涩北气田泡沫排水采气效果下降原因分析及对策

Analysis and countermeasures on decline of gas recovery with foam drainage in Sebei Gas Field

贾敏 郭东红 李隽 曹光强 王浩宇 廖丽

JIA Min GUO Donghong LI Jun CAO Guangqiang WANG Haoyu LIAO Li

中国石油勘探开发研究院 中国石油集团采油采气重点实验室 中国石油青海油田分公司钻采工艺研究院

Research Institute of Exploration and Development, PetroChina, Beijing 100083, China Key Laboratory of Oil and Gas Production, PetroChina, Beijing 100083, China Research Institute of Drilling and Production Technology, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, Gansu, China

为了探究涩北气田泡沫排水采气措施效果下降的原因，开展了效果跟踪分析，采用泡沫排水采气效果模糊定量评价方法，计算出泡沫排水采气综合评价指数，进而确定选井指标界限为产气量大于0.3×10⁴ m³/d、产水量2~20 m³/d、油套压差0.8~3 MPa。然而现场泡排井生产参数大多数不在上述指标范围，所以选井的不合理是造成泡排效果下降的重要原因；同时，通过对现场泡排剂与高矿化度储层适应性分析，发现不适宜的泡排剂是造成泡排效果下降的另一原因。按照选井技术指标界限，并采用耐高矿化度纳米粒子泡排剂，选取15口气井开展泡排现场试验，气井产气量、产水量分别平均提高了9%和31%、油套压差平均降低了4%，表明合理选井和选用适宜泡排剂可以有效改善涩北气田泡沫排水采气效果，为该区块后续开发提供了技术支撑。

In order to explore the reasons for the decline in the effect of gas recovery with foam drainage measures in Sebei Gasfield, the tracking analysis on gas recovery effect was carried out. By using quantitative evaluation method on gas recovery effect with foam drainage, the comprehensive evaluation index on gas recovery with foam drainage was calculated, and then the index limits for well selection were determined as gas production greater than 0.3×10 m/d, water production ranging from 2 to 20 m/d, and oil tube-casing pressure difference falling between 0.8 and 3 MPa. Most of the production parameters of on-site foam drainage wells are not within the above-mentioned index range, so the unreasonable well selection is an important reason for the decline of foam drainage effect. Furthermore, through the analysis on the adaptability between the on-site foam drainage agent and the high-salinity reservoirs, it was found that unsuitable foam drainage agent is another reason for the decline of foam drainage effect. According to the technical index limits for well selection, and by using high-salinity-resistance nano-particle foam drainage agent, 15 gas wells were selected to carry out field tests of foam drainage. As a result, the gas production and water production of these gas wells increased by an average of 9% and 31% respectively, and the pressure difference between the oil tube and casing decreased by an average of 4%. It is shown that reasonable well selection and selection of suitable foam drainage agent can effectively improve the foam drainage effect of Sebei Gasfield, providing technical support for the subsequent development of this block.

10.13639/j.odpt.2022.04.012