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Simulation and evaluation system for low-salinity water injection experiment and method

A technology of experimental simulation and evaluation system, applied in the direction of material inspection products, soil material testing, etc., can solve problems such as weak persuasion, incompleteness, difficulty, etc., and achieve the effect of improving accuracy and comprehensiveness

Inactive Publication Date: 2016-06-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing evaluation experiments are not comprehensive and systematic, and judgments are given only by measuring some parameters (such as sand production, pH value, wettability, Zeta potential). The low-salinity water injection development plan has no exact theoretical basis and is full of difficulties

Method used

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  • Simulation and evaluation system for low-salinity water injection experiment and method
  • Simulation and evaluation system for low-salinity water injection experiment and method
  • Simulation and evaluation system for low-salinity water injection experiment and method

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Embodiment 1

[0051] This embodiment is an illustration of the simulated low-salinity water injection process and evaluation method. figure 1 The steps that described method comprises are shown, and table 1 has shown the relation of various mechanisms of described method research and test object and test time:

[0052] (1) Preparation of water and crude oil: Prepare water with different salinities according to the actual raw water salinity and ion composition, respectively, raw water, salinity is 0.5 times, 0.2 times, 0.1 times, 0.05 times, 0.02 times of raw water times and 0.01 times the low salinity water; take back the crude oil from the site, and remove the solid impurities in it.

[0053] (2) Making and screening cores: After the rock samples were transported back from the site, several cores were drilled; the porosity, permeability, oil-water saturation, and pore throat physical properties of each core were tested and analyzed, and the physical properties of the pore throats were eval...

Embodiment 2

[0062] This embodiment is a description of the process and evaluation method of simulating the combination of low-salinity water injection and other three mining methods. figure 1 The steps that described method comprises are shown, and table 1 has shown the relation of various mechanisms of described method research and test object and test time:

[0063] (1) Preparation of water and crude oil: Prepare water with different salinities according to the actual raw water salinity and ion composition, respectively, raw water, salinity is 0.5 times, 0.2 times, 0.1 times, 0.05 times, 0.02 times of raw water times and 0.01 times the low salinity water; take back the crude oil from the site, and remove the solid impurities in it.

[0064] (2) Preparation of displacing solution: add three medicines to water to prepare a displacement solution with the same concentration of three medicines.

[0065] (3) Making and screening rock cores: After transporting the rock samples back from the s...

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Abstract

The invention discloses a simulation and evaluation system for a low-salinity water injection experiment and method. The method comprises the following steps: (1) preparing displacement liquids in different salinities, performing a displacement experiment by using a specific serial core holding unit, determining the natures of effluent from each core corresponding to the displacement liquids in different salinities at different moments in real time, and determining a yield-increasing effect of each displacement liquid; (2) evaluating the change conditions of the clay transferring, wettability reversal, double electrode layer diffusion, ion exchange, mineral dissolution and pH value before and after the water flooding, and supplying basis to the evaluation for a yield-increasing mechanism; and (3) combining low-salinity water injection with other tertiary oil recovery methods for evaluating the yield-increasing effect and the yield-increasing mechanism. The method disclosed by the invention has the beneficial effects that (1) the reaction between three phases of oil, water and rock in the displacement experiment can be evaluated in real time; (2) the yield-increasing effect of the combination of low-salinity water injection with other tertiary oil recovery methods can be evaluated, and the joint yield-increasing mechanism can be evaluated; (3) and the theoretical basis can be supplied to the injection liquid preparation scheme in practical operation.

Description

technical field [0001] The invention belongs to the technical field of laboratory experiments for oil and gas field development; in particular, it relates to a low-salinity water injection experiment simulation and evaluation system and method. Background technique [0002] Water injection is a simple, reliable, mature and highly economical oil and gas field development technology widely used all over the world. It is an important measure to ensure long-term high and stable production in oil fields, and it is also the main secondary recovery method for oil fields to enhance oil recovery. . At present, onshore oilfields mainly use formation produced water for water injection, while offshore oilfields mainly use seawater, so most of the injected water has a high salinity. In addition to considering the compatibility of injected water and formation water and meeting the requirements of water injection system anticorrosion and formation anti-clogging, the general water injectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 李海涛李颖阳明君朱世琰李亚辉夏涛张建丰
Owner SOUTHWEST PETROLEUM UNIV
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