深井超深井短轻尾管短路故障测试方法与现场应用

刘国祥; 赵德利; 李振; 孔博

doi:10.11911/syztjs.2021042

深井超深井短轻尾管短路故障测试方法与现场应用

中国石化石油工程技术研究院，北京 102206

详细信息

作者简介:
刘国祥（1980—），男，山东德州人，2004年毕业于石油大学（华东）石油工程专业，2013年获中国石油大学（北京）石油与天然气工程专业硕士学位，高级工程师，主要从事固井完井工具及工艺技术研究。E-mail：lgx@shelfoil.com

中图分类号: TE256⁺.4
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出版历程
- 收稿日期: 2020-10-24
- 修回日期: 2021-07-12
- 网络出版日期: 2021-04-27
- 刊出日期: 2021-10-17

Short Circuit Fault Test Method and Field Application of Short and Light Liners in Deep and Ultra-Deep Wells

Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China

摘要

摘要: 为了精准测试深井超深井短轻尾管是否发生短路，在尾管短路常规测试方法的基础上，结合实际施工作业条件，提出了变密度浆体循环压力变化曲线测试方法，分析了变密度循环测试原理、控制过程，研究了可操作的测试流程与技术关键点。变密度浆体循环压力对井下循环通道变化具有较高的敏感性，反映在压力曲线上会有不同的压力变化，通过对比现场实测压力曲线与理论压力曲线，可准确判断井下管柱短路情况。现场应用表明，该测试方法具有抗干扰因素强、测试结果精准度高和现场操作简便的优点，能够准确判断尾管管柱是否发生短路。变密度浆体循环压力变化曲线测试方法解决了深井超深井短轻尾管短路测试难的问题，具有较好的现场推广应用价值。
- 尾管 /
- 短路 /
- 迟到时间 /
- 循环压力 /
- 变密度浆体 /
- 线容积
Abstract: To accurately test the short circuit of short and light liners in deep and ultra-deep wells, a test method for the circulating pressure curves of variable density slurry was proposed after analyzing conventional test methods for liner short circuits and considering actual construction conditions. The principle and control processes of variable density cyclic tests, operable test programs, and key technical points were studied. The circulating pressure of variable density slurry was highly sensitive to the changes in downhole circulation channels, shown in pressure curves as variations. The comparison between the measured and theoretical pressure curves can reveal the short circuit situation of downhole strings. Field application results prove the test method has the characteristics of strong anti-interference capability, accurate measurement results, and simple operation, which can correctly identify the short circuit of liner strings. The test method for the circulating pressure curves of variable density slurry has overcome the difficulty in testing the short and light liner short circuits in deep and ultra-deep wells, which is worthy of wide application.
- liner /
- short circuit /
- lag time /
- circulating pressure /
- variable density slurry /
- volume per meter

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图 1 变密度浆体循环压力曲线测试原理

Figure 1. Test principle for the circulating pressure curves of variable density slurry

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图 2 循环压力–时间曲线

Figure 2. Curves of circulating pressure versus time

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表 1 西南地区10#井ϕ177.8 mm尾管循环迟到时间测试结果

Table 1 Test results of the circulation lag time of ϕ177.8 mm liner in Well 10# of Soutuwest Area

序号	实测时间/ min	泵冲	排量/ （L·s⁻¹）	指示物	返出情况	理论返出时间/min
序号	实测时间/ min	泵冲	排量/ （L·s⁻¹）	指示物	返出情况	从井底	从悬挂器
1	176	62	21.0	塑料条	107 min后出现第一片塑料条，109～116 min返出量增多	263	189
2	170	66	22.8	塑料条	153 min出现第一片塑料条，163～170 min返出量增多	242	174
3	120	93	30.0	塑料条、瓷片	120 min时见塑料条	172	123
4	107	93	30.0	瓜子、塑料条	64～77 min发现瓜子，107 min发现瓜子、塑料条；112～127 min返出物数量增多	172	123
5	131	90	29.0	塑料条、云母	109 min见第一片塑料片，121 min时共见22片；127 min见云母片，131 min见大量云母片，之后一直出	174	125
6	138	92	29.7	瓜子、塑料条	138 min见第一片塑料片；153 min时指示物增多，后零星出现瓜子和塑料条	173	125
7	167	93	30.0	密度1.80 kg/L 的重浆16 m³	162～167 min 钻井液密度变化，167～189 min 钻井液密度变化明显	172	123

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表 2 变密度浆体循环测试压力控制表

Table 2 Pressure control table for cyclic tests of variable density slurry

循环井段	替入量/m³	内外静压差/MPa	循环压力/MPa	循环时间/min	变密度浆体循环控制点
钻杆内	0	0	7.50	0	开始进入ϕ139.7 mm钻杆
	8.50	–4.09	11.59	17.7	全部进入ϕ139.7 mm钻杆
	30.28	–4.09	11.59	80.8	开始进入ϕ101.6 mm钻杆
	8.50	–8.34	15.84	98.5	全部进入ϕ101.6 mm钻杆
	4.85	–8.34	15.84	108.6	开始进入ϕ139.7 mm套管
套管底进环空	5.00	–5.84	13.34	119.0	开始进入ϕ139.9 mm套管环空
	1.31	–3.41	10.91	121.8	开始进入环空ϕ193.7 mm套管
	1.65	–0.53	8.03	125.2	开始进入ϕ101.6 mm钻杆环空
	0.54	0.20	7.30	126.3	全部进入ϕ139.9 mm套管
	5.00	4.49	3.01	136.7	全部进入ϕ139.9 mm套管环空
尾管顶部短路进环空	8.50	3.18	4.32	126.3	经ϕ139.9 mm套管顶部全部进入钻套环空

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