白庙深层低渗凝析气藏水平井挖潜研究

发布时间：2018-03-25 08:56

本文选题：深层　切入点：凝析气藏　出处：《中国地质大学（北京）》2015年博士论文

【摘要】：本论文针对东濮凹陷白庙沙三下气藏，综合应用地震解释、储层预测、油气检测、经济评价等方法与技术，完成了水平井挖潜的地质、工程、经济等方面论证，优化了井型模式和设计参数，提出了有利目标区及井位建议，为探索改善深层低渗凝析气藏开发效果的技术途径提供了重要依据。主要成果和认识如下： 1、通过地震资料二次处理、小层对比、人机连作构造解释、砂体展布结合储层预测研究认为，气藏构造总体落实，，沙三下沉积时期，湖底扇中扇水道发育，在水道内及水道交汇区砂层厚度大、储层物性好，存在6个有利储层分布区，目前资料品质下构造和储层描述精度也可达到设计要求，具有钻水平井的地质条件。 2、采用通过确定气井泄气半径研究气藏井网控制储量的方法，评价了白庙沙三下气藏剩余未井控潜力，气藏未井控地质储量达4.97×108m3，主要集中分布在1、3、5砂组，是钻水平井挖潜的主要目标。 3、对比了目前工艺技术条件与白庙沙三下气藏地质特征，认为目前水平井钻井、轨迹追踪与地质导向、水平井完井、分段压裂技术均较成熟，能够满足气藏地质条件及其对钻完井及压裂技术的要求，套管桥塞压裂、封隔器或固井滑套压裂是适合该气藏分段改造的主要工艺，水平井挖潜在工艺技术是可行的。 4、采用经济评价方法，计算白庙沙三下单井经济极限储量为0.56-0.69×108m3。按气藏条件测算沙三下水平段井控储量可超过0.8×108m3，可以获得经济效益。单井控制经济极限储量与油气价格、凝析油含量等因素密切相关，随着气价上升，效益会更明显，水平井挖潜经济上可行。 5、根据气藏地质特点，兼顾工艺实施的难度与可靠性，提出该气藏水平井可应用阶梯水平井工艺，实现对同一断块中的两个气层或两个断块中的气层的控制，以获得最佳的井控储量，并针对不同断层与储层配置关系，提出了5种水平井部署模式。 6、考虑白庙沙三下层内非均质性特征、地应力分布等，提出水平段在层内的位置应以穿透目标层，保证储层控制程度为最优，水平井最佳轨迹延伸方位在120°-170°，段长600-1000m。综合构造解释、储层展布、物性特征、经济极限及气藏潜力研究结果，在沙三下优选了5个目标区，提出2口水平井位，实施后取得了良好的效果。
[Abstract]:Based on the methods and techniques of seismic interpretation, reservoir prediction, oil and gas detection, economic evaluation and so on, the geological, engineering, economic and other aspects of the horizontal well exploitation are demonstrated in this paper for Baimiaosha Sanxia gas reservoir in Dongpu depression. The well pattern and design parameters are optimized, and the favorable target areas and well location suggestions are put forward, which provide an important basis for exploring the technical ways to improve the development effect of deep and low permeability condensate gas reservoirs. The main results and understandings are as follows:. 1. Through the secondary processing of seismic data, small layer correlation, man-machine continuous structural interpretation, sand body distribution combined with reservoir prediction, it is concluded that the gas reservoir structure is generally implemented, and the middle fan waterway of the sublacustrine fan is developed during the period of the lower sand deposition. There are six favorable reservoir distribution areas in the waterway and the intersection area of waterway. The structure and reservoir description precision can meet the design requirements under the data quality at present, and have the geological conditions of drilling horizontal well. 2. By using the method of determining the gas well leakage radius to study the well pattern controlled reserves of the gas reservoir, the remaining unwell control potential of the Baimiaosha 3 lower gas reservoir is evaluated. The unwell controlled geological reserve of the gas reservoir is 4.97 脳 10 8 m 3, which is mainly distributed in the 1 Li 3 5 sand formation. It is the main target of drilling horizontal wells. 3. The present technological conditions and geological characteristics of Baimiaosha Sanxia gas reservoir are compared. It is considered that the drilling, trajectory tracing and geological guidance, horizontal well completion and fracturing techniques are mature at present. It can meet the geological conditions of gas reservoir and the requirements of drilling, completion and fracturing technology. Casing bridge plug fracturing, Packer or cementing sliding casing fracturing are the main techniques suitable for the segmental reconstruction of the gas reservoir, and it is feasible to tap potential in horizontal wells. 4. By using economic evaluation method, the economic limit reserves of Baimiaosha Sanxiao single well are calculated to be 0.56-0.69 脳 108m3. According to the gas reservoir conditions, the well control reserves in the lower horizontal section of SHA3 can exceed 0.8 脳 108m3, and the economic benefits can be obtained. The single well controlled economic limit reserves and oil and gas prices can be obtained. The condensate oil content and other factors are closely related, with the increase of gas price, the benefit will be more obvious. 5. According to the geological characteristics of the gas reservoir and the difficulty and reliability of the process, it is put forward that the horizontal well of the gas reservoir can be controlled by using the step horizontal well technology to control the two gas formations in the same fault block or the gas reservoir in the two fault blocks. In order to obtain the best well control reserves, and according to the relationship between different faults and reservoir configuration, five kinds of horizontal well deployment modes are put forward. 6. Considering the heterogeneity and the distribution of in-situ stress in the lower layer of Baimiaosha, it is proposed that the horizontal section should penetrate the target layer to ensure the optimal reservoir control. The optimum trajectory extension azimuth of horizontal well is 120 掳-170 掳and the length of section 600-1000m.Synthetical structural interpretation, reservoir distribution, physical property characteristics, economic limit and gas reservoir potential are studied. Five target areas are selected and two horizontal well positions are put forward. Good results have been achieved after implementation.
【学位授予单位】：中国地质大学（北京）
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE372

【参考文献】