Diagnostic Method and Adaptability Analysis of Multiple Water Breakthroughs in Horizontal Well in Combined Well Pattern

The combined well pattern has been widely used in reservoir development, with a common being horizontal the center for oil production and multiple vertical wells around water injection. For this type of pattern, determining is affected by which injection wells, especially when injecting breaks through, accurately direction inflow will provide an important basis targeted measures. Based on performance data semi logarithmic relationship curves water-oil ratio, derivative cumulative were first time to determine breakthrough problem surrounding based their response characteristics. adaptability method under different influencing factors was analyzed. Introducing parameter not only preserves variation trend ratio time, but also facilitates processing actual data.