耐高溫油井水泥緩凝劑的合成與研究
發(fā)布時間：2018-11-12 07:47
【摘要】：固井是鉆完井作業(yè)過程中不可缺少的一個重要環(huán)節(jié),它主要包括以下兩個步驟:下套管和注水泥。而水泥漿外加劑又在注水泥作業(yè)中起著至關(guān)重要的作用。隨著油氣井鉆探深度的增加,井底的溫度、壓力不斷升高,對固井用水泥漿外加劑的性能也提出了更高地要求。當(dāng)前,國內(nèi)使用的高溫緩凝劑還普遍存在“分散性強(qiáng)”、“配伍性差”、“稠化實驗易鼓包、包芯”等問題,這將給固井施工帶來風(fēng)險。本文針對耐高溫緩凝劑所存在的上述問題,通過分子結(jié)構(gòu)設(shè)計,以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N-乙烯基吡咯烷酮(NVP)、丙烯酸(AA)和馬來酸酐(MAH)為聚合單體,以自由基水溶液聚合為聚合方法,合成了一種四元共聚物P(AMPS/NVP/MAH/AA)型緩凝劑。通過設(shè)計一個四因素三水平的正交實驗確定了該緩凝劑的最佳合成條件,即單體配比為AMPS/NVP/MAH/AA=7:0.75:1:1.25(質(zhì)量比)、溶液pH值為6、反應(yīng)溫度為45℃、APS加量為1%(占單體總質(zhì)量)。并將在最佳條件下合成的四元共聚物型緩凝劑命名為PANAM。采用IR和1H-NMR對緩凝劑PANAM的分子結(jié)構(gòu)進(jìn)行表征,結(jié)果表明AMPS、NVP、MAH和AA四種單體均成功參與了聚合反應(yīng),產(chǎn)物為目標(biāo)產(chǎn)物;采用DSC對緩凝劑PANAM的耐溫性能進(jìn)行考察,結(jié)果表明該緩凝劑耐溫性能良好,耐溫可達(dá)365℃。對緩凝劑PANAM的應(yīng)用性能進(jìn)行評價,結(jié)果表明該緩凝劑具有優(yōu)良的緩凝性能,較低的分散性能,優(yōu)異的抗鹽性能以及與其它外加劑具有良好的配伍性,同時該緩凝劑對水泥石的強(qiáng)度影響較小。以該緩凝劑為主劑的水泥漿體系綜合性能良好,能夠滿足不同密度體系不同鹽濃度條件下的固井需要,具有良好的應(yīng)用前景。采用掃描電鏡對緩凝劑PANAM的緩凝機(jī)理進(jìn)行了探究,PANAM的緩凝作用存在吸附機(jī)理或晶核毒化機(jī)理,也有兩種機(jī)理的協(xié)同作用。
[Abstract]:Cementing is an indispensable part of drilling and completion. It mainly includes two steps: casing down and cement injection. Cement slurry admixture plays an important role in cement injection. With the increase of drilling depth of oil and gas wells, the temperature and pressure of bottom hole are increasing, so the performance of cement slurry admixture for cementing is also required. At present, the domestic high temperature retarder also exists the problems of "strong dispersity", "poor compatibility", "thickening experiment is easy to drum, core" and so on, which will bring risks to cementing construction. In this paper, in view of the above problems existing in the high temperature retarder, through the molecular structure design, the 2-acrylamide 2-methylpropanesulfonic acid (AMPS),) N-vinylpyrrolidone (NVP),) was designed. A quaternary copolymer P (AMPS/NVP/MAH/AA) retarder was synthesized by free radical aqueous solution polymerization of acrylic acid (AA) and maleic anhydride (MAH). The optimum synthesis conditions of the retarder were determined by designing a four-factor and three-level orthogonal experiment. The monomer ratio was AMPS/NVP/MAH/AA=7:0.75:1:1.25 (mass ratio), the pH value of solution was 6, and the reaction temperature was 45 鈩，
本文編號：2326510
[Abstract]:Cementing is an indispensable part of drilling and completion. It mainly includes two steps: casing down and cement injection. Cement slurry admixture plays an important role in cement injection. With the increase of drilling depth of oil and gas wells, the temperature and pressure of bottom hole are increasing, so the performance of cement slurry admixture for cementing is also required. At present, the domestic high temperature retarder also exists the problems of "strong dispersity", "poor compatibility", "thickening experiment is easy to drum, core" and so on, which will bring risks to cementing construction. In this paper, in view of the above problems existing in the high temperature retarder, through the molecular structure design, the 2-acrylamide 2-methylpropanesulfonic acid (AMPS),) N-vinylpyrrolidone (NVP),) was designed. A quaternary copolymer P (AMPS/NVP/MAH/AA) retarder was synthesized by free radical aqueous solution polymerization of acrylic acid (AA) and maleic anhydride (MAH). The optimum synthesis conditions of the retarder were determined by designing a four-factor and three-level orthogonal experiment. The monomer ratio was AMPS/NVP/MAH/AA=7:0.75:1:1.25 (mass ratio), the pH value of solution was 6, and the reaction temperature was 45 鈩，
本文編號：2326510
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