The Technology Study Of The Prepared And Directional Fracture Splitting Several Cracks

The water power fracture is valid means that the low permeability oil deposit in the development. Because the normal regulations method of perforation adopts the spiral type to play the way, The opening direction of the water power fracture always carries on the extension along perpendicularity direction in the minimum lord of geologic strata, This kind of circumstance caused that the crack of the water power fracture can't connect with natural growth crack of geologic strata probably. Moreover, for the well or oil well by the water power fracture repeatedly, the crack extension direction of the water power fracture is still along the firsthand opening direction of the crack, that results in the limit of the repeated fracture effect on a certain degree.The technique of the prepared and directional fracture to improve fracture effect, is to carry on the kerf processing deeply by the definite direction, at the needed fracture layer. The first is to prepare several cracks in the different depth and different direction of the layer. Then, according to the split result, have the selectivity to carry on the fracture, break the proper mode of the crack extension direction in the water power fracture, and form the new crack in the part department of the oil layer. This text mainly carried on the research at following several respect: One is the design of the underpit split tools by the liquid dint and the parameter optimization of the construction technology; The second is the simulation study, which is the influence of the prepared and directional split in the geologic strata ground and permeate; The third is the simulation study of the split extending shape after the directional fracture.By means of the laboratory research and the experiment on the scene, It shows that the several cracks technique of prepared and directional fracture has the deeply ability to penetrate, and increases validly the infiltrating fluid area between the geologic strata and the well, It can't arise the pressed solid effect; Moreover, this technique can control the crack extension direction in the fracture layer during the fracture, and so, it has the significance advantage in the oil deposit reconstruction of the low permeate oil deposit.