沈北潜山全过程欠平衡钻井工艺技术研究

发布时间：2018-06-24 15:48

本文选题：欠平衡 + 低密度泥浆　；参考：《东北石油大学》2015年硕士论文

【摘要】：沈北潜山地区,作为辽河油田开采多年的老区块,地层结构复杂。随着不断地开发,油藏压力逐年降低,在油藏保护、优快安全钻井方面对现场施工带来了更大的困难。常规欠平衡钻井在沈北潜山地区已经得到初步的推广应用,常规欠平衡钻井在起下钻过程中无法避免泥浆对油气层污染,导致储层伤害依然严重。为达到最大程度的保护油气藏不受泥浆污染的目的,本文分析了沈北潜山地区地质特征,针对其结合其低压、低渗、保护油气藏的特点以及老区挖潜的需要,提出了采用全过程欠平衡钻井技术解决储层伤害问题。针对全过程欠平衡钻井工艺的国内外调研情况和实际应用,对比强行起下钻工艺和冻胶阀技术优缺点,结合沈北潜山伴生气地质特征,优选套管阀技术实现全过程欠平衡钻井。研制了全过程欠平衡关键工具套管阀,从主体设计到关键密封件设计,结合室内性能试验,使工具满足钻井作业需要。研制低密度钻井液体系,分别对甲酸盐无固相钻井液体系、水包油钻井液体系和空心玻璃微珠复合钻井液体系进行配方和性能试验,结合现场实际需要,针对性的优选了水泥浆体系。将研制的套管阀配合低密度钻井液体系在沈北潜山地区进行现场试验,验证了全过程欠平衡技术在沈北地区的可行性。本文通过套管阀和低密度钻井液体系,合理的解决沈北潜山全过程钻井难题,为老区找油挖潜提速提供了一条新途径。
[Abstract]:Shen Bei buried hill area, as an old block in Liaohe Oilfield, has complicated stratigraphic structure. With the continuous development, the reservoir pressure decreases year by year, which brings more difficulties to field operation in reservoir protection and safe drilling. Conventional underbalanced drilling has been applied in Shenbei buried hill area. During the process of conventional underbalanced drilling mud pollution to oil and gas reservoir can not be avoided and the reservoir damage is still serious. In order to protect oil and gas reservoirs from mud pollution to the greatest extent, this paper analyzes the geological characteristics of the buried hill area in Shenbei, aiming at its characteristics of low pressure, low permeability, protection of oil and gas reservoirs and the need of tapping potential in the old area. The whole process underbalanced drilling technology is proposed to solve the reservoir damage problem. In view of the domestic and international investigation and practical application of the whole process underbalanced drilling technology, this paper compares the advantages and disadvantages of forced down drilling technology and gel valve technology, and combines with the geological characteristics of associated gas in Shenbei buried hill, realizes the whole process underbalanced drilling with the optimized casing selection valve technology. The whole process underbalance key tool casing valve has been developed, from the main body design to the key seal design, combined with the indoor performance test, the tool can meet the drilling operation needs. A low density drilling fluid system was developed. The formulation and performance of formate solid free drilling fluid system, water in oil drilling fluid system and hollow glass microbead composite drilling fluid system were tested. The cement slurry system is selected. The field test of casing valve and low density drilling fluid system in Shenbei buried hill area verified the feasibility of the whole process underbalance technology in Shenbei area. Through casing valve and low density drilling fluid system, this paper reasonably solves the problem of drilling in the whole process of Shen Bei buried hill, and provides a new way for searching for oil and raising the speed of oil potential in the old area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE249

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