Skidded Equipment for Treatment of Drilling Fracturing Wastewater  1. Overview  The fracturing flowback fluid is primary pollution source to water in oil field,Website:http://www.dhpetrotools.com, which contains various chemical substances, such as tackifier, crosslinker, gel breaker and surfactant, has high viscosity, COD and strong stability, especially the tackifier contains natural guanidine gum, thus to make it difficult to treat the flowback fluid to meet the standard requirement on COD value.  2. Process of modular equipment for treatment of fracturing flowback fluid  The basic process of modular equipment for treatment of fracturing flowback fluid is: dosing and mixing of flowback fluidsettlement treatment of inclined tubemechanical filtering treatmentUV sterilization treatmentstorage or reinjection of production water.  (2) Special treatment process  It is optimized to form three modular treatment processes of flowback water reinjection, recycling and discharge as required, with a treatment capacity of ≥20m3/h.Main Technical StandardsReinjectionThe reinjected water shall comply with the Recommended Indexes and Analysis Methods for Injected Water Quality of Clastic Rock Oil Reserves (SY/T5329-2012).RecyclingThe recycled water shall comply with the Recommended Practices for Fracturing Fluid Preparation and Returning Fluid Recycling of Unconventional Oil-Gas Well (Q/SH 0444-2011).DischargeIntegrated Wastewater Discharge Standard (GB8978-1996);Identification Standards for Hazardous Wastes (GB5085.1-5085.2-1996);Standard for Pollution Control on the Storage and Disposal Site for General Industrial Solid Wastes (GB18599-2001);Test Method Standard for Leaching Toxicity of Solid Waste (GB5086.1-1997);Water Pollution Prevention and Control Law of the People's Republic of China.Examples of Site Application(Comparison of Pictures Before and After Sewage Treatment)Analysis on Water Quality Before and After TreatmentWell No.ConditionspHSS/mg·L-1Total Iron/mg·L-1Oil/mg·L-1Total Hardness/mg·L-1Al/mg·L-1Jiaoye HFFlowback fluid5.65623.767.1414.112.8Purified water7.24.32.11.6212-Recycling standard6~8≤10≤20≤10≤500≤1Characteristics of flowback fluid: the suspended matters, total iron, oil content and Al are out of limits except the total hardness, and the fracturing fluid may be prepared after the flowback fluid is treated. The compound flocculant is added during the treatment on site for flocculation and solid-fluid separation, and then the absorption treatment shall be carried out to make the water quality meeting technical index requirements for preparation of fracturing liquid.  Dosing Fluid PerformanceWater SampleAppearance:Density(g．cm-3)Apparent Viscosity (mPa．s)Anti-swelling Rate/%Surface Tension (mN．m-1)Interfacial Tension (mN．m-1)Field Drag Reduction Rate/%Fresh waterColourless1.0168522.2461.123-Purified WaterColourless1.0959120.0851.00375Formula0.1% drag reducer +0.3% compound anti-swelling agent + 0.1% compound synergist + 0.02% defoamerWater SampleAppearance:pH ValueDensity/(g．cm-3)Apparent Viscosity (mPa．s)Fresh waterColourless71.0356Purified WaterColourless71.1252Formula0.3% low molecular thicker + 0.3% rheological agent + 0.15% compound synergist + 0.05% viscosity regulator S + 0.02% defoamerThe treated water may be used for preparing drag reduction water and glue solution with good performance.Application EffectWater SampleAppearance:pH ValueDensity(g．cm-3)Apparent Viscosity/(mPa．s)Anti-swelling Rate/%Drag Reduction Rate /%Purified WaterColourless71.0598873Technical indexesColourless71.00-1.105-20≥8065-75The prepared fracturing fluid conforms to the engineering standard and completely meets the construction requirements on site.