摘要
针对现有玻璃纤维、聚丙烯纤维、剑麻纤维、陶瓷纤维等纤维材料的尺寸过大及加量过大导致水泥浆混拌过程中混配困难和浆体增稠的难题,研发了具有形状记忆功能的温敏形变纤维胶囊。当温度低于形变响应温度时,纤维胶囊的粒径较小,在漏失通道内形成高密度颗粒填充;当温度达到形变响应温度后,纤维胶囊激活发生膨胀变形,高密度颗粒之间相互挤压充填,在漏失通道内高强度架桥堆积,进而封堵漏失层。该纤维胶囊可将6 mm的纤维封装在3 mm的胶囊中,从而提高纤维材料在堵漏水泥中的有效含量及尺寸,改善水泥浆封堵能力,降低工作过程中的漏失风险,保证固井质量。加入温敏形变纤维胶囊堵漏剂的水泥浆流动度均值为22 cm,初始稠度为25 Bc,与纯水泥浆相似,相比于直接添加纤维材料,水泥浆体流态明显改善,可泵性大幅度增强,同时水泥石抗压强度也大幅提高,堵漏剂加量为5%时水泥石7 d的抗压强度可达50 MPa,解决了纤维水泥浆混配困难和浆体增稠的难题,对保证固井质量具有一定的实际意义。
A temperature-sensitive deformable fibrous capsule with shape memory has been developed to address the difficulties in mixing cement slurries and the slurry thickening problem caused by the oversize and excessive dosage of the fibrous materials presently in use,such as glass fiber,polypropylene fiber,sisal fiber and ceramic fiber etc.When the ambient temperature is lower than the deformation-response temperature,the particle sizes of the fibrous capsules are relatively small,therefore it is easy for the capsule particles to form high density particle packing in passages through which cement slurries are lost.When the ambient temperature reaches the deformation-response temperature,the fibrous capsules are activated and begin to expand,causing the particles packed in high densities to squeeze each other and to form high strength bridging inside the passages.The losses of the cement slurries are thus effectively brought under control.The process with which the fibrous capsules are produced can encapsulate 6 mm fibers into a 3 mm capsule,thereby increasing the effective concentrations and sizes of the fibers in loss-control cement slurries,improving the plugging performance of the cement slurries,minimizing the risks of fluid losses and ensuring the job quality of well cementing.The average fluidity of a cement slurry treated with the temperature-sensitive deformable fibrous capsules is 22 cm,and the initial consistency of the cement slurry is 25 Bc,comparable to the consistency of the pure cement slurry.Compared with cement slurries directly treated with fibrous materials,the cement slurry treated with the temperature-sensitive deformable fibrous capsules has rheology and pumpability that are significantly improved and the compressive strength of the set cement is greatly increased.The 7 d compressive strength of a set cement containing 5%temperature-sensitive deformable fibrous capsules reaches 50 MPa.The development and application of the temperature-sensitive deformable fibrous capsules help solve the difficulties encountered in cement slurry mixing and the slurry thickening problem,and are of significance to the success of high-quality well cementing operation.
作者
田辉
步玉环
胡苗苗
沈晟达
曹成章
TIAN Hui;BU Yuhuan;HU Miaomiao;SHEN Shengda;CAO Chengzhang(College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;Sinopec Shengli Petroleum Engineering Co.,Ltd.,Dongying,Shandong 257000;National Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)),Qingdao,Shandong 266580;School of Chemical Engineering,Tianjin University,Tianjin 300350)
出处
《钻井液与完井液》
CAS
北大核心
2024年第5期630-639,共10页
Drilling Fluid & Completion Fluid
基金
国家自然基金“深水油气井固井水泥传质传热过程中浅层水合物稳定机理”(51974355)。
关键词
形状记忆材料
油井水泥
堵漏剂
Shape memory material
Oil well cement
Lost circulation material
