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A study on the effect of high salinity formation water on CO 2 experimental method

A technology with high salinity and experimental methods, applied in the field of core displacement, can solve problems such as lack of corrosion resistance and oleophobicity, difficulty in quantitative data collection, etc., to achieve the effect of avoiding corrosion, preventing corrosion and prolonging service life

Active Publication Date: 2019-09-17
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The designed fluid volume measurement device has a simple structure, and only needs to add four valves, two conduits, two pressure measuring instruments, a collection container, a buffer container and a semi-permeable The separator is sufficient, but the corrosion resistance and oleophobicity of the device are lacking, and this method is difficult to achieve CO 2 Quantitative data acquisition of sedimentation generated by interaction with formation water

Method used

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  • A study on the effect of high salinity formation water on CO <sub>2</sub> experimental method

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Effect test

Embodiment 1

[0033] Such as Figure 1-9 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental method of flooding effect, the steps are as follows:

[0034] 1) Take the core, cut the core slices A and B respectively at the core injection end and the exit end, wash the core, dry and weigh it, measure the pore volume of the core, gas permeability, deionized water saturation core, and measure nuclear magnetic resonance. Put it into the core holder for displacement, and measure the permeability of the core water;

[0035] 2) Use crude oil to replace deionized water saturated crude oil, keep the temperature and pressure, and carry out CO 2 Water gas injection, core washing, drying, measuring mass, pore volume, gas permeability, vacuuming, deionized water saturated core, deionized water displacement, measuring core water permeability, measuring nuclear magnetic resonance;

[0036] 3) Cut the core slices C and D at the core injection end and the exit end resp...

Embodiment 2

[0045] Such as Figure 1-9 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental method of flooding effect, the steps are as follows:

[0046] 1) Take the rock core, cut the rock core slices A and B respectively at the core injection end and the outlet end, the thickness is preferably 2mm, wash the rock core, dry and weigh, measure the pore volume of the rock core, the permeability of the gas test, saturate the rock core with deionized water, measure Nuclear magnetic resonance, put the core into the core holder for displacement, measure the water permeability of the core;

[0047] 2) Use de-asphaltened crude oil to displace deionized water-saturated crude oil, keep the temperature and preferably pressure for 24 hours, and carry out CO 2 Water gas injection, first inject 5PV of CO 2 Then inject 5PV deionized water for a total of 3 cycles of injection, washing the core, drying, measuring mass, pore volume, gas permeability, vacuuming, deion...

Embodiment 3

[0055] Such as Figure 1-9 As shown, a study on the effect of high-salinity formation water on CO 2 Experimental method of flooding effect:

[0056] Core processing: for observation of CO 2 The change of rock surface morphology and rock minerals before and after displacement, under the current technical conditions, special treatment has been carried out. Before the reaction, core slices with a thickness of preferably 2mm are cut at the injection end of the core and the outlet end of the core respectively. A and B, as analytical samples. CO 2 After the flooding, core slices C and D with a thickness of preferably 2mm are cut at the injection end of the core and the outlet end of the core respectively, so as to avoid the inhomogeneity of the core as much as possible.

[0057] In order to separately study the CO 2 -water-rock interaction, CO 2 - Influence of formation water precipitation on reservoir physical properties and development parameters, as shown in Table 1, by des...

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Abstract

The invention provides an experiment method for researching influence on CO2 flooding by highly-mineralized formation water. The experiment method includes the following steps that a slabbed core A and a slabbed core B are cut from the two ends of a rock core, the rock core is washed, dried and weighed, the rock core pore volume and the gas logging permeability are measured, the rock core is saturated, magnetic resonance imaging is detected, and flooding is carried out to obtain rock core water logging permeability; flooding is carried out, temperature and pressure are kept for placement, CO2 water and gas injection is conducted, the rock core is washed and dried, the mass, the pore volume and the gas logging permeability are measured, vacuumizing is carried out, the rock core is saturated, flooding is carried out to measure the rock core water logging permeability, and magnetic resonance imaging is conducted; a slabbed core C and a slabbed core D are cut from the two ends of the rock core, washed and dried, electron microscope scanning, surface element and rock mineral analysis are carried out on the slabbed core A, the slabbed core B, the slabbed core C and the slabbed core D, the steps 1-3 are repeated after replacing the rock core and changing the temperature and the pressure; data is collected. The influence on reservoir physical property and development parameter collection by CO2-water-rock interaction and CO2-formation water precipitation can be researched.

Description

technical field [0001] The invention belongs to the technical field of core displacement, and in particular relates to a method for studying the effect of high-salinity formation water on CO 2 The experimental method of flooding effect. Background technique [0002] With the continuous development of oil and gas field development, the crude oil reserves of high-quality reservoirs are becoming less and less, and the new reserves currently explored are mainly low-permeability reservoirs, and most of them are ultra-low-permeability reservoirs and ultra-low-permeability reservoirs. For ultra-low permeability reservoirs and specific permeability reservoirs, conventional water injection development has the problem of "no injection, no production". carbon dioxide (CO 2 ) has the advantages of good fluidity in the formation, can greatly expand the volume of crude oil, greatly reduce the viscosity of crude oil, reduce the interfacial tension of oil and gas, and have miscibility wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16
Inventor 赵东锋殷丹丹竺柏康朱根民高良军王北福
Owner ZHEJIANG OCEAN UNIV
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