Hollow Circulation Pump Process Technology
1, Introduction Owned Sinopec Northwest Branch River on the sixth block oil is heavy oil, which is difficult to make use of reserves, particularly the northwest block of the most typical, an oil viscosity of crude oil have been bigger than 10000mPa S (50 ), As the borehole movement friction loss large oil can’t only depend on the formation vitality flow to the wellhead. Early in the block for temperature-delicate properties of crude oil, have examined the heating cable, heating pipes, heat pumps over different objects of thermal restoration technology, which S711 wells (70 oil viscosity 34593mPa S) reached the maximum heating power of 310kW, TK6051 Wells (50 oil viscosity 24500mPa s) reached the utmost heating power 130kW, well nonetheless not been in a position to type a manufacturing capacity.
Thermal recovery know-how on the summary analysis to find out the thermal restoration techniques laborious to use reserves within the north-west block of the failure was due to the block buried at a big (greater than 5500m deep reservoir ), low temperature gradient (one hundred m temperature gradient 2.2 ), heat loss huge shaft, whereas decrease oil manufacturing, oil production is tough to form a stable temperature.
Finish of the block situated in the mining course of mixing light oil viscosity on oil restoration technology, the technology may scale back the wellbore fluid density and viscosity, so as to solve large wellbore stream friction loss issues. April 2005, the TK6051 wells were doped skinny composite hollow circulation pumps lifting process pilot test, to properly over a 12 months-long suspension of the effectively obtained 18t / d of stable manufacturing for the next step the block oil extraction expertise offered the premise for matching, the know-how has good prospects.
2, the essential traits of reservoir and fluid
River on the 6th of Ordovician oil reservoir lure type unconformity karst fracture hole traps. Strong heterogeneity of the reservoir, the vertical cracks within the reservoir typically as being a direct communication or communication related part maze of native lithology and by the tight control of filling the role of the existence of closed oil or water reservoir system. Vertical distribution of oil and gasoline primarily in the karst holes, holes, Sutures, confirmed a continuous distribution, that is, don’t clip the center layer of water. Reservoir – Earlier than formation strain 61.81MPa/5664m, the stress coefficient of 1.09, a traditional pressure system; reservoir formation temperature is 129.Four / 5664m, the typical temperature gradient of two.2 / 100m, is a low temperature system.
River northwest of laborious to make use of oil reserves on the 6th block affected by the structural characteristics, – Oil is heavy and extra heavy oil mainly. For example, at 50 ,
60 , 70 and eighty for, S711 viscosity of crude oil wells have been 320000mPa S, 112776mPa S, 34593mPa S and 12357mPa S; S741 temperatures effectively above the viscosity of crude oil have been 8389mPa s, 3699mPa s, 1380mPa s and 900mPa s; S661 viscosity of crude oil wells were 15997mPa s6799mPa s, 2759mPa s and 1620mPa s; TK4331 viscosity of crude oil wells have been 16097mPa s, 6499mPa s, 2819mPa s and 1860mPa s; TK6051 viscosity of crude oil wells, respectively 24500mPa s, 6800mPa s, 3100mPa s and 1520mPa s.
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