钻井液可降解携岩剂的研制及在万米深井中的试验

明显森

doi:10.12358/j.issn.1001-5620.2025.03.004

钻井液可降解携岩剂的研制及在万米深井中的试验

doi: 10.12358/j.issn.1001-5620.2025.03.004

明显森^{1, 2,}

1.
油气田应用化学四川省重点实验室, 四川广汉 618300
2.
川庆钻探工程有限公司钻采工程技术研究院, 四川广汉 618300

基金项目: 川庆钻探工程公司科研项目“万米特深井钻井液关键技术研究”（CQ2023B-57-2-3）和“低成本高效可降解携砂剂研发”（CQ2022B-18-4-3）。

详细信息

作者简介:
明显森，工程师，主要从事钻完井液研究工作。电话 13882289179，E-mail：mingxiansen@cnpc.com.cn

中图分类号: TE254.4
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- HTML全文浏览量: 16
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- 被引次数: 0
出版历程
- 收稿日期: 2024-12-28
- 修回日期: 2025-01-23
- 刊出日期: 2025-06-12

Preparation of a Drilling Fluid Degradable Cuttings Carrying Agent and Its Test in 10,000-Meter Deep Wells

MING Xiansen^{1, 2
,}

1.
Sichuan Key Laboratory of Oil / Gas Field Applied Chemistry, Guanghan, Sichuan 618300
2.
CCDC Drilling & Production Engineering Technology Research Institute, Guanghan, Sichuan 618300

摘要

摘要: 在大斜度井、水平井或大尺寸井眼中，因钻井液的携岩能力不足，钻井岩屑容易向下井壁或井底堆积，导致钻具摩阻增大、起下钻困难、井下漏失甚至卡钻等井下复杂情况，因此，井眼清洁是实现在大斜度井、水平井或大尺寸井眼作业安全与效率的关键技术之一。用脂肪族聚酯类聚合物与高分子共聚物共混反应，研制了一种可大幅提升钻井液携岩能力的纤维携岩剂，性能评价实验表明，在加量为0.2%携岩剂的实验浆体中岩屑沉降时间由原来的4.12 s增加至19.85 s；该携岩剂在水相和油相中具有良好的分散性；经120℃热滚16 h后在清水和白油中的降解率分别为95.48%和89.87%，且降解后对钻井液性能不造成影响。现场试验表明，该携岩技术能够大幅提升钻井液的携岩能力，有效携带出大尺寸井眼或水平井段中的岩屑或掉块，提高井眼清洁度，为安全、高效钻井提供保障。
- 钻井液 /
- 携岩剂 /
- 井眼清洁 /
- 可降解
Abstract: In highly deviated wells, horizontal wells or large diameter wells, drilled cuttings are likely to accumulate on the lower side or at the bottom of the well due to insufficient cuttings carrying capacity of the drilling fluid. This will lead to complex downhole situations such as an increase in the friction of the drill string movement, difficulties in tripping, downhole lost circulation and even pipe sticking. Hole cleaning is therefore one of the key technologies to achieve operation safety and efficiency in highly deviated wells, horizontal wells or large diameter wells. A fiber cuttings-carrying agent that can significantly improve the cuttings carrying capacity of a drilling fluid was developed by blending and reacting an aliphatic polyester polymer with a high molecular weight copolymer. Results of performance evaluation experiments show that in the experimental slurry with 0.2% of the cuttings-carrying agent, the settling time of the cuttings increases from the original 4.12 sec to 19.85 sec. This cuttings-carrying agent has good dispersibility in both aqueous phase and oil phase. After hot rolling at 120℃ for 16 h, the degradation rates in clean water and white oil are 95.48% and 89.87% respectively, and the degradation does not affect the performance of the drilling fluid. Field tests show that this cuttings-carrying technology can significantly improve the cuttings-carrying capacity of the drilling fluid, effectively carry drilled cuttings or sloughing rock pieces out of large diameter wells or horizontal well sections, improve the wellbore cleanliness, and provide a guarantee for safe and efficient drilling.
- Drilling fluid /
- Cuttings carrying agent /
- Hole cleaning /
- Degradable

HTML全文

图 1 可降解携岩剂样品及其在扫描电镜下的形态

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图 2 携岩剂在清水（a）和白油（b）中的状态

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图 3 携岩剂在清水中的降解率随　　老化温度和时间的变化关系

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图 4 携岩剂在白油中的降解率随　　老化温度和时间的变化关系

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图 5 SDCK1振动筛返出的岩屑与掉块

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图 6 阳102HX-2井振动筛返出的岩屑与掉块

下载: 全尺寸图片幻灯片

表 1 不同实验浆体的携岩实验评价

浆体编号	实验浆体配方	岩屑沉降时间/s	岩屑沉降速度/(cm/s)
1^#	清水	1.74	13.22
2^#	清水+0.25%XC+0.15%PAC-LV	4.12	5.58
3^#	2^#+0.2%携岩剂	19.85	1.16
4^#	2^#+0.4%携岩剂	24.35	0.94
5^#	2^#+0.6%携岩剂	33.38	0.69
注：①实验用250 mL标准量筒0至250 mL刻度的行程为230 mm；②实验岩屑为PDC钻头实钻川南龙马溪地层（黑色页岩）振动筛返出岩屑，呈薄片状、成型度较好，尺寸为（8～10） mm×（4～6）mm×（1～3） mm；③实验用携岩剂长度为3 mm。

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表 2 不同尺寸纤维携岩剂携岩实验评价

浆体编号	实验浆体配方	岩屑沉降时间/s
6^#	2^#+0.2%携岩剂（3 mm）	19.85
7^#	2^#+0.2%携岩剂（5 mm）	29.11
8^#	2^#+0.2%携岩剂（10 mm）	46.53

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表 3 携岩剂降解后对水基钻井液和油基钻井液性能的影响

钻井液	ρ/g·cm⁻³	AV/mPa·s	PV/mPa·s	YP/Pa	Gel/（Pa/Pa）	FL_API/mL	pH	碱度
聚磺水基钻井液	2.09	48.0	38.0	10.0	2.0/19.0	1.5	10.0
聚磺水基钻井液+0.5%携岩剂	2.09	47.0	37.5	9.5	2.0/20.0	1.6	9.5
白油基钻井液	2.00	47.5	40.0	7.5	1.5/5.0	0.9		572
白油基钻井液+0.5%携岩剂	2.00	46.5	39.5	7.0	2.0/5.0	0.8		465

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表 4 SDCK1井携砂前后钻井液性能

工况	ρ/ g·cm⁻³	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/Pa	FL_API/ mL	pH
携砂前	1.65	47.0	37.0	10.0	2.0/5.0	2.4	8.5
携砂后	1.65	47.5	38.0	9.5	2.0/5.0	2.4	8.5

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