耐高温高压超高密度水泥浆体系的室内研究  

Laboratory Study on an HTHP Ultra-High Density Cement Slurry

作　　者：宋鹤 杨威 唐俊峰 刘翠微 王敬朋 林志伟 SONG He;YANG Wei;TANG Junfeng;LIU Cuiwei;WANG Jingpeng;LIN Zhiwei(CNPC Engineering Technology Research Co.,Ltd,Tianjin,300450;Engineering Technology Research Institute of Xinjiang Oilfield,Karamay,Xinjiang,834000)

机构地区：[1]中国石油集团工程技术研究有限公司,天津300450 [2]新疆油田公司工程技术研究院,新疆克拉玛依834000

出　　处：《钻井液与完井液》2021年第1期116-121,共6页Drilling Fluid & Completion Fluid

基　　金：中国石油天然气集团有限公司重大技术现场试验“准噶尔南缘和玛湖等重点地区优快钻完井技术集成与试验”(2019F-33)。

摘　　要：天湾1井是位于准噶尔盆地中部的一口超深预探井,井深为7500 m,井底压力为170 MPa,井底温度为160℃,针对该井高温高压的问题,以及目前超高密度水泥浆存在的流动性和沉降稳定性差、动态失水量较大、以及大温差下顶部水泥石强度出现过缓凝等问题,室内成功研制出耐高温高压超高密度水泥浆体系,水泥浆密度可达2.55 g/cm^(3),该体系主要由新型加重剂、微硅、高温稳定剂、600目硅石粉(粒径为0.025 mm)、新型微锰矿粉、悬浮剂、高温缓凝剂、高温降失水剂、高温减阻剂等组成。实验结果表明,该体系水泥浆流动度达到32 cm,同时具有较好的沉降稳定性能,顶部水泥石强度较高,防气窜能力强,在160℃、170 MPa下,稠化时间线性可调,动态失水量为40 mL,该水泥浆体系应用范围广泛,可通过调整外加剂掺量来满足天湾1井不同井深温度下的固井施工要求。The well Tianwan-1 is an ultra-deep exploration well located in the middle of the Junggar Basin,with depth of 7,500 m,bottom hole pressure of 170 MPa and bottom hole temperature of 160℃.A high temperature high pressure ultra-high density cement slurry was developed in laboratory to overcome the high temperature and high pressure,as well as the other problems related to ultra-high density cement slurries,such as poor fluidity,poor settling stability,high dynamic fluid loss,and over-retarding of the strength of the top set cement under big temperature differences,etc.The highest density of the cement slurry was 2.55 g/cm^(3).The cement slurry was developed with a new weighting agent,micronized silica,a high temperature stabilizer,powdered silica passing through 600-mesh screen,a new micronized manganese powder,a suspending agent,a high temperature retarder,a high temperature filter loss reducer and a high temperature friction reducer.Laboratory experimental results showed that the cement slurry had fluidity of 32 cm,good settling stability,high strength of top set cement and strong capacity of anti-channeling.The thickening time of the cement slurry is linearly adjustable at 160℃and 170 MPa.Dynamic filter loss of the cement slurry was 40 mL.The cement slurry can be used in a wide range of downhole conditions;by changing the concentrations of the different additives,the cement slurry can satisfy the needs of cementing operation at different downhole temperatures(hence different depths)in the well Tianwan-1.

关 键 词：超高密度水泥浆 大温差 耐高温高压 天湾1井 超深预探井 

分 类 号：TE256.6[石油与天然气工程—油气井工程]