摘要
故城县位于河北省东南部,地热资源丰富,为满足供暖和温泉需求,目前已经布置多口地热井。该区地热井以奥陶系灰岩地热储层为主要目的层,探索各目的层段储层发育特征、横向展布规律及含水特性。地热井多采用三开制结构,通过钻进、下套管封固止水、洗井试水等工序最终成井,其中遇到了:防斜、清水钻进、卡风化壳、增水工艺等到四大技术难题。
Gucheng County is located in the southeast of Hebei Province, with rich geothermal resources. In order to meet the demand of heating and hot spring, several geothermal wells have been arranged. The geothermal wells in this area take Ordovician limestone geothermal reservoir as the main target reservoir, and explore the reservoir development characteristics, horizontal distribution rules and water cut characteristics of each target interval. Geothermal wells are mostly of three open system structure, which are finally completed by drilling, casing sealing and water stop, well flushing and water test, among which four technical problems are encountered: two open and deviation prevention, clear water drilling, geological sticking and water increasing technology are adopted for drilling fluid.
