Construction Case
CORTECH has customers in over 30 provinces, municipalities, and autonomous regions in China, as well as more than 20 countries and regions such as Russia, the United Kingdom, Australia, and Brazil. We are an internationally renowned supplier of hydraulic drilling rigs.
The Daqing Oilfield has entered the middle to late stages of development, with a large number of old wells and strong demand for workover and sidetracking operations. Conventional workover rigs rely on manual operation, resulting in extremely high labor intensity, low construction efficiency, frequent safety accidents, and non-traceable construction data, making it difficult to meet the demands of intelligent and high-efficiency oilfield development. There is an urgent need for automated integrated drilling and workover equipment compatible with multiple processes—drilling, workover, and sidetracking—suitable for high-temperature, high-corrosion conditions in the oilfield, enabling unattended and remote operation.
Our company provides the DW20 automated integrated drilling and workover rig, featuring a fully electric-plus-hydraulic dual-control design, equipped with an automatic pipe handling system, a remote operation platform, and a data acquisition and traceability system. It is adaptable to all oilfield operating conditions and can efficiently perform workover, sidetracking, and reperforation operations on old wells, significantly reducing manual dependency. Since its application, the workover cycle for a single well has been shortened by 50%, labor has been reduced by 60%, safety accidents have been reduced to zero, and the equipment has demonstrated stable operation and strong reliability. It has now been deployed across multiple blocks of the Daqing Oilfield, promoting the intelligent upgrade of workover operations in the oilfield.
The construction contractor is Team 6 of Jilin Geological Bureau. The project is located in Fushun, Liaoning Province. The CSD1300L crawler-mounted fully hydraulic core drilling rig was used for gold exploration, aiming to identify the distribution, scale, and grade of gold ore bodies in the area, providing a reliable geological basis for subsequent mineral development.
The project lasted seven months. The wireline coring process was adopted, with a single-hole diameter of 75mm. The deepest hole reached 430 meters, and a total cumulative footage of 4,000 meters was completed. Thanks to its crawler-mounted chassis design, the CSD1300L drilling rig offers excellent site adaptability, enabling rapid positioning and operation in complex field terrain conditions. Its stable drilling system and high-precision guidance device effectively ensured coring quality and construction efficiency during the gold exploration process, providing complete and accurate geological data support for resource evaluation and development planning.
The Kashgar region of Xinjiang is rich in uranium resources with great exploration potential. However, the construction area is located in a high-altitude, arid desert zone with extreme diurnal temperature variations (ranging from -30°C to 45°C), severely fractured formations, and harsh sandstorm conditions. Conventional drilling rigs have poor adaptability and high failure rates, making stable operation difficult. There is an urgent need for customized plateau-type exploration equipment.
Our company provided the CMR1000A multi-functional drilling rig, custom-developed for extreme plateau environments. It is equipped with a plateau-type engine, a reinforced chassis, and a combination of multi-process drill tools, capable of meeting various process requirements such as coring, reverse circulation, and air drilling simultaneously. Over the course of the project, a total of 28 exploration holes were completed, with the deepest reaching 850 meters. Excellent coring quality was achieved, accurately identifying the distribution and reserves of uranium resources, thereby supporting the development of the energy exploration industry in Xinjiang.
The deep coalbed methane (CBM) resources in the Qinshui Basin of Shandong Province are abundant with huge development potential. However, the reservoir features a large burial depth, frequent alternations between soft and hard formations, high curvature in the build-up section, and high resistance in the horizontal section. Conventional drilling rigs lack sufficient torque and braking stability, making them prone to pipe sticking and borehole deviation during construction, and unable to complete challenging directional drilling operations. This places extremely high demands on the rig's directional capability, torque reserve, and overall stability. The project required a final well depth exceeding 2,000 meters and a horizontal section length of over 900 meters, with wellbore quality directly affecting CBM extraction efficiency, making the construction difficulty industry-leading.
