Abstract
The mud cake solidification (MCS) at cement-formation interface (CFI) is a key to improve the liner cementing quality and zonal isolation ability for preventing gas migration after hydraulic fracturing in high temperature high pressure (HTHP) tight gas wells. This paper introduces a new method of MCS, consisting of mud cake solidification agents (MCSAs) (GJE-I and GJE-II) as spacers in front of cement slurry. When the curing time is 3, 7 and 15 days at 132°C and 21 MPa, compared with the conventional method, the bond strength at CFI was improved by 907.16%, 829.57% and 988.45%, respectively. Moreover, the compatibility of MCSAs meets the requirements for liner cementing operation of HTHP tight gas wells. The field application shows that the qualified ratio of cementing quality is 100%, the ratio of high quality is up to 90.00% and the gas migration rate after well cementing and hydraulic fracturing decrease rapidly to zero. [Received: January 3, 2018; Accepted: June 3, 2018]
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