沥青质沉积对油井产能影响的模拟分析——以南海北部湾盆地W-1油田为例

发布时间：2019-02-22 16:48

【摘要】：油田开发过程中油藏压力、温度等变化会导致原油中沥青质析出并沉积,从而对储层造成伤害并使油井产能降低。以南海北部湾盆地W-1油田为例,利用油藏数值模拟方法模拟了衰竭式开发及注水开发方式下沥青质析出与沉积的过程以及对油井产能的影响情况。由于采油井近井地带压力下降幅度最大,沥青质析出与沉积现象最为显著,造成原油黏度升高和渗透率下降的幅度也最大,从而导致油井产能下降。通过模拟分析,提出了针对由于压力下降导致的沥青质沉积伤害的主要开发对策:一是降低采油井生产压差,如采油井采用小排量生产或者水平井开发;二是提高采油井附近的能量补充速度,如注水井超注、加密注采井距等。基于模拟分析认识提出的水平调整井方案已在W-1油田实施,并取得了一定的增产效果。
[Abstract]:The changes of reservoir pressure, temperature and so on in the development of the oil field can lead to the precipitation and deposition of the asphaltenes in the crude oil, thus causing damage to the reservoir and reducing the production capacity of the oil well. Taking the W-1 oil field in the Beibu Gulf Basin of the South China Sea as an example, the process of the precipitation and deposition of the asphaltene and the effect on the productivity of the oil well are simulated by the numerical simulation method of the reservoir. As the pressure drop in the near-well zone of the production well is the largest, the precipitation and deposition of the asphaltenes are the most significant, resulting in the increase of the viscosity of the crude oil and the decrease of the permeability, leading to a decrease in the production capacity of the oil well. Through the simulation analysis, the main development countermeasures for the damage of the asphaltene deposition caused by the pressure drop are put forward: one is to reduce the production pressure difference of the production well, such as the small displacement production or the development of the horizontal well in the production well, and the second is to increase the energy supplement speed in the vicinity of the production well, such as the injection well super-injection, the encryption and injection well distance, and the like. The proposed horizontal adjustment well scheme based on the simulation analysis has been carried out in the W-1 oil field, and a certain yield increase effect has been obtained.
【作者单位】：中海石油(中国)有限公司湛江分公司;
【基金】：中海石油(中国)有限公司综合科研项目“海上在生产油气田挖潜增效技术研究(编号:CNOOC-KJ 125 ZDXM06 LTD03 ZJ 12)”部分研究成果
【分类号】：TE53

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