SOP Drilling

This Standard Operational Procedure (SOP) aims to:

1.1. prevent and or eliminate work accidents during drilling activities;

1.2. and regulate the stages and control the drilling process according to the standards.

2. SCOPE

This SOP describes the technical process of drilling from the determination of the drill point to the transfer of the drill tool to the next point, this SOP applies to employees of PT AE and its Contractors.

3. LIABILITY

3.1. Geologists are responsible for:

a. ensure drilling activities run safely and controlledly;

b. prepare a drilling work plan along with the targets you wish to achieve;

c. ensure drilling activities in accordance with targets and work plans that have been prepared in advance effectively;

d. create drilling maps and drilling correlations;

e. report damage to the drill tool and make the Goods Procurement Letter / Repair Letter;

f. and report the results of drilling activities monthly into the Monthly Report of Drilling Activities to the Head ofEngineering Division.

3.2. Wellsite is responsible for:

a. ensure drilling activities run safely and controlledly;

b. conduct safety talks in each work area intended to inquire about the health condition of subordinates, provide guidance to subordinates about the work to be done, the hazards arising and the means of control;

c. determine the drill point in the field according to the geologically prepared work plan;

d. describe the cutting stones (chips)and or the results of coring(core)into the field book;

e. carry out the preparation, transport andstorage of drilling samples;

f. report the results of activities in the field to geologists daily in the Drilling Daily Report Sheet;

g. and create drill logs and drilling data summaries.

3.3. The Head of the Drill Team is responsible for:

a. ensure drilling activities run safely and controlledly;

b. ensure the condition of the drill equipment and equipment is feasible and safe to use to achieve the specified results and targets;

c. coordinate with the Canteen to conduct daily consumption of the Drill Team during drilling activities;

d. carry out the mobilization and demobilization of drilling devices;

e. carry out the maintenance of drilling devices;

f. and report the damage of the drill tool to the Geologist;

3.4. The driller is responsible for:

a. ensure drilling activities run safely and controlledly;

b. conduct drilling activities in accordance withwellsite's designated point;

c. coordinate with Wellsite in determining drill points in the field;

d. together with wellsite carrying out the preparation, transport and storage of drilling samples;

e. carry out the maintenance of drilling devices;

f. and keep the drill tool from damage, wear or unwanted natural conditions such as pinched pipes.

3.5. The driller assistant is responsible for:

a. assist drillers in carrying out drilling activities;

b. and together with Wellsite and Driller prepare the drill point to be drilled next.

3.6. The Helper is responsible for:

a. assist Wellsite, Driller and Assistant Driller in carrying out all drilling activities.

4. DEFINITION

4.1. The drill point is a point/hole (in the form of coordinates and elevation) carried out drilling activities.

4.2. Chips are pieces of rock resulting from drilling activities.

4.3. Core is a coal sample taken using a corebarrel.

4.4. Coring is a rock cutting and lifting activity using core barrels.

4.5. Cutting is a rock cutting and lifting activity with open hole technique using drill bits.

4.6. Open hole is a drilling technique without the use ofcasing.

4.7. Casing is a sheath pipe the same size as the drill bit to protect the pipe/drill bit from rock collapse.

4.8. Sample is an example of coal obtained from cutting results or coring results that are treated specifically according to standards and will be researched quality in the laboratory.

4.9. Core barrel is a sample taker from inside the rock body.

4.10. Split tube is the tube where the sample binds/keeps it from rotating with the core barrel.

4.11. Core box is a wooden box where the core sample is placed to facilitate the description and documentation of the sample core formed according to the diameter of the sample core and its adjusting length (usually 1 m).

4.12. Roof is the upper limit of coal layer contact with other rock layers.

4.13. Field books are stationbooks while writing down all drilling activities in the field.

4.14. Drilling Daily Report is a daily activity report sheet containing date, location, tools, description of rocks and responsible reports.

4.15. Drill Log is the result of a description of the rocks of each drill point poured into a column.

4.16. Drilling Data Summary is a summary of drilling activity data.

4.17. Drilling Map is a drilling map that includes the drill point, the situation around drilling activities, and land ownership when the data already exists.

4.18. Drilling Correlation is a two-dimensional cross section image of a designated drill section.

4.19. The drill section is a hayal line of a collection of drill points.

4.20. Monthly Report on Drilling Activities is a report covering the progress of the drilling process and evaluation of the performance of the Drill Team on a monthly basis.

