Fracturing string with step-by-step setting and perforation and method of using the same

Abstract

The invention provides a gradually-set and perforated fracturing pipe column and an application method thereof. The fracturing pipe column comprises a plurality of fracturing slide sleeves which are connected with an oil pipe in series, and spraying and sealing integrated tools, wherein each fracturing slide sleeve corresponding to one spraying and sealing integrated tool; the bottom end of each fracturing slide sleeve is connected with the top of each spraying and sealing integrated tool; the fracturing slide sleeves and the spraying and sealing integrated tools are matched to use. The application method comprises the following steps: (1) assembling the fracturing pipe column; (2) putting the fracturing pipe column into a well and enabling a fracturing slide sleeve upper leaking channel of each grade of the fracturing slide sleeve to correspond to positions of a nozzle and a reservoir stratum section on each spraying and sealing integrated tool; (3) putting two times of starting balls in sequence aiming at each grade of the fracturing pipe column from bottom to top; after starting a fluke-shaped ball forming seat on the grade of the fracturing slide sleeve by the starting ball of the first time, enabling the starting ball to enter the spraying and sealing integrated tool; opening the nozzle and a pressure conveying hole and setting a rubber barrel; opening the leaking channel of the grade of the fracturing slide sleeve by the starting ball of the second time so as to realize large-displacement fracturing construction of simultaneously pumping in the oil pipe and an oil sleeve annular space.

Description

technical field [0001] The invention relates to a fracturing pipe string used in oil and gas exploitation operations, in particular to a fracturing pipe string with step-by-step setting and perforation, and a method for using the fracturing pipe string. Background technique [0002] In oil and gas exploitation, in order to improve the permeability of oil and gas layers, it is necessary to use hydraulic action to form seepage fractures in oil and gas layers. At present, due to the limitation of the structure of the fracturing string, the fracturing operation can only be realized by pumping fracturing fluid in the tubing or in the annulus of the oil casing, but cannot be realized in the tubing and the annulus of the casing. At the same time, the pumping fracturing construction has a relatively limited pumping volume of fracturing fluid, which leads to low fracturing construction efficiency and increased oil and gas production costs. Contents of the invention [0003] The pu...

AI Technical Summary

Problems solved by technology

At present, due to the limitation of the structure of the fracturing string, the fracturing operation can only be realized by pumping fracturing fluid in the tubing or in the annulus of the oil casing, but cannot be realized in the tubing and the annulus of the casing. Simultaneous pumping fracturing construction, the fracturing fluid pumping volume is relatively limited, resulting in low fracturing construction efficiency and increased oil and gas production costs

Images