高密度油基钻井液降黏剂及其现场应用

明显森; 陶怀志; 陈俊斌; 罗陶涛

doi:10.12358/j.issn.1001-5620.2021.04.004

高密度油基钻井液降黏剂及其现场应用

doi: 10.12358/j.issn.1001-5620.2021.04.004

明显森^{1, 2,},
陶怀志^{1, 2},
陈俊斌^{1, 2},
罗陶涛³

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
3.
重庆科技学院石油与天然气工程学院，重庆 401331

基金项目: 国家科技重大专项“工厂化钻井关键技术研究及应用”（2016ZX05022001）；川庆钻探工程公司科研项目“油基钻井液技术优化研究与应用”（CQ2018B-18-1-3）；重庆市教育委员会科学技术研究项目“基于聚集态网络结构的页岩气水基钻井液携砂稳定机理研究”（KJQN201901538）；重庆市自然科学基金面上项目“页岩气有机/无机杂化弱凝胶水基钻井液流变调控与携砂机理研究”（cstc2020jcyj-msxmX0573）

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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出版历程
- 收稿日期: 2021-02-13
- 网络出版日期: 2023-11-09
- 刊出日期: 2021-07-31

A Viscosity Reducer for Oil Based Drilling Fluids and Its Field Application

MING Xiansen^{1, 2
,},
TAO Huaizhi^{1, 2},
CHEN Junbin^{1, 2},
LUO Taotao³

1.
Sichuan Key Laboratory of Oil / Gas Field Applied Chemistry, Guanghan, Sichuan 618300
2.
CCDC Drilling &Production Engineering Technology Research Institute,Guanghan, Sichuan 618300
3.
Chongqing University of Science & Technology，Chongqing 401331

摘要

摘要: 高密度油基钻井液稠化的主要原因之一是钻井过程中劣质固相的侵入，特别是低密度固相含量的不断增加。劣质固相经过油基钻井液中的润湿剂、乳化剂作用后使其具有了一定的活性，增强体系的网架结构，导致钻井液的黏度和切力上涨。以月桂酰胺、硬脂酸酰胺和芥酸酰胺为原料，按照质量比1∶2∶1合成了分子链中具有可吸附胺基、酰胺基的多元活性基团的降黏剂CQ-OTA。降黏评价实验表明：CQ-OTA能够将固相含量为48.5%高密度稠化油基钻井液的塑性黏度降低25.0%，静切力降低60.0%，其在油基钻井液中的推荐加量为0.5%～1.5%；在威202HX平台现场应用，能够改善油基钻井液的流变性，提高劣质固相容量限，塑性黏度由53.0 mPa·s下降至40.0 mPa·s，10 min静切力由23 Pa下降至14.5 Pa，保证了高密度油基钻井液顺利钻至目的井深，提高了高密度油基钻井液重复使用效率，降低了钻井成本。
- 高密度油基钻井液 /
- 降黏剂 /
- 固相含量 /
- 流变性
Abstract: Invasion of low quality solids, especially the low density solids is one of the major factors causing the thickening of high density oil based drilling fluids. The low quality solids in an oil based drilling fluid, when in contact with the wetting agents and emulsifiers therein, attain a certain degree of activity, thereby strengthening the networking structure and increasing the viscosity and gel strengths of the drilling fluid. A viscosity reducer CQ-OTA with amino groups and amido groups in its molecules was developed with lauramide, octadecanamide and erucamide in a mass ratio of 1∶2∶1. Evaluation on the viscosity reduction capacity of CQ-OTA showed that it can reduce the plastic viscosity and gel strength by 25.0% and 60.0% respectively of a high density thickened oil based drilling fluid containing 48.5% solids. The recommended treatment of CQ-OTA in oil based drilling fluids is 0.5%-1.5%. CQ-OTA was used on the Wei-202HX platform and it effectively improved the rheology of the oil based drilling fluid. The threshold of the low quality solids in the drilling fluid was increased. The plastic viscosity of the oil based drilling fluid was reduced from 53.0 mPa·s to 40.0 mPa·s, the final (10 min) gel strength reduced from 23 Pa to 14.5 Pa, ensuring the successful drilling of the well with the oil based drilling fluid, and enhancing the efficiency of reusing the high density oil based drilling fluid. The drilling cost was thus greatly reduced.
- High density oil-based drilling fluid /
- Viscosity reducer /
- Solid content /
- Rheology

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图 1 降黏剂加量对油基钻井液黏度的影响

下载: 全尺寸图片幻灯片

图 2 降黏剂加量对油基钻井液切力的影响

下载: 全尺寸图片幻灯片

表 1 劣质固相侵入对油基钻井液流变性的影响

岩屑粉/ %	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/Pa	φ₆/φ₃
0	46.5	38.0	8.5	2.5/6.0	6/5
5	47.0	39.0	8.0	2.5/6.0	6/5
10	52.5	43.0	9.5	3.0/7.5	7/6
15	58.5	47.5	11.0	3.5/8.5	7/6
20	69.5	57.0	12.5	4.0/11.5	9/7

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表 2 CQ-OTA对新配浆油基钻井液性能的影响

CQ-OTA/ %	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/ Pa	φ₆/φ₃	ES/ V	FL_HTHP/ mL
0	45.0	37.0	8.0	2.0/6.0	5/4	745	1.6
1.0	48.5	39.0	9.5	2.5/7.0	7/5	816	1.2
注：FL_HTHP在120 ℃测定

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表 3 威202HX-3井油基钻井液的性能随井深的变化

井深	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/Pa
3000	43.5	36	7.5	3.5/12.5
3587	45.0	37	8.0	4.0/14.0
4385	51.5	43	8.5	5.0/16.0
4742	49.5	39	10.5	5.0/18.0
5146	67.0	53	14.0	7.5/23.0

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表 4 威202HX-3井油基钻井液性能

井深/ m	FV/ s	ρ/ g·cm⁻³	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/ Pa	ES/ V	FL_HTHP/ mL	V_s/ %
2906	61	1.98	43.5	36.0	7.5	3.5/12.5	843	1.2	39.5
3587	64	2.02	45.0	37.0	8.0	4.0/14.0	915	1.4	41.0
4385	66	2.02	51.5	43.0	8.5	5.0/16.0	874	1.4	43.0
4742	68	2.05	49.5	39.0	10.5	5.0/18.0	955	2.0	45.0
5146	73	2.03	67.0	53.0	14.0	7.5/23.0	968	2.2	46.0
5217	64	2.02	50.5	40.0	9.5	4.5/14.5	1024	1.6	46.5
注：FL_HTHP在120 ℃测定

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