Control of high resolution sequence stratigraphy on microfacies and reservoirs:A case from the upper Ma 5 member in Tong 5 wellblock,Jingbian Gas Field;

Factors influencing natural gas enrichment in Jingbian gas field,Ordos basin;

Recognition,distribution and genesis of the water-rich strata in the Jingbian Gas Field;

Research on dominant factors and gas-water distribution modes in relative water rich area in Low Palaeozoic of Jingbian gasfield;

Sedimentary facies and sandbody distribution of the Member 2~3 of Shanxi Formation in Jingbian Gasfield, Ordos Basin;

High-precision integrative recognition technology for flutings in Jingbian Gasfield,Ordos Basin;

Application of Neutron-Density Overlapping to Identify Gas Reservoir in Changqing Gas Field;

Single-point testing" empirical productivity formula and test conditions for gas wells in Lower Paleozoic of Changqing gas field;

Reservoir description of Lower Paleozoic in Changqing gas field during exploitation phase;

All these problems in Changqing Gasfield are caused by the natural .

In addition to a brief introduction on current worldwide applications of downhole choker, the alcohol injection process by high-pressure gas collection in Changqing Gasfield and the serious plugging phenomena in some gas wells and gas collecting pipelines were analyzed in this paper.

To avoid the formation of natural gas hydrate, Changqing Gasfield adopted the solution of methanol injection from the wellhead and central treatment of sewage produced by individual well via methanol recycle facility.