PetroChina Huabei Oilfield Limited, or PetroChina, which is a subsidiary of CNPC, has awarded Greka the work for its ANZE block.
Each of the new contracts is for 18 months, with a scope of 10 directional wells, to be drilled on multi-well pads, the firm said.
The contract for PetroChina's ANZE block, which was announced in August 2017, has been completed with 10 wells being sunk, Greka added.
Meanwhile, in India, Greka says it is in discussions with Oil and Natural Gas Corporation Ltd which may lead to changes or indeed the termination of the Bokaro drilling contract, announced last month.
"The awarding of these new contracts by PetroChina has been the result of a strong drilling performance by the Company's advanced rigs and experienced crews," said Randeep S. Grewal, chairman at Greka.
"We expect more contracts to be awarded in the near future as China operators continue to ramp up their drilling programs to meet the country's increasing demand for clean energy through CBM gas.
"We are seeking to clarify the situation in relation to the ONGC contract and will provide an update when appropriate."
Greka shares were down around 22% to 1.90p in early deals.