Method for predicting single-well production allocation and injection allocation based on multi-method fusion

Abstract

The invention discloses a method for predicting single-well production allocation and injection allocation based on multi-method fusion, which forms a set of integral production allocation and injection allocation method from a single well to a block and then to the single well, and determines production allocation and injection allocation of each small layer in the block through production allocation planned to be achieved at the next development moment of the block from actual production dynamic and static data. By means of an improved yield splitting method, production allocation and injection allocation of an injection-production well are achieved by allocating the production allocation and injection allocation to each production well according to the principle of fixed injection and production allocation. Compared with other production and injection allocation methods, the flow can quickly and effectively achieve production and injection allocation of a single well of an oil fieldaccording to the principles of fixed production and injection allocation and fixed injection and production allocation; and meanwhile, each calculation module can be independently used as an independent method to calculate corresponding parameters, including single-well yield splitting, block production allocation and injection allocation, splitting coefficient calculation and single-well liquidquantity fitting. According to the method, problems of block and single-well production allocation and injection allocation can be quickly solved, parameter consideration is complex, and the fitting result is accurate.

Description

technical field [0001] The invention belongs to the field of technical oil field development, and in particular relates to a method for predicting production allocation and injection of a single well based on multi-method fusion. Background technique [0002] Generally speaking, oilfield development will face many difficulties and contradictions in the late stage of high water cut, such as the rapid rise of oilfield water cut and the accelerated decline in production of old wells, which further increases the difficulty of tapping the remaining oil potential. In order to maintain the continuous and stable production of oilfields and adapt the original surface engineering, on the basis of fully considering the development characteristics of heterogeneous oilfields, rationally adjust the liquid production structure of many oilfields to improve the development effect of oilfields, so as to pursue the most considerable economic benefit. At present, there are the following proble...

AI Technical Summary

Problems solved by technology

At present, there are the following problems in the adjustment of liquid production structure: the limitation of well pattern energy makes it more difficult to extract liquid; the complex underground well conditions make it not so easy to tap the potential between layers; the imperfection of the injection-production system also increases the difficulty of liquid volume adjustment

This conventional production splitting method is more applicable to sandstone reservoirs with small production intervals, fewer perforated layers, and weak reservoir heterogeneity; For sandstone reservoirs with long intervals and many perforated layers, the applicability is poor.

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