低渗透油气田“层内爆炸”增产技术研究

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回顾爆炸法(井内爆炸法、核爆炸法和高能气体压裂)增产油气的历史,提出低渗透油气田“层内爆炸”增产技术的基本思路:利用水力压裂技术将乳胶状爆燃药压入油层裂缝,并采取不损毁井筒的技术措施点燃该爆燃药,从而在水力压裂主裂缝邻域造成碎裂带,达到提高采收率、增产原油的目的。至少已找到一组特种火炸药基本配方,在200mm小尺度模拟实验中实现了“层内爆炸”挤注、点火和爆燃的过程,证实技术原理基本可行。考虑流体内部的热传导、边界的热损失和阻尼,提出了有化学反应的薄层药爆燃一维可压缩流体力学模型,并对此模型进行恒稳推进和不可压缩简化,计算结果的物理图象符合常理,从理论上证实了薄层药爆燃可行。“层内爆炸”油井产出液的后处理,原则上是安全的:残留在岩缝的未爆炸炸药颗粒在生产阶段难以流出地层;进入集输系统的残药颗粒浓度低于1%,原则上能用离心法分离;残留在分离后原油中的的微量炸药在400℃加热炉已完全热分解,热分解不可能导致爆炸。“层内爆炸”增产技术的研究是具有战略性、前瞻性的科技创新课题,预期增产效益显著高于水力压裂,有可能形成低渗透油气田开采的新局面,还可能使一些目前不可采的低渗透油气资源成为可采资源。今后工作主要有四方面:室? Reviewing the history of oil and gas production by explosion method (in-well blasting method, nuclear explosion method and high-energy gas fracturing), and putting forward the basic idea of ​​“in-layer explosion” stimulation technology in low-permeability oil and gas fields: the use of hydraulic fracturing technology to push latex- Cracks, and take the technical measures to not damage the wellbore ignition of the explosive, fracturing zone in the vicinity of the main fractures of hydraulic fracturing to achieve the purpose of increasing oil recovery and oil production. At least one set of basic formula of special explosives has been found. The process of squeezing, igniting and detonating “in-layer explosion” has been realized in the 200mm small-scale simulation experiment, which proves that the principle of technology is basically feasible. Considering the heat conduction inside the fluid and the heat loss and damping of the boundary, a one-dimensional compressible fluid mechanics model of deflagration of thin-walled drug with chemical reaction was proposed. The model was steadily advanced and incompressible, and the calculated physical image In line with common sense, theoretically confirmed that the deflagration of thin layer of drugs feasible. The reprocessing of the “in-layer explosion” oil well fluids is in principle safe: the unexploded explosive particles remaining in the rock seam are hard to flow out of the formation during the production phase; the concentration of remnant particles entering the gathering system is below 1% Can be separated by centrifugation; traces of residual explosives in the crude oil after separation at 400 ℃ furnace has been completely thermal decomposition, thermal decomposition can not lead to an explosion. The study of “in-layer explosion” stimulation technology is a strategic and forward-looking scientific and technological innovation project. It is expected that the stimulation yield will be significantly higher than that of hydraulic fracturing, which may lead to a new situation in the exploitation of low-permeability oil and gas fields. It may also result in some irreplaceable Low-permeability oil and gas resources have become recoverable resources. There are four main aspects of work in the future: room?
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