Fluid recovery

A. R. Jennings, Jr. Method of enhancing stimulation load fluid recovery. Patent US 5411093,1995. 

R. W. Bartett, Solution Mining Leaching and Fluid Recovery of Materials, Gordon and Breach, Philadelphia, 1992. 

In this study, C16-C32 wax distillate is separated into n-paraffin and denormal oil fractions by vapor phase contacting with type 5A molecular sieves. 2,2,4-Trimethylpentane (isooctane), 2,2-dimethylbutane, and 2-methylpentane are each used as the supercritical fluid. Recovery of n-paraffins from the molecular sieves is accomplished by contacting with nitrogen or ammonia gas. 

The direct viscosity enhancement of CO2 would also improve its performance as a fracturing fluid in low permeability formations. A more viscous fluid would be able to transport the proppant particles into the fracture more effectively. These proppants hold the high permeability fracture open, increasing the rate of fluid recovery from the well. 

The solubility of COz in crude oil or formation water has a distinct advantage in fracturing operations. C02 is stored until fluid recovery begins, and as the pressure decreases, gaseous C02 breaks out of solution and expands to push fluids to the surface. These properties allow C02 to remain in the formation for several hours prior to flowing the well back. However, if the carbonated foamed fluid is left in formation for an extended period of time, then the C02 will dissipate. 

Vapor and liquid phases coexist in virtually all areas of petroleum production operations, including reservoirs, wellbores, surface-production units, and gas-processing plants. Knowledge of fluid properties and phase behavior is required to calculate the fluid in place, fluid recovery by primary depletion, and fluid recovery by enhanced oil recovery techniques such as gas cycling, hydrocarbon solvent injection, and C02 displacement. Because of the complex nature of petroleum reservoir fluids and the often complicated phase behavior observed at elevated temperature and pressure conditions, the fluid properties and phase behavior historically have been measured experimentally. The complex nature of the fluids arises because of the supercritical components which are dissolved in the mixture of paraffinic, naphthenic, and... 

William C., Lyons BG, Reuben L. et al. Air and gas drilling manual Applications for oil and gas recovery wells and geothermal fluids recovery wells. 3rd Ed. Gulf Professional Publishing 2009. 

Reservoir Fluid Recovery Sadlerochit Formation, Prudhoe Bay Field", January (1976). 

Figure 5. Effect of Surfactant Concentration on Breakthrough Time (BT) and Fluid Recovery (FR) from Sandpacks in the Presence of Suntech IV Foam.

Figure 8. Effect of Temperature on Fluid Recovery from Sandpacks for SDS and Suntech IV Foam Systems.

These results also indicate that high foam stability is not reguired for reducing gas mobility or for higher fluid recovery. 

TABLE VII. EFFECT OF EE ESSURE WOPS BE EAKTHROCXai TIME AND FLUID RECOVERY FROM SANDPACKS WTIH AND WnHOOT FOAMING AGENTS... 

Fig. 2 Supercritical fluid recoveries of polycyclic aromatic hydrocarbons as a function of density and temperature.

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