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Test method of saturation-resistance increase coefficient of shale with bedding fractures

A technology of resistance increase and test method, which is used in measurement devices, suspension and porous material analysis, material analysis by electromagnetic means, etc. degree relationship and the insignificant decrease of matrix pore saturation

Active Publication Date: 2021-09-07
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decrease in saturation in the matrix pores is not obvious, which makes it difficult for this method to characterize the conductivity of the matrix pore fluid, and also cannot characterize the relationship between the resistance increase coefficient and saturation in the complete shale pore system. Saturation evaluation provides accurate parameters

Method used

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  • Test method of saturation-resistance increase coefficient of shale with bedding fractures
  • Test method of saturation-resistance increase coefficient of shale with bedding fractures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see figure 1 , in this embodiment, the application provides a core 6 holder for shale with bedding fractures, including a kettle body shell 1 and a rubber sleeve 3 arranged in the kettle body shell 1, and a kettle body The plunger 2, the upper plunger 4 of the rock core and the lower plunger 5 of the rock core; the upper end of the kettle body shell 1 is open, and the said kettle body plunger 2 is blocked on the upper end of the kettle body shell 1; the rubber sleeve 3 and the kettle body The shell 1 is arranged separately, and the space between the inner wall of the shell 1 of the kettle body and the outer wall of the rubber sleeve 3 is the inner cavity of the kettle body, and the inner cavity of the kettle body is filled with non-conductive silicone oil; the upper plunger 4 and the The lower core plunger 5 is respectively blocked at the upper and lower ends of the rubber sleeve 3 , and a clamping space for holding the rock core 6 is formed between the upper core plung...

Embodiment 2

[0047] In this embodiment, the application provides a resistivity tester for shale with bedding fractures, including a resistivity meter 11, a computer 12, a core holder 6, a gas source 13 and a weighing balance 14. The rock core 6 holder adopts the above-mentioned rock core 6 holder; the gas source 13 is connected to the upper end of the clamping space through a gas inlet pipeline 15, and the metering balance 14 is connected to the lower end of the clamping space through a gas outlet pipeline 18; The resistivity meter 11 is respectively connected to the lower core plunger 5 and the upper core plunger 4 through the positive electrode lead 17 and the negative electrode lead 16; the output end of the resistivity meter 11 is connected to the input end of the computer 12 .

[0048] Specifically, a plurality of insulating joints are provided on the plunger 2 of the kettle body, and the gas inlet pipeline 15, the gas outlet pipeline 18, the positive electrode wire 17 and the negative...

Embodiment 3

[0051] In this embodiment, the application provides a saturation-resistance increase coefficient test method for shale with bedding fractures, using the above-mentioned resistivity tester, including the following steps:

[0052] S1. Make regular-shaped rock cores and dry them, and measure the dry weight m of the dried rock cores d , length L and diameter d, calculate the total core volume V according to the length L and diameter d d where V d =π*d^2*L / 4.

[0053] Specifically, step S1 includes the following steps:

[0054] S101. Take a shale sample and process it into a plunger core with a diameter d of 2.54 cm and a length L of 3-5 cm.

[0055] S102, drying the plunger core, measuring its dry weight m d , the unit is g, calculate the total volume V of the dried core according to the length L and diameter d of the core d , V d =π*d^2*L / 4, the unit is cm 3 .

[0056] S2. Configure the simulated formation aqueous solution, saturate the core for 24 hours under a pressure ...

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Abstract

The invention discloses a method for testing the saturation-resistance increase coefficient of shale with bedding fractures, the method is based on a resistivity tester, and the resistivity tester includes a resistivity meter, a core holder, a gas source and a meter balance; the core holder includes a kettle body shell and a rubber sleeve arranged in the kettle body shell, and also includes a kettle body plunger, a core upper plunger and a rock core lower plunger; the upper end of the kettle body shell is open, and the kettle body The plunger is blocked on the upper end of the kettle body shell; the rubber sleeve and the kettle body shell are set separately. The space between the inner wall of the kettle body shell and the outer wall of the rubber sleeve is the inner cavity of the kettle body, and the inner cavity of the kettle body is filled with different Conductive silicone oil; the upper core plunger and the lower core plunger are respectively sealed at the upper and lower ends of the rubber sleeve, and a clamping space for holding the core is formed between the upper core plunger and the lower core plunger; this application is used throughout During the experiment, the sample remains still in the rubber sleeve to avoid damage to the sample due to human movement and other reasons, and to protect the sample.

Description

technical field [0001] The invention relates to the technical field of reservoir evaluation of oil and gas reservoirs, in particular to a saturation-resistance increase coefficient test method for shale with bedding fractures. Background technique [0002] The matrix porosity and permeability of shale are generally low, and a large number of bedding fractures are an important factor to improve the storage and transportation characteristics of shale oil and gas. Fractures refer to various fractures or fracture surfaces in rocks due to loss of cohesion. The existence of bedding fractures in shale significantly affects the distribution and migration of original fluids in the formation. Archie's formula is the preferred model for solving formation oil-bearing water saturation using electrical logging. Estimating reservoir water saturation based on the Archie formula is one of the important methods for evaluating the oil and gas saturation of formation rocks. This method reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04G01N15/08B25B11/00
CPCB25B11/00G01N15/088G01N27/041
Inventor 姜艳娇董旭周建石颖于英华郭志华
Owner NORTHEAST GASOLINEEUM UNIV