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Potential-based spontaneous percolation measuring device

A technology of spontaneous imbibition and measurement device, which is applied in the field of spontaneous imbibition measurement of rock core and potential-based spontaneous imbibition measurement device, which can solve the problems of inaccurate measurement results and errors, and achieve the effect of easy implementation and simple structure

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

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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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  • Potential-based spontaneous percolation measuring device

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Such as figure 1 As shown, a potential-based spontaneous imbibition measurement device includes a confining pressure control system, a potential monitoring system, and a differential pressure control system.

[0063] The confining pressure control system includes a frame 1, a rubber cylinder 2, a rock core 3, a confining pressure valve 4, a confining pressure pump 5, and hydraulic oil 6. The upper part of the frame 1 is a cylinder 7, and the lower part is a water storage space 8. Cylinder 7 is made of stainless steel material. The rubber cylinder 2 is placed between the cylinder 7 and the rock core 3, the rock core 3 is placed in the rubber cylinder 2, the confining pressure valve 4 and the confining pressure pump 5 are placed outside the cylinder 7 and connected with the rubber cylinder 2, the rubber cylinder 2 Filled with hydraulic oil 6. Hydraulic oil can exert confining pressure on the core. After opening the confining pressure valve, adjust the confining pressu...

Embodiment 2

[0090] A potential-based spontaneous imbibition measurement device and measurement method, which are basically the same as Embodiment 1, the difference is that, as Figure 5 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

[0092] 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 potential-based spontaneous percolation measuring device which comprises a confining pressure control system, a potential monitoring system and a pressure difference control system. The confining pressure control system comprises a rack, a rubber cylinder, a core, a confining pressure valve, a confining pressure pump and hydraulic oil. The potential monitoring system comprises a constant-voltage power supply, a mesh-shaped positive electrode, a meshed-shaped negative electrode, a data transmission line, a potential measuring sheet and a fixed-value resistor disc. The pressure difference control system comprises a pressure meter, a water storage space, a communicating pipe, a pond, a communicating valve, a hand pump and an emptying valve. The potential-based spontaneous percolation measuring device is simple in structure, easy to realize, and capable of monitoring the change of saturability on all circumferential places of the core in a spontaneous percolation process over time; the potential-based spontaneous percolation measuring device is capable of measuring the change of the saturability of the core in the spontaneous percolation process over time under the condition of applying different confining pressures; the potential-based spontaneous percolation measuring device is further capable of measuring the change of the saturability of the core in a displacement process over time under the condition of applying different pressure differences to two ends of the core, and knowing parameters such as a water absorption rate, a capillary force and a water absorption quality of the core.

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 device. 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): G01N15/08
Inventor 申颍浩李曹雄葛洪魁王小琼杨柳陈浩任凯栾国华刘倩
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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