The most popular Tahe innovative large displacemen

2022-08-02
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Tahe's innovative large displacement thickening pump technology has won the national patent

Tahe oilfield oil production plant 2 is a fracture cave type carbonate heavy oil reservoir, which has the characteristics of "two ultra high and five high" with ultra deep, ultra thick, high density, high viscosity, high colloidal asphaltene, high hydrogen sulfide and high salinity. The viscosity of crude oil at 50 ℃ is × 104mPa. s. The depth of crude oil viscosity temperature inflection point is m

the second oil production plant of Tahe oilfield is a fracture vuggy carbonate heavy oil reservoir, which has the characteristics of "two super and five high" with ultra deep, ultra thick, high density, high viscosity, high colloidal asphaltene, high hydrogen sulfide and high salinity. The viscosity of crude oil at 50 ℃ is × 104mPa. s. The depth of crude oil viscosity temperature inflection point is m. At present, the heavy oil recovery of the plant mainly adopts the oil production process of mixing thin oil to reduce viscosity

there are "shortcomings" in the mechanical lifting method.

the oil production process adopted by the plant is mixed with thin oil to reduce viscosity. Two requirements are put forward for the selection of the mechanical lifting method: first, the pump depth can meet the requirements for heavy oil pumping; Second, large discharge capacity can meet the requirements of pump discharge capacity for dilute production. At present, the main mechanical lifting methods used in the plant are conventional hydraulic feedback heavy oil pump and anti heavy oil submersible pump. However, there are "shortcomings" in the production management of these two processes: first, the conventional heavy oil pump has a small displacement, which is difficult to meet the lifting needs of heavy oil wells with high dilute to thick ratio. Conventional cyb-70/44 heavy oil pump, with pump efficiency of 80% and working system of 5m × Based on the calculation of 4n/min and 2.0 dilution consistency ratio, cyb-70/44 thick oil pump can only meet the production of oil wells with formation liquid production less than 18 m3, and can not meet the liquid extraction requirements of ultra thick oil wells; Second, the average service life of electric submersible pump in super heavy oil block of Tahe oilfield is only 170 days, resulting in extremely high production cost due to the influence of factors such as heavy oil, deep viscosity temperature inflection point, poor mixing effect of thin and heavy oil, and the difficulty of improving the adaptability of electric submersible pump unit in the market

carry out project establishment and tackling key problems for the "short board"

to effectively solve the problems of small displacement of conventional heavy oil pump, which is difficult to meet the lifting requirements of heavy oil wells with high dilute to thick ratio, and high production cost caused by heavy oil, deep viscosity temperature inflection point, poor mixing effect of thin and heavy oil, poor adaptability of heavy oil of electric pump unit and short average operation life. The technical personnel of the plant have successfully developed a large displacement thickening pump suitable for ultra heavy oil block after No. 1 exploration and innovation of removing the grounding wire in the power cable experiment, and achieved good application results, laying a solid foundation for the oil production plant to increase storage and production. At the same time, through repeated analysis and research, the technicians have made a series of improvements on the plunger cross-sectional area, pump barrel length, oil inlet channel, pump clearance and pump barrel tensile strength on the original basis in view of the problems of the conventional 70/44 heavy oil pump with high lag rate and difficult displacement to meet the production needs of high diluted oil wells, It has successfully developed 70/32 and 83/4, and the government has allocated 10million yen to Bayer Material Science and technology 4 type lateral oil inlet large displacement thickening pump

in addition, the technicians also carried out research and innovative research on the matching process of large displacement thickening pump. First, deepen the separation design under the pump; According to the idea of separate design of mixing point and pump hook, the mixing effect of thin and heavy oil is improved. By increasing the tensile strength of pump barrel of thick oil pump, the tail pipe is deepened, so as to improve the mixing effect of thin and heavy oil, reduce the amount of thin oil, and further expand the application range in heavy oil block; The second is to test the large clearance pump; On the basis of large displacement pump, the pump clearance is improved from grade 5 to grade 8, the friction between pump barrel and plunger is reduced by 44%, which effectively reduces the downward resistance, improves the stress condition of rod column, and reduces the rod column breaking and lag rate. At present, it has been applied in well th12253x and AD16, and the abnormal rate of test pumping has decreased significantly after the test, which has greatly improved the adaptability of large displacement heavy oil pump in ultra heavy oil block

miraculous effect in solving difficult problems

since last June, the innovative technology has been tested in five wells, including t738 and th12107. The average oil production of a single well has been increased by 4.9t/d, and the theoretical displacement has been increased by 22m/d. The production effect during the test period is good. Through the initial experiment, it is proved that the large displacement thickening pump can be applied to most of the heavy oil wells in zone 12, laying a foundation for the large-scale promotion and application in the later stage. Up to now, the large displacement thickening pump in the plant has been used for 103 well times, replacing the electric pump for 30 well times, with an average pump depth of 2480 meters, an average theoretical displacement of 80 cubic meters, a daily increase of 364 tons, and a cumulative increase of 1056600 tons of oil, basically replacing the production of cubic meters of electric pump. Among them, the tail pipe has been used for 40 well times, which has saved 35200 tons of thin oil to make the water in the carton reach the dynamic equilibrium state, and achieved good results, creating a cumulative economic benefit of 408million yuan. At present, this innovative technology has fully adapted to the mechanical lifting requirements of extra heavy oil wells in zone 12. Through the comparison of similar technologies in the development of ultra heavy oil at home and abroad and the economic benefits obtained, it is proved that the heavy oil pumping pump developed by the plant has reached the leading level in the heavy oil lifting technology at home and abroad, and has a good promotion prospect. It is reported that the technological innovation achievements have obtained national patents

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