The CMD100 intelligent truck-mounted drilling rig was selected, equipped with a high-precision MWD measurement-while-drilling inclinometer, a high-torque spindle braking system, and an air DTH hammer high-efficiency drilling process. It precisely controlled the curvature of the build-up section and the trajectory of the horizontal section, ensuring wellbore quality. The final well depth reached 2,010 meters, with a maximum deviation angle of 88.42°, a horizontal section length of 950 meters, and gas production meeting the required standards. This well has become a benchmark for efficient deep CBM development in North China, providing proven experience for similar challenging horizontal well construction.
The Shendong Mining Area is a core coal production base in China, characterized by complex geological conditions, high gas content, and a harsh underground working environment. Traditional manual drilling involves high labor intensity, significant safety risks, low efficiency, and non-traceable construction data, making it difficult to meet the requirements of smart mine construction. There is an urgent need for automated and intelligent drilling equipment to achieve workforce reduction, efficiency improvement, safety control, and data traceability, thereby enhancing the intelligence level of underground drilling operations.
Our company provided Shendong Coal with a complete set of equipment, including the CMD60L multi-functional automated drilling rig, the CRD3000 automated core drilling rig, and the Hurricane series high-pressure air compressors. These are equipped with intelligent control systems, remote monitoring systems, automatic rod handling devices, and parameter auto-optimization modules, enabling automatic optimization of drilling parameters, unattended operation, remote control, real-time data upload, and cloud storage, while being suitable for underground explosion-proof environments. Since the equipment was put into operation, it has accumulated over 8,000 operating hours without any major failures, demonstrating stable operation and reliable performance, with drilling efficiency increased by more than 40%. It has significantly reduced labor intensity, decreased the number of underground personnel, and improved construction safety, providing an efficient, intelligent, and safe drilling solution for coal mine geological exploration, gas control, and water hazard prevention, and has become a benchmark for the application of drilling equipment in smart mines.
A deep mine in Shandong Province has a large mining depth, resulting in high underground ventilation resistance and insufficient airflow, which severely affects the safety of the working environment. There was an urgent need to construct a deep, large-diameter ventilation shaft to improve ventilation conditions. The formation at the construction site features great depth, high rock hardness, and well-developed fracture zones. Conventional drilling rigs suffer from low efficiency and long construction periods, making it impossible to meet the urgent needs of mine safety production.
Our company selected the CMD130 truck-mounted drilling rig, equipped with a large-diameter cluster DTH hammer, and adopted a stepwise reaming process to efficiently address the challenges of deep hard-rock formation construction. The project was completed in 32 days, constructing a ventilation shaft with a diameter of Φ710mm and a depth of 920 meters. The construction quality was excellent, and the ventilation capacity met the design requirements, ensuring safe production in the deep mine. This project provided proven experience for ventilation projects in similar deep mines.
Shanxi Lanyan Group, a leading enterprise in China's coalbed methane (CBM) development, needed to construct large-diameter, deep CBM wells. With reservoir burial depths ranging from 800 to 1,200 meters and high formation pressures prone to blowouts, the project imposed extremely high demands on drilling rig torque reserve, blowout prevention capability, and operational safety. Our company selected the CMD180SD electric top-drive drilling rig, which features high torque and high rotational speed, and is equipped with a specialized blowout prevention system, making it perfectly suitable for high-pressure formation conditions. Over the course of the project, a total of five CBM wells were completed, with the deepest reaching 1,280 meters. Stable gas production was achieved, with an average daily gas output exceeding 12,000 cubic meters per well. This provided critical support for the large-scale development of CBM in Shanxi and contributed significantly to the region's energy transition.
The construction contractor was Team 133 of the Gansu Coalfield Geology Bureau. The project was located in Jingtai, Gansu Province. The CSD3000 crawler-mounted fully hydraulic core drilling rig was used for coalfield geological exploration, with the aim of identifying regional coal seam distribution, thickness, and occurrence conditions, providing a reliable geological basis for coal resource development.
