Method for measuring viscosity-reducing effect of oil-soluble viscosity reducer suitable for super heavy oil and application of method

Abstract

The invention relates to a method for measuring viscosity-reducing effect of an oil-soluble viscosity reducer suitable for super heavy oil and application of the method. The method comprises the following steps of: thinly mixing a thickened oil sample A and a thickened oil sample B in the same super heavy oil well in batches by utilizing thin oil; adding the oil-soluble viscosity reducer into the mixed sample B, and thinly mixing in batches by utilizing the thin oil; fitting a function relationship between thinning-thickening ratio phi and viscosity tau according to the data of the thinning-thickening ratio phi and viscosity tau of the sample A, wherein the thinning-thickening ratio phi is a ratio of the weight of the added thin oil accounting for the original thickened oil; and introducing the final viscosity number of the mixed system subjected to viscosity reducing and thinning into a fitted relationship, obtaining a thinning-thickening ratio phi agent a, calculating an actual thinning-thickening ratio phi agent n which corresponds to the viscosity number, and calculating to obtain the thinning-thickening ratio reducing amplitude. The testing process is simple, low in requirements on testing equipment and testing conditions and high in repeatability, the evaluation index and onsite production index are consistent in the method, and the testing result and the onsite testing result are high in matching degree.

Description

technical field [0001] The invention relates to the field of oil and gas resource development, and relates to a method for measuring the viscosity-reducing effect of an oil-soluble viscosity-reducing agent suitable for super-heavy oil. Background technique [0002] In the field of oil and gas resource development, the exploitation of ultra-deep and ultra-heavy oil resources has always been a worldwide problem, and there is currently no more economical and effective extraction method except for the extraction of viscosity-reducing oil mixed with thin oil. However, there are many problems in the process of viscosity reduction mixed with thin oil, such as large consumption of thin oil, lower quality of thin oil, lower effective power of oil well pump, and limitation of thin oil resources. If an oil-soluble viscosity reducer is added in the production process of viscosity reduction mixed with thin oil, it can greatly save the amount of thin oil, save pump displacement and improv...

AI Technical Summary

Problems solved by technology

However, the viscosity reduction principle of the oil-soluble viscosity reducer is quite different from that of the water-soluble viscosity reducer, and the viscosity of the system is still high after its addition

At present, there are many kinds of oil-soluble viscosity reducers in the market. Although the price difference is small, the viscosity reduction effect on heavy oil varies greatly.

However, due to the large difference in the original viscosity of crude oil, some super heavy oils have aggregation, agglomeration, and deposition, which lead to large differences in viscosity measured at different positions in the same heavy oil system during laboratory experiments.

At this time, if the oil-soluble viscosity reducer is directly added, the viscosity reducer will only work on the evenly dispersed part of the heavy oil system, and will not work on the part of aggregation, agglomeration, and deposition. It is quite different from the effect of the real viscosity reducer, and cannot truly reflect the actual viscosity reduction effect of the viscosity reducer