Precise Dynamic Managed-Pressure Cementing Technologies for ϕ139.7 mm Liner Cementing in Well Hutan-1
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摘要:
呼探1井ϕ139.7 mm尾管固井时封固段长、井底温度高，导致存在漏失与溢流风险大、对水泥浆性能要求高及水泥浆稠化时间不易控制等技术难点。为解决上述技术难点，在该井ϕ139.7 mm尾管固井段进行了精细动态控压固井技术试验。通过优化水泥浆配方、精细设计浆柱和优化设计套管扶正器安放位置，制定确保井筒动态压力介于地层孔隙压力与漏失压力之间等的技术措施，利用精细控压钻井装备，实现了控压下尾管、注水泥和水泥浆候凝，最终实现了全过程精细动态控压固井，该井ϕ139.7 mm尾管固井质量合格。呼探1井ϕ139.7 mm尾管精细控压固井成功，表明精细控压固井能够提高超深井长封固段窄安全密度窗口地层的固井质量，可为准噶尔盆地南缘深层油气勘探提供技术保障。
Abstract:Due to long cementing intervals and high bottomhole temperature, the ϕ139.7 mm liner cementing in Well Hutan-1 was exposed to various technical difficulties, such as high lost circulation and overflow risks, high requirements on the performance of the cement slurry, and difficult control of the thickening time of the cement slurry. Precise dynamic managed-pressure cementing technologies were tested in the ϕ139.7 mm liner cementing section in this well to address the above technical difficulties. Specifically, the cement slurry formulation was improved, the slurry column was precisely designed, and the casing centralizer placement was optimized. Technical measures were developed to ensure that the dynamic wellbore pressure was between the formation pore pressure and the lost circulation pressure, and the precise managed-pressure drilling equipment was utilized. Managed-pressure liner running, cement slurry injection, and waiting-on-cement were thereby implemented. As a result, a “whole-process” precise dynamic managed-pressure cementing was ultimately achieved. The ϕ139.7 mm liner cementing in Well Hutan-1 was considered up to standard. The successful implementation of precise managed-pressure cementing during the ϕ139.7 mm liner cementing in Well Hutan-1 indicates that precise managed-pressure cementing can effectively enhance the cementing quality of long cementing intervals of ultra-deep wells in formations with narrow safety pressure window and can provide technical assurances for the exploration of deep oil and gas at the southern margin of the Junggar Basin.
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Keywords:
- ultra-deep well /
- liner cementing /
- cement slurry /
- managed-pressure cementing /
- Well Hutan-1 /
- Junggar Basin
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表 1 水泥浆设计用量及性能
Table 1 Design dosage and performance of cement slurry
水泥浆 封固井段/
m密度/
（kg·L−1）水泥浆
用量/m3温度/
℃压力/
MPa稠化时间/
min24 h抗压
强度/MPa静胶凝
时间/s稠度系数 流性指数 领浆 3 523～5 300 2.10 24 143 158 525 18.8 4 130 0.933 0.666 中间浆 5 300～6 100 1.90 12 143 158 401 23.2 1 955 0.906 0.666 尾浆 6 100～7 600 1.90 22 135 158 336 24.3 915 0.906 0.666 
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表 2 套管扶正器安放设计结果与套管居中度
Table 2 Design result of casing centralizer placement and casing centrality
井段/m 套管扶正器类型 扶正器外径/mm 安放间距/m 扶正器数量/个 套管居中度，% 3 523～5 694 弹性扶正器 190.5 33 66 90～95 5 694～7 060 弹性扶正器 190.5 22 63 65～91 7 060～7 400 弹性扶正器 190.5 44 8 73～90
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表 3 呼探1井ϕ139.7 mm尾管入井过程中的激动压力和井口回压
Table 3 Surge pressure and wellhead back pressure during ϕ139.7 mm liner running in Well Hutan-1
尾管下深/
m工况 钻井液密度/
（kg·L−1）下放速度/
（m·s−1）激动压力/
MPa井口回压/
MPa5000 静止 2.12 0.079 0.273 2.98 下放 2.71 5694 静止 2.12 0.079 0.367 2.98 下放 2.62 6100 静止 2.12 0.079 0.42 2.98 下放 2.56 7000 静止 2.12 0.079 0.538 2.98 下放 2.44 7601 静止 2.12 0.079 0.617 2.98 下放 2.37
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