自主存储式水力压裂过程井下测试系统设计  

Design of an Autonomous Electronic Pressure-Gauge For Hydraulic Fracturing Process

作　　者：汪跃龙[1,2] 霍爱清[2] 程为彬[2] 吕锦省[2] 

机构地区：[1]西北工业大学航海工程学院,陕西西安710072 [2]西安石油大学陕西省钻机控制技术重点实验室,陕西西安710065

出　　处：《测控技术》2010年第7期20-23,共4页Measurement & Control Technology

基　　金："863计划"资助项目(2008AA042202);石油天然气集团公司创新基金项目(07E1014)

摘　　要：水力压裂过程的井下测试是压裂效果评价、改进压裂工艺的重要依据。在进行井下测试时,由于实际作业时间常与计划时间有较大差异,经常造成预先按作业计划设定存储的且存储容量有限的井下测试仪对关键时段没有记录。论文中分析了压裂作业井下压力曲线在不同作业时段的特征,提出了以压力、压力梯度作为特征参数来判定压裂作业所处时段的简单逻辑判别方法,并设计了自主存储策略和基于单片机的仪器电路。测试实验表明该方法是有效的,仪器可自主对关键时段的参数进行密集采样和存储。Downhole test data of hydraulic fracturing process is important foundation of fracturing evaluation and technique improving.However,data acquiring and recording of fracturing process by downhole electronic pressure gauge,which has limited memory and a pre-configuring work program according to a fracturing project may lose many valuable records due to the difference between this program and real fracturing operation.Pressure curve and its features of normal fracturing process has been analysed.A method to distinguish distinct stages of fracturing process has been proposed by a simple logic estimating technique based on pressure and its gradient.Then,an autonomously recording strategy has been given,which can distinguish crucial stage and record data in a shorter period than normal.Measurement and record schematic has been given.A test under laboratory condition has been done,which indicated this design is effective.

关 键 词：水力压裂 压力特征 自主存储 

分 类 号：TE938.5[石油与天然气工程—石油机械设备]