深层致密砂砾岩气藏双分支水平井有效动用研究
发布时间：2019-05-20 19:44
【摘要】：目前,大庆油田处于“4000万吨稳产”关键时期,“以气补油,天然气快速上产”是油田稳产的最有效途径之一。但砂砾岩264亿储量(1998年开始陆续提交储量),一直因单井产量低、稳产能力差无法动用。沙河子致密砂砾岩资源量在2600亿以上,是第3个1000亿的主要目标区。已勘探10年以上,一直未有突破。制约致密砂砾岩气藏有效开发的难点主要是:一是砂砾岩储层埋藏深、致密低渗透,储层横向变化快,准确找到砂砾岩储层甜点区难度大,气井产量低、稳产能力差,常规水平井压裂动用储量范围有限,尚无有效提高产能的开发方式;二是营四段砂砾岩储层直井和水平井压后增产效果不理想,存在砾块碎落堵塞缝口,压裂施工困难,储层难以得到有效改造的问题。因此为了进一步提高大庆油田深层致密砂砾岩的整体动用程度,扩大此类油气藏的开采程度,改善开发效果,提高产量,降低成本,需要开展适合低渗储层压裂的分支水平井完井增产工艺技术研究。主要的研究思路是首先针对储层特征,通过评价优选有利区块,部署实施分支水平井,形成安全有效、生产周期较长的完井管柱,增加井控储量。其次是根据实际钻遇岩层和完井情况,开展多段分层规模压裂工艺试验。通过研究,形成了“相控”有效储层综合预测技术、钻具优化组合、完井工具重入及密封、完井与压裂配套技术、双分支井体积压裂优化设计方法、钻完井、压裂一体化运行模式等关键技术。实验完成后,形成的分支水平井增产措施可初步满足低渗致密储层有效开发的需要。
[Abstract]:At present, Daqing Oilfield is in the critical period of "stable production of 40 million tons". "replenishing oil with gas and rapid production of natural gas" is one of the most effective ways to stabilize production in Daqing Oilfield. However, the 26.4 billion reserves of sand gravel (which began to be submitted one after another in 1998) have been unable to be used because of the low production of single well and the poor stable production capacity. The resources of Shahezi dense gravel are more than 260 billion, which is the third 100 billion main target area. It has been explored for more than 10 years and there has been no breakthrough. The main difficulties restricting the effective development of tight gravel gas reservoir are as follows: first, the sand gravel reservoir is buried deep, tight and low permeability, the lateral change of reservoir is fast, it is difficult to find the sweet point area of sand gravel reservoir accurately, the gas well production is low, and the stable production ability is poor. The range of fracturing reserves in conventional horizontal wells is limited, and there is no effective development method to improve productivity. Second, the effect of increasing production after straight well and horizontal well pressure in the fourth member of Yingying formation is not ideal, there are some problems, such as gravel fragmentation and blockage of fracture, difficult fracturing construction, and it is difficult to effectively transform the reservoir. Therefore, in order to further improve the overall production degree of deep tight gravel in Daqing Oilfield, expand the exploitation degree of this kind of oil and gas reservoirs, improve the development effect, increase the production and reduce the cost, It is necessary to carry out the research on the production technology of branch horizontal wells suitable for fracturing in low permeability reservoirs. The main research ideas are as follows: first of all, according to the reservoir characteristics, through the evaluation and optimization of favorable blocks, the deployment and implementation of branch horizontal wells, the formation of safe and effective, long production cycle completion string, increase well-controlled reserves. Secondly, according to the actual drilling and completion of rock strata, the multi-stage scale fracturing process test is carried out. Through the research, the effective reservoir comprehensive prediction technology of "phase control", the optimal combination of drilling tools, the reentry and sealing of completion tools, the matching technology of completion and fracturing, the optimal design method of backlogs of double branch wells, and the completion of wells are formed. Key technologies such as fracturing integrated operation mode. After the completion of the experiment, the measures to increase production of branch horizontal wells can initially meet the needs of effective development of low permeability tight reservoirs.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE243;TE37
，
本文编号：2481904
[Abstract]:At present, Daqing Oilfield is in the critical period of "stable production of 40 million tons". "replenishing oil with gas and rapid production of natural gas" is one of the most effective ways to stabilize production in Daqing Oilfield. However, the 26.4 billion reserves of sand gravel (which began to be submitted one after another in 1998) have been unable to be used because of the low production of single well and the poor stable production capacity. The resources of Shahezi dense gravel are more than 260 billion, which is the third 100 billion main target area. It has been explored for more than 10 years and there has been no breakthrough. The main difficulties restricting the effective development of tight gravel gas reservoir are as follows: first, the sand gravel reservoir is buried deep, tight and low permeability, the lateral change of reservoir is fast, it is difficult to find the sweet point area of sand gravel reservoir accurately, the gas well production is low, and the stable production ability is poor. The range of fracturing reserves in conventional horizontal wells is limited, and there is no effective development method to improve productivity. Second, the effect of increasing production after straight well and horizontal well pressure in the fourth member of Yingying formation is not ideal, there are some problems, such as gravel fragmentation and blockage of fracture, difficult fracturing construction, and it is difficult to effectively transform the reservoir. Therefore, in order to further improve the overall production degree of deep tight gravel in Daqing Oilfield, expand the exploitation degree of this kind of oil and gas reservoirs, improve the development effect, increase the production and reduce the cost, It is necessary to carry out the research on the production technology of branch horizontal wells suitable for fracturing in low permeability reservoirs. The main research ideas are as follows: first of all, according to the reservoir characteristics, through the evaluation and optimization of favorable blocks, the deployment and implementation of branch horizontal wells, the formation of safe and effective, long production cycle completion string, increase well-controlled reserves. Secondly, according to the actual drilling and completion of rock strata, the multi-stage scale fracturing process test is carried out. Through the research, the effective reservoir comprehensive prediction technology of "phase control", the optimal combination of drilling tools, the reentry and sealing of completion tools, the matching technology of completion and fracturing, the optimal design method of backlogs of double branch wells, and the completion of wells are formed. Key technologies such as fracturing integrated operation mode. After the completion of the experiment, the measures to increase production of branch horizontal wells can initially meet the needs of effective development of low permeability tight reservoirs.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE243;TE37
，
本文编号：2481904
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