Basement rock fractured formation mixed drilling well completion process
A bedrock layer and fissure technology, which is applied in the field of mixed drilling in bedrock fractured formations, can solve the problems of difficult washing out of cuttings, mud cakes and fillings, small water output from a single hole, and meaningless drilling, and shorten the drilling time. The effect of improving the well construction period, increasing the permeable area, and reducing construction risks
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[0045]The mixed drilling process of bedrock fissure formation, the process steps are: ① The upper loose layer is drilled to a certain depth of the bedrock layer by the mud positive circulation process. After drilling, the surface casing is lowered and sealed with cement; The DTH hammer reverse circulation process is used for drilling. ③After drilling to the aquifer, when the back pressure of the water column in the hole affects the drilling efficiency, the gas lift reverse circulation process is used to drill until the target layer. ④Acid washing Well, ⑤ piston flushing, ⑥ air flushing, ⑦ water pump completion, that is, immediately after the air flushing is completed, the submersible pump is used to pump water until the pumping test is completed.
[0046] The acidizing well flushing means that after the drilling work is completed, firstly conduct electrical measurement and judgment of the layer, determine the fracture position of the target layer according to the electrical mea...
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