In the depths of the Bohai Sea in the past, ancient buried hills sealed billions of years of gas veins in 5000 meters of rock layers; Today, drilling rods penetrate hard rocks and injecting gas to awaken micro cracks, and the 100 billion cubic meter gas field has finally become a stable gas source in the eastern offshore area. With independent technology, it connects the deep energy lifeline, which has profound significance.

Turn the restricted area into a granary

In the central part of the Bohai Sea, beneath a 5000 meter rock formation, the Precambrian buried hill was once considered a forbidden zone for offshore oil and gas development - with a well temperature of 204 ℃, ultra carbon steel hardness, and condensate gas in micro scale cracks. There is no mature experience to copy and no overseas paradigm to borrow from. The first phase of Bozhong 19-6 gas field has been fully put into operation, with a daily oil and gas equivalent of over 5200 tons. It is not the birth of another high-yield well, but rather China's transformation of ultra deep and complex buried hills from a difficult problem in geological textbooks to an independent and controllable production base.

Define development paradigm with independent technology

What is truly worth remembering is not the number 5200 tons, but the ability that has grown on oneself. The breakthroughs in four core technologies, including hard formation drilling technology, high-temperature resistant drilling fluid, the world's first industrial operation of a branch well in the Precambrian buried hill, and cyclic gas injection and stable pressure production, have enabled the Bohai ultra deep well to move from being able to be drilled to being able to be drilled on a large scale and economically. The first phase involves 10 deep wells with a depth of over 6000 meters and an average depth of over 5500 meters, filling a technological gap and establishing a paradigm for independent development of offshore ultra deep layers.

Reconstructing the Eastern Energy Supply Guarantee Pattern

The issue of energy security is never based on whether the total amount is sufficient, but on whether there is a nearby source of support for consumption in the hinterland. China has more natural gas in the west and less in the east. The Beijing Tianjin Hebei region and the Bohai Rim region have long relied on the West East Gas Pipeline and imported LNG. The longer the chain, the more direct the peak valley fluctuations and geopolitical disturbances. Bozhong 19-6 has discovered over 200 billion cubic meters of natural gas, with a cumulative gas production of over 2.8 billion cubic meters. Currently, the daily gas production is stable at 3.5 million cubic meters and is directly supplied to the regional pipeline network. During the summer peak season, it stabilizes the peak and maintains a steady state. For the first time, the eastern sea area has a self owned gas source of billions of cubic meters that can be dynamically adjusted at the entrance of the consumer side.

Longer term leverage is replicable. The gas field adopts overall deployment and phased iteration, and the second phase of drilling has been launched; The complete set of technology and engineering control mode formed by it can be directly translated to complex oil and gas reservoirs of the same type in the Bohai Sea and the eastern region. The operation and maintenance base of the Bohai Oilfield's production exceeding 21 million tons and 40 million tons in the first half of the year is on the side, which means that this is not a single miracle, but the output of the industrial development system. Pry open a crack in the deep buried hill, followed by a new space for oil and gas exploration. Keywords: technological breakthroughs, independent controllability, capacity breakthroughs

The production of Bozhong 19-6 reveals a clear logic: independent energy security, not only increasing storage in distant areas, but also breaking through barriers in nearby waters; Not only do pipelines bring gas from the west, but technology also awakens gas from the east. When the drill bit can penetrate 5000 meters of hard rock, and when gas injection can hold down the sudden phase change of condensate gas, there is an additional chip on the national strategic game table called the deep-sea ballast stone.Editor/Gong Ziwei