长输管道工程
一、管道设计与选线 | Pipeline Design & Route Selection
二、管道施工 | Pipeline Construction
三、穿越工程 | Crossings
四、试压与投产 | Hydrotesting & Commissioning
HDD River Crossing — 36-Inch Gas Pipeline, Red River
Alright team, the Red River crossing at KP 218 is our critical path item. The river is 800 meters wide, 12 meters deep at the thalweg. We're using HDD with a 36-inch diameter, X70 grade gas pipeline. Stefan, where do we stand with the pilot hole?
好了团队，KP 218红河穿越是我们的关键路径项。河道宽800m、最深 处12m。用HDD、36英寸X70级输气管线。Stefan，导孔什么情况了？
The drill rig is a 500-ton capacity unit — more than adequate for this crossing. Entry angle is 12 degrees, exit angle 8 degrees. Total drill length including the curved sections is 1,260 meters. The pilot hole intersects three geological formations: stiff clay for the first 200 meters, then a 400-meter section of sand and gravel — that's the tricky part — and finally sandstone for the last 660 meters. We're using a mud motor with a jetting assembly for the clay, and switching to a roller cone bit for the sandstone.
钻机是500吨级——对这个穿越绰绰有余。入土角12°、出土角8°。含曲线 段总钻长1,260m。导孔穿越三层地质：前200m硬黏土、然后400m砂卵石层—— 那是最棘手的——最后660m砂岩。黏土段用泥浆马达加喷射组件、砂岩段 切换牙轮钻头。
The environmental permit conditions are strict. No drilling fluid can enter the river. We have a zero-discharge requirement. The drilling mud must be contained in the mud pits and recycled. And we need a turbidity monitoring buoy in the river — if turbidity goes above 10 NTU above background, we must stop and investigate.
环境许可条件很严格。钻井液不能进入河道。零排放要求。钻井泥浆必须 在泥浆池中容纳和循环使用。而且河里要放浊度监测浮标——如果浊度超过 背景值10 NTU、必须停工调查。
Understood. We've installed a containment berm around the entire entry-side site. The mud recycling system can handle 2,000 liters per minute. No fluid leaves this site.
明白。入土侧整个场地周围都设了围堰。泥浆循环系统处理量2,000升/分。 没有液体离开这个工地。
(two weeks later, after pilot hole completion)
（两周后，导孔完成后）
Pilot hole is complete and on target — the intersection with the exit point is within 0.6 meters, which is well within our 1.5-meter target tolerance. Now we ream: first pass to 24 inches, second to 36 inches, final to 48 inches — that's our target borehole diameter for a 36-inch pipe. We want a 1.33:1 borehole-to-pipe ratio to reduce pullback friction.
导孔完成且命中目标——与出土点交汇偏差0.6m、远在1.5m目标公差内。 现在扩孔：第一遍24英寸、第二遍36英寸、最后48英寸——这是36英寸管 的目标孔径。我们要1.33:1孔管比来减少回拖摩擦。
The pipeline string is fully welded and NDE-complete on the exit side — 900 meters of 36-inch X70 pipe. All girth welds passed AUT. The field joint coating is complete. The string is on rollers, ready for pullback. String weight is 540 tons on land, but buoyancy in the drilling mud will reduce the effective pull force during pullback to about 200 tons. Our rig can handle 350 tons continuous — we have plenty of margin.
出土侧管串已全部焊接NDE完成——900m 36英寸X70管线。全部环焊缝 AUT通过。补口完成。管串在滚轮上、准备回拖。管串陆地重量540吨、 但钻泥中的浮力会把回拖有效拉力降到约200吨。钻机连续拉力350吨—— 裕量充足。
Gas Pipeline Hydrotest — Section KP 180-260
James, we're here to witness the hydrostatic test for Section KP 180-260 — 80 kilometers of 36-inch gas transmission pipeline. The design pressure is 10 MPa, and per ASME B31.8 for a Class 3 location, the minimum test pressure is 1.25 times design — that's 12.5 MPa. Is the test section prepared?
James，我们来见证KP 180-260段水压试验——80km、36英寸输气管道。 设计压力10 MPa、按ASME B31.8三级地区最低试验压力1.25倍设计——即 12.5 MPa。试压段准备好了吗？
Yes, Fatima. Let me walk you through the preparation. The test section has been isolated with welded end caps at both ends. We've run a cleaning pig and a gauge pig through the section — the gauge pig passed without deformation, confirming there are no internal restrictions or dents. The section was filled with filtered potable water from the KP 180 end, venting at all high points and the KP 260 end. We've verified all air is removed — the vent valves are producing only solid water, no air bubbles. Water temperature is 18°C, well within the 5-38°C range that avoids thermal expansion complications.
是的，Fatima。我过一遍准备情况。试压段两端已用焊接封头隔离。 我们已经通了一个清管球和一个测径球——测径球无变形通过、确认无内部 限流或凹陷。从KP 180端注入经过滤的饮用水、在所有高点和KP 260端排气。 已确认空气排净——排气阀只有水柱、没有气泡。水温18°C、远在5-38°C 范围内、避免热膨胀复杂化。
We have two calibrated pressure gauges at each end — range 0-20 MPa, accuracy class 0.25, calibration certificates valid. We also have a deadweight tester connected for verification. Diego, let's begin the pressurization sequence.
两端各有两块校准压力表——量程0-20 MPa、精度0.25级、证书有效。 还有一台死重测试仪连接做核验。Diego、开始加压程序吧。
Starting the test pump. Pressurizing to 5 MPa for the initial check — holding 10 minutes. No leaks. Now to 10 MPa — holding 15 minutes. All flanges dry, all weld caps dry. Now to the full test pressure: 12.5 MPa. We've reached 12.5 MPa. Starting the 4-hour strength test hold period.
启动试压泵。加至5 MPa初检——保压10分钟。无泄漏。现在10 MPa—— 保压15分钟。全部法兰干、全部封头干。现在到全试验压力12.5 MPa。 已达到12.5 MPa。开始4小时强度试验保压期。
I'll log the pressure readings every 15 minutes.
我每15分钟记录压力读数。
T=0h: 12.50 MPa; T=1h: 12.49 MPa; T=2h: 12.48 MPa; T=3h: 12.48 MPa; T=4h: 12.47 MPa. Total pressure drop: 0.03 MPa — that's 0.24% of test pressure. Well within the 0.5% allowable. Strength test passed. Now the 24-hour leak test.
T=0h: 12.50; T=1h: 12.49; T=2h: 12.48; T=3h: 12.48; T=4h: 12.47。总压降0.03 MPa——试验压力的0.24%。远在0.5%允许值内。 强度试验通过。现在是24小时严密性试验。
(24 hours later)
（24小时后）
Final reading: 12.42 MPa. Total drop over 24 hours: 0.05 MPa — 0.4% of test pressure. No visible leaks on the entire 80-kilometer section during the 24-hour visual patrol. The deadweight tester confirms the gauge readings are accurate within 0.01 MPa.
最终读数：12.42 MPa。24小时总压降0.05 MPa——试验压力的0.4%。24小时 目视巡线、80公里全线无可见泄漏。死重测试仪确认压力表读数在0.01 MPa 内准确。
Section KP 180-260 hydrostatic test is accepted. James, Yuki, good work. I'll sign the test certificate. Please proceed with dewatering and drying per the procedure.
KP 180-260段水压试验验收。James、Yuki、干得好。我签试验证书。 请按规程继续排水和干燥。