Application Research Of High Dryness Steam Injection Technology In The Development Of SAGD Standard

Shuyi District of Liaohe oil field, Guantao oil reservoir in Du84block in Xinglongtai for super heavy oil reservoir.In1997the steam stimulation development, at present scale of production remained at1200000tons, becoming China’s largest heavy oil production base.Due to the limitation of cyclic steam stimulation and crude oil properties, well into the later high cycle huff and puff, periodic oil production declined gradually, stimulation effect is obvious variation, tons of oil costs continue to rise.Since2006in Guantao oil reservoirs of Du84block has exploitation pattern conversion, scale implementation of SAGD development, and achieved good results, the single well production of up to100-120tons/day.This paper is the first reservoir geological characteristics of Du84block, a rolling development process analysis, using reservoir engineering methods, combined with the actual production of super heavy oil, extra-heavy oil reservoir steam stimulation characteristics and rules, drawn to the high steam stimulation development period of Guantao oil reservoirs of Du84block is one of development be imperative mode, combined with the different ways of the ultra heavy oil development at present, that the SAGD development model is the most suitable, is the most effective.Principle and characteristics for the SAGD development mode, in the normal development process needs by pumping steam to the upper part of the straight hole, so that steam cavity continuous formation in oil reservoir, steam condensation heat heating oil. and then the heated crude oil and condensate to rely on gravity flows into the lower horizontal production wells are large capacity recovery.Heat oil in steam injection is effective only latent heat of vaporization enthalpy of saturated water use. not only for the production no contribution, but also affect oil well production effect, therefore to oil injection steam quality is high, the latent heat of vaporization of the release of more, and can greatly improve the recovery effect.The oil used in steam injection device for steam injection boiler (also known as wet steam generator), it is the high voltage direct current control mode, the oil or natural gas as fuel for heating cold water to produce high temperature high pressure wet steam.But due to the influence of water quality and its design, the outlet of the boiler steam dryness control in general75-80%.In order to improve the steam injection in the development of SAGD dryness, install and use the ball separator at the outlet of steam boiler, the steam quality is improved by more than95%by a steam-water separation.With SAGD development of Shul area has gradually centralized steam injection, steam single well dry degree distribution and measurement is the key technology.In order to solve this problem, according to the steam, water two phase flow through the pressure drop of the standard orifice, a Venturi tube, to establish the mathematical model, design and development of the dry steam distribution metering device, using this device can realize the dry steam distribution and measurement of each steam injection well, so as to realize the steam injection dry on-line monitoring and effective control of single well gas injection speed of.