The project lasted six months. Wireline coring was the primary process, with a single-hole diameter of 95mm. A total cumulative footage of 3,000 meters was completed, and multiple groups of exploration holes were efficiently drilled. Thanks to its crawler-mounted chassis design, the CSD3000 drilling rig offers excellent site adaptability, enabling rapid positioning and operation in complex terrain conditions. Its high-torque power head and stable drilling system effectively ensured coring quality and construction efficiency during the coalfield exploration process, providing complete and accurate geological data support for subsequent resource evaluation and development planning.
As a national-level professional mine emergency rescue team, the Special Exploration Center of the China National Administration of Coal Geology conducted an emergency drill for mine accidents to enhance its operational capabilities and test equipment performance. The drill simulated real scenarios of roof falls and collapses, requiring the rapid construction of a large-diameter life channel to verify the practical adaptability and reliability of rescue equipment. Our company provided the CMD50L modular rescue drilling rig. This rig features a lightweight, modular design with a single-component transport weight of ≤20 tons, enabling rapid airlift deployment and perfect adaptation to confined space operations in mines and tunnels. It is equipped with a specialized auger drill pipe and a cluster DTH hammer, offering outstanding horizontal drilling capability. During the drill, the equipment efficiently completed a Φ600mm, 80-meter-deep horizontal rescue borehole in 6 hours and successfully deployed a rescue capsule. The rig demonstrated stable performance and easy operation, earning high recognition from the rescue team. It has since been integrated into the national emergency equipment reserve system.
The area around the Fengman Reservoir in Jilin is rich in geothermal resources. However, the formations are dominated by hard granite and basalt, characterized by high rock hardness, strong abrasiveness, well-developed fracture zones, and abundant fissure water. Conventional mud drilling suffers from extremely low efficiency, severe drill tool wear, frequent borehole collapse, uncontrollable construction schedules, high costs, and low productivity. There was an urgent need for efficient rock-breaking technology and specialized equipment to overcome the challenges of hard-rock drilling.
Our technical team made an innovative breakthrough by adopting the CMD series fully hydraulic drilling rig, equipped with a high-strength DTH hammer and specialized high-strength drill pipes. The full-process air DTH hammer positive circulation high-efficiency drilling process was implemented, achieving rapid hard-rock breaking and efficient cuttings removal, reducing drill tool wear, lowering the risk of borehole collapse, and significantly improving construction efficiency. A geothermal well with a depth of 2,004.42 meters and a final borehole diameter of 190mm was completed. The net drilling time was only 387 hours, achieving a drilling efficiency 5 to 10 times higher than that of conventional mud drilling processes. The well quality was excellent, and the geothermal resource potential was highly promising. This project provided an efficient, economical, and reliable technical solution for geothermal exploration in hard-rock formations in Northeast China, promoting the development and utilization of regional geothermal resources.
As a state-level new area, Xiong'an New Area has an urgent need for the development of green and low-carbon energy. Geothermal resources, as a clean and renewable energy source, are of great significance for heating and emission reduction in the new area, making the construction of ultra-deep geothermal wells to extract geothermal resources an urgent priority. The designed final well depth was 3,780 meters. The formation was dominated by sedimentary rock, with frequent alternations between soft and hard layers, high hardness at depth, strong abrasiveness, and well-developed fracture zones. The project involved a long construction period, high technical difficulty, and significant risks, imposing industry-leading demands on the drilling rig's torque, lifting capacity, stability, and deep-hole drilling capability.
