2 results about "Multiple fracture" patented technology

This invention relates to the field of oil and gas reservoir geological exploration technology, specifically a method for identifying multiple fracture stages in buried hill oil and gas reservoirs based on tectonic stress field evolution. The method includes the following steps: Tectonic evolution history analysis step: Geological data of the target buried hill oil and gas reservoir area are systematically collected. Based on seismic profiles, stratigraphic contact relationships, tectonic deformation characteristics, and chronological data, a comprehensive analysis is conducted to construct a multi-stage tectonic evolution history of the area from the Paleozoic to the Cenozoic, accurately determining the geological age and tectonic nature of each key tectonic event. Compared to existing technologies, this application establishes a quantitative discrimination model based on mechanical principles through paleostress field numerical simulation and quantitative prediction of theoretical fracture parameters. This standardizes and quantifies the fracture stage identification process, significantly reducing the uncertainty caused by human factors, improving the objectivity and repeatability of the discrimination results, and achieving a leap from qualitative analysis to quantitative discrimination.

This invention discloses a coalbed methane fracturing fluid system and a method for balanced propagation of multiple fractures, relating to the field of coalbed methane extraction technology. The coalbed methane fracturing fluid system includes a main fluid base as the transport medium, ceramic particles as proppant, coated heat-generating microcapsules, and a self-responsive diverting agent. The core material of the heat-generating microcapsules is a solid substance that releases heat upon contact with water. Its coating layer has temperature-responsive characteristics, softening and rupturing when a temperature threshold is reached, releasing heat to reduce the viscosity of the fracturing fluid. The self-responsive diverting agent has a core-shell structure; its outer shell hydrolyzes at specific temperatures and pH levels, causing the core elastomer to absorb water and expand. It can selectively and autonomously seal wide fractures according to the fracture width, guiding the fracturing fluid to narrower, less expanded fractures. The method includes: first, injecting a pre-fluid containing coated heat-generating microcapsules; then adding proppant and diverting agent and pumping sand-carrying fluid; finally, shutting in the well and controlling flowback. This optimizes fracture conductivity, promotes balanced propagation of multiple fractures, and improves extraction efficiency.