Research Article
Production Data Analysis and Practical Applications in the Sulige Tight Gas Reservoir, Ordos Basin, China
Table 1
Common problems in the production data diagnosis of the tight sandstone gas reservoir.
| | Problem | Cause |
| I Unsteady state | ① Flat early data | Contaminated well | ② High early data | Initial reservoir pressure is low | ③ Normalized rate increases with time | Well washing | ④ Step-shaped early data | Initial reservoir pressure is high? Large tubing size |
| II Transitional stage | ⑤ Early arrival of boundary flow | Bottom hole overstock liquid |
| III Pseudo-steady state | ⑥ Data below the 45-degree slope line | Bottom hole overstock liquid | Pressure loss caused by wellbore instability | Multiwell interference (Energy leakage) | ⑦ Not unified | Unstable production (Workover, etc.) |
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