碳酸盐岩水平井酸化模式及工艺参数优化研究

Abstract

Abstract:

The horizontal well has the charecteristics of large span and strong heterogeneity, the damage caused by drilling, completion and exploitation is characterized by strong heterogeneity, and the efficiency of the general acidizing is low. Considering the existing technical bottleneck, we proposed a design of the efficient acidizing in heterogeneous carbonate reservoirs based on the description of damage characteristics, the optimization of acidizing modes, and the injection parameters, meanwhile, built a set of 3D fine mathematical models for the simulation of the damage of the horizontal wells, the optimization of acidizing modes and parameters, and the evaluation after acidizing. Based on the method above and the mathematical models, we carried out the systemic simulation of a horizontal well. The results show that the damage degree of the horizontal well is extremely uneven in the 3D space. In accordance with the general acidification, multistage acidification and partial acidification respectively, then we carried out the simulation analysis by using the diverting acid system with the strength of 0.5 m ³/m. The partial acidification was better than the other two modes and its comprehensive skin coefficient decreased from 4.717 to -0.083. The optimum design of the process parameters was also carried out in the fourth part of the partial acidification. The optimal acid injection rate was 2 m ³/min and the optimal acid volume was 66 m ³. The results can solve the problem of the unsatisfactory matrix acidizing effect of the long section of the horizontal wells in carbonate reservoirs, and optimize the controllable parameters（such as treatment parameters） and uncontrollable parameters（such as formation parameters）, in order to achieve the reasonable and high efficiency acidification.

Key words: acid wormhole, acidizing of horizontal well, carbonate rock, heterogeneity, 3D simulation, numerical model

CLC Number:

TE357

Heng Xue,Zuxi Huang,Liqiang Zhao, et al. Optimization study on horizontal well acidizing modes and injection parameters in carbonate reservoir[J]. Reservoir Evaluation and Development, 2018, 8(3): 66-72.

Figures/Tables 10

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References 19

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段号	水平井段位置/m	段长/ m	局部综合表皮系数,f	酸液用量/ m³
第一段	0~498	498	1.296	50
第二段	498~1 250	752	5.405	600

段号	水平井段位置/m	段长/ m	全井综合表皮系数,f	酸液用量/ m³
第一段	24~343	319	1.467	50
第二段	488~759	271	6.610	270
第三段	778~913	135	5.248	120
第四段	952~1 184	232	4.808	210

Optimization study on horizontal well acidizing modes and injection parameters in carbonate reservoir

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