A combined method of wellbore pressure testing and toe-end sliding sleeve start-up in shale gas horizontal wells

Abstract

The invention discloses a joint operation method of wellbore pressure testing and toe-end sliding sleeve start-up of a shale gas horizontal well. During the pressure relief process after the wellbore pressure test of the horizontal well, the pressure change in the wellbore is adjusted and controlled according to a preset coding mode. , The downhole intelligent toe-end sliding sleeve collects the pressure change signal in the wellbore, decodes the corresponding operation information, and performs the corresponding action by the intelligent toe-end sliding sleeve. The present invention provides a joint operation method of wellbore pressure test and toe-end sliding sleeve start-up in a shale gas horizontal well, which can realize the wellbore pressure test and toe-end sliding sleeve opening process, and the wellbore pressure test operation is not affected by the wellbore sliding sleeve. The opening process of the sliding sleeve is controllable to achieve precise and efficient fracturing.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas drilling, in particular to a joint operation method of wellbore pressure testing and toe-end sliding sleeve start-up of a shale gas horizontal well. Background technique [0002] As an important means of increasing production, fracturing technology is widely used in the exploitation of oil and gas. In order to generate more effective fracturing fracture networks and form more effective circulation channels for oil and natural gas, staged fracturing technology has emerged as the times require. After the cementing is completed, the wellbore must be pressure tested to test the sealing performance and cementing quality of the wellbore. However, the traditional toe-end sliding sleeve must be opened in advance for subsequent fracturing, so the pressure test of the entire wellbore cannot be performed. [0003] Among the existing patented technical solutions, the Chinese patent application number...

AI Technical Summary

Problems solved by technology

After the cementing is completed, the wellbore must be pressure tested to test the sealing performance and cementing quality of the wellbore. However, the traditional toe-end sliding sleeve must be opened in advance for subsequent fracturing, so it is impossible to carry out the pressure test of the entire wellbore.

[0003] Among the existing patented technical solutions, the Chinese patent application number 201220389849.9 discloses a tool that uses special material deformation to allow the fracturing ball to pass through. For the opening of the toe end sliding sleeve, the Chinese patents with patent application numbers 201811289313.8 and 201821782468.0 adopt the method of delayed start to control the toe end sliding sleeve, and the Chinese patent of 201921238429.9 adopts the way of diversion grooves. The structure of the above patent scheme is cumbersome. Complicated operation and low reliability

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