a delay slide

Abstract

The invention discloses a time-delay sliding sleeve, which belongs to the field of oil field development. The time-delay sliding sleeve includes: a left joint, an outer cylinder, a right joint connected in sequence from left to right, an inner cylinder, a separation ring, a time-delay mechanism and a starting ring. Wherein, the cylinder diameter at the left end of the inner cylinder is larger than that at the right end, and is slidably sleeved in the outer cylinder. The inner cylinder is connected to the starting ring, and a sealed annular space is provided between the inner cylinder and the outer cylinder, and the starting ring is used to separate from the inner cylinder after the pressure reaches a preset value. A fracturing hole located on the left side of the annular space is arranged on the side wall of the outer cylinder. Hydraulic oil is arranged in the right chamber, and the delay mechanism is used to control the flow of hydraulic oil and the real-time on-off of the right chamber and the left chamber. The time-delay sliding sleeve provided by the present invention can not only meet the construction requirements of establishing the first fracturing channel, but also has simple operation, short operation period and low cost, and can precisely control the communication time between the inner cavity of the inner cylinder and the fracturing hole, realizing full Wellbore pressure test.

Description

Technical field [0001] The present invention relates to a very good oil-air field development, and in particular, there is a delayed slide. Background technique [0002] In a very organic oil-retrieval development, in order to improve the fluid environment in the underground, the oil well production increases, and the segmental fracturing operation is generally required. Before the fracturing operation, it is important to establish a first fracturing channel in the oil and gas well. [0003] Related techniques For fracturing operation, the consecutive tubes are used on a fracturing tube on a fracturing tube or a routine to establish a first fracturing passage in an oil and gas well. [0004] The inventors have found that the prior art has at least the following problems: [0005] If the fracturing operation is required in a deeper horizontal well, then the continuous tubes are emitted on the fracture tube to establish a first segment fracturing channel in the oil and gas well, no...

AI Technical Summary

Problems solved by technology

[0005] If it is necessary to perform fracturing operations in deep horizontal wells, then perforating the fracturing string through coiled tubing to establish the first section of fracturing channels in oil and gas wells not only has a long period and high cost, but also is limited by the wellbore trajectory. and coiled tubing operation length limitation

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