Classic Case
Classic Case
On October 29, as the Duokouhe Purification Plant successfully began operations, our company smoothly completed the helium-nitrogen pressure testing and leak detection integrated construction work for the purification facility at the Duokouhe Purification Plant, a key component of the capacity-building project aimed at developing the Feixianquan Formation gas reservoir in the Duokouhe-Qili North Gas Field within the Sichuan Basin.
On September 18, 2024, our company was entrusted with the critical task of full-system drying, purging, and leak detection for Phase I of the Longkou Nanshan LNG Receiving Station project—the key component of the National Pipeline Network's Bohai Sea Strategic Initiative.
Facing the challenging operating conditions of the high-sulfur-containing units at the Chuanbei Northeast Operations Branch, along with extreme 40°C temperatures, our company has strategically coordinated personnel, equipment, and liquid nitrogen resources. By leveraging lessons learned from similar projects through tabletop simulations, we organized comprehensive, company-wide training sessions on specialized topics such as hydrogen sulfide protection, the SABA system, and the five-in-one detection device. This ensured that all employees received thorough "personnel-equipment-environment" three-dimensional safety briefings.
On March 30, 2024, following an urgent task assigned by the Pipeline Bureau of CNPC, our company promptly assembled a dedicated team along with specialized equipment and dispatched them to the site. At 1:00 PM on March 31, under the supervision of the client, we successfully initiated the first replacement operation—achieving pipeline hot-work connection readiness in just two hours.
On March 20 at 1:00 PM, we received an urgent notification from the Southwest Oil & Gas Field: the gas pipeline connecting Lianshan Station to Huixing Valve Chamber had been damaged by a third party.
On November 20, 2023, our company received an urgent notification from Chengdu Natural Gas Chemical Plant, requesting that we arrive at the Erlongkou Pigging Station in Luzhou within 24 hours (by 6:00 PM on November 21) to carry out gas shutdown and connection work on the Luwei Pipeline, followed by nitrogen purging to resume production.
August 6, 2023: Sichuan Northeast Helium-Nitrogen Pressure Testing and Leak Detection Joint Project
The project spanned 42 days, achieving a 17% efficiency boost compared to similar projects. It successfully completed the full-system pressure testing and leak detection at the Xuanhan Purification Plant—all while maintaining zero accidents and zero delays. Recognized by the client for its innovative technology and lean management practices, the project earned a special commendation, setting a new industry benchmark for the safe commissioning of high-sulfur gas fields.
On April 18, 2023, our company promptly responded to the deployment by the Southwest Pipeline Company of the National Pipeline Network, taking on the critical task of providing nitrogen support for the crucial pipe replacement and repair at the defective weld joint located at K180+765m along the China-Myanmar pipeline (Longling County, Baoshan, Yunnan Province). Facing the highly challenging operation of replacing 31.12 kilometers of D1016 pipeline, our team completed the advance preparation—deploying pump trucks, tank trucks, and assembling a top-notch crew—at Valve Station No. 7 three days ahead of schedule (April 16, 19:00). The company’s Safety Director and technical leaders personally led the effort from the front lines. From 21:13 on April 18 to 00:15 on April 19, we efficiently executed the first pipeline replacement; then, on April 21 from 09:05 to 11:36, we meticulously carried out the second replacement phase. Throughout the entire process, we rigorously adhered to the hot-work safety plan, delivering exceptional performance marked by "zero delays and zero incidents," which earned high praise from the National Pipeline Network and reinforced the secure flow of energy along the vital China-Myanmar energy artery.
On March 20, 2023, our company undertook the critical task of nitrogen purging for the pipe replacement project targeting a circumferential weld crack defect at the K797+807m section of the Zhonggui Pipeline.
On February 24, 2023, our company undertook the nitrogen displacement project for the D1219mm high-pressure pipeline—designed for a pressure of 12 MPa and capable of transporting 100 million cubic meters of gas daily—connecting the Desheng Valve Station to the Yongchuan Gas Transmission Station along the main route of the Weijiang Line in the Southwest Oil & Gas Field.
In October 2022, our company was urgently assigned the critical task of conducting nitrogen pressure testing, purging, and hot-work supervision for the newly constructed branch pipeline connecting to the Nanjing West Gas Transmission Station.
