How to choose the right model desanding unit for TBM trenchless project

When selecting the right model of a desanding plant for trenchless project, it’s important to address key operational parameters and customer concerns to ensure optimal performance. A thorough analysis of the problem, along with understanding the specific operational requirements, will guide the solution.

One customer feedbach that the 500GPM for their new piling rig looks not performance well. They want to know what is the problem and how to address it.

Slurry Overflow: If the issue is related to inadequate processing capacity, causing slurry to overflow from the shaker screen, it suggests that the desanding plant is not handling the required flow rate.

Insufficient Separation Efficiency: If the complaint is regarding minimal differences in mud specific gravity before and after treatment, this indicates that the separation efficiency is not meeting the required standards, likely due to improper shaker screen selection or operational parameters.

Key Operational Parameters to Verify
To resolve these issues, it’s crucial to check the flow rate of the client’s mud pump. The processing capacity of the desanding plant should be carefully matched with the mud pump flow rate. If the system capacity is significantly lower than the pump flow, slurry overflow will occur. This balance ensures that the desanding plant can efficiently process the slurry without underloading or overloading.

GNMS-500D mud desaning unit Technical Specifications
For example, the GNMS-500D desander plant is designed to handle a maximum processing capacity of 500 GPM. It comes with a double deck screen shale shaker setup, including a 1mm coarse screen and a 0.3mm fine screen under the cyclone, which are crucial for separating coarse and fine solids.

Solution for Improving Separation Performance
If the desanding plant’s capacity is adequate but the goal is to reduce the gravity or solids content of the separated liquid, a finer mesh screen can improve separation efficiency. The following screen options can be considered:

Coarse Screen Options: API 20, API 40, or API 60
Fine Screen Under Cyclone: API 40, API 60, or API 80
It’s important to note the trade-off when choosing finer mesh screens. While finer screens offer better liquid clarity and more effective solids removal, they can reduce processing capacity. The finer the mesh, the slower the processing rate, so the right balance must be struck between liquid clarity and throughput.

In summary, addressing the specific complaint and aligning the desanding plant’s capacity with the pump flow, while carefully selecting the appropriate screen mesh, will optimize performance and ensure the required separation efficiency.

1000HP Drilling Rig Mud Tank System running in Yunan

GN Solids Control recently completed the installation of a 1000HP drilling mud system at a rig site in Yunnan Province, China. The system is designed to handle the demands of high-performance drilling operations, featuring a comprehensive range of equipment to ensure efficient mud treatment and solids control.

The system consists of four mud tanks, providing ample capacity for the handling and treatment of drilling fluids. The key components of the system include:

Three GNZS594K drilling mud shale shakers: These are four-panel linear motion shale shakers, designed to efficiently separate large solids from the drilling mud. GN Solids Control also offers dual-motion and double-deck shale shaker models as optional upgrades, allowing for more versatile operations depending on the specific needs of the rig.

One GNZCQ270 vacuum degasser: This unit is a self-suction shale shaker, eliminating the need for an additional 75kW feeding pump. It plays a crucial role in removing gases from the drilling fluid, helping to maintain the stability and quality of the mud.

One GNZJ752K-2S desander mud cleaner: Equipped with a two-panel mini-size shale shaker and two 10-inch desander cones, this mud cleaner efficiently separates larger solids from the mud, ensuring the drilling fluid remains at optimal viscosity and density.

One GNZJ752K-12N desilter mud cleaner: Similar in design to the desander unit, this mud cleaner features a two-panel mini-size shale shaker and twelve 4-inch desilter cones, which further refine the mud by removing finer solids, ensuring high-quality drilling fluid.

One GNLW452D middle-speed big bowl decanter centrifuge: This centrifuge is designed for effective fine solids separation, ensuring the efficient treatment of drilling fluids and the removal of ultra-fine particles that cannot be captured by the previous stages.

In addition to these core components, GN Solids Control also provided a range of accessories, including mud agitators, centrifugal pumps, mixing hoppers, and an electrical control system to ensure the system operates smoothly and efficiently.

This comprehensive drilling mud system, tailored to the needs of the Yunnan rig site, ensures efficient solids control and mud management, ultimately enhancing the performance and sustainability of the drilling operations.