Method and device for measuring gelling time of gel

A technology of gel formation time and measurement method, which is applied in the field of profile control and water plugging experiments in oilfields, can solve the problems of gel structure damage, large deviation of measurement results, inability to measure some systems, etc., and achieves good repeatability and accurate gel formation time. Effect

Active Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The present invention mainly aims to provide a method for accurately measuring the gelation time of gels under high temperature and high pressure conditions in order to solve the problems of large deviations in measurement results, damage to the gel structure, and inability to measure some systems in the current gelation time measurement method.

Method used

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  • Method and device for measuring gelling time of gel
  • Method and device for measuring gelling time of gel
  • Method and device for measuring gelling time of gel

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1 Add an inorganic gel system composed of 8% water glass (modulus 3.14) and 0.3% urea into the reaction kettle 4, and immerse the electrode in the middle of the solution, and inject it into the reaction kettle 4 through the booster device 6 Inflate nitrogen to 15MPa, then keep the temperature to 90°C, and keep the pressure inside the reactor constant during the heating process. Start the multimeter 1 to measure the change of system resistance. See the measurement results figure 2 . according to figure 2 From the measurement results, it can be seen that the resistance of the system does not change much in the first 120 minutes, and the resistance of the system increases rapidly from the 120th minute. The resistance of the system increases to the peak at about 140 minutes, and changes little thereafter. Therefore, it can be judged that the initial setting time of the system gel is 120 minutes, and the final setting time is 140 minutes.

Embodiment 2

[0018] Embodiment two Add the flocculation-type inorganic gel system composed of 6% polyaluminum chloride and 3% urea into the reaction kettle 4, and immerse the electrode in the middle of the solution, and fill the reaction kettle 4 with nitrogen to 20MPa through the booster device 6 , and then the temperature was kept constant to 100°C, and the pressure in the reactor was kept constant during the heating process. Start the multimeter 1 to measure the change of system resistance. See the measurement results image 3 . according to image 3 From the measurement results, it can be seen that the resistance of the system does not change much in the first 430 minutes, and the resistance of the system increases rapidly from the 440th minute. The resistance of the system increases to a peak value at about 500 minutes, and changes little thereafter. Therefore, it can be judged that the initial setting time of the system gel is 440 minutes, and the final setting time is 490 min...

Embodiment 3

[0019] Example 3 Add an organic gel system composed of 0.3% polyacrylamide copolymer (molecular weight: 30 million) and 0.3% organic chromium crosslinking agent into the reaction kettle 4, and immerse the electrode into the middle of the solution. The pressure device 6 fills the reactor 4 with air to 10 MPa, and then keeps the temperature at 75° C., and keeps the pressure in the reactor constant during the heating process. Start the multimeter 1 to measure the change of system resistance. See the measurement results Figure 4 . according to Figure 4 From the measurement results, it can be seen that the system resistance does not change much in the first 1090 minutes, and the system resistance increases rapidly from the 1090 minutes. The resistance of the system increases to the peak at about 1190 minutes, and changes little thereafter. Therefore, it can be judged that the gel initial setting time of the system is 1090 minutes, and the final setting time is 1190 minutes. ...

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Abstract

The invention relates to a method and a device for measuring the gelling time of gel. Based on the phenomenon that in the gelling process of the gel, a gel system can form a spatial meshed structure, and the physical and chemical properties of the gel system can change to cause the changes of resistivity of the system, the changes of the conductivity of gel solution in a reaction kettle under the conditions of high temperature and high pressure are measured by utilizing an avometer and an electrode so as to conveniently and accurately measure the gelling time of various types of gel systems, and the measuring results have good repeatability.

Description

technical field [0001] The invention relates to a method and a device for measuring the gelation time of gel under high temperature and high pressure conditions, and belongs to the technical field of oilfield profile control and water shutoff experimental research. Background technique [0002] Gel plugging agent is a commonly used chemical agent in oilfield profile control, water shutoff, channeling and leakage plugging, and its gelation time is an important index in product performance evaluation, which directly affects the smooth progress of on-site construction. However, there is no unified standard for the determination of gelation time, and different determination methods are usually used depending on the properties of the gel system, and the existing determination methods for gelation time have certain deficiencies. As described in the literature "Review of Gel Performance Evaluation Methods for Water Plugging and Profile Control Agents" (Drilling and Production Techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06
Inventor 李遵照吴信荣林伟民赵斌杨昌华陈永浩张俊瑾何佳
Owner CHINA PETROLEUM & CHEM CORP
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