Project Title:Key Technologies for Economical Development of Deep Coalbed Methane and Their Large-Scale Application
Participating Enterprises: Hangzhou Fenghe Petroleum Technology Co., Ltd.; Hangzhou Fenghe Measurement & Control Technology Co., Ltd.
Award Received: Scientific and Technological Progress Award - Gold Award
Achievement Level: International Advanced Level
Project Number: ECF-2025-SET-1003
Main Participants: Xu Tao, Zhou Jianwen, Xu Lin, Zhou Fuchang, Qiu Haitao, Wang Shenghuan, Li Fang, Liu Jie, Shen Xiongwei
Expert Review Comments: International advanced level. Aiming at the “choke point” technical challenges of logging in ultra-deep, complex well conditions, the project systematically overcame bottlenecks in logging tool design, signal acquisition, and real-time monitoring under high-temperature and high-pressure environments, and developed a series of logging tools and processes rated to 230°C temperature resistance, 206 MPa pressure resistance, and 20-ton tensile strength. Innovative achievements include a high-strength acoustic isolator, an integrated probe, a non-contact ultrasonic caliper system, and a direct-push memory logging technology, collectively achieving a leap from “following” to “leading.” The project results were successfully applied in ultra-deep wells such as “Deep Earth Taklamakan No. 1,” creating the world’s deepest logging record, significantly enhancing China’s logging capabilities under ultra-deep, ultra-high-temperature/pressure, and high-inclination well conditions, and establishing an independent and controllable industrial chain. The equipment demonstrates high reliability with remarkable economic and social benefits, providing important support for China’s strategic exploration and development of deep terrestrial and deep-sea oil and gas resources, and holding broad prospects for international market application.
Main Innovations:
① Invented a high-strength acoustic isolator, with tool push–pull strength up to 20 tons, creatively solving the bottleneck of insufficient tool strength—“can’t run downhole”—in logging operations under complex well conditions.
② Developed real-time geosteering wellbore condition monitoring technology, resolving the common “blind logging” safety issue associated with memory tools in downhole measurements.
③ Developed acoustic far-field detection technology, achieving a radial investigation radius of 70 meters around the wellbore and solving the “can’t see far” problem.
Main Uses and Technical Principles:
Main Uses: Exploration, development, and geological evaluation of onshore and offshore mineral resources. Sensors based on acoustic, electrical, and nuclear principles collect physical parameters at different depths in subsurface strata to form continuous “logging curves” or images, indirectly obtaining formation lithology, porosity, fluid properties, permeability, formation pressure and temperature, and other information, thereby providing a scientific basis for resource evaluation, development decision-making, and engineering optimization.
Technical Principles: By measuring the physical properties of formations surrounding the wellbore (e.g., electrical, acoustic, nuclear, and mechanical characteristics), rock parameters are indirectly obtained (e.g., lithology, porosity, permeability, and fluid properties). Different logging tools are designed based on different physical principles, spanning interdisciplinary fields such as physics, electronics, chemistry, and computer science.
Technical Applications:
Domestic oilfield application and promotion
The performance indicators of the project’s technologies and equipment in ultra-high-temperature, high-pressure, and high-strength domains surpass those of similar instruments from the three major international service companies, making them powerful tools for detecting deep to ultra-deep reservoirs in complex well conditions. They have been widely applied in China’s Tarim, Southwest, Changqing, Daqing, Shengli, and Bohai oilfields with complex high-temperature geology, successfully completing hundreds of logging runs in ultra-deep complex wells over 6,000 meters, and 10 logging applications in national key projects exceeding 9,000 meters. In particular, the tools successfully completed logging in China’s first 10,000-meter scientific exploration well “Deep Earth Taklamakan No. 1,” promoting an internationally significant technological breakthrough for China in ultra-deep oil and gas exploration.Overseas oilfield application and promotion
Following CNPC Logging International, the project equipment has entered overseas markets, being widely applied in deep complex oilfields in Iraq’s Missan Oilfield, Chad, Nigeria, Turkmenistan, Kazakhstan, and other countries—marking a strong step for domestically produced high-end logging equipment to go global and providing robust support for oil and gas exploration along the Belt and Road.Typical application cases
① Case 1: CNPC Southwest Oilfield—Shuangyu 001-H6 Well
The Shuangyu 001-H6 well in the Sichuan Basin (Guangyuan City) was completed on June 23, 2022, with a total depth of 9,010 m—the first ultra-deep onshore CNPC well exceeding 9,000 m. The well featured ultra-depth, ultra-high temperature, ultra-high pressure, and high-corrosion conditions, with complex vertical pressure systems, a narrow safe density window, and prone-to-collapse formations. From July 2–5, 2022, CNPC Logging Southwest used our high-temperature, high-pressure, high-strength direct-push memory logging system and, within only 75 hours, overcame the challenges of “ultra-high temperature (bottomhole temperature near 180°C), ultra-high pressure (formation pressure over 130 MPa), ultra-depth (9,010 m), and high corrosion (H₂S content up to 6/m³).” High-quality complete logging data were acquired in a single run, setting two records: China’s deepest onshore gas well logging and CNPC’s deepest well logging.
