Imidazole-enhanced ultrahigh-temperature-resistant liquid rubber plug and gel forming test improvement method thereof

Abstract

The invention provides an imidazole-enhanced ultrahigh-temperature-resistant liquid rubber plug and a gel forming test improvement method thereof, and relates to the field of oilfield chemistry. The imidazole-enhanced ultrahigh-temperature-resistant liquid rubber plug is mainly prepared from the following components in percentage by mass: 5-20% of imidazole, 0.2-0.4% of a stabilizer, 2-4% of a nano material, 2-4% of a polymer, 1-2% of a cross-linking agent and the balance of water. The imidazole-enhanced ultra-high-temperature-resistant liquid rubber plug is prepared from the raw materials, the preparation process is simple, the rubber plug can resist the temperature of 190 DEG C, the initial setting time is 1-1.5 hours, the final setting time is 3.5-4 hours, and the requirements of 2-5 days of shaft temporary plugging and flowback operation of an ultra-high-temperature reservoir (180-190 DEG C) can be met. The improved gel forming test method overcomes influence of the heating rate and the heat transfer material neglected by conventional means, and can further simulate the real underground situation and reduce the experimental error.

Description

technical field [0001] The invention relates to the field of oilfield chemical gel temporary plugging and isolation, in particular to an imidazole-enhanced ultra-high temperature liquid resistant rubber plug and an improved gelation test method thereof. [0002] technical background [0003] With the continuous progress of oil and gas exploration and development, the number of deep wells, ultra-deep wells, high-temperature, and ultra-high-temperature wells is increasing year by year. The temperature of some reservoirs in many oilfields such as Tarim Kuqa, Bohai Sea, and Sichuan Moxi in my country is above 180°C, even reaching 190°C. ℃, which poses a severe challenge to downhole chemical materials. [0004] As a kind of chemical temporary isolation plug, liquid rubber plug (or gel) is widely used in drilling and completion, well killing and workover operations. Its function is to isolate the working fluid from the reservoir, prevent the working fluid from leaking into the forma...

AI Technical Summary

Problems solved by technology

At present, imidazole ionic liquids are mainly used in oil and gas, and their applications are mainly in desulfurization process, surfactants and clay inhibitors, etc., but the problem of high cost has been difficult to carry out field application

However, in the previous experiments, most of the experiments were carried out in an oven at a constant temperature, ignoring the influence of the temperature rise rate of the gel mother liquid in the process of pumping the wellbore, and the bottom of the bottle experiment was often carried out in glass bottles for the convenience of observation, ignoring Effect of wellbore steel alloy on heat transfer

These two aspects will lead to too large errors between the test results and the field results. In order to further reduce the errors, it is necessary to improve on the basis of existing experiments.

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