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Thank you for contacting the Health and Safety Executive.

Dear Ada

Environmental Information Request Reference No: 201808287

Thank you for your request for information about:

Acid wash and stimulation monitoring

Your request was received on 20 August 2018e] and I am dealing with it in
accordance with the Environmental Information Regulations 2004. Under the
terms of the Regulations you are entitled to a response within 20 working
days of receipt.

If for any reason we are unable to meet this deadline we will keep you
fully informed of the reasons for this and will tell you when you can
expect a response.

Guidance on how the Health & Safety Executive deals with requests under
the Freedom of Information Act and Environmental Information Regulations
can be found on the HSE website at [1]http://www.hse.gov.uk/foi/index.htm

If you have any queries about this letter, please contact me. Please
remember to quote the reference number above in any future communications.

Yours sincerely

Dave

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References

Visible links
1. http://www.hse.gov.uk/foi/index.htm

Dear Ada

Environmental Information Request Reference No: 201808287

Thank you for your request for information about: Acid wash and
stimulation monitoring

Your request was received on 20 August 2018 and I am dealing with it under
the terms of the Environmental Information Regulations 2004. Please accept
my apologies for the delay in responding to you.

I have responded to each of your questions below:

1. Is the HSE notified when an operator performs the following injection
operations/at what stage is the HSE notified?

a. Acid wash

b. Matrix acidisation

c. Acid fracking

HSE response: HSE is notified of any well operation that could result in
an accidental release of fluids from the well or the reservoir to which it
is attached. This would include well stimulation operations. HSE is
notified at least 21 days before the start of these operations.

2. What information is reported (start/end date, injected volume,
injection pressure)

HSE response: The information reported to HSE is set out in Schedule 1 of
the Borehole Sites and Operations Regulations 1995. A copy is available on
the HSE website  [1]http://www.hse.gov.uk/pubns/priced/l72.pdf (it is
copied below for ease of reference).

Part I Notification under regulation 6(1)

The particulars required for a notification under regulation 6(1) are as
follows:

1 Name and address of the operator.

2 Particulars of the type of well, its number and its name.

3 Particulars of the rig or other plant which is to be used in connection
with the operations on the well.

4 Particulars of the surface equipment and of the circulation fluids to be
used to control the pressure of the well.

5 Particulars, with scale diagrams, where appropriate, of –

(a) the Ordnance Survey National Grid reference of the location of the top
of the well;

(b) the directional path of the borehole;

(c) the terminal depth and location; and

(d) its position and that of nearby wells and mine workings relative to
each other.

6 A description of operations to be performed and a programme of works
including –

(a) the dates on which operations are expected to start and finish; and

(b) a diagram showing details of the intended final completion or
recompletion of the well.

7 A description of –

(a) any activities during operations on the well which will involve a risk
of the accidental release of fluids from the well or reservoir; and

(b) such hazards.

8 In the case of a well which is to be drilled –

(a) particulars of the geological strata and formations and fluids within
them through which it may pass and of any hazards with the potential to
cause fire, explosion or a blowout which they may contain;

(b) the procedures for effectively monitoring the direction of the
borehole and the effects of intersecting nearby wells; and

(c) particulars of the design of the well, sufficient to show that it
takes account of the matters in sub-paragraph (a) of this paragraph, and
that it will so far as is reasonably practicable be safe.

9 In the case of an existing well –

(a) a diagram of the well;

(b) a brief history of the well including a summary of previous operations
and any problems encountered; and

(c) its present status and condition.

10 In the case of an abandonment operation details of the proposed sealing
or treatment.

3. Is this information available to the public?

HSE response: This is highly technical information which is not routinely
made public. However, a copy can be requested through FOI/EIR but some, or
all, of the information may be subject to exemption from disclosure.

The information supplied to you continues to be protected by the
Copyright, Designs and Patents Act 1988. You may re-use this information
(not including logos) free of charge in any format or medium, under the
terms of the Open Government Licence. To view this licence, visit
[2]http://www.nationalarchives.gov.uk/doc/o... or
write to the Information Policy Team, The National Archives, Kew, London
TW9 4DU, or e-mail: [3][email address].

If you have any queries about this letter, please contact me. Please
remember to quote the reference number above in any future communications.

If you are unhappy with the decisions made by HSE you may ask for an
internal review within two calendar months of the date of this letter by
writing to me.

If you are not content with the outcome of the internal review you have
the right to apply directly to the Information Commissioner for a
decision. The Information Commissioner can be contacted at:

The Information Commissioner’s Office

Wycliffe House

Water Lane

Wilmslow

Cheshire

SK9 5AF

Tel: 01625 545700

Fax: 01625 524510

Email: [4][email address]

Website: [5]http://www.informationcommissioner.gov.uk

Yours sincerely

Dave

Dave Salmon / OSDR Competent Authority Office / 

Energy Division ED7.1

Health & Safety Executive, Lord Cullen House, Fraser Place, Aberdeen, AB25
3UB 

(: Internal Direct Line 1441 | (: External Direct Line +44 (0)2030281441
| *: [6][email address]

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References

Visible links
1. http://www.hse.gov.uk/pubns/priced/l72.pdf
2. http://www.nationalarchives.gov.uk/doc/o...
3. mailto:[email address]
4. mailto:[email address]
5. http://www.informationcommissioner.gov.uk/
6. mailto:[email address]