إن فهم باطن الأرض أمر بالغ الأهمية لنجاح عمليات حفر الآبار وإكمالها. بينما توفر عينات النوى التقليدية رؤى قيّمة، إلا أنها غالبًا ما تأتي مع بعض القيود، بما في ذلك:
هنا يأتي دور نوى الجدار الجانبي كأداة قيّمة. توفر هذه العينات الصغيرة، المستخرجة من جدار البئر، معلومات حيوية حول التكوين دون إيقاف عمليات الحفر.
تُستخدم طريقتان رئيسيتان للحصول على نوى الجدار الجانبي:
1. النوى المسترجعة عن طريق التفجير:
2. النوى المٌحفرّة بالطرق الدورانية:
البيانات المكتسبة من نوى الجدار الجانبي ذات قيمة كبيرة لمختلف الأغراض:
أمثلة على كيفية استخدام نوى الجدار الجانبي:
نوى الجدار الجانبي أداة لا غنى عنها في عمليات حفر الآبار وإكمالها الحديثة. توفر بيانات جيولوجية قيّمة دون إعاقة عملية الحفر بشكل كبير. من خلال تقليل وقت التوقف وتعظيم جمع المعلومات، تساهم نوى الجدار الجانبي بشكل كبير في نجاح مشاريع استكشاف وإنتاج النفط والغاز بشكل عام.
Instructions: Choose the best answer for each question.
1. What is the primary advantage of sidewall cores compared to conventional core samples?
a) Sidewall cores are always more accurate than conventional cores. b) Sidewall cores can be obtained from various depths without interrupting drilling. c) Sidewall cores are cheaper and faster to obtain than conventional cores. d) Sidewall cores can be used to analyze the entire formation, while conventional cores only analyze specific zones.
b) Sidewall cores can be obtained from various depths without interrupting drilling.
2. What is the primary disadvantage of using explosively retrieved sidewall cores?
a) They are too expensive to be a viable option. b) They can damage the formation and compromise the reliability of data. c) They are too time-consuming to obtain. d) They can only be used for a limited number of depths.
b) They can damage the formation and compromise the reliability of data.
3. Which of the following is NOT a potential application of sidewall core data?
a) Determining the presence of hydrocarbons in a formation. b) Identifying the type of rock present in a formation. c) Analyzing the fluid content of a formation. d) Optimizing wellbore placement and casing design.
c) Analyzing the fluid content of a formation.
4. What is a major advantage of rotary-drilled sidewall cores over explosively retrieved cores?
a) Rotary-drilled cores are less expensive than explosively retrieved cores. b) Rotary-drilled cores are faster to obtain than explosively retrieved cores. c) Rotary-drilled cores provide more accurate data due to less formation disturbance. d) Rotary-drilled cores are more reliable for analyzing fluid content.
c) Rotary-drilled cores provide more accurate data due to less formation disturbance.
5. Which statement best summarizes the importance of sidewall cores in drilling and well completion?
a) They are a necessary replacement for conventional core samples. b) They offer a cost-effective way to gather information about the formation without significant downtime. c) They are crucial for understanding the fluid content of the formation. d) They are only useful for determining the presence of hydrocarbons.
b) They offer a cost-effective way to gather information about the formation without significant downtime.
Scenario: You are a geologist analyzing sidewall core data from a newly drilled well. The data reveals the following:
Task: Based on this data, assess the potential of this zone for hydrocarbon production. Consider the following factors:
Write a brief report outlining your analysis and concluding whether this zone shows potential for hydrocarbon production.
Report: Analysis of Sidewall Core Data at 2,500 meters This report analyzes the sidewall core data obtained at a depth of 2,500 meters to assess the potential for hydrocarbon production in this zone. **Analysis:** * **Rock Properties:** The core sample reveals a sandstone formation with 15% porosity and 25 millidarcies permeability. These values indicate a reasonably porous and permeable rock, suggesting potential for fluid flow. * **Fluid Saturation:** The core sample shows 80% oil saturation and 20% water saturation. This indicates a good oil reservoir potential with a relatively low water cut. * **Depth:** A depth of 2,500 meters suggests a significant reservoir pressure, which would contribute to a favorable flow potential. **Conclusion:** Based on the analysis of sidewall core data, this zone at 2,500 meters exhibits potential for hydrocarbon production. The sandstone formation has favorable porosity and permeability values, with a high oil saturation and a depth that indicates potential for good reservoir pressure. Further investigations, including comprehensive well testing, are recommended to confirm the potential of this zone for commercial production.
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