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The solids control system plays a vital role in drilling operations. As a high-performance pump applied in solids control systems, the mud shear pump is a type of centrifugal pump mainly used for shearing, dispersion and sufficient hydration of drilling mud.Ordinary sand pumps and centrifugal pumps only serve to transport mud, while the mud shear pump realizes fluid transportation as well as shearing and dispersion, enabling rapid dissolution and dispersion of mud additives. Therefore, great attention shall be paid to the selection of mud shear pumps. I. Selection of Explosion-proof Motor Oilfield drilling sites are flammable and explosive hazardous areas. Ordinary motors may trigger potential safety hazards. For this reason, mud shear pumps are mandatorily equipped with explosion-proof motors to ensure operational safety on site. YB3 series flameproof three-phase asynchronous motor is designed as flameproof construction in compliance with: GB 3836.1-2010 Explosive atmospheres — Part 1: Equipment general requirements GB 3836.2-2010 Explosive atmospheres — Part 2: Equipment protection by flameproof enclosures “d” Explosion protection marks: Ex d I Mb, Ex d II BT4 Gb Operating Conditions 1. Ambient air temperature varies with seasons, with a maximum of 35℃ / 40℃ and a minimum of -15℃. 2. Altitude: no higher than 1000 m above sea level. 3. Rated voltage: 380V, 660V, 380/660V 4. Rated frequency: 50Hz 5. Motor rating is based on S1 continuous duty. 6. Insulation class: Class F 7. Enclosure protection class: IP55 Material and Installation Requirements The motor frame is made of cast iron with anti-corrosion coating, adaptable to corrosive oilfield environments. Standard installation form: B3 (foot-mounted). Customized forms including B5 (flange-mounted) and B35 (foot and flange mounted) are available. II. Selection of Mud Shear Pump The JQB series shear pump is essential equipment in drilling fluid circulation systems. It is mainly applied for treatment of chemical additives and bentonite to achieve rapid preparation of drilling fluid.With a specially designed mud pump impeller structure, the pump generates powerful shear force when fluid flows through, which crushes and disperses solid particles such as chemical additives and bentonite, realizing uniform distribution of solids in drilling fluid. Field application data shows that mud treatment with shear pumps can reduce bentonite consumption by over 20%. Meanwhile, it significantly improves fluid filtration performance and mud quality, forms favorable gel strength, effectively protects wellbores and prevents oil reservoir contamination, and greatly enhances cuttings carrying capacity of drilling fluid under low shear rate conditions. The JQB6×5J mud shear pump is a large-flow mud mixing device dedicated to solids control systems. It adopts large-diameter flow channels with 6-inch inlet and 5-inch outlet, together with a high-shear sand pump impeller structure. It reduces raw material consumption and improves drilling fluid quality, and is widely applied to onshore drilling operations and mud mixing systems. Two models are available in this series:JQB6×5J-45 and JQB6×5J-55  Both models are equipped with YB3 series flameproof explosion-proof motors. TECHNICAL PARAMETERS Item JQB6×5J-45 JQB6×5J-55 Model JQB6×5J-45 JQB6×5J-55 Capacity 120 m³/h 150 m³/h Head 28m – 32m 32m – 38m Shearing Efficiency 95% 95% Motor Power 45 kW 55 kW Impeller Speed 2200 rpm 2200 rpm Inlet Diameter 6" 5" Outlet Diameter 5" 5" Weight 780 kg 900 kg Overall Dimensions 1200mm × 1000mm × 1450mm 1250mm × 1000mm × 1470mm Model Meaning JQB: Series code of shear pump 6×5: 6-inch inlet diameter, 5-inch outlet diameter J: Mechanical seal structure 45: 45kW explosion-proof motor configured 55: 55kW explosion-proof motor configured Selection Basis 1.According to mud mixing capacity For conventional drilling with medium mud preparation volume: JQB6×5J-45 For large mud volume, sand-laden mud and deep-well drilling conditions: JQB6×5J-55 (55kW) 2. Material and Seal Requirements Sand pump casing and sand pump impeller are made of high-chromium wear-resistant cast iron to resist abrasion from sand-containing mud. Special oilfield mechanical seals are adopted for excellent corrosion resistance. 3.Performance Requirements 10% safety margin is reserved for flow rate and head. Sufficient power margin is reserved for the motor to avoid overheating during long-term continuous operation.  

