Exercise 10 Cement Flow Regime-1

Exercise 10 Cement Flow Regime-1 - Lab Report 10 Cement...

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Unformatted text preview: Lab Report 10 Cement Testing Title: Cement Testing and Flow Modeling Purpose: Compute the flow velocity and the pump rate necessary to create turbulent flow of a given cement slurry. Discuss general properties of the cement. References: See the attached discussion of fluids. MEMO TO: Drilling Department FROM: District Engineer RE: General Well Planning Please perform the following tasks in preparation for the annual planning meeting. Cement Density API Filtrate Blow Thru Viscometer Readings 10 min Gel Free Water (ppg) (ml/30 min) (min) 300 rpm 200 rpm 100 rpm 6 rpm (lb/100 sqft) Content (%) H neat 16.3 180 2.5 68 55 39 16 21 2.4 H + 0.6% Halad 344 15.8 trace NA 129 90 50 5 3 0.0 H + 10% NaCl 16.5 72 NA 58 47 35 16 18 2.2 50% H + 50% Poz 14.1 48 NA 29 24 19.5 12.5 11 3.2 H + 2% Econolite 11.1 133 1.92 21 17 14 7 14 4 H + 8% Bentonite 13.4 116 0.5 152 141 132 60 53 1 Table 1 Cement Data Casing OD Weight Grade Coupling Hole Size (in) (ppf) (in) 4 1/2 11.6 N-80 LTC 7 7/8 Table 2 Well Data A variety of cement slurries have been tested and are to be considered for use in the up coming wells. The results of the tests are shown in Table 1 (1) A low water loss slurry is required for cement used to seal productive intervals. Which of the six slurries are acceptable? Please explain the data that leads to your choice or choices. (2) Using the density of each slurry, prepare a table that shows the pressure gradient in psi/ft for each slurry. (3) Using data for the lowest water loss slurry and using the Bingham Plastic flow model: (a) Prepare a graph of shear stress (lb/100 sqft) versus shear rate (1/sec). (b) Determine from the graph the plastic viscosity (cp) and the yield point (lb/100 sqft). (c) calculate the critical flow velocity (ft/sec) for annular flow (d) calculate the critical pump rate (bbl/min) for annular flow Please submit your findings in MEMO form within one week. Fluid Models: Viscometer tests will determine the shear stress of the slurry at different shear rates. These data will be used to determine the proper flow model to describe the slurry. The proper flow model will be used to determine the friction loss associated with the slurry at various pumping rates and predict the critical flow rate needed to create turbulent flow. various pumping rates and predict the critical flow rate needed to create turbulent flow....
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Exercise 10 Cement Flow Regime-1 - Lab Report 10 Cement...

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