CROSS-LINKED LIQUID AS SAND-CARRIER Russian patent published in 2008 - IPC C09K8/64 

FIELD: petroleum-extracting industry.

SUBSTANCE: invention relates, in particular, to development of viscous-elastic liquids as sand-carriers for hydraulic disruption of low-penetrable gas- and oil-carrying seams in order to enhance their oil output. Proposed cross-linked liquid as sand-carrier based on hydrocarbon liquid and gel-forming agent comprises as a gel-forming agent a mixture of complexes of lithium tert.-butyltrialkyl borates - K [t-C₄H₉OB(OR)₃]Li wherein R means (C₄-C₁₂)-alkyl, and a solvating agent - CA in the mole ratio K : CA = (1:1)-(1:2). As components of a gel-forming agent it comprises fraction of B(OR)₃ wherein R means (C₄-C₁₂)-alkyl, and lithium tert.-butylate t-C₄H₉OLi in their mole ratio = 1:1, and in the following ratio of these components, wt.-%: trialkyl borates, 0.5-10.0; lithium tert.-butylate, 0.2-2.5, and hydrocarbon liquid, the balance. CA represents a compound of the following classes: saturated alcohol ROH, dialkyl esters R₂O, primary H₂NR, secondary HNR₂, and tertiary alkylamines NR₃ wherein R means (C₄-C₁₂)-alkyl. Invention provides expanding assortment of gel-forming agents, improvement of technological effectiveness of process in preparing liquid and enhancing its thermosedimentation stability.

EFFECT: improved and valuable properties of liquid.

3 cl, 3 tbl, 34 ex