Research and application of acidizing fluid for complex lithology bauxite reservoir stimulation in the Longdong area of the Ordos Basin
Received date: 2024-01-08
Revised date: 2024-04-02
Online published: 2024-06-11
Supported by
The Technology Project of Changqing Oilfield Company,PetroChina(2022KT0504)
The vertical lithology of bauxite reservoirs in the Longdong area is complex， and the problems of fracturing failure and difficulty during the fracturing process are prominent. In order to solve the problems of high construction pressure and difficulty in fracturing reservoirs in Longdong bauxite， an acid research and development approach with clay minerals other than acid soluble bauxite as the main target has been proposed， and a multi effect coupling active acid system has been innovatively formed. The retarding mechanics and ionization experiments indicate that multi-functional acids are a type of weak acid that can form a multi-level reversible equilibrium system in solution and have six types. They mainly achieve a slowing effect on rocks and minerals through multi-level ionization characteristics. The dissolution experiment shows that the dissolution rate of the multi effect acid system on class II and III bauxite rock cores reaches 20%-42%. The chelation test experiment shows that the multi effect acid can effectively inhibit the production of calcium fluoride precipitation. By optimizing and evaluating the main active acid and auxiliary corrosion inhibitors， a multi-functional acid system was optimized. The mine has completed pilot tests， with a pressure drop of up to 10-22 MPa， indicating a good effect of pressure reduction transformation.
Key words： Bauxite rock; Multi-functional acid; Retarding; Complexation; Acidizing effect
Kai ZU , Hanbin LIU , Xiaoyong WEN , Hui LI , Baoqiang LÜ , Xuefeng DING , Yajuan WANG . Research and application of acidizing fluid for complex lithology bauxite reservoir stimulation in the Longdong area of the Ordos Basin[J]. Natural Gas Geoscience, 2024 , 35(8) : 1480 -1487 . DOI: 10.11764/j.issn.1672-1926.2024.04.006
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