Differential pressure sliding sleeve and oil-gas well fracturing construction method

Abstract

The invention provides a differential pressure sliding sleeve. The differential pressure sliding sleeve comprises an outer cylinder, an upper connector, a lower connector, an inner cylinder and a bearing ring, wherein a plurality of flow guide holes are formed in the side wall of the outer cylinder; the upper connector and the lower connector are arranged at the two ends of the outer cylinder and used for being connected with an underground pipe column respectively; the inner cylinder is arranged in the outer cylinder and used for sealing the flow guide holes; the bearing ring is arranged between the lower connector and the inner cylinder and can be dissolved under the action of working fluid; and the area of the upper end face of the inner cylinder is set to be larger than that of the lower end face of the inner cylinder so that the working fluid can form a pressure difference between the axial end faces of the inner cylinder to provide downward pressure for the inner cylinder, and then the inner cylinder can move downwards under the action of the pressure after the bearing ring is dissolved to open the flow guide holes. The invention further provides an oil-gas well fracturing construction method using the differential pressure sliding sleeve.

Description

technical field [0001] The invention relates to the technical field of oil and gas well completion and reservoir transformation, in particular to a differential pressure sliding sleeve. The invention also relates to an oil and gas well fracturing construction method. Background technique [0002] In recent years, oil and gas well exploration and development projects have developed rapidly. At present, in the vigorous development of shale gas wells, there are generally two ways to fracturing the first stage of shale gas wells, one is to use coiled tubing perforation, and the other is to use differential pressure sliding sleeves. The coiled tubing perforation method is mainly used to open the first section of the wellbore, and it is a relatively mature technical method in the application of opening the first section of the wellbore at present. However, when the coiled tubing perforation method is applied in shale gas wells, the construction time is low and the construction c...

AI Technical Summary

Problems solved by technology

However, there are still some problems with the existing differential pressure sleeve

For example, the success rate of opening is low, and the window left for the construction operation of the differential pressure sliding sleeve is small

At present, the pressure test of the entire wellbore of shale gas wells is above 90MPa, and the pressure level of the wellhead device is 105MPa, which makes the pressure range of the allowable opening differential pressure sliding sleeve small, making it difficult for ordinary differential pressure sliding sleeves to open within the above pressure range.

The pressure to open the differential pressure sliding sleeve needs to be higher than the full wellbore pressure test pressure, which has a greater risk

In addition, the ordinary time-delay differential pressure sliding sleeve adopts a time-delay structure, and its liquid inlet hole is small, which is easy to cause blockage, so that it is not easy to open, and the time-delay differential pressure sliding sleeve also has a short delay time, so it cannot be repeatedly tested. And other issues

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