In October 2022, our company undertook the core node—nitrogen displacement technical services—for the pilot production mainline project at the Anyue Purification Plant Gas Gathering Station, a key component of the gas extraction management office's Pengtan Well Area No. 1 in northern and central Sichuan.
August 11, 2022: Yuanba First Station Metering Upgrade Project – Nitrogen Purging Project
This project is located at the nitrogen injection point in Yuanba First Station. The scope of work primarily includes a tie-in pipeline with specifications of D1016 mm × 22 km, as well as the Yuanlang Pipeline, which measures D406 mm × 34 km.
July 14, 2022: Weiqing Line Pressurized Nitrogen Replacement Project
This project is located at the Chengdu Gas Transmission Station of the Gas Transmission Management Division, Southwest Oil & Gas Field Company, featuring a pipeline with specifications of D720 mm × 39 km and operating under a natural gas pressure of 0.9 MPa.
On June 14, our company precisely carried out the nitrogen purging of the newly constructed D610mm pipeline (total length: 42 km) connecting Chongqing Nanchuan Dayou Gas Distribution Station to Dongsheng Gas Distribution Station, in preparation for its commissioning.
In this southern construction project, according to the work schedule of the Chongqing Oil and Gas Transmission Branch of Southwest Pipeline, three Class-I hot work operations along the Zhonggui Line are planned to be carried out consecutively from May 6 to May 10. Our company has been invited to perform nitrogen purging on the pipelines involved in these three hot work activities.
May 6, 2022 – Yeshan Guan Compressor Station Pipeline Nitrogen Purging Project
After receiving the Level-1 hot work notification on April 25, our company proactively deployed liquid nitrogen equipment ahead of schedule—despite the significant challenge of nationwide restrictions on hazardous chemical vehicles during the May Day holiday—to ensure project deadlines were met by moving in to the site on April 29.
During the "May Day" holiday period, to ensure the timely commissioning in June of Zhejiang Zhoushan LNG Receiving Station Phase II— a key national energy project—weeding out critical infrastructure—the construction team from our company gave up their vacation and is working tirelessly to complete the critical tasks of purging, drying, and purging the process pipeline system.
On September 10, 2020, our company was assigned the critical task of ensuring nitrogen safety during an emergency pipeline replacement and connection project targeting eight defective welds along the Guizhou section of the China-Myanmar natural gas pipeline. Upon receiving the assignment, we swiftly mobilized resources, completing the deployment of our engineering command vehicle, liquid nitrogen equipment, and a 14-member construction team by 5:00 PM on September 12. The team arrived promptly at the site—Valve Station No. 50—as scheduled.
This construction is expected to complete the pipeline interconnection and jointing on May 29, 2020, followed by nitrogen purging on May 30, 2020.
At a critical stage where our company is simultaneously tackling both epidemic prevention and control as well as resuming production and work, we have been entrusted with the nitrogen displacement technical service for tank inspection of two 5,000 m³ spherical tanks at Chengdu Gas Group's Third Storage and Distribution Station.
May 27, 2020: Hot Work Connection and Nitrogen Purging Project for the Zhonggui Natural Gas Pipeline
During the inspection of weld joints on the Zhonggui Natural Gas Pipeline, the Lanzhou-Chengdu-Yuanyang Oil Transportation Branch identified hazardous defects—specifically, weld cracks. To eliminate the significant safety risks these defective welds posed to pipeline operations, Southwest Pipeline Company organized a project to replace the affected sections of the pipeline by cutting out and replacing the compromised welds with new pipe segments.
October 16, 2019: China-Russia Eastern Gas Pipeline Nitrogen Purging Project
The China-Russia East Gas Pipeline Project was a key energy initiative in China in 2019, designed with the largest pipe diameter available at the time (φ1422mm). Upon completion, it will deliver Russian natural gas to Northeast and North China regions, effectively addressing winter gas shortages in northern areas.
On behalf of China National Petroleum Corporation Shandong Natural Gas Pipeline Co., Ltd., our company conducted nitrogen purging operations from August 20 to 22, 2019, on the natural gas pipeline system connecting the Tai'an Compressor Station to Valve Station No. 1 and from the Tai'an Compressor Station to Valve Station No. 18, ensuring the safety and reliability of the pipelines during subsequent maintenance or renovation activities.
