洼25新12井区防砂技术应用研究

发布时间：2018-03-15 00:23

本文选题：低效低产　切入点：储层评价　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：油层出砂是砂岩油层开采过程中的常见问题之一。对于疏松砂岩油藏,出砂是提高采油速度的主要障碍。我国疏松砂岩油藏分布范围广、储量大,产量占有重要的地位,这类油藏开采中的主要矛盾之一是油井出砂。既提高了原油生产成本,又增加了油田开采难度。因此,油井防砂工艺技术的研究和发展对疏松砂岩油藏的顺利开发至关重要。针对洼25新12井区储层特征进行研究评价,以找出停产、低产原因,达到提高油井上产、增产的目的,实现低成本高效益。同时建立一套适用于辽河特点的低效油气井开发技术管理模式。本文对该储层进行了四方面的研究,确定洼25-新12井区油层为稠油油斑细砂岩,岩石颗粒间以点接触为主,孔隙接触式胶结,属中孔高渗。胶结物为泥质胶结,泥质含量较高。在油井生产时,在地层流体的拖拽作用下,地层极易遭到破坏,导致油井出砂。针对地质特征进行出砂原因分析,确定该井区油井出砂的四个因素:储层特性决定油层出砂;粘土矿物水化膨胀;原油粘度大,携砂力强;地层砂蒸汽溶蚀变细。对以往防砂技术回顾及效果分析,在相邻区块的成功防砂经验基础上,确定了洼25新12井区的主体防砂工艺为压裂防砂。文中还对压裂防砂技术的实施做了明确的要求,并对树脂覆膜砂进行了改进试验。经现场应用证明,采用压裂防砂能够解决小洼油田(含洼25新12井区),海外河油田的低产低效井出砂问题。
[Abstract]:Sand production in reservoir is one of the common problems in sandstone reservoir production. Sand production is the main obstacle to improve oil recovery rate in unconsolidated sandstone reservoirs. The loose sandstone reservoirs in China have a wide distribution range, large reserves, and production plays an important role. One of the main contradictions in the exploitation of this kind of reservoir is the sand production of oil wells, which not only increases the production cost of crude oil, but also increases the difficulty of oil production. The research and development of sand control technology is very important for the development of loose sandstone reservoir. The reservoir characteristics of WA 25 Xin12 well area are studied and evaluated in order to find out the cause of shutdown and low production, so as to increase oil well production and increase production. In order to realize low cost and high benefit and set up a set of low efficiency oil and gas well development technology management model suitable for Liaohe characteristics, this paper studies the reservoir in four aspects, and determines that the reservoir in WA25- Xin12 well area is heavy oil patch fine sandstone. The contact between rock particles is mainly point contact, pore contact cementation, which belongs to medium porosity and high permeability. The cementation is muddy, and the content of clay is high. During the production of oil wells, the formation is liable to be destroyed under the tug action of formation fluid. According to geological characteristics, four factors of sand production in the well are determined: reservoir characteristics determine sand production in oil reservoir, hydration expansion of clay minerals, high viscosity of crude oil and strong sand carrying capacity; Steam dissolution and thinning of formation sand. Review of previous sand control technology and analysis of its effect, on the basis of successful sand control experience in adjacent blocks, It is determined that the main sand control technology in WA 25 Xin12 well area is fracturing sand control. In this paper, the specific requirements for the implementation of fracturing sand control technology are made, and the improvement test of resin coated sand is carried out, which is proved by field application. Sand control by fracturing can solve the problem of sand production in low production and low efficiency wells in Xiaowa Oilfield (well No. 12 with WA 25) and in Offshore River Oilfield.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358.1

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