Productivity Testing and Analysis of Low Permeability and Thick Layer of N Gas Field
| Autor: | Zhi-xing Yang, Xian-kang Hu, Quan Hua Huang, Xing Yu Lin, Ke-feng Lu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:GE1-350
Drill stem test 0211 other engineering and technologies Soil science 02 engineering and technology 010501 environmental sciences Open flow 01 natural sciences Exponential function Natural gas field Permeability (earth sciences) Low permeability 021108 energy lcsh:Environmental sciences 0105 earth and related environmental sciences Test data Mathematics Arithmetic mean |
| Zdroj: | E3S Web of Conferences, Vol 213, p 02002 (2020) |
| ISSN: | 2267-1242 |
| DOI: | 10.1051/e3sconf/202021302002 |
| Popis: | For a better guidance of production, a combination of drill stem testing (DST), regional statistical method and pseudo steady-state seepage theory model was used to analyze the productivity of N gas reservoir in light of the complex geological features of the low-permeability thick-layer. Firstly, the DST method was used to test the N gas reservoir. And then the binomial pseudo-pressure method, binomial pressure square method and exponential method were used to interpret the test data of DST of this formation. Finally, the binomial pseudo-pressure interpretation method was used and the results showed that only the productivity of H3b layer was successfully tested of the four. The H3a, H4b and H5a layers are ultra-low pore and permeability gas reservoirs and the productivity of these layers can’t be explained by the available data due to the short testing time and a non-stationary state of testing pressure and quantity, resulting in the failure of the test. The productivity of the main layers were estimated and forecasted by the regional statistical method and the theoretical model of pseudo steady-state seepage, taking the arithmetic average value of the regional statistical method and the theoretical formula as the final value of absolute open flow rates(AOF). The final calculation results are as follows: the AOF of main gas layers H3a, H3b, H4b and H5a in N gas field is 31.30×104m3/d, 388.92×104m3/d, 20.82×104m3/d and 30.80×104m3/d, respectively. This method may sheds light on verifying and calculating the productivity of gas wells and determining the reasonable production allocation of gas wells. |
| Databáze: | OpenAIRE |
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