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Dense sandstone physical model and manufacture method thereof

A physical model and technology of tight sandstone, applied in the production of artificial tight sandstone physical model, the field of tight sandstone physical model, can solve problems such as difficulty in production

Active Publication Date: 2013-06-05
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some domestic oil exploration and development related units have relatively mature production methods for artificial sandstone models with porosity greater than 20%, but for artificial sandstone models with porosity less than 20%, due to their characteristics of low porosity, low permeability and compactness , has special requirements for clastic particles, cements and processes, and is difficult to manufacture. The technology for making tight sandstone models with low porosity and low permeability is still a blank technology at home and abroad.

Method used

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  • Dense sandstone physical model and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Material selection

[0023] According to the specific requirements for making samples, the type of sand grains (such as quartz sand, feldspar and other natural sand) and grain size are first selected. For samples with larger porosity, sand grains with better particle sorting performance are selected. The scope increases, and the particles above 400 mesh are appropriately increased.

[0024] 2. Ratio of materials

[0025] In order to control the porosity of the sandstone sample within 30%, the content ratio of quartz sand, epoxy resin (model 618-2) and curing agent (model 593) is 6:1:20%.

[0026] In this embodiment, the production method and process are introduced with 80 mesh quartz sand and a press with a pressure of 2MP. See figure 1 As shown, the specific operation is as follows:

[0027] Take a dry and clean bucket as a container, put it on the electronic scale, clear the data, put on gloves, take out the epoxy resin from the electronic incubator, weigh 100g...

Embodiment 2

[0035] Compared with Example 1 in this embodiment, three types of quartz sand, 80 mesh, 100 mesh and 120 mesh, are mixed together in a weight of about 1:1:1 to increase the variation. Epoxy resin (model 618-2) and quartz sand The ratio of sand is 1:10, and 20% curing agent (model 5784) of the mass of epoxy resin is added, and other preparation processes are the same as in Example 1. The tight sandstone physical model of this embodiment is obtained.

[0036] After testing, the density of the artificial sandstone in this embodiment is about 2.09g / cc; the porosity is about 20%; the longitudinal wave velocity is about 3580m / s. It is consistent with the actual sandstone formation parameters and meets the requirements of simulation experiments.

[0037] Using the tight sandstone of this embodiment to make a physical model, the first and third types of AVO phenomena can be successfully simulated.

Embodiment 3

[0039] Compared with Example 1 in this embodiment, quartz sand (containing a small amount of feldspar) selects 120 meshes, 200 meshes and 400 meshes and mixes them together according to the weight of about 1:2:4 to increase the variation. 618-2) with a ratio of 1:9 to quartz sand, and added a curing agent (model 593) of 25% of the mass of epoxy resin, the pressure machine pressure was 6MP, and it was fixed for more than 20 hours, and other preparation processes were the same as in the examples 1. The tight sandstone physical model of this embodiment is obtained.

[0040]After testing, the artificial sandstone of this embodiment has a density of about 2.30 g / cc; a porosity of about 16%; and a longitudinal wave velocity of about 4300 m / s. It is consistent with the actual sandstone formation parameters and meets the requirements of simulation experiments.

[0041] Using the tight sandstone of this embodiment to make a physical model, the first and third types of AVO phenomena c...

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Abstract

The invention provides a dense sandstone physical model and a manufacture method thereof. The method comprises: particle rock flour, epoxy resin in low viscosity and a curing agent are evenly mixed according to a certain ratio and placed into a mold to conduct pressing processing, pressure is over 2MPa, the pressure is maintained so that an even mixture is solidified to a block, and the mixture is taken out and baked to be completely solidified so that a dense sandstone physical model is obtained. According to earthquake physical model technology characteristics and based on relation between practical stratum features and the laboratory model manufacture, the problems may occur in the process of sandstone model design and manufacture are solved so that the technology can be well used for developing sandstone reservoir stratum earthquake wave response simulation research.

Description

technical field [0001] The invention relates to the geophysical research field of oil and gas exploration and development, in particular to a method for making an artificial tight sandstone physical model and the made tight sandstone physical model. Background technique [0002] Natural sandstone is a sedimentary clastic rock with clastic components such as quartz and feldspar accounting for more than 50%. It is formed by accumulation of rocks in the source area through weathering, denudation and transportation in the basin. Rocks are composed of clastic and interstitial materials. In addition to quartz and feldspar, clasts also include muscovite, heavy minerals, and rock debris. The interstitial material includes two components of cement and debris matrix. Common cements include siliceous and carbonate cements; the matrix components mainly refer to finer clay or silty matter deposited with clastics. The composition and structure of interstitials reflect the geological st...

Claims

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Application Information

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IPC IPC(8): G01V1/00
Inventor 欧阳永林狄帮让魏建新黄家强
Owner PETROCHINA CO LTD
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