密井网高含水储层压裂技术研究

发布时间：2018-08-17 10:04

【摘要】：扶余油田是一个非均质严重的裂缝性中低渗透浅层砂岩油藏,目前,扶余油田已进入密井网高含水开发阶段,而扶余油田东区由于水油流度比相对较大,开发难度越来越大。压裂一直是扶余油田主体增产措施,压裂效果不理想对扶余东区稳产造成一定影响。因此,综合地质、生产动态、压裂施工等相关资料进行多因素评判分析,进行多参数优化,寻求一种更加适合扶余油田密井网高含水条件下的压裂技术,从而提高压裂增产效果,为扶余稳产具有重要的作用。因此,为了提高单井压后产量,实现该区井稳油控水的目的。本研究首先基于压裂改造产量没有太大变化的井作为参考井,其他压裂改造井与其对比分析,从地质因素和工程因素两个方面分析了影响压裂井改造效果的主次矛盾,从而为选井压裂增产改造提供一定的技术支持。然后建立了近井地带地应力场模型,利用二次压裂理论,得到了扶余东区压裂井的地应力场与储层深度之间的关系模型,为明确后续人工裂缝和天然裂缝之间的相互关系奠定理论基础。其次,建立了人工裂缝和天然裂缝形成最小开启能量力学模型,结合扶余油田东区地应力场模型,得到了扶余油田人工裂缝和天气裂缝开启的临界力学条件。最后综合本论文研究成果,对比扶余油田现行的压裂工艺(全程加砂压裂、二次加砂压裂、压前投球压裂、压中投球压裂)对压后产量的影响,提出了适合于扶余油田密井网高含水条件下的储层压裂改造优化技术。
[Abstract]:Fuyu Oilfield is a fractured low permeability shallow sandstone reservoir with serious fracture. At present, Fuyu Oilfield has entered the stage of dense well pattern high water cut development, while the eastern part of Fuyu Oilfield is becoming more and more difficult because of the relatively large water / oil mobility ratio. Fracturing has always been the main measure to increase production in Fuyu Oilfield, and the unsatisfactory fracturing effect has a certain effect on the stable production in the eastern part of Fuyu. Therefore, comprehensive geological, production performance, fracturing operation and other related data are analyzed by multi-factor evaluation and multi-parameter optimization, in order to find a more suitable fracturing technology under the condition of dense well pattern with high water cut in Fuyu Oilfield. In order to improve the effect of fracturing, it plays an important role in Fuyu stable production. Therefore, in order to improve the production after single well pressure, the purpose of stabilizing oil and controlling water in this area is realized. Firstly, based on the wells with no great change in fracturing production, the main and secondary contradictions affecting the effect of fracturing wells are analyzed in terms of geological factors and engineering factors through the comparative analysis of other fracturing wells. Thus, it can provide certain technical support for fracturing and improving well selection. Then the model of in-situ stress field in the near well zone is established, and the model of the relationship between the in-situ stress field and reservoir depth of the fracturing well in the eastern area of Fuyu is obtained by using the secondary fracturing theory. It lays a theoretical foundation for clarifying the relationship between artificial fracture and natural fracture. Secondly, the minimum open energy mechanics model of artificial fracture and natural fracture is established, and the critical mechanical conditions of artificial fracture and weather fracture are obtained by combining with the model of ground stress field in the eastern part of Fuyu Oilfield. Finally, by synthesizing the research results of this paper, the effects of the current fracturing techniques (whole sand fracturing, secondary sand fracturing, pre-press ball fracturing, mid-pressure ball throwing fracturing) on the post-pressure production in Fuyu Oilfield are compared. The optimization technology of reservoir fracturing under the condition of dense well pattern and high water cut in Fuyu Oilfield is put forward.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.1

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