- Title : Workover Well Control Manual by Chevron Petroleum Technology Company Drilling Technology Center
- Publish : Chevron Petroleum Technology Company
- Type Document : pdf
- Release : December 1994
- Total Page : 298 Page
- Size : 2.31 Mb
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Decrypted Contents
INTRODUCTION AND RESPONSIBILITIES
INTRODUCTION
The primary goal of every completion and workover operation is to complete the task in a safe and efficient manner without detrimental effects to the environment. This goal can only be accomplished if control of the well is maintained at all times. In order to comprehend Completion/Workover Well Control, we must first understand a few basic terms:
This operation is performed at the completion of drilling operations to establish initial production from or injection into a well. There are many different types of completions utilized around the world. Examples include: open hole, cased hole perforated, single string, dual string, and gravel packed completions. Completion procedures will vary depending on the completion type and the area. In some areas, flowing wells can simply be perforated and put on production. In other areas, the wells may require stimulation treatments such as acid or frac jobs to produce at economic rates. Sometimes wells are completed in multiple zones in order to establish commercial production. Wells in low pressure areas often require an artificial lift mechanism (rod or submersible pump, gas lift valves, etc.) to produce at economic rates.
The primary goal of every completion and workover operation is to complete the task in a safe and efficient manner without detrimental effects to the environment. This goal can only be accomplished if control of the well is maintained at all times. In order to comprehend Completion/Workover Well Control, we must first understand a few basic terms:
- Well Completion
- Well Workover
- Kick
- Blowout
This operation is performed at the completion of drilling operations to establish initial production from or injection into a well. There are many different types of completions utilized around the world. Examples include: open hole, cased hole perforated, single string, dual string, and gravel packed completions. Completion procedures will vary depending on the completion type and the area. In some areas, flowing wells can simply be perforated and put on production. In other areas, the wells may require stimulation treatments such as acid or frac jobs to produce at economic rates. Sometimes wells are completed in multiple zones in order to establish commercial production. Wells in low pressure areas often require an artificial lift mechanism (rod or submersible pump, gas lift valves, etc.) to produce at economic rates.
1.2 Well Workover
This operation is performed after the initial completion to either reestablish commercial production or injection, repair a mechanical problem in the well, or plug and abandon the well. Workover operations are usually initiated when hydrocarbon production rates decline substantially. Completions and workover operations are alike in that they vary depending on the type of well and the area. They can be as simple as changing out pumps in a rod job, or as complex as a multiple zone recompletion with a three or four-stage stimulation treatment. Sometimes workovers are done to control excessive water or gas production. Undesired water or gas production could be the result of a poor primary cement job or water/gas coning. These types of workovers typically involve a remedial cement job to control the unwanted water/gas production. Another common cause for remedial work is mechanical (tubing/casing) failures. These failures are often the result of erosion or corrosion occurring in the wellbore.
1.3 Kick
A kick is an influx, or flow, of formation fluids into the well. The successful detection and handling of kicks is extremely important
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