POST COLD HEAVY OIL PRODUCTION WITH SAND MICROBIAL ENHANCED OIL RECOVERY METHOD

摘要

A post cold heavy oil production with sand ("CHOPS") microbial enhanced oilrecovery ("MEOR") method comprises selecting a well in communication with areservoir having at least one wormhole and that is being subjected to or hascompleted primary CHOPS production and determining whether the reservoircontains a sufficient amount of a gas-producing indigenous microbe to re-pressurizea drainage portion of the well to a target pressure or to generate atarget amount of gas. When the reservoir does not contain a sufficient amountofthe indigenous microbe, then an injectant is prepared comprising a sufficientamount of a gas-producing microbe to re-pressurize the drainage portion of thewell to the target pressure or to generate the target amount of gas, anutrientsuitable for the microbe, and a fluid base. When the reservoir does contain asufficient amount of the gas producing indigenous microbe, then an injectantisprepared comprising a suitable nutrient for the indigenous microbe and thefluidbase. Then, the injectant is injected through the well and into the at leastonewormhole in the reservoir; the well is shut in until the pressure in the wellreachesthe target pressure or the target amount of gas is generated; and then thewell isproduced.