Oil recovery method of closed circulation and viscosity breakback of hot oil in viscous oil well and device

Abstract

The invention relates to an oil recovery method of closed circulation and viscosity breakback of hot oil in a viscous oil well and a device; the method comprises the following steps of: putting the crude oil into a heating system of a special device, adopting two sets of systems with burning of coal or gas or a single system with burning of coal or gas, being capable of adopting one well with one system or a plurality of wells with one system, and heating and injecting the crude oil into the well for closed circulation. The device comprises a heating system, a buffering tank, an injecting circulating system and an oil pumping system; the circulating system comprises a telescoped central pipe and a telescoped outer sleeve; the telescoped central pipe is sleeved into the telescoped outer pipe, an opening of the lower end thereof is a free end and the upper end thereof is connected with a circulating valve, an injecting pipe, a surface flow pipe, a boosting pump, the buffering tank and the outlet of the heating system in sequence; the lower end of the telescoped outer pipe is connected with the oil-well pump and the upper end thereof is connected with a polished rod, a drain pipe and the inlet of a heating system in sequence by a polished rod sealer; and the upper end of the circulating valve is connected with a polished rod eye of an oil pumping unit. The invention has the characteristics of good heat exchange performance, good viscosity breakback, high pump efficiency, and the like and is widely applied in viscous oil recovery technology.

Description

1. Technical field [0001] The invention relates to a heavy oil well oil production method and equipment, in particular to a heavy oil well hot oil closed cycle viscosity-reducing oil recovery method and device. 2. Background technology [0002] At present, the following methods and equipment are generally used in the exploitation of heavy petroleum oil: screw pumps, electric heating hollow sucker rods and hollow rods mixed with water. These methods and equipment contribute to the exploitation of heavy oil in oilfields, but they also have their own shortcomings or shortcomings: ① The application and development of screw pumps have solved and developed the cold recovery of some low-viscosity heavy oil wells, but they cannot Meet the development of heavy oil and super heavy oil. ② The application of electric heating hollow sucker rods has made some progress in the technology of high pour point and high viscosity oil wells, but it still cannot meet the needs of oilfield develop...

AI Technical Summary

Problems solved by technology

These methods and equipment contribute to the exploitation of heavy oil in oilfields, but they also have their own shortcomings or shortcomings: ① The application and development of screw pumps have solved and developed the cold recovery of some low-viscosity heavy oil wells, but they cannot Meet the development of heavy oil and super heavy oil

② The application of electric heating hollow sucker rods has made some progress in the technology of high pour point and high viscosity oil wells, but it still cannot meet the needs of oilfield development, especially the production cost has increased significantly, so some low-yield oil wells have lost their investment due to high cost. If you don’t pay, you will consume a lot of energy. If each well is calculated as 800 meters, the daily power consumption will be more than 800KWh, and the daily power consumption cost will be more than 400 yuan.

③Hollow rod water-mixed heavy oil production technology, compared with electrothermal technology, reduces the production cost in a short period of time, but the hollow rod water production brings inaccurate oil well production measurement, increased crude oil water treatment workload, and sewage mixed into the pipeline. Problems such as poor working environment of the rods make the pipe rods prone to corrosion, scaling, clogging, increased eccentric wear, breakage, and increase the load of the production and transportation system, which will affect the normal production of oil wells in severe cases; The serious waste of resources and the deterioration of the working environment of the pipes and rods make the pipes and rods prone to corrosion, increased eccentric wear, breakage, and increase the load of the mining and transportation system; at the same time, once the leakage enters the formation, it will seriously pollute the formation. This affects the normal production of the oil well; secondly, due to the limited temperature rise of the water, the wellhead temperature generally does not exceed 60 degrees, and the rod will be blocked when the oil well is in production, and cannot go down normally, which is far from meeting the development needs of ultra-super heavy oil fields

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