A device and method for continuously injecting light oil to realize cold recovery of heavy oil

Abstract

The invention relates to a heavy oil recovery device and method, in particular to a device and method for continuously injecting light oil to realize heavy oil cold recovery. The technical solution is: connect the injection double-layer isolation pipe at the lower end of the oil well pump barrel, connect the injection suction splitter at the lower end of the double-layer isolation pipe, and set a suction floating ball in the inner cavity of the injection double-layer isolation pipe, and inject the suction shunt The lower end of the injector is connected to the injection diluter, the lower part of the inner cavity of the injection suction splitter is provided with a multifunctional constant pressure isolation plate, and the upper part of the inner cavity of the packer is equipped with a packer seat seal fixed pressure plate, and a Oil pump plunger. The beneficial effects are: there is no risk of scalding during construction, and because the heavy oil cold recovery process is adopted, the risk of blockage of the oil pipeline due to the temperature drop of the extracted heavy oil in the gathering and transportation is also avoided; the dilution source Continuous injection is possible with light oil, which is more plentiful and less expensive than chemically diluted sources.

Description

technical field [0001] The invention relates to a heavy oil recovery device and method, in particular to a device and method for continuously injecting light oil to realize heavy oil cold recovery. Background technique [0002] Heavy oil plays an important role in petroleum production. Due to the characteristics of long molecular chain hydrocarbons and heavy molecular weight, heavy oil has high viscosity and poor fluidity. Therefore, it is difficult to develop heavy oil. At present, the exploitation of heavy oil mainly adopts the method of thermal recovery, which reduces the viscosity of crude oil and improves the fluidity of crude oil by heating the oil reservoir or wellbore, so as to achieve the purpose of increasing the production of oil wells. There are mainly steam injection, heating cables, downhole Heating furnace, electric heating rod, burning oil layer and other methods. However, this thermal mining method not only has high development costs and slow mining speed (...

AI Technical Summary

Problems solved by technology

However, this thermal mining method not only has high development costs and slow mining speed (Note: During injection and production, the well must be stopped and soaked), but also has certain safety risks during the mining process (such as high temperature burns, etc.)

[0003] In recent years, technicians engaged in heavy oil recovery have shifted their attention to the research and application of heavy oil cold recovery. Some progress has also been made in the cold recovery of heavy oil, most of which are in the form of chemical viscosity reducers Generally, the chemical viscosity reducer is injected into the ground through the oil pipe under high pressure on the ground, and then the extraction is carried out. The existing problems are: first, the oil is generally extracted through the plunger pump. When the chemical viscosity reducer needs to be injected , the plunger needs to be taken out, which takes 3-7 days to complete, and the plunger is taken out through operation; after the chemical viscosity reducer is injected, it needs to spend more work time to lower the plunger downhole, which again requires It takes 3-7 days, which reduces the efficiency of cold mining and cannot achieve continuous injection and production

The existing problems are: although no operation is required, the operation time is reduced and the efficiency is improved, but it is suitable for oil areas with water injection wells and production wells, but not for single wells; moreover, the viscosity reducer used is generally chemical Viscosity reducer, which increases the difficulty of processing in the later stage of petroleum refining process

At present, this method has achieved some good results, however, we know that CaC 2 The amount determines the service life of this method, and all oil wells have capacity, so this method is only applicable to the situation of large volume of oil wells. Therefore, this cold recovery method cannot achieve long-term continuous production. After time, the CaC still needs to be replaced 2

Images