An offshore oilfield layered sand control layered water injection integrated pipe string and method

Abstract

The invention discloses a layered sand control and layered water injection integrated pipe string and method in an offshore oil field. The integrated pipe string includes a sand control pipe string and a water injection pipe string. The sand control pipe string and the water injection pipe string are both independent pipe strings. The water injection string is located inside the sand control string, and the upper ends of the sand control string and the water injection string are simultaneously connected to a through-type Y445 hand-off packer. The present invention realizes the requirement of one-step sand control and water injection in offshore oilfields through an integrated overall design, and sets the penetrating type Y445 suspension packer to separate the sand control string from the water injection string to realize the independent inspection and replacement of the water injection string at the later stage, and at the same time Both strings adopt a balanced design to reduce string creep.

Description

technical field [0001] The invention relates to a downhole water injection pipe string for oil exploitation, in particular to an integrated pipe string and a method for layered sand control and layered water injection in an offshore oilfield. Background technique [0002] At present, waterflooding is the dominant development method in offshore. According to incomplete statistics, waterflood production accounts for more than 85% of the total production. High-efficiency waterflooding is of great significance to stabilize and increase production in offshore oilfields. For sand-producing reservoirs, efficient sand control is important for extending the life of the water injection string and reducing the risk of sealing in later operations. At present, for such reservoirs, two processes, chemical sand control and mechanical sand filter sand prevention, are used. In application, the validity period of chemical sand control wells is short. After sand control fails, sand plugging a...

AI Technical Summary

Problems solved by technology

Although the advantages of large well flushing channel and large displacement of the whole wellbore are taken into account, the construction is as in the above document, the sand control pipe string and the water injection pipe string need to be lowered twice, the construction process is cumbersome, and the construction success is relatively high.

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