| When heavy oil thermal mining, the steam cycle of increasing throughput, increasing reservoir heterogeneity longitudinal plane of peace obvious, especially shallow super heavy because of the presence of high permeability zones and fractures, large pores, can easily a Steam appear uneven steam channeling between wells, even surface steam channeling and other issues, with the further lowering of steam injection sweep efficiency, making the development effect of thermal recovery severely affected.By comparing the thermal recovery of heavy oil fields for anti-steam channeling water shutoff profile related measures, combined with heavy oil field data well area 32 heavy oil reservoir area and the actual situation, we use a three-phase bubble temperature profile control system carried out in the area profile, and to carry out targeted high-temperature three-phase foam technology research profile.Three-phase component of the high temperature profile control agent foam system comprising:a polymer gel, solid particles, surfactants. By achieving the purpose of the three-phase foam system cleanup profile in the reservoir, the main mechanism of action is as follows: ① the polymer solution into solid particles first high permeability reservoirs, can block steam channeling some extent channel; ② the polymer solution may be at a certain temperature the formation to form a gel, so that the sealing ability to enhance the system to further improve the sealing effect; ③ When the steam injection time increases, the formation temperature is higher than 200 ℃, the polymer gel hydration system will occur, so that the high temperature surfactant released. Under the direction of the surfactant in the steam temperature, initiator and steam condensate multiple effects, can form a good foam system, resulting in a "Jamin effect" in the reservoir to achieve the effect of the second profile, so that steam changes;④ polymer gel system after hydration reaction by the release of surfactant, which can effectively avoid direct steam condensate and heavy oil produced water emulsions. Water-in-oil emulsion in the role of surfactant can significantly reduce the viscosity of heavy oil, and change the reservoir fluid mobility, achieve the effect of viscosity reduction and cleanup. ⑤ In general, the three-phase bubble temperature profile control agent gel system in two to three cycles of steam stimulation hydration can slowly degrade, reducing the pollution of the reservoir.GPT-C final formula is:0.30% of APAM (relative molecular mass of 1600 to 20 million, the degree of hydrolysis of 23 to 30% solids content of> 88%, Shengli Oilfield Fangyuan Chemical Company),0.40% formaldehyde cross-linking agent (content 37%, Panjin City Dawa Guangming Chemical Factory),0.03% of resorcinol, 0.25% of the heat stabilizer (AR,99.5%, Zhengzhou Henghua Chemical Co.),40% of urea (AR,99.0%, Beijing CommScope Victoria Department of Science and Technology Co., Ltd.),0.3 percent of high-temperature foaming agent G-2, and 4% of the solid particles ((fine rubber powder,180 to 270 mesh, Dongying City have helped rubber Co.), etc..Synthesis shows that the thermal stability of the temperature GPT-C≥160 ℃, the thermal stability of the gel system temperature≥160 ℃, plugging rate GPT-C of≥ 85%, plugging rate gel system≥95... |
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