安探1X高温深探井小间隙固井技术

廊固凹陷是华北冀中坳陷3大富油凹陷之一，为华北油田主要产油区，其油层埋藏深，温度较高，井身结构复杂。安探1X井是部署在华北冀中坳陷廊固凹陷的1口风险探井，四开φ127 mm尾管下深5 494 m，地层温度高达177℃，气层活跃，压稳技术难度大，同时环空间隙小，水泥环薄，对水泥浆高温稳定性、防气窜能力以及对水泥石抗压强度衰退问题提出挑战。针对安探1X井固井难点，筛选出抗高温防窜水泥浆体系，其具有良好的沉降稳定性和游离液稳定性，稠化时间可调，防窜性能强，同时具有180℃高温强度不衰退等特点；通过优选高温悬浮稳定剂，形成抗温180℃冲洗隔离液体系，180℃沉降稳定性小于0.03 g/cm3。在安探1X井φ 127 mm尾管固井中成功应用，水泥浆固井质量良好，为后期华北冀中坳陷的勘探开发打下了良好的基础。 

Cementing High Temperature Deep Well Antan-1X with Narrow Annular Spaces

The Langgu sag, one of the three sags rich in oil in the Jizhong Depression, north China, is the main oil producing area of Huabei Oilfield. The reservoirs are deeply buried and the formation temperatures are high. The well Antan-1x is an exploratory well drilled in this area. This well had complex well profile, and the φ 127 mm liner (in 4th interval) was run to 5,494 m, at which the formation temperature is 177℃. Gas zones at the completion depth are very active and are difficult to control with high density drilling fluids. Narrow annular spaces and hence thin cement sheaths impose challenges to the high temperature stability and anti-channeling ability of cement slurry, and the compressive strength of set cement. A high temperature anti-channeling cement slurry was formulated for use in the well Antan-1x. This cement slurry has good anti-settling performance and ability in minimizing the amount of free water. Its thickening time is adjustable. The compressive strength of the set cement under 180℃ does not retrograde. A flushing spacer was formulated with high temperature suspension stabilizer, and the settling rate of the spacer under 180℃ was less than 0.03 g/cm3. In cementing the φ 127 mm liner string of the well Antan-1x, high quality cementing job was done with the high temperature cement slurry and the spacer, laying a good foundation for the later exploration and development of the Jizhong depression in north China.