Method for evaluating paraffin control effect of oil soluble paraffin remover and inhibitor

Abstract

The invention provides a method of evaluating the paraffin control effect of an oil soluble paraffin remover and inhibitor. The method comprises the following steps: step one, preparing crude oil forthe experiment; step two, measuring the paraffin precipitation temperature (T1) of the crude oil by a rheometer; step three, adding an oil soluble paraffin remover and inhibitor into the crude oil; step four, measuring the paraffin precipitation temperature (T2) of the crude oil with the oil soluble paraffin remover and inhibitor; and step five, according to the paraffin precipitation temperature(T1) and the paraffin precipitation temperature (T2), calculating the decreased value of paraffin precipitation temperature (T): T=T1-T2. In the prior art, the paraffin control effect is evaluated bycalculating the mass of precipitated paraffin on the basis of the principle of paraffin precipitation. The provided method takes paraffin precipitation temperatures as the evaluation index, the detection becomes convenient, the detection results are stable, and the experimental results are good in parallelism and repeatability.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for evaluating the wax-repelling effect of an oil-soluble wax remover and preventive agent. Background technique [0002] Wax usually exists in a dissolved state under oil reservoir conditions. However, during the production process, waxy crude oil rises along the tubing. As the pressure continues to decrease and light components continue to escape, when the crude oil is exposed to a temperature below the critical When the surface reaches the cloud point, wax deposits occur. There are several mechanisms for wax deposition, among which the diffusion of wax molecules to cold surface (pipe wall) molecules and the shear diffusion of crystallized wax are dominant. Wax crystals are in the form of flakes and form a solid three-dimensional network. Therefore, the wax crystal structure has a certain degree of firmness at a certain temperature. If it is knotted in th...

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Problems solved by technology

However, in the actual operation, it was found that due to the fact that the wax deposition tube is not a standard part, there are differences in the detection of different wax deposition tubes, and the parallelism and repeatability of the test results are poor.

In addition, wax is often precipitated in the pipeline during the experiment, which blocks the pipeline and leads to the failure of the experiment

[0005] Sinopec procurement standard Q / SHCG 67-2013 and PetroChina standard SY / T6300-2009 evaluate the wax prevention effect based on the change of wax deposition quality, but there are many factors affecting the quality of wax deposition, the test result is not stable, and it does not have a good quality. Parallelism and repeatability, so it is not suitable as a detection indicator

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