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Rock core preparation method

A production method and core technology, applied in the field of petroleum exploration, can solve problems such as unreliable results and failure to reach the nanometer level, and achieve reliable results

Active Publication Date: 2014-10-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the core pores produced by the above three commonly used methods cannot reach the nanometer level, and the results obtained by using the above methods for physical simulation are difficult to be reliable. Therefore, for the physical simulation of unconventional reservoirs, there is an urgent need. A kind of core production method can produce the core with internal pores reaching nanoscale

Method used

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Examples

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Effect test

Embodiment 1

[0068] Take a piece of zirconia nanoporous material, cut and drill to obtain 12 cylinders with a diameter of 2 mm and a length of 10 mm. The outer surface of the cylinder is polished with 1800 mesh sandpaper, cleaned with deionized water and absolute ethanol for 20 minutes, and then After vacuum drying at 80°C for 24 hours, a fixed-shaped filler, namely cylindrical nanoporous zirconia, was obtained;

[0069] Weigh 100g of solid glass beads with a particle size of 70 μm to 150 μm, wash them repeatedly with deionized water for 3 times, dry them with air, and fully mix them with 15 g of a uniform cement with potassium silicate: calcium silicate 100:2, and keep it before adding it to the mold. Stir to obtain 115g of evenly mixed diagenetic raw material;

[0070] Add 27 g of the obtained diagenetic raw material into a cylindrical diagenetic mold with a diameter of 30 mm, pre-compact it with a pressure of 20 MPa for 0.5 min, put 4 pieces of the obtained cylindrical nanoporous zircon...

Embodiment 2

[0074] Take a piece of zirconia nanoporous material, cut it, and use hollow drills of different diameters to drill a ring with an outer diameter of 30mm, an inner diameter of 27mm, and a height of 20mm. Ultrasonic cleaning for 20 minutes, followed by vacuum drying at 80°C for 24 hours to obtain a fixed-shaped filling, that is, a ring-shaped nanoporous zirconia;

[0075] Weigh 30g of solid glass beads with a particle size of 70μm to 150μm, wash them repeatedly with deionized water for 3 times, dry them with air, and fully mix them with 2g of cement with a uniform configuration of potassium silicate:calcium silicate 100:2, and keep it before adding it to the mold. Stir to obtain 32g of evenly mixed diagenetic raw materials;

[0076] Add 6 g of the obtained diagenetic raw material into a cylindrical diagenetic mold with a diameter of 30 mm, pre-compact it with a pressure of 20 MPa for 0.5 min, put the obtained annular nanoporous zirconia, fill the surrounding and inside with 26 g...

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Abstract

The invention discloses a rock core preparation method. The rock core preparation method comprises the following steps: putting a diagenesis raw material and nanoporous filler into a diagenesis mold, so as to prepare a nanoporous artificial rock core green body; putting the nanoporous artificial rock core green body into a diagenesis environment, and carrying out diagenesis, so as to obtain a primary nanoporous artificial rock core; and carrying out demolding processing on the primary nanoporous artificial rock core, so as to obtain a nanoporous artificial rock core. The artificial rock core prepared by virtue of the rock core preparation method has nano-scale pores.

Description

technical field [0001] The present application relates to the field of petroleum exploration, in particular to a method for making a rock core. Background technique [0002] Petroleum is stored in the pores of rock formations, and it is of great significance to guide oil exploitation by observing the characteristics and distribution of pores in rock formations. At present, physical simulation is usually used to simulate rock formations for observation. The experimental model used in physical simulation is mainly the core model. Due to the difficulty of taking out natural cores and the high cost, artificial cores are usually used instead of natural cores for physical simulation experiments. [0003] At present, the commonly used methods for making artificial cores include quartz sand epoxy resin cementing, quartz sand or glass ball filling and quartz sand aluminum phosphate sintering. The method for cementing the quartz sand with epoxy resin is to cement the quartz sand and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 王晓琦崔京钢孙亮李建明金旭
Owner PETROCHINA CO LTD
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