Evaluation Method of Test Productivity and Reasonable Allocation for Long Horizontal Wells in Deep-Water Faulted Sandstone Oilfield in West Africa

For deep-water faulted oilfields, long horizontal wells are arranged crossing the fault to improve the single-well controlled OOIP and productivity. At the stage of development plan implementation, in order to verify the well productivity, productivity tests were carried out for all drilled wells. In view of the loose reservoir, high productivity, multiple test chokes and short test time, we chose EGINA oilfield which is a deep-water faulted sandstone reservoir in West Africa, as the research target. Considering the sealing of faults and the superimposed relationship of sand bodies, four injection-production connection modes were established. A test productivity evaluation method with multi-level chokes was formed for long horizontal wells in deep-water faulted sandstone reservoirs. In addition, reasonable allocation for long horizontal wells was proposed for four connection modes. According to the practice in EGINA Oilfield, the evaluation method of test productivity and reasonable allocation for the long horizontal wells are reasonable and reliable, and can serve as a guide for similar long horizontal wells in deep-water faulted sandstone oilfields.