California Code of Regulations › Title 14 - Natural Resources › Division 2 - Department of Conservation › Chapter 4 - Development, Regulation, and Conservation of Oil and Gas Resources › Subchapter 2 - Environmental Protection › Article 4 - Well Stimulation Treatments › Section 1784 - Well Stimulation Treatment Area Analysis and Design

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) As part of an application for a permit to
					 conduct well stimulation, the operator shall conduct a well stimulation
					 treatment area analysis to ensure the geologic and hydrologic isolation of the
					 oil and gas formation during and following well stimulation treatment.
(1) The operator shall utilize modelling, or
					 other analysis, approved by the Division that will effectively estimate the
					 ADSA. The operator shall submit the ADSA and information supporting the
					 modeling or analysis to the Division.
(2) The well stimulation treatment area
					 analysis shall include identification and review of all well bores located
					 completely or partially within two times the ADSA to ensure the geologic and
					 hydrologic isolation of the oil and gas formation during and following well
					 stimulation. The Division may allow modification of the review area based on
					 modeling and analysis provided by the operator that demonstrates geologic and
					 hydrologic isolation of the oil and gas formation during and following well
					 stimulation treatment. For each well bore within the review area the well
					 stimulation treatment area analysis shall include the following information:
(A) Casing diagrams clearly indicating:
(i) Sizes and weights of casing;
(ii) Depths of shoes, stubs, and liner
					 tops;
(iii) Depths of perforation
					 intervals, water shutoff holes, cement port, cavity shots, cuts, casing damage,
					 and top of junk or fish left in well;
(iv) Diameter and depth of hole;
(v) Cement plugs inside casings, including
					 top and bottom of cement plug, with indication of method of
					 determining;
(vi) Cement fill
					 behind casings, including top and bottom of cement fill, with indication of
					 method of determining;
(vii) Type
					 and weight (density) of fluid between cement plugs;
(viii) Depths and names of the formations,
					 zones, and sand markers penetrated by the well, including the top and bottom of
					 the zone where well stimulation treatment will occur;
(ix) All steps of cement yield and cement
					 calculations performed;
(x) All
					 information used to calculate the cement slurry (volume, density, yield),
					 including but not limited to, cement type and additives, for each cement job
					 completed in each well; and
(xi)
					 All of the information listed in this paragraph for all previous redrilled or
					 sidetracked well bores.
(B) For directionally drilled wells, a
					 wellbore path giving both inclination and azimuth
					 measurements.
(3) The
					 well stimulation treatment area analysis shall include a review of all geologic
					 features, including known faults (active or inactive), within five times the
					 ADSA to ensure the geologic and hydrologic isolation of the oil and gas
					 formation during and following well stimulation. For all such geologic
					 features, the operator shall provide:
(A) An
					 evaluation of whether the geologic feature may act as a migration pathway for
					 injected fluids or displaced formation fluids; and
(B) An assessment of the risk that the well
					 stimulation treatment will communicate with the geologic
					 feature.
(4) If five
					 times the ADSA extends beyond the productive horizon being evaluated for
					 possible well stimulation treatment, then the well stimulation treatment area
					 analysis shall include a review of the geological formations adjacent to the
					 productive horizon. The operator shall assess the mechanical rock properties,
					 including permeability, relative hardness (using Young's Modulus), relative
					 elasticity (using Poisson's Ratio), and other relevant characteristics of the
					 geological formations to determine whether the geological formations will
					 ensure the geologic and hydrologic isolation of the oil and gas formation
					 during and following well stimulation.
(5) The well stimulation treatment area
					 analysis shall include identification of all water within two times the
					 ADSA.