Hydraulic Fracturing , Seismic Activity at Preston New Road and Well Integrity -Tests and Reporting
Dear Oil and Gas Authority,
Regulatory role of OGA
1) i) Is the OGA monitoring the operations at Preston New Road in real time? if yes,
ii) what job position is undertaking this task?
iii) by what system?
iv) if via written reports, please clarify how frequently these reports are required to be sent from the operator to OGA.
2) Once hydraulic fracturing has commenced:
i) please provide a document/ correspondence or link explaining the OGA's regulatory position regarding the role of the
• And/ or the Independent Well examiner
in checking the well integrity.
ii) is there a requirement for OGA/ independent Well examiner to make a site visit? If so, please state the date(s) of the visit(s) to Preston New Road by OGA and/ or the Independent Well examiner.
iii) Please confirm, answering 'yes' or 'no', if a desktop examination of data sent by the operator to OGA is adequate to examine well integrity.
3) Please answer ‘yes’ or ‘no’ to this question.
Does OGA state that there a requirement to run a Cement Bond Log Test for EVERY time the Seismic activity is measured at or above 0.5ML?
4) Is there a requirement for OGA/ Independent Well examiner to make a site visit after seismic events at or greater than 0.5ML? If so, please state the dates of these visits to Preston New Road by HSE and/ or the Independent Well examiner.
5) Which of the following methods are permissible to satisfy the OGA that well integrity has been checked? Please state 'yes' or 'no' for EACH of the following procedures, and if any require additional measurements to be undertaken:
• Checking the annular pressure at the surface
• Pressurising the well with liquid nitrogen and checking for loss
• Running a Cement Bond Log
• As is stated in https://cuadrillaresources.com/wp-conten...
if a ‘vibration monitoring array’ be utilized to assess the impact.
6) I refer to the following document available at
i) Please state if OGA require the operator to provide them with Well Integrity testing after any seismic events occurring during pumping which have occurred within the 'amber zone' 0.0Ml- 0.5ML;
ii) Please state if OGA require the operator to provide them with Well Integrity Testing after any seismic events occurring during 'trailing events' where seismic activity 0.5ML:
‘A trailing event with magnitude >0.5 ML will require a well integrity check be performed and reported in the same manner as those events detected while pumping is taking place’.
Well Integrity Testing at Preston New Road
7) i)Please confirm who is checking the well integrity onsite, and how you are informed of this.
ii) Please state clearly if it is Cuadrilla, or their contractor (eg Schlumberger ), or another agency.
8) Please state 'yes' or 'no' if the well integrity was checked after each of the seismic events measured at or above 0.5ML during pumping:
• 0.48 ML on Wednesday 24th October
• 0.8 ML on Friday 26th October
• 0.8 ML on Saturday 27th October (deemed a trailing event by Cuadrilla)
and 1.1 ML on Monday 29th October
and provide the time of the testing along with a copy of each report.
9) Please provide a copy of all written communications from Cuadrilla to OGA from 22nd October 2018- 9th November 2018, to include a copy of all daily reports/ other reports made to OGA.
As each of these questions is numbered, I would be grateful if you could respond to each of these questions, utilising the same numbers for ease of reading.
I understand that all the documents I have requested are documents that relate to either your regulatory position, or documents that the operator should have provided you with at the time you receive this, as per their duties.
Should the operator have failed to do this completely, please advise me of this rather than delay the whole request; I am happy to accept any documents as additional responses.
Dear Ms Chuntso,
Please find attached a letter from the OGA indicating that the time limit for responding to your request needs to be extended.
Dear Ms Chuntso,
Please find attached a response from the OGA to your FOI request.
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