Open hole horizontal well completion and fracturing integrated string

Abstract

An integrated tubular column for conducting well completion fracturing on an open hole horizontal well comprises a butt joint oil tube, drilling liner hangers, a plurality of fracturing structures, packers, differential pressure sliding sleeves and a float shoe, wherein the butt joint oil tube, the drilling liner hangers, the fracturing structures, the packer, the differential pressure sliding sleeve and the float shoe are mutually connected. Each fracturing structure is formed by a water packer and a hole shrinkage sliding sleeve, wherein the water packer and the hole shrinkage sliding sleeve are mutually connected. The hole shrinkage sliding sleeves comprise upper connectors, outer sleeves and lower connectors, wherein the upper connectors, the outer sleeves and the lower connectors are mutually connected. Hole shrinkage mechanisms and locating mechanisms penetrate through the outer sleeves, the hole shrinkage mechanisms are provided with upper sliding sleeves and lower sliding sleeves, wherein the upper sliding sleeves and the lower sliding sleeves are mutually connected, push rods penetrate through the upper sliding sleeves, and telescopic ball seats are arranged between the push rods and the lower sliding sleeves. The locating mechanisms are provided with connecting cylinders, sliding cylinders and bases penetrate through the connecting cylinders, locating rods and pistons are clamped between the bases and the connecting cylinders, and the upper ends of the sliding cylinders are clamped in clamping slots of the locating rods. According to the integrated tubular column for conducting well completion fracturing on the open hole horizontal well, the multiple hole shrinkage sliding sleeves can be arranged, the hole shrinkage sliding sleeves with a plurality of layers and sections can be opened by balls with the same diameter, so that the requirement for transforming multiple zones of a horizontal well section is met, and the integrated tubular column is simple in structure, and convenient to install and construct.

Description

technical field [0001] The present invention relates to an oil field well completion and fracturing integrated pipe string, in particular to an open hole horizontal well completion and fracturing integrated pipe string for oilfield open hole horizontal well completion and fracturing. Background technique [0002] At present, open hole horizontal wells in oilfields mainly use "open hole packer + step-by-step ball sliding sleeve" fracturing strings for well completion and fracturing. For example, Chinese Patent No. 200920248979.9 provides an integrated pipe string for horizontal well completion and fracturing production, which mainly consists of a safety valve, hydraulic anchor, plug-in sealer, liner suspension sealer, liner, expandable open hole packer, It consists of a ball-pitching sleeve, a pressure sleeve and a floating shoe sleeve. The completion and fracturing process is as follows: First, after drilling and completion, the drilling string is connected to the integrated...

AI Technical Summary

Problems solved by technology

[0004] 1. Most of the open hole packers in the horizontal well completion, fracturing and production integrated strings use mechanical compression packers. The setting principle is to push the packer piston to realize the sealing of the oil casing annulus by the hydraulic pressure in the string. Setting seal, which has many mechanical parts, is easy to sand stuck; and, due to the limitation of the rubber tube material used in the open hole packer, it is not suitable for sealing irregular open hole sections

[0005] 2. The size of the pitching sleeve is limited by the size of the pitching ball. In order to meet the opening of the pitching sleeve at different positions in the horizontal well, the pitching size needs to be increased step by step.

When multiple oil layers in the horizontal well section are stimulated and fractured, the size of the multiple ball sliding sleeves installed on the integrated fracturing and production string of the horizontal well will gradually increase with the increase in the number of oil layers. However, the size of the ball sliding sleeve cannot be increased indefinitely, which will cause the size of the horizontal well fracturing string to increase, which will not only increase the production operation cost, but also increase the operation risk. Therefore, the existing horizontal well fracturing The ball-throwing sleeve used on the cracked pipe string cannot meet the requirements for fracturing multiple oil layers, and it cannot meet the needs of the current oil and gas field development

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