Abstract:

The international community encourages fully use of natural gas, which is used to replace coal and "makes good inadequate oil with gas". It is expected that by the year of 2020, natural gas production will be increased from 25% to 40% in present energy structure in the whole world. And its rapid and stable development period could last for 40~50 years and it will be one of the most important energy sources in the preliminary period of time in the 21st century. At present, 40%~50% of natural gas resources are accumulated in scattered and remote medium and small-scale natural gas fields in the world. Since these gas fields are usually located in remote and frontier areas, transporting the natural gas, light hydrocarbons and CO2 resources of these areas by pipeline is not reasonable in regard to economy, technology and HSE.

In this paper, appropriate technical measures for separation, treatment, storage, transportion and utilization of natural gases are proposed aimed respectively at medium and small quantity of gas resources. The recovered natural gas and CO2 can be reinjected into oil wells in order to improve oil recovery efficiency. In addition, CO2 can be utilized to treat wastewater containing of CaCl[2] to reduce environmental pollution. Some wastewater can be utilized to produce gas hydrate in order to store and transport gas resources.

In summary, flexible measures are needed in gas separation, treatment, storage, transportation and utilization on the basis of gas quantity, which will provide resources guarantee for fully utilizing available resources and obtaining maximum benefits.

Introduction

Entering the 21st century the situation of the international energy resource is becoming rigorous than ever before and the price of the crude oil is still in a higher position. Since the international community encourages fully use of the natural gas, which is used to replace coal and makes good inadequate oil with gas. It is expected that by the year of 2020, the natural gas production will occupy 40% in the energy structure of the world, playing a leading role. And its rapid and stable development period could last for 50 years and it will be the No.1 clean energy resource. At the same time, the natural gas is one of the most important energy resources in present petrochemical industry.

Much natural gas resources are accumulated in the world, especially the natural gas resources in remote and scattered medium and small-scale natural gas fields or oilfields and it is hard to be used since it is far away from consumer market and not worth transporting by pipeline beause of low production. At present, 40%~50% of natural gas resources are accumulated in about 66% of medium and small natural gas fields in the whole world and the production in these remote and scattered gasfields is low with less than 1×10[4]m[3]/d per well in general. Thus, these resource gases have not been fully developed and utilized because of gas quantity is small. How to effectively develop and utilize these natural gases distributed in the remote and scattered medium and small gas fields is a urgent problem to be solved in the world. To adopt the economic and reasonable measures in development, process and utilization of natural gases has an important significance in effectively utilizing the existing natural gas resources, decreasing cost, prospecting environment, creating a harmonious community and a green environment.

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