Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 24 - Class VI Injection Wells and Facilities Underground Injection Control Program
Section 24-17 - Logging, Sampling, and Testing Prior to Injection Well Operation

Universal Citation: WY Code of Rules 24-17

Current through September 21, 2024

(a) During the drilling and construction of a Class VI injection well, the owner or operator shall run appropriate logs, surveys, and tests to determine or verify the depth, thickness, porosity, permeability, lithology, and salinity of any formation fluids in all relevant geologic formations to ensure the well meets the construction requirements of Section 14 of this Chapter and to establish accurate baseline data against which future measurements may be compared. The owner or operator shall submit to the Administrator a descriptive report prepared by a knowledgeable log analyst that includes an interpretation of the results of the logs and tests. At a minimum, the logs and tests shall include:

(i) Deviation checks measured during drilling on all holes constructed by drilling a pilot hole that is subsequently enlarged by reaming or another method. Deviation checks shall be at sufficiently frequent intervals to determine the location of the borehole and to ensure that vertical avenues for fluid movement in the form of diverging holes are not created during drilling;

(ii) Before and upon installation of the surface casing:
(A) Resistivity, spontaneous potential, and caliper logs before the casing is installed; and

(B) A cement bond and variable density log, or other approved device to evaluate cement quality radially with sufficient resolution to identify channels, voids, or other areas of missing cement and a temperature log after the casing is set and cemented;

(iii) Before and upon installation of the long string casing:
(A) Resistivity, spontaneous potential, porosity, caliper, gamma ray, fracture finder logs, and any other logs the Administrator requires for the given geology before the casing is installed; and

(B) A cement bond and variable density log, and a temperature log after the casing is set and cemented;

(iv) Tests designed to demonstrate the internal and external mechanical integrity of injection wells, which may include:
(A) A pressure test with liquid or gas;

(B) A tracer survey, such as oxygen-activation logging;

(C) A temperature or noise log; and

(D) A casing inspection log; and

(v) Any alternative methods that provide equivalent or better information and that are required or approved by the Administrator.

(b) The owner or operator shall take whole cores or sidewall cores of the injection zone and confining system as well as formation fluid samples from the injection zone(s).

(i) The owner or operator shall submit to the Administrator a detailed report prepared by a log analyst that includes:
(A) Well log analyses (including well logs);

(B) Core analyses; and

(C) Formation fluid sample information.

(ii) The Administrator may accept data from cores and fluid samples from nearby wells if the owner or operator can demonstrate that such data are representative of conditions in the wellbore.

(c) The owner or operator shall record the formation fluid temperature, formation fluid pH and conductivity, reservoir pressure, and static fluid level of the injection zone(s).

(d) The owner or operator shall determine fracture pressures of the injection and confining zones and verify hydrogeologic and geomechanical characteristics of the injection zone by conducting a pressure fall-off test, any other test requested by the Administrator, and:

(i) A pump test; or

(ii) Injectivity tests.

(e) The owner or operator shall provide the Administrator with the opportunity to witness all logging and testing by this section. The owner or operator shall submit a schedule of such activities to the Administrator prior to conducting the first test and shall notify the Administrator of any changes to the schedule thirty (30) days prior to the next scheduled test.

Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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