朝阳沟油田长49-1区块开发布井方案及评价要求研究

发布时间：2018-03-05 01:16

本文选题：长49-1区块　切入点：低渗透油藏　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：朝阳沟油区是受构造、岩性、断层诸多因素控制的复合型特低渗透油藏,油层物性、原油物性、油气水分布以及裂缝发育程度等在油田不同区域差异很大。从开发至今近几十年的勘探开发历程中,不同区块表现出不尽相同的开发状况,但都已进入高含水后期,油水分布零散、剩余油的挖潜愈加困难。稳产是油田开发开采的基本需求,那么当前对低渗透、特低渗透油藏的精细认识及开发方案的优化就变得尤为重要。大庆外围油田砂体规模小而断层密集、油水分布情况复杂多变,目前境内对于低渗透油藏研究依久不成熟。在机理性方面,就特低渗透油田开发开采方面还没有成型而完善的理论作为支撑。如何在能源极度危机的今天,在可观经济效益内设计优化井网加密方案,提高低渗透、特低渗透储层油区采收率便成当务之急。研究区是大庆外围油田中开发最早的特低渗透油藏,通过对研究区块的地质特征、动态产能的综合认识、紧邻北部已动用区块的开发效果、超前注水技术的应用以及较成熟的水平井开发方案,综合分析可知研究区剩余油开发潜力颇大。笔者以构造、沉积和井-震结合预测砂体等精细地质研究成果为指导,结合探井、评价井试油成果和邻近开发区产能动态情况,以及水平井开发技术为引领,进行开发区井位布署。取得了如下结论和认识:1.以地质特征和油藏概况为基础,以前人沉积微相、井震联合技术、构造精细解释研究成果为指导,联合本区试油效果,周边已开发区带动态产能、已动用井区开发效果、超前注水的应用,以油藏工程设计和相关数模研究,综合表明此部署方案设计实用性高。2.长49-1区块扶余油层单井有效厚度均值为4.1m,采油强度0.37t/d·m,稳定产油1.4吨每天,水平井扶余油层产量预测在最小4.2吨、最高7.0吨每天。3.联合地应力、人工裂缝、周边区块动态分析,认为在与主应力方向垂直的方向是水平井段部署的方位,即北西向15°。4.以井震结合方法构造精细解释预算砂岩厚度为基准,参照水平井井位部署原则,以河道砂体较好的FI2小层主力油层为优选区,编制水平井5口,11口直井。5.长49-1区块部署开发设计井33口,7口水平井、26口直井(15口油井、11口水井),水平井与直井联合开发早期阶段日产油单井按7吨每天、1.4吨每天计算成功钻遇率以0.96、生产时率以300d,计算工作区可建产能20.16万吨。6.参照经济评价参数评价标准,当油价为80美元每桶时,内部收益率为21.57%,财务净现值2376.54万元。扶余油层百万吨产能建设投资规模为61.13亿元,经济效益可观。
[Abstract]:The Chaoyang Gou oil area is a complex type of ultra-low permeability reservoir controlled by structure, lithology and faults, with reservoir physical properties and crude oil physical properties. The distribution of oil, gas and water and the degree of fracture development are very different in different regions of the oilfield. In the exploration and development history of recent decades, different blocks show different development conditions, but all of them have entered the late stage of high water cut. The distribution of oil and water is scattered, and it is becoming more difficult to tap the potential of the remaining oil. Stable production is the basic requirement for oil field development and production. The fine understanding of ultra-low permeability reservoir and the optimization of development plan become particularly important. The sand body in Daqing peripheral oil field is small and fault-dense, and the distribution of oil and water is complex and changeable. At present, the research on low permeability reservoirs in China is immature. In terms of mechanism, there is no well-formed and perfect theory on the development and production of ultra-low permeability oil fields. It is urgent to design and optimize the well pattern infill scheme in order to improve the low permeability, which is the earliest ultra-low permeability reservoir developed in the peripheral oil field of Daqing. Through the comprehensive understanding of the geological characteristics and dynamic productivity of the studied blocks, the development effect of the developed blocks in the north, the application of the advanced water injection technology and the mature development plan of horizontal wells are discussed. The comprehensive analysis shows that the potential of remaining oil development in the study area is quite great. The author, guided by fine geological research achievements such as structure, sedimentation and well-earthquake prediction of sand bodies, and combined with exploration wells, evaluates well test results and productivity performance of adjacent development zones. As well as horizontal well development technology as the guide, well location deployment in the development zone has been carried out. The following conclusions and understandings have been obtained. 1. Based on geological characteristics and reservoir profiles, the previous research results on sedimentary microfacies, well and earthquake combination, and structural fine interpretation have been guided. Combining the effect of oil testing in this area, the surrounding development zone with dynamic productivity, the well area development effect, the application of water injection ahead of time, reservoir engineering design and related mathematical model study, The results show that the design of this deployment scheme has high practicability. The average effective thickness of single well in Fuyu reservoir in Chang49-1 block is 4.1 m, the oil recovery intensity is 0.37 t / d 路m, the stable oil production is 1.4 tons per day, and the prediction of Fuyu reservoir production of horizontal well is at least 4.2 tons. Combined with in-situ stress, artificial fractures, and dynamic analysis of surrounding blocks, it is considered that the direction perpendicular to the principal stress direction is the orientation of the horizontal well section. That is, NW heading 15 掳. 4. Based on the fine interpretation of the estimated sandstone thickness by the method of well and earthquake, referring to the principle of horizontal well location deployment, the main oil layer of FI2 small layer with good channel sand body is used as the optimal selection area. 5 horizontal wells, 11 vertical wells .5.5.33 development wells, 7 horizontal wells, 26 horizontal wells, 15 oil wells, 11 wells, 11 wells, in the early stage of the combined development of horizontal wells and vertical wells, the daily production per day is 1.4 tons per day at the early stage of joint development of horizontal wells and vertical wells. The successful rate of drilling is 0.96 and the rate of production time is 300 days. The construction capacity of the working area is calculated to be 201,600 tons. 6. With reference to the evaluation criteria of economic evaluation parameters, When the oil price is $80 per barrel, the internal yield is 21.57 yuan and the financial net present value is twenty-three million seven hundred and sixty-five thousand and four hundred yuan.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE324

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