论文部分内容阅读
对注水井进行压裂常常成为达到所需波及效率的先决条件。对于注水能力非常低或水消散不利的注水井来说,更需要进行压裂。在常规增注技术(像酸化)证明无效的情况下,最近进行了水压裂的初步尝试。水压裂是获得长度有限裂缝的有效技术,保证了注水井达到较高波及效率。经过多学科工作队详细研究后选择了候选井,精心制定了作业程序:作业开始时采用低浓度支撑剂,作业结束时采用高浓度支撑剂,以便在近井地带获得较高导流能力。因为不使用聚合物,所以这一技术具有对地层损害小的另一个优点,而且还节省了化学剂和支撑剂的费用。该技术不但适用于注水井,而且还适用于污水处理井和注聚合物井。本文描述了水压裂方法和技术条件以及实例,详细讨论了作业设计和实施效果。
Fracturing a water injection well often becomes a prerequisite for achieving the desired sweep efficiency. Fracturing is even more necessary for injection wells that have very little water injection capacity or are not well-dispersed by water. In the recent case of hydraulic fracturing, which has proved ineffective with conventional injection techniques (like acidification). Water fracturing is an effective technique for obtaining finite length fractures, which ensures that water injection wells reach higher wave efficiency. Candidate wells were selected after detailed studies by a multidisciplinary task force to elaborate operational procedures: low proppants were used at the start of the job and high concentrations of proppants were used at the end of the job so that a higher conductivity was achieved in the near-wellbore. Because no polymer is used, this technique offers the additional benefit of less damage to the formation and also saves on the cost of chemicals and proppants. The technology is not only suitable for injection wells, but also for sewage treatment wells and polymer injection wells. This article describes the water fracturing method and technical conditions and examples, discussed in detail the job design and implementation results.