FORT MYERS, Fla. — John Henry and Tom Werner have owned the Red Sox for 15 years now. They have celebrated three World Series championships and improved the look and feel of Fenway Park along the way.

That stewardship created a franchise with a value perhaps three times the $700 million Henry, Werner, and their partners paid in 2001.

On Friday, as the Red Sox had their first full-squad workout of spring training, Henry and Werner said they planned to own the team well into the future.

Henry, 67, finds the Red Sox a worthwhile experience even after all this time.

“We really are focused on that fourth ring, as much as we were focused on the first,’’ he said. “Anything short of that is, I think we would say, is a limited success.

“We talk about how long we can do this, not when we should stop.’’

For Werner, 66, there is no horizon in his view.

“We hope to be healthy and focused for a long, long time,’’ he said. “We know that nothing is forever. Hopefully we’ll be having these conversations for 10 or 15 more years.

Fenway Park isn’t going anywhere, either. Henry said ownership doesn’t feel a need to even consider a new stadium.

“It’s been sort of built to last,’’ he said. “Built to last for the next at least 30 years, if not 50 years. I don’t think we’ll see a lot of changes.’’

What could change is the area around Fenway. The Red Sox own several properties in the neighborhood that could be used for team-related purposes.

“I think you’ll see probably more changes outside the ballpark,’’ said Henry, who also owns the Globe. “Substantive, big changes.’’

The Red Sox’ team offices are small and cramped, and the same is true of the home clubhouse. Moving some of the operation to a nearby spot could help alleviate that.

“We might move our offices outside of Fenway Park and open that space up for more fan improvements,’’ Werner said. “There are blueprints somewhere.’’

Such projects are years away from fruition, but are indeed in the planning stages, according to team president Sam Kennedy.

Werner also is making an impact outside the franchise. He is a member of Major League Baseball’s competition committee and a committed advocate of improving the pace of play.

He predicted more changes will be made, “to make the game more crisp.’’

One proposal being considered for this season is making intentional walks automatic and not requiring four pitches. MLB also is trying to shorten delays for instant replay.

In the lowest level of the minor leagues, baseball will experiment with ending extra-inning games in a more timely fashion by starting innings with a runner on second base.

Werner favors such experiments, even if they aren’t incorporated into the majors.

“Nobody wants a 17-inning game where you waste all your pitchers and you bring in a shortstop to pitch the 17th inning,’’ he said. “We’re having a lot of conversations.’’

Players and front office officials will be included in those discussions. Werner also believes baseball could change the length and placement of commercial breaks for televised games.

“I’d be for less commercial breaks,’’ he said. “I think that increases the ratings. I think that’s a good idea.’’

The owners’ first season, 2002, was the last time the Red Sox did not have David Ortiz on their roster.

“I’ve been thinking about that all week,’’ said Henry. “It is strange. We miss him at our level.’’

Werner led a contingent of team officials to the Dominican Republic last month to meet with Ortiz and tour a plot of land he hopes will be used for a baseball academy. Ortiz has been spending time with his family since retiring last fall and will in time take on a new role with the team.

“That remains to be defined,’’ said Werner. “I know that David expects to have a role going forward. I think he feels that it’s probably good to have spring training start and not be a presence.

“I would hope at some point he would come here and address the team about leadership. We are talking to him frequently and we expect that he’ll have a role which he will principally define. It will be important.’’

The owners do not expect Ortiz to return as a player.

“He said that he retired,’’ Werner said. “He played last year in quite a bit of pain.’’

Added Henry: “I don’t think [people] know quite how much pain he was in last year. It’s part of life. You move on.’’

Before the players took the field, manager John Farrell and other team officials addressed them as a group. Werner represented ownership.

Werner thanked the players for what was accomplished last season, then used Tom Brady and the Super Bowl champion Patriots as an example of what hard work can produce.

For Farrell, it was a day he always cherishes.

“Today is the first day of the season,’’ he said. “There’s a sense of excitement.

“This day in particular begins that journey that’s going to have some twists and turns along the way. This is a fun day.’’

Peter Abraham can be reached at pabraham@globe.com. Follow him on Twitter @PeteAbe.