Cementing technology of production casing in ISHPINGO block,Ecuador
The ISHPINGO block is located in the east of the Oriente Basin,Ecuador.It is a medium-high porosity and high-permeability reservoir with edge-bottom water.The cementing of production casing in this block has the characteristics of great difficulty in preventing stratum fluid from channeling,in removing mud cake of borehole wall,close distance between top boundary of oil layer and upper casing foot,narrow annular gap,high well inclination,etc.At the same time,the production starts 4-5 days after finishing the cementing,which requires high wellbore integrity.Aiming at the problems of early pay zone,by intro-ducing thixotropic agent,latex,optimizing expansion agent and the performance of cement slurry,etc.,the cement slurry suitable for this block is formulated,which has the characteristics of high static gel strength of early stage,rapid development,short transition time,high compressive strength and micro-expansion.Meanwhile,the matching cementing technology suitable for ISHPINGO block is formed by using the multi-effect pre-liquid system,rotating cement head,rotating float shoes cementing technology etc.In 2022,the casing cementing operation of 6 wells in the ISHPINGO block was completed,the cementing quality qualifi-cation rate was 100％,and the whole well interval quality rate was above 85％in 4 wells.This cementing program can effectively solve the problem of cementing quality of the pay zone in ISHPINGO block,ensure wellbore integrity,meet the requirements of subsequent perforation and production,and is of great signifi-cance to shorten the well construction cycle and casing cementing operations in the similar production zone.
ISHPINGO blockcementing of production casingstrong thixotropylatex cement slurryhigh porosity and high permeability
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