钻井液与完井液2025，Vol.42Issue(1)：102-109,8.DOI:10.12358/j.issn.1001-5620.2025.01.011
抗高温固井用悬浮稳定型降失水剂的制备与应用
Preparation and Application of a High Temperature Suspension Stabilizing Filter Loss Reducer for Cement Slurries
摘要
Abstract
High formation temperature gradients prevail in the Qinghai Oilfield(Tsaidam Basin).High bottom hole temperatures in deep and ultra-deep wells plus high formation pressures from the over-pressurized formation belts impose rigorous requirements on cement slurries as to their high temperature high pressure(HTHP)filter losses and rheology,the settling stability and mechanical performance after experiencing heat impact.To deal with these situations,a suspension stabilizing filter loss reducer DFS-200 containing temperature-sensitive groups and branched chain structures was developed.Evaluation of the general performance of DFS-200 shows that it can reduce the high temperature filter loss of a cement slurry(with density between 2.10 g/cm3 and 2.30 g/cm3)to less than 50 mL,and the cement slurry still has zero free water,small density difference between the top cement and the bottom cement of less than 0.03 g/cm3,as well as good rheology and thickening performance.The DFS-200 treated cement slurry does not viscosify at low temperatures and does not thin at elevated temperatures.The strength of the set cement develops quickly,the transition time of the static gel strength of the cement slurry is short.The 200℃×48 h compressive strength of the set cement is greater than 30 MPa and does not decline.DFS-200 has been used many times in liner cementing operations in Tsaidam Basin and has gained good results,it has provided a technical support to improving the job quality of cementing the deep and ultra-deep wells in Qinghai Oilfield and also to ensuring the borehole integrity.关键词
降失水剂/支链结构/沉降稳定性/水泥浆/高温/深井Key words
Filter loss reducer/Branched chain structure/Settling stability/Cement slurry/High temperature/Deep well分类
石油、天然气工程引用本文复制引用
杜宇斌,刘子帅,吕斌,赵维超,周崇峰,樊荣华..抗高温固井用悬浮稳定型降失水剂的制备与应用[J].钻井液与完井液,2025,42(1):102-109,8.基金项目
青海油田公司科技项目"柴达木盆地复杂深井安全钻完井配套技术研究"(2023KJ0701). （2023KJ0701）
