A development method for extra-high water-cut reservoirs outside the surface

Abstract

The invention provides a development method of an untabulated reservoir in an extra-high water-cut period. The development method comprises the following steps: acquiring definite geological development characteristics, employing status and water washing characteristics of the untabulated reservoir according to the geology, production and core well monitoring data of the untabulated reservoir; determining whether the untabulated reservoir meets the independent development conditions according to the aforementioned results; treating an independent untabulated reservoir at a forming course encountered in the drilling of an oil-water well as an object, and determining a development manner of the untabulated reservoir according to the distribution features of a tabulated reservoir and the untabulated reservoir; building a productivity evaluation model for the independent development of the untabulated reservoir according to a fracturing technology, stratums and fluid physical property data, providing corresponding technical limits, and developing in a determined surface reservoir development manner, so as to finish the development method of the untabulated reservoir in the extra-high water-cut period. According to the aforementioned development method, the water flooding of the untabulated reservoir in the extra-high water-cut period is effectively employed, thus the basis is provided to the scientific development of the untabulated reservoir, and the purpose of improving the production rate can be achieved.

Description

technical field [0001] The invention relates to a development method for effective production of thin and poor oil layers in ultra-high water-cut multi-layer oil reservoirs, which belongs to oil and gas field development engineering technology. Background technique [0002] Off-surface reservoirs refer to the argillaceous siltstone, silty mudstone and calcium-bearing siltstone reservoirs in the Changyuan multi-layer oil reservoir, which are dominated by oil immersion and oil spots. Poor, the reservoirs in the table are the main oil-bearing reservoirs opposite to them. [0003] After the Daqing Changyuan Lamadian, Sartu and Xingshugang Oilfields ("Laxing" for short) entered the ultra-high water-cut stage, the thin poor layers mainly composed of extrasurface reservoirs have become the main targets of water flooding, and Due to the inefficiency of injected water and the aggravation of ineffective circulation, the remaining oil potential of off-surface reservoirs has become inc...

AI Technical Summary

Problems solved by technology

[0005] For a long time, the layered water injection technology in Daqing Oilfield has been widely used. However, due to the limitation of the volume of the packer and the technology of the measures, the number of sections in the water injection wellbore has approached the limit, and the average production degree of the monitored oil layer is still less than 50%. , It is difficult for the off-surface reservoir with poor physical properties to play a role

The focus of the tertiary well pattern infill in Daqing Oilfield is the off-surface reservoir, but the development effect is poor. For example, the average daily oil production of the tertiary infill wells deployed in Xingshugang Oilfield in 2010 during the ultra-high water cut period was less than 1.5t, and the average water cut was greater than 85%

In addition, due to the dual limitations of the amount of plugging agent used and the mechanism of action, the deep profile control technology for multi-layer thick reservoirs in the ultra-high water cut period is not mature enough

Tertiary oil recovery technologies such as polymer flooding and composite flooding have been widely used in Daqing Oilfield and have achieved good results, but mainly to improve the water flooding sweep efficiency of the main oil layers. Reservoir lack of applicability

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