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Method for making high smectite sandstone casting slice

A technology of casting thin slices and smectite, which is applied in the direction of sampling devices, etc., to achieve the effect of avoiding false phenomena

Active Publication Date: 2010-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this slab-making method is that when casting a thin-schist rock-like casting, a casting instrument is used to carry out the porous epoxy resin casting of the rock sample.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0015] In the Shaofanggou Formation of B701 well and B703 well, 5 samples were selected in the well section not containing oil, and the same block samples were respectively made as pore structure parameters according to the method of washing oil without heating) and washing oil with heating (conventional method) ( faces, etc.).

[0016] The process steps of the high smectite sandstone casting thin slice production method are as follows:

[0017] 1 sampling

[0018] 1.1 Preparation before sampling

[0019] According to the core description, it is judged that the sample is oil-free sandstone.

[0020] 1.2. Sampling

[0021] Requirements: Oil-free sandstone must be used. The purpose of selecting oil-free samples in this method is to wash the oil without heating. Generally, oil-bearing rock samples for measuring parameters such as porosity and permeability must be washed with oil before measurement.

[0022] 2 Sampling of oil-free samples

[0023] Diamond core bits and saw ...

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PUM

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Abstract

The invention relates to a method for preparing casting body slices of high steatite sandstone. Firstly, high steatite sandstone samples without containing oil are selected, are drilled by saturated brine into cylindrical or cubic samples without containing oil, and are cut into sandstone samples of 25mm*25mm*25mm, and the sandstone samples are eluted for removing oil and aired at a normal temperature. In a normal temperature state, in a vacuum oven, negative pressure is continuously kept at -0.08MPa, and the sandstone samples are dried in vacuum for 48 hours so that toluene and water molecules are drawn out by the negative pressure, die casting is carried out to the sandstone samples by a blowhole casting body instrument at the normal temperature, die-casting liquid of epoxy resin, a 593curing agent and a pigment in the mass ratio of 100 : 35 : 1 is poured in the conditions that die-casting time is 1 hour, pressure is 30MPa, and a vacuum value is greater than 8*10 <-2> torr. After the die casting, the casting body is ground into slices without cooking glue. The invention truly reflects blowhole structure parameters in strata and takes important effect on the right judgment of the quality of a reservoir property.

Description

Technical field: [0001] The invention relates to a method for making flakes of high-smectite clay mineral castings. Background technique: [0002] At present, the cast thin section method used in China is based on the general rock section method in the Petroleum and Natural Gas Industry Standard SY / T 5913-2004 Rock Section Method of the People's Republic of China as the background technology. It is for general rocks to be sliced ​​according to the standard. [0003] The shortcoming of this slab making method is, when casting thin schist rock sample casting body, use casting instrument to carry out rock sample pore epoxy resin casting body. No matter what kind of rock, it needs temperature when casting, and clay minerals like high smectite, when exposed to water, will dehydrate and expand when heated, destroying the pore structure. Artificially enlarged pores, throats and microcracks. Artificially expand the porosity of the pores. Does not reflect true porosity in the for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/06
Inventor 张丽霞李民李培俊王国先李惠清
Owner PETROCHINA CO LTD