牛圈湖油田“三低”砂巖油藏注水開發(fā)技術(shù)研究
[Abstract]:With the deepening of oilfield development in China, the proportion of low-grade unconventional sandstone in oilfield development is increasing. Due to poor reservoir physical properties, low original formation pressure, very low natural production of single well, high development difficulty and high cost, this kind of reservoir has the following advantages: poor reservoir physical property, low original formation pressure, low natural output, high development difficulty and high cost. Difficult to stabilize production, has not been able to achieve reserve upgrading and effective use. Xishanyao formation reservoir in Niuquanhu Oilfield is a "three low" sandstone reservoir with low pressure, low permeability and low mobility. It is the first reservoir in Santanghu Basin to be developed on a large scale and the main reservoir produced in Santanghu Basin at present. In the early stage of development, the Xishanyao formation reservoir of Niuquanhu Oilfield adopted the technical train of thought of raising formation pressure by water injection in advance. The high water injection intensity in the early stage resulted in a high proportion of low liquid and high water cut wells in the early stage of oil well putting into operation, and the axial waterway was advancing quickly. The lateral oil well has low fluid flow and obvious directional flow. The distribution of formation pressure is not balanced. The effective pressure displacement can be established along the main direction of sand body distribution, but the effective pressure displacement system can not be established on the side. In this paper, the geological characteristics of Niuquanhu oilfield are systematically studied, and the production characteristics of Niuquan Lake oilfield after waterflooding development are analyzed. It is concluded that the water driving condition of the reservoir is obviously improved and the natural decline is achieved. The water cut rise rate is effectively controlled, the formation pressure is basically kept stable, and the production degree of the profile is improved to a certain extent, but the uneven use of the section, the large difference of water absorption between layers, and the high water absorption ratio of the oil-dry layer have not been completely solved. The main reasons for the poor effect of comprehensive analysis and development are the large injection-production well spacing, the low degree of water drive control, and the low controlled reserves of single well in straight well. In order to improve the status of block development and increase the production of single well effectively, the fine reservoir geological description of Niuquanhu oil field is carried out, the distribution of remaining oil is mastered, and the remaining oil is enriched in the area of remaining oil enrichment, according to the fine reservoir development management. The principles of well pattern infill adjustment and development mode transformation are put forward, and the corresponding development scheme is worked out. Through the field implementation of four development adjustment techniques, such as fine water injection, well pattern perfection, oil well production increase and horizontal well development, the reservoir development effect has been obviously improved, which has certain guiding significance for the development of similar reservoirs.
【學位授予單位】:東北石油大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TE357.6
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