Beach Energy has boosted its guidance for full-year production and shaved capital spending plans as it put the final seal on its $1.585 billion acquisition of Origin Energy's conventional oil and gas arm.

Output for 2017-18 is now expected to be between 25.5 million and 27.6 million barrels of oil equivalent, an upgrade of about 2 per cent from the earlier pro forma estimate that took into account the takeover of Lattice Energy.