Chengong production data analysis software V3.0 is an important tool to obtain oil and gas
reservoir or oil and gas well parameters through oil and gas well production dynamic
analysis, processing and interpretation of oil and gas well daily dynamic data response. The
specific analysis process is to measure wellhead pressure (or bottom hole pressure) and
surface production data. By analyzing the changing trend of pressure and production data,
the purpose of inversion of underground parameters, prediction of future production capacity
and understanding of formation dynamics is achieved, which provides scientific guarantee for
the scientific formulation of oil and gas development system.
The software is easy to operate and provides more than 90,000 kinds of oil and gas well
analysis models, which is suitable for the development of conventional oil and gas, dense
oil and gas, shale gas, coal bed methane and geothermal resources, and meets the
interpretation needs of exploration and development of various oil and gas reservoirs
domestic and abroad.
The software has been upgraded and optimized on the basis of Chen Gong production data
software V1.0, using new Ribbon interface design, has friendly interface and easy to
operate.
Data processing: including fluid type selection, basic parameter
input, pressure and flow data input over time, data processing and model diagnosis and other
functions.
Traditional simulation: provides traditional
Arps、Fetkovich、Blasingame、A-G、NPI and Transmit analysis methods for vertical oil-gas wells
where flow has reached the boundary.
Combination simulation: provides the material equilibrium time
method and the coordinate combination method based on the accumulation time, including the
double logarithmic curve plate simulation method and the Blasingame curve plate simulation
method, basically covers the production model which already has the analytical solution,
applies to all oil and gas wells example.
Capacity prediction: according to the formation parameters
obtained from the simulation analysis, the following production conditions (such as constant
pressure production) are set, and the trends of future pressure and capacity are predicted,
while the auxiliary functions such as transient capacity, capacity evaluation and pressure
design are provided.
Visual display: Based on the parameters of production data
analysis or well test analysis, the formation pressure distribution at different times under
variable production capacity can be calculated and animated with two-dimensional or
three-dimensional graphics, which can more intuitively describe the formation flow.
According to the special properties of unconventional oil and gas reservoirs such as shale
gas and the development characteristics of deep resources in China, the software puts
forward a new method of production data analysis, and gives a method of plate simulation
based on accumulated production, which can realize the production data analysis under the
condition of variable flow and pressure of oil and gas wells; for the case of frequent
shut-in and open wells, it provides the function of selecting shut-in point, which greatly
improves the interpretation accuracy; for the case of data analysis during the fracturing
liquid flowback drainage process, a shale gas and water two-phase flow model is proposed. In
the future production and pressure prediction function, various of variable system
prediction methods suitable for shale gas production are provided.
Abundant simulation methods: initiating mouse drag simulation and
the automatic simulation method based on big data, simple to operate, fast and accurate,
meanwhile also provides a common manual simulation and nonlinear regression simulation
method.
First time proposed the simulation method which the transverse
coordinate is the cumulative time, which solves the problem that the transverse coordinate
of the material equilibrium time is not monotonous, and effectively improves the simulation
quality of the plate when the measured data is too chaotic.
Data mutation point function: in view of the drastic data
fluctuation caused by frequent shut-in and open wells and changing working system, the
virtual equivalent time correction theory is first time created, and the function of
selecting mutation points is provided, which greatly improves the quality of curve and
historical simulation, and gives more realistic production capacity prediction results.
Calculation of the proportion of adsorbed gas: real-time
calculation function of the proportion of adsorbed gas in shale gas production is first time
created, to assist in judging the production stage of shale gas well, and to help the
rational planning of subsequent production.
Shale gas and water two-phase flow model: in view of the shale
gas flowback drainage stage and the large amount of liquid production in the early stage of
production, the first two-phase flow analysis model of shale gas and water can be put
forward to calculate the change of water saturation near the wellbore and scientifically
plan the shale gas flowback drainage and production system.
Various production capacity forecasting methods: including
constant pressure forecasting, constant flow forecasting, constant production first then
constant pressure forecasting, constant pressure first then constant production forecasting,
pressure trend line forecasting methods, etc., which are more close to the field production
practice, the prediction results are more accurate, and provide theoretical basis for
subsequent production.
图1 Blasingame拟合图
图2 双对数曲线拟合图
