Subsection well completion system of bottom water reservoir horizontal well

Abstract

The invention discloses a subsection well completion system of a bottom water reservoir horizontal well, in particular to a special well completion system for a horizontal well, belonging to the field of petroleum drilling well completion. The invention aims to provide a well completion system for reducing the pressure drop rate, stabling oil, controlling water, preventing sand, blocking water, improving the oil extraction rate and reducing the well completion expense. A release joint at the root end of the horizontal well is connected with a first section of novel flow-controlling sieve tube; a novel flow-controlling sieve tube section and a casing section are alternated; a packer is arranged between the novel flow-controlling sieve tube section and the casing section; a safe joint is arranged behind a first sieve tube of the novel flow-controlling sieve tube section; a plug is arranged at the tail end of a well completion tubular column; and spring centralizers keep away from the packer and are arranged on the whole well completion tubular column at equal interval. The key part is the novel flow-controlling sieve tube. The technical scheme has the essential points that subsection well completion is implemented on the bottom water-oil reservoir according to the oil reservoir characteristics and a borehole track. The invention has the characteristics of reducing pressure, stabilizing oil, controlling water, preventing sand, improving the recovery ratio and having high economic performance and is applicable for well completion of the bottom water reservoir horizontal well.

Description

technical field [0001] The invention relates to a well completion system for horizontal well completion in bottom water reservoirs, specifically, a well completion system for reducing the pressure drop rate of oil layers, stabilizing oil, controlling water, shutting off water, preventing sand, improving recovery, The utility model relates to a horizontal well completion system for reducing the well completion cost, which belongs to the special well completion system for the horizontal well in the petroleum drilling field. Background technique [0002] With the continuous improvement of horizontal well drilling technology, horizontal wells have obvious advantages in increasing single well production, increasing single well controlled reserves and improving oil recovery. Horizontal wells have become the first choice for foreign oil reservoir development. Domestic oilfield companies such as CNOOC, Shengli Oilfield and Tarim Oilfield continue to implement horizontal well drilli...

AI Technical Summary

Problems solved by technology

Although this system shows good adaptability in theory and practical engineering application, the cost of this well completion system is expensive, and the cost per unit length of high-quality screen is several times, even ten times, that of ordinary casing , it is obviously not the best choice from an economic point of view to use this completion string system for horizontal wells with medium to low production

[0004] The national invention patent blind pipe with external packer combined with screen pipe completion method and device (public date: December 19, 2007, publication number CN 101089360A) applied by Xiong Youming and others was applied in several horizontal wells of CNOOC South China Sea It is used for bottom water control and sand control, but the disadvantage of this completion method is that it cannot effectively realize the balanced control of fluid, and it is difficult to balance the pressure drop in each screen section, which cannot achieve the function of ICD

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