【摘要】：通過對(duì)油基水泥漿的組成、堵水機(jī)理以及流動(dòng)規(guī)律的研究分析,建立了在柴油基前置液保護(hù)下油基水泥漿在碳酸鹽巖裂縫中流動(dòng)的數(shù)學(xué)模型,使用數(shù)學(xué)模型對(duì)最大流動(dòng)深度與粘度、縫寬、壓差以及注漿速度等因素的關(guān)系進(jìn)行描述。通過室內(nèi)研究對(duì)油基水泥漿體系的組成進(jìn)行優(yōu)化,同時(shí)考慮漿體沉降穩(wěn)定性與流動(dòng)性,得到置換效率為77.76%、表觀粘度為1550mPa·s的普通油基水泥漿體系以及置換效率為51.29%、表觀粘度為456mPa·s的油基超細(xì)水泥漿體系。通過在普通油基水泥漿中加入丙三醇提高漿體的水化深度,以便提高堵劑的利用率,實(shí)驗(yàn)證明加入水泥質(zhì)量0.2%的丙三醇,可以將水化深度提高50%,并且對(duì)粘度與置換效率影響較小。對(duì)油基水泥漿在裂縫中的流動(dòng)規(guī)律進(jìn)行了室內(nèi)物模實(shí)驗(yàn),實(shí)驗(yàn)方案使用天然大理石板模擬碳酸鹽巖裂縫,向模擬裂縫中泵入油基水泥漿來模擬漿體在裂縫中的流動(dòng)情況,通過對(duì)物理模型中水泥漿流動(dòng)規(guī)律的研究,結(jié)合數(shù)學(xué)模型,得到以下結(jié)果:遇水前,油基水泥漿在裂縫中的流動(dòng)阻力并不高,而對(duì)比普通油基水泥漿,油基超細(xì)水泥漿在裂縫中的流動(dòng)情況更好,流動(dòng)阻力更低;遇水后,漿體在裂縫中的流動(dòng)阻力迅速增大,在遇水初期,油基超細(xì)水泥漿的流動(dòng)阻力依舊要低于普通油基水泥漿,但是,由于超細(xì)水泥水化速度比普通水泥更快,油基超細(xì)水泥漿流動(dòng)阻力上更加迅速,常溫下,在大約15min時(shí),其流動(dòng)阻力超過普通油基水泥漿。
[Abstract]:A mathematical model of oil-based cement slurry flowing in carbonate fractures under the protection of diesel-based preliquid is established by studying the composition of oil-base cement slurry, water shutoff mechanism and flow law. The relationship between maximum flow depth and viscosity, crack width, pressure difference and grouting speed is described by mathematical model. The composition of oil-base cement slurry system is optimized through laboratory study, and the stability and fluidity of slurry settlement are considered. The displacement efficiency is 77.76, the apparent viscosity is 1550mPa s, and the displacement efficiency is 51.29 and the apparent viscosity is 456mPa s. The hydration depth of the slurry was improved by adding glycerol to the ordinary oil-based cement slurry in order to improve the utilization ratio of the plugging agent. It was proved by the experiment that the cement was added with 0.2% glycerol by mass. The hydration depth can be increased by 50% and has little effect on viscosity and displacement efficiency. The flow pattern of oil based cement slurry in the fracture is studied in laboratory. The natural Dali stone slab is used to simulate the carbonate rock fracture, and the oil based cement slurry is pumped into the simulated fracture to simulate the flow of the slurry in the fracture. Through the study of the flow law of cement slurry in the physical model and combined with the mathematical model, the following results are obtained: the flow resistance of oil based cement slurry in fracture is not high before water treatment, but compared with that of ordinary oil based cement slurry, The flow resistance of the oil based ultrafine cement slurry in the fracture is better and the flow resistance is lower than that of the ordinary oil based cement slurry, and the flow resistance of the oil based superfine cement slurry in the early stage of water treatment is still lower than that of the ordinary oil based cement slurry. However, because the hydration speed of ultrafine cement is faster than that of ordinary cement, the flow resistance of oil based superfine cement slurry is faster than that of ordinary oil based cement slurry. At room temperature, at about 15min, the flow resistance of oil based superfine cement slurry is higher than that of ordinary oil based cement slurry.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE256

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