The perforate, wash, and cement (PWC) technique was developed to improve abandonment efficiency and enhance the quality of hydraulic isolation required to establish dependable barriers. In subsea scenarios, significant logistical challenges exist, such as the use of a large volume of spacers and high operational times for complete circulations, which can prolong the operations before actual cementing operations. The complete paper details the first four operations carried out in deepwater scenarios in Brazil, where PWC application in scenarios in other countries required adaptation for the unique characteristics of the operator’s wells.
PWC Technique
The PWC technique consists of a sequential operation that allows casing communication (perforation), annular cleaning (washing), and final cementing. Compared with conventional methods, PWC typically is more productive because all steps can be performed with a single bottomhole assembly (BHA) that allows sequential processes on the wellbore.
