Dans l'industrie pétrolière et gazière, le terme "poursuite" désigne une opération cruciale utilisée pour déterminer l'état ouvert d'un puits. Ce processus consiste à faire passer un tuyau à travers le puits afin d'évaluer sa perméabilité et d'identifier toute obstruction ou blocage potentiel.
Le But:
L'objectif principal d'une opération de poursuite est de confirmer l'accessibilité du puits et sa capacité à accueillir l'intervention prévue. Elle permet de déterminer :
Le Processus:
L'opération de poursuite implique plusieurs étapes clés:
Types d'Opérations de Poursuite:
En fonction du but et des conditions, différents types d'opérations de poursuite sont utilisés:
Avantages:
Conclusion:
La poursuite est une partie essentielle de la gestion des puits, assurant des opérations efficaces et sûres. En comprenant son but, son processus et ses différents types, les professionnels de l'industrie peuvent prendre des décisions éclairées et optimiser les performances des puits pour une productivité et une rentabilité maximales.
Instructions: Choose the best answer for each question.
1. What is the primary goal of a chasing operation? a) To clean out debris from the wellbore. b) To measure the exact depth of the well. c) To determine the wellbore's accessibility and identify obstructions. d) To stimulate oil production in the well.
c) To determine the wellbore's accessibility and identify obstructions.
2. Which type of chasing operation involves running the pipe against an obstruction to test its resistance? a) Simple Chase b) Bumping Chase c) Wireline Chase d) Casing Chase
b) Bumping Chase
3. What is the main benefit of conducting a chasing operation? a) Increased oil production. b) Reduced downtime and improved safety. c) Accurate measurement of the well's depth. d) Easier access to the wellbore for maintenance.
b) Reduced downtime and improved safety.
4. What type of pipe is typically used for chasing operations? a) Plastic tubing b) Wooden beams c) Steel drill pipe or casing d) Aluminum wire
c) Steel drill pipe or casing
5. Which of the following is NOT a type of chasing operation? a) Simple Chase b) Bumping Chase c) Wireline Chase d) Drilling Chase
d) Drilling Chase
Scenario:
You are an engineer preparing for a planned workover operation in a well. A recent chasing operation revealed the following data:
Task:
Analysis: The chasing operation indicates a potential obstruction or blockage at 7,800 ft, preventing the casing from reaching the target depth of 8,500 ft. This could be due to: * **Debris or sediment buildup:** A significant amount of debris or sediment might have accumulated in the wellbore. * **Collapsed casing:** A section of the casing might have collapsed, partially blocking the passage. * **Stuck equipment:** Previously used equipment might be lodged in the wellbore. * **Unexpected formation changes:** Unexpected changes in the formation might be creating a tighter passage for the casing.
Potential issues for the workover operation: * **Inability to reach the target depth:** The obstruction might prevent the necessary equipment from reaching the intended zone. * **Increased risk of equipment damage:** Running equipment against the obstruction could cause damage to the equipment or the wellbore. * **Delayed operation:** Time and effort might be required to remove the obstruction before proceeding with the workover operation.
Suggested Actions: * **Further investigation:** Conduct a detailed investigation using wireline logging or other appropriate methods to determine the exact nature of the obstruction. * **Removal of the obstruction:** If feasible, attempt to remove the obstruction using specialized tools or techniques. * **Alternative intervention plan:** If removing the obstruction is not possible or too risky, consider an alternative intervention plan that accommodates the existing condition. * **Safety precautions:** Implement safety protocols to minimize risks associated with working around the obstruction.
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