Research and Practice on Gas Channeling Controlling by Combined Stimulation for Multi-Thermal Fluids Huff and Puff

Kuiqian MA, Dong LIU


Cycle steam stimulation has been widely used in land oil field. In order to get higher oil recovery rate and higher cumulative oil production, one improvement work of cyclic steam stimulation is injection N2 and CO2 together with steam to enlarge the heated radius, and the pilot test of multi-thermal fluids huff and puff were carried out in offshore heavy oil in Bohai. There were 10 horizontal wells which have accomplished the 1st cycle stimulation, and 6 wells have accomplished the 2nd cycle stimulation. There were 4 well times of gas channeling in the 1st cycle injection, and 9 well times in the 2nd cycle injection. Because of the formation pressure drop, gas channeling became more serious with the increase of stimulation cycles. Based on the well performance, the reason and characteristic of gas channeling for injection multi-thermal fluids were analyzed, which is different from that of steam injection. Based on a numerical model, a quantitative researched about the influence of gas channel to thermal well was carried out. In order to manage the gas channeling, a combined stimulation program was purposed. Case study of gas channeling controlling by combined stimulation in N heavy oil field in Bohai shows that, the combined stimulation can relieve the risk of gas channeling. The new multi-thermal fluids injection model is of great significance for thermal recovery of offshore heavy oil.


Gas channeling; Combined stimulation; Multi-thermal fluids; Offshore heavy oil

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