As of March 2021, no longer restricted. Previously, foreign investment in O&G onshore drilling and other services was prohibited.
"APPENDIX III - REGULATION OF THE PRESIDENT OF THE REPUBLIC OF INDONESIA NUMBER 49 OF 2021 CONCERNING AMENDMENT TO PRESIDENTIAL REGULATION NUMBER 10 OF 2021 CONCERNING THE INVESTMENT BUSINESS SECTOR
LIST OF BUSINESS FIELDS WITH CERTAIN REQUIREMENTS
- Oil and gas construction services (Onshore oil and gas upstream production installation,  onshore pipeline installation, Horizontal/vertical tank, onshore oil and gas storage and marketing installation), Onshore oil and gas drilling services, Oil and gas supporting services (well operation and maintenance service, oil and gas design and engineering service,  technical inspection service) [see 2019 restrictions below]: Open (without condition) [no longer listed][...]"(Presidential Regulation (PERPRES) No. 49 of 2021 Concerning Amendments to Presidential Regulation Number 10 of 2021 concerning Investment Business Fields [google translation])
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Previously: up to 2020
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"APPENDIX III - REGULATION OF THE PRESIDENT OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITION TO INVESTMENT - 
LIST OF BUSINESS FIELDS THAT ARE OPEN UNDER SPECIFIC CONDITIONS [...]
D. Energy and Mineral Resources Sector
- Oil and gas construction services (Onshore oil and gas upstream production installation,  onshore pipeline installation, Horizontal/vertical tank, onshore oil and gas storage and marketing installation), Onshore oil and gas drilling services, Oil and gas supporting services (well operation and maintenance service, oil and gas design and engineering service,  technical inspection service): Domestic capital: 100% [...]"(PRESIDENTIAL REGULATION OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITIONS TO INVESTMENT)
Presidential Regulation (PERPRES) No. 49 of 2021 Concerning Amendments to Presidential Regulation Number 10 of 2021 concerning Investment Business Fields [google translation]
PRESIDENTIAL REGULATION OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITIONS TO INVESTMENT
[<a href="https://peraturan.bpk.go.id/Home/Details/168534/perpres-no-49-tahun-2021">PR49</a>],[<a href="https://peraturan.bpk.go.id/Home/Details/161806/perpres-no-10-tahun-2021">PR10</a>],[<a href="https://peraturan.bpk.go.id/Home/Details/40374/perpres-no-44-tahun-2016">PR44</a>]