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Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity

Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity, long term injectivity, filter ratio, or any combination thereof of the injection fluid.

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1. A portable apparatus for analyzing an injection fluid, the apparatus comprising a housing encompassing one or more components of the portable apparatus, wherein the components of the portable apparatus comprise: an inlet to receive the injection fluid;a pre-filter coupled to the inlet;three analy

1. A portable apparatus for analyzing an injection fluid, the apparatus comprising a housing encompassing one or more components of the portable apparatus, wherein the components of the portable apparatus comprise: an inlet to receive the injection fluid;a pre-filter coupled to the inlet;three analytical modules, wherein the three analytical modules comprise a surrogate core, a capillary viscometer, and a filter;a pump coupled to the pre-filter to direct the injection fluid from the pre-filter through the three analytical modules;one or more pressure transducers, wherein the one or more pressure transducers comprise a pressure transducer coupled to the pre-filter to measure a differential pressure of the injection fluid across the pre-filter, a pressure transducer coupled to the surrogate core to measure a differential pressure of the injection fluid across the surrogate core, a pressure transducer coupled to the capillary viscometer to measure a differential pressure of the injection fluid across the capillary viscometer, and a pressure transducer coupled to the filter to measure an absolute pressure of the injection fluid to be filtered through the filter;a data acquisition system (DAS) that receives data from the one or more pressure transducers and calculates a property of the injection fluid from the data; anda power supply coupled to the pump, the one or more pressure transducers, and the data acquisition system to provide power. 2. The apparatus of claim 1, wherein the one or more pressure transducers comprise a display providing a pressure reading. 3. The apparatus of claim 1, wherein one or more of the three analytical modules are each releasably connected to the portable apparatus. 4. The apparatus of claim 3, wherein one or more of the three analytical modules are each individually enclosed within the housing. 5. The apparatus of claim 1, wherein the pre-filter comprises a sand pack. 6. The apparatus of claim 1, wherein the DAS is coupled to an external computing system that receives data from the DAS and controls the pump. 7. The apparatus of claim 1, wherein the property of the injection fluid calculated from the data is chosen from an injectivity of the injection fluid for a minimum of 20 pore volumes and a maximum of 1,000 pore volumes, a viscosity of the injection fluid, a filter ratio of the injection fluid, or any combination thereof. 8. The apparatus of claim 7, wherein the filter ratio is 1.5 or less with a minimum of 1.0. 9. The apparatus of claim 1, further comprising a pressure vessel coupled to the pre-filter to receive and store injection fluid from the pre-filter and coupled to one or more of the three analytical modules to deliver the injection fluid from the pressure vessel to one or more of the three analytical modules, and wherein the pump is coupled to the pressure vessel to pump the injection fluid through the pressure vessel. 10. The apparatus of claim 1, wherein the components of the portable apparatus further comprise one or more additional analytical modules chosen from a temperature probe, a pH probe, a conductivity probe, an oxidation reduction potential probe, or any combination thereof. 11. The apparatus of claim 1, wherein the filter comprises a 1.2 micron filter having a diameter of 47 mm or 90 mm. 12. The apparatus of claim 1, wherein the components of the portable apparatus together form a path for fluid flow from the inlet to the one or more of the three analytical modules. 13. The apparatus of claim 1, wherein the portable apparatus of claim 1 is positioned for use on a tabletop. 14. A method for analyzing an injection fluid, the method comprising: (a) providing a subsurface reservoir containing hydrocarbons there within;(b) providing a wellbore in fluid communication with the subsurface reservoir;(c) mixing an injection fluid and flowing the injection fluid through a fluid conduit to the wellbore;(d) measuring a property of the injection fluid flowing through the fluid conduit using the portable apparatus of claim 1 having the three analytical modules that comprise the surrogate core, the capillary viscometer, and the filter, wherein the inlet of the portable apparatus is fluidly connected to the fluid conduit, thereby forming a path for fluid flow from the conduit to one or more of the three analytical modules in the portable apparatus; and(e) injecting the injection fluid through the wellbore into the subsurface reservoir. 15. The method of claim 14, wherein the method further comprises: (f) comparing the property of the injection fluid measured in step (d) with a target value or range; and(g) altering the mixing of the injection fluid in step (c) to improve correlation between the property of the injection fluid measured in step (d) and the target value or range. 16. The method of claim 15, wherein step (d) comprises measuring a filter ratio of the injection fluid flowing through the fluid conduit using the portable apparatus of claim 1, wherein the filter comprises a 1.2 micron filter having a diameter of 47 mm or 90 mm; wherein step (f) comprises comparing the filter ratio of the injection fluid measured in step (d) with the target value or range of 1.5 or less with a minimum of 1.0, andwherein step (g) comprises altering the mixing of the injection fluid in step (c) to reduce the filter ratio of the injection fluid to a value of 1.5 or less with a minimum of 1.0. 17. The method of claim 16, wherein altering the mixing of the injection fluid in step (f) comprises changing feedstock mixed to form the injection fluid, varying ratios of feedstock mixed to form the injection fluid, changing a mixer used to mix the injection fluid, or a combination thereof. 18. The method of claim 16, wherein steps (d), (f), and optionally (g) are performed continuously. 19. The method of claim 14, wherein the injection fluid is analyzed for an enhanced oil recovery (EOR) operation chosen from a polymer flooding operation, an alkaline-polymer (AP) flooding operation, a surfactant-polymer (SP) flooding operation, an alkaline-surfactant-polymer (ASP) flooding operation, a conformance control operation, a hydraulic fracturing operation, or any combination thereof. 20. The method of claim 14, further comprises (h) recovering the hydrocarbons via a production wellbore in fluid communication with the subsurface reservoir.