Fracturing method capable of improving sand-carrying performance of fracturing liquid

Abstract

The invention provides a fracturing method capable of improving the sand-carrying performance of fracturing liquid. The method comprises the following steps: dispersing degradable fibers by virtue of a dispersion device, and uniformly dissolving the dispersed degradable fibers in a fracturing liquid base solution; pumping into a fracturing blender truck, and mixing with a propping agent for fracturing so as to form sand-carrying fluid; then pumping the sand-carrying fluid dissolved with the fibers into a strata so as to support a formed fracture geometry. When the degradable fibers added into the fracturing liquid are uniformly dispersed in the fracturing liquid, the fibers and a guanidine gum chain with a network structure form a tangled structure, so that the strength of the cross-linked network structure is enhanced, the sedimentation rate of the propping agent is reduced, the sand-carrying capacity of the fracturing liquid is improved, the propping agent is uniformly distributed in a whole crack, a supporting effect is fully realized, the crack is prevented from being closed and thus the fracturing period of validity is increased; furthermore, the added fibers are capable of effectively preventing the propping agent from flowing back and preventing formation sand flow; an oil gas flow passage is additionally increased, so that the fracturing yield-increasing effect is finally realized.

Description

technical field [0001] The invention relates to a fracturing method for improving the sand-carrying performance of fracturing fluid, and belongs to the technical field of hydraulic fracturing for oil and gas field development. Background technique [0002] Hydraulic fracturing is an important technical measure for increasing production of oil and gas wells and increasing injection of water injection wells, and plays an important role in enhancing oil recovery and improving water injection conditions. The performance of fracturing fluid is the most critical factor for the success of fracturing construction. At present, the hydraulic fracturing operation includes two stages of liquid injection: the first stage injects pre-fluid, which does not contain proppant or contains fine sand or powder pottery with a particle size of 100 mesh and a sand ratio of about 4-10%. The flow and pressure are pumped in, fracturing the formation and creating fractures, which play the role of frac...

AI Technical Summary

Problems solved by technology

However, this method provides a fracturing process that can effectively improve the fracture support conductivity and oil-gas seepage capacity of oil and gas wells, rather than a fracturing process that is dedicated to improving the sand-carrying performance of the fracturing fluid; in addition, if the method wants to Dispersing the sand-carrying liquid into agglomerates through fibers must have high or special requirements for the configuration of the sand-carrying liquid, which is not conducive to large-scale promotion; moreover, it is difficult to ensure that the non-degradable fibers used in the reservoir Under the complex environment and long-term production process, the performance does not change, so the expected long-term production increase effect cannot be achieved.

[0006] In the existing individual fiber fracturing construction process, due to the lack of fiber synchronous dispersing and conveying devices, fiber materials can only be manually added to the fracturing base fluid, which is not only laborious but also difficult to accurately control the fiber dosage and uneven fiber dispersion, thus lead to unsatisfactory construction effect

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