超低密度水泥固井质量评价方法

吴天乾; 宋文宇; 谭凌方; 张军义; 杨春文; 郭胜来

doi:10.11911/syztjs.2021111

超低密度水泥固井质量评价方法

1.
中石化华北石油工程有限公司技术服务公司, 河南郑州 450006
2.
中国石油大学（华东）石油工程学院, 山东青岛 266580

基金项目: 国家重点基础研究发展计划（“973”计划）项目“深水浅层固井水泥环封隔完整性失效机理与控制”（编号：2015CB251202）部分研究内容

详细信息

作者简介:
吴天乾（1967—），男，河南南阳人，1990年毕业于西南石油学院钻井工程专业，高级工程师，主要从事钻井完井技术研究工作。E-mail：wutq.oshb@sinopec.com

中图分类号: TE26
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出版历程
- 收稿日期: 2021-02-27
- 修回日期: 2021-11-22
- 网络出版日期: 2021-12-26
- 刊出日期: 2022-03-06

Evaluation Method for Cementing Quality of Ultra-Low-Density Cement

1.
Techonology Service Company, Sinopec Huabei Oilfield Service Corporation, Zhengzhou, Henan, 450006, China
2.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, 266580, China

摘要

摘要: 为了准确评价超低密度水泥浆固井质量，采用室内试验方法，研究了养护时间、温度和密度等参数对超低密度水泥石强度和声学特性的影响规律，拟合得到不同密度水泥石抗压强度与纵波、横波声速之间的关系方程；结合套管井井下声场分析结果，构建了基于抗压强度的超低密度水泥测井评价相对声幅改进算法，并建立了基于抗压强度的相对声幅校核图版。验证结果表明，漂珠类超低密度水泥石的相对声幅与抗压强度之间的对应关系较好，随着抗压强度增加，相对声幅减小；在相同抗压强度条件下，相对声幅随着水泥浆密度升高而减小。研究表明，应用超低密度水泥浆固井质量评价相对声幅校核图版，可以显著地提高固井质量评价的准确性和针对性。
- 固井质量 /
- 抗压强度 /
- 声速 /
- 相对声幅 /
- 超低密度水泥
Abstract: For an accurate cementing quality evaluation of ultra-low-density cement slurry, an indoor experiment was carried out to study the influence of parameters such as curing time, temperature, and density on the strength and acoustic properties of ultra-low-density cement stone. The relationship equation between the compressive strength of cement stone with different density and the acoustic velocities of P-waves and S-waves was obtained by mathematical fitting. In combination with the downhole acoustic field analysis of cased wells, an improved algorithm of relative acoustic amplitude was developed for the evaluation of ultra-low-density cement slurry logging based on compressive strength, and a correction type-curve of relative acoustic amplitude was built on that basis. The verification results showed that for the cement slurry of cenospheres, the relative acoustic amplitude corresponded well to compressive strength, and with the increase in compressive strength, the relative acoustic amplitude decreased. Under the same compressive strength, the relative acoustic amplitude was reduced with the growth of cement slurry density. The research demonstrates that the application of the correction type-curve of relative acoustic amplitude for the cementing quality evaluation of ultra-low-density cement slurry can significantly improve the accuracy and pertinence of cemen-ting quality evaluation.
- cementing quality /
- compressive strength /
- acoustic velocity /
- relative sound amplitude /
- ultra-low density cement

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图 1 密度 1.33 kg/L水泥石抗压强度发展曲线

Figure 1. Compressive strength of cement stone with a density of 1.33 kg/L

下载: 全尺寸图片幻灯片

图 2 密度1.33 kg/L水泥石纵横波声速发展曲线

Figure 2. Acoustic velocities of P-waves and S-waves of cement stone with density of 1.33 kg/L

下载: 全尺寸图片幻灯片

图 3 抗压强度与水泥浆密度的关系曲线

Figure 3. Relationship between compressive strength and cement slurry density

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图 4 纵横波声速与水泥浆密度的关系曲线

Figure 4. Relationship between cement slurry density and acoustic velocities of P-waves and S-waves

下载: 全尺寸图片幻灯片

图 5 纵波声速与抗压强度的关系曲线

Figure 5. Relationship between acoustic velocity of P-wave and compressive strength

下载: 全尺寸图片幻灯片

图 6 横波声速与抗压强度的关系曲线

Figure 6. Relationship between acoustic velocity of S-wave and compressive strength

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图 7 基于抗压强度的超低密度水泥固井质量评价相对声幅校正图版

Figure 7. Calibration type-curve of relative acoustic amplitude for cementing quality evaluation of ultra-low-density cement based on compressive strength

下载: 全尺寸图片幻灯片

表 1 声学和强度特性试验用超低密度水泥浆配方

Table 1 Formula of ultra-low-density cement slurry for measurement of acoustic and strength properties

配方	密度/（kg·L⁻¹）	水泥浆各成分含量，%
配方	密度/（kg·L⁻¹）	G级水泥	漂珠1	漂珠2	微珠3	微硅	水	早强剂	降滤失剂	减阻剂
1	1.10	100	30	0	34	30	250	4.50	5.00	0.30
2	1.15	100	30	0	30	30	245	4.00	4.50	0.30
3	1.20	100	27	25	0	20	180	4.00	4.00	0.30
4	1.25	100	25	22	0	20	140	4.00	3.50	0.25
5	1.33	100	36	0	0	10	120	3.30	1.40	0.20
6	1.50	100	15	0	0	5	70	4.00	4.00	0.30
7	1.90	100	0	0	0	0	44	0	0.50	0.10

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表 2 纵横波声速与抗压强度的拟合关系式

Table 2 Fitting relationship between compressive strength and acoustic velocity of P-waves and S-waves

序号	密度/（kg·L^–1）	声波速度与抗压强度关系式	相关系数
1	1.10	$p = 0.002{{\rm{e}}^{0.003\;9{v_{\rm{p}}} } }$	R²=0.989 5
1	1.10	$p = 0.001\;9{{\rm{e}}^{0.003\;4{v_{\rm{s}}} } }$	R²=0.964 9
2	1.15	$p = 0.005\;5{{\rm{e}}^{0.003\;4{v_{\rm{p}}} } }$	R²=0.941 7
2	1.15	$p = 0.014\;5{{\rm{e}}^{0.005\;5{v_{\rm{s}}} } }$	R²=0.937 0
3	1.20	$p = 0.001\;9{{\rm{e}}^{0.003\;5{v_{\rm{p}}} } }$	R²=0.891 2
3	1.20	$p = 0.021{{\rm{e}}^{0.004\;5{v_{\rm{s}}}}}$	R²=0.860 7
4	1.25	$p = 0.061\;8{{\rm{e}}^{0.002\;1{v_{\rm{p}}} } }$	R²=0.920 6
4	1.25	$p = 0.035\;6{{\rm{e}}^{0.004\;1{v_{\rm{s}}} } }$	R²=0.955 4
5	1.33	$p = 0.003\;5{{\rm{e}}^{0.003\;4{v_{\rm{p}}} } }$	R²=0.900 6
5	1.33	$p = 0.001\;7{{\rm{e}}^{0.006\;7{v_{\rm{s}}} } }$	R²=0.911 3

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