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Method of stress sensitivity experiment using artificial fractured carbonate cores

A stress-sensitive, carbonate rock technology, used in the preparation of test samples, measurement devices, suspensions and porous material analysis, etc., can solve the problem that the core hardness cannot meet the stress-sensitive test, etc., to meet the requirements of repeated use. , the effect of strong hardness

Active Publication Date: 2018-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, for carbonate reservoirs with relatively simple pore structure, the manufacturing process is relatively mature, but especially for fractured carbonate reservoir cores, there is no mature manufacturing method at present. The hardness of the rock core produced by some methods cannot meet the requirements of the stress sensitive experiment

Method used

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  • Method of stress sensitivity experiment using artificial fractured carbonate cores
  • Method of stress sensitivity experiment using artificial fractured carbonate cores
  • Method of stress sensitivity experiment using artificial fractured carbonate cores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The titration method is used to measure the carbonate rock in the natural core to be 88%, and the carbonate rock in the carbonate rock powder to be 92%. The mixture of carbonate rock powder and quartz sand is prepared, and the ratio of the two is 24:1. Among them, the carbonate rock powder and the quartz sand mesh number are both 300.

[0059] Prepare the dosage of the cement in proportion, and the dosage of medicines required for every 100g of the mixture is: 10g of epoxy resin, 2.1ml of dibutyl phthalate, 0.85ml of ethylenediamine, and 4.05ml of acetone. Fully mix the well-proportioned minerals and cement, let it dry at room temperature for 2 hours, pour it into an artificial core mold, and press it under an axial pressure of 50 MPa for 48 hours. The core was taken out of the mold and dried in a thermostat at 90°C for 12 hours.

[0060] According to the above steps, 6 matrix cores were made, and 4 of them were pressed image 3 The device shown performs fracture crea...

Embodiment 2

[0065] Prepare a mixture of carbonate rock powder and quartz sand at a ratio of 24:1. Among them, the carbonate rock powder and the quartz sand mesh number are both 300. Prepare the amount of cement in proportion, and the amount of medicine required for every 100g of the mixture is: 10g of epoxy resin, 2.1ml of dibutyl phthalate, 0.85ml of ethylenediamine, and 4.05ml of acetone; The mixture was thoroughly mixed, left to air at room temperature for 2 hours, poured into an artificial core mold, and pressed under an axial pressure of 50 MPa for 48 hours. The core was taken out from the mold and dried in a constant temperature oven at 90°C for 12 hours.

[0066] Put the matrix core into the stress-sensitivity experiment device, and record the permeability values ​​sequentially under confining pressures of 3MPa, 10MPa, 20MPa, 30MPa, and 40MPa; after the experiment is completed, take out the core and put it in image 3 Seam making device shown. After the fractures penetrating the...

Embodiment 3

[0074] In order to verify the simulation effect of the artificial core on the natural core, the stress-sensitivity test data of the unfilled fracture core constructed by the present invention and the natural unfilled fracture core are compared. Natural core data references: Experimental study on stress sensitivity of carbonate rock cores [J], Natural Gas Industry, 2002, 22 (Supplement): 114-117. Depend on Figure 7 It can be seen that the artificial unfilled fractured core is consistent with the stress sensitivity change law of the natural unfilled fractured core.

[0075] For unfilled cores, due to the strong stress sensitivity of the fracture permeability, when the effective stress is small, the fracture permeability decreases sharply, which mainly reflects the stress sensitivity of the fracture. As the effective confining pressure increases and the fractures close, the stress sensitivity of the permeability of the matrix gradually appears. Figure 8 and Figure 9 Schemat...

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Abstract

The invention discloses a method for carrying out a stress-sensitivity experiment using an artificially fractured carbonate rock core, which comprises the following steps: measuring the mineral content of natural carbonate rock, and performing proportioning to obtain a mineral mixture; preparing the amount of cement, And mixed with mineral mixture to make artificial matrix core, measure the stress sensitivity characteristics of matrix core; create fractures on artificial matrix core to obtain fracture core; measure the stress sensitivity characteristics of fracture core in non-filling mode; use coarse quartz sand cement to crack Core filling to simulate half-filled fractured cores and measure stress-sensitivity characteristics of half-filled cores; filling fractured cores with calcium carbonate cement to simulate fully-filled fractured cores and measure stress-sensitivity characteristics of fully-filled cores . This method can better meet the requirements of stress-sensitive experiments.

Description

technical field [0001] The invention relates to the technical field of mechanical testing experiments, in particular to a method for carrying out stress-sensitivity experiments using man-made fractured carbonate rock cores. Background technique [0002] Fractured carbonate reservoir is an important type of carbonate reservoir. Due to the coexistence of fractures and pores, complex lithology and strong heterogeneity, the types of oil and gas storage spaces and physical characteristics of seepage are very complex. Reservoir stress sensitivity is a common phenomenon in the development of fractured carbonate reservoirs. In the study of reservoir stress sensitivity, the production process of oil and gas reservoirs can be regarded as a dynamic coupling process of multiphase fluid seepage and elastic-plastic deformation of porous media. In the process of oil and gas reservoir exploitation, multiphase fluid seepage and porous medium deformation interact and restrict each other, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N15/08
Inventor 廉培庆李琳琳陈志海陈立莹马安来张俊法杜秀娟
Owner CHINA PETROLEUM & CHEM CORP
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