Pressure-adjustable uniform-dryness layered steam distributing tool

Abstract

The invention discloses a pressure-adjustable uniform-dryness layered steam distributing tool, and relates to pressure adjusting steam distributing tool. The tool solves the problems that during the steam injection process, under change of the pressure, the steam dryness is not distributed uniformly; the pressure cannot be adjusted to allow the designed steam amount to go into the target oil layer, the steam injection effect is bad, and the oil-steam ratio is low. A swirler is mounted at the upper part inner wall of an outer pipe; a distributer comprises a distributer disk, a plurality of pistons and a plurality of springs, wherein the distributor disk is welded on the inner wall of the outer pipe; the upper end of the inner pipe is welded on the distributer disk; the part on the distributor disk corresponding to the inner pipe is defined to be a round area; the part except the round area on the distributer disk is defined to be an annular area; a plurality of reversed circular cone steam distribution holes are uniformly formed in the round area and the annular area; pistons and springs are arranged from top to bottom inside each reversed circular cone steam distribution hole; the upper ends of the springs are welded on the pistons; and the lower ends of the springs are welded on the walls of the reversed circular cone steam distribution holes. The tool can be used for steam injection oil recovery.

Description

technical field [0001] The invention relates to a pressure-regulating steam distribution tool, in particular to a pressure-adjustable average dryness layered steam distribution tool, which belongs to the technical field of oil extraction. Background technique [0002] With the development of industry, China's current crude oil output can no longer meet the needs of national economic development, so it is of great strategic significance to continue to economically and effectively develop heavy oil resources. At present, a large number of heavy oil reservoirs have been discovered in Liaohe, Shengli, Dagang, Xinjiang and other regions in my country. The production technologies such as steam injection, steam gravity-assisted oil drainage, and burning oil layers have been mainly used to greatly increase production. Among them, steam injection thermal recovery has become one of the effective technologies for heavy oil production. However, in the initial stage of this technology, s...

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Problems solved by technology

However, this layered uniform steam distribution technology has disadvantages: First, it does not consider the pressure difference between the upper and lower oil layers, or ignores the pressure change of the upper and lower layers caused by the pressure change of the oil layer in the later stage of injection, resulting in the actual amount of steam entering the oil layer cannot enter the oil layer according to the design The second is that the distribution of steam dryness is not considered. Due to the gravity separation of steam, the dryness of steam entering each layer is different, and finally the production degree of each layer cannot be effectively improved, and the oil-steam ratio is still low.

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