Completions: Squeezing Out More Recovery
Completion engineers feel pressure to maximize production per acre and minimize the downsides of fracturing in tight spaces. Terry Palisch, talks about promoting knowledge sharing as part of JPT’s tech director report.
Editor’s note: This is the second in a series of articles in which SPE’s technical directors comment on the state of their industry sector heading into 2019.
The downside of a job that has become more important is that it often means the work has gotten harder. Completion engineers are in the midst of a debate over how to deliver more oil per acre from unconventional plays where operators are making huge bets on their long-term development plans.
Fracturing made shale development possible, and advances in completion designs have made wells more productive. SPE technical papers tracked and facilitated those changes, including longer laterals, tighter stage and perf-cluster spacing, increased proppant and water use per foot of lateral, and tighter well spacing.
“It’s all about how to effectively and optimally contact as much rock as possible,” said Palisch, of Carbo Ceramics, who is taking on the position of SPE Technical Director for Completions. “Finding ways to economically increase recovery is of paramount importance.”
The focus is on maximizing the value of the tools of fracturing—ensuring that perforation clusters all contribute using techniques such as diversion to even the flows—plus tighter perf and stage spacing. And control stimulation to effectively fracture a defined area.
Field development presents a seemingly simple math problem, which turns out to be quite complex because there are so many variables in play.
Total production per section is equal to the number of wells times the total production per well. Experience has shown that maximizing the number of wells by extremely tight spacing often leads to less production per well due to well-to-well interference. Wider spacing can limit that problem, but it means fewer wells, thereby reducing overall production.
Engineers are debating how best to space, complete, and produce wells to maximize the total. SPE’s role in this is: “Let’s promote an exchange of ideas,” he said. There will be a panel discussing Frac Hits, Well Spacing, and the Science (and Art) of Infill Drilling in Unconventionals at the upcoming SPE Hydraulic Fracturing Technology Conference in The Woodlands, Texas.
In early April, there will be a workshop whose title says it all: Well Completions for Unconventional Resource Development Optimization and Parent Child Interaction.
Better completions will require a focus on doing more to observe and understand the process to improve performance from improved designs, diagnostics, and data use.
This is fertile ground for research and development, and doing better will require cooperative work among experts. Palisch added, “We need multidisciplinary teams working together on how we optimally complete the well.”