Xian Changqing Scientific and Technological Engineering Co.

Fengcheng, China

Xian Changqing Scientific and Technological Engineering Co.

Fengcheng, China

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Wang D.,Xian Changqing Scientific and Technological Engineering Co. | Yang J.,Xian Changqing Scientific and Technological Engineering Co. | Shi W.,Petrochina | Zheng X.,Xian Changqing Scientific and Technological Engineering Co. | Zhao Y.,Xian Changqing Scientific and Technological Engineering Co.
Natural Gas Industry | Year: 2014

The Sulige Gas Field in the Ordos Basin operated by the PetroChina Changqing Oilfield Company is one of the typical tight sand gas fields with low single-well productivity, difficult-to-control surface engineering investment, high pressure drop rate of a single well, unsteady deliverability, etc. In order to further cut down the development cost and meet all the requirements of low-cost and commercial gas production in such a field, it is necessary to optimize and simplify the ground gathering and transportation process through the research and development of new equipments, new technologies, and new materials. In this case, we introduced how such a great success was made in the Sulige Gas Field. First, all the gathering facilities were all set in an integrated skid, thus an integrated device with valve groups was developed to optimize the concatenation process; the previous well-to-well connection was turned into the link between valve groups; in this way, wellhead gas flew through lines to valve groups, then to trunk lines and then to pressure boosting stations; from there the gas was pumped to branch lines and was all gathered in a natural gas processing plant at last. Second, a well group boosting pressure integrated device was developed to decrease the abandoned wellhead pressure around the wellhead and increase the accumulated gas production of a single well. Third, the gas-liquid separation technology was applied to achieve the 24-hour continuous and stable transportation with freezing proof measures adopted. Finally, non-metallic pipes were mostly employed to significantly cut down the operation cost. This successful experience also provides reference and technical support for the development of other similar gas fields in China.


Zhou Y.,Petrochina | Zhang G.,Petrochina | Wang D.,Xian Changqing Scientific and Technological Engineering Co. | Chi Q.,Xian Changqing Scientific and Technological Engineering Co. | And 2 more authors.
Natural Gas Industry | Year: 2014

For achieving the goal of "centralized and grouped" deployment and "factory-like" production of horizontal well development in the Sulige Gas Field, the ground engineering construction project was optimized based on the existing downhole throttling technology. First, the radius of gas collecting was increased from the regular 6 to 7 km in a gas gathering station. Second, standardized gas gathering stations were designed with the respective capacity of 1000, 1500, and 2000 thousand m3/d. Third, a large-capacity compressor with a 957 kW power was optimally selected. Fourth, the cascading mode of gas gathering lines was changed in this way: the wellhead gas flowed through gathering lines to trunk lines, then was collected by header pipes, and finally went to a gas gathering station. Fifth, data transfer radio was turned into optic fiber transmission to achieve a better wellsite communication with high data security and steady system performance. Meanwhile, an integrated gas gathering unit was developed with the capacity of 1000 thousand m3/d equipped with many functions such as station-entrance emergency shutdown, remote venting in trunk lines, gas-liquid separation, handover flow, transmission measurement, pigging, self-use gas supply, flashing, automatic liquid discharging, etc. Also, an electronic integration device was developed to form standards and series for design technologies of cluster well groups, thus providing technical support for programming and efficient development of a gas field.

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