Gel curing solution and preparation method thereof

Abstract

The invention discloses a gel curing solution and a preparation method thereof. The gel curing solution comprises blast furnace slag, an activating agent, a conditioning agent and water, wherein as the mass of the water is used as a reference, the masses of the blast furnace slag accounts for 40-60% of that of the water, the activating agent accounts for 1-3% of that of the water and the conditioning agent accounts for 3-6% of that of the water. The preparation method comprises the following steps: firstly dissolving the activating agent and the conditioning agent in the water; after the dissolution is completed, adding the blast furnace slag slowly; and then stirring at a high speed until the mixture is mixed uniformly. When the prepared gel curing solution is used for well cementing operation of a slim hole and a coal-seam gas well with low formation pressure or injection pressure, the cementing quality of two interfaces of a cemented well can be improved, thereby improving the interlayer sealing and isolating effect and preventing oil, gas and the water from moving with one another; and when the gel curing solution is used for drilling engineering leakage stopping construction and oil well water shut-off and profile control operation, the success rate of leakage stopping and the water shut-off and profile control operation can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of petroleum and coal bed gas engineering, and in particular relates to a gel solidified liquid and a preparation method thereof. Background technique [0002] In oil and gas exploration and development drilling, the casing is run in the wellbore and cement is injected into the annular space between the casing and the wellbore. This process is called well cementing. The cemented surface between the casing and the cement sheath is called the first cementing interface, and the cemented surface between the cement sheath and the formation is called the second cemented interface. In order to solve the failure problem of the cementing interface, the usual method is to develop new cement additives to improve the performance of cement, so as to improve the cementing ability of the cementing interface. However, since the cement slurry and drilling fluid mud cake cannot be solidified as a whole, and the conventional ...

AI Technical Summary

Problems solved by technology

[0003] In addition, in the conventional cement slurry system, the drilling fluid remaining on the well wall cannot solidify itself, and the mud cake of the drilling fluid and the cement slurry cannot be solidified and bonded together as a whole, resulting in the failure of the cementing interface. The main reason for the emergence of "candied haws" wellbore

In terms of leak plugging and water plugging, the plugging agents and water plugging agents currently used generally have low plugging strength, low success rate, and short validity period.

Images