摘要
南海西部石油公司自营钻探成功的崖城２１—１—３井，井深４６８８ｍ，是一口高温高压并存的天然气深探井。测试证实，地层孔隙压力达１０４．７０ＭＰａ，井底温度为２０６℃，压力梯度为２２．７６ｋＰａ／ｍ，地温梯度达４．４２℃／１００ｍ。崖城２１—１—３井是在对同构造上的１井和２井的认识基础上，应用成熟、实用的先进技术，克服了施工中出现的复杂情况钻成的。通过分析总结１井和２井的资料，在充分认识地层压力和地层破裂压力的基础上，共提出４套井身结构方案，经过充分比较，采用方案四，并针对该方案的不足之处，采取相应的技术措施；在施工过程中遇到了严重的套管磨损问题，通过修补回接更换部分套管和对套管进行保护，保证了２４４ｍｍ套管下到设计井深；通过评估，选择了Ｍｉｌｐａｒｋ公司的Ｐｙｒｏ—ｄｒｉｌ高温水基钻井液体系，在实际使用中，通过严格控制膨润土含量，钻井液显示出良好的高温热稳定性；在密度为１．３３ｇ／ｃｍ３的钻井液中固１７８ｍｍ尾管，技术难度较高，固井获得成功，为以后积累了经验。在回顾这口井从设计、作业准备到现场施工的基础上，总结了这口井使用的技术。
The Well Ya 21—1—3 successfully drilled to a depth of 4 688 m by the Nanhai West Corporation by way of raising funds independently is a deep gas explortion well with both high temperature and high pressure.By means of well testing it is proved that the formation pore pressure is 104.70 MPa,the bottom hole temperature 206℃,the pressure gradient 22.76 kPa/m and the thermal gradient 4.42℃/100 m.Based on the understanding of Wells Nos 1～2 drilled on the same structure,the Well Ya 21—1—3 was successfully drilled through adopting the mature,practical and advanced techniques and overcoming the complicated conditions encountered during operating.By way of analyzing and summarizing the data on Wells Nos 1～2 and on the basis of fully understanding the formation pressure and fracture pressure,four casing program plans are proposed,Plan 4 being adopted through well comparing.The relevant technical measures were used for remedying the deficiencies of the plan,i.e.because the serious casing wear problem was always encountered in the process of operating,through the patching,tieback and replacement of the casing and protecting the casing against wear,it was ensured to run the 244 mm casing to the designed setting depth;through evaluation,the high temperature water base drilling fluid system (Pyro drill) developed by Milpark Co.was choosed and in practice,a good thermal stability of high temperature was showed by means of strictly controlling the bentonite content in the drilling fluid;it was difficult in technology to cement 178 mm liner in the drilling fluid with a density of 2.33 g/cm 3,but the well cementing was still successful,by which some experiences were accumulated for the future.On the basis of the review from well design,preparation to spot operation,the techniques used for this well are summarized and the drilling technology suitable for the deep exploration well with high temperature and high pressure is analyzed in the paper.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1999年第1期79-82,共4页
Natural Gas Industry
关键词
天然气
海上油气田
钻井技术
High temperature,High pressure,Natural gas,Exploration well,Casing program,Drilling fluid,Well cementing
