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土耳其石油公司 (TPAO)在土耳其东南部的几个油田采用非混相CO2 驱提高重油采收率。由于这些油田所含重油的相对分子量很高 ,所以混相压力比油藏压力高得多。因此通过注CO2 提高原油采收率必须依赖非混相驱 ,在非混相驱中 ,CO2 溶入原油后 ,使油膨胀 ,并降低油的粘度。 1 986年在BatiRaman重油油田注非混相CO2 获得了成功。BatiBa man油田发现于 1 96 1年 ,所产原油为低重度 ( 1 2°API)、高粘 ( 6 0 0cP)原油 ,产层平均深度 1 30 0m ,原始石油地质储量为 1 . 85× 1 0 9STB (地面桶 )。产层是孔洞和裂缝性石灰岩 ,并具有平面和垂向不均质性。由于油藏能量低且原油性质不好 ,预计一次采油的最大采收率低于现有地下原油储量的 2 % ,开采 2 5年后 ,油田产量降至 1 5 0 0STB/d。注CO2 后 ,原油最高稳定产量达 1 2 0 0 0STB/d ,累计原油产量在 1 0年内翻了一番。由TPAO、JNOC和JEORA在Ikiztepe重油油田成功地完成了非混相CO2 现场试验 ,在一个2 0 0m× 2 0 0m的反五点井网应用CO2 非混相驱。该试验场的试验动态说明 ,CO2 非混相驱是提高这类油藏采收率的可行办法。在Amurlu重油油藏的几口井用蒸汽吞吐技术注了CO2 富气。观察到这几口井的产量增加了二到三倍。要成功地应用非混相CO2 ,必须根据每个油藏的特征
Turkish Oil Company (TPAO) uses non-miscible CO2 flooding in several fields in southeastern Turkey to boost heavy oil recovery. Due to the high relative molecular weight of the heavy oil contained in these fields, the miscible pressure is much higher than the reservoir pressure. Therefore, CO2 recovery through oil injection must rely on non-miscible flooding. In non-miscible flooding, CO2 dissolves in the crude oil and causes the oil to expand and reduce the viscosity of the oil. In 1986, a successful injection of non-miscible CO2 was noted in the Bati-Raman heavy oil field. The BatiBaman oilfield was discovered in 1961. The crude oil produced is low-gravity (120 ° C) and high-viscosity (600 cP) crude oil. The average depth of the formation is 1,300 meters. The original petroleum geological reserve is 1.85 × 1 0 9STB (ground barrels). The pay zones are vugs and fractured limestone with planar and vertical inhomogeneities. Due to the low energy of the reservoir and the poor nature of the crude oil, the maximum recovery rate of primary oil recovery is estimated to be less than 2% of the existing underground crude oil reserves. After 25 years of mining, the oilfield output has dropped to 15 0STB / d. After CO2 injection, the maximum steady output of crude oil reached 12 000 STB / d, and the cumulative crude oil output doubled in 10 years. A non-miscible CO2 field trial was successfully completed by the TPAO, JNOC and JEORA in the Ikiztepe heavy oil field. CO2 immiscible flooding was applied to a 200m × 200m anti-five-point well pattern. The experimental field test shows that CO2 immiscible flooding is a feasible way to improve the recovery of such reservoirs. Several wells in the Amurlu heavy oil reservoir were injected CO2 rich gas with steam stimulation. The production of these wells was observed to have increased two to three times. To successfully apply non-miscible CO2, it must be based on the characteristics of each reservoir