On August 6, 2019, Sichuan Host Company received a notice from the Guiyang Oil and Gas Transmission Branch of China National Petroleum Group Southwest Pipeline Co., Ltd., requesting our company's personnel, equipment, and vehicles to immediately head to the Anshun Operation Area in Anshun County, Guizhou Province.
On October 29, as the Duokouhe Purification Plant successfully began operations, our company smoothly completed the helium-nitrogen pressure testing and leak detection integrated construction work for the purification facility at the Duokouhe Purification Plant, a key component of the capacity-building project aimed at developing the Feixianquan Formation gas reservoir in the Duokouhe-Qili North Gas Field within the Sichuan Basin.
Party A highly praised the team for their ability to "fight tough battles, tackle critical missions, and deliver impressive results," highlighting Host's robust expertise in specialized operations within sulfur-containing oil and gas fields. The project team will systematically summarize their experience working in high-temperature environments, continuously refining their technical capabilities to ensure smooth progress on major energy projects.
August 6, 2023: Sichuan Northeast Helium-Nitrogen Pressure Testing and Leak Detection Joint Project
The project spanned 42 days, achieving a 17% efficiency boost compared to similar projects. It successfully completed the full-system pressure testing and leak detection at the Xuanhan Purification Plant—all while maintaining zero accidents and zero delays. Recognized by the client for its innovative technology and lean management practices, the project earned a special commendation, setting a new industry benchmark for the safe commissioning of high-sulfur gas fields.
In October 2022, our company was urgently assigned the critical task of conducting nitrogen pressure testing, purging, and hot-work supervision for the newly constructed branch pipeline connecting to the Nanjing West Gas Transmission Station.
July 29, 2025: Sinopec Zhoushan LNG Receiving Station Phase III Pre-Cooling Project
On July 15, 2025, after receiving an urgent LNG task from ENN (Zhoushan), our company swiftly assembled a top-notch team within 10 hours. By the 18th, personnel had arrived in Zhoushan, and by the 20th, all equipment was fully in place—allowing us to complete efficient installation and commissioning within just 48 hours.
On September 18, 2024, our company was entrusted with the critical task of full-system drying, purging, and leak detection for Phase I of the Longkou Nanshan LNG Receiving Station project—the key component of the National Pipeline Network's Bohai Sea Strategic Initiative.
In April 2024, our company undertook the critical project—comprehensive system tightness testing—at the Guiyang Natural Gas High-Flow Metering Station, a key initiative of the Southwest Pipeline Company under the National Pipeline Group.
During the "May Day" holiday period, our construction team gave up their much-needed break to ensure the timely commissioning—scheduled for June—of Phase II of Zhejiang Zhoushan LNG Receiving Station, a key national energy project. The team is working tirelessly on the critical tasks of purging, drying, and purging the process pipeline system. Despite tight deadlines and heavy workloads, the project team has maintained an intense 11-hour daily schedule, with equipment running continuously around the clock. All while prioritizing safety and quality, they’re steadily advancing the project to deliver robust support for the nation’s energy strategy.
This construction is expected to complete the pipeline interconnection and jointing on May 29, 2020, followed by nitrogen purging on May 30, 2020.
The Xinao Zhoushan LNG Receiving Station project is located within the China (Zhejiang) Pilot Free Trade Zone. It is the first large-scale liquefied natural gas (LNG) receiving station approved by the National Energy Administration and invested in, constructed, and managed entirely by a private enterprise. Since the official operation of Phase I of the Xinao Zhoushan LNG Receiving Station, the project has further strengthened Zhejiang’s Free Trade Zone’s comprehensive oil-and-gas industry chain. Not only does it provide high-quality natural gas to residents and businesses in Zhoushan City, but it also serves as a critical gas supply source for Zhejiang Province’s ambitious “Gas Connectivity to Every County” initiative and plays a vital role in ensuring emergency gas supplies across the region.
On May 20, 2024, our company, responding to an urgent request from Tianjin Maiping Company, undertook the nitrogen-assisted operation supporting the three-axis high-definition magnetic flux leakage inspection of the Chengdu 102 Oil Depot branch pipeline (Φ168.3 mm × 7.31 km).
