These are wells drilled to fill in between established producing wells to increase production. Infill drilling optimization is a crucial aspect of the economic development of oil and natural gas fields. When an oil or gas reservoir is discovered, the operator needs to plan on how best to recover as much of the original gas or oil in place within the reservoir. Knowledge about the reservoir is gleaned from the wellbore, and the reservoir’s extent is based on prior geological and geophysical information until other wells are drilled to prove the lateral extent of the reservoir. It will take too many years for a single well to cost-effectively drain a reservoir. Drilling additional wells is necessary for efficient and optimal recovery of gas and oil from any reservoir. There is an optimal distance between each well such that they will not interfere with each other’s ability to produce efficiently. Known as well spacing, this distance is usually expressed in acres, and is known as infill drilling