煤层气井井间无干扰并网集输装置设计研究

Research on Gathering and Transportation Technology of Coal-bed Gas Well Inter-well Interference-free Grid Connection

针对在煤层气开发中各区块都没有考虑井况参数不同、区块地层能量不同就直接并输导致气井产量减少问题,提出了采用无干扰并网集输技术,利用高压井能量输送低压井,并建立了一套无干扰并网集输装置的设计方法。介绍了无干扰并网集输装置的工作原理及结构,确定了以无干扰并网集输装置的喷射系数作为设计指标和计算依据,给出了计算无干扰并网集输装置结构尺寸的公式,通过该方法设计了无干扰并网集输装置。采用Fluent数值模拟方法对无干扰并网集输装置进行流场仿真,通过仿真模拟,揭示了装置内部的流动规律,验证了利用无干扰并网集输装置将低压井从0.14 MPa增压至0.19 MPa,实现利用高压井带动低压井增压输送目的。仿真结果表明,当喷嘴直径在42~46 mm时,为喷嘴直径最佳参数范围;当喉管直径在54~56 mm时,为喉管直径最佳参数范围。

In the development of coalbed methane,each block did not take into account the different well condition parameters and the different formation energy of the block.The direct parallel transmission caused the reduction of gas well production.The use of non-interference grid-connected gathering and transportation technology was proposed to use high-pressure well energy to transport low-pressure wells.And established a set of design methods for non-interference grid-connected gathering and transmission equipment.The working principle and structure of the non-interference grid-connected gathering and transportation device were introduced.The injection coefficient of the non-interference grid-connected gathering and transportation device was determined as the design index and calculation basis,and the calculation of the structure size of the non-interference grid-connected gathering and transportation device was given.Through the method,a non-interference grid-connected gathering and transmission device was designed.The Fluent numerical simulation method was used to simulate the flow field of the non-interference grid-connected gathering and transportation device.Through the simulation,the flow law inside the device was revealed,and it was verified that the low-pressure well was pressurized from 0.14 MPa to 0.19 MPa,by the non-interference grid-connected gathering and transportation device,which achieved the purpose of using high-pressure wells to drive low-pressure wells for pressurization and transportation.The simulation results show that when the nozzle diameter is 42~46 mm,it is the best parameter range of the nozzle diameter;when the throat diameter is 54~56 mm,it is the best parameter range of the throat diameter.