Abstract:

An optimization model for completion strings with inner-located nozzle of horizontal wells coupled with reservoirs was established according to the mass conservation law and momentum theorem. The study demonstrated that compared with the manner using a simple blank tubing or adjusting the nozzle size, the manner using an external casing packer only or additionally in conjunction with a blank tubing (or nozzle size adjustment) could adjust the production fluid profile in a wider range. Since the high permeability zone is both the major water flooded zone and the major fluid producing zone, an undue limit of the liquid producing amount of high permeability zones may not be able to achieve a preferable result of development due to the co-existence of the limited liquid producing amount and the loss of the crude output. In non-homogeneous bottom-water reservoirs, the cumulative oil production decreases with the increase of the variation coefficient, this trend is more obvious as the variation coefficient is greater. The best effect (the maximum increase of oil production) can be obtained when the variation coefficient is about 0.6, and effects of these measures may be not obvious when the variation coefficient is too small or too great.

Key words: bottom-water reservoir, completion strings with inner-located nozzle, coupling model, variable mass flow, stabilizing oil production by water control

摘要：

根据质量守恒定律和动量定理，建立了与油藏耦合的水平井调流控水筛管优选模型。研究发现，相对于单纯的实施盲管段或调整嘴子大小的方式，实施管外封隔或在实施管外封隔的同时配合使用实施盲管段（或调整嘴子大小）的方式对产液剖面的调整幅度较大。由于高渗透带是主要的水淹带，同时又是主要的产液带，因此，过分限制高渗透带的产液量未必能取得较好的开发效果，因为在限制高渗透带产液量的同时也损失了产油量。在非均质油藏中，随着变异系数的增加，累积产油量减少；变异系数较大时，累积产油量减少的趋势更加明显；实施最优的调流措施时，累积产油量增加；当变异系数约为0.6时，调流的效果最好（增油量最大），变异系数太小或太大调流效果均不明显。

关键词: 底水油藏, 调流控水筛管, 耦合模型, 变质量流, 稳油控水