Novel integration technique for improving recovery ratio of thick oil with high thickness and low yield

Abstract

The invention provides a novel integration technique for improving a recovery ratio of thick oil with high thickness and low yield. The technique comprises the following steps of: extracting the thick oil: preparing a thick oil dispersing drag reducer into 1 percent aqueous solution serving as a sample a and 0.125 percent aqueous solution serving as a sample b, mixing 1,900-2,500 milligrams / liter of sample a and 230-280 milligrams / liter of sample b uniformly, and injecting the mixture in a well by using a casing, mixing medicaments on the pump with the thick oil to form an oil-in-water emulsion, lifting the emulsion to the mouth of the well by an oil pumping unit, and feeding the emulsion in an oil-water separating tank through a pipeline; breaking the emulsion and separating water from oil: adding a corresponding amount of efficient thick oil demulsifier continuously to prepare 1 percent aqueous solution while the thick oil enters the oil-water separating tank, wherein the adding amount is 90-110 milligrams / liter, and the reaction time is more than 2 hours, namely, oil-water separated sewage is to be treated; treating and recycling the sewage: pumping the sewage in the tank, adding a special coagulant to prepare 2 percent solution, wherein the adding amount is 80-120 milligrams / liter, adding a composite anti-incrustation corrosion inhibitor simultaneously to prepare 2 percent aqueous solution, wherein the adding amount is 48-53 milligrams / liter; adding a DL-328 industrial sterilant to prepare 5 percent aqueous solution, wherein the adding amount is 85-115 milligrams / liter, and blending with clear water, and injecting in the stratum to retain the pressure balance of the stratum.

Description

technical field [0001] The present invention relates to the technical improvement of heavy oil exploitation. The technology is divided into the steps of heavy oil recovery, demulsification oil-water separation, sewage treatment and reuse; The combined use of composite scale and corrosion inhibitors and DL-328 industrial sterilizer can produce a technical integration effect that can enhance the recovery of high-viscosity and low-yield heavy oil. Background technique [0002] In recent years, the production of heavy oil in my country has been continuously increasing, especially the success of using thin oil recovery technology has inspired new research ideas for scientific and technological workers. This is mainly because my country is rich in heavy oil. According to experts' estimates, heavy oil resources are more than ten times higher than conventional crude oil resources, and it has a strategic position to replace petroleum energy. However, due to the poor fluidity of heav...

AI Technical Summary

Problems solved by technology

Due to the high viscosity of heavy oil, the method of blending thin oil is mostly used to reduce the viscosity, but today, the production of thin oil is decreasing day by day, the thick oil mixed with thin oil viscosity reduction technology has encountered severe challenges; There are only thin oil resources, and the inherent characteristics of heavy oil are also destroyed, which greatly increases the cost of crude oil extraction

[0004] At present, the production of heavy oil is mainly mixed with thinner oil for viscosity reduction (ratio of mixed with thinner oil>1), which can solve the problem of crude oil viscosity less than 10×10 4 mPa.s (at 50°C) heavy oil recovery, but higher than 10×10 4 Heavy oil of mPa.s (at 50°C) cannot be recovered

This is mainly due to the shortage of thin oil blending resources, and there is no thin oil to blend; the water content of oil wells gradually increases, and the thinning effect becomes worse; the quality of crude oil decreases, which may also change the quality of heavy oil, which is not conducive to the refining of later oil; Rising prices, lower economic returns, unexploitable deep heavy oil, impeding industrial development, etc.

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