Hot water injection circulation viscosity reduction system for producing ultra-deep ultra-heavy oil and application method thereof

Abstract

The invention relates to a hot water injection circulation viscosity reduction system for producing ultra-deep ultra-heavy oil and an application method thereof, belonging to the field of viscosity reduction production of heavy oil in an oilfield. The hot water injection circulation viscosity reduction system comprises a ground circulation system and an underground circulation viscosity reduction system, wherein the ground circulation system is formed by sequentially connecting a clear water tank, a water softening device, a softened water tank, a water supply pump, a magnetization device, a water jacket furnace and a water injection pump, which are arranged on a circulating injection pipeline, as well as a pressure relief valve on a circulating outflow pipeline; and the underground circulation system adopts a liquid injection and outflow pipeline constituted by a heat insulation oil pipe annulus, a sleeve annulus and a packer, as well as an inner-layer oil pipe, the packer, a sieve pipe and a screw plug to constitute an oil production pipeline. The hot water injection circulation viscosity reduction system according to the invention can reduce the viscosity of heavy oil, be conductive to production of the ultra-deep ultra-heavy oil and solve the problems of low effective pump efficiency, short pump inspection period of high energy consumption in a viscosity reduction process by light oil blending, and further has the advantages of low oil production cost, easiness in popularization and application and the like.

Description

technical field [0001] The invention relates to a hot water injection cycle viscosity reduction system for ultra-deep and ultra-heavy oil production and an application method thereof, belonging to the field of oilfield heavy oil production for viscosity reduction. Background technique [0002] Ultra-deep and ultra-heavy oil has good fluidity in the reservoir and can directly flow into the wellbore. However, as the heavy oil lifts, heat exchange occurs between the heavy oil and the formation, the temperature decreases, and the viscosity increases, resulting in heavy oil lift. difficulty. In order to enhance the fluidity of heavy oil in the wellbore, wellbore viscosity reduction technology is needed to reduce the viscosity of heavy oil. [0003] At present, the main wellbore viscosity reduction technology for ultra-deep and ultra-heavy oil is blending thinner to reduce viscosity. Viscosity reduction by blending thin oil into the heavy oil in the wellbore, and reducing the vi...

AI Technical Summary

Problems solved by technology

However, there are some unavoidable problems in this technology: thin oil takes up part of the displacement of the pump when mixed with thin oil, resulting in low effective pumping efficiency of mechanically pumped wells; thick oil blocks with scarce oil resources or no thin oil cannot use thin oil to reduce viscosity Technology; uneven mixing of thin oil and heavy oil will cause heavy oil to enter the pump, shortening the pump inspection cycle; there is a price difference between thin oil and heavy oil, and if it is mixed into heavy oil, the sales price will decrease

[0004] At present, for ultra-deep and ultra-heavy oil viscosity reduction production, there is no more effective method than blending thinner

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