PRIMARY ACCOMPLISHMENTS OF SLIM HOLE CEMENTING

Kelcon reservoir is a low pressure, low permeability and less potential reservolr in Liaohe oilfield. The wells overthere were usually of 1, 000~2, 200 m deep drilled with φ215 mm bit and cased with φ139.7 mm casing. Their cementing was conducted ordinarily with seven cementing aggregates and four to five cement tank trucks. Today the drilling technology is changing to slim hole drilling with φ165 mm bit and φ127 mm casing and some cementing difficulties were encountered. By means of proper cementing rheology design, adjustment of location of casing centralizers, optimization of cementing engineering parameters selection of chemical additives and improving cement slurry recipe, the difficulties of cementing this kind of slim holes were smoothened and cementing job can be done with less expenses on casing, cement, chemical additives, cementing auxiliaries and number of cementing aggregates engaged.