适用的新方法。

The geothermal resources of abandonment wells in oil fields are very rich. Remodeling these wells into geothermal wells not only gives them new life,but also reduces the initial investment and investment risk of geothermal development. In the geothermal target block in Dongpu Depression,the 355 available abandonable wells were divided into six types based on different wellbore structures,water layer position and the top depth of cement ring,etc. Each type of abandoned well was studied and their renovation plan was designed,respectively. Taking Well Magu6 as an example,according to its indoor sensitivity assessment experiment,water samples analysis,acid system and additive screening results,a scheme for plugging removal by acidization was formulated. In addition,in conjunction with flow,pressure,temperature,and dynamic liquid surface testing technologies,pilot tests were conducted in the field and successful completed the technical tests such as wellhead recovery,plug removal,and water testing,which satisfactorily met the construction purpose and requirements. This relatively complete geothermal well test technology provides an economical and applicable new method for oilfields to realize the development of environmentally friendly low-carbon heating and industrialization of geothermal resources.