Oil and gas service company PT Elnusa Tbk (ELSA) worked on the exploration of oil and gas with total value of over Rp1 trillion in the first half (H1) this year. The oil and has industry has not recovered yet, then ELSA’s exploration turned lower. ELSA said mostly its exploration projects are worked together with state oil and gas firm Pertamina. ELSA’s projects include 3D-seismic survey in West Papua, 3D-seismic survey in Aceh, and inland well drilling in East Kalimantan.