东峰场地区陆相地层岩石力学参数分析及应用

发布时间：2018-06-05 22:39

本文选题：川西南 + 岩石力学参数　；参考：《成都理工大学》2015年硕士论文

【摘要】：资阳-东峰场区块位于川西南构造较高部位,是有利的油气聚集区带,是中石化西南局增储上产的重要目标区块,油气勘探开发潜力大;但是资阳-东峰场区块作为勘探开发的新区快,还缺少系统的工程地质研究成果,缺乏设计和施工的科学依据,也严重威胁到增储上产和安全高效生产目标的实现。此外,前期在东峰2、东峰3、东峰6井对须家河组气藏进行储层改造,改造后大部分地层产水,三口井均未取得理想增产效果。而岩石的力学参数是石油钻井、压裂工程设计、构造应力场计算及裂缝预测的基础资料。地层中裂缝的发育以及油田工程中的诸多问题均与岩石的力学性质密切相关。因此,对该区块开展岩石力学参数的应用研究具有重要的现实和经济意义。鉴于岩石力学参数的重要应用价值以及资阳-东峰场区块的勘探开发实际情况的需要,本论文采用室内实验与测井资料分析二者结合的方法,主要针对资阳-东峰场区块的陆相地层(以须家河组地层为研究的重点目标),以该地区的区域地质资料为基础,收集整理了6口井(川7井、川峰188井、东峰2井、东峰3井、东峰6井、资阳1井)的常规测井、成像测井、录井、钻井、压裂数据等资料,通过大量岩心实验,得到了岩石的密度、弹性模量、泊松比、抗张强度、抗压强度、内聚力和内摩擦角等岩石力学参数,明确了储层敏感性特征;结合测井资料,建立了岩石力学参数预测模型,建立了该地区岩石力学参数剖面,分析了力学参数分布规律;根据欠压实理论,优选运用了伊顿法,建立了声波、密度、电阻率测井资料地层压力预测模型和剖面,落实了地层压力纵向分布规律;在此基础上,运用声发射、差应变实验、矿场资料确定了地应力大小和方向,建立了陆相地层坍塌压力、破裂压力剖面,运用GMI地应力建模软件的GMI-Wellcheck(即钻井设计和井筒稳定性分析)模块得到三压力剖面,分析了井壁稳定性;最后在工程地质参数研究基础上,讨论了钻完井过程中安全钻井液密度窗口的确定,欠平衡钻井的可行性,射孔方位的选择,钻井液性能的优化,钻头的选型,以及储层改造过程中缝网的形成条件,优化研究压裂液的优化和压裂工艺的优选等内容。最终提出了适合于该地区钻井、完井以及储层改造方面的技术对策和优化设计方案。通过本论文研究表明:室内实验测定的岩石力学参数和测井资料得出的岩石力学参数具有较好的相关性,依据本论文的研究方法得到的预测结果完全可以满足工程施工的需要;须家河组地层压力存在分区差异,东部川峰188井区压力较低(1.2MPa/100m),北部东峰3井区相对较高(1.5MPa/100m);研究区陆相岩石强度随深度增加趋势明显,自流井上部、须四底部及须三中部地层岩石强度明显大于其它地层,相同层段砂岩强度约是泥页岩强度2倍;研究区最大水平主应力方向主要为近东西向,须家河组方位在106°±10°范围;对于天然裂缝不发育储层,建议采用光套管注入方式施工,应尽量提高施工排量,增加缝内净压力。结合本论文在钻井液性能优化和钻头选型的研究成果,将欠平衡钻井应用到该工区的钻井施工中,钻井速度提高了0.1~0.3m/h;在后期通过储层改造参数的优化,获得了较高的产量。
[Abstract]:The Ziyang Dongfeng field block is located in the southwest of Sichuan Province, which is a favorable zone of oil and gas accumulation. It is an important target area for the Southwest Bureau of Sinopec to increase its storage and production. The potential of oil and gas exploration and development is great, but the Ziyang East peak field block is fast in the new area of exploration and development, and lacks systematic engineering geological research results and lacks of the design and construction section. In addition, in the earlier period, the reservoir of the Xujiahe group gas reservoir was reformed in Dongfeng 2, Dongfeng 3, Dongfeng 6 well, and most of the strata produced water after the transformation, and all three wells had not achieved the ideal increase effect. The mechanical parameters of the rock were oil drilling, fracturing engineering design and construction. The basic data of force field calculation and fracture prediction. The development of cracks in the formation and many problems in the oilfield engineering are closely related to the mechanical properties of rock. Therefore, the application of rock mechanics parameters to this block is of great practical and economic significance. In view of the important application value of rock mechanics parameters and Ziyang East, In this paper, the method of combining indoor experiments and logging data analysis is adopted in this paper, which mainly aims at the continental strata of the Ziyang Dongfeng field block (the key target of the Xujiahe formation). Based on the regional geological data in this area, 6 wells (7 wells in Sichuan, Sichuan peak 188) have been collected and arranged. Well, Dongfeng 2, Dongfeng 3, Dongfeng 6, Ziyang 1 well) conventional logging, imaging logging, logging, drilling, fracturing data and other data, through a large number of core experiments, the rock density, modulus of elasticity, Poisson's ratio, tensile strength, compressive strength, cohesive force and internal friction angle, etc. Well data, the rock mechanics parameter prediction model is established, the rock mechanics parameter section of this area is established, and the distribution law of mechanical parameters is analyzed. According to the theory of under compaction, Eaton method is used to establish the model and section of the prediction of formation pressure in acoustic, density and resistivity logging data, and the vertical distribution law of formation pressure is carried out. On the basis of acoustic emission, differential strain test and field data, the size and direction of ground stress are determined. The collapse pressure and fracture pressure profile of the continental strata are established. The three pressure profile is obtained by using the GMI-Wellcheck (the drilling design and the wellbore stability analysis) module of the GMI geostress modeling software, and the stability of the wellbore is analyzed. Finally, the engineering ground is made. On the basis of the study of the quality parameters, the determination of the density window of the safe drilling fluid during drilling and completion, the feasibility of underbalanced drilling, the selection of the perforation azimuth, the optimization of the drilling fluid performance, the selection of the drill bit, the formation conditions of the seam net in the process of reservoir reconstruction, optimization of the fracturing fluid and the optimization of the fracturing technology are discussed. The technical countermeasures and optimal design schemes for drilling, completion and reservoir reconstruction in this area are proposed. Through this paper, it is shown that the rock mechanics parameters measured by the laboratory test and the rock mechanics parameters obtained by the logging data have good correlation, and the prediction results obtained by this method are completely possible. In order to meet the needs of engineering construction, the formation pressure of the Xujiahe formation is different, the East Sichuan peak 188 well area pressure is low (1.2MPa/100m), the North East peak 3 well area is relatively high (1.5MPa/100m); the strength of the continental rock in the study area increases with the depth obviously, the upper part of the self flow well, the rock strength of the four bottom and the third middle part of the Xujiahe is obviously greater than that of the other The strength of sandstone in the formation and the same layer is about 2 times the strength of shale; the main direction of the maximum horizontal principal stress in the study area is mainly near east-west, and the azimuth of Xujiahe formation is in the range of 106 + 10 degrees; for the undeveloped reservoirs with natural fractures, the construction of the light casing injection method is suggested, and the construction displacement and net pressure should be increased as far as possible. The research results of well fluid performance optimization and drill bit selection have applied underbalanced drilling to the drilling construction in this area, and the drilling speed increased by 0.1~0.3m/h, and higher production was obtained by optimizing the parameters of reservoir reconstruction in the later period.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】