顶部注气重力驱控气采液井筒可视化模拟实验

Visual simulation experiment on the borehole with liquid production by controlling the gas in the reservoirs stimulated by top gas injection based gravity drive

耿彤 秦义 杨小平 顾龚杰 翟锡芝 高艳芳 杨康

GENG Tong QIN Yi YANG Xiaoping GU Gongjie ZHAI Xizhi GAO Yanfang YANG Kang

中国石油华北油田公司工程技术研究院

Engineering Technology Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062550, Hebei, China

实施顶部注气的重力驱油藏，随着不断周期性注气，油气界面下移，在生产前中期，不可避免地造成井筒气窜。针对此问题，提出通过套管放气达到井筒“气液分疏、控气采液”的举升工艺思路。为了掌握举升工艺中产出气在井筒中的运动规律及流动状态及气体对抽油泵的影响，采用套管放气来判断在井筒中能否形成稳定气液界面，并开展了井筒可视化模拟实验。结果表明：在套管定量放气且油管鞋位置始终处于产层以下条件下，能够实现一段时间内稳定生产。研究结果可用于指导实施顶部注气重力驱油藏原油的开采。

In the oil reservoirs which are stimulated by the top gas injection based gravity drive, the oil-gas contact moves downward with the continuous cyclic gas injection, which inevitably results in borehole gas channeling in the early and middle stages of the production. To solve this problem, the uplift idea of " gas-liquid separation, and liquid production by controlling gas” by means of casing gas releasing was proposed in this paper. In order to figure out the movement laws and flow regimes of produced gas in the borehole and the effects of the gas on the pump in the process of uplift, the casing gas releasing was adopted to judge whether stable gas-liquid contact could be formed in the borehole, and visual borehole simulation experiment was carried out. It is indicated that stable production can be kept for a while if the casing gas releasing is at a constant rate and the tubing shoe is always located below the producing pay. The research results can be used as the guidance for the production of oil reservoirs by the top gas injection based gravity drive.

10.13639/j.odpt.2019.03.014