Our company selected the CMD180T fully hydraulic modular energy drilling rig, equipped with high-strength specialized drill tools, a mud purification system, and a real-time borehole inclination monitoring system. The mud roller cone drilling process was adopted, with an opening borehole diameter of Φ406mm, gradually reducing in steps to a final diameter of Φ152mm. Verticality and borehole quality were strictly controlled throughout the process to prevent deviation and collapse in the deep hole. The Ninth Team of Hebei Bureau of Geology and Mineral Exploration was responsible for the entire construction process, successfully completing the 3,780-meter ultra-deep geothermal well in 230 days. The borehole verticality, well diameter, and cementing quality all achieved excellent standards, and complete geothermal geological data were obtained. This project provided important geothermal resource data and an engineering example for the green and low-carbon energy construction of Xiong'an New Area, contributing significantly to the development of a "coal-free city" in the new area.
During the construction of a hot dry rock exploration well in the Tianzhen area, the drill encountered a deep fracture zone, resulting in intense water inflow. The contact between high-temperature groundwater and the hot dry rock triggered a sustained blowout, with the wellhead water temperature reaching as high as 158°C. The blowout continued for two months without being effectively brought under control. Conventional drilling rigs could not withstand prolonged exposure to high temperatures—seals aged and failed, and hydraulic system malfunctions occurred frequently. There was a lack of specialized emergency equipment capable of withstanding high temperatures, offering high stability, and providing high torque on site, making well-killing operations extremely difficult and highly risky. The situation directly threatened the safety of personnel and equipment, and improper handling could have led to even more serious accidents.
Our company urgently dispatched core emergency rescue equipment, deploying the CMD150T fully hydraulic modular energy drilling rig. This rig features a high-temperature-resistant hydraulic system, special seals, and a high-strength structural design, enabling it to endure prolonged operation under high-temperature conditions up to 160°C with exceptional stability. In addition, a self-developed specialized well-killing device was provided, and a scientifically rigorous well-killing process plan was formulated. Personnel remained on standby 24/7, monitoring equipment status and blowout conditions in real time. After two months of continuous exposure to high temperatures and demanding operations, all functions of the drilling rig remained normal, stable, and reliable. Without relying on other large equipment, the rig independently completed the entire well-killing operation and successfully brought the high-temperature blowout under control, ensuring the safety of on-site personnel and equipment. This operation overcame the rare challenge of a high-temperature hot dry rock blowout emergency in China, filled a technical gap in the industry, and provided valuable experience for emergency response under similar extreme conditions.
The Qinshui Basin is a core coalbed methane (CBM) producing region in China, with abundant reserves and huge development potential. Large-scale construction of L-shaped horizontal directional wells is required to improve CBM recovery rates. The reservoir burial depth ranges from 160 to 1,000 meters, with the horizontal section needing to extend approximately 1,000 meters. The construction area is mostly mountainous with complex road conditions, demanding high drilling rig mobility, precise directional control, and easy relocation. At the same time, technical challenges such as alternating soft and hard formations, difficulty in building the curved section, and high resistance in the horizontal section must be addressed.
Our company provided the CMD100 fully hydraulic truck-mounted drilling rig, equipped with a high-precision MWD wireless while drilling (measurement-while-drilling) system and a high-torque spindle braking system. Using the air DTH hammer high-efficiency drilling process, the rig can complete the integrated construction of the vertical well, curved section, and horizontal section in a single operation, effectively solving problems such as difficulty in building the curve and high resistance. The No. 3 Team of the Shandong Coalfield Geology Bureau used this drilling rig to construct a typical CBM horizontal well: the final depth reached 2,010 meters, the vertical depth was 1,060 meters, and the horizontal section length was 950 meters. The entire project was completed in just 16 days, with excellent wellbore quality and favorable gas production, significantly improving CBM development efficiency. This provided efficient equipment support for the large-scale development of CBM in the Qinshui Basin, with the rig cumulatively serving dozens of CBM wells in the region, becoming an industry benchmark.
