摘要
井下节流工艺是大庆火山岩气藏高压低产气井高效节能开采的一种重要技术手段,节流降压工艺可以实现地面低压集输、节约建井成本。卡瓦式任意位置井下节流器是气井井下节流工艺的配套工具,模拟试验过程中发现,卡瓦锚定坐封后,卡瓦边部磨损较大,且与锚定后油管内壁牙齿咬痕明显,工具使用寿命受限。为此,开展了节流器卡瓦与油管、卡瓦与锥体接触力学状态分析。运用建模软件建立实体模型,利用数值模拟分析方法进行受力分析,从力学性能角度对工具结构进行分析,提高井下节流工艺可靠性。模拟分析结果表明:在不改变卡瓦整体尺寸的条件下,通过改进卡瓦与锥体接触面的状态,触段面端部由直线改为2°圆弧,卡瓦与油管最大接触应力由924 MPa降低至577 MPa (降低幅度达37.5%),现场应用表明,节流器工作寿命延长1年以上,每口井年节约钢丝作业2次,节约作业施工费用32万元,显著提升气井开发效益,井下节流器结构优化为高压低产气井高效节能开发提供技术支撑。
Downhole throttling technology is an important technology for high pressure and low production gas wells in Daqing volcanic gas reservoir. Throttling and depressurization can realize surface low pressure gathering and transportation and save the cost of well construction. Downhole choke of the slip type is a matching tool for downhole throttling technology of gas well. During the simulation test, it is found that after the slip is anchored and sealed, the side of the slip is greatly worn, and the teeth on the inner wall of the oil tube are obviously bitten after anchored.Therefore, the contact mechanical state analysis between the slip and the oil tube, the slip and the cone of the restrictor is carried out. Modeling software is used to establish the entity model,and numerical simulation analysis method is used for force analysis. The simulation results show that, under the condition of not changing the overall size of slips, the maximum contact stress between slips and oil pipes is reduced from 924 MPa to 577 MPa by improving the state of contact surface between slips and cones, and the end of contact surface is changed from the straight line to the 2° arc. The improvement of tool performance improves the reliability of downhole throttling technology and provides technical support for the economic and efficient development of high pressure and low production gas wells.
作者
王鹏
WANG Peng(Production Engineering&Research Institute in Daqing Oilfield;Key Laboratory of Oil and Gas Reservoir Stimulation,Heilongjiang Province)
出处
《石油石化节能》
2020年第5期40-43,I0007,共4页
Energy Conservation in Petroleum & PetroChemical Industry
关键词
高压低产气井
井下节流器
卡瓦
high pressure and low production gas well
downhole choke
slip
作者简介
王鹏,高级工程师,2014年博士毕业于东北石油大学(石油与天然气工程专业),从事油气井压裂完井工艺及井下工具研究工作,13946964945,E-mail:wangpeng2017@petrochina.com.cn,黑龙江省大庆市让胡路区西宾路9号采油工程研究院,163453。
