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Spontaneous imbibition measurement method based on electric potential

A technology of spontaneous imbibition and measurement method, which is applied in the field of potential-based spontaneous imbibition measurement and core spontaneous imbibition measurement, which can solve the problems of inaccurate measurement results and errors.

Active Publication Date: 2015-01-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some human errors in this measurement method, which will lead to inaccurate measurement results. In addition, the measurement device can only measure the change of the quality of water absorbed by the entire core over time, which has certain limitations.

Method used

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  • Spontaneous imbibition measurement method based on electric potential
  • Spontaneous imbibition measurement method based on electric potential
  • Spontaneous imbibition measurement method based on electric potential

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 1 As shown, a potential-based spontaneous imbibition measurement method includes the following steps:

[0059] (1) Debug the measuring device and check the airtightness of the measuring device;

[0060] (2) Dry the rock core to a state without free water, and place it in a rubber cylinder;

[0061] (3) Open the confining pressure valve, adjust the confining pressure pump, and after the confining pressure of the rock core is raised to a certain value, close the confining pressure valve;

[0062] (4) Turn on the constant voltage power supply, record the potential difference between each adjacent measuring probe, and output the measurement data to the computer through the data transmission line;

[0063] (5) Open the vent valve and the connecting valve, adjust the hand pump so that the water surface in the water storage space just touches the bottom of the rock core, and now start to record the changes in the potential of each measuring probe with time;

...

Embodiment 2

[0086] A potential-based spontaneous imbibition measurement device and measurement method, which are basically the same as Embodiment 1, the difference is that, as Figure 6 As shown, the number of potential measuring sheets is twelve, and each potential measuring sheet is connected with a data transmission line, and all the data transmission lines are connected with the computer. The potential measuring sheets are evenly distributed on the inner wall of the rubber tube along the circumferential direction of the rubber tube.

Embodiment 3

[0088] A potential-based spontaneous imbibition measurement device and measurement method are basically the same as the first embodiment, the difference is that the number of potential measurement sheets is sixteen, and each potential measurement sheet is connected to a data transmission line, and all data transmission lines are connected to a computer. The potential measuring sheets are evenly distributed on the inner wall of the rubber tube along the circumferential direction of the rubber tube.

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Abstract

The invention discloses a spontaneous imbibition measurement method based on electric potential. The spontaneous imbibition measurement method comprises the following steps: drying a rock core to a state without free water and putting the rock core into a rubber cylinder; applying confining pressure on the rubber cylinder; switching on a constant-voltage power supply and recording an electric potential difference between adjacent measurement probes; adjusting a hand pump to enable a water surface in a water storage space to be right in contact with the bottom end of the rock core and recording the change of the electric potential of each measurement probe along with time; unloading the confining pressure of the rock core and putting the rock core into a water pool until the rock core reaches a saturated state, and then putting into the rubber cylinder and applying the confining pressure on the rock core; switching on the constant-voltage power supply and recording an electric potential difference between the adjacent measurement probes; analyzing data; and evaluating a spontaneous imbibition rule of the rock core. According to the measurement method, the electric potential difference is applied to the rock core through a spontaneous imbibition measurement device based on the electric potential and the electric potential of each point on the surface of the rock core is measured; and the spontaneous imbibition interface height of the rock core to each type of liquid including fracturing fluid and the like is monitored and the change of liquid saturation degree on the rock core along the time is monitored, so that parameters including water absorption speed, capillary force, water absorption quality and the like of a tested sample can be grasped in real time.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and relates to a rock core spontaneous imbibition measurement technology, in particular to a potential-based spontaneous imbibition measurement method. Background technique [0002] At present, unconventional reservoirs represented by shale gas are characterized by tightness, and their development requires large-scale hydraulic fracturing, and a large amount of water is injected into the formation. Therefore, evaluating the spontaneous imbibition law of reservoir rocks is the most important aspect of unconventional oil and gas development research. one of the key issues. This is mainly due to the following reasons: First, because the pore throats of tight reservoirs are small, and the distribution of throats is mostly at the micro-nano level, the spontaneous imbibition phenomenon caused by capillary force is more obvious than that of conventional reservoirs, which has a great impact ...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N13/00
Inventor 葛洪魁曾义金李曹雄申颍浩张保平周建张旭
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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