發(fā)布時(shí)間：2019-05-17 17:08

【摘要】：設(shè)計(jì)、調(diào)配出綜合性能優(yōu)異的油井水泥漿是固井工程中保證固井質(zhì)量的一個(gè)重要步驟。油氣井所在的地質(zhì)環(huán)境正變得越來(lái)越復(fù)雜,如高溫、凍土、滲漏及鹽膏地層等。因此,對(duì)水泥漿性能的要求也隨之提高。在水泥性能限定的條件下,提高水泥漿的性能是通過(guò)向水泥中加入如降失水劑、緩凝劑等添加劑來(lái)實(shí)現(xiàn)的。然而,當(dāng)前國(guó)內(nèi)適宜于低溫條件下使用的降失水劑,存在抗鹽能力差的問(wèn)題：而能在高溫條件下使用的降失水劑,又會(huì)出現(xiàn)水泥漿在低溫下候凝時(shí)間過(guò)長(zhǎng)、高溫下發(fā)生沉降等不利于提高固井質(zhì)量的現(xiàn)象。為克服降失水劑存在的上述缺點(diǎn),本文通過(guò)優(yōu)化降失水劑分子鏈上的功能基團(tuán),優(yōu)選出N,N-二甲基丙烯酰胺(DMAA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、順丁烯二酸酐(MA)和環(huán)狀的N-乙烯基吡咯烷酮(NVP)等共聚單體；依據(jù)降失水劑控失水效果及其對(duì)水泥漿凝固時(shí)間影響,優(yōu)化聚合條件與單體配比；得到了綜合性能最佳的抗鹽弱緩凝性降失水劑SRSTF。聚合物SRSTF的紅外和核磁共振譜圖分析證實(shí)四種單體均已成功聚合至降失水劑分子鏈上；熱失重實(shí)驗(yàn)表明SRSTF聚合物的初始分解溫度達(dá)277℃,表現(xiàn)出優(yōu)異的熱穩(wěn)定性。對(duì)SRSTF降失水劑在水泥漿中的綜合性能進(jìn)行評(píng)價(jià)表明：降失水劑能夠?qū)⒌鞍腼柡望}水水泥漿的API失水量控制在100 mL以內(nèi),且在較寬的實(shí)驗(yàn)溫度范圍內(nèi)其控失水性能顯示出良好的穩(wěn)定性；30℃下,降失水劑對(duì)水泥漿的凝固時(shí)間與水泥石的強(qiáng)度發(fā)展影響小；用SRSTF降失水劑配制的水泥漿稠化時(shí)間適宜、稠化曲線平穩(wěn)、穩(wěn)定性及流動(dòng)性好；與其它油井水泥添加劑的配伍性好,可滿足不同溫度與不同鹽濃度條件下的固井工藝要求,具有良好的實(shí)用性。
[Abstract]:The design and deployment of oil well cement slurry with excellent comprehensive performance is an important step to ensure the cementing quality in cementing engineering. The geological environment of oil and gas wells is becoming more and more complex, such as high temperature, frozen soil, leakage and salt paste formation. Therefore, the performance requirements of cement slurry are also improved. Under the condition of limited performance of cement, the performance of cement slurry is improved by adding additives such as water loss reducer and retarder to cement. However, at present, there is a problem of poor salt resistance of water loss reducing agent suitable for use at low temperature in China, and the water loss reducing agent which can be used at high temperature will cause cement slurry to wait too long at low temperature. Settlement at high temperature is not conducive to improving cementing quality. In order to overcome the above shortcomings of water loss reducer, N, N-dimethyl acrylamide (DMAA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), was selected by optimizing the functional groups on the molecular chain of water loss reducer. Maleic anhydride (MA) and cyclic N-vinylpyrrolidone (NVP) were comonomers. According to the effect of water loss control agent and its effect on solidification time of cement slurry, the polymerization conditions and monomer ratio were optimized, and the salt resistant weak retarding agent SRSTF. with the best comprehensive properties was obtained. The infrared and nuclear magnetic resonance spectra of polymer SRSTF confirmed that the four monomers had been successfully polymerized into the molecular chain of water loss reducer, and the thermal weight loss test showed that the initial decomposition temperature of SRSTF polymer was 277鈩，

本文編號(hào)：2479274