Dynamic experimental device and method for evaluating performance of scale inhibitor on oil field

Abstract

The invention aims to provide a device and a method for dynamically evaluating the performance of an oil field scale inhibitor. According to the experimental device, the scaling and scale inhibition conditions of a pipeline in a field high-temperature and high-pressure environment are simulated, the scaling and scale inhibition conditions under the condition of different fluid flow patterns are simulated by adjusting the flow and the flow speed through the flow adjusting valve, and two groups of high-pressure and low-pressure pipeline testing devices which are connected in parallel are designed; test pipelines made of different materials can be replaced on the test device through detachable joints, dynamic scaling and scale inhibition experiments can be carried out on multiple groups of pipelines made of different materials at the same time, finally, reaction liquid is collected through a collecting tank, the conductivity reading of the reaction liquid of each pipeline is recorded at the same time, and the conductivity reading is compared with the conductivity of a blank control group. The scale inhibition performance of the scale inhibitor and the scaling condition of the pipeline are represented by comparing the residual concentration of scaling ions fitted by the conductivity with the initial scaling ion concentration, and meanwhile, a rock core dynamic displacement experiment device is arranged, so that the improvement degree of the scale inhibitor on the permeability damage of the rock core is further evaluated; and a foundation is laid for screening of the oil field scale inhibitor and evaluation and development of the scale inhibition performance of the scale inhibitor.

Description

technical field [0001] The invention relates to the field of oil field evaluation experiment devices, in particular to a device and method for dynamically evaluating performance of oil field scale inhibitors. Background technique [0002] Most of the domestic oil fields have entered the middle and late stage of exploitation, the formation energy is seriously short, and the output has dropped sharply. From the perspective of technical perfection and economic benefits, water injection development is widely used in China. Due to the incompatibility of water bodies and changes in the physical and chemical factors of underground fluids, a large amount of scaling will be caused on formations, wellbores and surface pipelines, resulting in oilfield production reduction or even well shutdown. [0003] At present, the scaling problem is solved by injecting antiscalant, but the effect of on-site application is not good. The main reason is that there are the following problems in the ...

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Problems solved by technology

[0003] At present, the scale problem is solved by adding antiscalant, but the effect of on-site use is often not good

The main reason is that there are the following problems in the screening of scale inhibitors and performance evaluation of scale inhibitors: First, the main method of evaluating scale inhibitors in the laboratory is mainly based on static experiments, which cannot reflect the performance of scale inhibitors under different pressures, fluid flows, etc. factors; at the same time, the engineering site is a dynamic environment, and the amount of scaling is larger than that in a static environment; secondly, the current dynamic evaluation instrument is complicated to operate and the steps are cumbersome, and it cannot simultaneously scale the pipelines of various materials The third is that in the dynamic scaling experiment, the performance of the antiscalant is generally obtained by visually comparing the growth and distribution of the pipeline scale sample with the scale of the blank control group, and the performance of the scale inhibitor cannot be accurately evaluated. Scale performance, in order to solve the above problems, the present invention provides a dynamic evaluation device for the performance of oilfield scale inhibitors

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