Method and device for determining setting depth of heat preservation, heat insulation and eccentric wear prevention oil pipe

Abstract

The invention discloses a method and device for determining the setting depth of a heat preservation, heat insulation and eccentric wear prevention oil pipe, and belongs to the technical field of exploitation in oil fields. The method comprises the steps that oil well foundation data are enrolled according to a geology project firstly, then an oil well shaft temperature field control equation and a well shaft heat-transfer equation are determined, and finally the setting depth of the heat preservation and heat insulation oil pipe is worked out through an iteration method. The method and device for determining the setting depth of the heat preservation, heat insulation and eccentric wear prevention oil pipe have the beneficial effects that by applying the method for determining the setting depth of the heat preservation, heat insulation and eccentric wear prevention oil pipe to two oil wells on site, the temperature of wellheads is increased by 16.4 DEG C averagely, the purposes of improving the temperature of the wellheads of the oil wells and reducing investment of the heat preservation and heat insulation oil pipe are achieved, meanwhile, eccentric wear of the oil wells is prevented, and the application period of an oil well inspection pump is averagely prolonged by 140 days or over. The method and device are used for determining the setting depth of the heat preservation and heat insulation oil pipe.

Description

Technical field [0001] The invention relates to the technical field of oil production in the oil field, in particular to a method and a device for determining the running depth of an oil pipe for thermal insulation and anti-eccentric wear. Background technique [0002] In the oil field production process, universal tubing is often used for production. When the crude oil flowing out of the reservoir is lifted to the ground by the pump, a large amount of heat is lost to the formation through the oil casing annulus, casing and cement ring. On the one hand, the temperature of the crude oil in the wellbore is lower than the waxing point, which causes waxing in the oil well. On the other hand, the fluidity in the wellbore of the crude oil well becomes worse, which increases the load of the pumping unit and increases the energy consumption. The oil collection process requires heat tracing or water-mixing transportation; this affects the normal production and operation of the oil well. ...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil field production, common oil pipes are often used for production. When the crude oil flowing out of the oil reservoir is lifted to the ground by the oil well pump, a large amount of heat is lost to the formation through the oil casing annulus, casing, and cement ring. On the one hand, the temperature of crude oil in the wellbore is lower than the waxing point, resulting in waxing in the oil well; Heat tracing or water-mixed transportation is required during the oil collection process; it affects the normal production and operation of the oil well

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