Downhole hydraulically controlled full-open sliding sleeve sandblasting and isolation integrated staged fracturing device

Abstract

The invention discloses a downhole fluid-controlled full-open sliding sleeve sandblasting and isolation integrated segmental fracturing device, which is especially suitable for segmental fracturing construction of horizontal wells. The device includes a sandblasting device and a packer. The sandblasting device is provided with a sliding sleeve, and the packer is provided with a rubber cylinder; It is connected with the upper joint, and the sandblasting port jacket is installed on the outside to provide effective protection for the sandblasting port. The sliding sleeve is installed inside, and the lower part is connected with the receiving cylinder, and the outer cylinder body and the packer central pipe are connected through the receiving cylinder to realize the isolation connection of the packer; the receiving cylinder and the sliding sleeve are connected by starting shear nails and are equipped with a setting inlet hole, which communicates with the hydraulic control channel of the packer to effectively control the setting and unsealing of the packer . The invention has the advantages of simple structure and reliable operation, and can realize multi-layer and segmented fracturing construction, effectively increase the fracturing scale and the number of stages, can realize the backwashing of the whole well section, and ensure that the fracturing pipe string is pulled out at one time.

Description

technical field [0001] The invention relates to the oil well fracturing construction of horizontal wells in the petroleum industry, especially the downhole fluid-controlled full-open sliding sleeve sandblasting and isolation integrated segmental fracturing device, which is an unconventional fracturing device for low-permeability oil reservoirs and shale oil and gas. The staged fracturing tool for casing cementing, perforating and completion of resource development is especially suitable for staged fracturing construction of horizontal wells. Background technique [0002] At present, nearly 50% of my country's proven low-permeability reserves are difficult to develop due to low production capacity and poor mining efficiency. How to efficiently and economically produce low-permeability reserves is a long-term problem. Horizontal well staged fracturing technology is the key technology to solve the development of horizontal wells in low-permeability oilfields. Among them, the s...

AI Technical Summary

Problems solved by technology

Existing staged fracturing tools, such as: a pressure-guiding sandblasting packer for multiple layers of non-moving string fracturing with application number 201120468277.9, relies on the anti-wear sleeve on the choke nozzle to generate a choke pressure difference When the expandable packer is in the setting state, not only will it cause damage to the casing during fracturing, but also its inner diameter is limited, which limits the size of the ball, fracturing scale and stage series; the tool does not have sandblasting If there is sand plugging or sand sticking, the backwashing of the whole well section cannot be carried out, and the construction risk is high. The segmental sand settling makes the pipe string unable to be pulled out at one time, which increases the construction cost

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