Class II Well Inspections · 2019-08-09 · Slimhole Class II Injection Well Completion. Dual...
Transcript of Class II Well Inspections · 2019-08-09 · Slimhole Class II Injection Well Completion. Dual...
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Class II Well InspectionsClass II well classificationClass II well construction requirementsTypes of inspectionsOperating and Monitoring requirements
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Class II Well Classification
IIR – Enhanced recovery wells
• Used for the secondary or tertiary recovery of oil and gas and for the maintenance of reservoir pressure
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Class II Well Classification
IID – Salt water disposal wells
• Disposal of salt water (brine) produced from oil and gas production wells
• Disposal of other waste streams associated with oil and gas production
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Class II Well Classification
IIH – Hydrocarbon storage wells
• Inject hydrocarbons that are liquid at standard temperature and pressure.
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IID - Bevill Amendment
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• New Class II wells inject into a formation separated from any USDW by confining zones free of faults and fractures.
• All Class II wells are cased and cemented to prevent movement of fluids into or between USDWs.
• Casing and cement for newly drilled wells shall be designed for the life expectancy of the well.
• Casing and cement programs shall consider factors such as: location of USDWs, pressures, formation fluids, lithology.
Class II WellConstruction Requirements
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Well Construction Technology1st Step: Surface Casing
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2nd Step: Intermediate or Long String Casing
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3rd Step: Well Perforation
Tubing and Packer
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Class IIInjection Well
Completion Method
Perforated Cased Hole
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Conventional Class IIInjection Well Completion
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Packerless Class II Injection Well Completion
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Tubingless Class II Injection Well Completion
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Slimhole Class II Injection Well Completion
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Dual Completion Class II Injection Well Completions
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Types of Inspections• Routine or operational• Drilling/Workover• Well logging/Testing• Frac job• Plugging and abandonment• Compliance and enforcement• Sampling• Citizen complaint
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PREP for INSPECTIONS
• Well Construction (downhole & surface)• Operating Limits (pressures/rates/vol)• Site Access (locked/gated/etc.)• Equipment Needs (gauges/tools, PPE)• Operator contact information
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Typical Operating and Monitoring Requirements• Injection pressure• Flow rate and cumulative volume• Fluid analysis• Annular pressure • Shut-in Equipment• Flowback (check valve)
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Surface Equipment
FlowlinesWellheads / CellarsTanksPressure GaugesFlowmetersVolume MetersSCADA DevicesShut-In Devices
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Wellheads and Gauges• CO2
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Wellheads and Gauges• SWD
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Wellheads• SWD
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Wellheads• SWD
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Wellsite
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Wellsite
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Wellsite
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SCADA Systems
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Flow Meters
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Volume Counters
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CombinationMeters
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Shut-in Devices
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Chart Recorders
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Chart Recorders
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Frac Pressures/Gradient
• Frac Gradient is presented in psi/ft• Reflects the frac pressure at depth• Best Measured with a Step Rate Test
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Frac Pressures/Gradient
• Frac Pressure is the pressure at the formation face that causes the formation to fracture
• Two pressures contribute to the bottom hole pressure:– Hydrostatic head of the fluid column– Surface pressure (injection pressure)
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Frac Pressures/Gradient
• Hydrostatic Head contribution:
Must know fluid contribution to psi– Depth– Specific Gravity
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Frac Pressures/Gradient
• Hydrostatic Head contribution:
Ph = (SG) (0.433 psi/ft) (D ft)
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Frac Pressures/Gradient
• Hydrostatic Head contribution:
Ph = (SG) (0.433 psi/ft) (D ft)
• For a 5000 ft well, with a SG = 1.003
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Frac Pressures/Gradient
• Hydrostatic Head contribution:
Ph = (SG) (0.433 psi/ft) (D ft)
• For a 5000 ft well, with a SG = 1.003Ph = (1.003) (0.433) (5000)Ph = 2171 psi
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Frac Pressures/Gradient
• If you know the frac gradient of your injection formation, the hydrostatic head contributes to that pressure, the remainder is added at the surface.
• If your frac gradient is 0.765 psi/ft, how much surface pressure can be added to the previous well example before frac?
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Frac Pressures/Gradient
• For a 0.765 psi/ft frac gradient, the frac pressure at the formation face is:
Pf = (0.765 psi/ft)(5000 ft)• Pf = 3825 psi
• Ph = 2171 psi(from example)• Pmax = 3825 – 2171 = 1654 psi
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