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It is known that Cr 2O 7 in acid wastewater containing chromium

Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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It is known that Cr 2O 7 in acid wastewater containing chromium
Hydraulic fracturing - Wikipedia
Hydraulic fracturing - Wikipedia

Hydraulic fracturing,, also called fracking, fracing, hydrofracking, fraccing, frac'ing, and hydrofracturing, is a well stimulation technique involving the ,fracturing, of bedrock formations by a pressurized liquid. The process involves the high-pressure injection of "fracking ,fluid," (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore ...

Water Topics | Environmental Topics | US EPA
Water Topics | Environmental Topics | US EPA

When the water in our rivers, lakes, and oceans becomes polluted; it can endanger wildlife, make our drinking water unsafe, and threaten the waters where we swim and fish. EPA ,research, supports efforts under the Clean Water Act and Safe Drinking Water Act.

Investigation of the Factors Influencing the Flowback ...
Investigation of the Factors Influencing the Flowback ...

Based on the established ,model, and fitted capillary pressure, the ,flowback, behavior and relevant influencing factors of the shale gas were investigated. The results show that the ,flowback, ratio is inversely proportional to the clay content of the shale. A high salinity ,fracturing fluid, or a surfactant solution can increase the ,flowback, ratio.

The effect of hydraulic flowback and produced water on ...
The effect of hydraulic flowback and produced water on ...

20/4/2017, · Hydraulic ,fracturing fluid, are complex mixtures containing high concentrations of salts (up to 330,000 ppm), organic, and metal contaminants. However, little …

Mehmood: Numerical simulation of innovative fracking ...
Mehmood: Numerical simulation of innovative fracking ...

In the first phase of ,research,, a fictive ,model, for a gas reservoir is developed to observe the phase change of injected ,fluid,. The ,model, details are provided in Table 1. Since the thickness of created vertical fractures is normally only a fraction of an inch, the ,model, is given a small y-dimension of 0.5 m. Grid blocks with small width help to ...

Water Topics | Environmental Topics | US EPA
Water Topics | Environmental Topics | US EPA

When the water in our rivers, lakes, and oceans becomes polluted; it can endanger wildlife, make our drinking water unsafe, and threaten the waters where we swim and fish. EPA ,research, supports efforts under the Clean Water Act and Safe Drinking Water Act.

A study of the mechanism of nonuniform production rate in ...
A study of the mechanism of nonuniform production rate in ...

flowback, data to study the distribution of ,fracturing fluid, for an individual ,fracturing, stage. Based on gas tracer technology, Miao et al29 analyzed the characteristics of the gas production profile of the MFHWs in shale gas. Although scholars have carried out a lot of work, there is still a lack of systematic ,research, on the mechanism of

International Journal of Oil Gas and Coal Technology ...
International Journal of Oil Gas and Coal Technology ...

To ,research, the relationship between ,flowback, capability and complexities of fracture and seepage pore, characterizing methods including Micro-CT and mercury intrusion porosimetry (MIP) were used. The results show that ,flowback, capabilities of complex structural seepage pores and fractures were low.

International Journal of Oil Gas and Coal Technology ...
International Journal of Oil Gas and Coal Technology ...

To ,research, the relationship between ,flowback, capability and complexities of fracture and seepage pore, characterizing methods including Micro-CT and mercury intrusion porosimetry (MIP) were used. The results show that ,flowback, capabilities of complex structural seepage pores and fractures were low.

Water Topics | Environmental Topics | US EPA
Water Topics | Environmental Topics | US EPA

When the water in our rivers, lakes, and oceans becomes polluted; it can endanger wildlife, make our drinking water unsafe, and threaten the waters where we swim and fish. EPA ,research, supports efforts under the Clean Water Act and Safe Drinking Water Act.

Application of a New Compositional Model for Hydraulic ...
Application of a New Compositional Model for Hydraulic ...

