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Artificial carbonate rock core with developed secondary pores and preparation method thereof

A carbonate rock and core technology is applied in the field of artificial carbonate rock core and its preparation, which can solve the problems of unsatisfactory and difficult to accurately describe the seepage characteristics of carbonate rock reservoirs, etc.

Inactive Publication Date: 2019-10-11
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] It can be seen that the current methods of making artificial carbonate rock cores cannot meet the needs of carbonate rock seepage medium for physical simulation of oil and gas reservoirs, making it difficult to accurately describe carbonate rock reservoirs in indoor physical simulation of carbonate rock porous media seepage characteristics

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  • Artificial carbonate rock core with developed secondary pores and preparation method thereof
  • Artificial carbonate rock core with developed secondary pores and preparation method thereof
  • Artificial carbonate rock core with developed secondary pores and preparation method thereof

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Embodiment

[0043] Production process such as figure 1 shown.

[0044] (1) Analysis of reservoir geological data

[0045] According to the geological data of the reservoir, the core data and thin section data are analyzed to obtain the types of core minerals in the original target reservoir, the volume percentage of various minerals, and the primary porosity, secondary porosity and permeability of the target core.

[0046] Specific analysis of a target rock sample: through XRD testing, the target core is pure component limestone; thin section data shows that the primary porosity of the core is 17%, and the secondary porosity is 3%; the permeability of the core is 231mD.

[0047] (2) stone powder selection

[0048]According to the core mineral type of the target reservoir, the ratio between dolomite and limestone is quantitatively controlled in proportion. The mineral raw materials of the above-mentioned dolomite and limestone can be obtained through outcropping in the field, or they ca...

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Abstract

The invention discloses an artificial carbonate rock core with developed secondary pores and a preparation method thereof. The method comprises the following steps of according to geological data of oil deposit, analyzing core data and sheet data, and acquiring type data of core minerals in an original target reservoir to determine percentages by volume of dolomite powder and grey rock powder andpercentages by volume of different particle diameters; then mixing the powder with a cementing agent and then pouring into a mold, and wholly compacting, heating and curing, thus acquiring an artificial carbonatite rock core with the primary porosity and permeability of primary pores; placing the artificial carbonatite rock core into a vacuum environment; and then adding acid liquor onto the artificial carbonatite rock core for reacting, monitoring during a reaction process until the secondary porosity and permeability of the needed rock core minerals are reached, and thus acquiring the artificial carbonate rock core with the developed secondary pores. The artificial carbonate rock core and the preparation method thereof provided by the invention achieve the quantitative control of the primary pores and secondary pores of the artificial carbonatite rock core, so as to be applied to the field of oilfield development and research and / or research fields related to the seepage phenomenon in the carbonatite rock medium.

Description

technical field [0001] The invention relates to an artificial carbonate rock core with secondary pores and a preparation method thereof, belonging to the field of carbonate rock oil and gas field development. Background technique [0002] Carbonate oil and gas fields are an important part of global oil and gas resources. In order to improve the development effect of such reservoirs, it is inevitable to conduct experimental research on the seepage process and law of fluids in carbonate reservoirs in the laboratory. At present, there are three main ways to obtain rock samples for laboratory experiments: one is reservoir coring. Due to the high cost of reservoir coring, the number of coring is limited, and the number of cores taken from the original reservoir is difficult to meet the requirements of laboratory experiments. ; Second, it is derived from outcrops in the field. It is difficult for such cores to be consistent with the target oil reservoir in terms of rock compositio...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01N15/08
CPCG01N1/28G01N1/286G01N1/36G01N15/082
Inventor 李长勇邱凌刘月田杨仁锋刘逸盛郭胜李竞薛亮唐嘉伟孙福亭王云鹏李松琦
Owner CHINA NAT OFFSHORE OIL CORP
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