Single-pipeline pressure-adjustment type double-end-blocked fracturing machine and fracturing method

Abstract

The invention relates to a single-pipeline pressure-adjustment type double-end-blocked fracturing machine and a fracturing method. The single-pipeline pressure-adjustment type double-end-blocked fracturing machine comprises a tail hole sealing machine, a communicating pipe and a front part hole sealing machine which sequentially communicate with one another in a drilling direction; a fracturing unit is arranged between the front part hole sealing machine and the tail hole sealing machine; the fracturing unit consists of a pressure adjustment part and a fracturing part; before fracturing of anore deposit is carried out, the pressure adjustment part is used for setting the opening pressure of the fracturing part; the tail hole sealing machine is connected with a high-pressure water fillingdrill rod; the high-pressure water filling drill rod is connected with a pump station and extends into a drilled hole so that the fracturing unit is placed at a to-be-fractured position; the tail holesealing machine and the front part hole sealing machine are expanded and are tensioned on the wall of the drilled hole with increment of the water filling pressure; the water filling pressure continues to be increased until the water filling pressure is equal to the opening pressure; at the moment, the tail hole sealing machine, the pressure adjustment part and the fracturing part communicate with one another; and high-pressure water enters the fracturing part to realize fixed-point fracturing. The single-pipeline pressure-adjustment type double-end-blocked fracturing machine provided by theinvention changes the traditional double-pipeline fracturing way, makes the hydraulic fracturing operation be simpler by only one pump station and only one pressurization operation, and can greatly lower the fracturing cost.

Description

technical field [0001] The invention belongs to the technical field of fracturing devices, and in particular relates to a single-pipeline pressure-adjustable double-end plugging fracturing device and a fracturing method. Background technique [0002] Hydraulic fracturing anti-permeability technology is to inject high-pressure fluid into the target coal seam, causing the accumulation and loss of control of the elastic energy of the coal reservoir, thereby changing its effective pressure system and effective migration system, and prompting the coal reservoir to form a new fracture system or restart and communicate. The self-generated fracture system of the coal seam forms a new, large-scale connected gas drainage diversion channel to achieve the purpose of increasing the permeability of the coal seam. At present, the hydraulic fracturing devices used in domestic hydraulic fracturing and anti-reflection are all designed with dual pipelines, which require two pumping stations to...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of the current dual-pipeline fracturing device, such as complex operation, high cost, high processing difficulty and easy leakage, the present invention provides a single-pipeline pressure-regulating double-end plugging fracturing device and a fracturing method, which only requires one Pumping station, one pressurization operation, makes hydraulic fracturing operation easier and can greatly reduce fracturing costs

Images