Otto Energy有限公司日前宣布,運營商Byron Energy已完成了SM-71 #1井的鉆井工作。該井位于Marsh島南部的71區塊,最終鉆進垂深為6843英尺(2086米)或者6477英尺(1974米)。
在鉆探過程中,鉆遇了大量的含烴砂層并利用了隨鉆測量工具進行了初步的評價。以下是觀測到的含烴砂層記錄情況:
I3砂-含烴總砂層厚度約為20英尺(6米)
J砂-含烴總砂層厚度約為30英尺(9米)
D5砂-含烴總砂層厚度約為100英尺(3米)
D5砂層間隔的碎屑以及含烴層的濕氣比例增加,表明鉆遇層含有原油。
初步解釋結果表明這些含烴砂巖中有很大比例是純烴層,但只有通過孔隙度測井后才可確定純烴層的厚度,其厚度可能小于現在測量的總砂層厚度。
這口探井的主要目標層是油藏條件較好的D5砂層,該砂層的實際鉆遇深度在預期范圍之內,采用RTM技術對該砂層進行了油藏描述。探井的次要目標層J砂層,該砂層的實際鉆遇深度也在預期范圍之內,該探井的位置在J砂層產量最高井斜上方220英尺(67米)處。SM 71探邊井的I3砂巖隔層還未開始生產。
當前操作是挖一個小孔來處理多余的井壁泥餅,并在孔隙度測井前再核實下小孔的情況。當鉆遇到D5砂層下方時,壓力的變化需要增加泥漿的密度來控制鉆進。較大的泥漿密度可抑制氣體進入,但也需要考慮井筒的實際條件。
這三個分散隔層的初步結果表明該探井有一定產量可進行商業開發??紤]以后的開發情況,可采取間歇生產和停井等措施。合資公司緊緊圍繞發展規劃并已與經營商探討如何高效開發這口探井。
來自/WorldOil ?4月21日消息 ?編譯/吳海君
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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