东秋X井高压气层窄密度窗口固井技术

赵凌霄; 王春才; 叶素桃; 邹双; 王健栋; 王彪

doi:10.12358/j.issn.1001-5620.2024.05.014

东秋X井高压气层窄密度窗口固井技术

doi: 10.12358/j.issn.1001-5620.2024.05.014

赵凌霄^{1, 2, 3,},
王春才¹,
叶素桃⁴,
邹双^{1, 2, 3},
王健栋^{1, 2, 3},
王彪^{1, 2, 3}

1.
天津中油渤星工程科技有限公司，天津 300451
2.
CNPC钻井工程重点实验室固井技术研究室，天津 300451
3.
油气钻完井技术国家工程研究中心固井实验室，天津 300451
4.
中石油塔里木油田油气工程研究院,新疆库尔勒 841000

详细信息

作者简介:
赵凌霄，现在主要从事固井技术研究工作。电话 15302067152；E-mail：zhaolx@cnpc.com.cn

中图分类号: TE256.3
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- 被引次数: 0
出版历程
- 收稿日期: 2024-04-18
- 修回日期: 2024-05-21
- 刊出日期: 2024-11-07

Technology for Cementing High Pressure Narrow Density Window Gas Zones in Well Dongqiu-X

ZHAO Lingxiao^{1, 2, 3
,},
WANG Chuncai¹,
YE Sutao⁴,
ZOU Shuang^{1, 2, 3},
WANG Jiandong^{1, 2, 3},
WANG Biao^{1, 2, 3}

1.
CNPC Tianjin Bo-Xing Engineering Science & Technique Limited Company, Tianjin 300451
2.
Key Laboratory of Drilling Engineering, CNPC, Tianjin 300451
3.
National Engineering Research Center of Oil & Gas Drilling and Completion Technique, Tianjin 300451
4.
CNPC Tarim Oilfield Company, Korla，Xinjiang 841000

摘要

摘要: 东秋X井是部署在塔里木盆地库车坳陷秋里塔格构造带上的一口预探井，五开采用Φ215.9 mm钻头、密度为2.17 g/cm³钻井液钻至井深6130 m中途完钻，钻进期间发生多次漏失且裸眼段有多套油气显示，压稳防漏矛盾突出，安全密度窗口仅为0.06 g/cm³，固井过程中极易出现恶性漏失，甚至还会发生由漏转喷等复杂。通过采用精细控压固井技术强化井筒压力控制，使用韧性自愈合水泥浆保障井筒长期完整性，配套带顶封尾管悬挂器辅助密封等技术措施，顺利完成东秋X井固井施工，经 CBL/VDL测井解释固井质量合格率为94.3%，六开降钻井液密度后钻进及完井正常，未见环空带压等异常情况。该技术解决了窄密度窗口高压气井溢漏同存的难题，并可保障封固井段的初次固井质量和长期密封完整性，可为窄窗口高压气井、复杂井的固井技术提供参考。
- 高压气井 /
- 窄密度窗口 /
- 精细控压固井 /
- 韧性自愈合水泥 /
- 带顶封尾管悬挂器
Abstract: The well Dongqiu-X is an exploration well drilled in the Qiulitage tectonic zone of the Kuche sag in the Tarim Basin. The fifth interval of the well was drilled to a depth of 6,130 m with Φ215.9 mm bits and a drilling fluid of 2.17 g/cm³, and was prematurely completed at that depth. During drilling mud losses occurred several times and oil and gas shows in the open hole section were encountered at different depths. Oil/gas kick and mud losses coexist in the same interval, with safe drilling window of only 0.06 g/cm³, meaning that severe losses of cement slurries during well cementing are prone to happen, and the losses of cement slurries may induce well blowout. To deal with this problem, precise pressure control while drilling was adopted to safely control the wellbore pressure, and a tough self-healing cement slurry was used to ensure the long-time integrity of the wellbore. The well Dongqiu-X was successfully cemented using the self-healing cement slurry combined with the use of liner hanger with top packer for auxiliary sealing. CBL/VDL logging results showed that the percent qualified cementing job was 94.3%. When the sixth interval was drilled with a mud of lower density, the drilling operation and the well completion operation were all successfully conducted , and no pressure trap in the annular space was found. The use of the well cementing technology has successfully solved the difficulties encountered in drilling high pressure gas well.
- High pressure gas well /
- Narrow density window /
- Well cementing with precise pressure control /
- Tough self-healing cement /
- Liner hanger with top packer

HTML全文

图 1 常规钻井/固井和精细控压固井密度窗口使用示意图

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图 2 东秋X井在降密度期间不同软件井底ECD模拟

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图 3 东秋X井固井期间漏溢点ECD模拟

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图 4 东秋X井套管和扶正器居中度模拟

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图 5 东秋X井不同固井技术的顶替效率模拟

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表 1 东秋X井不同浆体的流变性能

T/ ℃	浆体名称	φ₆₀₀	φ₃₀₀	φ₂₀₀	φ₁₀₀	φ₆	φ₃	n	K/ Pa·sⁿ
93	钻井液	60	33	22	14	3	2	0.91	0.05
130 ↓93	隔离液	62	36	24	15	5	4	0.92	0.05
130 ↓93	领浆	﹥300	235	163	85	8	5	0.93	0.36
123 ↓93	尾浆	﹥300	253	175	93	9	6	0.93	0.40

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表 2 东秋X井领浆的力学性能

养护条件	编号	实验类型	围压/ MPa	抗拉强度/ MPa	p/ MPa	弹性模量/ GPa
100 ℃ 养护72 h	1	单轴力学性能测试	0		20.6	3.95
	2	三轴力学性能测试	4.5		23.2	2.68
	3	三轴力学性能测试	9.0		21.9	2.09
	4	单轴抗拉强度测试		1.99

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表 3 东秋X井领浆的自愈合性能

裂缝类型	裂缝等效宽度（3 MPa围压）/μm	初期气测渗透率/ mD	终期气测渗透率/ mD	渗透率降低/ %
人工劈开	99.5	40.30	4.800	88.1
微裂缝	22.7	4.56	0.014	99.3

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表 4 不同井段下套管的速度控制

井段/ m	下套管速度	备注
0～1000	≥70 s/根	下尾管
1000～1920	≥110 s/根	下尾管
1920～4510	≥155 s/柱	上层套管内送钻
4510～6120	≥145 s/柱	裸眼段送钻

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表 5 东秋X井固井施工流程表

施工流程	ρ/ g·cm⁻³	注入量/ m³	排量/ L·s⁻¹	立管压力/ MPa	控压值/ MPa
管线试压	2.15			30	控压5
注前置液	2.15	45.0	17～18	14～16	停泵控压5
注领浆	2.18	30.0	17～19	13～17	停泵控压5
注尾浆	2.18	30.0	17～19	13～16	停泵控压5
投塞					控压5
替后置液	2.15	5.0	16～17	13～17	停泵控压5
钻井液	2.12	21.0	18	18～21	停泵控压5
替保护液	2.15	15.0	16～17	13～17	停泵控压5
替重浆、碰压	2.27	27.7	13～18	9～16	停泵控压5

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表 6 东秋X井固井质量评价结果

类型	固井总长度/m	优质段长度/m	良好段长度/m	差段长度/m	优质率/ %	合格率/ %
一界面统计	1937.9	996.9	895.2	45.8	51.4	97.6
二界面统计	1937.9	1187.8	641.1	109.0	61.3	94.4
综合固井统计	1938.0	973.2	854.1	110.7	50.2	94.3

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