Section 240.340  Proposed Well Construction and Operating Parameters

a)         Well Construction Records for Conversion Wells

            If the application is for the conversion of a previously drilled well, the applicant shall:

1)         submit a complete copy of all available geophysical logs run on the well; and

2)         submit a copy of the initial Completion Report or casing and cementing records of the well; and

3)         establish external mechanical integrity in accordance with Section 240.770(c) of this Part.

b)         Schematic Diagram

            The applicant shall submit a schematic diagram of the proposed injection well showing:

1)         the total depth and plugged back depth of the well;

2)         the sizes and depths of the holes drilled for the surface casing, mine or intermediate casing, and production casing;

3)         the sizes and depths of all casing in the well, and any additional casing to be used in the well;

4)         the amount of cement used for each string of casing in the well, and any additional cement to be used in the well;

5)         the size of the tubing and setting depth of the packer;

6)         the top and bottom depths of all perforated intervals in the casing; and

7)         the geologic name and the depth of the top and bottom of the proposed injection interval.

c)         Proposed Injection Rate

            The applicant shall submit the proposed injection rate expressed in average barrels per day.

d)         Injection Fluid

            The applicant shall submit the depth and geologic name of the formation(s) from which the injection fluid is to be obtained, a standard laboratory analysis of a representative sample of the fluid to be injected and the date the sample was obtained.  The sample shall be analyzed for at least the following parameters:  pH, Chloride, Total Dissolved Solids, and Specific Gravity.  The sample shall be obtained and analyzed no earlier than one (1) year prior to the date of filing of the application.

e)         Proposed Maximum Injection Pressure

1)         The applicant shall submit the proposed maximum injection pressure in accordance with the following formula:

            M.I.P. = (.80 - (.433 X Sp.Gr.)) X Depth - 14.7

      where

            M.I.P. = maximum allowable injection pressure

            Sp.Gr. = specific gravity of the injection fluid

            Depth = depth of the top of the injection interval

2)         If the proposed maximum injection pressure exceeds the amount calculated in accordance with subsection (e)(1) above, the applicant shall submit the most recent information showing that the proposed maximum injection pressure will not initiate or propagate fractures in the injection interval or overlying strata that could enable the injection fluid or the fluid in the injection interval to leave the permitted injection intervals.  The types of information that will be considered acceptable by the Department include, but are not limited to:

A)        A copy of the ticket and pressure chart from a "frac" or "acid" treatment in the injection interval in the proposed well, or from the same interval or a stratigraphically higher interval from a well within 1 mile of the proposed well, which shows the Instantaneous Shut-In Pressure (ISIP).  The maximum allowable injection pressure shall be 10% less than the ISIP measured at the surface unless the specific gravity of the treatment fluid is less than the specific gravity of the proposed injection fluid, in which case the ISIP shall be measured at the injection interval.

B)        The results of a step rate test from the injection interval in the proposed well, or from the same interval or a stratigraphically higher interval in a well within 1 mile of the proposed well which shows that the proposed maximum injection pressure will not propagate fractures allowing the injection fluid to migrate out of the permitted injection interval.  The maximum allowable injection pressure shall be 10% less than the pressure, measured at the surface, at which the formation broke during the test.

(Source:  Amended at 22 Ill. Reg. 22314, effective December 14, 1998)