In the first ten months of this year, technicians at Henan Oilfield applied reverse pressure drive technology to 40 low-efficiency wells in the Second Oil Production Plant, achieving a 90.6% success rate and increasing crude oil output by a total of 2,936 tonnes. This provides an effective solution for improving the performance of low-efficiency wells in mature oilfields.

In oilfield development, the treatment of low-efficiency wells is a key step in enhancing overall production capacity. The conventional blocks of the Second Oil Production Plant at Henan Oilfield have long faced challenges such as poor reservoir properties, weak injection–production connectivity and low formation pressure. These issues hinder effective oil recovery from certain wells, leaving production capacity persistently low and restricting overall block development.

To address these challenges, Henan Oilfield’s technical team conducted a dedicated investigation, systematically reviewing geological data and repeatedly evaluating a range of treatment technologies. Ultimately, they identified reverse pressure drive as the core method for enhancing reservoir energy and displacement efficiency in the block.

Reverse pressure drive is an innovative technology for replenishing reservoir energy and improving oil displacement. It works by injecting large volumes and doses of fluid into the formation to strongly recharge reservoir energy and rebuild the underground flow field, thereby “awakening” the reservoir and efficiently driving out the remaining oil.

To improve field applicability, the technical team adopted a “one well, one plan” approach. Injection parameters and construction schemes were customized for each well based on its geological conditions, energy status and remaining oil distribution. This ensured high treatment success rates and effectively solved the core problem of insufficient reservoir energy. The successful application of this technology provides valuable experience for addressing water injection challenges and energy depletion in mature oilfield blocks across the industry.