第33卷第3期 2016年5月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi:10.3696/j.issn.1001-5620.2016.03.024
Vol.33No.3 May2016
氯化钾溶液浓度影响页岩气储层解吸能力室内实验
郑力会1，2，魏攀峰，楼宣庆"，孙昊1，付毓伟，聂帅帅！（1.中国石油大学（北京）石油工程学院，北京102249；2.油气钻井技术国家工程实验室防漏堵漏技术研究室，武汉431000）郑力会等.氧化钾溶液浓度影响页岩气储层解吸能力室内实验[1].钻井液与完井液，2016，33（3)：117-122
摘要页岩气储层伤害研究未涉及钻井完井流体盐浓度对储层解吸能力的伤害。参熙常规储层敏感性评价的岩样尺度，用不同浓度KCI溶液作为污染流体研究了解吸盐敏。室内用直径为38mm的龙马溪组页岩柱塞模拟储层，控制温度为60℃、围压为20MPa，每8min用气相色谱仅检测柱塞入口出口端纯度为99.99%的甲烧气变化，入口出口速率相等
时，认为柱塞吸附饱和，在初始压差0.001～0.01MPa
次吸附饱和后用3.5MPa压力封闭出入口端，
控制压为不
20000以及40000mg/L的KCI溶液伤害页岩柱塞
解吸总量和解吸速率，每种浓度溶液进行2次平行实检。
224min原始解吸总量和解吸速率。
用同样柱塞，再
1mL/min的速度注入2000、5000、10000、
与测量原始解吸总量和解吸速率相同的条件下测量伤害甲烷平灼解吸总量随着KCI溶液浓度增加由原始0.009209、
、0.004263、0.004232、0.003229、0.003441mmol，解
0.007758、0.007708、0.006502、0.008027mmol降为0.000565、
受总量伤害率为93.74%、45.22%、
、57.09%；平均解吸速率由原始0.000041、0.000035、0.000040、
50.207%
0.000029、0.000036mmol/min降为0.000005、0.000020、0.000025、
0.000016、
，0.000018mmol/min，解受速率伤害率为
85.78%、36.87%、35.42%、38.88%、47.34%。表明KC1溶液浓度影响页岩气储层解吸量和解吸速率，为钻井完井流体及储层改造流体提出性能界限。
关键词页岩气井；储层伤害；吸附；解吸；解吸敏感；解吸整敏；敏感程度
中图分类号：TE257.6
文献标识码：A
文章编号：1001-5620（2016）03-0117-06
LaboratoryExperiments on theEffect of KCI Concentration on Desorption Capacity of Reservoir Rocks
ZHENGLihui'-2,WEIPanfeng',LOUXuanqing',SUNHao',FUYuwei',NIEShuaishuai
(1.College ofPetroleumEngineering,China University of Petroleum,Beijing102249;2.ResearchTeam ofLostCirculation
Control, NationalKeyOilandGasDrillingEngineeringLaboratory,Wuhan,Hubei431000)
Abstract In studying the damages to shale gas reservoirs, the damages to the desorption capacity of reservoir formations caused by the salinity of drilling/completion fluids have not been studied. In our laboratory studies, a shale piston plunger (diameter = 38 mm) made from the Longmaxi formation was used to simulate the reservoir formations. In the experiment, temperature was controlled to 60 °C, and confining pressure to 20 MPa. The flowrates of the methane (purity 99.99%) at both the inlet and outlet of the piston plunger were measured every 8 min with gas chromatograph. If the flowrate at the inlet and the flowrate at the outlet were equal, then the
ne. At initial pressures ranging between 0.001 MPa and 0.01 MPa, the
piston plunger can be regarded as saturated with adsorbed methant
original total desorption volume and rate of desorption were measured for a consecutive 224 min period. The same piston plunger was re-saturated with methane, and the inlet and outlet were sealed with a constant pressure of 3.5 MPa, then inject at the outlet into the piston plunger with KCI solution of2 000, 5 000, 10 000, 20 000 and 40 000 mg/L at a rate of 0.1 mL/min, and contaminate the piston plunger for 1 h. Measured the total desorption volume and rate of desorption at the same conditions as when measuring the original total desorption volume and rate of desorption. The measurement for each KCI concentration was tested twice. With an increase in KCI concentration, the average total desorption volume of methane decreased from the original 0.009 209, 0.007 758, 0.007 708, 0.006 502 and 0.008 027 mmol to 0.000 565, 0.004 263, 0.004 232, 0.003 229 and 0.003 441 mmol, respectively, and the percentages of damage
国00）国 20909）
第一作者简介：郑力会，1968年生，博士生导师，楚天学者特聘教授，主要从事防漏堵漏和吸附气储层伤害防治研究，
电话（010）89732207；E-mail：zhenglihuicup.edu.cn。万方数据