Thermal Recovery (Monograph, Volume 7) If searched for the book Thermal Recovery (Monograph, Volume 7) by Michael Prats in pdf form, then you have. Cloud Of Ebook. Download Related Book Download Related Book. Prats; Thermal Recovery. Thermal Recovery (Monograph, Volume 7) If searched for the book Thermal Recovery (Monograph, Volume 7) by Michael Prats in pdf form, then you have. AAPG Datapages/Archives. Thermal Recovery Monograph, by Michael Prats. Thermal Recovery (Monograph, Volume 7) By Michael Prats If searched for a ebook Thermal. Autocertificazione Stato Di Famiglia Storico Modello Pdf To Excel on this page.

The most common method used to enhance oil production over primary rates is water injection, commonly referred to as secondary oil recovery. Common practice in the industry is to refer to all other methods as tertiary enhanced oil recovery.

According to Prats, thermal enhanced oil recovery (TEOR) is a family of tertiary processes defined as 'any process in which heat is introduced intentionally into a subsurface accumulation of organic compounds for the purpose of recovering fuels through wells.' This article provides an introduction to the mechanisms by which steam can enhance oil recovery.

Contents • • • • • • • • • • • • Steam The most common vehicle used to inject heat is saturated steam. Hot water and heated gasses have been tried, but none are as effective as quality steam. According to a 2000 Oil & Gas Journal survey, steam enhanced oil recovery (EOR) projects accounted for 417,675 barrels of oil per day (BOPD), or 56% of the total for all tertiary enhanced recovery methods.

That production rate has been essentially flat for more than 15 years. Hydrocarbon gas injection and CO 2 gas injection are the only other significant contributors and amount to only 17 and 24%, respectively. Properties of saturated steam Like other substances, water can exist in the form of a solid (ice), as a liquid (water), or as a gas (loosely called steam). Steamflood processes are concerned with the liquid and gas phases, and the change from one phase to the other. The phase change region, in which water coexists as liquid and gas, is where our interest lies when considering steam for use in the oil field.

The term 'steam' is an imprecise designation because it refers to a water liquid/gas system that can exist from 32°F to any higher temperature; from 0.1 psia to any higher pressure; and from nearly all liquid to 100% gas. Steam quality refers to the phase change region of liquid to gas and is defined as...(1) Heat capacity is expressed in units of Btu/(lbm-°F). A 'Btu' is defined as the amount of heat required to raise 1 lbm of water from 60 to 61°F. All liquids and solids are compared to pure water, which has the highest heat capacity of any substance at 1 Btu/(lbm-°F). By calculating a ratio of the heat capacity of water divided by that of another substance, a convenient fraction called 'specific heat' is obtained. Notice that petroleum has a specific heat of 0.5, or half that of water, and sandstone is only 20% of water on a per pound basis.

No other liquid or gas carries as much heat per pound as water. Also, the temperature range at which this high heat carrying performance is achieved, 34 to 700°F, is ideal for many processes, including steamflooding. Enthalpy is a useful property defined by an arbitrary combination of other properties and is not a true form of energy. The absolute value of enthalpy is of no practical value. Changes in enthalpy are extremely useful, however, and are the basis for steamflood energy calculations. The total enthalpy held by each pound of liquid water at any temperature is called sensible heat, h f. The heat input, which produces a change of state from liquid to gas without a change of temperature, is called the 'latent heat of evaporation' and is shown by h fv.

The total heat, h v, in each pound of 100% quality or saturated steam is the sum of these two, h v = h f + h fv. In the phase change or 'saturation' region, steam can only exist at one temperature for a given pressure regardless of quality or latent heat content, as shown in Fig. Steam increases in volume as latent heat increases, as in Fig. This is a useful property in displacing oil in a steamflood process.

The volume occupied by 1 lbm of steam at any pressure is its specific volume in ft 3/lbm and is represented by υ s. Values for these thermal properties of water are published widely.