| 摘要 |
Techniques are disclosed for the safe production of shallow heavy oil sands which substantially reduce the probability of surface steam breakthrough. A pattern of injection wells and producing wells is drilled through the overburden into a relatively shallow heavy oil producing zone. Firstly the injection wells and the producing wells are cold produced for a combination of heavy oil and sand by use of a progressive cavity pump or the like. The steam push-pull is used on both the injectors and producers until heavy oil production becomes uneconomical. Finally, low pressure steam is continuously injected into the injection well and heavy oil continuously produced from the producing wells. |