② Case 2: Pengshen 6 Well
The key exploratory well Pengshen 6, in Yanting County, Mianyang City, Sichuan Basin, targets the Dengying Formation in the Penglai Gas Area and is the second ultra-deep well over 9,000 m drilled by Southwest Oil & Gas Field since the 12th Five-Year Plan. Its objective is to explore reservoir development and gas-bearing potential deeper than 8,000 m in the Dengying Formation, with major significance for unlocking hundreds of billions of cubic meters of hydrocarbons in the area. Facing super-deep, ultra-high-temperature/pressure, and severe lost-circulation challenges, in early February 2023 CNPC Logging Southwest applied our ultra-high-temperature/high-pressure logging system, and in a single run under “ultra-high temperature (bottomhole 197°C), ultra-high pressure (formation pressure over 130 Pa), ultra-depth (9,026 m)” conditions, acquired all logging data with high quality and efficiency—setting the record for Asia’s deepest vertical well logging and leaving a landmark contribution to ultra-deep exploration for future Sichuan Basin 10,000 m scientific wells (Chuanke No. 1).
③ Case 3: Tarim Shunzong-1 Deviated Well
The Shunzong-1 deviated well in the Tarim Basin is the first completed ultra-deep well of Sinopec Northwest Oilfield under the “Deep Earth No. 1” campaign. Located in a remote desert with extremely complex subsurface structures, it presents globally rare characteristics of ultra-depth, ultra-high temperature, and ultra-high pressure, making geological understanding and reservoir identification exceptionally difficult. On October 31, 2023, the fourth section was completed at 9,316.27 m, setting new records in the Shunbei area for deepest hole depth and deepest core-taking along a deviated trajectory. Its exploration is vital for breakthroughs in new ultra-deep domains and stratigraphic systems in the Shunbei Oilfield and for resource replacement. Logging objectives:
① Investigate reservoir development and hydrocarbon potential in the lower interval of the Ordovician Yingshan Formation within interlayer “string-of-beads” structures in Shunbei Oilfield;
② Provide a basis for fault-zone description/evaluation and reservoir prediction method research in the area;
③ Provide data for integrated geological studies and reserves forecasting.
From November 4–11, 2023, commissioned by Sinopec Northwest Oilfield, CNPC Southwest Measurement & Control’s Xinjiang Branch carried out logging in Shunzong-1 using our Fenghe 85PL.S-X direct-push memory instrument. Over 130 hours, complete and accurate logging data were obtained. The measured bottomhole temperature was 199.6°C and pressure 160 Pa, setting the Northwest Oilfield’s record for the highest well temperature in memory-mode operations.
④ Case 4: Deep Earth Taklamakan No. 1
Deep Earth Taklamakan No. 1 is located in the heart of the Taklamakan Desert, Shaya County, Xinjiang. With a designed depth of 11,100 m, it is China’s first 10,000-meter scientific exploration well, carrying dual missions of scientific exploration and hydrocarbon discovery. Beyond its great significance for addressing fundamental scientific questions—such as revealing the composition and structure of the continental crust, exploring deep Earth fluid systems and geothermal structures, and probing Earth’s evolutionary laws—it will also help break traditional geological understandings and form a China-specific geological theory of hydrocarbon accumulation at 10,000 m depth. It is a milestone breakthrough for China in the “deep space, deep sea, deep Earth, and deep blue” arenas. To ensure the smooth implementation of logging in the 10,000 m well, CNPC Logging Manufacturing Company and our company jointly developed two sets of ultra-high-temperature/high-pressure direct-push memory logging systems. In December 2023, during logging of the third section of Taklamakan No. 1, after the originally preferred equipment failed to complete the job, our equipment participated as the backup and completed all logging tasks in a single run, earning high recognition from CNPC Logging. On July 30, 2024, our products served as the primary equipment for the fourth section logging (well depth 9,890 m; bottomhole temperature 188°C; well pressure 142 MPa), completing the task despite multiple challenges. On December 20, 2024, designated as CNPC Logging’s sole logging equipment, our products performed the fifth section logging of the 10,000 m well, obtaining the world’s first logging data beyond 10,000 m (logged depth 10,864 m; well depth 10,910 m; bottomhole temperature 207°C). All required logging projects were completed, setting the world’s deepest logging record.
