Abstract
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%.
Highlights
The imbalance between natural gas production and its demand causes Indonesia to become a natural gas net importer country by 2025 [1]
In natural gas production from well that consists of high water content gas or gas reservoir with water drive mechanism, water is routinely produced with natural gas
With reservoir decline due to natural gas production, water is accumulated in the bottom of well and causes liquid loading
Summary
The imbalance between natural gas production and its demand causes Indonesia to become a natural gas net importer country by 2025 [1]. Many factors cause low natural gas supply, including operational problem in gas well that decreases gas production. There are four main operational problems in natural gas production : low productivity, excessive water production, sand production from sandstone reservoir, and liquid loading [2]. With reservoir decline due to natural gas production, water is accumulated in the bottom of well and causes liquid loading. Capillary string that has smaller inner diameter than production tubing diameter is installed to flow chemical mixture to well bottom. With appropriate composistion of injected chemical, liquid loading can be overcome and gas production rate increases
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