二氧化碳压裂井下工具设计与应用研究

【作者】 张维锋；

【导师】 张树有；

【作者基本信息】 浙江大学 ， 机械设计及理论， 2003， 硕士

【摘要】 由于CO₂压裂具有低滤失、返排能力强、与地层流体配伍性良好，减小压裂液对地层的伤害等优点，是油田后期低渗透油层、水敏地层、稠油油层有效的改造措施。CO₂压裂井下工具是实施压裂施工的重要井下装置，设计一套不动管柱坐压两层、能够同时进行返排的井下工具计算工作复杂，绘图工作繁琐。CAD技术和机械产品方案设计智能化及CAD一体化技术在企业的合理应用对于提高产品设计效率、改进产品质量、增强产品的市场竞争力都有重要意义。本文立足油田CO₂压裂工艺技术对井下工具的需求，对CO₂压裂井下工具的设计计算、绘图工作作了深入的研究，在此基础上，我们成功设计了CO₂压裂井下工具封隔器、喷砂器、喷嘴堵塞器总成，在现场中取得了良好的应用效果。 本文将所研究的主要内容组织在六章中。第一章介绍了本论文（项目）的研究背景及意义，给出了论文的总体框架；第二章以井下工具的圆筒类典型结构为计算对象，建立其在工程外力下的应力模型，以应力状态分析为基础，确定了工程所需的各项计算功能并予以实现；第三章研究了基于井下工具回转体特征的建模过程，研究应用了基于语义与结构特征相关联的设计方法，根据井下工具的结构特征，重点研究并寻找建立了回转体特征基元。第四章介绍了CO₂压裂井下工具的功能要求和结构设计，对其中的封隔器、喷砂器、喷嘴堵塞器进行详细的设计计算及结构绘制。第五章研究设计了CO₂压裂井下工具的现场试验工工艺，介绍了典型井的CO₂压裂过程和CO₂压裂井下工具的使用情况。对井下工具进行各项功能验证；第六章对所进行的工作作以总结并对今后工作进行了展望。更多还原

【Abstract】 Computer aided design(CAD) intelligent of mechanical products design and integrated computer aided design(ICAD) technology are very important for enterprise to improve efficiency of products design, product quantity and product market competitive ability, it is certain to bring considerable profit. based on the downhole tools demand of CO2 fracturing technology at oilfield, in design of CO2 fracturing downhole tools and drawing, this paper does research in depth, to provided the base for setting and perfecting downhole tools intelligent design..To set the stress model of CO21 fracturing downhole tools abstract parts design and examination. by the numerical calculating method, to overcome the error in handwork calculation, because three- dimensional model was only simplified two- dimensional model, and it can’t calculate the error between three -dimensional model and two- dimensional model, to realize the scientific design of downhole tools with high accuracy..Based on the geometry character and parameterization design limited in the intelligent CAD design, and design method of figure base, model definition of figure base parameterization was presented..By the engineering example, to introduce system of CO2 fracturing downhole tools intelligent design, and the field application results of design products, next research way has been planned.更多还原