Recently, it has been reported from the Bohai Oilfield that Well A32 in the Bozhong 34-9 oilfield has implemented re-fracturing technology for existing wells for the first time, achieving significantly enhanced oil production.
This single-well, single-layer fracturing operation has set a new fracturing record in the Bohai Oilfield.
As China’s first offshore sandstone oilfield influenced by igneous rocks, the Bozhong 34-9 oilfield features oil-bearing layers resembling “honeycomb coal.” This results in poor reservoir properties, complex connectivity, and ineffective water injection in the peripheral igneous rock zones. The oilfield urgently requires fracturing stimulation to achieve effective production enhancement in such reservoirs.
Collective Wisdom, Shared Solutions:
Marine-Land Collaboration Tackling Complex Challenges
Based on the aforementioned research findings, the multi-stage composite temporary plugging fracturing technology was applied in Well A32 of the Bozhong 34-9 oilfield. However, challenges emerged during the first-stage fracturing operation, as the operational pressure did not rise as expected, resulting in the failure to achieve effective connection between the vertically stacked multi-layer reservoirs.
To ensure the successful implementation of the fracturing operation, the Bohai Oil Research Institute of Tianjin Branch, the Bonan Operations Company, and the Engineering Technology Operations Center collaborated closely. Through land-sea coordination, they conducted analysis and discussions, ultimately determining a solution for the subsequent operations: appropriately extending the pressure decline time and increasing the dosage of temporary plugging agent.
On-site technical personnel immediately conducted numerical simulations to systematically compare fracture geometries under different pressure decline times and the plugging effectiveness with varying dosages of temporary plugging agents. Through this process, the optimal operational parameters were gradually identified, ensuring the smooth progress of field operations. Meanwhile, supported by real-time fracture monitoring and dynamic parameter adjustments, the degree of vertical reservoir stimulation was increased to over 90%, with the stimulated reservoir volume reaching three times that of conventional techniques, significantly enhancing reservoir utilization efficiency.
Stimulating Productivity:
Efficient Re-fracturing Operations
In response to challenges such as the well’s high deviation angle, multiple fracturing layers, low efficiency of sequential layer fracturing, and the high risk of drill pipe sticking in conventional multi-layer fracturing operations within a single trip, the Oilfield Production Department of COSL adopted and successfully implemented the “four-stage in one trip” drag sand fracturing technique. This decision was based on thorough sand filling simulations and practical analysis.
This technique not only enables precise multi-stage fracturing but also prevents sand settling above the packer. Compared to conventional sequential layer fracturing, it improves operation efficiency by over 40%, fully ensuring operational effectiveness.
This high-standard, high-efficiency, and high-quality fracturing operation has further advanced the technological capabilities of volumetric fracturing stimulation and accumulated valuable experience for the efficient development of low-permeability reservoirs in the Bohai Oilfield.
The extraction of oil and natural gas cannot be achieved without separation equipment.
Shanghai Shangjiang Petroleum Engineering Equipment Co., Ltd. established in Shanghai in 2016, is a modern technology enterprise integrating R&D, design, production, and service. We are dedicated to developing separation and filtration equipment for the oil, gas, and petrochemical industries. Our high-efficiency product portfolio includes de-oiling/dewatering hydrocyclones, desanders for micron-sized particles, and compact flotation units. We provide complete skid-mounted solutions and also offer third-party equipment retrofitting and after-sales services. Holding multiple proprietary patents and operating under a DNV-GL certified ISO-9001, ISO-14001, and ISO-45001 management system, we deliver optimized process solutions, precise product design, strict adherence to engineering specifications, and ongoing operational support.
Our high-efficiency cyclone desanders, renowned for their exceptional 98% separation rate, have earned recognition from international energy leaders. Constructed with advanced wear-resistant ceramics, these units achieve 98% removal of particles as fine as 0.5 microns in gas streams. This capability enables the reinjection of produced gas for miscible flooding in low-permeability reservoirs, a key solution for enhancing oil recovery in challenging formations. Alternatively, they can treat produced water, removing 98% of particles larger than 2 microns for direct reinjection, thereby boosting water-flood efficiency while minimizing environmental impact.
Our new product——The High Efficiency Ultra-Fine Particle Desander is a liquid-solid separation device that utilizes an efficient centrifugal principle to separate suspended impurities—such as solids in produced water, seawater, condensate, fine particles in high-viscosity liquids, and catalyst powder in reactors—from fluids (liquids, gases, or gas-liquid mixtures). It effectively removes solid particles with sizes down to 2 microns (at 98% efficiency) or smaller.
The High Efficiency Ultra-Fine Particle Desander delivers high sand removal efficiency, capable of removing solid particles down to 2 microns. The equipment features a compact footprint, requires no external power or chemical additives, and has a service life of approximately 20 years. It offers online sand discharge capability without the need for production shutdown.
Proven in major global fields operated by CNOOC, CNPC, Petronas, and others across Southeast Asia, SJPEE desanders are deployed on wellhead and production platforms. They provide reliable solids removal from gas, well fluids, and condensate, and are critical for seawater purification, production stream protection, and water injection/flooding programs.
Beyond desanders, SJPEE offers a portfolio of acclaimed separation technologies. Our product line includes membrane systems for natural gas CO₂ removal, deoiling hydrocyclones, high-performance compact flotation units (CFUs), shale gas desanding，Cyclonic dewater package with produced water treatment，and multi-chamber hydrocyclones, delivering comprehensive solutions for the industry’s toughest challenges.
Post time: Jan-20-2026