钻井液与完井液2018，Vol.35Issue(2)：29-34,39,7.DOI:10.3969/j.issn.1001-5620.2018.02.004
松科2井抗超高温钻井液技术
Ultra-high Temperature Drilling Fluid Technology of Well Songke-2
许洁 1乌效鸣 2王稳石 1闫家 1张恒春 1曹龙龙1
作者信息
- 1. 中国地质科学院勘探技术研究所,河北廊坊 065000
- 2. 中国地质大学(武汉)工程学院,武汉 430074
- 折叠
摘要
Abstract
The well Songke-2 is a high temperature deep scientific exploration well deployed in the Songliao Basin, its purpose is to penetrate the Cretaceous formations to obtain the records of basal continental deposit. The bottom hole temperature has been predicted to be over 220 ℃. Measures for preventing borehole wall collapse are especially important in drilling the fourth and fifth intervals since borehole wall collapse has occurred previously in drilling the interbedded mudstone and sandstone in the Shahezi formation, and the broken tuff, mudstone and coal seam in the Huoshiling formation, which were to be penetrated by the fourth and fifth intervals of the well. Continuous coring was to be conducted in the fourth and fifth intervals, and frequent tripping of drill string gave a big challenge to borehole wall stabilization because of long time contact of the open hole with drilling fluid. The adoption of different drilling techniques in turn gave a challenge to drilling fluid. A high temperature polymer drilling fluid has been formulated to deal with these challenges. The composition of the drilling fluid is as follows: 1.0％ bentonite + 2％ attapulgite +0.2％KOH +(0.5％-1.0％) high MW filter loss reducer +1％ moderate MW filter loss reducer + 2.5％ filming agent + (2％-4％)SMC +2％FT +3％KCl + 2％NaCOOH +3％ white oil. At the beginning of the fourth interval, the mud left over from the third interval was evaluated and converted for re-use in the fourth interval based on large amount of pilot tests. In the fifth interval, the property of the mud was greatly modified because of the needs for dealing with downhole troubles. When the downhole troubles were resolved, the mud property was gradually adjusted to a stable state. In field application the mud property was adjusted at all times in accordance with the requirements of drilling operations. The mud had good rheology at high temperatures and good high temperature stability. High temperature resistance of the mud formulation was 240 ℃ based on laboratory test. The mud property was still satisfactory even after hot rolling for 72 ℃, providing strong technical support for the success of drilling operation. The drilling fluid technology used in drilling the well Songke-2 is of guiding significance in improving job quality of drilling and reducing exploration cost.关键词
岩心钻探/松科2井/超高温/抗高温聚合物钻井液/高温流变性/沉降稳定性/凹凸棒土Key words
Core drilling/Well Songke-2/Ultra-high temperature/High temperature polymer drilling fluid/High temperature rheology/Settlement stability/Attapulgite分类
能源科技引用本文复制引用
许洁,乌效鸣,王稳石,闫家,张恒春,曹龙龙..松科2井抗超高温钻井液技术[J].钻井液与完井液,2018,35(2):29-34,39,7.
