A kind of dense artificial sandstone core with dual control of temperature and pressure and its preparation method
A kind of artificial sandstone, dense technology, applied in the field of artificial core and its preparation, can solve the problems of large pore diameter, unsatisfactory, high permeability, etc., and achieve the effect of high similarity
Active Publication Date: 2018-02-02
PETROCHINA CO LTD
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Problems solved by technology
[0012] (2) No authigenic mineral crystal growth: due to the low temperature during the solidification process of the core, no fluid participation, and the particle surface is adhered by mixed colloids, the prepared artificial core lacks authigenic crystals such as clay minerals and quartz;
[0013] (3) Permeability and low permeability—there is a difference in tight reservoirs: the artificial core particles of the quartz sand cementation method are mainly in a suspended contact relationship, mainly colloidal bonding, and there is little direct contact between particles, so the pore diameter is large and the permeability is low. High, mostly greater than 100mD, far from meeting the needs of low permeability—tight reservoir research
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Embodiment 1
[0044] This embodiment provides a kind of dense artificial sandstone core with dual control of temperature and pressure, which is prepared by the following steps:
[0045] Use a sieve of 300 mesh or more to screen artificial quartz sand (select the sand that can pass through the sieve), weigh 100g on the balance, put it in a 500mL beaker, clean the inner wall of the beaker with industrial alcohol in advance, and dry it at 60°C for 5 minute;
[0046] Measure 10 mL of deionized water with a graduated cylinder, add it to the beaker, place the stirring rod in the beaker, set the speed at 300 rpm, stir for 5 minutes, make it fully mixed, and let it stand for 2 minutes;
[0047] Use alcohol to clean the inner wall of the sample tube (inner diameter 2.54cm, length 12cm), dry it with a hair dryer, and seal it with a metal filter at the bottom of the sample tube, the diameter of the steel sheet is 2.54cm;
[0048] Put the mixed sample into the sample tube, add a steel sheet with a dia...
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Abstract
The invention provides a dense artificial sandstone core with double temperature and pressure control and a preparation method thereof. The method includes: mixing 100g-200g of quartz sand with a particle size of 300mesh-500mesh in 100mL-150mL water; raising the temperature to 300°C-350°C, increasing the pressure to 220MPa-250MPa, reacting at constant temperature and pressure for 15h-20h, and reacting for 2h Then inject fluid at equal intervals; the heating rate is 10°C / h, so that the temperature and pressure reach the reaction temperature and pressure at the same time; add 10mL of fluid per 100g of quartz sand; lower the temperature and pressure, and wait until the temperature and pressure drop to room temperature and normal pressure. The rate of temperature and pressure drop is the same as the rate of temperature increase and pressure increase, and samples are taken out to obtain dense artificial sandstone cores with dual control of temperature and pressure. The present invention also provides the temperature-pressure double-controlled compact artificial sandstone core prepared by the above-mentioned preparation method. layer effectiveness.
Description
technical field [0001] The invention relates to a dense artificial sandstone core with double temperature and pressure control and a preparation method thereof, and belongs to the technical field of artificial core and its preparation. Background technique [0002] Core-based experimental analysis is an important means for petroleum industry personnel to understand oil and gas reservoirs, study seepage mechanisms, and develop technologies to enhance oil recovery. Therefore, core analysis is valued by petroleum geologists and petroleum engineers. [0003] Due to limitations in the source, quantity, and specifications of natural cores, as well as strong heterogeneity, they cannot meet the requirements of all experiments. Many mechanism exploration and application experiments, such as physical simulation of oil and gas accumulation, reservoir stimulation, displacement experiments, etc., require special-sized cores, so making artificial cores similar to natural cores has become ...
Claims
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IPC IPC(8): G01N1/28
Inventor 吴松涛崔京钢朱如凯孙亮罗忠高志勇崔景伟张响响
Owner PETROCHINA CO LTD