On September 13th, good news came from the on-site application of the scientific and technological research results of the group company undertaken by the Unconventional Research Institute of China Petroleum Exploration and Development Research Institute. Based on the research results of the project, the Guizhou shale gas Anye 12-1HF, which was deployed and designed, has continuously increased its daily gas production per well after two months of trial production, and has now exceeded 40000 cubic meters, becoming the highest production and lowest development cost well in the block.

This breakthrough marks the initial effect of the development concept of "reasonable seam layout to meet the needs of gas reservoir development" proposed by unconventional research institutes, as well as the application of new development optimization technologies to increase production and reduce single well costs in shale gas wells.

In 2023, the unconventional institute obtained the development technology support service contract for the Anchang Block of Guizhou Shale Gas Company through bidding, and undertook the company's shale gas geology, gas reservoir engineering, and development design work. The Anchang shale gas field is located in the complex structural area of southeastern Sichuan. The geological conditions of the gas field are complex, with developed faults and single well production characteristics such as low initial production and fast decline rate, making development more difficult.

After undertaking the task of supporting the exploration and development of shale gas in Anchang, the unconventional research institute quickly formed a research and development project team. Through geological evaluation, reservoir geological modeling, and stress field analysis, the favorable sweet spot of the southwest wing of Anchang was comprehensively determined, and the overall geological design for the development of the platform was completed.

The project team innovates the new concept of shale gas development, fully implements the first principle of shale gas development proposed by project leader Xiong Wei, highlights the reasonable deployment of fracture networks, and leverages the ability of single fracture seepage and storage control. By optimizing the spacing between clusters and the number of perforations, uniform seam distribution can be achieved, promoting full transformation.

After optimizing the plan, the number of single shower holes is reduced by 50% to 60%, the liquid and sand volume of a single well is reduced by 25% to 35%, the liquid and sand volume of a single hole is increased by 2 to 3 times, and the single fracture sand ratio is increased by more than 15%. Preliminary calculations show that the fracturing cost of a single well is reduced by 20% to 30%. After initial trial production, the daily gas production of Anye 12-1HF is 42000 cubic meters, which is 1.5-2 times that of neighboring platform wells, significantly increasing the production of low-grade shale gas single wells.

This technology will be designed and applied in three wells of the H21 platform pilot test project in the Da'an block of the Sichuan Basin through the innovation consortium of the Exploration Institute and Zhejiang Oilfield Company. The development plan has been reviewed by the oilfield company and the first batch of on-site tests for PetroChina wells will be carried out next month.

The unconventional research institute will continue to strengthen its research and development of new technologies and methods for shale gas exploration and development, and create a killer technology for shale gas benefit development, making scientific and technological contributions to the shale oil and gas revolution of China Petroleum Exploration Institute.