Geothermalkits & Team Introduction

This release of Geothermalkits version 3.3 software adds"Static Stratigraphic Temperature Prediction."Module.New module developed by Xiaoming Tian and Changwei Liu. Due to the influence of drilling fluid, mud and other disturbances, the process of obtaining the true formation temperature through the bottomhole temperature requires several well shutdowns and measurements to ensure its accuracy, however, due to the large downhole disturbances, the shutdowns can take several days, or even months to stabilize, and the cost of time, personnel, and equipment is high, this module can realize the true prediction of low-cost and fast formation temperatures.

(1) Double click the "Geothermalkits" icon to start the software, as shown in the figure:

(2) Click on "Calculation module" - "Static formation temperature prediction".

(3) Parameter input

Temperature data can be entered by entering the shut-in time (in hours) and the well temperature (in degrees Celsius) into the form. During the process of entering parameters, you can add or delete entire rows of data by "adding rows" and "deleting rows" for the selected rows. You can also import time and temperature data from a file similar to the following data format by clicking the "Import File" button:

Click on "Calculate and Plot" to get the static stratigraphic temperature prediction data, as shown below:

The asymptote in the above figure (red dotted line) represents the bottomhole temperature as the shut-in time approaches infinity, i.e., close to the true static bottomhole temperature

(4) Introduction to Principles:

The calculations in the module "Static Formation Temperature Prediction" are mainly based on the static formation temperature prediction formulas established in the article Static Formation Temperature Prediction Based on Bottom Hole Temperature:

where t is time, BHT is Bottom Hole Temperature (BHT), and a, b, and c are the relevant control variable coefficients.

By solving the coefficients a, b, and c using the particle swarm algorithm the difference between the results calculated by the model and the input observations becomes smaller and smaller, and finally less than the limit of the error value the calculation is finished. After obtaining the optimized a, b, c, the static formation temperature can be predicted by extending the time t to infinity.

GB/T 11615 algorithm for calculating carbon dioxide emission reductions

The "U-well heat transfer" module of the Geothermalkits realizes the dynamic long-term simulation of the heat transfer process of the mid-depth U-tube heat exchanger without water extraction. The module adopts OGS-6 numerical algorithm (finite element method with bicontinuous medium) as the calculation kernel, which can realize the dynamic heat transfer calculation for the buried pipe and its surrounding three-dimensional coupled geotechnical soil. At the same time, automatic mesh splitting is realized with the help of GMSH software method, which greatly reduces the number of meshes required for the model without affecting the calculation accuracy.The model run time is now reduced to about 20 minutes/heat extraction run year, with a tens of times higher run efficiency compared to traditional 3D numerical simulationThis maximizes computational efficiency and reduces user difficulty.

Deep U-tube inlet and outlet temperatures versus time graphs

Temperature distribution of in-tube circulation in month 3

Temperature distribution of in-tube circulation in month 16

Dynamic plot of profile temperature distribution

Geothermalkits'sThe "Deep Well Heat Transfer" module is mainly used to simulate the coaxial tube deep heat but not water model, which couples the dual-continuum medium method (i.e., the heat transfer well and the surrounding rock mass) and automates the mesh dissections, which greatly reduces the number of meshes in the model, and reduces the completion time of the previous model runs from several days to a few hours, and the "Deep Well Heat Transfer" module is mainly used to simulate the coaxial tube deep heat but not water model.Nearly ten times more efficient operationThe system is designed to maximize computation speed and minimize the difficulty of operation for the user.

Deep well heat transfer simulation at the touch of a button

Temperature versus depth graph

Temperature at the exit of the extraction well as a function of time.

The "Well Spacing Optimization" module is mainly based on the geothermal well pair (Doublet) as a model for the simulation of well spacing optimization, well spacing optimization module can assist the decision makers of geothermal resource development for the management of thermal field production.

The "Resource Evaluation" module focuses on simple geological modeling of geothermal reservoirs and calculation of geothermal resources.

The "Shallow Geothermal" module mainly simulates shallow buried pipe well discharge heat exchange models.

Shallow geothermal simulation at the touch of a button

Temperature field distribution over time