Cementing casing ten dozen grade Fracturing

This is the most commonly shale formations way ( see Figure ^ ) ) . When completions , the first of the horizontal wellbore casing cementing , and implementation of the " bridge plug ten perforation " multi -stage fracturing , which achieved mechanical packer inside the casing through the cable coiled tubing packer or bridge plug proppants for hydraulic fracturing  by solid well realize annulus mechanical steering . This process is then repeated to complete the multi-stage fracturing in horizontal section . When all the small pieces to be dealt with, in addition to the use of coiled tubing drilling composite bridge plug so that the horizontal wellbore re- connected from the heel to the end and put into production. Although this approach can achieve the level of sub- section steering transformation, but at every level have to use coiled tubing , perforating guns and fracturing equipment for proppant suppliers operations, production costs are very high, and low operating efficiency , time-consuming . Studies have shown that the yield obtained using this method is also not ideal, because cementing will block many natural cracks and joints , and these cracks and joints are very important for improving gas production.