A multi-stage temporary plugging deep network acid fracturing method

Abstract

The invention discloses a multi-stage temporary plugging depth network acid fracturing method, and belongs to the technical field of oil and gas well production increment and improvement. The method comprises the steps that bridge plugging is formed in an artificial fracture through fracture interior temporary plugging material liquid, the artificial fracture is forced to form multiple branch fractures, and main acid is used for etching the fracture; bridge plugging is formed in an artificial fracture opening through fracture opening temporary plugging material liquid, the fracture is forced to be cracked at the new position of a well wall, and interlayer steering is achieved. The multi-stage temporary plugging depth network acid fracturing method has the advantages of being simple in technology, convenient to operate and the like, a complex fracture network is formed in different permeability zones in carbonatite multi-layer, thick-layer or horizontal well long well sections through the principle of combining fluid power self serching and manual control, the oil and gas region communication probability is increased, the oil and gas percolating resistance is reduced, the single-well yield is improved, and a carbonate reservoir is efficiently and economically developed.

Description

technical field [0001] The invention relates to the technical field of oil and gas well stimulation and transformation, in particular to a multi-stage temporary plugging depth network acid fracturing method for increasing the productivity of carbonate rock oil and gas wells, which is used for repeated transformation of old wells and production stimulation of new wells. Background technique [0002] Fracturing and acidizing is one of the important stimulation techniques for carbonate reservoirs. In oil and gas wells with multiple layers, thick layers or long horizontal well sections, due to the large difference in permeability of each layer, the conventional full-well acidizing and fracturing of multiple oil (gas) layers can only stimulate one of the weak layers. Therefore, it is necessary to carry out transformation in layers to ensure the transformation of layers with low permeability. Currently, the techniques used include layered acid fracturing with plugging balls, pack...

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Problems solved by technology

[0004] In order to solve the existing oil and gas well layered acid fracturing problems such as high corrosion resistance requirements, complicated mechanical isolation operation and limited diversion of chemical temporary plugging agents, the present invention provides a multi-stage temporary plugging depth network acid fracturing method, Including: use the temporary plugging material liquid in the fracture to form a bridge plug in the artificial fracture, force the artificial fracture to form multiple branch cracks, and use the main acid to etch the crack; use the temporary plugging material liquid to form a bridge plug in the artificial fracture, Force the fracture to initiate at a new position on the borehole wall to realize interlayer diversion

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