On September 4, 2023, our company undertook the critical task of rerouting the Lan-Cheng-Yu refined oil pipeline in the Airspace Economic Zone of Yanjiang District, Ziyang City, contributing to the development of a national-level strategic hub.
The Tieshanpo high-sulfur gas field is a key project for Southwest Oil & Gas Field Company as it accelerates production to reach 50 billion cubic meters. Our company is responsible for the final quality control of the Tieshanpo surface construction project—specifically, the helium-nitrogen joint pressure testing for leak detection and pipeline pigging operations.
The main construction activities include: nitrogen purging of the newly installed pipeline and nitrogen-driven oil displacement in the existing pipeline. The pipeline specifications are D508 mm × 3.41 km, with 1.73 km undergoing nitrogen purging for the new pipeline and 1.68 km utilizing nitrogen-driven oil displacement in the old pipeline.
The compressor commissioning project for the Yeshanguan Compressor Station is located in Yeshanguan Town, Badong County, Enshi Prefecture, Hubei Province. As part of the second-phase boosting project for the Sichuan-to-East Gas Pipeline, this project holds significant importance for the overall Sichuan-to-East Gas Pipeline system.
On September 18, 2024, our company was entrusted with the critical task of full-system drying, purging, and leak detection for Phase I of the Longkou Nanshan LNG Receiving Station project—the key component of the National Pipeline Network's Bohai Sea Strategic Initiative.
On March 30, 2024, following an urgent task assigned by the Pipeline Bureau of CNPC, our company promptly assembled a dedicated team along with specialized equipment and dispatched them to the site. At 1:00 PM on March 31, under the supervision of the client, we successfully initiated the first replacement operation—achieving pipeline hot-work connection readiness in just two hours.
On March 20 at 1:00 PM, we received an urgent notification from the Southwest Oil & Gas Field: the gas pipeline connecting Lianshan Station to Huixing Valve Chamber had been damaged by a third party.
On November 20, 2023, our company received an urgent notification from Chengdu Natural Gas Chemical Plant, requesting that we arrive at the Erlongkou Pigging Station in Luzhou within 24 hours (by 6:00 PM on November 21) to carry out gas shutdown and connection work on the Luwei Pipeline, followed by nitrogen purging to resume production.
The 2.5-hour operation on Section K061 (qualified at 6:30, finishing 30 minutes ahead of schedule) set a new record for pipeline replacement time on the large-diameter Φ1016mm pipeline. Using "Host speed," the team successfully eliminated two major pipeline hazards, ensuring the safe operation of the China-Myanmar energy artery.
On April 18, 2023, our company promptly responded to the deployment by the Southwest Pipeline Company of the National Pipeline Network, undertaking the critical nitrogen supply needed for the crucial pipe replacement and repair work at the defective weld joint located at K180+765m along the China-Myanmar pipeline (Longling County, Baoshan City, Yunnan Province).
The Tieshanpo high-sulfur gas field is a key project for Southwest Oil & Gas Field Company as it accelerates production to reach 50 billion cubic meters. Our company is responsible for the final quality control of the Tieshanpo surface construction project—specifically, the helium-nitrogen joint pressure testing for leak detection and pipeline pigging operations.
On March 20, 2023, our company undertook the critical task of nitrogen purging for the pipe replacement project targeting a circumferential weld crack defect at the K797+807m section of the Zhonggui Pipeline.
On February 24, 2023, our company undertook the nitrogen displacement project for the D1219mm high-pressure pipeline—designed for a pressure of 12 MPa and capable of transporting 100 million cubic meters of gas daily—connecting the Desheng Valve Station to the Yongchuan Gas Transmission Station along the main route of the Weijiang Line in the Southwest Oil & Gas Field.
December 24, 2022 – Huangjia Nitrogen Injection Construction Project
On December 24, 2022, Sichuan Host Oil and Gas Technology Co., Ltd. received an urgent notification from the Chengdu Natural Gas Chemical General Plant, instructing the company to complete the nitrogen displacement task for the Huangjia Project by 6:00 PM on December 25.
December 6, 2022 – Nitrogen Gas Unblockage Emergency Project at Well S3, Jiaoye Platform 85
In December 2022, our company urgently responded to a critical stuck-coil tubing incident at Well S3 on the Jiaoye 85 platform of Sinopec Jianghan Oilfield, deploying liquid nitrogen equipment to the site within 24 hours.
