本文選題：星型聚合物 + AMPS　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：水基鉆井液在高溫下流變性不穩(wěn)定,濾失量大大增加。目前國內(nèi)外傳統(tǒng)的方法都是采用線型的水溶性改性天然聚合物或者合成的聚合物來控制水基鉆井液的高溫流變性和濾失量。這些線型聚合物處理劑要么在高溫下發(fā)生熱降解;要么在高溫下可以控制鉆井液的濾失量,但又會導(dǎo)致鉆井液體系的黏度過大,高溫作用下流變性的穩(wěn)定和濾失量控制是目前高溫水基鉆井液仍未解決的技術(shù)難題。星型聚合物是由多個線型支鏈依靠化學(xué)鍵連接至同一個中心支點或核上所形成的支化聚合物。與相同分子量的線型聚合物相比,星型聚合物具有更低的本體和溶液黏度,同時星型聚合物具有更好的熱穩(wěn)定性和溶解性。本文開展了星型丙烯酰胺和2-丙烯酰胺基-2-甲基丙磺酸共聚物對水基鉆井液流變性和濾失量的影響。主要研究內(nèi)容如下:(1)合成了三種不同分子量的星型共聚物并對其進(jìn)行表征制取了苯乙烯(St)和馬來酸酐(MAH)的交替共聚物Poly(St-alt-MAH)作為側(cè)基,合成水溶性的多官能度大分子引發(fā)劑;然后多官能度大分子引發(fā)劑激發(fā)丙烯酰胺(AM)和功能性單體2-丙烯酰胺基-2-甲基丙磺酸(AMPS)的水溶液共聚合,制備了三種不同分子量的中心為Poly(St-alt-MAH),支鏈為丙烯酰胺和2-丙烯酰胺基-2-甲基丙磺酸共聚物Poly(AM-co-AMPS)的星型結(jié)構(gòu)共聚物S-Poly(AM-co-AMPS),并對其進(jìn)行表征。實驗發(fā)現(xiàn)S-Poly(AM-co-AMPS)的熱穩(wěn)定性隨分子量的增加而加強。(2)探究不同分子量、不同結(jié)構(gòu)的聚合物對水基鉆井液流變性的影響采用賓漢模式和冪律模式探究不同分子量的S-Poly(AM-co-AMPS)在不同濃度條件下,對水基鉆井液老化前后流變特性的影響;合成了相同分子量的線型丙烯酰胺和2-丙烯酰胺基-2-甲基丙磺酸共聚物L(fēng)-Poly(AM-co-AMPS),與S-Poly(AM-co-AMPS)作對比,采用ZNN-D6六速旋轉(zhuǎn)黏度計和Fann 50 SL高溫高壓流變儀兩種測試方法研究了具有不同結(jié)構(gòu)的聚合物對水基鉆井液流變特性的影響。實驗發(fā)現(xiàn)濃度為0.3%、分子量為2000萬的S-Poly(AM-co-AMPS)維持高溫條件下鉆井液穩(wěn)定的能力更強。(3)探究不同分子量、不同結(jié)構(gòu)的聚合物對水基鉆井液濾失量的影響與相同分子量的L-Poly(AM-co-AMPS)作對比,研究了S-Poly(AM-co-AMPS)在不同濃度條件下,對水基鉆井液老化前后API濾失量和HTHP濾失量的影響。實驗發(fā)現(xiàn)分子量為2000萬、濃度為0.3%的S-Poly(AM-co-AMPS)對鉆井液的降濾失作用效果顯著。
[Abstract]:The rheological behavior of water-based drilling fluid is unstable at high temperature, and the filtration loss is greatly increased. At present, the traditional methods at home and abroad are to control the high temperature rheology and filtration of water-based drilling fluid by using linear water-soluble modified natural polymer or synthetic polymer. These linear polymer treatment agents are either thermally degraded at high temperatures or can control fluid filtration at high temperatures, but can lead to excessive viscosity in the drilling fluid system. The stability of rheology and the control of fluid loss under high temperature are still unsolved technical problems of high temperature water-based drilling fluid. Star polymer is a branched polymer formed by several linear branched chains connected to the same central fulcrum or nucleus by chemical bond. Compared with linear polymers with the same molecular weight, star polymers have lower bulk and solution viscosity, and star polymers have better thermal stability and solubility. The effects of star-shaped acrylamide and 2-acrylamido-2-methylpropanesulfonic acid copolymers on the rheological properties and filtration loss of water-based drilling fluids were studied in this paper. The main research contents are as follows: (1) three star copolymers with different molecular weights were synthesized and characterized. The alternative copolymers of styrene (St) and maleic anhydride (MAHH) were synthesized as side groups to synthesize water-soluble multifunctional macromolecular initiators. Then the polyfunctional macromolecular initiator activates the aqueous solution copolymerization of acrylamide (AM) and the functional monomer 2-acrylamide (2-methylpropyl) sulfonic acid (AMPS). Three star structure copolymers, S-PolyAM-co-AMPS-, with different molecular weights, were prepared and characterized, with a branch chain of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid copolymer (Polyacrylamide-co-AMPS-). It was found that the thermal stability of S-PolyAM-co-AMPS) was enhanced with the increase of molecular weight. Effects of Polymer with different structure on Rheological Properties of Water-based drilling fluid the effects of different molecular weight S-PolyAM-co-AMPS) on the rheological properties of water-based drilling fluid before and after aging were investigated by Bingham model and power law model. Linear acrylamide and 2-acrylamide 2-methylpropanesulfonic acid copolymers with the same molecular weight were synthesized and compared with S-PolyAM-co-AMPSs. The effects of polymers with different structures on the rheological properties of water-based drilling fluids were studied by using ZNN-D6 six-speed rotary viscometer and Fann 50SL high temperature and high pressure rheometer. It was found that S-PolyAM-co-AMPS with a concentration of 0.3 and a molecular weight of 20 million had stronger ability to maintain the stability of drilling fluid at high temperature.) the effects of polymer with different molecular weight and structure on filtration loss of water-based drilling fluid were compared with L-PolyAM-co-AMPSwith the same molecular weight. The effects of S-PolyAM-co-AMPS on the filtration of API and HTHP before and after aging of water-based drilling fluid under different concentrations were studied. It was found that S-PolyAM-co-AMPS with a molecular weight of 20 million and a concentration of 0.3% had a remarkable effect on the filtration loss of drilling fluid.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE254

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