The Hassi Messaoud field (Figure 1), discovered in 1956, is the largest oil field in Algeria, covering about 2000 Km2 and currently including over 1000 Wells. The field is divided aerially into 25 zones that are separated from each other by low permeability barriers, usually faults. The Cambrian Reservoir is subdivided into four lithological zones designated rom base to top as R3, R2, Ra and Ri. The Ra sub reservoirshows the best petrophysical properties with a maximum thickness of 150 m in the western part of the field. The Ra is farther subdivided into five sub zones: D1, ID, D2, D3, and D4 based on reservoir properties and depositional conditions. Well F was the 6th re-entry well in the Sonatrach Coiled Tubing – Underbalanced Drilling campaign. A total of 363 m from KOP (303 m from landing point) were successfully drilled in a continuous underbalanced condition inside D1 and ID formations. As a result, the well productivity while drilling and while production test, the reservoir characterization and rate of penetration was significantly improved, compared with offset wells, due to the positive impacts of UBD operations.
展开▼
机译：在1956年发现的Hassi Messaoud领域（图1）是阿尔及利亚最大的油田，覆盖约2000公里，目前包括1000多井。该领域稳定地分为25区，通过低渗透屏障彼此分开，通常是故障。寒武纪水库被细分为四个指定的ROM基底，顶部作为R3，R2，RA和RI。 RA子储存器在该领域的西部最大厚度为150米的最佳岩石物理性能。 RA对五个子区域进行较远，基于储层性能和沉积条件，进入五个子区域：D1，ID，D2，D3和D4。 FOR F是SONATRACH卷管 - 欠平衡钻探运动中的第6次重新进入。在D1和ID地层内的连续不平衡状态下成功钻出了距kop（距离着陆点303米）的363米。因此，由于UBD操作的积极影响，钻井钻井和生产试验，储存试验，储层表征和渗透率的速度显着提高了显着改善。
展开▼
