Method for measuring capillary pressure and wettability of rock core under condition of temperature and pressure of oil deposit
A technology of capillary pressure and temperature pressure, applied in ultra-low permeability or ultra-low permeability core capillary pressure and wettability, measuring low permeability field, can solve the problem of long experiment period, low reliability of phase permeability curve, not static capillary pressure and other problems, to achieve the effect of simple experimental equipment and simple measurement process
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Embodiment 1
[0040] Embodiment 1, single-phase water static capillary pressure test
[0041] For the experimental process of this embodiment, please refer to figure 1 shown.
[0042] The core displacement equipment used in the experiment is AFS300 from American Core Company TM Fully automatic displacement system. The system includes a pressure brake control system and an automatic data acquisition system. The back pressure system and the confining pressure system are controlled by a high-precision multi-stage plunger displacement pump (TELEDYNE ISCO (A Teledyne Technologies Company) 100-DX) in constant pressure mode. The injection displacement system can be set to the constant flow rate or constant pressure displacement mode according to the experimental requirements. The automatic data acquisition system can automatically realize the constant flow rate and constant pressure displacement mode while automatically collecting the pressure of each part of the system, and complete the corre...
Embodiment 2
[0049] Embodiment 2, water drive oil core static capillary pressure and wettability test experiment
[0050] Please refer to figure 1 As shown, the main steps of the experimental process of this embodiment include:
[0051] Take rock samples (core number: 1#) to wash oil, dry, evacuate and fully saturate crude oil;
[0052] Put the saturated core into the core holder, put the core holder into the experimental oven, set the experimental temperature to 60°C, and use crude oil to completely saturate the dead volume of the pipeline at the upstream and downstream ends of the core, and set the back pressure to The formation pressure is 2500psi, and the crude oil is injected at a constant pressure;
[0053] When the pressure difference between the upstream and downstream of the core and the flow rate at the outlet end of the core are stable, close the oil injection valve and open the water phase valve to allow the water phase fluid to flow into the core under the same injection pre...
Embodiment 3
[0059] Example 3. Test experiment of static capillary pressure and wettability of oil driven water core
[0060] see again figure 1 As shown, the main steps of the experimental process of this embodiment include:
[0061] Take the rock sample (core number: 2#), wash it with water, dry it, evacuate it and fully saturate it with water;
[0062] Put the saturated core into the core holder, put the core holder into the experimental oven, set the experimental temperature to 60°C, and completely saturate the dead volume of the upstream and downstream pipelines of the core with water, and set the back pressure to The formation pressure is 2500psi, and water is injected at constant pressure;
[0063] When the pressure difference between the upstream and downstream of the core and the flow rate at the outlet end of the core are stable, close the water injection valve and open the oil phase valve to allow the crude oil fluid to flow into the core under the same injection pressure;
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