Research On The Assemble Cyclic Steam Stimulation Injection Of Ultra-heavy Oil

The resource of ultra- heavy oil reserves in the Shu Yi district in Liao He oil field is rich. The oil area covers 22.4 km2 and the proven oil reserves reach 15294×10⁴t. The Du 84 and Du 229 are the main ultra- heavy oil blocks in the Shu Yi district, which are put into cyclic steam stimulation exploitation separately and gain the comparatively good production effect, are the important blocks for the Liao He oil field to increase reserves and output. But at the moment the problems of high cyclic steam stimulation and gradually worse exploiting effect exist currently. The single steam injection mode has not adapted to the gradually expanding production scale and increasingly complex and severe exploitation status.By concluding the huff-puff rule of laboratory cluster well and analyzing the exploitation contradiction, this text will make research and conclusion on the technology of further improving the cyclic steam stimulation benefit of ultra- heavy oil, and realize the organic integration of output and cost particularly from optimizing the combined steam injection and its parameters. On the base of ordinary cyclic steam stimulation of ultra- heavy oil, purposely adopt the exploitation methods including combined steam injection, that is recovery interval, integrated steam injection, one - well Injection and Steam- sur factant - CO₂ stimulation, etc which gains the comparatively good huff-puff effects, improves the recovery factor of cluster well, and offer the exploitation mode for the whole oil field exploitation which is worth learning.In the combined huff-puff technology, will particularly analyze the Steam- sur factant - CO₂ stimulation technology, in which, particularly make research on the ration of dissolve of CO₂ in the oily water, the phase change of CO₂when it is injected into the oil well and energy consumption situation and the change rule of Viscosity after CO₂ is dissolved under different temperatures and pressures. According to the geological characteristics of oil pool in the Du 84 and Du 32 block, build up the laboratory physical model in accordance with the porosity and permeability of oil pool in the Du 84 block, complete the laboratory research on the influence of factors including steam injection volume, CO₂ injection volume, concentration of surfactant molecules, gas and spraying velocity on the huff-puff effect, and the experiment of optimized appraisal to four additives, and so on.Keywords:ultra- heavy oil,assemble steam injection,integrated steam injection,one - well injection and multi - well production,Steam- sur factant - CO₂ stimulation...