Open hole packer, acid fracturing tubular column and open hole acid fracturing method

Abstract

The invention provides an open hole packer, an acid fracturing pipe column and an open hole acid fracturing method. The open hole packer comprises a central pipe, a sealing and pressing rubber sleeve, an anchoring part and an unsealing part. The sealing and pressing rubber sleeve comprises an inner rubber sleeve, a rigid supporting sleeve and an outer rubber sleeve. The anchoring part and the deblocking part are connected to the two ends of the rigid supporting sleeve; the anchoring part of the anchoring component wraps the outer side of the end of the outer rubber barrel, and the unsealing component abuts against one end of the outer rubber barrel. The acid fracturing pipe column comprises a telescopic pipe, a hydraulic anchor, a releasing device, a throttling nipple, a guide shoe and the open hole packer, wherein the releasing device, the open hole packer, the throttling nipple and the guide shoe are all aluminum alloy components. The open hole acid fracturing method comprises the steps that an acid fracturing pipe column is put down, and slurry is cyclically replaced; setting an open hole packer for open flow production; releasing by a releasing device, and lifting a pipe string at the upper part of the releasing device; and drilling and grinding the releasing device and components at the lower part of the releasing device, and starting the pump for circulation. The packer has the advantages that the packer loss risk is reduced, the unsealing operation is convenient, the workover operation efficiency is improved, and the like.

Description

technical field [0001] The invention relates to the field of oil and gas well stimulation reconstruction, in particular to an open hole packer, an acid fracturing string and an open hole acid fracturing method. Background technique [0002] Open-hole acid fracturing is one of the important measures to increase production in the development of carbonate rock blocks, and it is necessary to communicate fractures and caves through acid fracturing before putting into production. Open-hole acid fracturing usually adopts the method of sealing up and pressing down. This fracturing method can effectively improve the conductivity of the reservoir, increase the production of production wells or the injection rate of injection wells. However, as the well depth continues to increase, the drilled formations are also more complex, which makes the existing open-hole packer have a high probability of losing seal in the complex environment of deep wells during acid fracturing; However, once ...

AI Technical Summary

Problems solved by technology

However, as the well depth continues to increase, the drilled formations are also more complex, which makes the existing open-hole packer have a high probability of losing seal in the complex environment of deep wells during acid fracturing; However, once the acid fracturing string of the packer is stuck or buried, the treatment methods are very limited, which makes the acid fracturing string unresolved frequently, and can only be removed by salvage or milling after throwing away. This leads to problems such as difficult workover after stuck / buried pipe strings, heavy workover workload, and high later workover costs

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