Dans l'industrie pétrolière et gazière, le terme « cordage de travail » fait référence à un ensemble spécialisé de tubulaires qui jouent un rôle crucial lors de la phase d'achèvement d'un puits. Ce cordage est généralement distinct du tubing de production utilisé pour extraire les hydrocarbures, conçu pour gérer des pressions plus élevées et des charges plus lourdes pendant le processus critique d'achèvement du puits.
Qu'est-ce qu'un cordage de travail ?
Un cordage de travail est essentiellement un système de tubage temporaire et spécialisé qui est descendu dans le puits pendant diverses opérations d'achèvement. Il sert de conduit pour les outils, les fluides et l'équipement nécessaires à une gamme de tâches telles que :
Pourquoi utiliser un cordage de travail ?
Les raisons d'utiliser un cordage de travail plutôt que le tubing de production pendant ces opérations critiques sont multiples :
Types de cordages de travail :
Les cordages de travail peuvent être classés en fonction de leur objectif et de leur application spécifiques. Les types courants comprennent :
Conclusion :
Les cordages de travail sont des outils essentiels à la réussite de l'achèvement des puits de pétrole et de gaz. Leur conception et leurs capacités uniques permettent aux opérateurs d'effectuer des tâches critiques de manière sûre et efficace, contribuant en fin de compte à la production efficiente et rentable des hydrocarbures. Comprendre les nuances de la sélection et du fonctionnement des cordages de travail est essentiel pour tout professionnel impliqué dans les opérations d'achèvement des puits.
Instructions: Choose the best answer for each question.
1. What is the primary function of a work string in well completion?
a) To extract hydrocarbons from the reservoir. b) To act as a temporary conduit for tools, fluids, and equipment during completion operations. c) To support the weight of the wellhead and surface equipment. d) To provide a permanent pathway for production fluids.
b) To act as a temporary conduit for tools, fluids, and equipment during completion operations.
2. Why are work strings typically designed with thicker walls and stronger materials than production tubing?
a) To resist corrosion from production fluids. b) To withstand the high pressures generated during completion operations. c) To accommodate the weight of the wellhead. d) To ensure a smooth flow of hydrocarbons.
b) To withstand the high pressures generated during completion operations.
3. Which of the following is NOT a typical task performed using a work string?
a) Cementing the wellbore. b) Stimulation of the reservoir. c) Installing downhole equipment. d) Monitoring the well's production rate.
d) Monitoring the well's production rate.
4. What type of work string is specifically designed for high-pressure cementing operations?
a) Stimulation string. b) Production testing string. c) Cementing string. d) Completion string.
c) Cementing string.
5. Which of the following statements is TRUE regarding work strings?
a) They are typically designed for permanent use in the wellbore. b) They are used only for stimulation operations. c) They are always made of the same materials as production tubing. d) They are temporary tubing systems used during various completion operations.
d) They are temporary tubing systems used during various completion operations.
Scenario:
You are a well completion engineer working on a new oil well. The well will be completed with a production tubing string made of 2-7/8" OD, 6.5 lb/ft tubing. The completion plan includes the following operations:
Task:
Based on the given information, choose the appropriate work string for each operation and explain your rationale.
Available Work Strings:
Hint: Consider the pressure requirements, weight handling capacity, and the need for specialized components for each operation.
Here's a possible breakdown of work string selection:
Rationale:
Selecting the appropriate work string ensures safe and efficient completion operations. The choice should consider the specific pressures and weights involved in each operation, as well as the need for specialized components like injection ports or pressure-rated features.