A high-efficiency staged fracturing method for horizontal wells isolated without tools

Abstract

The invention provides a tool-free-packing horizontal well efficient staged fracturing method. The tool-free-packing horizontal well efficient staged fracturing method comprises the steps that 1, a drilling tool is tripped, specifically, an oil tube or a coiled tubing which is sequentially connected with a safe release, a multi-cluster spraying gun and a check valve from top to bottom penetrates into a casing pipe, a construction pipe string is tripped into the preset position, a wellhead is mounted, and a ball catcher is mounted at the wellhead; 2, hydraulic sandblasting perforation is conducted, specifically, ball injecting is conducted after a circulating wellbore is normal, and multi-cluster hydraulic jet perforation is conducted on the first stage; 3, fracturing construction is conducted, specifically, after hydraulic sandblasting perforation is completed, the drilling tool is adjusted to the second stage of perforation position, the wellhead is mounted, a steel ball is recoiled out, and fracturing operation is conducted on the first stage of target layer; and 4, staged operation is conducted, specifically, after open flow is conducted, the staged operation is conducted untilstaged pressure test is qualified, construction of other stages is conducted, horizontal well staged fracturing is realized, effectiveness of each cluster of crack initiation in each stage is ensured,full bore of the wellbore is maintained, the problems such as jamming of the drilling tool and abrasion of the drilling tool after fracturing of a conventional horizontal well are avoided, and the effectiveness and construction efficiency of staged fracturing modifying are improved.

Description

technical field [0001] The invention relates to a high-efficiency segmental fracturing method for sealing a horizontal well without tools, and belongs to the field of petroleum fracturing. Background technique [0002] The staged fracturing technology of horizontal wells is one of the main methods for increasing production of low-permeability, ultra-low-permeability and tight reservoirs, and the key technology lies in the effective isolation of the wellbore. So far, major isolation technologies such as chemical isolation, mechanical isolation and hydraulic injection self-isolation have been formed. Based on this, the mainstream horizontal well staged fracturing technologies include hydraulic injection staged fracturing with bottom seal, hydraulic pumping bridge plug Staged fracturing, open hole packer staged fracturing and other technologies. Among them, hydraulic sandblasting fracturing and bridge plug mechanical isolation staged fracturing are the most widely used, and ha...

AI Technical Summary

Problems solved by technology

However, hydraulic jet staged fracturing with bottom seal requires replacement of pipe strings, which is time-consuming and labor-intensive, and accidents such as pipe sticking are prone to occur

The hydraulic pumping bridge plug staged fracturing process is complex, with high requirements on completion quality, wellbore trajectory and wellbore integrity, and the bridge plug needs to be drilled and ground after fracturing

Open hole packer completion ball staged fracturing uses packer strings as the completion string to be permanently lowered, and there is no circulation channel in the horizontal section, which increases the construction risk of later workover operations

On the other hand, for wells with casing deformation during the fracturing process, conventional mechanical isolation tools cannot pass through normally. If coiled tubing is used for construction, frequent tripping and tripping are required, which greatly increases the operation cycle and construction cost, seriously affecting construction efficiency and Later production capacity construction