低成本地质导向技术在长宁页岩气水平井钻井过程中的应用

发布时间：2018-03-20 09:20

本文选题：长宁区块页岩气　切入点：低成本地质导向技术　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：2008年以来,页岩气藏的勘探开发已逐步成为四川油气勘探的越来越重要的一部分,在国际油价持续走低的行业背景下,如何低成本的开发好四川长宁区块页岩气水平井,尽可能地提高优质页岩钻遇率,成为我们亟待解决的问题。本文首先调研了长宁页岩气地质概况,在对研究区构造概况和地层情况有了较为深入的认识的基础上,对研究区储层进行小层划分,选取水平井钻探的地质导向目标储层;再分别介绍了随钻自然伽马参数导向技术、岩屑伽马能谱录井技术和岩屑元素录井技术(以下简称岩屑特殊录井技术)的原理和小层划分特征,总结出随钻自然伽马单项参数和岩屑特殊录井技术相结合的成本较低的地质导向技术,并在长宁区块多口单井钻探中取得了非常良好的效果,最后预测该技术在未来长宁构造古生界龙马溪组和五峰组页岩气水平井生产过程中具有非常重大的应用。从而改善页岩气井地质导向参数选择困难、准确性不高和成本过高等困难。本论文取得了以下的研究成果:1、将龙马溪组分为二段,并将龙一段分为龙一1亚段和龙一 2亚段,其中,龙一 1亚段又分为4个小层,并选取五峰组、龙一 1亚段的1小层和2小层作为水平井开发的地质导向目标储层;2、随钻伽马参数作为页岩气地质导向的主要参数,能够有效识别龙一 1亚段的1、3小层,并且区别于2、4小层;3、岩屑伽马能谱录井曲线与随钻伽马曲线趋势一致,在水平段钻井中可相互映证,可作为随钻伽马有效补充,在随钻伽马曲线出现异常时可以及时发现问题并解决问题。4、通过岩屑元素录井技术,能够有效区分不同页岩小层,特别是对于单伽马参数不易区分的龙一1亚段2、4小层,元素铝、钾、铁、钙能够有效识别,一定程度上解决单伽马曲线不好判断轨迹上、下穿行的问题,很好的辅助地质导向;5、地震分辨率对于薄层储层的识别具有一定的局限性,但地震深度剖面对于总体地层倾角的预测及变化有一定的作用,可作为地质导向的辅助;6、形成了一套单伽马参数、岩屑伽马能谱录井技术和岩屑元素录井技术相结合的低成本地质导向技术方法,在长宁区块开发中应用效果良好,有效降低了单井开发成本;截止2016年底,用逐步完善起来的低沉本地质导向技术已经成功在长宁页岩气水平井应用超过8个平台,共计54 口井,靶体钻遇率均为95%以上。
[Abstract]:Since 2008, the exploration and development of shale gas reservoir has gradually become an increasingly important part of oil and gas exploration in Sichuan. Under the background of low international oil price, how to develop the shale gas horizontal well in Changning area of Sichuan province at low cost, It is an urgent problem to improve the drilling rate of high quality shale as far as possible. Firstly, the geological survey of Changning shale gas is investigated in this paper, based on the deep understanding of the structural and stratigraphic conditions in the study area. The reservoir in the study area is divided into small layers, the geological guiding target reservoir is selected for horizontal well drilling, and the natural gamma parameter guiding technology while drilling is introduced respectively. The principle and characteristics of rock cuttings gamma spectrum logging and cuttings element logging (hereinafter referred to as cuttings special logging techniques), The low cost geological guidance technology combining natural gamma single parameter while drilling and special logging technology of cuttings is summarized, and a very good effect has been obtained in the single well drilling of many blocks in Changning area. Finally, it is predicted that this technique has a very important application in the production process of shale gas horizontal wells in Paleozoic Longmaxi formation and Wufeng formation in Changning structure, thus improving the selection of geological guidance parameters of shale gas wells is difficult. In this paper, we have obtained the following research results: 1, the Longmaxi component is divided into two sections, and the first segment is divided into Long-1 submember and Long-2 subsegment, among which, the Long-1 submember is further divided into four sublayers. In addition, Wufeng formation, 1 and 2 layers of Long-1 submember are selected as the geological guiding target reservoir of horizontal well development, and gamma parameters while drilling are taken as the main parameters of shale gas geological guidance, which can effectively identify 1 and 3 layers of Long-1 submember. In addition, different from that of No. 2 ~ (4), the trend of cuttings gamma-ray spectrum logging curve is the same as that of "while drilling", which can be used as an effective supplement to gamma while drilling in horizontal section drilling. The problem can be found and solved in time when there is anomaly in the gamma curve while drilling. By means of cuttings element logging technique, different shale layers can be effectively distinguished, especially for the 2Q4 submember of Long-1 submember, which is difficult to be distinguished by single gamma parameters. Elements aluminum, potassium, iron, calcium can be effectively identified, to a certain extent solve the single gamma curve difficult to judge the trajectory of the problem, a good auxiliary geological guidance to 5, seismic resolution for thin layer reservoir recognition has certain limitations. However, the seismic depth profile plays a certain role in the prediction and variation of the overall dip angle, and can be used as a geological guide to assist the formation of a set of single gamma parameters. The low cost geological guidance technology combined with cuttings gamma-ray logging technique and cuttings element logging technology has been applied to the development of Changning block with good results, which has effectively reduced the development cost of single well. The low depth geological guidance technique has been successfully applied in Changning shale gas horizontal well with more than 8 platforms, 54 wells in total, and the target drilling rate is more than 95%.
【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】：TE243

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