Device and method for multi-stage layering sand prevention and well completion by one-step pipe column

Abstract

The invention discloses a device and a method for multi-stage layering sand prevention and well completion by one-step pipe column. The device comprises an oil-string casing inserted into a first oil layer, a second oil layer and a third oil layer in sequence, wherein a blind pipe is arranged in the oil-string casing; a pipe column which integrates setting seal and examining seal is arranged inside the blind pipe; release suspension packers, first safety connectors, first sand prevention pipe columns, first isolation packers, second safety connectors, second sand prevention pipe columns, second isolation packers, third sand prevention pipe columns and supporting slips are arranged on the outer side of the blind pipe from the top down in a sleeving way; the upper part of the pipe column which integrates the setting seal and the examining seal is connected with a standard oil pipe; the lower part thereof and the release suspension packers are integrally connected to be a whole; the first sand prevention pipe columns are aligned to the first oil layer; the second sand prevention pipe columns are aligned to the second oil layer; the third sand prevention pipe columns are aligned to the third oil layer; and the supporting slips are mounted at the lower end of the blind pipe and positioned below the third oil layer. According to the invention, the number of layered stages is not limited, so that the setting seal and examining seal operations can be performed at the same time, thereby guaranteeing the seal effect of the packers in all stages and improving the well repairing efficiency.

Description

technical field [0001] The invention relates to a sand control well completion method and device. In particular, it relates to a one-pass multi-stage layered sand control completion device and method that can meet the requirements of offshore oil fields for multi-layered layered sand control technology. Background technique [0002] As a simple sand control completion technology, multi-layer layered hanging filter sand control is widely used in oil and water wells in large unconsolidated sandstone reservoirs. Especially in offshore oilfields, in order to increase the oil production rate, a single well is exploited in multiple layers, and most of the production intervals are more than 3 layers. It is necessary to implement other production processes after layered sand control completion. At present, there are mainly two types of conventional layered sand control technology: one adopts the layer-by-layer construction technology, that is, the construction of one layer is compl...

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of conventional layered sand control technology: one adopts the layer-by-layer construction technology, that is, the construction of one layer is completed, the seal of the first layer is completed, and then the construction is carried out step by step. The diameter is small, which is not conducive to the development of later layered oil recovery or water injection technology; the other one uses a string setting to seal all the sand control tools, but this process does not have the function of seal inspection, and it needs to be run separately for seal inspection tools. In many cases, the construction period is longer and the operation cost is higher

Both of the above two processes adopt anchored packer layering, and the unsealing method is forced lifting and unsealing, which is difficult to unsealing and increases risks for subsequent workover operations. After unsealing failure, it often leads to overhaul operations, which greatly Increased workover costs

Therefore, the conventional layered sand control completion technology cannot meet the needs of rapid and safe production in offshore oilfields. A safer and more effective layered sand control technology is needed, which has a larger inner diameter and can provide oil recovery and water injection in the later stage. Provide adequate completion access

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