In response to the problems of easy closure of acid-etched fractures and rapid attenuation of conductivity caused by acid fracturing in ultra-deep wells, a new acid-fracturing shielding protectant was synthesized and evaluated for its key indicators such as self-agglomeration, oil solubility and adhesion. This technology blocks the acid-rock reaction by discontinuously and temporarily shielding the surface of the hydraulic fracture, and realizes the transformation of acid-etched fractures from point support to surface support, and the effective support height of the fracture can be increased by 3 times. CFD software simulation was used to optimize the distribution pattern of shielding protective agent particles in the fractures and to determine the process parameters such as shielding protective agent dosage, injection and displacement rates, and carrier fluid type. The technology was applied to ultra-deep wells with high temperature in Tahe Oilfield. The results after fracturing showed that the adhesion and oil solubility of shielding agent at formation temperature met the design requirements, and the conductivity and service life of unpropped fractures were significantly prolonged. This technology plays an important role in the improvement of acid fracturing effect in ultra-deep wells.
Zhou Linbo
,
Liu Honglei
,
Li Dan
,
Zhang Junjiang
,
Zhou Jun
. Acid Fracturing Technology for High-conductivity Unpropped Fractures in Ultra-deep Wells with High Temperature in Carbonate Reservoirs[J]. Special Oil & Gas Reservoirs, 2022
, 29(3)
: 144
-149
.
DOI: 10.3969/j.issn.1006-6535.2022.03.021
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