新疆油田玛湖砂岩储层自悬浮支撑剂现场试验

doi:10.13809/j.cnki.cn32-1825/te.2023.04.013

Abstract

Abstract:

Currently, the large-displacement slickwater fracturing process has become the primary method for developing unconventional oil and gas resource. However, the efficiency of this process is limited by the sand carrying capacity of slickwater, which results in rapid settlement and short migration distance of the proppant within the fractures, leading to a need for further improvement in the reservoir transformation effect. To address this issue, a water-soluble material is applied to coat the surface of the self-suspending proppant, enhancing its suspension effect in slickwater or clear water and thereby increasing the crack support volume. The self-suspending proppant meets the required technical standards, showing a total suspension time of less than 40 seconds in tap water at a 20 % sand ratio, and maintaining stable suspension for over two hours at 90 ℃ even during thorough mixing. In a practical on-site test at Mahu sandstone reservoir in Xinjiang Oilfield, continuous sand carrying was achieved using clean water, reaching a maximum sand concentration of 480 kg/m3 while maintaining stable construction pressure. The successful application of self-suspending proppant clear water fracturing technology in Xinjiang oilfield serves as a valuable reference for the selection of oil and gas resource technology in the future stage.

Key words: slickwater, proppant sedimentation, self-suspending proppant, clear water fracturing, field test

CLC Number:

TE355

Hongda REN,Jingfeng DONG,Jing GAO, et al. Field test of self-suspending proppant at Mahu sandstone reservoir in Xinjiang Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 513-518.

Figures/Tables 9

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References 18

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技术指标	检验项目
技术指标	圆度	球度	中间筛/ %	上筛/ %	下筛/ %	破碎率（28 MPa）/ %	视密度/ （g/cm³）	体积密度/（g/cm³）	酸溶解度/ %	浊度/ FTU
标准要求值	≥0.60	≥0.60	≥90.00	≤0.1	≤1.0.00	≤9.00			≤7.00	≤150.00
20/40目石英砂	0.71	0.72	95.00	0	0.20	5.60	2.43	1.53	3.20	51.00
20/40目自悬浮支撑剂	0.75	0.77	99.40	0	0.50	4.90	2.40	1.49	1.90	45.00
40/70目石英砂	0.72	0.73	99.10	0	0.10	5.50	2.46	1.54	2.10	40.00
40/70目自悬浮支撑剂	0.74	0.76	96.50	0	0.30	4.10	2.45	1.47	1.90	44.00

温度/℃	砂比/%	破胶剂加量/%	2 h后黏度/（mPa·s）	5 h后黏度/（mPa·s）	10 h后黏度（mPa·s）
60	20	0.20	12.3	4.1	3.1
	30	0.20	55.6	19.8	4.1
	40	0.20	76.2	36.4	4.2
90	20	0.15	18.3	3.8	3.3
	30	0.15	33.7	8.8	3.4
	40	0.15	55.6	23.8	3.2

项目	平台1		平台2
项目	试验1号井	对比1号井	试验2号井	对比2号井
改造段长/m	1 632	1 451	1 055	1 246
入井砂量/m³	1 295	1 160	956	1 140
支撑剂类型	20/40，40/70自悬浮	20/40，40/70石英砂	20/40，40/70自悬浮	20/40，40/70石英砂
加砂强度/（m³/m）	0.80	0.80	0.91	0.91
液体类型	清水+低黏滑溜水	低黏滑溜水+高黏胶液	清水+低黏滑溜水	低黏滑溜水+高黏胶液
施工排量/（m³/min）	10	10	10	10
最高砂质量浓度/（kg/m³）	480	440	480	420
前置液类型	低黏滑溜水	低黏滑溜水	低黏滑溜水	低黏滑溜水
连续携砂液类型	清水	高黏胶液	清水	高黏胶液
油层钻遇率/%	98.4	96.9	100	95.9
平均孔隙度/%	13.95	13.95	13.95	13.95
平均渗透率/10^-3μm²	6.09	6.09	6.09	6.09
含油饱和度/%	52.8	52.7	61.1	60.4
储层埋深/m	2 521.97	2 500.89	2 460.45	2 453.69
油层平均厚度/m	4.6	4.2	5.5	5.6
闭合应力/MPa	41.0	42.0	37.3	36.5

Field test of self-suspending proppant at Mahu sandstone reservoir in Xinjiang Oilfield

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