Frac sand, also referred to as industrial sand or silica sand, is uniform quartz sand of a specific grain shape and size used for hydraulic fracturing. The grains must be very round and extremely hard in order to work successfully as a proppant for hydraulic fracturing. During hydraulic fracturing, the frac sand is suspended in chemicals and water and then injected into oil and gas wells under high pressure. This causes the frac sand to prop open fractures that are created from the fluid being pumped into the well at high pressure.
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The increased use of frac sand during hydraulic fracturing created a boom in the frac sand mining industry. Specifically, two states that have experienced a large boom in the frac sand mining industry are Wisconsin and Minnesota. As a result, environmentalists have expressed concern for the impact on public health and the environment. Additionally, regulations are being revised to meet the demands and concerns of the frac sand mining industry.
This guide is intended to represent a collection of legal resources relating to frac sand mining. While the Center for Agriculture and Shale Law makes every effort to maintain and update the content furnished in this guide, no warranty or other guarantee is made regarding the timeliness or accuracy of any information provided.
This guide is intended to present a collection of legal resources relating to the topic of frac sand mining. While the Center for Agricultural and Shale Law makes every effort to maintain and update the content furnished in this guide, no warranty or other guarantee is made regarding the timeliness or accuracy of any information provided.
The main characteristics that a proppant must meet include high resistance to pressure and diagenesis, roundness and sphericity, controlled granulometry, high conductivity and low cost. The proppant is the component that ensures conductivity and, thus, the success of the operation. In its use as part of the hydraulic fracturing process, it is recognized as one of the most impactful petroleum innovations of the 21st century. By combining improved drilling techniques and highly sophisticated fracturing designs, current proppant solutions help improve the production capacity of wells, resulting in more oil and natural gas, day after day.
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Silica sand as a proppant
Frac sand is a natural crystalline silica (quartz) sand that is processed from high-purity sandstone. The composition of frac sand differs slightly from other types of sand, since quartz silica grains are a major component of most inter-coastal sands. The difference is that other sands are a mixture of various minerals and rock types, which are less durable than quartz. Frac sand grains are unique in their resistance to crushing, as well as their very round granule shape. This makes them ideal for use in the hydraulic fracturing process.
What is the function of frac sand?
Frac sand plays an important role in the shale fracturing process to release natural gas, oil and natural gas liquids from the rock pores. When high-pressure water injection forces small boreholes to become larger fractures, frac sand keeps those fractures open to continue releasing fossil fuels. When frac sand is used to prop those fractures, it is called "proppant". Fractures must be kept open to prevent them from collapsing and closing the pores from which natural gas and oil are obtained. Therefore, it is extremely important that the proppant be as durable and crush-resistant as possible. The longer the proppant withstands the huge pressure of the fractures, the more oil can be extracted, thus maximizing the efficiency of the well.
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