geodrillcalc 0.4.1a0

Geothermal Wellbore Parameter and Cost Calculation Tool for SGIL Project

GeoDrillCalc - Geothermal Wellbore Parameter and Cost Calculation Tool for SGIL Project

GeoDrillCalc is a Python package for calculating wellbore parameters and estimating costs associated with drilling operations. The package uses input data about aquifer layers and initial parameters to output wellbore specifications and cost estimates. It's designed for use in various applications, including web applications and other software tools.

Features

• Aquifer Layer Analysis: Determines the necessary wellbore specifications based on aquifer layers and depths.
• Wellbore Specifications: Calculates screen length, screen diameter, open hole diameter, and pump parameters.
• Cost Estimation: Provides detailed cost breakdowns including drilling rates, material costs, time rates, and other costs.
• Output Format: Results are provided as dictionaries, which can be easily converted to JSON or used directly in other applications.

Installation

tbd

Example Usage

A basic example of how to use GeoDrillCalc to calculate wellbore parameters and costs:

import geodrillcalc.geodrillcalc_interface as gdc

# Define aquifer layer data (usually queried from a database)
aquifer_layer_table = {
    "aquifer_layer": [
        '100qa', '103utqd', '105utaf', '106utd', '107umta', 
        '108umtd', '109lmta', '111lta', '114bse'
    ],
    "is_aquifer": [True, False, True, False, True, False, True, True, False],
    "depth_to_base": [3, 53, 112, 150, 150, 1000, 1000, 1221, 1421]  # in metres
}

# Define initial values
initial_values = {
    "required_flow_rate": 4320,  # in litres per minute (L/min)
    "hydraulic_conductivity": 5,  # in metres per day (m/d)
    "average_porosity": 0.25,     # unitless (fractional)
    "bore_lifetime_year": 30,     # in years
    "groundwater_depth": 25,      # in metres
    "long_term_decline_rate": 1,  # in percentage per year (%/year)
    "allowable_drawdown": 25,     # in metres
    "safety_margin": 25,          # in percentage (%)
    "target_aquifer_layer": "109lmta", #the aquifer layer where the wellbore screen is installed. It’s the layer that you are primarily interested in extracting groundwater from or monitoring.
    "top_aquifer_layer": "100qa" #the uppermost aquifer layer
}

# Initialise GeoDrillCalcInterface instance
gci = gdc.GeoDrillCalcInterface()

# Calculate wellbore parameters and costs
wbd = gci.calculate_and_return_wellbore_parameters(
    is_production_well=False,  # pass True for production wells, False for injection wells
    aquifer_layer_table=aquifer_layer_table,
    initial_input_params=initial_values,
    cost_rates=None,  # Optional: Dictionary containing cost rates for different stages. If None, default rates are used.
    margin_rates=None  # Optional: Dictionary containing margin rates for different cost components. If None, default margins are used.
) 

# Check if calculations are ready
if wbd.ready_for_calculation and wbd.ready_for_installation_output and wbd.ready_for_cost_output:
    # Export results to dictionary
    result = wbd.export_results_to_dict()
    print(result)
else:
    print("Calculation is not ready.")

Default Cost and Margin Rates

If cost_rates or margin_rates are not provided in the calculate_and_return_wellbore_parameters function, GeoDrillCalc will use default values. These default cost and margin rates can be found in the configuration files located at:

• geodrillcalc/data/fallback_cost_rates.json
• geodrillcalc/data/fallback_margin_rates.json

For information on aquifer codes and their definitions, refer to the VVG Aquifer Codes.

Results

The export_results_to_dict() method returns a dictionary containing the wellbore specifications and cost estimates. Overview of the results:

Installation Results

• screen_length: The length of the well screen (in metres).
• screen_diameter: The diameter of the well screen (in metres).
• open_hole_diameter: The diameter of the open hole (in metres).
• pump_inlet_depth: The depth at which the pump inlet is installed (in metres).
• minimum_pump_housing_diameter: The minimum diameter required for the pump housing (in metres).
• casing_stage_table: A table detailing the casing stages, including their top and bottom depths, casing diameter, and drill bit diameter.

Cost Results

• cost_estimation_table: Provides a breakdown of estimated costs for various components and stages of the drilling process, including:

  • stage: The stage of the drilling process (e.g., drilling rates, materials, time rates, etc.).
  • components: The specific components within each stage (e.g., pilot hole, casing, etc.).
  • low, base, high: The estimated cost ranges (low, base, high) for each component.

