要点
- 古巴时间星期一早上，穿孔在 3272 和 3450mMD 之间成功运行，证据是地面立即出现了显著的压力响应。
- 与最近从更深的 Marti 油藏获得的结果一致，在流动测试期间无法回收钻柱流体。
- 未获得未受污染的油样；在 DST 管柱的反向循环中回收了油样，并已送去实验室分析。
- 鉴于 Marti 和 Alameda 油藏在评估中的表现相似，之前都显示出强烈的油迹，研究将集中于这两口井钻探之间发生了什么变化（假设偏移量最小）。
- 在分析这些结果的同时，今年的首要任务仍然是从 Amistad 构造出口第一批 1B 单元石油。Melbana

Energy 执行主席 Andrew Purcell 评论道：“Marti 和 Alameda 油藏之前都显示存在可自由移动的碳氢化合物，这些碳氢化合物无需任何帮助即可流到地面。当评估井轨迹与原始勘探井的偏移最小时，这两个油藏现在都无法做到这一点，这意味着研究需要关注已获得的新数据和已更改的有限钻井参数。

我们将结合本地和国际专家的建议，了解如何将此类油藏响应补救到新获得的数据中，以帮助我们集中研究。

我们的近期计划是今年采取必要措施，将 Amistad 油藏的产量输出，随后在 Amistad 油藏开发更多评估井。”

Melbana Energy Limited 是古巴陆上 9 号区块 PSC 的 30% 股东和运营商，很高兴为 Alameda-3 评估井提供此运营更新。Alameda

油藏的流量测试于古巴时间周一上午开始，成功在 3272 至 3450mMD 之间射孔套管（见图 1）。

测试的目的是确定 Alameda 油藏（位于最近测试的 Marti 油藏上方，由有效密封岩隔开（见图 2））的石油质量和流量，以更广泛地了解该油藏的生产特性。

油藏作为下部的一个单独区域进行测试，被解释为包含最高孔隙度和生产间隔，如常规测井分析和 FMI 所示（见图 3）。

在发射射孔枪后，立即出现地面压力的阳性迹象，证实射孔成功。压力随后迅速升至 3034 PSI。

打开不同尺寸的节流阀的测试仪表仅回收了 14% 的负载流体。然后关闭油井以建立压力，但重新开放后地面的回报极少。

没有获得未受污染的油样；在 DST 管柱的反向循环中回收了油样，并已送去实验室分析。

该井无法流动与之前的观察和预期不符，因为该间隔内的电缆和 FMI 表明，除了高度裂缝的产层外，还存在大量优质的常规（即不依赖裂缝的）产层（见图 3）。

值得注意的是，这一结果与近期较深的 Marti 油藏未能将碳氢化合物流到地面的类似情况相符，尽管 Alameda-1 勘探井的两个油藏都表现出了将碳氢化合物流到地面的能力。

目前，公司不确定这是由于形成乳化液（即石油钻井泥浆反应）导致的地层损坏，还是由于岩石钻井泥浆反应。

目前的计划是暂停油井，拉出压力表和 DST 管柱，收集所有可用数据，并根据所有新数据、以前的钻井经验以及国际和当地专家知识制定最佳补救计划。

结果不会影响基于 Amistad Unit 1B 的初始油田开发计划，该计划有望在今年从第 9 区块首次出口石油。Melbana 将定期更新开发计划，直至今年晚些时候首次出口石油。

Highlights
- Perforations ran successfully between 3272 and 3450mMD on Monday morning Cuba time, evidenced by immediate and significant pressure response at surface.
- Consistent with recent results from the deeper Marti reservoir, drill string fluids were unable to be recovered during flow testing.
- No uncontaminated oil samples were obtained; oil samples were recovered on reverse circulation of the DST string and have been sent for lab analysis.
- Given both the Marti and Alameda reservoirs have behaved similarly under appraisal when both previously showed strong oil shows, studies will focus on what has changed between the drilling of these two wells (given minimal offset).
- In parallel with analysis of these results, the priority remains to export the first shipment of Unit 1B oil from the Amistad structure this year.

Melbana Energy’s Executive Chairman, Andrew Purcell, commented: “Both the Marti and Alameda reservoirs have previously shown the presence of freely moveable hydrocarbons that flowed to surface unassisted. That both reservoirs should now fail to do so when the appraisal well trajectory is minimally offset to the original exploration well means studies need to focus on the new data that has been acquired and the limited drilling parameters that have changed.

We will incorporate local and international expert advice as to how to remedy such reservoir responses into the newly acquired data to help focus our studies.

Our immediate plan is to work on the steps required to export production from the Amistad reservoir this year and to develop more appraisal wells in the Amistad reservoir thereafter.”

Melbana Energy Limited, a 30% interest holder in and Operator of Block 9 PSC onshore Cuba, is pleased to provide this operational update for the Alameda-3 appraisal well.

Flow testing of the Alameda reservoir commenced on Monday morning, Cuba time, with the successful perforation of the casing between 3272 and 3450mMD (see Figure 1).

The objective of the testing was to determine oil quality and flow rates for the Alameda reservoir (located above the recently tested Marti reservoir, which is separated by effective seal rocks (see Figure 2) to gain a broader understanding of that reservoir’s production characteristics.

The reservoir was tested as a single zone in the lower section interpreted to contain the highest porosity and productivity interval, as indicated by conventional log analysis and FMI (see Figure 3).

Immediately upon firing the perforation guns, there was positive indication of pressure at surface, which confirmed the perforations had been successful. Pressure then quickly built to 3034 PSI.

Test gauges were opened on variable choke sizes only 14% of load fluid was recovered. The well was then shut in to build pressure, however minimal returns were achieved at surface after reopening.

No uncontaminated oil samples were obtained; oil samples were recovered on reverse circulation of the DST string and have been sent for lab analysis.

The inability of the well to flow does not fit with previous observations and expectations, given wireline and FMI over this interval indicate substantial good quality conventional (i.e. not fracture dependent) pay in addition to the highly fractured pay (see Figure 3).

It is important to note that this result is consistent with the similar recent failure of the deeper Marti reservoir to flow hydrocarbons to surface, despite both reservoirs demonstrating an ability to do so in the Alameda-1 exploration well.

At this stage the Company is unsure whether this is due to formation damage related to the formation of an emulsion, i.e. an oil-drill mud reaction, or a rock-drill mud reaction.

The forward plan is now to suspend the well, after pulling the pressure gauges and DST string, gather all available data, and build an optimum remediation plan based upon all new data, previous drilling experience, and international and local expert knowledge.

The results do not impact initial field development plan based on Amistad Unit 1B which is on track to deliver the first export of oil from Block 9 this year. Melbana will provide regular updates on the development program through to first oil exports later this year.