Temporary blocking material assisted dragged hydraulic jet reconstruction method for horizontal well

Abstract

The invention provides a temporary blocking material assisted dragged hydraulic jet reconstruction method for a horizontal well. The method comprises the steps of a, carrying out positive swabbing kick-well-off by using a fracturing fluid; b, carrying out positive swabbing kick-well-off by using a sand-carrying fracturing fluid or a sand-carrying acid fluid; c, carrying out positive swabbing kick-well-off by using a fracturing fluid or an acid fluid; d, turning off a gate of a casing pipe; e, injecting the fracturing fluid from an oil pipe to the stratum, and meanwhile injecting clear water into the casing pipe; f, injecting the fracturing fluid or the acid fluid from the oil pipe to the stratum, and injecting clear water into the casing pipe; g, injecting a carrying fluid containing a temporary blocking material to the stratum, and injecting clear way to the casing pipe after a crack is closed; h, injecting the fracturing fluid to the stratum; and i, when further reconstruction is required, dragging the oil pipe to jet, and repeating the operations from the step a to the step h to finish the reconstruction of the horizontal well. According to the method, the formed crack is blocked temporarily by using the temporary blocking material to ensure that the fluid is converged in the current well section, so that the fluid reconstruction efficiency is increased.

Description

technical field [0001] The invention relates to a method for temporarily blocking a diversion material to assist a horizontal well to carry out dragging hydraulic injection reformation, and belongs to the field of oil and gas exploitation. Background technique [0002] Low-permeability oil and gas reservoirs are widely distributed in my country. Due to the low matrix permeability and certain heterogeneity of the reservoirs, the natural production rate is low, and most of them require reservoir reconstruction before they can be put into production. Horizontal well technology is an effective technology for developing such oil and gas reservoirs, but the horizontal well section is long (300-1200 meters), and the conventional general acid fracturing or fracturing stimulation is poorly targeted, and a large amount of liquid is lost to the well with better physical properties. In the interval, it is impossible to form fracture-making communication for multiple favorable intervals ...

AI Technical Summary

Problems solved by technology

After the sand-shooting perforation is completed, due to the short size of fractures formed by hydraulic jetting and the strong heterogeneity of carbonate rock, it is necessary to build long fractures to increase the communication probability, so continue to inject fracturing fluid to expand the fractures formed by jetting, and then Re-inject acid liquid to etch the fractures to form a high conductivity channel; while the liquid tends to enter the channel with the least resistance, the liquid part of the current stimulated well section enters into other artificial fractures formed by injection, resulting in the artificial fracture length of the current injection well section or Acid-etched fractures are short in length, and the efficiency of fluid stimulation in the current well section is low

[0005] At present, there are no effective measures to solve the above problems at home and abroad. In view of the shortcomings of the existing technology, it is necessary to use a special temporary plugging and diverting agent to effectively plug the artificial cracks that have been sprayed before. The second is that the temporary plugging and diverting agent is easy to add in the on-site construction; the third is that the temporary plugging and diverting agent is small in size and can pass through the spray gun freely; the fourth is that the temporary plugging and diverting agent is suitable for higher formations Temperature (20-200°C), it can degrade by itself after construction, so that all cracks can be effective

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