Large-span well segmented hydraulic impact fracturing pipe column and implementing method thereof

Abstract

The invention belongs to the technical field of oil-gas field reservoir transformation and discloses a large-span well segmented hydraulic impact fracturing pipe column and an implementing method thereof. The pipe column comprises two or more hydraulic impact fracturing devices connected in series. Except for the hydraulic impact fracturing device on the lowermost portion, the remaining hydraulicimpact fracturing devices are internally provided with guiding pipes, ball seats and central pipes and used for transmitting the liquid pressure and conducting hydraulic impact fracturing on the nextoperation section. During implementing, firstly, the pressure is increased to the pressure resistance value of an impact piece in the hydraulic impact fracturing device on the lowermost portion through a ground pump, and hydraulic impact of an operation section on the lowermost portion is completed; then, steel balls suitable for the ball seats in the hydraulic impact fracturing devices at the sections are sequentially released segment by segment from bottom to top, and pressurizing is conducted again through the ground pump, so that the central pipes are sealed by the steel balls falling intothe ball seats, pressure relief holes are opened through a pressurizing hole-opening valve, then continuous pressurizing is conducted, and when the pressurizing value reaches the pressure resistancevalue of an impact piece in the hydraulic impact fracturing device at the corresponding section, hydraulic impact of the operation section is completed; and the steps are repeated till hydraulic impact of all the operation sections is completed.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field reservoir reconstruction, and in particular relates to a segmented hydraulic impact fracturing pipe string for a large-span well and an implementation method thereof. Background technique [0002] Hydraulic shock fracturing technology is a green, low-cost hydraulic fracturing technology that does not occupy operating space. It has been studied and applied in China since the 1980s and 1990s. It has been implemented in thousands of wells in other oil fields, and the effect is remarkable. This technology can be operated with conventional acidizing pumps or cementing pumps. It does not require fracturing pumps and a large amount of fracturing fluid, does not occupy platform space, and the percussion tools can be reused with low cost. Compared with hydraulic fracturing and deflagration fracturing, the operating cost can be greatly reduced, and at the same time, it does not involve pyrotechnic...

AI Technical Summary

Problems solved by technology

In order to achieve multi-layer operation, the multi-stage hydraulic deblocking supercharger requires high-horsepower fracturing pumps and other equipment. Secondly, due to the connectivity between the annulus and the formation, there is a risk that the supercharger will not work.

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