Energizing re-fracturing process method for old well

A technology of repeated fracturing and process method, applied in the field of oil fracturing, can solve the problems of small displacement, slow formation energy replenishment, and low injection efficiency of water injection wells, so as to compensate for energy exhaustion, increase formation pressure, and improve oil and gas. The effect of production and recovery

Pending Publication Date: 2019-04-16
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, refracturing cannot effectively solve the problem of formation energy depletion; moreover, for oil and gas wells with formation energy depletion, water injection is usually used to replenish formation energy. slow

Method used

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  • Energizing re-fracturing process method for old well
  • Energizing re-fracturing process method for old well
  • Energizing re-fracturing process method for old well

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of energy-enhancing repeated fracturing process method for old wells of the present invention comprises the following steps:

[0022] (1) Run downhole optical fiber: run downhole optical fiber through tubing along the wellbore, and install acoustic wave and temperature sensors to monitor temperature and pressure change signals along the wellbore during fracturing fluid injection, and record bottomhole pressure through downhole pressure gauges;

[0023] (2) Injecting nano-liquid: the nano-liquid is composed of the following components in mass percentage: 5% to 50% of surfactant, 5% to 50% of auxiliary agent, and 5% to 20% of cyclohexane. The displacement injects liquid into the formation to ensure that the injection pressure is lower than the formation splitting pressure, judge the flow direction of the liquid according to the change of temperature and pressure signals, determine the position of the old fracture, and provide a basis for the next construction;

[0...

Embodiment 2

[0033] A kind of energy-enhancing repeated fracturing process method for old wells of the present invention comprises the following steps:

[0034] Step 101, injecting nano-fluid into the formation during the fracturing process; injecting nano-fluid is to enter the existing fractures in the formation, and there is no need to open new fractures. Therefore, the bottom hole pressure should be kept lower than the fracture pressure of the formation during construction ;

[0035] Among them, high-displacement injection can be used when injecting nano-fluid, with a displacement of more than 5 m3 / min. The injection volume of nano-fluid is equal to the cumulative liquid production in the early production process of the oil well, and the general liquid injection volume is 30,000 to 50,000 m3 .

[0036] Step 102, using low-displacement pumping to inject a temporary plugging agent into the formation to seal old fractures in the formation; wherein low-displacement pumping is used to preve...

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Abstract

The invention discloses an energizing re-fracturing process method for an old well. The energizing re-fracturing process method comprises the steps of: injecting nano-liquid into a formation with highdisplacement, and injecting pressure lower than the splitting pressure of the formation; injecting a temporary plugging agent into the formation to plug old cracks in the formation; injecting a fracturing fluid and a proppant into the formation to form a new crack network of the formation, and then carrying out repeated fracturing operations; closing the well after the repeated fracturing operations are completed, and opening the well for production after bottom hole pressure drops. By adopting the method, a large amount of nano liquid is firstly injected into the formation during repeated fracturing, then the original old cracks are plugged, the liquid return rate is reduced, the water storage rate of the formation is improved, then formation energy is supplemented, and the yield is increased.

Description

technical field [0001] The invention belongs to the field of petroleum fracturing, and relates to an energy-enhancing repeated fracturing process for old wells. Background technique [0002] After long-term production of oil and gas wells, formation energy attenuates and formation pressure drops. Tapping the remaining oil potential of old oil fields can effectively improve oil and gas production and improve the economic benefits of old wells. [0003] Refracturing old wells can form new fracture networks in the reservoir, increase the stimulated volume of the reservoir, reduce seepage resistance, and increase oil and gas production. However, refracturing cannot effectively solve the problem of formation energy depletion; moreover, for oil and gas wells with formation energy depletion, water injection is usually used to replenish formation energy. slow. Contents of the invention [0004] The purpose of the present invention is to provide a kind of energy-increasing refra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 姚二冬左洁周福建袁立山李奔梁天博曲鸿雁刘雄飞栾婷婷杨治龙谭艳新
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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