低残余应变弹韧性水泥浆体系在平桥南区块页岩气井中的应用

doi:10.13809/j.cnki.cn32-1825/te.2020.01.014

Abstract

Abstract:

In the early stage of shale gas block in southern Pingqiao, the annular pressure phenomenon of casing production existed in high pressure shale gas wells, so that the elastic and ductile cement slurry system is optimized to improve the cementing quality and improve the long-term sealing ability of cement ring. Comprehensive analysis for the reason of this phenomenon is made, and through the physical simulation device, the sealing ability evaluation experiment of cement ring is carried out to reveal it. By interphase filling technology, the brittleness of cement is improved. Meanwhile, nano-emulsion filling technology is used to realize void filling and reduce porosity of cement and micro-ring gap. After the optimization of cement slurry system, the elastic modulus of cement slurry and the residual strain of cement slurry are reduced more than 10 % and 30 % respectively. As for as the field application of 6 wells in site, the cementing quality rate is 100 %, and the casing annulus pressure phenomenon has not happened yet. The application of low residual strain elastic ductile cement slurry system provides new technical method and means for shale gas wells to prevent annulus zone pressure, which have a good reference significance and popularization value.

Key words: shale gas, cementation, annulus band pressure, low residual strain, cement slurry

CLC Number:

TE256

LIU Junkang,TAO Qian,SHEN Wei,YAN Lianguo,DING Anxu. Application of low residual strain elastic ductile cement slurry system for shale gas wells in southern Pingqiao block[J].Reservoir Evaluation and Development, 2020, 10(1): 90-95.

Figures/Tables 12

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References 15

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材料类型	弹性模量与强度
材料类型	2 %加量	4 %加量	6 %加量	8 %加量
普通弹性粒子SFP	8.5/32.3	7.4/26.2	7.1/18.9	6.6/14.2
改性弹性粒子SFP-H	8.6/34.2	6.7/30.8	6.2/28.6	5.6/24.8

材料类型	渗透率
材料类型	2 %加量	4 %加量	6 %加量	8 %加量
微硅粉	0.28	0.22	0.20	0.17
胶乳	0.26	0.18	0.12	0.08
液硅	0.27	0.11	0.08	0.06

配方	流变	失水/mL	沉降稳定性/（g·cm^-3）	强度/MPa	弹性模量/GPa	渗透率/10^-3μm²
1#	220/140/98/78/4/2	48	0.05	32	7.1	0.12
2#	278/169/108/92/9/8	36	0	28.4	6.3	0.08
3#	>300/286/196/131/21/20	32	0	23.6	5.8	0.08
4#	>300/271/182/116/18/16	34	0	22.5	5.5	0.10
5#	282/171/109/94/11/8	32	0	28.6	6.3	0.05

井号	分段压裂段数/段	压裂最高施工压力/MPa	固井质量	弹性材料加量/%	弹性模量/GPa	是否带压
JYA-1HF	22	106.2	优质	6	6.3	否
JYA-4HF	22	100.9	优质	6	6.2	否
JYA-5HF	20	82.4	优质	6	6.3	否
JYB-1HF	17	89.6	优质	6	6.2	否
JYB-2HF	21	90.2	优质	6	6.0	否
JYB-4HF	21	102.4	优质	6	6.1	否

Application of low residual strain elastic ductile cement slurry system for shale gas wells in southern Pingqiao block

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