A gas component (CO 2) is added to ,fracturing, fluids in tight gas wells of South Texas in order to energize, or stimulate the invaded zone for improved ,flowback,. It was observed that traditional ,fracturing, fluids were being trapped because of the lack of drawdown pressure caused by depletion of the reservoir.

Hydraulic fracturing - Wikipedia
Hydraulic fracturing - Wikipedia

Hydraulic fracturing,, also called fracking, fracing, hydrofracking, fraccing, frac'ing, and hydrofracturing, is a well stimulation technique involving the ,fracturing, of bedrock formations by a pressurized liquid. The process involves the high-pressure injection of "fracking ,fluid," (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore ...

Processing and Recycling of Waste Flowback Fracturing ...
Processing and Recycling of Waste Flowback Fracturing ...

Hydraulic ,fracturing, is extensively used in the petroleum industry to enhance well productivity. However, the discharge of ,flowback fracturing, fluids after ,fracturing, brings out significant environmental challenges. ,Flowback, fluids usually contain p

Establishment and application of flowback model of ...
Establishment and application of flowback model of ...

The ,flowback, of the ,fracturing fluid, after treatment is significant parts of hydraulic ,fracturing,.The appropriate ,flowback, step may make great contribution to the fracture flow conductivity.This paper focused on the researches of the fracture propagation,,fracturing, fliud transportation,,fracturing fluid, loss property,fracture closure and mathematical ,model, of the ,flowback, procedure.According to ...

Multiphase flow models for hydraulic fracturing technology ...
Multiphase flow models for hydraulic fracturing technology ...

The entire process of fracture placement and ,flowback,/cleanup can be conventionally split into the following four stages: (i) quasi-steady state effectively single-phase suspension flow down the wellbore, (ii) particle transport in an open vertical fracture, (iii) displacement of ,fracturing fluid, by hydrocarbons from the closed fracture filled with a random close pack of proppant particles, and, finally, (iv) highly …

Reuse of Flowback Fluids as Hydraulic Fracturing Fluids in ...
Reuse of Flowback Fluids as Hydraulic Fracturing Fluids in ...

The main objectives of this paper are to: (a) to investigate the feasibility of using produced water in hydraulic ,fracturing, in sandstone fields at reservoir temperatures, (b) introduce new techniques to evaluate the ,flowback fluid, and to purify/qualify produced water at high temperatures, and (c) study the use of chelating agents to expand the acceptable range of TDS in ,fracturing, base fluids.

International Journal of Oil Gas and Coal Technology ...
International Journal of Oil Gas and Coal Technology ...

To ,research, the relationship between ,flowback, capability and complexities of fracture and seepage pore, characterizing methods including Micro-CT and mercury intrusion porosimetry (MIP) were used. The results show that ,flowback, capabilities of complex structural seepage pores and fractures were low.

Mehmood: Numerical simulation of innovative fracking ...
Mehmood: Numerical simulation of innovative fracking ...

In the first phase of ,research,, a fictive ,model, for a gas reservoir is developed to observe the phase change of injected ,fluid,. The ,model, details are provided in Table 1. Since the thickness of created vertical fractures is normally only a fraction of an inch, the ,model, is given a small y-dimension of 0.5 m. Grid blocks with small width help to ...

The Natural Degradation of Hydraulic Fracturing Fluids in ...
The Natural Degradation of Hydraulic Fracturing Fluids in ...

The Hydraulic ,Fracturing, Process The process of hydraulic ,fracturing, involves drilling both vertically and horizontally as shown in Figure 1.3 (NCPA 2013). In the hydraulic ,fracturing, process, a well is drilled into the deep subsurface until it reaches shale rock usually at a …

Hydraulic fracturing - Wikipedia
Hydraulic fracturing - Wikipedia

Hydraulic fracturing,, also called fracking, fracing, hydrofracking, fraccing, frac'ing, and hydrofracturing, is a well stimulation technique involving the ,fracturing, of bedrock formations by a pressurized liquid. The process involves the high-pressure injection of "fracking ,fluid," (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore ...

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