What is the Cluster Selective Perforation Technique？

The Cluster Selective Perforation is the core control unit of the perforating system; it enables precise, multi-stage, multi-zone, and multi-cluster perforation in a single run. Using digital encoding, downhole addressing, and real-time monitoring, it independently fires each cluster-directionally or azimuthally-on command from the surface selection software, integrating bridge-plug setting, perforating, and fracturing into one seamless operation.

The technical core of the cluster selection and firing module lies in "selection and firing" control, that is, to control the ignition sequence and time of the perforating gun cluster through electronic or mechanical means. The basic working principle includes:

◆ Electronic Selective Distribution

The encoded signal is sent through the ground control system. After receiving it, the module decodes it and triggers the perforating gun of the designated cluster. Remote, real-time and flexible ignition control can be achieved.

◆ Modular & Wire-Free Design

Adopting a modular design, the core components such as the perforator and the detonator compartment are standardized. More advanced is the wire-free internal connection technology, which replaces the traditional complex internal connection wires through structures such as disc-shaped contacts, spring frame positioning devices and styluses. This not only simplifies on-site assembly, reduces labor intensity and error risk, but also enhances the overall sealing performance and pressure-bearing capacity by reducing the side openings on the gun body.

◆ Directional Clustering

The eccentricity problem caused by the self-weight of the perforator in horizontal wells has been solved. Through special design, the perforating projectile is oriented towards the main production layer. This enables the subsequent fracturing fluid to act to the maximum extent on the optimal production layer, better form a complex fracture network, and significantly increase the production of a single well.

◆ Inter-Cluster Sealing

After completing the perforation of one cluster, it is necessary to ensure effective isolation between the current cluster and the next cluster before staged fracturing can be carried out. The cluster selection module integrates a reliable inter-cluster sealing isolation process, ensuring effective sealing inside the pipe string under high-pressure operating conditions, providing necessary conditions for the successful implementation of staged fracturing.

◆ Mechanical Selection & Distribution

Inter-cluster ignition is achieved through pressure, time or mechanical devices, and is usually applied in situations with high requirements for environmental adaptability.

◆ Mixed Control

Combining electronic and mechanical methods to enhance reliability and flexibility.

Modules usually feature high anti-interference, high temperature and high pressure resistance, and shock resistance, and can adapt to the complex underground environment.

 

A-One Oil Cluster Selective Perforation

 

● Modularization + No Wire Contacts- A shift from the traditional multi-wire harness structure to a "building block" style of rapid assembly, significantly reducing assembly difficulty and on-site error rates. 

● Digital Selection & Real-Time Monitoring-By adopting digital coding, underground addressing, and full-process monitoring, intelligent and traceable selection and distribution are achieved.

● High-Pressure & High-Temperature Materials-Develop high-temperature resistant alloys, composite material bridge plugs and sealed cables to enhance the reliability of deep well operations.

● Stage-and-Cluster Optimization Software- Combining full-row acoustic logging, seam network index and principal stress analysis, Automatically determine the distribution pattern and quantity of perforation clusters, implementing the "design-execute-interpret" loop.

● Electronic Detonators & Staged Detonation-The electronic control module replaces traditional detonators, achieving low-voltage detonation, anti-interference, and long-distance ignition, further enhancing safety and operational efficiency.

The Cluster Selective Perforation and development module is an important technical equipment in the field of petroleum logging and perforation. Through precise and flexible perforation control, the efficiency, safety and economy of perforation operations have been significantly enhanced. It is widely used in staged fracturing of horizontal Wells, multi-layer system development and complex well condition operations, and is a key tool for the efficient development of modern oil and gas reservoirs. In the future, with the development of intelligent and highly integrated technologies, cluster selection and development modules will play a more important role in oil and gas exploration and development.

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