龙岗礁滩气藏气井垢污分析及堵塞机理研究
Analysis on Gas Well Dirt in Longgang Reef Reservoir and Study on its Blockage Mechanism
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- 引用格式:
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董正亮,陈大钧,侯绪林,刘丹宇,冯丹阳.龙岗礁滩气藏气井垢污分析及堵塞机理研究[J].天然气与石油,2014,32(2):0.doi:
Dong Zhengliang, Chen Dajun, Feng Danyang, Hou Xulin, Liu Danyu.Analysis on Gas Well Dirt in Longgang Reef Reservoir and Study on its Blockage Mechanism[J].Natural Gas and Oil,2014,32(2):0.doi:
- DOI:
- 作者:
- 董正亮1，2 陈大钧1 侯绪林3 刘丹宇3 冯丹阳1，2
Dong Zhengliang, Chen Dajun, Feng Danyang, Hou Xulin, Liu Danyu
- 作者单位:
- 1.西南石油大学化学化工学院，2.四川盐业地质钻井大队，3.西南油气田川中油气矿
1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, 2. Sichuan Salt Geology Drilling Team, 3. Middle Sichuan Oil and Gas Field, PetroChina Southwest Oil and Gas Field Company
- 关键词:
- 龙岗礁滩气藏；堵塞机理；模拟井况；微观形貌
Longgang Reef Gas Reservoir; Blockage mechanism; Simulated well conditions; Microscope observation
- 摘要:
- 针对四川盆地龙岗礁滩气藏在气井开发后期出现大量黑色固体和膏状垢污堵塞管串和储层，造成气井产量和压力急剧降低、酸化有效期缩短的现状，开展了堵塞机理分析。在堵塞物成分分析的基础上，结合XRD衍射仪分析，通过扫描电镜的微观形貌分析观察垢污组分之间的结合关系和组合状态，找出井下固体颗粒、残酸、油溶性外加剂和铁元素是影响堵塞物的主要因素。在模拟井况条件下对上述因素进行控制变量分析，以研究各因素对堵塞物形成的主要作用，探明该类气井的堵塞机理，即在高温高压条件下，入井液中油溶性组分与井下沉积的炭黑和硫等固体颗粒通过乳化、吸附作用形成高黏乳状液，同时残酸等入井液外加剂的高分子聚合物通过架桥吸附作用捕获井下固体颗粒形成凝胶体，二者综合作用使得井下出现大量黑色胶状堵塞物，并据此提出垢污防治建议。
In later stage of Sichuan Basin Longgang Reef Reservoir development, a large number of black solids and cream dirt appear and these solids and dirt block pipe strings and reservoirs, which results in sharp decrease of gas well production and shortening of acidification validity. Conducted is analysis on compositions of the blockages and blockage mechanism with the help of XRD diffractometer and analysis results show that underground solid particles, residual acid, oil soluble admixture and iron elements are the main factors resulting in blockage. Conducted is analysis on control variables of these factors in simulated well conditions and it is found out that in high temperature and high pressure conditions, oil soluble components in well-in fluid and such solid particles as carbon black and sulfur deposited in down hole produce high viscosity of emulsion under the action of emulsification and adsorption. Meanwhile, such high molecular polymer in well-in fluid admixture as reacted acid captures down hole solid particles under the action of adsorption bridge gels. The combination of the both results in a large number of black colloidal blockages. Hereby, put forward are proposal and measures for preventing and controlling blockages.
