A Water Accumulation and Separate Injection Device Applicable to Offshore Oilfields

Abstract

The invention belongs to the technical field of layered polymer injection in offshore oil fields, and discloses a water and polymer layered injection device suitable for the offshore oil fields. The water and polymer separate injection device is mainly composed of an upper joint, an outer cylinder, a lower joint and a central adjustment shaft, a central injection channel and a bridge type injection channel are formed to be separately used as a water injection channel and a polymer injection channel; the two channels are separated by a sealing structure and do not interfere with each other andare separately and correspondingly connected to a water injection port and a polymer injection port; and a measuring and adjusting tool is used for controlling a middle adjusting shaft to move axiallyto change injection channels of different media, the opening, closing and injection quantity control over the water injection port and the polymer injection port are realized, and the layered injection and injection quantity adjustment of the different media of polymer and water is realized. The water and polymer layered injection device matched with a multi-tube injection proration process can realize multilayer-section water and polymer layered injection and the injection quantity adjustment of a same well, the problems of different layer sections, different injection media and different injection quantity of polymer injection wells in the offshore oil fields is solved, the water and polymer layered injection device can be used for the underground multilayer-section layered quality andquantity injection of the offshore oil fields, the oil displacement effect of the offshore oil fields is greatly improved, and production costs are reduced.

Description

technical field [0001] The invention belongs to the technical field of layered polymer injection in offshore oil fields, and in particular relates to a device capable of realizing layered injection of different media for water accumulation in a polymer injection well. Background technique [0002] Polymer flooding is an important technical means for offshore oilfields to achieve "increased production and high production". At present, the single-media polymer injection technology used in offshore oilfields is gradually changing from general injection and multi-pipe separate injection to single-pipe layered polymer injection measurement and adjustment technology. , The means of measurement, adjustment and monitoring are gradually changing from mechanization to semi-automation and automation, which realizes fine injection between layers, reduces the influence of heterogeneity between layers, and improves the efficiency of dispensing. However, oilfields have different production...

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Problems solved by technology

[0007] To sum up, at present, the single-medium layer-by-layer measurement and adjustment injection of polymer injection wells in offshore oilfields meets the requirements for layer-by-layer polymer injection deployment, but the layer-by-layer measurement and adjustment injection technology for multi-media and different intervals in the same well still stays at multi-pipe injection, surface injection, etc. The level of adjustment cannot meet the requirements of monitoring and multi-layer separate injection, which affects the efficiency of water accumulation, separate injection and distribution of polymer injection wells

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