增强恢复能力

压裂增产提高了具有挑战性的北非完井作业的产量

本文介绍了一个北非油田的案例研究,该油田由两种不同渗透率的奥陶纪砂岩生产,通过在两口井中的一个或两个层段进行裂缝刺激获得了显着的效益。

阿尔及利亚撒哈拉
资料来源:Oussama MOKRANE/Getty Images/iStockphoto。

完整的论文介绍了一个北非油田的案例研究,该油田分布着一些油井,最初不需要压裂增产来实现经济生产,但现在可以从水力压裂中受益。其中许多井是通过多个射孔层段完井生产的,生产油管不是为压裂设计的,也无法进行修井。该油田由两种奥陶纪砂岩生产,一种渗透率较高(5 md),另一种渗透率低得多(0.5 md)。尽管完井和操作存在限制,但通过对两口井的一个或两个层段进行压裂增产取得了显着的效益。

油田和油藏背景

对于感兴趣的油田,该运营商于 2015 年在其特许权上钻探并完成了两口勘探井,目标是多个储层。这两口井都成功地从奥陶纪 Atchane 和 Jeffara 层段开采出碳氢化合物。

初步岩石物理分析结果表明,2 号井比 1 井具有更高的净高度和更好的储层质量,并且 Atchane 储层的质量比 Jeffara 储层更好,因为它包含约 80% 的渗透率厚度 (kh)。 Atchane 拥有更多的总储备。

制定了油田开发计划和油藏模型。

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Enhanced recovery

Fracture Stimulation Increases Production in Challenging North African Completions

This paper presents a case study of a North African oil field producing from two Ordovician sands with differing permeabilities where significant benefit was achieved by fracture stimulating one or both intervals in two wells.

Algerian Sahara
Source: Oussama MOKRANE/Getty Images/iStockphoto.

The complete paper presents a case study of a North African oil field scattered with wells that did not initially require fracture stimulation for economic production but now could benefit from hydraulic fracturing. Many of these wells are producing from multiple perforated intervals through completions with production tubing that were not designed for fracturing and cannot be worked over. The field is producing from two Ordovician sands, one with a higher permeability (5 md) and one with a much lower permeability (0.5 md). Significant benefit was achieved by fracture stimulating one or both intervals in two wells, despite completion and operational limitations.

Field and Reservoir Background

For the field of interest, the operator drilled and completed two exploration wells on its concession in 2015, targeting multiple reservoir layers. Both wells successfully flowed hydrocarbons from the Ordovician Atchane and Jeffara intervals.

Initial petrophysical analysis results indicated that Well 2 had more net height and better reservoir quality than Well 1 and that the Atchane reservoir is of better quality than the Jeffara reservoir because it contains approximately 80% of the permeability thickness (kh). Atchane holds more of the total reserves.

A field-development plan and reservoir model were prepared.

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