External packer of expanding sealing sleeve of internal pipe string tool and construction technique

Abstract

The invention relates to an external packer of an expanding sealing sleeve of an internal pipe string tool and a construction technique. The external packer is characterized by comprising an upper expanding type pipe internal packer (1), a constant pressure valve (2), a lower expanding type pipe internal packer (3), a horizontal well ball seat (4), a leading shoe (5) and an oil pipe of a connecting part Phi 73; the upper expanding type pipe internal packer (1) and the lower expanding type pipe internal packer (3) are connected with each other by the oil pipe of Phi 73 and the constant pressure valve (2); the lower expanding type pipe internal packer (3) is connected with the horizontal well ball seat (4) by the oil pipe of Phi 73; the lower end of the horizontal well ball seat (4) is connected with the leading shoe (5) by the oil pipe of Phi 73; and the upper expanding type pipe internal packer (1), the constant pressure valve (2) and the lower expanding type pipe internal packer (3) are hollow bodies. The invention can effectively improve setting success rate of the external packer of the sleeve, and evaluate the setting effect in time; and simultaneously, the packer and the construction technique thereof are characterized by stable performance, little risk and high reliability.

Description

technical field [0001] The invention relates to a packer and a setting process thereof when setting an outer casing packer in the field of petroleum well completion, in particular to an inner pipe string tool expanding and sealing an outer casing packer and a construction process. Background technique [0002] When the outer casing packer is used for setting, the ball seat is usually used to hold the pressure, so as to achieve the expansion sealing operation of the outer casing packer. This has the following disadvantages: first, it is not conducive to the precise control of downhole construction pressure; second, it is not suitable for the construction operation of multi-stage casing outer packers; The reason is that there is a risk of using graded cementing equipment to pitch the ball and suppress the pressure. The operation of the conventional expansion-sealing casing outer packer is to use the ball to hold the pressure and expand the outer casing packer (pressure 8 ~ 10...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide inner pipe string tools to expand and seal casing outer packers and construction techniques, so as to solve the problems of inaccurate bumping control and inability to check sealing and channeling during operation of expanding casing outer packers, and effectively improve casing The setting success rate of the outer pipe packer can be evaluated in time, and the setting effect can be evaluated in time. At the same time, the packer and its construction process have the characteristics of stable performance, low risk and high reliability

Images