When a new well is brought on after hydraulic fracturing, the initial flowback carries a mixture of water, sand, and gas back to surface - and historically that gas was simply vented or flared. A reduced emission completion, commonly called a green completion, is the practice of capturing that flowback gas and routing it to sales instead. This guide explains what a green completion is, how the procedure works, and why it is treated as a specific event rather than routine production.
Reduced Emission Completion (REC) in one line: A reduced emission completion (REC), or green completion, is a procedure that captures the gas produced during a well's flowback after hydraulic fracturing and routes it to a sales line or gas-gathering system rather than venting it, combusting any gas that cannot yet be captured. It is a defined, time-limited event at the start of a well's life, mandated under Quad O for applicable wells, and it uses specialized surface equipment to separate flowback gas from the returning liquids and solids.
After a well is hydraulically fractured, the fluids pumped in during stimulation flow back to surface, and as the well cleans up, gas begins to come with them. In the past, this early flowback gas was hard to send to sales because it came back mixed with water and sand and at variable, sometimes low pressure and quality. The simplest thing was to vent it or send it to a flare while the well cleaned up, which released or burned a slug of gas at the very start of production.
A reduced emission completion tackles this by treating the flowback as something to capture, not discard. The core idea is to bring in equipment that separates the returning gas from the water and solids well enough, and conditions it enough, to put it into a gathering line or sales pipeline. Instead of the completion being a period of pure emissions, it becomes a period of recovered, sold gas - which is both an environmental improvement and a revenue capture.
It is called green because it turns a historically wasteful, emitting phase into a controlled, capturing one. And it is a completion-specific concept: it applies to the flowback and cleanup at the beginning of a well's life, not to the steady-state production that follows.
A green completion relies on portable surface equipment set up at the wellsite for the duration of flowback. Central to it is a separator - often a specialized sand-handling or flowback separator - that takes the multiphase flowback stream and splits it into gas, liquids, and solids. The separated gas is measured and, once it is of adequate pressure and quality, directed into the gathering system or sales line rather than to a vent.
Because the very earliest flowback may be too poor in quality or too erratic to send to sales, a completion combustion device (a flare or combustor) is typically on hand to burn gas that cannot yet be captured, so that even the uncapturable portion is destroyed rather than vented. As the well cleans up and stabilizes, more of the gas becomes suitable for capture, and the procedure transitions the well toward routing everything to sales. The equipment then demobilizes and the well enters normal production.
Throughout, the completion is a distinct, documented operation. The volumes captured, combusted, and any vented are tracked, because for regulated wells this event has specific requirements and recordkeeping. That is part of why a green completion is treated as its own procedure rather than being folded into ordinary production monitoring.
A completion is an intense, temporary operation with a lot happening at once - variable flow, changing pressures, a separator handling sand and liquid, and gas being switched between capture and combustion as quality allows. Keeping track of the gas going to sales, the gas being combusted, separator conditions, and pressures is exactly the kind of real-time picture a control and telemetry system is built to provide during a fast-moving event.
A cloud SCADA platform like Merobix supports the completion by trending the flowback separator's conditions, the captured gas flow to the gathering line, combustor status, and wellhead and line pressures, and by alarming on upsets - a separator problem, a combustor pilot going out, or pressures moving out of range. Merobix does not run the frac or operate the flowback equipment itself, but it gives the crew and remote staff a live, recorded view of the event, which supports both safe execution and the documentation the completion requires.
That recorded view also feeds the after-the-fact accounting. Because a reduced emission completion is judged on how much gas was captured versus combusted or vented, a continuous, time-stamped record of the flows and equipment status during flowback turns the completion into a well-documented event rather than a reconstruction from field notes.
A green completion captures the flowback gas and routes it to a sales or gathering line, recovering it as product. Flaring burns the gas instead. In practice a reduced emission completion uses a combustor to burn only the gas that cannot yet be captured - typically the earliest, poorest-quality flowback - while directing the rest to sales, so it captures as much as possible and combusts the remainder rather than venting.
It happens during the flowback and cleanup period right after a well is hydraulically fractured, as fluids and then gas return to surface. It is a defined, time-limited event at the start of a well's producing life, not part of ongoing production. Once the well cleans up and stabilizes, the temporary flowback equipment demobilizes and the well enters normal production monitoring.
The key piece is a flowback or sand-handling separator that splits the multiphase flowback stream into gas, liquids, and solids so the gas can be measured and routed to a gathering or sales line. A completion combustion device (flare or combustor) is kept on hand to burn any gas that cannot yet be captured. Metering and control equipment track the volumes captured, combusted, and vented.
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