Shale sand fracturing pump stopping fracture diverting method

Abstract

The invention relates to a shale sand fracturing pump stopping fracture diverting method. The method is applied to a stratum with too high distortion friction in the shale fracturing process. The fracture diverting method comprises the steps that sand-carrying fluid is pumped and injected to polish a stratum crack, and the pumping and injecting pressure is monitored; when the pumping and injectingpressure rises to the limiting pressure of a well head, smooth water is used for replacing the sand-carrying fluid to carry out pumping and injecting; a pump is stopped, the first displacement is reduced to zero, and the zero displacement is maintained for a preset period; the pump is started, ahead fluid is pumped and injected, and the pumping and injecting displacement is quickly increased to the first displacement; after pumping and injecting of the ahead fluid is finished, the sand-carrying fluid is pumped and injected again to carry out fracturing construction; under the action of the pressure difference generated by energy pulses generated by pump stopping and pump starting and the sedimentation of a propping agent, a new crack is opened, and the crack is diverted; and the process is repeated to complete fracturing construction, wherein the first displacement is designed construction displacement or the maximum construction displacement under the limiting condition of the well head. The shale sand fracturing pump stopping fracture diverting method has the advantages that temporary blocking materials do not need to be added, the problem that the torsion friction is too high is solved, and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of shale reservoir fracturing, in particular to a pump-stopping fracturing steering method for shale sand-added fracturing. Background technique [0002] With the deepening of oil and gas exploration and development, the objects of fracturing stimulation are not limited to conventional oil and gas reservoirs, but gradually enter into unconventional oil and gas reservoirs, among which shale oil and gas is a typical representative of unconventional oil and gas reservoirs. In recent years, the scale of domestic shale oil and gas exploration and development has increased year by year, and the number of fracturing wells and stages has also increased year by year. Domestic shale oil and gas fracturing technology has also made great progress. However, with the improvement of shale oil and gas fracturing technology, There are also some technical difficulties. In the process of shale fracturing, there is the problem...

AI Technical Summary

Problems solved by technology

For example, one of the objectives of the present invention is to provide a pump-stop fracturing steering method that can solve the problem of high torsional friction during shale sand fracturing, failure to add sand or even sand plugging