地层渗流水对凝固过程固井水泥浆的侵扰机理

doi:10.11896/cldb.23070062

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Abstract There are two major problems inthe cementing engineering of the adjustment wells under seepage water intrusion, the first, in engineer, water intrusion reduces the zone isolation quality of hardened cement-sheath and oilfield development benefit, the second, in science, the intrusion mechanism of the seepage water on the cement slurry during setting process is unclear. Aiming to these, this work established a testing device for seepage water intrusion during cement slurry setting process to record the electrical conductivity of exudate water and bonding state between cement slurry and rock core interface, Low-field NMR and electrical methods were applied to measure the pore size distribution and pore connectivity of the cement slurry during setting process. And then, the intrusion mechanism of the seepage water on the cement slurry during setting process was analyzed. Experimental results showed that the seepage water destroyed the interface bond between hardened cement slurry and rock core to form a gap with 1—2 mm wideth. On the electrical conductivity of the seepage water, because the rapid dissolution of ions in cement slurry into exudate water from 2.5 h to 5.5 h of setting time, the exudate water’s electrical conductivity increased from 261.44 μS/cm to 429.30 μS/cm, increased by 312.0% compared with the water before INFILTRATION. During setting process, the microstructureof cement slurry developed from “dispersed particle structure” to “gel network structure”, which caused pore hydrostatic pressure to drop rapidly to zero within hours. With a hydrated time of 10 h, a large number of connected pores existed and the pore connectivity was 0.59—0.67 in the cement slurry, which was highly susceptible to seepage water intruding to replace its pore solution. Based on “dissolution-nucleation-precipitation” hydration theory, the hydration degree and designed properties of the cement slurry were destroyed. And then decreased the zone isolation quality of hardened cement-sheath and cementing quality.

Key words： adjustment well cementing intrusion mechanism seepage water microstructure electrical conductivity hydration behavior

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TE122.3

Fund:National Natural Science Foundation of China (52104007) and Open Fund of National Key Laboratory (PLN2023-35).

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	Articles by authors
	LIU Kaiqiang
	YU Junjie
	WANG Haiping
	ZHANG Xiayu
	JIN Cheng
	ZHANG Xingguo

Cite this article:

LIU Kaiqiang,YU Junjie,WANG Haiping, et al. Intrusion Mechanism of Seepage Water on the Cement Slurry During Setting Process[J]. Materials Reports, 2024, 38(24): 23070062-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.23070062 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23070062

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