In view of the characteristics of dense reservoir, such as low porosity, low permeability, thick reservoir, complex lithology and strong heterogeneity, horizontal well completion and multi-stage graded volume fracturing technology is one of the important methods to improve the productivity of single well. In order to accurately evaluate the characteristics of dense reservoir and fracturing effect, it is necessary to obtain the data of segmented oil and water production, formation pressure, temperature and so on. In the aspect of testing instruments, the multi-stage oil test technology of continuous oil tubing horizontal well is developed to solve the problem of horizontal well data acquisition. The analysis of the oil test data also needs the corresponding methods and means. There are many problems in the production of low permeability and ultralow permeability reservoirs, such as pressure, production decline fast, unstable production and so on, especially with the development of reservoir reconstruction technology (straight well stratification, horizontal well classification), it is also necessary to further study the decline regularity of production and pressure declination, and the productivity will be evaluated. In this project, perfects interpretation method of horizontal well testing data is required, and the medium-long term productivity prediction method is studied by using the test data.

This project needs to complete: The mathematical models of "Horizontal Well Testing Data Interpretation and Analysis Software" and "Medium-long Term Productivity Prediction Method by Using Well Testing Method", the dimensionless of equation and its solution, the well testing analysis method under horizontal well and its multi-stage fracturing, the wellhead pressure to bottom hole pressure conversion method, and the medium-long term productivity prediction method for oil test. The software includes overall design, programming, integration and testing, related technical report writing and so on. The main technical contents are as follows:

Software for interpretation and analysis of horizontal well testing data.

Medium-long term productivity prediction software for oil test.

Interpretation method of horizontal well testing data: Interpretation and analysis of single section test data of horizontal well (single stage pressure, flow test), multi-stage flow test, horizontal well testing data interpretation, data interpretation of multi-stage combined overall pressure test.

The coded horizontal well interpretation analysis software is applied in Daqing, Xinjiang, Changqing and so on oil fields, and it also applied in Sichuan shale gas horizontal well.

The medium-long term productivity prediction of oil test is carried out by using well testing method:

Using the oil test data, the productivity prediction method of fracturing horizontal well is established under the condition that the production and pressure are decreasing.

In this project, perfects interpretation method of horizontal well testing data is required, corresponding software is formed and the medium-long term productivity prediction method is studied by using the test data.