High seam shale gas technology control

When a thin layer resin coated frac sand the oil and gas producing formation and occlusion layer or the minimum horizontal principal stress difference is small , the pressure to open the fracture height is very easy to enter the block layer , then the need to control the height of the crack extension . Performance by controlling the fracturing fluid displacement parameters and construction to achieve more reliable artificial barrier controlled seam high fracturing technology. The basic principle is added in front of the float type liquid or sunken directing agent , by bringing it into the crack front fluid , floating -directing agent and agent -oriented style sink floating and sinking were gathered at the top and bottom of the artificial cracks , formation of compacted low permeability artificial barrier to prevent cracks in pressure up / down spread , reaching a high slit control purposes . In order to make the two -directing agent can float and sink , usually carrying directing agent after injection of liquid short-term stop the pump , then normal fracturing operations . Control joints artificial barrier layer and mainly for the production of high-tech non-productive layers interbedded massive homogeneous formation ; inter- layer and gas production , the water layer without good barrier ; production layer and cover layer stress difference can not effectively control the vertical cracks to extend . Testing fracturing technology : Test fracturing fracturing , fracturing proppants also known as small-scale test , which is carried out a small-scale fracturing fracturing pressure to obtain and analyze the parameters of cracks . Including crack extension stress tests , fracture closure pressure test , micro- injection test.