Multi-stage temporary plugging depth network acid fracturing method
A deep network and acid fracturing technology, which is applied in earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of limited diversion of chemical temporary plugging agents, high requirements for corrosion resistance, and complicated mechanical isolation operations, etc. Achieve the effects of increasing single well production, reducing seepage resistance, and convenient operation
Active Publication Date: 2016-12-07
SOUTHWEST PETROLEUM UNIV +2
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[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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[0031] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.
[0032] See image 3 , The multi-stage temporary plugging deep network acid fracturing method provided by the embodiment of the present invention includes the following steps:
[0033] Step S1: According to the characteristic attributes of the reservoir, the amount and displacement of the pre-acid are set, and the pre-acid is injected into the formation to improve the liquid absorption capacity of the reservoir.
[0034] Reservoir characteristic attributes mainly include reservoir thickness and porosity and permeability characteristics. The dosage and displacement of the pre-acid are set according to the thickness and porosity characteristics of the reservoir. The purpose of injecting the pre-acid is to dredge the reservoir near the well zone, remove pollution and promote formation fluid absorption, which is equivalent to a simple matrix acidificati...
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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 improvement, in particular to a multi-stage temporary plugging depth network acid fracturing method for improving the productivity of carbonate rock oil and gas wells, which is used for repeated improvement of old wells and production improvement of new wells. Background technique [0002] Fracturing acidification is one of the important production stimulation techniques for carbonate reservoirs. In oil and gas wells with multiple layers, thick layers or long sections of horizontal wells, due to the large difference in permeability of each interval, full-well acid fracturing with conventional multiple oil (gas) layers can only modify one of the weak layers. Therefore, it is necessary to reform in layers to ensure that the layers with low permeability are reformed. Currently, the processes used include layered acid fracturing of plugging balls, packer acid fracturing, and layer...
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IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 杨兆中李小刚孙俊唐诗国洪玉奎周长林曾斌敖科刘宇
Owner SOUTHWEST PETROLEUM UNIV
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