E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31, 324/1.2
E21B 47/00 (2006.01) E21B 43/16 (2006.01) E21B 49/00 (2006.01) G01N 27/28 (2006.01)
Patent
CA 1065248
ABSTRACT OF THE DISCLOSURE Fluids are injected into porous strata for many purposes. These include, for example, well stimulation, secondary-type oil recovery, mobility control, regulation of formation "wetness" and regulation of the encroachment of fluids. Fluids used for the above purposes are readily selected using nuclear magnetic resonance (NMR) measurements in the laboratory to measure the interaction between the fluids being injected into the reservoir rock and the in situ fluids or between injected fluids and the porous material. NMR measurements are taken for each component of sample fluids proposed to be injected in the reservoir for a desired purpose, or the sample fluid per se and each of the in situ fluids. NMR measurements are then taken of the interaction between the nuclei of sample fluids injected, the reservoir rock, and the nuclei of fluids in situ. If the injected fluid is to be used for some purposes, for example, well stimulation or secondary-type oil recovery, the fluids are selected which interact least with the rock and with in situ fluids. If the wetness of the reservoir is to be changed, then the fluid is selected which interacts well with the reservoir rock. If a material is to be precipi- tated or formed in situ, the fluid is selected which interacts well with either the reservoir rock or the formation fluids. Additionally, the best combination of components for a particular fluid to be injected can also be determined using NMR, preferably pulsed, detection devices.
266167
Dreher Karl D.
Sydansk Robert D.
Marathon Oil Company
Na
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