抗高温微交联聚合物降滤失剂的制备与性能评价

Preparation and Performance Evaluation of Micro-crosslinking Polymer Filtration Reducer with High Temperature Resistance

戎克生 杨彦东 徐生江 邓 平 蒲晓林 罗 霄

RONG Kesheng YANG Yandong XU Shengjiang DENG Ping PU Xiaolin LUO Xiao

为提高聚合物降滤失剂耐温抗盐性和与高密度高固相深井钻井液体系的配伍性，以自制的六烯基单体TDED为交联剂，与丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）和 N-乙烯基吡咯烷酮（NVP）进行自由基共聚反应，制得微交联共聚物降滤失剂 PTAPN。通过红外光谱仪表征了产物结构，研究了 PTAPN的抗温耐盐性及与不同密度钻井液的配伍性。结果表明，产物分子结构与设计相符。PTAPN在高温、高矿化度环境中具备良好的降滤失性能。加入 2% PTAPN 后，淡水与复合盐水基浆 240℃老化前后的黏度增加，滤失量大幅降低。PTAPN与不同密度水基钻井液的配伍性良好，可有效控制密度为2.30 g/cm3的加重钻井液在高温环境中的流变性与滤失量。当老化温度为240℃时，加重钻井液的API滤失量与高温高压滤失量分别为2.6 mL和12.6 mL，远小于含常规线性聚合物降滤失剂的钻井液。PTAPN适于作为高温高密度钻井液体系的降滤失剂。图2表 5参 17

In order to improve the temperature and salt resistance of polymer fluid loss additive and the compatibility with high density and high solid phase deep well drilling fluid system，the self-made hexene monomer TDED was used as a crosslinking agent， and acrylamide （AM）， 2-acrylamide-2-methylpropanesulfonic acid （AMPS） and N-vinylpyrrolidone （NVP） were subjected to free radical copolymerization to prepare a micro-crosslinking copolymer fluid loss additive PTAPN. The structure of the product was characterized by infrared spectrometer. The temperature and salt tolerance of PTAPN and the compatibility with different density drilling fluids were studied. The results showed that the molecular structure of the product was consistent with the design. PTAPN had good fluid loss performance in high temperature and high salinity environments. After adding 2% PTAPN，the viscosity of fresh water and composite brine base slurry increased before and after aging at 240℃ ，and the fluid loss greatly reduced. PTAPN had good compatibility with different density water-based drilling fluids，which could effectively control the rheology and fluid loss of heavy drilling fluid with a density of 2.30 g/cm3 in high temperature environment. When the aging temperature was 240℃，the API fluid loss and high temperature and high pressure fluid loss of weighting drilling fluid was 2.6 and 12.6 mL，respectively，which was much smaller than that of drilling fluid containing conventional linear polymer fluid loss additive. PTAPN was suitable as a fluid loss additive for high temperature and high density drilling fluid systems.