Small-hole fracturing string and application method thereof

Abstract

The invention relates to the field of oil extraction equipment, in particular to a small-hole fracturing string and an application method thereof. The small-hole fracturing string comprises a safety connector. A hydraulic anchor is threadedly connected below the safety connector. A sliding sleeve sandblaster is arranged below the hydraulic anchor. Packers are arranged at the upper end and the lower end of the sliding sleeve sandblaster. The packer at the upper part of the sliding sleeve sandblaster is threadedly connected with the hydraulic anchor. The lower end of the packer at the lower partof the sliding sleeve sandblaster is connected with a lower direct injection machine. A flow guide groove is formed in the outer edge of the anchor body of the hydraulic anchor to guarantee large flow amount. When the packers work, fracturing fluid can block large gravel grains inside when passing a kerf, the large gravel grains are prevented from entering a center cylinder and a rubber cylinderand influence retraction of the rubber cylinder and cause well blocking. According to the sliding sleeve sandblaster, a second groove hole and a first groove hole are in the state with the outlet upwards obliquely, and therefore erosive wear to the inner edge of a casing pipe caused by the fracturing fluid flowing through the second groove hole and the first groove hole is reduced.

Description

technical field [0001] The invention relates to the field of oil production equipment, in particular to a slim hole fracturing string and a method for using the same. Background technique [0002] Due to low-permeability oil reservoirs generally of poor grade and difficult to produce, development contradictions are becoming more and more prominent, it is becoming more and more urgent to effectively produce remaining oil and fully tap the reservoir potential, actively respond to the requirements of cost reduction, efficiency increase, safety and environmental protection, and comprehensively consider reducing drilling engineering , Surface pipe network engineering investment and other factors, the old well sidetracking technology is increasingly valued. Oilfields such as Changqing and Tuha in China have begun to explore. Due to the limitation of small hole diameter, it is difficult to match the fracturing string, the risk of pipe sticking is high, and the later operation is co...

AI Technical Summary

Problems solved by technology

Oilfields such as Changqing and Tuha in China have begun to explore. Due to the limitation of small hole diameter, it is difficult to match the fracturing string, the risk of pipe sticking is high, and the later operation is complicated, so the technology is generally in the exploration stage. The string is immature, so there is an urgent need for a slim hole fracturing string with good performance, long service life, and the ability to prevent well sticking

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