HOUSTON, May 3 (Reuters) - Exxon Mobil ( XOM ) will take

18 to 24 months to achieve its full production synergies from

its $60 billion purchase of U.S. shale oil producer Pioneer

Natural Resources ( PXD ), the company's top shale executive said on

Friday.

Exxon this week closed all-stock acquisition after agreeing

to an antitrust consent order that barred the former Pioneer CEO

from joining its board and is moving in coming weeks to combine

operations that will form the largest oil producer in the

Permian basin.

"You will see (oil production) grow pretty rapidly, year

over year," said Bart Cahir, Exxon's senior vice president of

shale, as Exxon applies its current growth strategy to the

resources incorporated from Pioneer.

The purchase more than doubles Exxon's output in the

Permian, the top U.S. shale field, to about 1.3 million barrels

per day of oil and gas.

An additional 700,000 barrels per day is predicted by

2027 as Exxon combines its proprietary technologies to Pioneer's

inventory - a merge that Exxon's CEO Darren Woods previously

said would "create magic."

Those new wells should come on stream in 12-18 months,

with typically another six months to develop production, he

said.

"The development time horizon when you are developing at

scale is around 18 to 24 months," Cahir said. "We're going to

take a best-of-both approach to putting the organization

together."

Asked about plans to add fracking crews in the Permian

this year, Cahir said he would "not going to go into the

specifics..

With Pioneer's acreage, Exxon controls 1.4 million acres

(566,560 hectares) of prime areas that will allow it to drill

longer and more closely-spaced wells in cube format, he said.

Exxon has proprietary technologies that allow it to be

"very, very prescriptive and targeted in our designs. That's

something that enables us to do more with less," he said.

The company expects to offer positions to the "overwhelming

majority" of Pioneer employees in the next two months, he said,

declining to specify any cuts to Pioneer's roughly 2,200

workers.

Integration teams from both companies have been working for

six months to smooth the transition process. They "have really

clicked well. We're a lot more similar than we are different,"

Cahir said.

Cahir said Pioneer's crude oil trading team fits well into

Exxon's global trading organization, created more than a year

ago.

Exxon also will move Pioneer's oil into Exxon's pipeline and

logistics, connecting the volumes to U.S. Gulf Coast plants that

produce fuels and plastics, he said.