玛湖砂砾岩致密油藏水平井CO2吞吐现场试验效果分析

doi:10.13809/j.cnki.cn32-1825/te.2021.06.011

摘要/Abstract

摘要：

新疆玛湖砂砾岩致密油藏孔隙度和渗透率极低,压裂投产后前期稳产效果较好,后期递减较大,为补充地层能量提高原油采收率,先后在玛131井区开展3口水平井CO₂吞吐试验。试验结果表明：CO₂吞吐提高原油采收率机理主要体现在增加储层能量、膨胀原油体积、降低原油黏度、萃取轻质组分、溶蚀储层矿物、增加流体流动能力等方面。合理的注入参数更有助于提高原油采收率,在进行CO₂吞吐开发时井底注入流压越高,焖井时间越长,波及扩散越充分,连续见油时间越早,提高采收率越明显。3口水平井X721、X92、M1114增油量分别为2 161 t,1 768 t,1 452 t,CO₂吞吐在砂砾岩致密油藏中具有较好的适应性及推广应用前景。

关键词: 砂砾岩, 致密油藏, 提高采收率, CO₂吞吐, 现场试验

Abstract:

The porosity and permeability of Mahu sandy conglomerate tight reservoir in Xinjiang are extremely low. After fracturing and putting into production, the stable production effect of early development is good, and the decline is large in the later stage. In order to supply the formation energy and improve the crude oil recovery, the tests of CO₂ huff and puff for three horizontal wells have been carried out in Ma131 well area. The test results show that the mechanism of CO₂ huff and puff to improve crude oil recovery is mainly reflected in increasing reservoir energy, expanding crude oil volume, reducing crude oil viscosity, extracting light components, dissolving reservoir minerals and increasing fluid flow capacity. Reasonable injection parameters are more helpful to enhanced oil recovery. During the development of CO₂ huff and puff, the higher bottomhole injection pressure and the longer soaking time, as well as greater sweep diffusion, result in earlier continuous oil production and more obvious enhanced oil recovery effect. The oil increment of three horizontal wells, Well-X721, Well-X92 and Well-M1114, is 2 161 t, 1 768 t and 1 452 t, respectively. CO₂ huff and puff has good adaptability and popularization and application prospect in sandy conglomerate tight reservoir.

Key words: sandy conglomerate, tight reservoir, enhanced oil recovery, CO₂ huff and puff, field test

中图分类号:

TE357

施雷庭,张玉龙,叶仲斌等. 玛湖砂砾岩致密油藏水平井CO₂吞吐现场试验效果分析[J]. 油气藏评价与开发, 2021, 11(6): 871-877.

Leiting SHI,Yulong ZHANG,Zhongbin YE, et al. Field test effect analysis of CO₂ huff and puff for EOR of horizontal wells in tight glutenite reservoir of Mahu Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(6): 871-877.

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井号	注入速度（t/d）	注入压力（MPa）	注入时间（d）	注入量（t）	焖井时间（d）	增油量（t）	换油率	措施后初期见油
X721	87.56	6~11.3	23	2 014	32	2 161	1.07	47 h后开始见油
X92	72~144	3.5~5.4	56	4 001	38	1 768	0.44	14 d后连续出油
M1114	72~120	8~10	44	4 347	79	1 452	0.33	18 h后连续见油

测压时间	注入量（t）	测压备注	油层中部（2 463.49 m）
测压时间	注入量（t）	测压备注	压力（MPa）	温度（^oC）
8月7日	958	液态注入停3 d	17.87	68.11
8月22日	1 530	气态注入72 t/d	19.14	60.41
10月16日	4 001	焖井29 d	18.17	60.25
10月17日	4 001	焖井30 d	18.16	59.86
10月26日	4 001	焖井39 d	17.32	56.74

取样日期	pH值	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	Ca²⁺	Mg²⁺	Na⁺
20181003	7.00	160.44	3 099.72	2 834.23	384.24	147.49	24.31	3 098.90
20200426	7.97	0	523.75	3 095.93	7.38	222.35	8.05	1 939.00
20200514	7.40	0	6 303.84	6 711.23	47.12	323.85	43.98	6 297.63
20200604	7.36	0	2 970.82	6 401.59	37.02	211.05	6.02	5 036.90

井号	取样日期	密度（g/cm³）	黏度（mPa·s）
M1114	20200324	0.809 8	7.66
	20200408	0.815 8	7.85
	20200420	0.815 0	7.52
	20180411	0.847 4	26.52
M1148	20200406	0.831 6	12.48
M1149	20200406	0.848 7	27.43

玛湖砂砾岩致密油藏水平井CO₂吞吐现场试验效果分析

Field test effect analysis of CO₂ huff and puff for EOR of horizontal wells in tight glutenite reservoir of Mahu Oilfield

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