Temporary plugging agent and preparation method thereof

Abstract

The invention provides a temporary plugging agent and a preparation method thereof. With the total mass of the temporary plugging agent as 100wt%, the temporary plugging agent comprises the raw materials of 25-35wt% of a high temperature salt-resistant extra high molecular polymer, 25-30wt% of modified oil soluble resin, 15-20wt% of a cross-linking agent, 5-10wt% of a surface active agent, 1-5wt% of solid particles and 1-5wt% of a fiber temperature-resistant material, wherein the sum of the mass percents of the raw materials of the temporary plugging agent is 100%; and the raw materials of the temporary plugging agent are all solid particles, and the diameters of the particles are 200-300 meshes. The invention further provides the preparation method of the temporary plugging agent. The temporary plugging agent can conduct continuous sand washing on an oil well, change of output after operation is not large, and construction and plug removal can succeed for one time; and the temporary plugging agent is suitable for sand washing construction of a heavy oil well, the sand washing effect is good, sand washing is thorough, the leakage amount is less, and the pump inspection period is prolonged.

Description

technical field [0001] The invention relates to a temporary plugging agent and a preparation method thereof, which belong to the technical field of petroleum exploitation. Background technique [0002] The heavy oil wells in Liaohe Oilfield have the characteristics of "sparse, scattered, shallow, and thin", and the sandstone in the oil layer is poorly cemented. After multiple rounds of steam injection huff and puff production, some sand particles are carried out of the ground by crude oil, resulting in the gradual formation of larger pores in the oil layer. [0003] During oil well production, the formation sand is deposited in the wellbore with the liquid flow, which is easy to sand and bury the oil layer, or enters the pump barrel to cause the pump to be stuck; during the operation of sand washing, due to the serious shortage of the formation, the sand particles re-enter and deposit in the wellbore with the sand washing fluid. In the large channel, the sand does not return...

AI Technical Summary

Problems solved by technology

Therefore, this process has disadvantages such as large formation loss, long liquid drainage period during production, poor sand-carrying ability, and large water consumption.