Recently, in the Guoxin Energy Storage and Power Generation Project undertaken by the Magnetic Guidance Team of the Engineering Technology Research Institute, the An26-2 well achieved one-time re-entry into the old cavity operation, marking the innovative application of MGD passive magnetic guidance technology in the field of compressed air energy storage by the Engineering Technology Research Institute.
The Guoxin Energy Storage and Power Generation Project is currently the largest and most efficient compressed air energy storage project under construction in China. The target vertical well for this implementation has a minimum radius of 27 meters for the bottom old cavity. Drilling the injection production directional well An 26-2 near the target well requires precise control of the wellbore trajectory before entering the old cavity, and current general technology is difficult to meet project requirements.
The passive magnetic guidance technology team bravely took on the heavy responsibility and faced new technical challenges such as high conductivity of salt water, salt layer shielding excitation, and continuous underground interference. Technical experts focused on technical difficulties, conducted field surveys of adjacent wells, utilized successful experience, repeatedly optimized the plan, and developed a wide differential domain magnetic guidance probe tube with targeted research and development. In one fell swoop, they overcame technical problems such as high conductivity in salt layers, interference in measurement data, and non centering of conventional probes in large wellbores.
In on-site operations, the anti-interference ability of wide differential field magnetic guided probes is significantly enhanced compared to conventional probes. Technicians used the target well to release stimulation, thereby eliminating the interference of disordered electric fields in saline water and achieving high-precision measurement in the salt layer environment. Successfully identified and captured the target signal in a short period of time, accurately predicted that the target well would re-enter the old cavity at 1276 to 1278 meters, and the actual error was less than 2 meters.
Next, the magnetic guidance team of the Engineering Technology Research Institute will continue to make breakthroughs in MGD passive magnetic guidance technology in practical operations, contributing technical strength to national engineering construction projects.
