Any economic activity carried out by an organization, can generate a wide range of environmental implications. Particularly important, must be considered the activities that have a significant negative effect on the environment, meaning those which pollute. Being known the harmful effects of pollution on the human health, the paper presents two models of utmost importance, one of the material environment-economy interactions balance and the other of the material flows between environmental factors and socio-economic activities. The study of these models enable specific conditions that must be satisfied for the economic processes friendly coexist to the environment for long term, meaning to have a minimal impact in that the residues resulting from the economic activity of the organization to be as less harmful to the environment.

In order to be transported and used under secure conditions, the natural gas must meet a set of quality requirements that also include a maximum value of the dew point for water from the commercial delivery/ pickup point. This assumes the treatment of natural gas in order to reduce the water vapour content, using dedicated equipment, named gas drying or dehydration stations. The materials or substances used for gas dehydration, on an industrial scale and for many years, in the natural gas production areas, are part both of the adsorbent substances category as well as of the absorbent substances category. The paper presents the theoretical and practical aspects regarding the determination of gas humidity and a synthesis of the real casuistry related to exploration of gas dehydration stations by underlining the problems concerning the proper performance of these stations.

The work completed was a comprehensive look into a mature gas field's intervention and production history to identify underachievement, redevelop the field management plan and implement successful remediation operations. The identification and characterization of skin was initially completed with physical inspection and slickline techniques. The decline curve analysis applied adapts to erratic declines from changing wellbore conditions, unreliable, or incomplete histories and provided accurate production forecasts. Pumping and coiled tubing techniques were used in the remediation work. In 2003 an Association was formed to manage a mature Romanian gas field producing since 1970. Production skin was evident and in 2010 the first well failed due to halite formation; consequently, liquid and solid sampling tools were deployed within suspect wellbores. The damage was characterized (halite, calcite and water blockage), novel decline curve analyses detected underperformance by integrating cumulative production histories. Twenty-two wells from one zone were initially assessed. All were damaged with some showing physical evidence of scale or salt, and a seven well pilot intervention campaign resulted in 38% peak incremental production. The outstanding results matched decline curve expectations and led to a full-field study, a campaign to intervene over half of the field based on that study, and possible expansion to all remaining wells in subsequent years. Technically, the innovative decline curve analysis proved crucial to discovering opportunities. Operationally, the optimized intervention procedures introduced were new to the basin and have been adopted by the Association partners in other assets. A major limit on ultimate recovery from depleted hydrocarbon reservoirs is declining well productivity. Salt formation, scale deposition, and water loading restrict flow: reducing production rates and increasing operating costs due to remedial interventions. Therefore, economical skin management is an essential tool for extending field life, increasing profitability, and improving recovery factors from aging assets. Impressive results led to a strategic shift in local field production management and the techniques are useful worldwide in similar fields.

The work completed was a comprehensive approach of understanding and treating formation damage to further redevelop a mature asset through successful remediation operations. The identification of skin was completed with slickline techniques and reservoir and production flow profile monitoring. Primary formation damage mechanisms were naturally occurring scales in the near wellbore, damage caused by water blockages and workover fluids. Redesigned completion fluids, acid pumping and innovative coiled tubing tools were used in the remediation works which were all firsts in the basin. A modified decline curve analysis technique was used to economically justify treatment of nearly all wells in the field and led to substantial production increases.In 2003, an Association was formed to manage a mature Romanian gas field producing since 1970. Production skin was evident and in 2010 a well failed due to halite formation. Consequently, liquid and solid sampling tools were deployed within suspect wellbores. In 2010, a new workover fluid formulation was introduced but despite improvements formation damage was still induced. From 2010 to 2013, there had been an increased focus on understanding and treating calcite, halite and water block damages to boost field-wide productivity.Formation damage was observed as being both naturally occurring and induced in the field. An initial assessment and pilot treatment of 10% of the wells led to a near 40% incremental gain in those wells. After which, the campaigns were further expanded to over 75% of the field. Technically, the investigation into formation damage changed the development plan for the field going forward. Operationally, the intervention procedures introduced were new to the basin and have been adopted by the Association's partners in other assets.A major limit on ultimate recovery from depleted hydrocarbon reservoirs is declining well productivity. Salt formation, scale deposition, and water blockage restricts flow, reducing production rates and ultimate recovery of reserves. Therefore, economic formation damage management is an essential tool for extending field life, increasing profitability, and improving recovery of aging assets. Impressive results led to a strategic shift in local field production management and the techniques are useful worldwide in similar fields.

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