矿权叠置区内多层系致密气藏有利区评价及集群化井位部署研究

【作者】 武力超；

【导师】 朱玉双；

【作者基本信息】 西北大学 ， 矿产普查与勘探， 2017， 博士

【摘要】 鄂尔多斯盆地主要赋存石油、天然气、煤炭和砂岩型铀矿等多种能源矿(藏)。受控于构造和沉积演化等多重因素,煤炭与天然气大范围叠置,在我国现行矿业权设置机制下,因资源需求的迫切性和经济利益分配失衡,矿权叠置问题突出。长期以来,如何高效开发矿权叠置区内被压覆的天然气资源并且避免安全隐患问题一直是合理高效开采能源的世界性难题,迄今缺乏系统的开发技术研究。为此,选取煤炭和天然气矿权完全叠置的神木气田作为研究对象,对比分析煤炭开采和天然气藏开发的特点,并在梳理协同开发难点的基础上,提出基于集群化井位部署的协同开发规划,开展上古生界气藏和下古生界气藏有效储集层的主控因素分析和有利区分布规律研究,评价出有利区平面分布特征,开展井网井型论证,形成四种集群化井位部署模式,通过现场实践取得显著效果,并进一步明确了仍需攻关的协同开发配套工艺。通过研究,提出了“五不同、三统一、整体推进”天然气藏开发理念,建立新的矿权叠置区资源协同开发基本原则,明确了协同开发的难点与规划,运用集群化井位部署、通过时间和空间的错位,分区域和分批次可实现研究区内煤炭与天然气协同开发。基于单砂体为目标的精细地层格架和砂体展布规律研究,确定出研究区储集层空间展布特征,结合成藏主控因素分析,进行有利区评价及分区、多方法优化井网井型,确定适合不同分区的集群化立体式丛式井组部署模式,研究区内多层系致密气藏有效储集层平面上可划分为上古生界有效储集层多边式叠合区、上古生界有效储集层多层式叠合区、上古生界有效储集层孤立式发育区、上下古生界有效储集层叠合发育区。首次结合经济评价进行井网井型优化,结果表明,9井丛井组是最合理的井网模式,并依据不同的储集层分区形成四种“大丛式混合井组、多层系立体开发”模式。后续研究的重点应集中在多井型大井组快速钻井、多层分压工艺、流水线集中压裂、丛式井组采气等技术和地面采气管网串接、设备撬状化、管理数字化等协同开发配套工艺。实践证明,矿权叠置区内多层系致密气藏有利区评价和集群化井位部署不仅实现矿权叠置区内被压覆的天然气资源的安全高效整体开发,又可减少对叠置区范围内煤炭资源开发的影响,是有效解决矿权叠置问题重要技术方法。更多还原

【Abstract】 Oil,natural gas,coal and sandstone～type uranium deposit were abundance in Ordos Basin.Coal and natural gas formations overlap in the longitudinal direction and also intersect in the plane,due to the mineral～right setting mechanism in mineral～right division legislative system,the interest pattern imbalanced.For a long time,collaborative development of coal and nature gas in multi～mineral overlapping blocks with avoiding the insecure problems is looked at the world’s issues,which have long been difficult to study.So far,the research in the academia focused on collaborative explorement technology and lacks to study in collaborative development.Therefore,the coal～natural gas overlapping region is taken as an example to clarify the difficulties in collaborative exploitation and analyze the main controlling factors and distribution pattern of favorable areas in the Upper and Lower Paleozoic gas reservoirs.The technical measures of different areas have been optimized by combining well type～pattern demonstration with efficient drilling～producing and surface gathering～transportation technology to reduce the impact of natural gas development on coal resources and shorten gas reservoir construction and development cycles.This technique has been very successful for the site application.The following conclusions were obtained.We firstly proposed the natural gas development philosophy of "five different concepts、three unite system、overall advance development progress～.According to the principle of～time staggering,space division,safety first,mutual coordination,urgency first",clustering deployment of multi～well clusters should be applied to realize 3D and factory collaborative exploitation of multi～mineral resources.The major technologies of the arrangement of development cluster well groups were analysis technology of gas reservoir master control factor,predicting and zoning technology of gas enrichment area and optimizing technology of well pattern.There develop multiple gas～bearing series in the longitudinal direction of Shenmu Gasfield.Due to the large differences in plane distribution,these gas～bearing series must be subdivided into several blocks,and proper exploitation mode must be worked out for each block.The favorable areas of Shenmu Gasfield can be classified into 4 kinds,Upper Paleozoic sandbody multi～lateral overlapping zone(mainly in the north of the gasfield),Upper Paleozoic sandbody multi～layer overlapping zone(mainly in the center of the gasfield),Upper Paleozoic sandbody isolated overlapping zone(mainly in the south of the gasfield)and Upper～Lower Paleozoic gas reservoir overlapping zone(mainly in the north by west of the gasfield).Combining with drilling and gas production technologies,the 8 well deployment modes were optimized through economic evaluation,which shows 9～well multi～well cluster deployment is the optimum selection with the highest saving of drilling cost.According to the plane distribution of favorable areas in Shenmu Gasfield,and results of well～type and well～pattern optimization,corresponding technical measures have been worked out.Finally,a "multi～well cluster mixed well group development,multi～layer 3D development" mode has been established.Fast drilling technology of multi～well type in big well group、pipeline operation of fracturing model、centralized water supply mode and modular organization were main technologies and mode of drill and fracture.Well to well connection technology for gathering nature gas,integrated skid and digitalize management mode would minimize the impaction to the coal.Practices indicate that the technologies of collaborative development of mineral resources in the same blocks were a new way to solve the multi～mineral overlapping problem.更多还原