超分子聚合物堵漏技术在长庆油田恶性漏失井的应用

艾磊; 宫臣兴; 谢江锋; 蒋官澄; 崔凯潇; 邓正强

doi:10.12358/j.issn.1001-5620.2021.06.007

超分子聚合物堵漏技术在长庆油田恶性漏失井的应用

doi: 10.12358/j.issn.1001-5620.2021.06.007

1.
中国石油长庆油田分公司油气工艺研究院, 中国石油长庆油田分公司低渗透油气田勘探开发国家工程实验室, 西安 710018
2.
油气资源与探测国家重点实验室, 石油工程教育部重点实验室, 中国石油大学（北京）, 北京 102249

基金项目: 国家科技重大专项鄂尔多斯盆地致密油开发示范工程“ 致密油水平井钻完井技术研究与应用”（2017ZX05069004）。

详细信息

作者简介:
艾磊，工程师，1986年生，毕业于西南石油大学石油工程专业，现在从事钻井工艺研究工作。E-mail：al1_cq@petrochina.com.cn；电话17791259280

中图分类号: TE282
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出版历程
- 收稿日期: 2021-07-08
- 刊出日期: 2021-11-30

Application of Supramolecular Polymer Plugging Technology in Changqing Oilfield

1.
Research Institute of Oil & Gas Technology, PetroChina Changqing Oilfield Company, National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, Shaanxi, 710018, China
2.
State Key Laboratory of Petroleum Resources and Prospecting, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

摘要

摘要: 长7页岩油储层致密但流体流动性好，砂岩储层存在微米级孔隙，加上存在断层构造，导致钻进过程中渗透性漏失、裂缝性漏失甚至失返性漏失频发，常规堵漏材料无法满足钻井施工要求，造成非生产时间和成本大幅度增加，严重制约了勘探开发进程。借助超分子化学理论，通过合成优化配方，研发出了新型超分子聚合物防漏堵漏材料，并对其微观结构、剪切稀释性和恶性漏失承压堵漏能力进行了表征与测试。研究结果表明，超分子聚合物堵漏材料不仅具有优异的剪切稀释性和黏附能力，而且对两层钢珠床（钢珠直径8～10 mm）模拟的大孔隙性漏失和直缝板（缝宽2～6 mm）模拟的裂缝性漏失均具有较强的承压堵漏效果，承压达6 MPa。在长7页岩油区块典型恶性漏失井应用表明，超分子聚合物堵漏技术可以有效提高裂缝性漏层的承压能力，减少漏失量并降低综合堵漏成本，助力长7页岩油勘探开发，值得进一步研究和推广。
- 井漏 /
- 裂缝性漏失 /
- 超分子聚合物 /
- 长7页岩油
Abstract: The Chang 7 shale oil reservoir is tight but has good fluid fluidity, which has micron-scale pores and fracture structure, leading to frequent permeable loss, fractured loss and total loss during the drilling process. Conventional plugging materials cannot meet the drilling construction requirements, resulting in a significant increase in non-production time and costs, and severely restricting the exploration and development process. Based on the theory of supramolecular chemistry, this research developed a new type of supramolecular polymer plugging material through synthesis formula optimization, and characterized and tested its microstructure, shear thinning and loss mitigation and pressure-bearing plugging ability. The research results show that the supramolecular gel plugging material not only has excellent shear thinning properties and adherence abilities, but also has a strong pressure-bearing plugging effect in large pore loss zones simulated by two-layer steel ball beds (the steel ball diameters are 8 mm ～ 10 mm) and fractured loss zones simulated by longitudinal slotted plate (the fracture widths are 2 mm～6 mm), with a pressure-bearing capacity up to 6MPa. Its application of typical total loss well in Chang 7 shale oil block shows that supramolecular gel plugging technology can effectively improve the pressure-bearing capacity of fractured loss zones reducing loss volume and comprehensive plugging costs, and helps Chang 7 shale oil exploration and development. Thus, it is worthy of further research and promotion.
- Lost circulation /
- Fractured loss /
- Supramolecular polymer /
- Chang 7 shale oil

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图 1 71型高温高压堵漏仪物理模型

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图 2 超分子聚合物红外表征图谱

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图 3 超分子聚合物堵漏剂扫描电镜图像

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图 4 25%超分子聚合物堵漏剂溶液黏度随剪切速率变化曲线

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图 5 超分子聚合物堵漏剂的黏附能力测试结果

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图 6 不同浓度超分子聚合物堵漏剂形成的砂床状态

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图 7 超分子聚合物堵漏剂对不同尺寸两层钢珠床的承压能力评价

注：1 psi=6.9 kPa

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图 8 超分子聚合物堵漏剂黏结后的9 mm两层钢珠床

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图 9 超分子聚合物堵漏剂对不同尺寸缝板的承压能力评价

注：1 psi=6.9 kPa

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图 10 超分子聚合物堵漏剂封堵后3 mm缝板

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图 11 华H50-7井地震反演剖面

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图 12 华X井钻井期间平均漏速变化情况

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图 13 超分子聚合物挤封压力曲线

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表 1 超分子聚合物合成方案设计

序号	AM∶WS-1	t/h	引发剂/%	SDS/%	T/℃
1	99∶1	2	0.2	1	40
2	99∶5	3	0.3	2	50
3	90∶10	4	0.4	3	60
4	88∶12	5	0.5	4	70
5	99∶5	3	0.3	2	50
6	99∶5	4	0.2	1	40
7	99∶5	5	0.5	4	70
8	99∶5	2	0.4	3	60
9	90∶10	4	0.5	3	60
10	90∶10	2	0.2	4	70
11	90∶10	5	0.4	1	40
12	90∶10	3	0.3	2	50
13	88∶12	5	0.4	4	70
14	88∶12	4	0.5	3	40
15	88∶12	2	0.3	2	50
16	88∶12	3	0.2	1	60

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表 2 不同配方条件下0.2%～0.5%超分子聚合物溶液剪切稀释测试结果

序号	超分子聚合物/ %	高剪切速率下的黏度/ mPa·s	低剪切速率下的黏度/ mPa·s
1	0.5	78	8120
2	0.5	55	12510
3	0.5	46	78080
4	0.5	89	42015
5	0.3	68	7954
6	0.2	45	15420
7	0.5	50	100871
8	0.5	87	45792
9	0.5	68	10541
10	0.5	62	51234
11	0.5	49	112540
12	0.5	95	41258
13	0.5	88	9974
14	0.5	51	77589
15	0.5	42	78564
16	0.5	91	22543

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表 3 不同浓度超分子聚合物堵漏剂漏失量随压力的变化

P/ MPa	不同超分子聚合物浓度（%）下的漏失量/mL
P/ MPa	10	15	20
0	0	0	0
1	63	48	0
2	全漏失	全漏失	0
3			0
4			1
5			24
6			全漏失

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