Indonesia, whose 453 TCF potential coal bed methane (CBM) reserves, rank the 6th largest CBM reserves around the world. However, the technical limitation is amongst the major issues slowing down the exploitation progress of the resources which current national CBM production only reach up to 1 MMSCFD. This paper provides a newly enhanced coal bed methane (ECBM) recovery method to improve the methane production. Scenarios of nitrogen (N2) and carbon dioxide (CO2) injection were used in this study to perform 25 years production simulation and compared with CBM primary production. Created hypothetical model based on the characteristic of coal seams CBM field in South Sumatra, Indonesia, was used to analyze the increasing methane production by using N2 and CO2 injection with different compositions and rates. The result observed about 3,52% incremental methane production by injecting N2 into CBM reservoir. In other words, this new method has an impact on enhancing the CBM national production, particularly South Sumatra CBM field, which could be useful for further CBM development in Indonesia. Mixture injection seemed to be unfavorable for the field due to the difference of gas mechanism. Thus

This study to determine the efficiency of next-G geese foot turbine, the Angled Water mill is utilized in rural or remote areas, with potential rivers and local people to easily adopt the material. It is necessary to design a new turbine that can able to extract energy from free fluid flow or zero head water power resources. The design and material of the design was done using Computational Fluid Dynamics (CFD) software. The method is to know the most optimal modification of goat water turbine design from the variation in width and number of feet of Next-G geese foot mill legs as follows: (1) 600; (2) 700 mm; (3) 750 mm, for the number of legs used 4 pieces, 6 pieces, 8 legs.The results of development the Next-G goose footwheel mill blade is the moments pressure value increased for the width of the water wheel blade 750 mm, and the moments pressure decreases to 600 mm. The number of feet 4 blade the pressure moment is increased and decreasing for the number of feet of 8 blade. The optimum moments pressure is applied to the width 750 mm waterwheel blade, and the number of 4 impeller feet.

Many problems often occur in producing natural gas from well. Due to the existence of water content in natural gas or water drive mechanism, liquid (especially water) is also produced from gas well, following natural gas production. When gas critical rate is higher than gas production rate due to reservoir pressure decline, it will cause liquid accumulation in the bottom of well, avoiding natural gas to be well lifted from well bottom to surface. It is liquid loading. Chemical injection of 0.4 liquid that consists of ethoxy sulphate, alkane sulphonate, and petroleum sulphonate is effective to overcome liquid loading in natural gas well thus causing an increase in natural gas production by 57%.

No abstract