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A microscopic model of carbonate reservoir and its preparation method and application

A technology of carbonate reservoirs and microscopic models, applied in teaching models, educational tools, instruments, etc., can solve problems affecting the contact angle between water and calcium carbonate surface, affecting experimental results, etc., and achieves simple, fast and fast preparation methods Accelerated, strong pressure-bearing effect

Active Publication Date: 2022-03-18
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of water injection development, it will affect the contact angle between water and calcium carbonate surface, thus affecting the experimental results

Method used

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  • A microscopic model of carbonate reservoir and its preparation method and application
  • A microscopic model of carbonate reservoir and its preparation method and application
  • A microscopic model of carbonate reservoir and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The present embodiment provides a method for preparing a carbonate reservoir microscopic model, which includes the following steps:

[0056] 1. Calcite crystal cutting:

[0057] (1) Crystal slicing: Cut the calcite crystal into crystal slices with a thickness of 3-4 mm using a thin saw or a precision wire cutter.

[0058] (2) Grinding of crystal slices: Use digitally controlled precision machining lathes to grind the crystal slices to ensure that both sides are smooth and flat, in preparation for subsequent uniform etching and bonding.

[0059] (3) Cleaning of crystal slices: Rinse the calcite crystal slices with ethanol and ether respectively, then rinse the surface with deionized water for 3 minutes, and place them in an oven at 105°C for 2 hours to dry after rinsing.

[0060] 2. Preparation of protective coating:

[0061] (1) Production of wax coating: put the crystal sheet into a beaker heated to 160°C filled with molten beeswax and soak for 1 min, then take it ou...

Embodiment 2

[0076] Adopt the method for preparing the microscopic model of carbonate rock reservoir in embodiment 1, design the model pattern channel to be many regular 2.5D hexagonal channels of etching, the inlet and outlet channels on both sides are parallel straight channels, and the length is 100mm. The channel width is 100 μm (such as figure 1 Shown), according to the method of embodiment 1, preparation obtains the microscopic model of carbonate rock reservoir, this model is used in the research of water injection development of carbonate rock, and concrete operation is as follows:

[0077] The Sudan 4 red-dyed kerosene was injected from the inlet and outlet channels on both sides until the model was fully saturated with kerosene, and then the inlet and outlet channels on both sides were simultaneously injected with kerosene and EOR liquid system with enhanced water injection effect at the same pressure and constant pressure. The pressure on both sides is the same, and the pressure ...

Embodiment 3

[0080] Adopt the method for preparing the microscopic model of the carbonate rock reservoir in Example 1, design the channel of the model pattern to be a straight channel, the width of the straight channel is inconsistent, and the intervals of 30 μm and 120 μm are arranged (in order to be consistent with the occurrence of remaining oil in the water injection process, by observing the remaining oil The contact angle between oil and wall surface and water, to judge the effect of enhanced oil recovery liquid system with enhanced water injection effect), prepare and obtain the microscopic model of carbonate rock reservoir according to the method of Example 1, and use this model to judge the effect of enhanced oil recovery liquid system The research on the effect of the enhanced oil recovery liquid system of the water injection effect, the specific operation is as follows:

[0081] Inject Sudan 4 red-dyed kerosene from the injection port of the model until the model is fully saturat...

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Abstract

The invention provides a carbonate rock reservoir microscopic model, a preparation method and application thereof. The model preparation method includes: cutting the calcite crystal into crystal slices; immersing the crystal slices in molten beeswax to form a wax coating on the surface; using a carbon dioxide laser to remove the corresponding surface of the crystal slice according to the mapping shape of the target pattern channel on the front of the crystal slice. Wax coating, to complete the mapping and engraving of the target pattern channel; immerse the crystal piece in hydrochloric acid with the face up and oscillate ultrasonically to etch the channel pattern exposed by the wax coating; drill the etched channel to communicate with the outside world. ; Cover the front of the crystal sheet with a glass cover sheet and an adhesive to bond the crystal sheet, then clean the channel and wet the channel to obtain a microscopic model of the carbonate reservoir. The preparation method of the microscopic model of the carbonate rock reservoir is simple and fast, the model has a strong pressure bearing capacity, and can be used to study the influence of wettability on the effect of water injection development of the carbonate rock to enhance the recovery factor and the like.

Description

technical field [0001] The invention belongs to the technical field of pore-scale fluid flow in the process of oil and gas development, and relates to a carbonate reservoir microscopic model, its preparation method and application. Background technique [0002] At present, more than 99% of the oil and gas reserves discovered in the world are concentrated in sedimentary rocks, and the sedimentary rocks are dominated by carbonate rock and sandstone reservoirs. Among them, the oil and gas reserves in carbonate rock reservoirs account for a huge proportion, oil accounts for more than 60% of the global reserves, and natural gas accounts for more than 40% of the global reserves. However, carbonate oil and gas reservoirs are affected by diagenesis, have strong heterogeneity, poor pore connectivity, and low permeability. activator) to increase the productivity of oil and gas wells. [0003] In the research of water injection development, the surfactant adsorbs on the oil-wet subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B23/40
CPCG09B23/40
Inventor 梁天博周福建苏航于馥玮李源李俊键左洁杨凯曲鸿雁姚二冬李奔胡晓东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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