Term
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Definition
| Ratio of the interconnected void colume in a rock sample to the bulk volume of the sample |
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Term
| End point oil relative permeability |
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Definition
| the ratio of effective oil permeability at the end of the oil flood (at irreducible water saturation) and a reference permeability (usually the absolute permeability) |
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Term
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Definition
| the first appearance of water in the effluent during a waterflood |
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Term
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Definition
| the oil saturation remaining at the end of a waterflood that cannot be reduced by continuing the water flood |
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Term
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Definition
| injectivity of water at any point in the flood divided by the initial injectivity at the start of the flood |
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Term
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Definition
| the effective permeability of a fluid in the presence of another immiscible fluid divided by a reference permeability (usually the absolte permeability) |
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Term
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Definition
| total void space in a rock sample that can be occupied by a fluid |
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Term
| effluent concentration profile |
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Definition
| a graph showing the concentration of siplacing fluid in the core effluent plotted against pore volumes injected |
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Term
| refractive index vs concentration curve |
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Definition
| a graph showing the dependence of refractive index on the concentration of displacing fluid. it is used as a calibration curve to determine the concentration of dispalcing fluid in the effluent samples by measuring the refractive index |
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Term
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Definition
| a parameter that serves as a measure of the mixing of displaced and displacing fluids in a miscible displacement |
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Term
| Calculate porosity (method 3) |
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Definition
porosity = pore volume/ bulk volume.
pore volume = bulk volume - sand grains volume
volume = weight/density |
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Term
| Calculate porosity (method 2) |
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Definition
porosity = (mass of holder+sand+water - mass of holder+sand)/density of water
/bulk volume
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Term
| Calculate porosity (method 1) |
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Definition
| porosity = water imbibed/bulk volume |
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Term
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Definition
k = Q*u(w)*L/(A*deltaP/14.7)
Q = mL/s, L=cm, A=cm2, deltaP=kPa, u(w)=cp |
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Term
| calculate - irreducible water saturation |
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Definition
Swi= (water remaining in sand-pack)/pore volume.
water remaining in sand = pore volume - water displaced |
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Term
| end point relative permeability to oil |
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Definition
keo = Q*u(o)*L/(A*deltaP/14.7)
Q = mL/s, L=cm, A=cm2, deltaP=kPa, u(o)=cp
kro = keo/k |
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Term
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Definition
Sro= oil remaining in sandpack/pore volume
oil remaining in sand pack = initial oil volume - oil produced in water flood
initial oil volume = water displaced by oil |
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Term
| end point relative permeability to water |
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Definition
krw= Q*u(w)*L/(A*deltaP/14.7)
Q = mL/s, L=cm, A=cm2, deltaP=kPa, u(w)=cp
where deltaP is the final pressure drop |
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Term
| average water saturation in the sand pack after 25min of water injection |
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Definition
| average water saturation = irreducible water saturation + oil produced/pore volume |
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Term
| fractional flow of water at the producing end (fw2) after 25 min of water injection |
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Definition
oil produced from 26-24 min = ?
water injected = ?? (what's flowrate?)
water produced = ??-?
fw= (??-?)/?? |
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Term
| water saturation at the producing end (Sw2) after 25min of injection |
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Definition
| Sw2 = Sw - (PVI)(1-fw2) = Sw - (1-fw)*(t/injection rate/Pore volume) |
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Term
| relative permeability ratio (kro/krw) at the producing end after 25min of water injection |
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Definition
| kro/krw = (1-fw2)*u(o)/(fw2*u(w)) |
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Term
| List 4 mechanisms that cause longitudinal dispersion in porous media |
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Definition
1. molecular diffusion
2. velocity profile within a pore channel
3. different velocity in different proe channels
4. path length differences
5. pores acting as mixing cells
6. dead end pores |
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Term
| list 4 possible sources of error in the measurement of dispersion coefficient as practiced in miscible displacement experiment |
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Definition
1. volume in fittings and tubing that becomes a part of the displaced volume
2. insufficient purging of the connecting lines by the displacing fluid
3. bypassing of the fluid between the sleeve and the core plug
4. incorrect calibration curve
5. error in measurements of refractive index
6. incorrect calculations |
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Term
| most of the curves in the lab deviated from the perfect symmetry of the S curve. list 2 mechanisms that would cause the effluent concentration profile to lose that. |
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Definition
1. dead volume in fittings and tbg that becomes a part of the displaced volume
2. dead end pores in the core
3. incorrect calibration curve
4. bypassing of the fluid between the sleeve and the core plug |
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Term
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Definition
| ability of a single fluid to flow in a porous medium in darcy. |
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Term
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Definition
| ability of one fluid to flow in porous medium in presence of other fluids. |
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Term
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Definition
density = mass of glass beeds/grain volume
grain volume = bulk volume - pore volume |
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