高速水充填防砂工艺优化及模拟研究

发布时间：2019-04-01 20:59

【摘要】：目前,在我国油田特别是疏松砂岩油田的开发过程中,油气井的出砂已经成为困扰开发的主要因素之一,防砂问题一直是油田开发的一个难题,严重阻碍的油气田的开发发展,防砂成为了油田开发的关键之一。高速水充填防砂能够有效的降低施工难度,达到较好的产能效果,同时不压开底水,适用于海上油田和离底水、气顶近的油层,但是目前针对于高速水充填的理解主要在于现场工艺方面,缺乏科学的理论指导知识。本文主要研究分析了高速水充填防砂工艺的基本原理及特点。在国内外现状调研基础上,研究分析了高速水充填防砂的适应条件及选井原则,形成了高速水充填防砂的具体选井条件;根据岩石力学知识,给出不同地质条件下岩石破坏模式判别图;分析高速水充填近井充填形态,提出高速水充填条件下微裂缝充填和塑性挤压充填两种充填模式;建立了高速水充填形态判别方法;针对塑性挤压充填,基于摩尔-库伦作为屈服条件建立塑性破坏时挤压充填半径模型,并对高速水充填中挤压充填半径进行影响规律分析,随着内摩擦角,体积模量的增大,挤压充填半径增大;随着平均地应力的增大,挤压充填半径减小;弹性模量对挤压充填半径影响很小。设计与完善现有微观驱替实验装置,进行了砾石充填防砂砾石尺寸及合理挡砂层厚度优化实验、机械筛管缝宽及挡砂精度优化室内实验以及井底条件下砾石层渗透率变化规律实验研究。实验表明,砾石与地层砂粒度中值比为4-5.5倍为宜;一般产量井,应保证有效砾石充填层半径不低于30cm,高产量井的有效充填半径不低于40cm;砾石层渗透率在压实作用下明显降低。为高速水充填防砂的砾石尺寸设计、挡砂厚度优化以及筛管精度选择提供了依据。针对高速水充填进行防砂施工参数优化设计并且开发高速水充填模拟设计软件,并对CB22H-10井进行高速水充填参数优化模拟设计,为现场提供参考。
[Abstract]:At present, sand production of oil and gas wells has become one of the main factors in the development of oil and gas fields in China, especially in loose sandstone oilfields. The problem of sand control has always been a difficult problem in the development of oil and gas fields, which seriously hinders the development of oil and gas fields. Sand control has become one of the key points in oilfield development. High-speed water filling and sand control can effectively reduce the difficulty of construction and achieve a good productivity effect. At the same time, the high-speed water filling and sand control is suitable for offshore oil fields and oil layers near the bottom water and gas roof, without pressing the bottom water. However, at present, the understanding of high-speed water filling mainly lies in the field technology, lack of scientific theoretical guidance knowledge. In this paper, the basic principle and characteristics of high-speed water filling sand control technology are studied and analyzed. Based on the investigation of the present situation at home and abroad, the adaptive conditions and well selection principles of high-speed water filling sand control are studied and analyzed, and the concrete well selection conditions of high-speed water filling sand control are formed. According to the knowledge of rock mechanics, the paper gives the discriminant diagram of rock failure mode under different geological conditions, analyzes the filling form of high-speed water filling near the well, and puts forward two filling modes of micro-fracture filling and plastic squeeze filling under the condition of high-speed water filling. A method for distinguishing the shape of high-speed water filling is established. For plastic extrusion filling, a model of extrusion filling radius during plastic failure is established based on Moore-Coulomb yield condition, and the influence law of extrusion filling radius in high-speed water filling is analyzed. With the increase of internal friction angle and volume modulus, the influence law of extrusion filling radius in high-speed water filling is analyzed. The squeeze filling radius increases; With the increase of the average in-situ stress, the squeeze filling radius decreases, and the elastic modulus has little effect on the extrusion filling radius. Design and perfect the existing micro displacement experiment equipment, and carry on the optimization experiment of gravel packing sand control gravel size and reasonable sand retaining layer thickness. Laboratory experiments on optimization of fracture width and sand-blocking accuracy of mechanical screen and experimental study on permeability variation of gravel layer under bottom hole conditions are carried out. The results show that the median grain size ratio of gravel to formation sand is 4. 5. 5. The radius of effective gravel packing layer should not be less than 30 cm in general production wells, and the effective filling radius of high-yield wells should not be less than 40 cm. The permeability of gravel layer decreases obviously under compaction. It provides the basis for the gravel size design, the optimization of sand retaining thickness and the selection of the accuracy of screen tube for high-speed water packing sand control. The optimization design of sand control construction parameters for high-speed water filling is carried out, and the simulation design software of high-speed water filling is developed, and the optimization simulation design of high-speed water filling parameters for CB22H-10 well is carried out, which provides a reference for the field.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358.1

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