Horizontal well switchable cementing and staged fracturing oil recovery technology

Abstract

The invention belongs to the production process of the petroleum industry, and particularly relates to a switchable cementing segmental fracturing oil production process for horizontal wells, including a floating shoe (1), a constant pressure sliding sleeve (2), and a cementing sliding sleeve segmental fracturing valve One (3), staged fracturing valve for cementing sleeve two (4), staged fracturing valve for cementing sleeve n (5), ball seat one (7), ball seat two (8), ball seat n (9), lost hand, locator one (11), fracturing ball (12), flat-bottomed grinding shoe (13), screw drill (14), check valve (15), packer one (16), seal Spacer 2 (19), locator 2 (17), throttle valve (18), and horizontal well switchable cementing staged fracturing oil production process are as follows: 1. Lowering the completion string; 2. Sending fracturing balls 3. Fracturing; 4. Drilling and removing the ball seat; 5. Closing the sliding sleeve; Quality; high construction efficiency, safe and reliable, suitable for large-scale promotion and use.

Description

Technical field [0001] The invention belongs to a production process in the petroleum industry, and particularly relates to a horizontal well switchable cementing staged fracturing oil production process. Background technique [0002] At present, there are mainly three types of horizontal well completion processes at home and abroad. The first is conventional direct casing cementing completion, string perforation, fracturing tools fracturing, and fracturing tools are proposed after fracturing is completed. , Lower the production pipe string for mining, the water is discharged later, and the water search tool is used to find the water. After the water layer is found, the water plugging pipe string is blocked. This technology has a long construction period from drilling to production. After fracturing, the fracturing tool is difficult to get out, and the well is easy to jam, causing overhaul accidents. Later, the drilling and water blocking tools are cumbersome to construct, and th...

AI Technical Summary

Problems solved by technology

This technology has a long period from drilling to production and construction. It is difficult for the fracturing tool to be removed after fracturing, and it is easy to get stuck in the well, causing overhaul accidents. The construction of the later search and water plugging tools is cumbersome, and it is prone to well stuck accidents, resulting in overhaul accidents.

The second is to use the open hole packer and the sliding sleeve to hang on the technical casing with a hanger. After the hanger is thrown away, the drill pipe is lifted out and then connected back to the cannula and the hanger to connect and seal. The sliding sleeve configured by the open hole packer The inner hole of the sleeve shrinks in diameter step by step from the top to the bottom, which limits the number of fracturing stages. In the later stage, if the open hole packer fails and causes layer channeling, it cannot be treated. Once the water is seriously released, the well will be scrapped

The third is to use solid-injected sliding sleeve fracturing valve to complete the well. The sliding sleeve is connected with the casing and run into the well. After it is in place, the well is cemented. There are two ways of fracturing. One is to use the ball or rubber plug to open the sliding sleeve for fracturing. For valve fracturing, since the sliding sleeve is gradually reduced in diameter from top to bottom, the number of fracturing stages is limited, and the cementing quality of the horizontal section cannot be tested after the completion of cementing. Coiled tubing with a packer is dragged from bottom to top for fracturing. The fracturing construction has strict requirements on equipment and low construction efficiency, so it is not suitable for large-scale use

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