现场油基钻井液固相粒度评价新方法

李兵

doi:10.12358/j.issn.1001-5620.2022.02.010

现场油基钻井液固相粒度评价新方法

doi: 10.12358/j.issn.1001-5620.2022.02.010

李兵

胜利石油工程公司西南分公司, 成都 257500

基金项目: 国家科技重大专项专题“新型低伤害强防塌钻井液体系研究”（2016ZX05044003-003）

详细信息

作者简介:
李兵，硕士，毕业于长江大学油气井工程专业，现主要从事石油工程方面钻井技术、井下作业技术等工作。电话 17710592902；E-mail：wupuo0@163.com

中图分类号: TE254.3
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出版历程
- 收稿日期: 2021-10-08
- 修回日期: 2021-12-25
- 刊出日期: 2022-06-23

A New Method for On-site PSD Evaluation of Oil Based Mud

LI Bing

Sinopec Shengli Petroleum Engineering Co., Ltd. Southwest Branch，Chengdu，Sichuan 257500

摘要

摘要: 固相颗粒分布对油基钻井液的性能影响较大，因此确定现场钻井液固相颗粒尺寸，对于调控钻井液性能具有重要意义。根据现场油基钻井液经固控设备分离前后的粒度分布数据，建立了固控设备清除效率与固相颗粒粒径分布关系。现场通过钻井液固相含量测定，可知现场固控设备的固控效率，进一步可确定现场钻井液固相颗粒粒径的分布范围。现场井浆固相含量测定表明，固控设备清除效率与固相颗粒粒径分布具有强相关性，相关系数R²可达0.97；经固控设备分离后，现场油基钻井液的固相含量由45.0%降至16.2%，清除效率达0.64。采用上述测试方法测得的固相粒径为12.50 μm，在使用激光粒度分布仪得的粒径峰（7.11～12.73 μm）范围内，表明该测试方法具有良好的准确性，可用于现场测量钻井液内的固相粒度。
- 油基钻井液 /
- 固相含量 /
- 固控设备 /
- 粒度测量
Abstract: Particle size distribution (PSD) has major effects on the properties of oil based drilling fluids in field operations, and the on-site determination of the solids particle sizes is therefore important to the controlling and maintenance of the drilling fluid properties. Using the PSD date of field oil based drilling fluids prior to and after passing through solids control equipment, a relationship between the solids removal efficiency of the solids control equipment and the PSD of the drilling fluids was established. The solids removal efficiency of the field solids control equipment can be obtained by measuring the solids content of a drilling fluid, and the range of the solids particle sizes can then be also determined. Field tests of different drilling fluids have shown that there is a strong correlation between the solids removal efficiency of a solids control equipment and the solids PSD, the coefficient of correlation R² being 0.97. A field oil based drilling fluid, after passing through a set of solids control equipment, had its solids content reduced from 45.0% to 16.2%, the efficiency of solids removal was therefore 36.0%. Using the aforementioned test method, the particle size of the solids was 12.50 μm, falling in the range of particle size peaks (7.11 – 12.73 μm) obtained with laser particle size tester. These data indicate that the proposed test method has good accuracy, making it feasible to be used in measuring the solids sizes of field drilling fluids.
- Oil based drilling fluid /
- Solids content /
- Solids control equipment /
- Particle size measurement

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图 1 分离效率拟合曲线

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表 1 钻井液固相含量占比

分离前		分离后		固相清除效率/%
粒径/ μm	固相含量/ %	粒径/ μm	固相含量/ %	固相清除效率/%
1.83	0	1.83	0.07	0
2.22	0.06	2.22	0.09	46.0
2.70	0.06	2.70	0.11	34.0
3.28	0.66	3.28	1.04	56.73
3.98	1.50	3.98	2.36	43.36
4.83	2.54	4.83	3.98	43.59
5.86	5.59	5.86	8.49	45.32
7.11	10.95	7.11	15.78	48.12
8.64	14.50	8.64	19.48	51.64
10.48	14.39	10.48	17.29	56.74
12.73	10.89	12.73	10.73	64.53
15.45	8.20	15.45	6.73	70.45
18.75	6.43	18.75	4.52	74.69
22.76	5.01	22.76	3.14	77.44
27.63	4.24	27.63	2.31	80.39
33.54	3.44	33.54	1.54	83.88
40.72	2.93	40.72	1.08	86.73
49.43	2.46	49.43	0.73	80.88
60.00	2.02	60.00	0.41	92.69
72.84	1.68	72.84	0.17	96.36
88.42	1.32	88.42	0	100.00
107.33	0.80	107.33	0	100.00
130.29	0.33	130.29	0	100.00
158.17	0	158.17	0	100.00
注：分离前固相含量为45%,分离后固相含量为16.2%

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表 2 拟合曲线方程数据

方程	${{G} }\left( D \right) = {B_1}{D^3} + {B_2}{D^2} + {B_3}D + {\text{I} }$
I	0.307 08 ± 0.026 37
B₁	0.030 49 ± 0.002 77
B₂	−5.174 05×10⁻⁴±7.258 75×10⁻⁵
B₃	2.975 6×10⁻⁶±5.259 09×10⁻⁷
R²	0.984 55

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