新型三分支环腔式自适应流入控制装置设计及数值模拟

水平井作为一种先进的钻井技术,已广泛应用在各种复杂的油气藏中,但水平井在开采底水油藏时面临着底水脊进的主要问题,早期的流入控制装置(ICD)和现在的自适应流入控制装置(AICD)通过均衡流入剖面控制底水脊进对水平井开采的影响,但都存在一定的局限性。本文在前人研究的流道型AICD的基础上,设计了一种三分支环腔式新型AICD控水装置并进行相应的优化设计,该装置结构简单,能够自动识别油和水,并能够根据油水性质差异对油和水产生不同的压降;利用ANSYS数模软件,对该装置进行仿真模拟和结构优化,优化结果为分支角为60°,入口个数为3时最优。最后进行敏感性分析,结果表明水流过该装置的压降远远大于油流过该装置时的压降;流体密度,黏度和含水率等参数对压降都有不同的影响,其中黏度的影响最大,密度的影响最小。

A new type design of AICD with three annular chambers and its numerical simulation

Horizontal wells, as an advanced drilling technology, have been widely used in various complex reservoirs. However, a major problem faced by horizontal wells in developing bottom water reservoirs is bottom water ridge entry. In order to control the effect of bottom water ridge entry on horizontal well production, the early inflow control device (ICD) and the present adaptive inflow control device (AICD) are used, but these devices all have some limitations. So based on the runner-type AICD studied by predecessors, a new type of three-branch ring-cavity AICD water control device is designed and optimized. The device has simple structure and can automatically identify oil and water, and produces different pressure drop according to the difference of oil and water properties. The simulation and structure optimization of the device are carried out, and the optimal result is that the branch angle is 60 degrees and the number of entrances is 3.The results show that the pressure drop of water flowing through the device is much greater than that of oil flowing through the device; the parameters of fluid density, viscosity and water content have different effects on the pressure drop, among which viscosity has the greatest influence and density has the least influence.