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| Number | Title | Issue Date |
| 7987907 | Hydrocarbon recovery process Method for increasing the recovery of crude oil from a reservoir containing at least one porous and permeable subterranean formation wherein the formation includes sandstone rock and at least one mineral that has a negative zeta potential under the reservoir conditi... | 08/02/2011 |
| 7426960 | Biogenic fuel gas generation in geologic hydrocarbon deposits A method to stimulate the biogenic production of a metabolite with enhanced hydrogen content that includes forming an opening in a geologic formation to provide access to a consortium of microorganisms, and injecting water into the opening to disperse at least a por... | 09/23/2008 |
| 7324929 | Method and system for simulating a hydrocarbon-bearing formation The invention is a method for simulating one or more characteristics of a multi-component, hydrocarbon-bearing formation into which a displacement fluid having at least one component is injected to displace formation hydrocarbons. The first step of the method is to ... | 01/29/2008 |
| 7303009 | Method to detect low salinity injection water encroachment into oil formations This invention relates to the field of water flood monitoring in low saline water environment in a subterranean formation. In particular, the method of the invention relates to detecting the encroachment of low salinity water into oil formations. This invention prov... | 12/04/2007 |
| 7107238 | Method and apparatus for providing relative-evaluations of commodities to user by using commodity-comparison map In a method for providing information on commodities to a user by using a computer, commodity-comparison information indicating at least one result of at least one comparison between the commodities is acquired and stored. Next, a commodity-comparison map which visu... | 09/12/2006 |
| 7006959 | Method and system for simulating a hydrocarbon-bearing formation The invention is a method for simulating one or more characteristics of a multi-component, hydrocarbon-bearing formation into which a displacement fluid having at least one component is injected to displace formation hydrocarbons. The first step of the method is to ... | 02/28/2006 |
| 6913080 | Re-use recovered treating fluid This invention is directed to treating fluid production and subterranean formation treating methods as well as compositions for treating fluids that reuse at least part of a prior treating fluid, particularly a fluid having one or more constituents that can be relin... | 07/05/2005 |
| 6886632 | Estimating formation properties in inter-well regions by monitoring saturation and salinity front arrivals A method and system of monitoring the movement of at least one front in an inter-well region is comprised of: providing a first well representing the origination of at least one front (such as a saturation front or a salinity front); providing one or more monitoring... | 05/03/2005 |
| 5543387 | Surfactant additive for oilfield acidizing Subterranean oil-bearing formations are treated with aqueous acid solutions which include an effective amount of an alkoxylated alkyl substituted phenol sulfonate which exhibits both antisludge and demulsification properties.... | 08/06/1996 |
| 5520483 | Method and system for remediation of groundwater contamination A method for remediating a hydrocarbon-contaminated region of a subterranean body of groundwater to destroy or reduce the initial concentration levels of hydrocarbon contaminants. A plurality of mutually spaced wells are provided which intersect the groun... | 05/28/1996 |
| 5314017 | Method of assisting the recovery of petroleum in vertically fractured formations utilizing carbon dioxide gas to establish gravity drainage The invention relates to assisting the recovery of petroleum from vertically fractured formations utilizing carbon dioxide gas to lower the interfacial tension between the gas and the petroleum in the vertical fractures and in the formation matrix adjacen... | 05/24/1994 |
| 5036915 | Method of reducing the reactivity of steam and condensate mixtures in enhanced oil recovery This invention relates generally to a method for reducing the reactivity of steam or mixtures of steam and condensate in enhanced oil recovery. More particularly, the method of the invention comprises pH control through the injection or addition of either... | 08/06/1991 |
| 4915169 | Method for controlling the pH of steam fluids using heterocyclic, multifunctional, nitrogen-containing compounds The present invention relates to an improved method for controlling pH in the liquid and vapor phases of wet steam having such phases formed in a steam generation system from feedwater having therein at least one carbonate species which in the presence of... | 04/10/1990 |
| 4871023 | Method for controlling the pH of steam fluids A method for controlling pH in the liquid and vapor phases of wet steam having such phases formed in a steam generator system from feedwater having therein at least one carbonate species which in the presence of steam forms a vapor phase component tending... | 10/03/1989 |
| 4733725 | Single well test for evaluating CO2 injection A test is provided for evaluating and/or designing an enhanced oil recovery process including CO2 injection. A modified log-inject-log technique is utilized to determine residual CO2 saturation and incremental hydrocarbon displacemen... | 03/29/1988 |
| 4719972 | Treatment of steam feedwater with CO2 to reduce oil well reservoir gravel and sand dissolution during steam injection A method of inhibiting the dissolution of the gravel pack and/or the erosion of silicate-containing formations subjected to steam-enhanced oil recovery processes. The method includes the addition of CO2 into the residual liquid phase of the ste... | 01/19/1988 |
| 4714112 | Method for controlling rock dissolution and pipe corrosion during oil well steam injection A method of inhibiting the dissolution of the gravel pack and silicate- or carbonate-containing formations subjected to steam-enhanced oil recovery processes while inhibiting the corrosion of mild steel. The method includes the controlled addition of a sa... | 12/22/1987 |
| 4687057 | Determining steam distribution An enhanced oil recovery method utilizes a monitored salinity concentration decline in produced water at the various producing wells of a steam flood project to determine actual steam distribution. This actual steam distribution is utilized to determine a... | 08/18/1987 |
| 4473116 | Method of determining sodium chloride equivalency for improved oil recovery processes using surfactant compositions The sodium chloride equivalency of brine from a subterranean oil bearing reservoir is determined by equilibrating said brine with a known surfactant system and a standard hydrocarbon to give a multiphase system which is compared with known phase volume di... | 09/25/1984 |
| 4265308 | Oil recovery method using unique salinity for oil recovery surfactant system A series of surfactant systems is prepared at varying electrolyte concentrations, each system being mixed with oil to be displaced or its equivalent and allowed to equilibrate to determine the salinity at which the microemulsion phase has approximately eq... | 05/05/1981 |
| 4258789 | Cosurfactant blends for oil recovery surfactant system A first and second series of aqueous surfactant-cosurfactant-electrolyte systems are prepared at varying electrolyte concentrations using, respectively, a relatively water insoluble cosurfactant and a relatively water soluble cosurfactant. The resulting s... | 03/31/1981 |
| 4250961 | Oil recovery method utilizing a surfactant slug driven by water of a controlled salinity The efficiency of a low tension surfactant flooding program is improved by first determining the upper and lower boundaries for the range of injected water salinities, that, when intermingled with the injected aqueous surfactant slug will enable the surfa... | 02/17/1981 |
| 4122895 | Correlation of weighted effect of different ions and surfactant composition for surfactant flood In the recovery of oil from a formation with an aqueous surfactant solution containing an anionic surfactant such as a petroleum sulfonate, a cosurfactant such as tertiary butyl alcohol, and an electrolyte, a specific surfactant system which is suitable f... | 10/31/1978 |
| 4066124 | Salinity tolerant surfactant oil recovery process Primary anionic surfactants such as organic sulfonates are effective for recovering oil from subterranean formations only if the salinity and/or hardness of the formation water is relatively low. In petroleum formations containing high salinity, or hard w... | 01/03/1978 |