In October 2022, our company undertook the core node—nitrogen displacement technical services—for the pilot production mainline project at the Anyue Purification Plant Gas Gathering Station, a key component of the gas extraction management office's Pengtan Well Area No. 1 in northern and central Sichuan.
On September 10, 2022, amid the challenging pandemic control situation in Chengdu and Guizhou, our company was entrusted with the critical task of providing nitrogen-injection services for seven circumferential weld defects along the China-Myanmar pipeline's Guizhou section.
August 11, 2022: Yuanba First Station Metering Upgrade Project – Nitrogen Purging Project
This project is located at the nitrogen injection point in Yuanba First Station. The scope of work primarily includes a tie-in pipeline with specifications of D1016 mm × 22 km, as well as the Yuanlang Pipeline, which measures D406 mm × 34 km.
July 14, 2022: Weiqing Line Pressurized Nitrogen Replacement Project
This project is located at the Chengdu Gas Transmission Station of the Gas Transmission Management Division, Southwest Oil & Gas Field Company, featuring a pipeline with specifications of D720 mm × 39 km and operating under a natural gas pressure of 0.9 MPa.
On June 14, our company meticulously carried out the pre-commissioning nitrogen displacement for the newly constructed D610mm pipeline (total length: 42 km) connecting the Nanchuan Dayou Gas Distribution Station in Chongqing to the Dongsheng Gas Distribution Station. Equipment debugging was completed at 7:00 a.m., and operations were officially launched on time at 8:10 a.m. After five hours of relentless effort, the project was successfully completed at 1:10 p.m., with the first inspection passing flawlessly. Throughout the process, the project team maintained rigorous procedures and seamless collaboration, delivering the project on schedule with zero errors and ensuring exceptional quality—earning high praise from the client.
In this southern construction project, as per the work schedule arranged by the Chongqing Oil and Gas Transmission Branch of Southwest Pipeline, three Class-I hot work operations along the Zhonggui Pipeline are planned to be carried out consecutively from May 6 to May 10. Our company has been invited to perform nitrogen purging on the pipelines involved in these hot work activities. After multiple on-site inspections and optimization of the proposed plan, our project team initiated the first phase of the operation at 5:40 a.m. on May 6. Remarkably, both designated monitoring points achieved compliance simultaneously within just 3 hours—exactly matching the scheduled timeline. This efficient execution has created a critical window for subsequent project milestones, earning high praise from the client.
May 6, 2022 – Yeshan Guan Compressor Station Pipeline Nitrogen Purging Project
On April 25, after receiving the special-class hot-work notification, our company faced the nationwide challenge of restricting hazardous chemical vehicles during the May Day holiday. Despite the associated costs, we proactively deployed liquid nitrogen equipment ahead of schedule and arrived on-site by April 29 to ensure project deadlines were met. At 7:30 a.m. on May 6, we initiated the purging operation, achieving compliance within just one hour—two hours earlier than originally planned. This allowed us to secure a critical time window for subsequent welding work, ultimately helping to keep the nation’s key pipeline project on track.
During the "May Day" holiday period, our construction team gave up their much-needed break to ensure the timely commissioning—scheduled for June—of Phase II of Zhejiang Zhoushan LNG Receiving Station, a key national energy project. The team is working tirelessly on the critical tasks of purging, drying, and purging the process pipeline system. Despite tight deadlines and heavy workloads, the project team has maintained an intense 11-hour daily schedule, with equipment running continuously around the clock. All while prioritizing safety and quality, they’re steadily advancing the project to deliver robust support for the nation’s energy strategy.
On September 10, 2020, our company was assigned the critical task of ensuring nitrogen safety during an emergency pipeline replacement and connection project targeting eight defective welds along the Guizhou section of the China-Myanmar natural gas pipeline. Upon receiving the assignment, we swiftly mobilized resources, completing the deployment of our engineering command vehicle, liquid nitrogen equipment, and a 14-member construction team by 5:00 PM on September 12. The team arrived promptly at the site—Valve Station No. 50—as scheduled.
Sichuan Host Oil and Gas Technology Co., Ltd.
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