Research On Gravity Drainage Auxiliary Horizontal Well Steam Flooding Of Heavy Oil

Liaohe deep, deep and big proportion of ultra deep heavy oil reservoirs, accounting for76%of the reserves of heavy oil, covering the geological reserves of6.4x108t. In a laterstage of steam stimulation but there is no mature and effective to improve oil recoverytechnology, the transformation development way faces enormous challenges. Gravitydrainage auxiliary steam drive technology in cold home oilfield depression59blocks tocarry out the pilot test, and achieved significant development effect, is likely to be a deepimprove recovery factor of heavy oil reservoir development technology; The technology hasthe obvious difference with the traditional steam flooding and SAGD. At present, thetechnology does not reach the designated position of form a complete set, seriously affectingthe popularization and application of this technology.Comprehensive indoor physical simulation experiment, this paper tracer test data, testwell group production dynamic characteristics change, use formula near wellbore flowcapability study analysis hollow block of59test area development of thermal recoveryeffect. Through the establishment of conceptual model, initialized based on the real reservoirconditions, after dynamic history matching, the gravity drainage auxiliary steam drive testwell group displacement law studies, respectively under different conditions, analysis of testwell group planar seepage field, different directions even well profile, quantitative analysisof the test well group the well production characteristics change and the correspondingrelationship of the distribution of underground seepage field. Based on the theoretical model,in combination with the practical situation of reservoir, calculation and analysis of differentinjection medium and injection rate on the wellbore temperature profile and the influence ofthe temperature distribution. Based on establishing the gravity drainage auxiliary steam drivemechanism research typical model, reservoir geological conditions in determining (based ondepression reservoir of59), conduct injection-production parameters study for optimizationdesign of gravity water auxiliary steam flooding, injection-production well pattern andinjection-production parameters, etc.