Open-hole horizontal well sectional multi-cluster uniform acidizing tubular column and acidizing method thereof

Abstract

The invention discloses an open-hole horizontal well sectional multi-cluster uniform acidizing tubular column and an acidizing method thereof. On the technical basis of existing open-hole horizontal well sectional acidizing process, throwing ball opening type multi-cluster slide sleeves are introduced, namely a plurality of multi-cluster slide sleeves are mounted in each packing section, all multi-cluster slide sleeves are opened step by step in the packing section by throwing a ball, and meanwhile, multi-point liquid inlet channels can be provided by matching with the standard throwing ball opening type slide sleeves. The acidizing method is a novel technology which acidizing and deblocking a horizontal well, acid liquid is uniformly distributed and acidized in sections of the horizontal well by combined use of the multi-cluster slide sleeves and the standard throwing ball opening type slide sleeves, the problems about blockage and pollution of oil wells are sufficiently solved, seepage of the horizontal well is improved and productivity of the oil wells is increased.

Description

technical field [0001] The invention belongs to the technical field of segmented acidizing of open-hole horizontal wells, and in particular relates to a segmented multi-cluster uniform acidizing string of an open-hole horizontal well and an acidizing method thereof. Background technique [0002] The staged acidizing technology of open hole horizontal wells is an organic combination of well completion technology and acidizing technology, forming a string to realize two processes of well completion and acidizing stimulation. The construction cost is reduced, and the cementing and perforating operations are not carried out in three openings, which greatly improves the completion operation time, and the cementing operation is not carried out in three openings, which effectively solves the problem of poor cementing quality in horizontal wells. However, when acidizing reservoirs with long intervals of horizontal wells, it is difficult to uniformly distribute and discharge acid in ...

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Problems solved by technology

[0003] The above-mentioned process can accurately control the amount of liquid injected into each layer, but its disadvantage is that for a long separation section, due to the limitation of the number of liquid outlets, the location of the acid distribution is concentrated, and the acid cannot enter the target layer evenly according to the design requirements, and local Excessive acid absorption and excessive dissolution at the location will easily cause the reservoir to collapse. At the same time, excessive acid will inevitably cause flowback difficulties, which will cause secondary damage to the reservoir and reduce the acidification effect

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