【摘要】：噴砂射孔所用磨料、壓裂液和支撐劑均需通過噴嘴,并以較高的壓力和排量被泵注到地層和裂縫中,導(dǎo)致噴嘴沖蝕嚴重及其內(nèi)部流道變形,這將降低噴嘴的沖蝕切割能力,對壓裂施工的順利進行產(chǎn)生很大的影響。鑒于此,對水力噴射壓裂噴嘴沖蝕程度隨噴射時間變化的規(guī)律進行試驗研究。設(shè)計了試驗方案,分析了噴嘴沖蝕特性,確定了試驗參數(shù),并得到了噴嘴直徑與時間的擬合模型。試驗結(jié)果表明:在排量3 m~3/min、砂比10%的工況下,噴嘴內(nèi)壁的破壞形式以微切削和疲勞損傷為主,噴嘴出口處脆性破壞明顯;噴嘴直徑及噴嘴質(zhì)量與磨蝕時間具有明顯的線性關(guān)系。研究結(jié)果對工具的合理使用和延長工具使用壽命有著重要的指導(dǎo)意義。
[Abstract]:The abrasive, fracturing fluid and proppant used for sandblasting perforation need to pass through the nozzle and pump into the formation and fracture with high pressure and displacement, resulting in the serious erosion of the nozzle and the deformation of the internal runner, which will reduce the erosion cutting ability of the nozzle. It has a great influence on the smooth operation of fracturing. In view of this, the law that the erosion degree of hydraulic jet fracturing nozzle varies with injection time is studied experimentally. The test scheme was designed, the erosion characteristics of the nozzle were analyzed, the test parameters were determined, and the fitting model of nozzle diameter and time was obtained. The results show that the failure of nozzle inner wall is mainly in the form of micro-cutting and fatigue damage under the working condition of 3 ~ 3 / min displacement and 10% sand ratio, and the brittle failure is obvious at the nozzle outlet. The diameter of the nozzle and the mass of the nozzle have obvious linear relationship with the abrasion time. The research results have important guiding significance for the rational use of tools and prolonging the service life of tools.
【作者單位】： 中國石油大學(xué)(北京)油氣資源與探測國家重點實驗室;江蘇博際噴霧系統(tǒng)有限公司;
【基金】：國家自然科學(xué)基金項目“連續(xù)油管調(diào)制局部欠平衡鉆井水力特性研究”(51474232) 江蘇省科技成果轉(zhuǎn)化專項資金資助項目“油氣鉆井用水力脈沖空化射流發(fā)生裝置關(guān)鍵技術(shù)研發(fā)及產(chǎn)業(yè)化”(BA2014131)
【分類號】：TE934.2

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