Due to poor underground ventilation, high gas concentrations, and harsh working conditions at a large-scale mine in Qinyuan County, safety hazards had long existed. There was an urgent need to construct a new deep, large-diameter ventilation shaft to improve ventilation conditions, reduce the risk of gas accumulation, and ensure underground operational safety. The formation featured frequent alternations between soft and hard layers, locally developed fracture zones, susceptibility to borehole collapse, and susceptibility to air leakage, imposing extremely stringent requirements on the drilling rig's torque, lifting capacity, stability, and process adaptability. Conventional drilling rigs suffered from low efficiency, high accident rates, and uncontrollable construction schedules, making it difficult to meet the project's requirements.
Our technical team developed a targeted construction plan, selecting the CMD100 fully hydraulic truck-mounted drilling rig and implementing the proven process of "pilot hole + stepwise reaming." First, a Φ216mm pilot hole was drilled to quickly identify the formation conditions. The hole reached a depth of 254 meters and was completed in just 2 days. Subsequently, stepwise reaming was carried out using the raise boring method, with drill bits of Φ470mm and Φ710mm successively used to ream the hole to the designed diameter. Throughout the process, wall stabilization measures were reinforced to prevent borehole collapse. The entire ventilation shaft project was successfully completed in 26 days, with an average penetration rate of 3–5 meters per hour during the reaming phase. The borehole quality was excellent, the shaft wall was stable, and the ventilation performance fully met the mine's safety standards. The project effectively improved underground ventilation conditions, reduced the risk of gas accumulation, and ensured the mine's long-term safe production. It has become a demonstration project for ventilation shaft construction in the region, providing a proven process reference for similar projects.
At 22:53 on July 2, 2016, a major water inrush accident occurred at the Zhongcun Coal Mine in Qinshui County, Jincheng City. Twelve miners were trapped 117 meters underground. With water levels rising rapidly, confined underground space, insufficient oxygen, and completely severed supplies, the trapped miners' lives were in imminent danger. The accident area featured fractured geology, high water levels, and extremely unstable strata. Conventional rescue equipment had slow deployment, low efficiency, and high operational risks. The need to open a life channel was urgent, with every second counting.
Upon receiving the emergency rescue order, our company responded immediately, urgently dispatching a CMD100 fully hydraulic truck-mounted drilling rig that was operating at a nearby site. Within one hour of receiving the order, the equipment was in position, installed, debugged, and drilling commenced. Using a large-diameter air rapid drilling process, the operation featured precise directional control and efficient performance, minimizing construction time to the greatest extent. From the start of drilling to successfully penetrating the 117-meter life channel to the underground area, it took less than five hours. Oxygen, nutrient solutions, and medicines were successfully delivered to the trapped area, and stable communication was established. Ultimately, eight trapped miners were successfully rescued, buying crucial time for the emergency response. This operation fully demonstrated the core strengths of domestically manufactured rescue equipment—rapid response, high efficiency and reliability, and outstanding practical performance—earning high praise from the government, rescue teams, and the public.
Due to long-term mining at an old mine in Henan Province, underground water accumulation had become increasingly severe, with the water level continuously rising, directly threatening the safety of mining operations. There was an urgent need to rapidly construct a large-diameter drainage rescue well to efficiently remove the accumulated water and restore normal production conditions at the mine. The construction area featured severely fractured formations, extremely high water inflow, and poor geological stability. Conventional drilling rigs had weak wall stabilization capabilities and low drainage efficiency, failing to meet the requirements of emergency rescue operations.
Given the urgency and complexity of this rescue project, our company selected the CMD100 truck-mounted drilling rig, equipped with a large-diameter DTH hammer and dual-wall drill pipe, and adopted the air reverse circulation drilling process. This enhanced wall stabilization effects and drainage capacity, effectively addressing the challenging conditions of fractured formations and high water inflow. The project was completed efficiently in 18 days, constructing a large-diameter drainage well of Φ710mm with a depth of 280 meters. The average daily drainage volume exceeded 5,000 cubic meters, quickly eliminating the underground water accumulation hazard and creating critical conditions for the mine's resumption of production. This project has become a benchmark case for mine drainage rescue engineering in China.
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