Rock Properties Review

So = pore volume

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Wettability is the tendency of one fluid to spread on or adhere to a solid surface; it depends on IFT and can be influenced by changing the type of rock or fluid, or adding chemicals such as surfactants.

<p>IFT determines the wettability condition in a rock-fluid system.</p> Signup and view all the answers

<p>By adding chemicals such as surfactants, polymers, corrosion inhibitors, or scale inhibitors.</p> Signup and view all the answers

<p>The sum of the volumes of oil, water, and gas in a rock is equal to the pore volume.</p> Signup and view all the answers

<p>Porosity (∅)</p> Signup and view all the answers

<p>Hydrocarbon porosity</p> Signup and view all the answers

<p>10% to 40%</p> Signup and view all the answers

<p>Absolute porosity includes all pore space, while effective porosity only includes interconnected pore space.</p> Signup and view all the answers

<p>∅a = (total pore volume) / (bulk volume)</p> Signup and view all the answers

<p>To determine the percentage of interconnected pore space with respect to the bulk volume.</p> Signup and view all the answers

<p>The fraction, or percent, of the pore volume occupied by a particular fluid (oil, gas, or water).</p> Signup and view all the answers

<p>Porosity is used to calculate the original hydrocarbon volume in place, which is critical for estimating the reservoir's hydrocarbon reserves.</p> Signup and view all the answers

<p>$𝜎𝑜𝑠 − 𝜎𝑤𝑠 = 𝜎𝑜𝑤 cos 𝜃$</p> Signup and view all the answers

<p>It is the pressure difference across the curved interface formed by two immiscible fluids in a small capillary tube.</p> Signup and view all the answers

<p>Water-oil capillary pressure (𝑃𝑐𝑤𝑜), Gas-oil capillary pressure (𝑃𝑐𝑔𝑜), and Gas-water capillary pressure (𝑃𝑐𝑔𝑤)</p> Signup and view all the answers

<p>It is a property of the porous medium that measures the capacity and ability of the formation to transmit fluids.</p> Signup and view all the answers

<p>To understand the interaction between the solid surface and the fluid phases.</p> Signup and view all the answers

<p>𝜎𝑜𝑠 is the interfacial energy between oil and solid, while 𝜎𝑤𝑠 is the interfacial energy between water and solid.</p> Signup and view all the answers

<p>It is a measure of the degree of wetting between the fluid and the solid surface.</p> Signup and view all the answers

<p>𝑃𝑐 = 𝑃𝑛𝑤 − 𝑃𝑤</p> Signup and view all the answers

<p>The ability of a rock to transmit a single fluid when it is 100% saturated with that fluid.</p> Signup and view all the answers

<p>Effective permeability refers to the presence of two fluids in a rock, while absolute permeability refers to the transmission of a single fluid when the rock is 100% saturated with that fluid.</p> Signup and view all the answers

<p>Relative permeability is the ratio between effective permeability of a fluid at partial saturation and the permeability at 100% saturation (absolute permeability).</p> Signup and view all the answers

<p>Rock-matrix compressibility, rock-bulk compressibility, and pore compressibility.</p> Signup and view all the answers

<p>Rock-matrix compressibility is the fractional change in volume of the solid rock material (grains) with a unit change in pressure.</p> Signup and view all the answers

<p>𝐜𝒓 = - (1/𝑉𝑟) * (𝜕𝑉𝑟/𝜕𝑝) 𝑇</p> Signup and view all the answers

<p>Rock-bulk compressibility refers to the fractional change in volume of the bulk volume of the rock, while rock-matrix compressibility refers to the fractional change in volume of the solid rock material.</p> Signup and view all the answers

<p>𝐜𝐁 = - (1/𝑉𝐵) * (𝜕𝑉𝐵/𝜕𝑝) 𝑇</p> Signup and view all the answers