Dans le monde complexe de l'extraction pétrolière et gazière, assurer un placement efficace et précis des fluides dans les puits est crucial pour maximiser la production et minimiser les risques opérationnels. Une technique gagnant en popularité à cet effet est le **Lavage Marché**, une méthode précise utilisant un tubing enroulé (CT) pour délivrer des fluides directement aux zones cibles.
Un Lavage Marché consiste à injecter un fluide dans le puits via un tubing enroulé, où le fluide est stratégiquement "déposé" au bas de la zone cible. L'élément clé de cette technique est le retrait simultané du tubing enroulé au même rythme que le puits est rempli. Ce mouvement contrôlé et synchronisé garantit que le fluide est distribué uniformément dans la zone prévue sans déplacement excessif ni contournement.
La technique du Lavage Marché trouve son application dans divers scénarios, notamment :
La technique du Lavage Marché offre une méthode fiable et efficace pour le placement précis des fluides dans les puits de pétrole et de gaz. Cette technique présente de nombreux avantages par rapport aux méthodes conventionnelles, notamment un placement ciblé, un risque réduit de dommages de formation, une productivité améliorée et une rentabilité. Alors que l'industrie continue de se concentrer sur l'optimisation des performances des puits et la minimisation de l'impact environnemental, le Lavage Marché est susceptible de devenir de plus en plus pertinent dans les années à venir.
Instructions: Choose the best answer for each question.
1. What is the primary purpose of the Walking Wash technique?
a) To remove debris from the wellbore. b) To inject fluids at high pressure to stimulate the formation. c) To precisely place fluids at a specific target zone in the wellbore. d) To measure the pressure and flow rate of the well.
c) To precisely place fluids at a specific target zone in the wellbore.
2. How does the Walking Wash technique ensure precise fluid placement?
a) By using a high-pressure pump to force the fluid into the wellbore. b) By injecting the fluid at a constant rate. c) By simultaneously injecting and withdrawing coiled tubing at the same rate. d) By using a special type of fluid that is less likely to bypass the target zone.
c) By simultaneously injecting and withdrawing coiled tubing at the same rate.
3. What is a key advantage of the Walking Wash technique compared to conventional squeeze operations?
a) It can be used to reach deeper target zones. b) It is more environmentally friendly. c) It reduces the risk of formation damage. d) It is more efficient at removing debris from the wellbore.
c) It reduces the risk of formation damage.
4. Which of the following scenarios is NOT a potential application of the Walking Wash technique?
a) Acidizing to remove scale from the formation. b) Cementing to isolate different zones in the wellbore. c) Drilling a new well. d) Placing plugging agents to seal off unwanted zones.
c) Drilling a new well.
5. What is a potential benefit of using the Walking Wash technique for well stimulation?
a) It can be used to reach deeper target zones. b) It reduces the risk of formation damage. c) It is more environmentally friendly. d) It can increase well productivity by ensuring fluids reach the intended zones effectively.
d) It can increase well productivity by ensuring fluids reach the intended zones effectively.
Scenario: An oil well is experiencing a decline in production due to water influx. The operator decides to implement a Walking Wash technique to place a water shutoff agent in the target zone.
Task: Describe the steps involved in executing the Walking Wash procedure for this scenario, considering the following:
**Preparation:** * **Well Analysis:** Analyze the well logs and production data to identify the water-bearing zone and its characteristics. * **Fluid Selection:** Choose the appropriate water shutoff agent based on the well conditions and formation type. * **Equipment Preparation:** Assemble and test the coiled tubing system, including the pump, flow rate control devices, and injection tools. * **Safety Measures:** Implement necessary safety protocols and ensure the crew is properly trained on the procedure. **Procedure:** 1. **Coiled Tubing Deployment:** Lower the coiled tubing into the wellbore to the target zone. 2. **Injection and Withdrawal:** Simultaneously inject the water shutoff agent and withdraw the coiled tubing at the same rate, ensuring even distribution of the agent within the target zone. 3. **Injection Completion:** Once the target zone is fully filled with the agent, monitor the pressure and flow rate to ensure the fluid is properly placed. **Monitoring:** * **Production Monitoring:** Monitor the well production for changes in water cut and oil production after the treatment. * **Pressure Monitoring:** Track the pressure in the wellbore to identify any potential issues or fluid bypassing. * **Downhole Temperature Monitoring:** Monitor the temperature at the injection point to detect any potential heat generation during the reaction of the water shutoff agent. * **Log Analysis:** Run a log after the treatment to confirm the successful placement of the agent and evaluate the effectiveness of the water shutoff.
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