煤层气井循环补水排采工艺

科学技术的不断发展,为煤层气井排采作业效率的提高带来了重要的保障作用,给后期煤层开采计划的顺利实施打下了坚实的基础。在实际的操作过程中,为了满足进入井筒煤粉排出的具体要求,需要开展必要的循环补水试验,促使煤层气井中堆积的煤粉能够有效地排出地面,降低相关故障的发生率。基于此,本文将对煤层气井循环补水排采工艺进行必要地探讨,以便为相关的研究工作开展提供有效的参考信息。

压实度对苏打型盐渍土冻融特性影响研究

研究冻融作用下压实度对盐渍土工程性质的影响,解释盐胀病害发生机理、发展规律和影响因素,为研究区域工程建设提供理论指导。选取大庆地区典型的苏打型盐渍土,在分析其理化性质的基础上,设计压实度为85%、90%、95%的3组试样,借助土工冻胀试验箱对大庆地区苏打型盐渍土进行冻融循环试验。试验结果表明:封闭系统中压实度为85%时以冻(盐)胀为主,90%时融沉显著,而95%的压实度能较好地抑制冻胀和融沉;其中第1个冻融循环对苏打型盐渍土的变形影响最大;由于研究区域地下水位较高,为模拟实际工况,进行补水试验,结果显示,补水条件下苏打型盐渍土对温度变化更加敏感,土的融沉比冻胀问题更突出,在实际工程中应做好地下水的处理工作。

Tracer Testing Strategies for Effective Design and Implementation of in Situ Groundwater Remediation

The effectiveness of an injection-based remediation strategy is primarily governed by accurate understanding of reagent delivery and ensuring uniform distribution within the reactive zone. In IRZ （in situ reactive zone） design, the required reagent strength, injection volumes, injection rates, injection frequency, injection and monitoring well spacing, and the cost and time to achieve remediation goals are governed by the hydrogeology of the site. A properly designed tracer test is capable of providing critical above mentioned site-specific information, to assist with full scale design of an IRZ. This paper describes that implementing tracer testing to support remedial design can result in enhanced design efficiency, added assurance in full-scale implementation and ultimately resulted in substantial cost savings. Therefore, it is recommended that the broader practitioner community adopt this technique as a best practice for effective and optimum in situ remediation system design.