关键词: 深层油气, 碳酸盐岩, 防塌完井, 评价优选, 堵塞机理, 评价实验

Abstract: The deep carbonate reservoirs in the Shunbei Oilfield face serious wellbore collapse and control issues during development. To explore the blockage mechanism of the collapse products in this reservoir and design a reasonable completion method, anti-collapse completion simulation experiments were conducted under different collapse product combination modes, studying the adaptability of perforated screen and slotted screen completion methods. The study shows that the blockage mechanism of collapse products includes stepwise progressive bridging of particles, large particle bridging-small particle free passage, and large particle bridging-small particle interstice accumulation. When the median particle size of the collapse products is 3.83, 3.35, 2.00, 1.65 and 1.54 mm respectively, slotted screen completion is generally feasible, while perforated screen is not suitable for the pure sand particle mode with a median particle size of 1.54 mm. Under the condition of relatively continuous particle size distribution of collapse products, it is recommended to use perforated screen and appropriately increase the hole density. Under the condition of relatively discontinuous particle size distribution of collapse products and a small proportion of sand particles, it is recommended to use perforated screen and appropriately increase the hole density; if the proportion of sand particles is large, it is recommended to use slotted screen and appropriately reduce the slot width. This study can provide a reference for the anti-collapse completion design of carbonate reservoirs.

Key words: deep oil and gas, carbonate rocks, anti-collapse completion, evaluation preference, blockage mechanism, evaluation experiment