ARCHIVED REPORTS UIC PERMIT APP - Laserfiche WebLink

Home Browse Search

ATTACHMENT I:FORMATION TESTING PROGRAM shutting in the well, it drops back to about 1,764 psi. The injection zone has been pressurized by injection at STIG-1 but only a minimal amount. As with other injection zone parameters necessary to complete the UIC permitting process, actual reservoir pressures will be determined on LEC-1 as it is completed. 4. Storage Coefficient—The storage coefficient for the Domengine was calculated using the porosity determined form the geophysical logs on the STIG-1 well and the completion interval thickness, and an assumed value of 7.5 x 10-6 psi-1 for compressibility of the formation water (a literature average value). The product of these values is defined as the storage coefficient, and was calculated to be about 6 x 10-4 feet psi-1. 5. Oil/Water Saturation—The Domengine Formation is 100 percent water saturated in this area. Injectivity Testing and Geophysical Logging Injectivity tests will be performed in the LEC-1 well upon completion of construction. A step-rate test will be conducted following successful completion of the pre-injection temperature log.Water filtered and treated for injection into the STIG-1 well will be used for the LEC-1 injectivity test since that will most closely match the chemical characteristics of the proposed waste stream for the LEC-1 well. All temperature logs will be run at a rate of no more than 100 feet per minute (fpm). Pressure in the wellbore and at the wellhead will be recorded continuously throughout the step-rate tests. Flow rate will be continuously recorded at the wellhead during the test. Injection will begin after a pressure monitoring tool is placed in the well at a depth of about 4,000 feet. The flow rate will be increased until the planned 225 gpm injection rate for the well is achieved. The 225 gpm injection rate will be maintained for a minimum of 3 hours, then a spinner log and a temperature log (run at 80 fpm) will be conducted from the bottom of the 7-inch casing shoe at about 3,660 feet to total depth. Upon completion of the spinner and temperature logging at the 225 gpm step,injection will be reduced to 150 gpm and the spinner log repeated twice more over the same depth interval. Upon completion of the logging at the 150 gpm step,flow will be further reduced to 100 gpm, and the spinner log and temperature log will be repeated over the same depth interval. The pressure logging tool will be placed near the bottom of the well, and injection will continue for 30 minutes, then the pump will be turned off and the well shut in. The pressure fall-off will be recorded until it stabilizes within 3 psi of the pressure in the wellbore recorded immediately prior to initiation of the test. Direction and Rate of Groundwater Movement in Deep Marine Sandstones The direction of movement of formation waters within the deep marine sandstones of this region,including within the Domengine Formation,is probably strongly influenced by the structural features. Structural dip is to the southwest, and the areas of potential recharge are located at higher elevations positioned to the northeast toward the Sierra foothills. 1-6 SAC/371322/082550025(ATTACHMENT-I.DOC)