非均质砾岩油藏绒囊流体辅助聚合物驱效果

doi:10.7657/XJPG20200308

新疆石油地质 ›› 2020, Vol. 41 ›› Issue (3): 307-313.doi: 10.7657/XJPG20200308

非均质砾岩油藏绒囊流体辅助聚合物驱效果

魏攀峰¹, 郑力会¹, 纪成², 陈启龙³, 黄颖⁴, 樊爱彬⁵

^1. 中国石油大学（北京）石油工程学院,北京 102249
^2. 中国石化西北油田分公司石油工程技术研究院,乌鲁木齐 830000
^3. 中国石化西北油田分公司采油三厂,新疆轮台 841600
^4. 中国石油大港油田分公司天津储气库分公司,天津 300280
^5. 中海油田服务股份有限公司油田生产研究院,天津 300450

收稿日期:2019-07-03 修回日期:2019-12-26 出版日期:2020-06-01 发布日期:2020-06-05
作者简介:魏攀峰（1990-），男，江苏南京人，博士研究生，油气井防漏堵漏，（Tel）13381183201（E-mail）wei.panfeng@163.com
基金资助:
国家科技重大专项(2016ZX05025-003)

Fuzzy-Ball Fluid Assisted Polymer Flooding to Enhance Oil Recovery in Heterogeneous Conglomerate Reservoirs

WEI Panfeng¹, ZHENG Lihui¹, JI Cheng², CHEN Qilong³, HUANG Ying⁴, FAN Aibin⁵

^1. School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
^2. Research Institute of Petroleum Engineering Technology, Northwest Oilfield Company, Sinopec, Urumqi, Xinjiang 830000, China
^3. No.3 Oil Production Plant, Northwest Oilfield Company, Sinopec, Luntai, Xinjiang 841600, China
^4. Tianjin Natural Gas Storage Company, Dagang Oilfield Company, PetroChina, Tianjin 300280, China
^5. Oilfield Production Research Institute, Oilfield Services Co. Ltd., CNOOC, Tianjin 300450, China

Received:2019-07-03 Revised:2019-12-26 Online:2020-06-01 Published:2020-06-05

摘要/Abstract

摘要：

非均质砾岩油藏高渗通道与低渗通道共存时,常规聚合物驱大幅度提高采收率困难。绒囊流体中囊泡在高渗通道低流动阻力诱导下进入并大量堆积,降低高渗通道与低渗通道间流动阻力差,促使驱替介质转向进入低渗区,提高油藏采收率。选择45 mm×45 mm×300 mm渗透率200~1 200 mD人造岩心,模拟多种渗流通道,并联渗透率10~1 200 mD的岩心模拟非均质储集体,驱替压力为0.11~0.57 MPa,水驱和聚合物驱后,高渗与低渗岩心原油采收率差值为16.69%~37.93%,且随渗透率比值的增大而增大。随后注入0.6 PV绒囊流体,低渗岩心原油采收率较高渗岩心高11.15%~19.97%,驱替压力为33.89~39.12 MPa,高渗与低渗岩心内流体流动阻力差反转,驱替介质转向进入低渗岩心,原油采收率提高8.17%~11.54%,提高驱油效果显著。在克拉玛依油田七东₁区砾岩油藏TX井和TY井应用,分别累计注入绒囊流体150 m ³和123 m ³,井口压力升高4.70 MPa和1.28 MPa,对比注入前后90 d,日产油量分别提高64.15%和17.74%,整体含水率下降7.94%和10.91%,说明绒囊流体辅助聚合物驱提高采收率可行。

关键词: 砾岩油藏, 非均质, 渗透率, 聚合物驱, 绒囊流体, 选择性封堵, 提高采收率

Abstract:

When highly permeable pathway coexists with low permeable pathway in heterogeneous conglomerate reservoirs, it is difficult to significantly improve oil recovery by applying conventional polymer flooding. Vesicles in fuzzy-ball fluids can enter and accumulate under the low flow resistance of the highly permeable pathways, then reduces the flow resistance difference between the highly and low permeable pathways, causing displacing medium to go into the low permeable zones and then improving oil recovery. In this paper, an artificial core with the size of 45 mm×45 mm×300 mm and the permeability ranging from 200 mD to 1 200 mD was selected to simulate various flow pathways and cores with the permeability of 10–1 200 mD were connected in parallel to simulate heterogeneous reservoir. With the displacement pressure of 0.11–0.57 MPa, the difference of the oil recovery factor between highly permeable core and low permeable core ranged from 16.69% to 37.93% after waterflooding and polymer flooding, which increased with the rise of the core permeability ratio. Then 0.6 PV fuzzy-ball fluid was injected and the recovery factor of the low permeable core was 11.15%–19.97% higher than that of the highly permeable core with the displacement pressure of 33.89–39.12 MPa, indicating the displacing medium flowing into the low permeable core, and the oil recovery factor could be improved by 8.17%–11.54%. Field tests of fuzzy-ball fluids in TX well and TY well in Block Qidong-1 of Karamay oilfield were carried out and 150 m ³ and 123 m ³ fuzzy-ball fluids were injected into the two wells, respectively, and the wellhead pressures of the two wells were improved by 4.70 MPa and 1.28 MPa, respectively. After 90 days of the injection operation, the daily oil production of the two tested wells increased by 64.15% and 17.74%, respectively, and the overall watercut decreased by 7.94% and 10.91%, respectively, proving that the fuzzy-ball fluid assisted polymer flooding technology was feasible to enhance oil recovery.

Key words: conglomerate reservoir, heterogeneity, permeability, polymer flooding, fuzzy-ball fluid, selective plugging, EOR

中图分类号:

TE357.2

魏攀峰, 郑力会, 纪成, 陈启龙, 黄颖, 樊爱彬. 非均质砾岩油藏绒囊流体辅助聚合物驱效果[J]. 新疆石油地质, 2020, 41(3): 307-313.

WEI Panfeng, ZHENG Lihui, JI Cheng, CHEN Qilong, HUANG Ying, FAN Aibin. Fuzzy-Ball Fluid Assisted Polymer Flooding to Enhance Oil Recovery in Heterogeneous Conglomerate Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(3): 307-313.

图/表 6

图1

表1

图2

图3

图4

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实验编号	渗透率/ mD	水驱		聚合物驱		绒囊流体驱		后续聚合物驱		总采收率/ %
实验编号	渗透率/ mD	采收率/ %	最高驱替压力/MPa	采收率/ %	最高驱替压力/MPa	采收率/ %	最高驱替压力/MPa	采收率/ %	最高驱替压力/MPa	总采收率/ %
1	200	33.14	0.19	30.25	0.51	0.27	39.12	0	12.37	63.66
1	10	10.24	0.19	13.56	0.51	11.42	39.12	2.37	12.37	37.59
2	600	36.57	0.14	32.84	0.45	0.45	36.02	0	11.04	69.86
2	10	8.82	0.14	11.73	0.45	15.17	36.02	3.52	11.04	39.24
3	1 200	42.99	0.11	36.13	0.37	0.61	33.89	0	9.85	79.73
3	10	5.06	0.11	10.49	0.37	20.58	33.89	3.89	9.85	40.02

非均质砾岩油藏绒囊流体辅助聚合物驱效果

Fuzzy-Ball Fluid Assisted Polymer Flooding to Enhance Oil Recovery in Heterogeneous Conglomerate Reservoirs

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