澤70高溫?cái)鄩K油藏深部調(diào)剖技術(shù)研究
[Abstract]:Ze 70 high temperature fault block in Huabei Oilfield is a multilayer sandstone structural reservoir affected by lithologic factors. The viscosity of crude oil is high and the formation temperature is high. With the development of exploitation, there are many problems at present. After systematically analyzing the profile control of some water injection wells in Ze 70 over the years, it is found that the profile control agent injection process does not meet the requirements, the compatibility of the plugging agent with the formation is poor, the strength is low, the temperature tolerance is poor, the salt resistance is poor, and the fracture is easy to be lost, and so on. These problems make the water injection pressure drop faster after the measures, and the oil quantity increases in a short period of time, and then drops down quickly. At the same time, there are some problems, such as poor profile improvement, serious well effluent and low economic benefit, etc. In view of the above problems, we think that the present profile control agent and profile control technology can not meet the profile control needs of Ze 70 fault block. Therefore, it is necessary to improve the existing technology and train of thought. On the basis of the research on the distribution of remaining oil, the comprehensive treatment technology of the block is carried out, and a new type of polymer gel with high temperature and salt resistance is proposed. With the use of slowly expanding high strength particles and oil displacement surfactants, the original deep profile control technology was improved, and the polymer injection method of low pressure and small displacement combined slug was adopted. Finally, this paper selects a group of typical injection wells with serious problems in Ze 70 fault block. After using the profile control system developed above, the water absorption profile shows that the upper layer with good physical properties is blocked. The lower layer with poor physical properties was started. The water cut of the well group corresponding to this well decreased from 78.4% before the measure to 68.5% at present, and the daily oil gain was 3.9 t, and the water absorption index decreased 63.6% after the measure compared with that before the measure. The results show that the system can adapt well to the reservoir characteristics of Ze 70 high temperature fault block, can effectively improve the water absorption profile of water injection wells, and the interlayer contradiction has been alleviated preliminarily, and the corresponding oil wells have also achieved better effect of increasing oil and reducing water. Therefore, we think that the profile control system can solve the problem of multiple rounds profile control in Ze 70 fault block, and it has an extremely important guiding significance for the profile control operation of water injection wells in this block in the future.
【學(xué)位授予單位】:西安石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:TE347
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