flow of hydrocarbons from the reservoir to the well. The fracturing fluid is engineered to lose viscosity, or “break,” and is subsequently flowed back from the formation, leaving the proppant suspended in the formation fractures. Once our customer has flushed the fracturing fluids from the well using a controlled flow-back process, the customer manages fluid and water recycling or disposal.
Our hydraulic fracturing fleets consist of mobile hydraulic fracturing units and other auxiliary heavy equipment to perform fracturing services. Our hydraulic fracturing units consist primarily of high-pressure hydraulic pumps, engines, transmissions, radiators and other supporting equipment that are typically mounted on trailers. We refer to the group of units and other equipment, such as blenders, data vans, sand storage, tractors, manifolds and high pressure fracturing iron, which are necessary to perform a typical hydraulic fracturing job, as a “fleet,” and the personnel assigned to each fleet as a “crew.” The size of each fleet and crew can vary depending on the requirements of each job design.
We also have wireline operations as a result of the acquisition of Schlumberger’s OneStim business in December 2020, whereby we obtained certain assets and liabilities of the OneStim business including OneStim’s hydraulic fracturing pressure pumping services business in onshore United States and Canada (the “OneStim Acquisition”). Our wireline units consist of a truck equipped with a spool of wireline that is lowered into wells to convey specialized tools or equipment, such as perforating guns and charges, that are necessary to connect the wellbore with the target formation. This operation is performed between each hydraulic fracturing stage. Our wireline service is primarily offered alongside our hydraulic fracturing services, which allows us to maximize efficiency for our customers through optimized coordination of the wireline and hydraulic fracturing services. In addition, we also offer our wireline service on a stand-alone basis.
On October 26, 2021, we acquired Proppant Express Investments, LLC in exchange for $11.9 million in cash and 3,405,526 shares of Class A Common Stock and 2,441,010 shares of Class B common stock, par value $0.01 per share (“Class B Common Stock” and, together with Class A Common Stock, the “Common Stock”), and 2,441,010 units of Liberty LLC (“Liberty LLC Units”), for total consideration of $103.0 million, based on the Class A Common Stock closing price of $15.58 on October 26, 2021, subject to customary post-closing adjustments (the “PropX Acquisition”). The Liberty LLC Units are redeemable for an equivalent number of shares of Class A Common Stock at any time, at the election of the stockholder.
As a result of the PropX Acquisition, we are now a leading provider of last-mile proppant delivery solutions, including proppant handling equipment and logistics software across North America. PropX offers innovative environmentally friendly technology with optimized dry and wet sand containers and wellsite proppant handling equipment that drive logistics efficiency and reduce noise and emissions. We believe that PropX wet sand handling technology is a key enabler of the next step of cost and emissions reductions in the proppant industry. PropX also offers customers the latest real-time logistics software, PropConnect™, for sale or as hosted software as a service.
Our operations are organized into a single business segment, which consists of hydraulic fracturing services, including wireline, proppant delivery and goods, including our Permian Basin sand mines, and we have one reportable geographical segment, North America. We have grown from one active hydraulic fracturing fleet as of December 2011 to over 30 active fleets as of March 31, 2022. We are focused on providing “next-generation” frac fleets and technologies to assist our customers with completing their wells in an ESG-friendly manner.
Our founders and management are pioneers in the development of data-driven hydraulic fracturing technologies for application in shale plays. Prior to founding the Company, the majority of our management team founded and built Pinnacle Technologies, Inc. (“Pinnacle Technologies”) into a leading fracturing technology company. In 1992, Pinnacle Technologies developed the first commercial hydraulic fracture mapping technologies, analytical tools that played a major role in launching the shale revolution. Our extensive experience