Sub Standard Graphics 3D JPH173716 00000

High temperature 812WAB® enables shut-in well re-lining

  • WELL TYPE
    High MW geothermal producer
  • RESERVOIR TYPE
    Basement
  • PRODUCT PLACEMENT
    9 5/8" casing
  • $8MM CAPEX SAVINGS
    Realized via enhanced work-over vs new drill well
  • HIGH TEMPERATURE & PRESSURE WAB
    Enabled enhanced CAPEX-effective well construction
  • WELLTEC BREAKTHROUGH SUCCESS
    In renewable's market segment with high temp WAB
  • LOCATION
    Philippines

Background

A geothermal well operator had to shut in one of its most prolific producers due to 9 5/8” casing failure and the loss of the 7” slotted production liner from acidic corrosion.

Welltec® offered a 812WAB solution providing the foundation for pressure support to the column of cement slurry placed above, preventing the curing cement from becoming contaminated.

The 812WAB would also offer anchoring support to the casing string in the event of thermal contraction or expansion of the casing string during production or shut-down operations.

Operations

The standard 812WAB was adapted to incorporate non-elastomeric isolation valves & burst discs to facilitate bleed off in the event of high-pressure steam build-up behind the casing. 812WAB was run just above the High CRA 7” casing tailpipe and set inside the existing 9 5/8” casing. 2nd stage cementing was performed above the installed 812WAB.

During deployment, water flooded the well to keep temperatures ≤ 212°F—full production temperatures will be 545°F. The adapted, standard 812WAB supported the cement column during curing and prevented free-water/acid from contaminating the cement or reaching the surface.

Achievements

This was the 2nd time a Welltec Annular Barrier® (WAB) has been used to revive a geothermal well.

This job also marked a continuation of Welltec working within the geothermal market, in the Philippines. The client provided estimates that a new well would have cost the client upwards of $9mm.

Welltec’s facilitated a life-of-well, CAPEX-effective well-rejuvenation methodology, proving the value of engineered well remediation techniques.

This initial success lead the client has purchased another 1214 & 812WAB for use in upcoming wells to address the same issue.
1036X518 High Temperature 812Wab Enables Shut In Well Re Lining 00000 Min

Tools Applied