PETE 101 - Unit 4 - Fathi - PETROLEUM ENGINEERING...

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PETROLEUM ENGINEERING Introduction to Petroleum Engineering [PETE 101] Well Completion Unit 4 Dr. Fathi H. Boukadi
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03/23/14 2 PETROLEUM ENGINEERING After Drilling Dry well Producer/Discovery P&A Plug & Abandon Cement plugs Well Completion Before production 1. Final casing (run & cemented) 2. Casing perforated 3. Stimulation (if needed) 4. Tubing, packers, Christmas tree Also done for some exploration wells with discovery. WHY? Your Boss Your Boss Your Project Your Project
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03/23/14 3 PETROLEUM ENGINEERING Casing Primary Cementing Perforating the Casing Well Stimulation Sand Control Equipping the Well to Produce Well Completion
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03/23/14 4 PETROLEUM ENGINEERING Well Completions (& Stimulation) Completion = Finishing Casing Primary Cementing “Cased Hole”--Perforate the Casing “Open Hole”—no casing over production interval (this example) Sand Control Equipping the Well to Produce Stimulation = improve on low flow rate Low natural flow capacity Low flow due to formation damage Production String Cemented (in this example)
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03/23/14 5 PETROLEUM ENGINEERING Run the final string of casing and cement it in place. If not done previously. Perforate the casing at the required depth (may be done at one or more depth intervals). Stimulate the zone to increase production rate and/or gravel-pack to control sand production—or both. If needed Equip the well with production tubing, packers and a Christmas tree (and a pump, if required). Typical Completion Sequence
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03/23/14 6 PETROLEUM ENGINEERING Surface casing protects potable water zones Protects hole from mud by preventing swelling of shales, erosion of unconsolidated formations, hole collapse, fracturing of shallow zones by heavy mud Provides a smooth path for running tools in and out of the hole Casing and cement isolates downhole zones separate production from multiple reservoirs in same well perforations allow producing interval to be carefully placed e.g. to reduce water or gas production Casing: Multiple joints of large diameter steel pipe screwed together Purpose of Casing
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03/23/14 7 PETROLEUM ENGINEERING Separate production from multiple reservoirs in same well Perforations allow producing interval to be carefully placed e.g. to reduce water of gas production Purpose of Casing
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03/23/14 8 PETROLEUM ENGINEERING Casing Program Onshore
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03/23/14 9 PETROLEUM ENGINEERING Casing Program Surface casing is large diameter, typically several hundred feet long Subsequent intermediate casing strings are added as required New casing strings are run inside earlier strings, so the well gets narrower with depth The final production casing (“long” or “oil” string)
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