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随着注水开发的不断深入,大港油田套损、套变问题日益严重。统计数据显示,大港油田套损井达到1189口,其中套损油井692口,影响产量1311.8t/d,套损水井497口,影响注水量11964m3/d,并且仍以每年70~80口的速度递增。套损、套变不仅影响油田稳产基础,还造成注采井网的不完善,给油田区块的整体开发带来不利影响。通过对套变类型、分布区域、套损程度进行统计分析,对套管变形井修复工艺技术进行研究,指出泥浆密度、排量直接影响到取换套、打通道的进度,甚至成为能否顺利施工的重要因素。针对裸眼取换套所需的井控设备、井口工具、泥浆处理设备提出了基本要求,给出了打通道需要配套的工具清单。编制出套损、套变治理工艺流程,研究了缩径变形、弯曲变形、错断变形三种类型修复工艺技术,尤其是对不同的缩径和错断,制定了施工工艺步骤,并在现场进行应用。共修复套损、套变井33口,其中油井27口、水井6口,累计增油5520t,累计增注38749m3。
With the deepening of waterflooding development, Dagang Oilfield sets the problem of casing damage and casing deterioration more and more serious. The statistics show that the number of casing damage wells in Dagang Oilfield has reached 1189, of which 692 wells have been damaged, affecting 1311.8t / d of production and 497 wells of water diversion wells, affecting the water injection volume of 11,964m3 / d and still taking 70 to 80 ports per year Increment. The casing damage and casing deformation not only affect the steady foundation of the oilfield, but also result in imperfect injection well pattern, adversely affecting the overall development of the oilfield block. Through the statistical analysis of casing deformation type, distribution area and casing damage degree, the paper studies the technology of casing deformation well repairing, and points out that the density and displacement of mud directly affect the progress of replacement casing and tunneling and even become smooth Construction of an important factor. The basic requirements for the well control equipment, wellhead tools and mud treatment equipment required for the naked eye replacement set are given, and a list of the tools that need to be matched for the tunneling is given. In this paper, a set of process of casing damage and casing deformation control is developed, and three types of repair technology are studied, such as reduced diameter deformation, bending deformation and wrongly broken deformation, especially for different diameter reduction and wrong connection, the construction process steps are formulated, Apply. A total of repair sets of casing damage, casing change wells 33, of which 27 wells, wells 6, a total of 5520t increase oil, the cumulative replenishment 38749m3.