Baoshi Machinery’s Chengdu subsidiary has successfully completed China’s first ultra-long perforating gun segmented cutting and fishing operation under pressure, establishing a new benchmark for pressurized workover technology in the domestic oil and gas industry.

The groundbreaking operation, conducted at a user site, involved the retrieval of a 1,711-meter perforating gun assembly under pressurized conditions. This achievement represents a significant milestone in China’s ultra-deep well intervention capabilities and demonstrates the advancing sophistication of domestic oilfield service technology.

Perforating guns are specialized tools used in oil and gas well completion to create openings in well casing and surrounding rock formations, allowing hydrocarbons to flow into the wellbore. The cutting and retrieval of such equipment under pressure presents significant technical challenges, particularly when dealing with ultra-long assemblies in deep well environments.

The operation utilized Baoshi Machinery’s proprietary pressurized workover equipment in conjunction with a 70 MPa perforating gun cutting and sealing integrated device. The innovative segmented cutting process successfully addressed critical technical challenges including cutting precision control in pressurized environments and prevention of severed components from falling into the wellbore.

The pressurized workover system installed at the site featured a mast height of 36.15 meters with an operating platform positioned at 24 meters. Supporting equipment included a specially manufactured 120-ton stabilizer and a 35-meter ultra-long fire-resistant flexible escape tube, providing comprehensive safety assurance for the high-risk operation.

The 36.15-meter installation height establishes a new national record for pressurized workover equipment, indicating the scale and complexity of modern deep well intervention operations in China’s evolving oil and gas sector.

Facing complex downhole conditions including tubing string obstruction, the pressurized workover team implemented an innovative four-stage process: “grip-cut-grasp-retrieve.” This methodology required precise coordination and continuous monitoring to ensure safe execution under pressurized conditions.

The operation spanned seven consecutive days, reflecting the meticulous approach required for such complex intervention work. Pressurized workover operations, also known as live well interventions, allow maintenance and repair activities to be conducted without killing the well, thereby preserving reservoir pressure and reducing operational costs.

The successful completion of this challenging project validates the reliability and technological advancement of Baoshi Machinery’s pressurized workover systems, positioning the company’s equipment capabilities at the forefront of domestic intervention technology.

The successful operation provides a new technical solution for similar gas field water reinjection well workover activities. Water reinjection wells play a crucial role in enhanced oil recovery and formation pressure maintenance, making reliable intervention capabilities essential for optimizing field development strategies.

This technological breakthrough holds significant implications for advancing China’s oil and gas field development capabilities, particularly in ultra-deep and complex reservoir environments that require sophisticated intervention techniques.

The achievement demonstrates the growing technical maturity of China’s domestic oilfield service sector and supports the industry’s transition toward more challenging exploration and development targets in deeper and more complex geological formations.

About the Operation: The 1,711-meter ultra-long perforating gun segmented cutting and fishing operation represents a milestone in China’s pressurized well intervention capabilities, establishing new technical standards for ultra-deep well workover activities and contributing to the advancement of domestic oil and gas field development technologies.