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Intervention operations: Coiled tubing remedial intervention work starts on

Taqa Bratani’s Tern Alpha platform.

Photo: Taqa Bratani.

Yet, it says, the industry needs to do

Production more to raise the visibility of the value of well interventions. It also needs to share technical experiences among operators within a similar “playing feld”, such as the North Sea.

WIEN, whose organizing committee includes Shell, Marathon Oil, TAQA

Bratani, EBN (Energie Beheer Nederland), and Oil & Gas UK, is attempting to change the situation through use of benchmarking data, sharing the results, and extending its initiative into other regions.

Results to date indicate a broad range of performance in well intervention activities, suggesting there are opportu- nities for raising operator and industry performance.

European benchmarking

Using 2010 data from 13 companies, that included 2104 wells and 1200 well inter- ventions, WIEN set out to benchmark the performance of well intervention activities in Europe, targeting production optimization and improvements.

All types of well intervention activity were frst predefned and standardized.

Then, using an independent third party, agreed anonymized performance data

Sharing related to well interventions from the participating operators is collated.

Oil & Gas UK provided data from intervention lessons

UK operators and EBN, (Energy

Administration of Netherlands), provided

By Elaine Maslin data from European operators outside

A group of operators in the North

In many cases, total annual production the UK.

associated with well intervention opera- The data covered: total number of

Sea is taking a joint approach tions exceeds annual production from interventions performed during the calen- to barrel chasing through well new wells drilled in the same year. dar year; total cost of each intervention;

That is according to the Well Interven- category types; technical success rate for intervention. Could other tion Excellence Network (WIEN), a group those interventions; and total production regions do the same?

initiated by Shell Europe three years ago. contribution during the frst year post-job.

To compare performance data, inter- ventions were differentiated as oil and

Performance benchmarking across participating operators gas wells, and by type of well: onshore;

Ofshore Ofshore offshore platform wells; wells on nor-

Onshore platform NUISubsea Total mally unmanned installations (NUI); and

Number of participating subsea wells. Intervention techniques operators 5 9 75 13 were sorted into three broad groups,

Total number of wells 964 616389 135 2104 based on whether they restored produc-

Total number of interventions 824 236 117 23 1200 tion, for example integrity fxes, or if they % of interventions 85% 38%30% 17% 57% maintained production, such as through

Technical success rate 66% 57% 66%96% 65% water washes, scale squeezes, or if they 2010 production 384 157 107 194 842 generated additional production, for

Intervention gains (MM bbl) 3525 68 74 example by adding perforations.

% contribution to production9% 16% 6% 4% 9%

A low success rate in plunger lifting

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