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Similar to HTHP Cementing Considerations for Reservoirs Above 325°F
Similar to HTHP Cementing Considerations for Reservoirs Above 325°F (20)
HTHP Cementing Considerations for Reservoirs Above 325°F
- 18. Hydrostatic Pressure Loss Cement Fluid Cement Gels Cement Hardens Cement Sets Formation Gas Pressure Overbalance Pressure Time Hydrostatic Pressure
- 24. Overbalance Pressure Is Lost Due To The Combined Effects Of: 1. Static Gel Strength 2. Volume Loss
- 26. Static Gel Strength is the Internally Developed Rigidity Within the Matrix Which Resists Forces Placed Upon It
- 27. Actual Pressure Loss Is Not Caused By Static Gel Strength Alone. It Must Be Accompanied By Volume Loss
- 31. Maximum SGS for Gas Flow 0 100 200 300 400 500 0 20 40 60 80 Time (minutes) Static Gel Strength (lbs/100 ft 2 ) No Gas flow Gas Flow
- 32. Flow Potential Factor FPF = MPR / OBP MPR = ( 500 / 300) x (L / D)
- 33. GAS FLOW POTENTIAL Blowout Negligible Redesign Flow Condition 1 “ Minor” Flow Condition 2 “ Moderate” Flow Condition 3 “ Severe” < 0 0 – 1 1 – 4 5 – 7 8 – 15 > 15
- 38. Thixotropic Cement Normal Cement Thixotropic Cement
- 39. Delayed Gel Strength and Fluid Loss Normal Cement Fluid Loss Rate Gas Stop
- 41. Cement w/ insitu gas generators Cement Fluid Cement Gels Cement Hardens Cement Sets Formation Gas Pressure Overbalance Pressure Time Hydrostatic Pressure
- 42. Halliburton Gas Flow Solutions Minor GFP Moderate GFP Severe GFP
Editor's Notes
- 8
- 9
- 10 Cement Sheath Integrity - New area of focus (Foam; Flexcem) may need ductile cement if large amount of temperature & psi cycling is present
- 10 Wellbore Temperature, to have an accurate reading of the BHST temperature and an accurate calculation of the BHST is important as both effect the setting of cement.
- 10 Slurry Density, maintaining designed density in HPHT applications is important. A pressurized Mud Scale must be used to measure the density of the slurry while being mixed.
- 11 CAHT-1 is an anti-gellation additive developed mainly for the poor quality cements that tend to gel up before setting at high temperatures. Strong retarder so it cannot be used at low temperatures. ‘Humping’ problem is due to low quality cements.
- 12 Tricalcium Silicate and Dicalcium Silicate hydrate and form Calcium Silicate Hydrate (CSH) Gel and hydrated lime. Above 230 deg F CSH Gel converts to Dicalcium Silicate Hydrate which results in loss of compressive strength and increased permeabiltiy.
- 13 If slurry is thinned too much on surface then problems downhole will occur with the slurry. Thermal thinning will take place and farther damage the slurry. Creating a slurry on surface to avoid this problem will cause the slurry to be more viscous but it is necessary in order to maintain the slurry viscosity downhole.
- 13 Cannot use conventional GasStop above 250 o F for gelation control. Above 200 o F GasStop becomes unpredictable.
- 13 Cannot use conventional GasStop above 250 o F for gelation control. Above 200 o F GasStop becomes unpredictable.
- SSA-1=> limited on density Use SSA-2 for densified slurries. Sand adds strength to cement slurries as silica does for glass when heated.
- North Sea,Africa,Europe Microblock is the same as Silicalite as per Dan Bour!
- North Sea,Africa,Europe Microblock is the same as Silicalite as per Dan Bour!
- North Sea,Africa,Europe Microblock is the same as Silicalite as per Dan Bour!
- 20 Attapulgite - Also known as “salt-gel”, and occurs as fibrous needles which provide viscosity by association when they become dispersed in water. Unlike bentonite, no improvement in fluid-loss control is obtained when attapulgite is present in the slurry.
- Related to previous slide.