Otto Energy有限公司日前宣布,运营商Byron Energy已完成了SM-71 #1井的钻井工作。该井位于Marsh岛南部的71区块,最终钻进垂深为6843英尺(2086米)或者6477英尺(1974米)。
在钻探过程中,钻遇了大量的含烃砂层并利用了随钻测量工具进行了初步的评价。以下是观测到的含烃砂层记录情况:
I3砂-含烃总砂层厚度约为20英尺(6米)
J砂-含烃总砂层厚度约为30英尺(9米)
D5砂-含烃总砂层厚度约为100英尺(3米)
D5砂层间隔的碎屑以及含烃层的湿气比例增加,表明钻遇层含有原油。
初步解释结果表明这些含烃砂岩中有很大比例是纯烃层,但只有通过孔隙度测井后才可确定纯烃层的厚度,其厚度可能小于现在测量的总砂层厚度。
这口探井的主要目标层是油藏条件较好的D5砂层,该砂层的实际钻遇深度在预期范围之内,采用RTM技术对该砂层进行了油藏描述。探井的次要目标层J砂层,该砂层的实际钻遇深度也在预期范围之内,该探井的位置在J砂层产量最高井斜上方220英尺(67米)处。SM 71探边井的I3砂岩隔层还未开始生产。
当前操作是挖一个小孔来处理多余的井壁泥饼,并在孔隙度测井前再核实下小孔的情况。当钻遇到D5砂层下方时,压力的变化需要增加泥浆的密度来控制钻进。较大的泥浆密度可抑制气体进入,但也需要考虑井筒的实际条件。
这三个分散隔层的初步结果表明该探井有一定产量可进行商业开发。考虑以后的开发情况,可采取间歇生产和停井等措施。合资公司紧紧围绕发展规划并已与经营商探讨如何高效开发这口探井。
来自/WorldOil 4月21日消息 编译/吴海君
WEST PERTH — Otto Energy Ltd has announced that it has been advised by Operator Byron Energy, that the SM-71 #1 well, located at the South Marsh Island Block 71, has completed drilling to the final target measured depth of 6,843 ft (2,086 m) or 6,477 ft (1,974 m) TVD.
During drilling a number of discrete hydrocarbon bearing sands have been intersected and preliminary evaluation completed using Logging While Drilling (LWD) tools. The following hydrocarbon indications have been observed to date:
I3 Sand – a hydrocarbon saturated gross sand thickness of approximately 20 ft (6 m)
J Sand – a hydrocarbon saturated gross sand thickness of approximately 30 ft (9 m)
D5 sand – a hydrocarbon saturated gross sand thickness of approximately 100 ft (3 m)
Indications of oil were seen on cuttings from the D5 sand interval and all hydrocarbon bearing zones demonstrated elevated wet gas readings.
Based on preliminary interpretation of these results it appears that a significant proportion of these hydrocarbon bearing sands will result in net hydrocarbon pay, however net pay counts cannot be determined until a porosity log is run and may be determined to be less than the gross sand amounts reported here.
The D5 Sand, which was the primary target of this well, exhibits excellent quality, is within the range of predrill expectations, and confirms the RTM technology used to delineate the prospect. The J Sand, which was a secondary target, was found within predrill expectations and was intersected 220 ft (67 m) up-dip of the highest productive well in the J Sand interval. The I3 sand interval does not appear to have been produced in offset wells on SM 71.
Current operation is to run in to the hole with a bit to address excess wall-cake build up and verify the hole’s condition prior to running porosity logs. Whilst drilling to total depth below the D5 Sand, a pressure transition was intersected which required an increase in mud weight to control the well. The higher mud weight suppressed gas ingress, but will require additional conditioning of the wellbore.
The preliminary results from these three discrete hydrocarbon intervals are considered of commercial value to warrant the completion and ultimate production of the well. This will be done by running a 7 5/8′ production liner and suspension of the well for future production. The joint venture will now move forward with development planning and has already initiated discussions with an offset operator to cost effectively produce the hydrocarbons from this well.
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- 吴海君
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石油圈认证作者
- 毕业于中国石油大学(华东),油气田开发硕士,英语双学位。第一时间为您提供原创国际油气资讯,真实反映每时每刻新闻热点,秉承国际化视野,力求及时、客观、权威、独立地报道新闻。