Anti-waxing agent special for heavy crude well thermal recovery

Abstract

The invention relates to a special wax-proof agent for the thermal recovery of a heavy oil well which belongs to the technical field of oil field chemical product. The technical scheme thereof consists of the materials with the following weight portions: 20 to 30 portions of sherwood oil, 35 to 45 portions of dimethylbenzene, 5 to 10 portions of bottom oil, 3 to 5 portions of alkyl phenol polyoxyethylene ether, 2 to 5 portions of alkanolamides of fatty acid, 10 to 15 portions of fatty acid, 5 to 10 portions of alkaline liquid with a concentration of 25 to 35 as well as 100 to 150 portions of water. The special wax-proof agent has the advantages of high wax-dissolving speed, high viscidity reducing rate, good wax-proof effect, and the like. The efficiency and productivity for the thermal recovery of the heavy oil well can be greatly improved through adding wax-proof agent into the oil well periodically and being matched with a hot water thermal recovery technology; the construction is convenient.

Description

technical field [0001] The invention relates to an anti-wax agent specially used for thermal recovery of heavy oil wells, and belongs to the technical field of oilfield chemical products. Background technique [0002] Heavy oil wells contain a large amount of paraffin-based crude oil in the mining process. One of the current solutions is to put wax inhibitors into the oil wells, and the other is to wash the wells with hot water. Chinese patent (publication number: CN1149613) discloses " a kind of wax removing and preventing agent for oil well that can replace hot washing ", and it is made of sherwood oil 25%, xylene 55%, tower bottom oil 10%, tea 3%, alkane Base phenol polyoxyethylene ether 7% composition. The disadvantages of this wax-removing and anti-waxing agent are that the viscosity-reducing effect is not ideal, the dosage is large, and the use cost is high. The advantages of simple hot water washing well wax removal are low cost and high efficiency. The disadvantage...

AI Technical Summary

Problems solved by technology

The disadvantages of this kind of wax-removing and anti-waxing agent are that the viscosity-reducing effect is not ideal, the dosage is large, and the use cost is high.

The advantages of pure hot water washing well wax removal are low cost and high efficiency. The disadvantage is that when the water fills the wellbore, due to the high water pressure, it can be poured into the formation backward, which will cause the clay minerals in the formation to expand and make the oil layer around the wellbore The decrease in penetration rate will affect the production capacity