Integrated damping switch separate layer fracturing device and method

Abstract

The invention discloses an integrated damping switch separate layer fracturing device and method. According to the technical scheme, a closing spring and a closing sleeve are sequentially and movably arranged on an upper connector in a sleeving mode from top to bottom, the interior of the upper connector is fixedly connected with a fracturing sliding sleeve, a hole type fracturing channel is formed in the middle of a middle connector, an inner protection ring is arranged in an annular space of the middle connector and the fracturing sliding sleeve in a sleeving mode, and an outer protection ring and a flow guide sleeve are fixedly connected with the exterior of the middle connector; the interior of the lower end of the middle connector is fixedly connected with the upper portion of a center pipe, and a sliding sleeve sealing cavity is formed in the center pipe and used for bearing the fracturing sliding sleeve; and the upper portion of a rubber sleeve is fixedly connected with the middle connector through an upper rubber sleeve base, and the lower portion of the rubber sleeve is movably connected with a lower connector through a lower rubber sleeve base. The integrated damping switch separate layer fracturing device and method have the advantages that the overall length of the device is reduced, a damping sliding sleeve automatic closing mechanism is additionally arranged, erosion of a propping agent to the closing sleeve during fracturing construction is reduced, the closing effect is improved, multi-layer fracturing construction is met, and backwashing of each layer of fracturing construction is thorough and effective.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing, in particular to an integrated damping switch layered fracturing device and method. Background technique [0002] Due to the poor connectivity of low permeability reservoirs, the production of oil wells is low before measures are taken. During oilfield development, low permeability formations should be fractured to increase formation connectivity, improve oil well productivity, and achieve the purpose of economical and efficient production. With the continuous improvement of oilfield development technology, the technical demand for fine layered fracturing in multi-layer sections is becoming more and more extensive. With the continuous deepening of oilfield exploration in my country and the continuous improvement of oil layer stimulation technology, layered development technology has It is widely used in the development of oil and gas reservoirs, especially thin interlayer and low perme...

AI Technical Summary

Problems solved by technology

The supporting products of layered fracturing technology are combined and connected by fracturing sliding sleeves, packers, and ball seat sealing cylinders. The overall length is long, and it is difficult to implement layered fracturing for wells with thin interlayers and limited isolation positions.

After the current fracturing tools are completed, the fracturing channel cannot be closed. As a result, during the multi-layer fracturing operation, the backwashing process cannot realize the backwashing of the entire well section, which may easily lead to the risk of pipe string sticking

Images