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Field Testing the Polysaccharide Schizophyllan -Single Well Test Design and Current Results

机译:田间测试多糖斯齐齐奇兰 - 灵乐井测试设计和当前结果

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A bio-polymer pilot flood is ongoing in Bockstedt, a mature oilfield in northern Germany. Bockstedt is a highly saline, moderately viscous, moderate temperature and darcy sandstone reservoir and is on waterflood since 1959. Previous results of Schizophyllan properties in lab and field have been published by Leonhardt et. al. (SPE 169032) and Ogezi et. al. (SPE 169158). The polymer has shown very good injectivity and even though positive response was observed in a producer, no breakthrough of polymer has been observed so far in the producer. To understand this fact, multiple single well tests (SWT) have been conducted in the field by injecting, incubating and back-producing, to check the biopolymer performance especially in terms of mechanical/biological/chemical stability. Single well tests were designed considering several factors. Based on ability to produce/inject from/into the well, representative condition like temperature, shear, microbes and ability to acquire production/ injection log data, an injector well in the pilot block was selected. Additionally injection rates, biocide concentration/type were varied to check the mechanical/microbial stability. The injected and produced volume were designed in a way to minimize dilution and mechanical stressing of biopolymer. Progressive cavity pump was used to avoid shear in the wellbore during back-production. A very extensive lab surveillance plan was set up to understand dilution of samples from wellbore/ reservoir, mechanical and microbial degradation. Viscosity, microbial growth, chemical analyses and structural analyses of biopolymer conformation were performed on baseline injection samples and back produced samples at different times. Chemical tracers assisted in quantifying dilution of the injected polymer slug while back-producing. Special sampling procedures (e.g. anaerobic, sterile, high pressure sampling) were developed to ensure representative reservoir sample and its preservation in order to avoid incorrect conclusion. This paper presents the lab and field initial test design, important learnings during testing and the main outcome of the multiple single well tests.
机译:在德国北部的成熟油田博克斯特德的生物聚合物飞行员洪水正在进行。 Bockstedt是一种高度盐水,适度粘稠,温度,温度和达西砂岩水库,自1959年以来正在水翅片。莱昂哈德特·埃伦哈德特·埃伦特特·埃伦特特·埃伦特特·埃伦特特·埃伦特(Leonhardt Et)出版了以来的水砂岩水库。 al。 (SPE 169032)和Ogezi等。 al。 (SPE 169158)。聚合物表现出非常好的注射性,并且即使在生产者中观察到阳性反应,也没有在生产者中观察到聚合物的突破。为了理解这一事实,通过注射,孵育和背部产生多种单一井测试(SWT),以检查生物聚合物性能,特别是在机械/生物/化学稳定方面。考虑若干因素设计了单一井测试。基于生产/注射的能力/进入井中,代表性条件,如温度,剪切,微生物和获取生产/注射日志数据的能力,选择了试验块中的喷射器。另外注射速率,杀生物剂浓度/类型变化以检查机械/微生物稳定性。注入和产生的体积以最小化生物聚合物的稀释和机械应力最小化的方式设计。渐进式腔泵用于避免在后部生产期间避免井筒剪切。建立了一个非常广泛的实验室监控计划,以了解来自井筒/储层,机械和微生物降解的样品的稀释。对基线注射样品进行生物聚合物构象的粘度,微生物生长,化学分析和结构分析,并在不同时间进行后施加的样品进行。化学示踪剂辅助在背部产生时量化注入的聚合物夹板的稀释。开发出特殊的采样程序(例如,厌氧,无菌,高压取样),以确保代表性储层样本及其保存,以避免不正确的结论。本文介绍了实验室和现场初始测试设计,在测试期间的重要学习以及多个单一井测试的主要结果。

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