4.21. Letter of Procurement of Goods is a letter of application for procurement of drill tools to the management.

4.22. Tool Repair Letter is a letter requesting the repair of the drill tool to the management.

4.23. Safety Talk is a K3 meeting conducted by a supervisor with his men to provide guidance on K3 related to the work to be done or discuss matters related to K3 such as procedures, recent accidents, etc. Usually done at the beginning of the work grind where the condition of the employee is still excellent.

5. REFERENCES

5.1.       JORC Code.

5.2. SNI 7568:2010 on Mineral and Coal Exploration Glossary.

5.3. SNI 13-6978.3-2003 on The Competence of Geological Special Technical Personnel – Part 3: Exploration Drilling Technicians.

5.4. SNI 2436:2008 on Procedures for Recording and Identification of Core Drilling Results.

6. DESCRIPTION

6.1. The determination of the drill point is carried out by Wellsite in cooperation with the Drill Team Head, Driller, Assistant Driller and Helper on the orders andplans of geologists.

6.2. Making the road to the drill site can be done in conjunction with the determination of the drill point.

6.3. Manufacture of drill sites that include the manufacture of lasbits, flattening the ground for the footing of the drill machine etc.

6.4. Moving drill machines and drilling-supporting equipment.

6.5. Setting and assembling drill machines and drilling-supporting equipment.

6.6. The letter of duty to begin drilling at the site is provided bythe Geologist with management approval.

6.7. Drilling implementation, including the following activities.

A. Perform non-coring drilling from the initial depth up to the specified depth estimate (as instructed by geologist/wellsite). Using hq size drill bits (length 20 cm) and AW size pipes (length 1.5 m), then measure and record drilling depth, cutting description and make estimates for coring.

B. Perform drilling (Target Hole) coring from the estimated depth of the coalroof or from the foundsigns ofcoal (according to the instructions from geologist / Wellsite). Using DiamondCore drill bit type Surface Set for coal coating, while for other rock/litology layers the drill bit used can be adjusted. The type of tube core barrel is Triple Tube (length1,5meters).

C. Perform the cutting and lifting of the core sample if the corebarreltube is full or something that requires the samplecore to be cut and lifted before the core sample tube is full (Driller decision).

D. Measure and record the depth of cutting drilling and lifting of core samples in the field book.

E. Measure and record the progress of the depth of the cast in the field book.

F. Remove the core sample with a split tube by spraying it using water. It is forbidden to remove core samples and split tubes by beinghit -hit or in other ways that can harm the condition of the sample core in a state of intact and good.

G. Measure and record the length of the sample core obtained before it is placed on the core box.

H. Place and arrange the sample core in the core box according to the instructions on the treatment and treatment of the sample core. (See SOP Treatment and Treatment of Coring Coal Samples )

Ⅰ. Perform casting drilling until the coal seam is taken all or up to the instructions of the corporate supervisor.

A. Drilling is discontinued in accordance with thecompany'ssupervisoryinstructions ( Geologist /Wellsite or designated).

K. Remove one drill pipe after another that has been entered until completion. The removed drill pipe is collected and placed not too far from the drill machine.

6.8. Deassembling the drill machine until the smallest unit to be easily transported to the next point specified by Wellsite after coordinating with the Driller.

6.9. Record every drilling incident in the field book in detail(See FIELD BOOK FILLING SOP).

6.10. Fix immediately if there is damage in the drill machine or its support equipment/ equipment, then the Head of the Drill Team immediately reports to the Geologist so that procurement/replacement measures can be taken.

6.11. The drilled location is marked in the form of a peg, the size of the peg is adjusted to the diameter of the drill hole. Write the location code and total drill depth according to the instructions. Or it can also be by using a temporary peg from a tree branch. While the location code can be written on a yellow ribbon using a permanent black marker.

7. RELATED DOCUMENTS

7.1. SOP Treatment and Treatment of Coring Coal Samples.

7.2. SOP Collection and Treatment of Core Sample.

7.3. FIELD BOOK FILLING SOP.

7.4. JSA Pulling Drill Pipe.

7.5. JSA Issues Core Sample.

8. APPENDIX

8.1. Drilling Daily Report Format.

8.2. Drill Log Format.

8.3. Drilling Data Summary Format