液压式套管扶正器在侧钻水平井中的应用

常规侧钻水平井造斜段及水平段完井管柱居中困难，导致固井水泥环厚度不均，质量较差，易发生出水、出砂等问题，进而致使侧钻水平井生产寿命较短，严重影响了单井产量。现场多使用扶正器来提高套管居中度，但是常规扶正器存在扶正效果差、破坏井壁等问题，为此研制了液压式套管扶正器。该工具原始外径小、下入安全，膨胀后外径大、扶正能力强，能够极大地提高侧钻水平井完井管柱的居中程度，改善固井质量，延长侧钻水平井的生产寿命，提高产量和效益。该类扶正器现场应用简便，不影响正常的施工程序，在辽河和冀东油田进行了多口井的现场应用，效果显著。

Application of hydraulic casing centralizer in sidetracked horizontal well drilling

When drilling the buildup section and horizontal section of conventional sidetracked horizontal wells, the drilling tools are difficult to be centralized, leading to uneven cement thickness, and poor cementing quality, resulting in water and sand production. The problem would lead to low production rate and short service time of sidetracked wells. In field application, centralizer is commonly used to improve the casing centralizing degree, but conventional centralizer has poor centralizing effect and would break wellbore. Therefore, a type of Hydraulic casing centralizer was developed. The tool has small original outer diameter, safe tripping process, large expended outer diameter, and great uprighting capacity, so it can greatly improve the centralizing degress of the completion string of sidetracked horizontal wells. Furthermore, the technique can improve cementing quality, enlarge service time of sidetracked horizontal wells, and increase production rate and economical effect. The tools are simple being applied in field, with no passive effect on normal drilling process. The tools have been applied on many wells in Liaohe and Jidong fields with good effect.