• total_cost_table: Summarises the total estimated costs for each stage of the process and the overall total cost:

  • drilling_rates: Costs related to drilling operations.
  • materials: Costs of materials used in the drilling process.
  • others: Additional costs not included in the other categories.
  • time_rates: Costs associated with time-based factors (e.g., rig standby, accommodation).
  • total_cost: The combined total cost of all stages and components.

This detailed output allows users to understand the specifications of the wellbore and provides a comprehensive cost estimate for the drilling operation.

Example Result

Installation Results

• screen_length: 139.484 metres

• screen_length_error: (125.536, 153.433) metres

• screen_diameter: 0.1016 metres

• open_hole_diameter: 0.1905 metres

• pump_inlet_depth: 105 metres

• minimum_pump_housing_diameter: 0.286 metres

• casing_stage_table(in metres):

casing_stages	top	bottom	casing	drill_bit
pre_collar	0.0	12.0	0.762	0.9144
superficial_casing	None	None	None	None
pump_chamber_casing	None	None	None	None
intermediate_casing	0.0	990.0	0.1143	0.2159
screen_riser	980.0	1000.0	0.1016	0.1905
screen	1000.0	1139.0	0.1016	0.1905

Cost Results

• cost_estimation_table(in AUD):

Stage	Components	Low	Base	High
drilling_rates	pilot_hole	None	210,804.58	None
drilling_rates	pre_collar	None	13,918.39	None
drilling_rates	superficial_casing	None	None	None
drilling_rates	pump_chamber_casing	None	None	None
drilling_rates	intermediate_casing	None	62,038.28	None
drilling_rates	screen_riser	None	455.33	None
drilling_rates	screen	None	3,164.57	None
time_rates	rig_standby_cost	1,600	1,800	2,000
time_rates	development_bail_surge_jet	25,000.00	31,250.00	37,500.00
time_rates	accommodation_cost	16,193.04	17,992.26	19,791.49
time_rates	site_telehandler_cost	2,698.84	2,998.71	3,298.58
time_rates	site_generator_fuel_cost	8,396.39	10,495.49	12,594.58
materials	cement	4,116.69	4,786.85	5,457.01
materials	gravel	204.79	238.13	273.85
materials	bentonite	3,328.05	3,697.83	4,067.62
materials	drilling_fluid_and_lubricants	5,145.34	5,717.04	6,288.75
materials	drilling_mud	2,714.99	3,016.65	3,318.32
materials	bore_flange_and_valve_spec	600	650	700
materials	cement_shoe	3,330.00	3,700.00	4,070.00
materials	packer_lowering_assembly	4,680.00	5,200.00	5,720.00
materials	pre_collar	2,438.40	3,048.00	3,657.60
materials	superficial_casing	None	None	None
materials	pump_chamber_casing	None	None	None
materials	intermediate_casing	313,121.44	354,552.94	395,984.44
materials	screen_riser	5,440.41	6,277.41	7,114.41
materials	screen	38,218.96	44,036.11	49,853.26
materials	centraliser	4,910.00	8,546.13	11,497.50
others	disinfection_drilling_plant	1,500.00	1,500.00	1,500.00
others	mobilisation_demobilization	59,974.21	59,974.21	59,974.21
others	installation_grouting_pre_collar	3,600.00	3,600.00	3,600.00
others	wireline_logging	11,280.89	12,534.33	13,787.76
others	fabrication_installation	76,105.18	84,561.31	93,017.45
others	cement_casing	38,785.46	48,481.82	58,178.18
others	pack_gravel	3,058.00	3,058.00	3,058.00
others	subcontract_welders	10,795.36	11,994.84	13,194.33

• total_cost_table(in AUD):

Stage	Low	Base	High
drilling_rates	230,581.02	290,381.15	350,181.28
materials	388,249.07	443,467.11	498,002.76
others	205,099.10	225,704.51	246,309.92
time_rates	53,888.27	64,536.46	75,184.65
total_cost	877,817.46	1,024,089.23	1,169,678.62

Notes:

• Fields with None indicate components or stages that are not required for this particular well. For example, "superficial_casing" and "pump_chamber_casing" might not be needed based on the well design and geology.

• For drilling_rates, the total cost margins are considered with the pilot hole drilling cost margin times the total well depth. This provides an estimate based on the base cost of drilling a pilot hole adjusted for the well's depth.