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Shale physical model and preparation method and device of saturated oil shale core sample

A technology of a physical model and a preparation device is applied in the preparation of oil-saturated shale core samples and the field of shale physical models, which can solve the problems of difficult oil-saturated cores and difficult acquisition of core samples, and achieves good results. , the effect of reducing the contact area

Pending Publication Date: 2022-07-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a shale physical model, a preparation method and device for oil-saturated shale core samples, so as to solve the problems of difficulty in obtaining core samples with oil reservoir characteristics and difficulty in core saturated oil

Method used

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  • Shale physical model and preparation method and device of saturated oil shale core sample
  • Shale physical model and preparation method and device of saturated oil shale core sample
  • Shale physical model and preparation method and device of saturated oil shale core sample

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Embodiment approach 1

[0056] The method for preparing the physical model of shale in the prior art is to spray the cementing agent 300 directly on the surface of the sand grains 100. The existing problems are: such as figure 1 As shown, even if the droplets are small, they are distributed on the surface of the sand grains 100 in the form of local adsorption. During the pressing process, the cementation between the sand grains 100 is not uniform; the cementing agent 300 is too concentrated between the pores (such as figure 1 Middle position A), occupying a lot of pore space; the cement 300 is partially adsorbed (such as figure 1 In the middle position B), it does not have a cementing effect; the surface of the small particles is easily completely wrapped by the cementing agent 300 (such as figure 1 In the middle position C), the rock surface properties are lost.

[0057] like figure 2 As shown, the present invention provides a physical model of shale, the components of which include sand particle...

Embodiment approach 2

[0066] See figure 2 , the present invention also provides a method for preparing a saturated oil shale core sample, the preparation method comprising:

[0067] Mixing the sand grains 100 and the water-absorbing solid-phase binder 200 uniformly to obtain a solid-phase raw material, wherein the particle size of the solid-phase binder 200 is smaller than that of the sand particles 100;

[0068] Dilute the binder 300 with water to obtain a binder solution;

[0069] The solid phase raw material is sprayed with the binder solution and mixed evenly to obtain the raw material to be pressed, for example, the spraying method is ultrasonic spraying;

[0070] The raw material to be pressed is immersed in oil for pressing to obtain a saturated oil shale core sample.

[0071] It is known from the existing research results that the genesis of shale oil is the direct transformation of organic matter in the rock pores, which is significantly different from the accumulation process of first ...

Embodiment approach 3

[0077] like image 3 As shown, the present invention also provides a preparation device for saturated oil shale core samples, which is used for the preparation method of saturated oil shale core samples in Embodiment 2, for preparing saturated oil shale core samples, the preparation device includes: A pressing cylinder, an upper pressurizing pipe 9 , a lower pressurizing pipe 10 , an upper communicating pipe 11 , a lower communicating pipe 12 , a pressurizing container 13 for accommodating pressurized liquid, and a pressurizing pump 14 .

[0078] Wherein, the pressing cylinder comprises a cylinder body 1, an upper end cover 2 and a lower end cover 3 respectively arranged at the upper and lower ends of the cylinder body 1, and an upper piston 4 and a lower piston 5 arranged in the cylinder body 1. The upper end cover 2 and the cylinder body 1. Removably sealed connection, the lower end cover 3 and the cylinder body 1 are detachably sealed connection, the upper piston 4 and the ...

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Abstract

The invention provides a shale physical model and a preparation method and device of a saturated oil shale core sample, the shale physical model comprises sand grains, a cementing agent and a water-absorbing solid-phase cementing material, and the shale physical model is formed by spraying the uniformly mixed sand grains and solid-phase cementing material with the cementing agent diluted by water and then pressing; the preparation method of the saturated oil shale core sample comprises the following steps: uniformly mixing sand grains and a solid-phase cementing material with water absorption; diluting the cementing agent with water; spraying a cementing agent solution on the solid-phase raw material and uniformly mixing; and soaking the to-be-pressed raw material in the oil liquid for pressing. According to the shale physical model, by means of the water-absorbing solid-phase cementing material, under the dual action of the cementing agent and the solid-phase cementing material, the cementing quality is guaranteed, a pore structure with the characteristics of shale is formed, a saturated oil shale core sample is pressed in an oil phase environment, and the shale core sample is obtained. And the distribution condition of the oil phase in the pores in the actual shale oil reservoir is completely simulated.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a shale physical model, a method and a device for preparing oil-saturated shale core samples. Background technique [0002] With the gradual expansion of the scale of shale oil production, the research on the seepage mechanism of shale oil has become more and more in-depth. Oil displacement experiment is one of the most basic research contents. Naturally, researchers use existing reservoir development technology to develop shale oil. Core flooding technology has developed from high permeability (permeability greater than 100mD) reservoirs to medium and low permeability reservoirs, and gradually extended to ultra-low permeability reservoirs. With the decrease of reservoir permeability, the technical difficulty of displacement experiment gradually increases. When the permeability decreases below 0.1 mD (such as the permeability of shale), the existing flooding experi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/38G09B23/40
CPCG01N1/286G01N1/38G09B23/40
Inventor 马德胜李实陈兴隆韩海水姬泽敏
Owner PETROCHINA CO LTD
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