Fracking company Cuadrilla has requested an urgent review of existing earthquake safety levels, in the hope permission to generate larger tremors will allow it to extract greater quantities of shale gas from Lancashire.
Currently the company must suspend drilling when quakes measuring over 0.5 magnitude are detected.
Though numerous legal challenges and protests were not enough to prevent the company from beginning explorative drilling at its Preston New Road site late last year, it is now the government’s “traffic light system” for seismic activity which the industry appears to consider the greatest threat to its survival.
Despite it emerging that senior figures in the company had believed they would not cause tremors serious enough to halt operations, the company has had to stop drilling on several occasions after surpassing government limits.
In results published today, Cuadrilla said since they began drilling in October last year, they had confirmed there is a “rich reservoir of recoverable high quality natural gas present”, but that the seismic operating limit remains a barrier to the industry.
Due to the earthquake limits, the company said it used “less than 14 per cent of the sand we had planned to inject into the shale rock”.
“An intentionally conservative micro-seismic operating limit during hydraulic fracturing, set at just 0.5 on the Richter scale, had … severely constrained the volume of sand that could be injected into the shale rock,” Cuadrilla said in a statement.
It said it has requested the Oil and Gas Authority “urgently review” the traffic light system to enable the Preston New Road wells to be “properly tested and produced effectively, without compromising safety or environmental protection”.
Cuadrilla chief executive Francis Egan said: “Cuadrilla and its investors remain committed to this opportunity. The potential for Lancashire and the UK has again been clearly demonstrated by the fracturing and flow-testing carried out at Preston New Road. We look forward to completing the job.