A kind of artificial intervention pulsating water injection method

Abstract

The invention discloses a manual-intervention-type pulsation water injection device. An underground pulsation water injection device comprising a water injection main channel and a pulsation water injection channel is connected in a conventional water injection process pipe string, the water injection main channel and the conventional water injection process pipe string are concentric, the pulsation water injection channel is an energy-storage and high-pressure water-injection channel, and the interior of the pulsation water injection channel is sequentially provided with a pressurization mechanism, an energy-storage mechanism and a pulse control valve from top to bottom. The pulsation water injection method comprises that frequency adjustment of pulsation water injection or closure of pulsation water injection are achieved by placing different blanking plugs, when the blanking plugs are fished out, pulsation water injection is completely started, and starting and closure of manual-intervention-type pulsation water injection and pulsation frequency adjustment are achieved, According to the invention, under the condition that the original water injection process pipe string is not changed, low-frequency high-amplitude pulsation energy is provided for each water injection layer in a unified manner, the flow speed of injected water in the stratum is increased, the sweep efficiency of injected water in a low-permeability, thickened-oil and non-homogeneous oil reservoir is improved, stratum obstruction is eliminated, water injection and oil displacement effect is enhanced, and cost decreasing and benefit increasing are achieved.

Description

technical field [0001] The invention relates to a pulsating water injection technology, in particular to an artificial intervention pulsating water injection device and a pulsating water injection method in which an underground pressurized pulsating water injection tool is combined with a conventional water injection process string. Background technique [0002] At present, water injection development oilfields mostly adopt the water injection method with steady pressure. For the multi-reservoir heterogeneous reservoirs, the water injection development is affected by the permeability difference, resulting in uneven water driving utilization of interlayer reserves, low degree of water driving utilization, and difficulty in relatively poor layers. Use or poor use. The pulsating water injection is guided by the water absorption index, and intermittently controls the intensity of water injection to establish an unstable pressure drop in the reservoir, and promote the development...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a kind of artificial intervention type pulsating water injection equipment and its pulsating water injection method. Pressure pulsation water injection, improve the flow velocity of injected water in the formation and the sweep efficiency in low permeability, heavy oil and heterogeneous reservoirs, eliminate formation plugging, enhance the effect of water flooding, and can be turned on and off according to the needs of the oil field or adjust pulsating water injection

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