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Objective During the transportation of natural gas, in order to meet the downstream pressure conditions, it is necessary to further regulate the pressure. If this part of pressure can be effectively recycled, it is of great significance to improve economic benefits and reduce environmental pollution. Methods Based on the differential pressure power generation project of PetroChina Southwest Oil & Gasfield Company, this paper introduced the process flow of differential pressure power generation of the imported branch in detail, and optimized the equipment selection on this basis. Through data comparison, the performance change of the differential pressure power generation system is analyzed. Results The main influencing parameters are determined to be the inlet temperature of the product gas, the pressure ratio between the inlet and outlet, and the internal loss of the turbine expander. By adding a preheater to appropriately increase the inlet temperature of the product gas, increase the pressure ratio between the inlet and outlet, and replace key components in a timely manner, the power generation efficiency can be effectively improved. Conclusions This research not only provides direction for optimizing the performance of natural gas pressure differential power generation and selecting key equipment, but also provides a theoretical and practical basis for subsequent research while pioneering a new field of differential pressure power generation in the natural gas purification industry. [ABSTRACT FROM AUTHOR]

Objective In the gathering and transportation of natural gas mines with high hydrogen sulfide content, in order to effectively reduce the corrosion hazard of hydrogen sulfide to the system, dehydration is often used to control the water dew point. Methods Based on the research of dehydration technology of high sulfur natural gas at home and abroad, triethylene glycol solvent absorption method was selected as the dehydration treatment process of high sulfur natural gas in Shunbei No. 2 area. Considering the characteristics of high sulfur natural gas in Shunbei No. 2 area, the traditional triethylene glycol dehydration process was optimized and improved locally, and the separation process before the raw gas inlet adsorption tower and the flash-vapor recovery process were added at the same time. Based on the influence of the pre-heating location, regeneration purity and hydrogen sulfide, the paper adopted a two-stage low-liquid/high-liquid heat exchange pre-heating process and LNG gasification gas extraction process to form a dehydration process which is suitable for high-sulfur natural gas in Shunbei No. 2 area. Results After transformation, the dehydration process realized zero discharge of sulfur-containing tail gas from dehydration system by pressurized recovery, and the combination of efficient desulfurization and purification of triethylene glycol (TEG) realized by LNG gasification and gas stripping, the problem of corrosion and maintenance of regeneration device in acid environment was solved. Conclusions This dehydration process effectively promoted the realization of the overall development plan of Shunbei No. 2 area, and formed a high-pressure gathering and transportation dehydration process suitable for natural gas with high hydrogen sulfide content in Shunbei No. 2 area, which provides technical support for the further development of Shunbei natural gas blocks. [ABSTRACT FROM AUTHOR]

Copyright of Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong is the property of PetroChina Southwest Oil & Gas Field Company and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problem that gas hydrate is easy to form and block the pipeline equipment in the process of natural gas gathering and transportation, a combined hydrate inhibitor is screened by the experiment in this paper and used in the gas field to verify its safety and validity. The experimental results showed that when the inhibitor concentration was 2.0 wt%, the inhibition time was more than 1400 min. The concentration of suspended solid (SS) of treated gas field water is 4.8 mg/L, oil concentration is 15 mg/L, and pH value is less than 8. Treated water quality meets the SY/T 6596-2016 Requirement of Recommended Practice for Produced-water Reinjection in Gas Field. [ABSTRACT FROM AUTHOR]

At present, natural gas hydrate(NGH) considered to be a potential unconventional gas resource. It is meaningful to study the natural gas hydrate exploitation and various new technologies such as the storage of natural gas in the form of hydrates. This paper summarizes the development status of hydrate technologies all over the world, such as formation process, storage and transportation methods of NGH. Then the compare of natural gas transportation ways between in the form of NGH and LNG (liquefied natural gas) was made. The results indicated that the NGH is one of the high efficient, economical and safe storage and transportation methods. Finally, the utilization of NGH in future is expected. [ABSTRACT FROM AUTHOR]

In the process of gas transportation and desulfurization technology in high sour gas reservoir, the corrosion caused by CO2-H2O, H2S- H2O, CO2 - H2S- H2O and R2NH - H2SCO2 - H2O, etc. can cause enormous losses, therefore, monitoring and safety evaluation for corrosion behavior is essential in sour gas well, which is of great significance for safety optimize the natural gas production. In this paper, based on investigation and study of corrosion and monitoring situation n high sour gas well, arranging of corrosion monitoring points, choices corrosion monitoring methods, division of corrosion loop and establishment of corrosion database and reliability evaluation etc. were introduced, corrosion monitoring technology or Longgang sour gas field was taken as an example. [ABSTRACT FROM AUTHOR]

Purified Gas Transmission Station is one of he two main natural gas sources for Central Asia pipeline. It is an automatic station which has the advantages of both pressure boosting for long distance pipeline and trade meter. 3 x 109 m³ of natural gas are processed every year. This paper mainly analyzes control system of the compressor, station control system, ESD system, third -- party control packages, on -- site measurement and control instruments and equipment, etc. Existing problems of the automatic system have been found, some solutions and suggestions have been proposed for the production. [ABSTRACT FROM AUTHOR]

The formation of natural gas hydrate may block the transportation tube or the wellbore during the oil and gas production, transportation or drilling operation. It is necessary to take the salts and alcohol mixing systems into account if we calculate the forming conditions of the natural gas hydrate. In this paper, considering the interaction of ions and solvents, the water activity is calculated with extensional UNIQUAC model, and the forming conditions of gas hydrate in rich water are predicted by Van der Waals--Plat-eeuw model. The calculated results are in good agreement with the experimental data, so it can offer reference for inhibition of gas hydrate in -- situ. [ABSTRACT FROM AUTHOR]

The multi--stage flash and micro--positive pressure fractionation technology is applied in Yaha condensate gas field to stabilize the condensate oil. At the same time, air--cooler is used to control the temperature of the condensate oil before transporting. The salt deposition appears in the reboiler of condensate stabilizer, and the frozen block appears in the coil of air--cooler frequently, which reduces the yield and quality of condensate oil seriously. This paper analyses the reasons of the above problems, and puts forward the relevant measures to ensure the equipment running safely and smoothly. [ABSTRACT FROM AUTHOR]