成膜封堵技术室内实验研究

Abstract

Abstract:

During the drilling process in complex sections of the formation, due to the leakage of the drilling fluid, the borehole instability occurs easily. In view of this situation, we put forward the film formation and plugging project of the drilling fluid. In the indoor experiment, the microstructure of the mud cake was analyzed by scanning electron microscopy（SEM）. The hydration resistance of the plugging film was evaluated by the water permeation tests. The improved sand bed experiment had simulated the plugging performance of the drilling fluid on the formations with different permeability. Then, we analysed the positive pressure capacity and flowback effect of the plugging film by the self-designed unconsolidated sand core flow experiments. The experimental results showed that the film-formation drilling fluid was resistant to the highest temperature of 150 ℃, and the mud cake formed by API leak-off was denser. In the same period, the water permeability of the mud cake remained unchanged and the plugging film had certain hydration resistance. When the dosage was between 2 % ~ 3 %, the sand beds with different mesh were totally blocked, without the leak-off of the drilling fluid, and the positive pressure value was high after the plugging film formed, which could reach 16 MPa. In the reverse driving, the breakthrough pressure was between 0.5 ~ 1 MPa with good flowback effect.

Key words: leakage, film formation and plugging, plugging film, hydration resistance, leak-off

CLC Number:

TE254

Ruoning Wu,Hanqiao Xiong,Xiaoming Su, et al. Research on indoor experiment of film formation and plugging technology[J]. Reservoir Evaluation and Development, 2018, 8(6): 57-61.

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References 12

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实验配方	表观黏度/ （mPa·s）	塑性黏度/ （mPa·s）	动切力/ Pa	初切力/ Pa	终切力/ Pa	动塑比
0#	45	35	9.7	1.02	1.53	0.28
1#	46	37	9.2	1.53	2.04	0.25
2#	48	38	10.2	1.53	2.04	0.27
3#	49	38	11.2	2.04	2.56	0.29

砂床组成/目	实验配方	压力/MPa	时间/min	渗滤深度/mm	滤失量/mL	加清水后滤失量/mL
20~40	0#	1.2	30	350	全滤失	水滤失
40~60	0#	1.2	30	350	全滤失	水滤失
60~80	0#	1.2	30	350	全滤失	水滤失
80~100	0#	1.2	30	240	68	水滤失

砂床组成/目	实验配方	压力/MPa	时间/min	渗滤度/mm	加清水后滤失量/mL
20~40	1#	1.2	30	78	无滤失
40~60	1#	1.2	30	52	无滤失
60~80	1#	1.2	30	25	无滤失
80~100	1#	1.2	30	14	无滤失
20~40	2#	1.2	30	18	无滤失
40~60	2#	1.2	30	15	无滤失
60~80	2#	1.2	30	12	无滤失
80~100	2#	1.2	30	8	无滤失
20~40	3#	1.2	30	17	无滤失
40~60	3#	1.2	30	14	无滤失
60~80	3#	1.2	30	8	无滤失
80~100	3#	1.2	30	7	无滤失

岩心号	砂床组成/ 目	实验配方	不同压力下30 min的滤失量/mL
岩心号	砂床组成/ 目	实验配方	2 MPa	5 MPa	7 MPa	9 MPa	11 MPa	14 MPa	16 MPa
1-1	80~100	0	线流
2-1	20~40	3#	0.8	0	0	0	0
2-2	40~60	3#	0.5	0	0	0	0
2-3	60~80	3#	0	0	0	0	0
2-4	80~100	3#	0	0	0	0	0
3-1	20~40	2#	1.0	0	0	0	0	0	0
3-2	40~60	2#	0.8	0	0	0	0	0	0
3-3	60~80	2#	0.5	0	0	0	0	0	0
3-4	80~100	2#	0	0	0	0	0	0	0

岩心号	砂床组成/目	实验配方	暂堵时间/min	暂堵压力/MPa	11 MPa压力下滤膜深度/mm
2-1	20~40	2#	30	2.0	2.5
2-2	40~60	2#	30	2.0	1.5
2-3	60~80	2#	30	2.0	0.5
2-4	80~100	2#	30	2.0	0.5

Research on indoor experiment of film formation and plugging technology

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岩心号	砂床组成/目	实验配方	暂堵时间/min	暂堵压力/MPa	返排启动压力/MPa
3-1	20~40	2#	30	2.0	0.10
5-1	40~60	2#	30	2.0	0.05
7-1	60~80	2#	30	2.0	0.05
9-2	80~100	2#	30	2.0	0.05

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