Coiled tube fracturing and well completion integration technological method for vertical gas well

Abstract

The invention belongs to the technical field of vertical well fracturing in gas fields, and particularly relates to a coiled tube fracturing and well completion integration technological method for a vertical gas well. The coiled tube fracturing and well completion integration technological method for the vertical gas well includes following steps: 1) lowering a tool string into the vertical well; 2) perforating and fracturing each segment of the tool string; 3) throwing soluble balls into the vertical well from a wellhead, achieving releasing through a hydraulic releasing tool, and dropping the fractured tool string to the artificial bottom of the vertical well; 4) using a coiled tube as a production string and leaving the production string in a shaft of the vertical well after the soluble balls are completely dissolved; 5) dismantling the fractured wellhead, installing a coiled tube hanger and a gas recovery tree, and performing draining and production; 6) fishing the fractured tool string out of the shaft according to needs at the production tail. The coiled tube fracturing and well completion integration technological method for the vertical gas well reduces construction risk of the production string under pressure, shortens a gas testing task cycle, and simultaneously can observably improve fluid carrying capability of the vertical gas well, timely drains formation water out of the shaft, and prolongs a gas well production cycle.

Description

technical field [0001] The invention belongs to the technical field of gas field vertical well fracturing, and in particular relates to an integrated process method of coiled tubing fracturing and well completion for gas well vertical wells. Background technique [0002] Coiled tubing fracturing technology has incomparable advantages compared with conventional technologies, such as unlimited number of stimulated layers, dragging operation under pressure, and maintaining a large borehole diameter after fracturing. Coiled tubing sandblasting and perforating and annular fracturing have the characteristics of reliable isolation, large fracturing displacement, and high construction efficiency, and are widely used. [0003] However, after the fracturing of this process is completed, the fracturing string needs to be pulled out and then lowered into the production string under pressure (generally using 2?" tubing or 3?"+2?" tubing combination). On the one hand, there is a relativel...

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Problems solved by technology

[0003] However, after the fracturing of this process is completed, the fracturing string needs to be pulled out and then lowered into the production string under pressure (generally using 2?" tubing or 3?"+2?" tubing combination). On the one hand, there is a relatively large construction On the other hand, for low-pressure and low-yield gas wells, hydrocarbon condensate or formation water will flow into the bottom of the well during the production process. Due to the poor liquid-carrying capacity of the large-diameter tubing (produced gas will be lost due to the low flow rate) cannot meet the requirements of continuous liquid carrying), resulting in increasing fluid accumulation in the wellbore and increasing back pressure at the bottom of the well, sometimes even completely crushing the gas well and shutting the well, which directly affects the production and recovery rate of the gas well

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