Sand blasting, perforating and fracturing method

Abstract

The invention discloses a sand blasting, perforating and fracturing method which comprises the following steps of: (1) making a continuous oil tube connected with a sand blasting and perforating device pass through a production oil tube to reach a construction target layer; (2) sand-blasting and perforating a first perforating layer until annulus sand fracturing construction is finished; (3) lifting the continuous oil tube to a new perforating layer, and sand-blasting and perforating the new perforating layer until annulus sand fracturing construction is finished; (4) repeating the step (3) until the sanding and fracturing of all perforating layers are finished; and (5) and lifting the continuous oil tube out of the production oil tube. In the sand blasting, perforating and fracturing method, sand blasting and perforating and annulus sand fracturing operations are directly carried out from the production oil tube into the sand blasting and perforating device, the technological links are reduced, production can be performed after lifting out of the sand blasting and perforating device, the well killing operation and entering the production oil tube are unnecessary, and the harm to a reservoir stratum is avoided.

Description

technical field [0001] The invention relates to the technical field of downhole operations for oil and natural gas development, in particular to a sandblasting and perforating fracturing method. Background technique [0002] At present, in oilfield exploitation, for oilfields with low permeability reserves, due to low production capacity and poor exploitation efficiency, it has become the bottleneck in the exploitation of such oilfields. In order to solve the problem of low-permeability oilfield exploitation, sandblasting and perforating fracturing of the wellbore and establishing an effective connection between the wellbore and the formation become the key. The existing sandblasting and perforating fracturing methods mainly include two types: 1. The sandblasting and perforating fracturing technology without moving the string. In sand fracturing, balls of different diameters are thrown to open the perforator to achieve the purpose of layered fracturing. 2. Jet fracturing t...

AI Technical Summary

Problems solved by technology

The above method has the following disadvantages: 1. Sandblasting and perforating fracturing technology without moving the pipe string: (1) the delamination effect is not good; (2) it is easy to cause the risk of sand burying the pipe string

2. Jet fracturing with coiled tubing and sandblasting perforator: it is carried out in the casing, and after fracturing, the production string needs to be re-killed, which will cause damage to the reservoir and reduce production capacity

[0003] It

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