中游油气工程
一、集输系统 | Gathering Systems
二、天然气处理 | Gas Processing
三、储运设施 | Storage & Transportation
四、管道完整性 | Pipeline Integrity
五、计量与交接 | Metering & Custody Transfer
Smart Pig Run — 30-Inch Crude Trunkline Integrity Assessment
Robert, we're launching the MFL smart pig on the 30-inch Eastern Crude trunkline — 245 kilometers from the CPF to the export terminal. This line has been in service for 22 years and this is its fifth ILI run. The last run four years ago showed moderate internal corrosion at three locations. I need to know if those features have grown and if we have any new ones.
Robert，我们要在东部原油干线发射MFL智能清管器——从中心处理站到 外输终端245公里。这条线服役22年了、这是第五次内检测。四年前上次 检测显示三处中等内腐蚀。我需要知道那些缺陷有没有增长、有没有新的。
The pig is configured with MFL sensors for metal loss, a caliper arm for geometry/dents, and an IMU (Inertial Measurement Unit) for XYZ mapping. This gives us a complete picture — metal loss, dents, and the exact GPS coordinates of every feature. Anna, is the pig loaded?
清管器配置了金属损失MFL传感器、几何/凹陷测量臂、还有惯性测绘单元 做XYZ定位。这给我们完整图像——金属损失、凹陷、以及每个特征点的精确 GPS坐标。Anna，清管器装好了？
Loaded and ready in the launcher. The line is running at steady state — 350,000 BPD, pump discharge pressure 850 psi. Expected pig speed: 4-6 km/h. Total transit time: 40-60 hours. We have tracking crews at KP 80, KP 160, and KP 240. The receiver team will be on standby at the terminal starting at hour 38. Launching now.
装好了在发射筒里。管线稳态运行——35万桶/天、泵出口850 psi。 预计清管器速度4-6 km/h。总通过时间40-60小时。KP 80、160、240有 跟踪队。接收队从第38小时起在终端待命。现在发射。
(60 hours later, data analysis room)
（60小时后，数据分析室）
Dr. Okafor: The raw data is downloaded. Initial analysis: the pig detected 2,847 metal loss features. But 95% are superficial — less than 10% wall loss, classified as "monitor only." There are 12 features with wall loss between 20-30%, and three with wall loss exceeding 30%. The three from the previous run — at KP 72, KP 143, and KP 198 — have all grown. KP 72 went from 22% to 31% wall loss in 4 years. That's a growth rate of 2.25% per year. At that rate, it hits the 40% repair threshold in 4 more years.
原始数据下载完毕。初步分析：清管器检测到2,847处金属损失特征。但 95%是浅表的——减薄不到10%、归类"仅监控"。有12处减薄20-30%、还有 三处减薄超过30%。上次检测的三处——KP 72、143、198——都增长了。KP 72 四年从22%长到31%减薄。年增长速率2.25%。按这个速率，4年后到40%修复 阈值。
KP 72 — that's the low-point section where water accumulates. The internal corrosion is from water dropout. Mark, my recommendation: we install a corrosion inhibitor injection point upstream of KP 72, increase the pigging frequency from annual to quarterly, and schedule a repair sleeve for KP 72 in the next planned shutdown. The other two can be monitored with a re-inspection in 3 years.
KP 72——那是水积聚的低点段。内腐蚀是水析出造成的。Mark，我的建议： 在KP 72上游增设缓蚀剂注入点、通球频率从每年一次提高到每季度、 在下一个计划停输安排KP 72修复套筒。另外两处可以用3年后复检来监控。
TEG Dehydration Troubleshooting — Gas Plant Off-Spec Dew Point
Viktor，商品气水露点超标了。我们看到-5°C露点——管输要求在70 bar 交货压力下-10°C。TEG吸收塔一直在设计贫TEG循环量25 gpm、纯度99.95% 下运行。但脱水效果不够。出啥问题了？
Tomás: Viktor, the sales gas water dew point is off-spec. We're seeing -5°C dew point — the pipeline tariff requires -10°C at 70 bar delivery pressure. The TEG contactor has been running at the design lean TEG circulation rate of 25 gpm with 99.95% purity. But we're not getting the dehydration we need. What's going on? Let me check the TEG analysis results from the lab. Grace, do you have the latest lean TEG sample?
我查实验室的TEG分析结果。Grace，有最新贫TEG样品吗？
Yes, pulled yesterday. The TEG purity is showing 99.93% — that's fine. But here's the problem: the pH is 4.8. Healthy TEG should be pH 6.5 to 7.5. The low pH means the TEG has become acidic — it's thermally degrading. And look at the iron content — 45 ppm. Normal is under 10 ppm. The acidic TEG is corroding the carbon steel piping and the iron is acting as a catalyst, accelerating further degradation. It's a vicious cycle. The degraded TEG has lost its absorption capacity even though the purity reading says 99.93%.
是的，昨天取的。TEG纯度99.93%——没问题。但问题在这：pH值4.8。 健康的TEG应该pH 6.5-7.5。低pH说明TEG变酸了——在热降解。再看铁含量—— 45 ppm。正常应低于10 ppm。酸性TEG在腐蚀碳钢管线、铁又作为催化剂 加速进一步降解。恶性循环。虽然纯度读数99.93%但降解了的TEG已经失去 吸收能力了。
That explains it. The TEG reboiler temperature has been running at 205°C — that's too hot. Above 204°C, TEG starts to thermally decompose. Someone pushed the reboiler temperature up trying to get better purity, but they actually caused the degradation. Tomás, we need to: one — reduce the reboiler temperature to 195°C immediately. Two — add a TEG pH buffer to the system to neutralize the acids. Three — replace 50% of the TEG inventory with fresh TEG to dilute the degraded fluid. And four — schedule a carbon filter change — the carbon bed is supposed to remove the degradation products and it's probably saturated.
这解释一切了。TEG重沸器温度一直在205°C运行——太高了。超过204°C、 TEG开始热分解。有人为追求更高纯度把重沸器温度推高了、结果反而造成 降解。Tomás，需要：一——立即把重沸器温度降到195°C。二——往系统 加TEG pH缓冲剂中和酸。三——更换50% TEG存量、用新鲜TEG稀释降解液。 四——安排换活性炭过滤器——活性炭床应该去除降解产物、可能已经饱和了。