A drilling mud shear pump is a high-shear mixing device specifically designed for drilling mud treatment. It crushes and disperses solid particles in the mud through mechanical forces (shearing, impact, and turbulence) while promoting the full dissolution of additives such as polymers and clays. Ultimately, it achieves mud homogenization, rheological optimization, and performance enhancement. Ⅰ. Core Functions Crush large solid particles in the mud (e.g., cuttings, undispersed clay) to reduce particle agglomeration. Accelerate the dissolution and activation of chemical additives such as polymers, fluid loss reducers, and viscosifiers. Improve the viscosity, shear force, and rheological properties of the mud, enhancing its ability to suspend cuttings, inhibit wellbore collapse, and cool the drill bit. Maintain the stability of the mud system, ensuring efficient cuttings carrying, well pressure balancing, and drill string lubrication during circulation. Ⅱ. Working Principle The core principle of a drilling mud shear pump lies in generating intense shear forces and hydrodynamic effects through the high-speed relative motion between the rotor and stator. The specific process is as follows: 1.Shearing Action: A small gap (shear gap, typically 0.1–1mm) exists between the rotor (high-speed rotating component) and the stator (fixed component). As mud passes through this gap, it is "sheared" by the high-speed rotating rotor, tearing large particles into smaller ones. 2.Impact and Turbulence: The high-speed rotation of the rotor blades drives the mud to generate intense turbulence and vortices. High-frequency impacts occur between particles and between particles and blades, further crushing particles and dispersing additives. 3.Mixing and Homogenization: Under the combined effect of shearing and turbulence, solid particles, liquids, and additives in the mud are fully mixed, forming a uniform and stable system to prevent stratification or sedimentation. Ⅲ. Structural Composition The structure of a drilling mud shear pump is designed to meet requirements such as high shear efficiency, wear resistance, and adaptation to harsh working conditions. It mainly consists of the following components: 1. Power Drive System Drive Source: Typically an explosion-proof motor (for onshore drilling) or a hydraulic motor (for offshore drilling, adapted to high-vibration environments), providing rotational power. The power range varies from tens to hundreds of kilowatts, matched according to processing capacity. Reduction/Transmission Device: Transmits power to the rotor through couplings, gearboxes, etc., and adjusts the rotor speed (usually 1000–3000rpm; higher speeds improve shear efficiency). 2. Core Working Components: Rotor and Stator Rotor: The "active component" of the shear pump, mostly cylindrical with spiral blades or tooth-like protrusions on its surface. Blade materials must be wear-resistant (e.g., high-chromium cast iron, tungsten carbide coating) to withstand scouring by hard particles in the mud. Stator: The "passive component," fixed in the pump housing and coaxially assembled with the rotor. Its inner wall is designed with grooves or channels matching the rotor blades. The gap between the rotor and stator can be controlled by adjusting structural parameters; a smaller gap enhances shear force (but risks blockage must be avoided). 3. Fluid Channel System Inlet: Connected to mud tanks or circulation pipelines, through which mud is drawn into the shear chamber by pump suction or external force. Shear Chamber: The space between the rotor and stator, serving as the core area where mud undergoes shearing and impact. Outlet: Through which the treated homogenized mud is discharged, returning to the circulation system or proceeding to the next processing step. Flow Guide Structure: Some shear pumps are equipped with built-in guide plates or spiral channels to guide axial mud flow, avoiding local stagnation and improving mixing uniformity. 