A油田结蜡规律及清蜡方法研究

A油田属于小而肥的高品位油田，埋藏浅、油层单一、胶结疏松、高孔、高渗、稀油、边水活跃、初期产量高，但是原油中含蜡量高达6％左右，开采过程中结蜡容易造成自喷井油嘴堵塞、机抽井卡光杆、地面管残堵塞而影响正常生产。通过开展恒温溶蜡实验，矿场总结单井结蜡规律，采取区别对待，根据油压、套压、回压变化，对自喷井检查油嘴、启抽、热洗井筒及地面管线、机械刮蜡等有效措施，投入开发三年以来没有一口井和一条管线发生过蜡卡事故，油井生产平稳有序，集输管线安全畅通，以甲方12人的经营团队累积产油72×10^4t，采收率50％，自然递减为-7％，综合含水仅1．6％。

Paraffinning law and paraffinremoval method of A oilfield

A oilfield was a high-quality oil field with shallow buried depth, single reservoir, loose cementation, high porosity, high permeability, thin oil, and active edge water. Its initial potential production was high, but paraffin content of crude oil was as high as 6 %, and in the production process, paraffinning caused choke plugging of flowing wells, polish rod stucking of artificial lift wells, and ground pipeline block so that normal production was affected. By constant temperature paraffin melting experiment, single-well paraffinning law was summarized, and according to oil pressure, set pressure, back pressure changes, differential treatment was taken. For flowing wells, choke check, wellbore hot washing and ground shaft, mechanical paraffin scraping and other effective measures were taken, and no polish rod stucking was happened caused by paraffinning for 3 years since A oilfield was put into production. Oil production was well organized, well and pipelines were Safe and straightaway, cumulative oil production of A well was 72 ×10^4 t, oil recovery rate was 50%, natural decline was - 7% and water cut was only 1.6%,