Digital Separated-Zone Water Injection Technologies with Cable-PresetDownhole Flexible Composite Pipe
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摘要:
低渗透油田分注管柱长期服役后腐蚀结垢严重、分层注水合格率下降快。为此，设计了井下柔性复合管预置电缆数字式分注工艺管柱，研发了智能配水器与过电缆封隔器等关键工具，开展了管柱抗外压、抗拉强度等关键性能室内评价，形成了适用于井下高压条件下的柔性复合管分层注水技术。室内评价结果表明，管柱满足分注井封隔器坐封压力与最大抗外压要求，智能配水器流量测试误差小于2%。现场试验4口井，最长服役时间已超过2年，分层注水合格率100%。研究表明，预置电缆数字式分注技术应用柔性复合管，可以有效提升管柱耐腐蚀性能，实现分层流量自动测调、远程验封和数据监测等功能，满足封隔器坐封、反洗井及后期测试要求，具有较好的应用效果。
Abstract:Separated-zone water injection string in low-permeability oilfields is challenged by various problems after a long time in service, e.g. severe corrosion, scaling, and rapid decrease of separated-zone water injection conformity rate. To solve these problems, a digital separated-zone water injection string with a technology of cable-preset downhole flexible composite pipes was designed. The key tools, i.e. an intelligent water distributor and a cable-penetrated packer, were developed. Further, the key performances, including external pressure resistance and tensile strength, of the string were evaluated in laboratory. Separated-zone water injection technologies with flexible composite pipes suitable to downhole high-pressure were thereby developed. The laboratory evaluation results demonstrated that the developed string met the requirements on the packer setting pressure in separated-zone water injectors and the maximum external pressure resistance. The measurement error of the intelligent water distributor flow rate was below 2%. Field tests were carried out in four wells. The maximum service time was over 2 years, and the conformity rate of separated-zone water injection was 100%. This study indicates that the application of flexible composite pipes in cable preset digital separated-zone water injection technologies can effectively improve corrosion resistance, achieve automatic measurement and adjustment of separated-zone flow, remote sealing verification, and data monitoring, meet the requirements of packer setting, reverse circulation, and subsequent tests, all of which showcase promising application effects.
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图 6 增强层各层纤维纵向应力变化
Figure 6. Vertical stress change in each layer of fiber at reinforcement layer
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图 7 增强层各层纤维横向应力变化
Figure 7. Horizontal stress change in each layer of fiber at reinforcement layer
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图 8 爆破压力测试值与模拟结果对比曲线
Figure 8. Comparison of results of burst pressure experiment with simulation results
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图 11 井下实际工况下伸长量变化曲线
Figure 11. Variation curves of elongation under actual downhole working conditions
表 1 现场试验井情况统计
Table 1 Situation statistics of field test wells
井号 完井时间 管柱长度/
m管柱伸
长量/m封隔器验
封情况上层配注量/
(m3∙d−1)上层注水量/
(m3∙d−1)上层水量误差，% 下层配注量/
(m3∙d−1)下层注水量/
(m3∙d−1)下层水量
误差，%Q93-4 2019.10.21 1 841 1.6 合格 16 16.54 3.37 14 14.37 2.64 Q91-8 2019.10.29 1 837 1.9 合格 15 15.14 0.93 15 14.55 3.00 Q65-6 2019.11.15 1 859 2.4 合格 10 9.88 1.20 15 16.01 6.73 Q65-4 2020.07.25 1 781 1.7 合格 10 10.56 5.60 20 20.23 1.15 
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