热洗井屏蔽暂堵剂及暂堵工艺参数优化研究

发布时间：2018-01-08 22:00

本文关键词：热洗井屏蔽暂堵剂及暂堵工艺参数优化研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：江苏油田韦2断块属于低渗透砂岩油藏,原油平均含蜡较高,油井结蜡是影响该区块整体产量的重要因素之一。采用常规液体热洗的方式对油井进行周期清蜡,洗井液通过射孔炮眼向地层大量漏失,不仅难以建立起洗井循环,并易对近井地带造成伤害。在有效除蜡的同时如何减小洗井液对储层产生的伤害,是目标区块亟待解决的问题。本文以此为出发点,将屏蔽暂堵技术引入到热洗井作业中,对油井射孔段炮眼进行屏蔽暂堵后,再进行热洗井作业,该措施能快速建立起洗井循环,显著减少洗井液在炮眼中的漏失,从而克服常规洗井作业中存在的弊端,达到油层保护的目的。具体内容如下:(1)结合目标区块储层条件,通过室内实验分别对油溶性暂堵剂SA-1体系和固化水暂堵剂SW-13A体系的理化性能进行了评价;比较两种暂堵体系的封堵性和解堵工艺,从简化施工工艺和节约成本的目的出发,优选出适合目标区块热洗井作业的屏蔽暂堵剂。(2)进行了堵剂对炮眼封堵过程的研究,指出内、外滤饼的共同作用,降低洗井液在炮眼内的滤失速率;建立了炮眼封堵模型,并采用差分离散法对模型进行求解;分析了暂堵液颗粒浓度和注入压差对内、外滤饼厚度,液体滤失速率和累积滤失量的影响。(3)根据前期的室内试验和模拟结果,对热洗井作业屏蔽暂堵工艺参数进行了优化设计;并进行了现场试验,验证了热洗井屏蔽暂堵技术的可行性,该措施保护储层效果显著。本论文完成的研究内容以及取得的研究成果,为有效解决常规热洗井清蜡作业存在的问题,提供了有力的技术支持。同时,也为其它作业区块洗井作业提供了技术参考。
[Abstract]:Wei2 fault block in Jiangsu Oilfield belongs to low permeability sandstone reservoir, and the average wax content of crude oil is high. The wax deposit is one of the important factors affecting the overall production of the block. It is difficult to set up a well washing cycle and it is easy to cause damage to the near well zone. How to reduce the damage to the reservoir caused by the well washing fluid while effectively dewaxing. It is an urgent problem to be solved in the target block. In this paper, the shielding temporary plugging technology is introduced into the hot washing operation, and then the hot washing operation is carried out after shielding the hole of the perforating section of the oil well. This measure can quickly set up the circulation of well washing, reduce the leakage of well washing fluid in the hole of the gun, and overcome the disadvantages existing in the routine well washing operation. To achieve the purpose of reservoir protection. The specific contents are as follows: 1) combined with the reservoir conditions of the target block. The physical and chemical properties of oil soluble temporary plugging agent SA-1 system and solidified water temporary plugging agent SW-13A system were evaluated by laboratory experiments. In order to simplify the construction process and save the cost, the two temporary plugging systems are compared in terms of plugging performance and plugging process. The screening temporary plugging agent, which is suitable for the hot washing operation in the target block, is selected to study the plugging process of the plugging agent. It is pointed out that the internal and external filter cake act together to reduce the filtration rate of the washing fluid in the borehole. A plugging model is established, and the differential discretization method is used to solve the model. The effects of particle concentration and injection pressure difference on internal and external filter cake thickness, fluid filtration rate and cumulative filtration rate were analyzed. The optimization design of shielding temporary plugging process parameters for hot washing well operation is carried out. Field tests were carried out to verify the feasibility of shielding temporary plugging technology for heat washing wells. The effect of this measure on reservoir protection is remarkable. The research content and research results achieved in this paper. In order to effectively solve the problems existing in the conventional hot washing well cleaning operation, it provides a strong technical support, and also provides a technical reference for other operation blocks.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE252.9

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