Injection device for multi-reservoir deep profile control and method for realizing deep profile control of oil layers

Abstract

The present invention relates to a multi-reservoir deep profile control injection device and a method for realizing deep oil layer profile control. The multi-reservoir deep profile control injection device includes a ground injection system and an injection well. The ground injection system includes at least two storage tanks, each The first storage tank is connected to the stirring tank, the gear shaft is installed in the stirring tank, and the stirring gear is installed on the gear shaft; the stirring tank is connected to the mainstream oil pipe through the wellhead device; Three shunt oil pipes are formed at the tail of the mainstream oil pipe, one of which is located in the center of the mainstream oil pipe, and a sealing valve is arranged between the main flow oil pipe and the three shunt oil pipes, and the sealing valve is composed of a left sealing valve and a right sealing valve. The three diverting oil pipes extend into the shallow oil layer, the middle oil layer and the deep oil layer respectively, and each diverting oil pipe is also equipped with an eccentric distributor. The invention can realize simultaneous profile control of multiple oil layers, and improves the injection effect of the profile control agent.

Description

technical field [0001] The invention relates to oil field development and oil recovery technology, in particular to an injection device for deep profile control of multiple oil layers and a method for realizing deep profile control of oil layers. Background technique [0002] After the oil field is developed by water flooding and after many years of development, most layers will be in the development stage of high water cut or extra high water cut period. In this stage, the water flooding recovery rate is low, the oil well has a high water cut, and the injected water flows along the high-permeability layer, but the low-permeability layer still has development potential because it is rarely affected by the injected water. The low sweep efficiency of injected water greatly limits the improvement of recovery factor. [0003] Aiming at this current mining problem, the existing injection-production technology proposes a deep profile control technology: the profile control agent ...

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