Borehole Questionnaire

BOREHOLE QUESTIONNAIRE

Because each borehole has its own characteristics, like diameter, depth and the type of infrastructure around the wellhead, no two borehole sensors, their cables and periphery are built exactly the same. In order for Güralp Systems Ltd. to optimally customise the equipment you want to purchase for your situation, we would like to know as many details about your borehole as possible. For this reason we ask you to fill out this questionnaire. The information you provide here does not only help our sales team to put together the proper equipment solution for you. It will also enable our installation team to plan in detail for the deployment and to avoid lengthy and costly delays once in the field.

Please take the time to answer each question with as much detail as possible. If you do not know an answer, try to find it out or mark the question as “not known”. If there is any additional information about your borehole, please provide it to us as well. And rest assured, the information you provide here will be treated by us in absolute confidentiality.

Full name *

Organisation *

Your email address *

Phone Number *

Section 1 Questions about the borehole

1.1 What is the name of the borehole/borehole site and where is it located? Please provide geographical coordinates.ggest competitor to Güralp? *

1.2 What is the depth of the borehole and what depth installation is planned for the instrument? *

1.3 When was the borehole drilled? *

Please provide the drilling report or any other hole-logs that are available. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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1.4 While drilling, did you encounter hydrocarbon bearing formations? If so are the liquid or gaseous hydrocarbons currently present in the hole? *

1.5a Is the borehole wet or dry? *

Wet

Dry

Unknown

1.5b If the borehole is wet, at what depth is the fluid level? *

1.5c Is the fluid in the borehole corrosive? *

Yes

No

Unknown

1.6 What is the temperature at installation depth? If not known, what is the geothermal gradient in the borehole? *

1.7a Is the borehole truly vertical? *

Yes

No

Unknown

1.7b If the borehole is not vertical, by how many degrees does the complete borehole deviate from the vertical? *

1.7c What is the actual deviation at the installation depth? *

Section 2 Questions about the casing

2.1 Is the borehole cased? *

Yes

No

Unknown

2.2 If yes, is the whole borehole cased or are only sections of it cased? *

2.3a If the borehole is cased, what is the internal diameter of the casing? *

2.3b If the borehole is not cased, what is the internal diameter of the hole? *

2.4a Is the casing diameter consistent through the hole? *

Yes

No

Unknown

2.4b If the diameter of the casing changes with depth, what is the exact inner diameter at installation depth? *

2.5 What material is the casing made of? (Steel, PVC, other material) *

2.6 What is the wall thickness of the casing? *

2.7 Is the inside of the casing clean and free of protrusions? *

Yes

No

Unknown

2.8 Can you provide a copy of a video survey from inside the casing? *

Yes

No

2.9 What is the condition of the casing at installation depth? Is it corroded? *

2.10 Is the casing deformed anywhere inside the borehole? *

2.11a Has the condition of the casing been measured with a calliper? *

Yes

No

2.11b If yes, is there a calliper report available? *

Please provide the calliper report if available. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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2.12a Has the casing been properly cemented into the hole? *

Yes

No

2.12b If yes, which method was used to cement? (Tremie Pipe, “plug and displacement” or others?) *

3.2a How is the wellhead capped? *

Section 3 Questions about the wellhead

3.1 Does the wellhead... *

Protrude above ground level?

Lie flush with ground level?

Lie below ground level?

Please provide a picture and relevant measurements. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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3.2a How is the wellhead capped? *

3.2b Does the cap allow for routing of the cable/s? *

Please provide a picture or a detailed drawing. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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3.3 How do you plan to secure the cable/s to the wellhead to prevent them from slipping into the borehole after installation? *

3.4 Is there a blowout preventer/Christmas tree on the wellhead (see also question 1.6) *

Yes

No

Section 4 Infrastructure and accessibility

4.1a Is there a concrete pad around the wellhead? *

Yes

No

4.1b If yes, what is its size? *

Please provide pictures or diagrams if you have them. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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4.2 Is there a building or structure around the wellhead? *

Yes

No

If yes, please provide a diagram of the layout. Permitable files are: pdf, doc, docx, xls, xlsx (Max 250 KB) *

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4.3 Where will the digitiser and power supply be housed? *

Please provide a diagram of the layout Max 250 KB. Permitable files are: pdf, doc, docx, xls, xlsx *

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4.4 How are the cables laid between the borehole and digitiser/power supply? We strongly recommend the use of metal conduit from the digitiser/power supply all the way down into the first few metres of the borehole. *

4.5 Can a tripod be installed and used over the wellhead? *

Yes

No

4.6a Is a winch available on site? *

Yes

No

4.6b If yes, is it manual, hydraulic or electric? What is its' load rating? *

4.7a Is electric power available at the wellhead? *

Yes

No

4.7b If yes, please describe the power solution in details (mains, solar, cells, batteries, generator?) *

4.8 Is there protected space to store access cable around the wellhead after installation? *

Yes

No

4.9 How are you planning on installing and weather protecting the peripheral equipment for our sensor at the wellhead (Surface control box, power and telemetry equipment?) *

4.10 How accessible is the borehole? How close can you get to it with a car/small truck? *

4.11 How long does it take to get from the planned accommodation to the borehole site? Which means of transportation will be used for the transfer? *

4.12a Is the general area around the well prone to flooding? *

Yes

No

4.12b If yes, how do you plan to prevent the well and the infrastructure around the wellhead from flooding? *

Section 5 Additional questions

5.1a Are other scientific instruments (strainmeter, tiltmeter) currently installed in the borehole? *

Yes

No

5.1b If yes, will they stay in the hole while the Guralp sensor is installed? *

Yes

No

5.1c If they will stay in the hole, please describe the type of instrument(s) and give the exact outer diameter of the downhole cable(s) used for data transmission *

5.2 What plans do you have for lightning and surge protection around the well? *

5.3 Local Testing. Güralp recommends that before deployment in a remote or difficult to access site, all borehole systems are tested post shipping from the UK to the county of use, but before transporting to the final deployment site. This is to ensure no damage occurred during the unsupervised freight process. Do you have a facility for this local test? *

Yes

No

5.4 Are there any additional details regarding the borehole, wellhead that is of concern to you or that we should be notified of? *