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Application of coaxial double hollow sucker rod in heavy oil well in Gudao Oilfield of Shengli oilfield"2017-11-16 14:23:27 6531 views Author：管理员 Can the continuous well run above 800 Yu Tian in the cold production condition of the viscous oil well with a viscosity of more than 7000 MPa? The answer is yes, Shengli oil field Gudao oil production plant GDNB76X77 well has done! Not only that, during the operation, Nissan oil has remained at about 9 tons, accumulated oil production of more than 7800 tons.
Such a success, thanks to a new set of equipment installed in GDNB76X77 well - Coaxial double hollow sucker rod closed cycle heating device.
In the GDNB76X77 well production site, the reporter saw the device. The coaxial double hollow sucker rod is an independent hollow channel designed in the cavity of an ordinary hollow sucker rod. It is connected with two channels by a special bottom terminal to form a closed loop system which is completely isolated from the annular space of the rod and tube.
In the process of oil production, the water recycling ground heat exchanger, the pressurized circulating pump, buffer tank buffer, inside the hollow channel into the coaxial hollow rod, double flow to the tail end of the hollow rod, and then enter the annular channel, return to the ground to the heating furnace heating cycle again.
In the process of running up and down the sucker rod, the heat passes through the hollow rod to the crude oil in the annular space, which achieves the purpose of heating and reducing viscosity, increases the fluidity of the crude oil, and ensures the normal production of the oil well. In the whole process, because the circulating water does not enter the shaft, it is convenient to measure the output of the oil well.
Because the internal heat insulation pipe adopts stainless steel material and double layer insulation layer, the heat loss is effectively reduced, and the heat efficiency is improved. After on-site measurement, the temperature of the circulating water can be kept at about 50 degrees Celsius after returning from the bottom of the well.
The combustion medium of the device is natural gas or coal, with sufficient fuel and low cost. According to statistics, the only power consumption equipment in the device pressurized pump, the daily electricity consumption is only 60 kwh, compared with the "electric heating rod" viscosity reduction mode, saving electricity significantly.
In addition, due to the internal heat pipe using piecewise threaded connection mode, when the oil pipe sucker rod oil accidentally enter the annular space, can separate the cleaning and replacement of single segment heat pipe and the hollow rod, solves the mining because of heavy oil block, Guan Shouzu, pull off phenomenon occurred insulation. In addition, when the heat insulation pipe is damaged somewhere, it is only necessary to replace the segment of the heat insulation pipe individually, and the whole waste is not needed.
In the GDNB76X77 test wells based on the successful installation and operation, in 2012, the coaxial hollow rod closed loop heating device installed in the "island factory and 5 heavy oil wells, has all the normal operation of the exemption period of the longest has reached 390 days, the average daily oil in more than 7 tons, containing water keep in 70%.
The upper cycle production of B76P203 well is only 435 tons in the solitary four area. After the installation of "coaxial double hollow sucker rod closed cycle heating device", the cycle period is obviously prolonged. As of now, the production has reached 1164 tons. Previously, the heavy oil showed heavy load, production difficulties, wellhead oil leakage and other phenomena, but also improved to some extent.
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