Continuous oil pipe and fracturing pipe column hanging and uncoupling device

Abstract

The invention discloses a continuous oil pipe and fracturing pipe column hanging and uncoupling device. The hanging and uncoupling device consists of a hanger and an uncoupling apparatus; the hanger is fixedly arranged below a wellhead hanging and sealing device; and the upper end of the uncoupling apparatus is connected with a continuous oil pipe, and the lower end of the uncoupling apparatus isconnected with a fracturing pipe string. According to the continuous oil pipe and fracturing pipe column hanging and uncoupling device, the fracturing pipe string and the continuous oil pipe can be successfully uncoupled at a wellhead, so that the continuous oil pipe can be extracted from the wellhead and a blow-out preventer; the fracturing pipe string is hung below the wellhead, so that the problem that the production is affected because a fracturing tool pipe string of the continuous oil pipe is overlong and cannot be timely extracted after a stratum is fractured is solved; the device can realize belt pressure operation and protect the stratum; and because the length of the fracturing tool pipe string is not limited by the height between the blow-out preventer and a main gate of the wellhead and can be randomly adjusted, the clamping distance between packers of the tool string is greatly increased, and the range of an oil-gas layer capable of being reformed is greatly increased.

Description

technical field [0001] The invention relates to a coiled tubing fracturing tool in oilfield development, in particular to a suspension disconnecting device capable of disconnecting the coiled tubing and the string of the fracturing tool at the wellhead and leaving the string at the wellhead. Background technique [0002] In the existing coiled tubing fracturing process, the string of fracturing tools is connected to the coiled tubing and run into the well together with the tubing for construction; After cracking, the conductivity of the formation is greatly improved, resulting in an increase in the fluid flow and pressure in the well. In order to prevent the wellhead from blowing out, there are two solutions on site. The first solution is to operate under pressure. The outer diameter of the cracking tool pipe string is smaller than the inner diameter of the wellhead and larger than the inner diameter of the blowout preventer. The pipe string can be lifted up to the bottom of...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coiled tubing fracturing string hanging and disconnecting device, which can smoothly disconnect the fracturing tubing string from the coiled tubing at the wellhead, so that the coiled tubing can be pulled out from the wellhead and the blowout preventer, and the fracturing The pipe string is suspended below the wellhead so as not to affect the normal production, effectively solving the problem that the coiled tubing fracturing tool string is too long and cannot be pulled out in time after formation fracturing

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