4. Auxiliary and Protection Systems Sealing Device: Uses mechanical seals or packing seals to prevent mud leakage (especially under high pressure) and protect the drive system from mud contamination. Cooling System: For high-power pumps, water cooling or air cooling reduces the operating temperature of the rotor and stator, preventing material aging caused by frictional heat. 5. Control System Equipped with frequency converters, pressure sensors, flow meters, etc., it can real-time adjust speed, monitor inlet/outlet pressure and flow, and adapt to the processing needs of different mud types (e.g., water-based mud, oil-based mud). Ⅳ. Core Technical Features High Shear Efficiency: By optimizing rotor and stator structures (e.g., multi-group tooth engagement, stepped shear gaps), particle refinement efficiency exceeds 90%, and additive dispersion speed is increased by 30%–50%. Wear-Resistant Design: Key components use wear-resistant alloys (e.g., Cr12MoV), rubber linings, or ceramic coatings to extend service life (in abrasive formation drilling, service life can be 2–3 times that of traditional pumps). Strong Adaptability: Capable of handling high-viscosity, high-sand-content mud (sand content ≤15%) and compatible with water-based, oil-based, and synthetic-based muds. Stable Continuous Operation: Designed for continuous working mode with a wide processing flow range (10m³/h to 500m³/h), meeting the needs of different drilling scales (e.g., shallow wells, deep wells, horizontal wells). Ⅴ. Application Scenarios and Importance Drilling mud shear pumps are widely used in oil and gas drilling, shale gas development, geological exploration, etc., with specific scenarios including: 1. Drilling Mud Preparation Stage In mud tanks, shear pumps mix bentonite, clay, and other base materials with water, while adding polymers (e.g., polyacrylamide), fluid loss reducers (e.g., CMC), and other additives. Shearing ensures full dissolution of additives, avoiding undissolved polymer lumps, and provides qualified initial mud for drilling. 2. Drilling Circulation Process During drilling, returned mud carries a large amount of cuttings and drill debris. Shear pumps can crush large cuttings to prevent sedimentation in mud tanks; when 补充添加剂，shearing quickly restores mud viscosity and suspension capacity, maintaining stable circulation. 3. Regeneration of Degraded Mud For mud with degraded performance due to long-term circulation (e.g., reduced viscosity, poor suspension), shear pumps can re-disperse particles and reactivate additives through re-shearing, realizing mud regeneration, reducing waste discharge, and lowering new mud preparation costs. 4. Special Drilling Technology Requirements In complex well types such as directional wells and horizontal wells, higher rheological requirements are imposed on mud (e.g., low viscosity, high cuttings carrying capacity). Shear pumps can optimize mud rheological parameters by precisely controlling shear intensity, ensuring wellbore trajectory control and cuttings carrying efficiency. Ⅵ. Selection and Maintenance Guidelines 1. Key Selection Parameters Processing Flow Rate: Determined by drilling fluid circulation volume, usually 1.2–1.5 times the drilling pump displacement. Shear Intensity: Select rotor-stator structures based on mud type (e.g., high shear for finely dispersed mud, strong crushing for coarse-particle mud). Working Pressure: Adapt to mud circulation system pressure (typically 0.5–2MPa) to avoid overload. Corrosion Resistance: For oil-based mud or chemically additive-containing mud, acid- and alkali-resistant materials (e.g., 316 stainless steel) are required. 2. Daily Maintenance Focus Regularly inspect rotor and stator wear; replace when the gap exceeds 50% of the initial value to prevent reduced shear efficiency. Clean the inlet filter to prevent blockage or component damage caused by large impurities entering the shear chamber. Check for leaks in sealing devices and replace seals promptly to protect the drive system. Regularly lubricate transmission components to ensure stable operation and reduce energy consumption. Ⅶ. Conclusion Drilling mud shear pumps achieve mud homogenization and performance optimization through high shear forces, serving as core equipment connecting mud preparation, circulation, and regeneration. Their advanced design, rational selection, and standardized maintenance directly affect drilling efficiency, wellbore safety, and cost control. As oil and gas exploration advances to deep and complex formations, efficient, wear-resistant, and intelligent shear pump technology will become a key support for enhancing the competitiveness of drilling engineering.