Water-control fracturing yield increasing method for oil gas well

A technology for water fracturing and oil and gas wells, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve the problem of not being able to effectively avoid water flooding of oil wells, slow settling speed of diverting agents or temporary plugging agents, and inability to Effectively prevent problems such as bottom water coning into the wellbore and achieve the effect of preventing water flooding

Active Publication Date: 2009-07-08
QINGYANG CHANGQING DOWN HOLE OILFIELD AUXILIARIESCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, both domestic and foreign technologies have the following shortcomings: 1. The artificial barrier has a certain degree of permeability, which cannot effectively prevent the bottom water from coning into the wellbore, and cannot effectively avoid the problem of oil well flooding; 2. Carry diverting agent or temporary plugging agent The fracturing fluid basically does not reduce viscosity when it meets water, so the diversion agent or temporary plugging agent carried by it settles slowly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. After heating and melting 200Kg50# paraffin in the coating machine, add 1800Kg of quartz sand to the melted paraffin and cool down, and form a coating proppant in the coating machine;

[0043] 2. Add 9817Kg of water into the container with pump circulation or agitator, then turn on the pump circulation or agitator, slowly add 35Kg of low molecular weight thickener, then add 100Kg of clay stabilizer, 10Kg of crude oil demulsifier, 5Kg of surface active agent, 3KgpH regulator, 30Kg bactericide, and then continue to circulate or stir for 30 minutes to make the liquid mix evenly and form a mixed solution;

[0044] 3. Mix the mixed solution and the cross-linking agent again according to the volume ratio of 100:0.7 to form a gel pre-fluid.

[0045] 4. Mix the jelly pre-fluid and the coated proppant according to the weight ratio of 100:30, stir evenly, and pump it into the destination layer.

Embodiment 2

[0047] 1. After heating and melting 200Kg60# paraffin in the coating machine, add 18000Kg of quartz sand to the melted paraffin and cool down, and form a coating proppant in the coating machine;

[0048] 2. Add 9817Kg of water into the container with pump circulation or agitator, then turn on the pump circulation or agitator, slowly add 35Kg of low molecular weight thickener, then add 100Kg of clay stabilizer, 10Kg of crude oil demulsifier, 5Kg of surface active agent, 3KgpH regulator, 30Kg bactericide, and then continue to circulate or stir for 30 minutes to make the liquid mix evenly and form a mixed solution;

[0049] 3. Mix the mixed solution and the cross-linking agent again according to the volume ratio of 100:0.7 to form a gel pre-fluid.

[0050] 4. Mix the gel pre-fluid and the coated proppant according to the weight ratio of 100:30, stir evenly, and pump it into the destination layer

Embodiment 3

[0052] 1. After heating and melting 300Kg70# paraffin in the coating machine, add 1700Kg of quartz sand to the melted paraffin and cool down to form a coating proppant in the coating machine;

[0053] 2. Add 9811Kg of water into the container with pump circulation or agitator, then turn on the pump circulation or agitator, slowly add 40Kg of low molecular weight thickener, then add 100Kg of clay stabilizer, 10Kg of crude oil demulsifier, 5Kg of surface active agent, 4KgpH regulator, 30Kg bactericide, and then continue to circulate or stir for 30 minutes to make the liquid mix evenly and form a mixed solution;

[0054] 3. Mix the mixed solution and the cross-linking agent again according to the volume ratio of 100:0.7 to form a gel pre-fluid.

[0055] 4. Mix the gel pre-fluid and the coated proppant according to the weight ratio of 100:30, stir evenly, and pump it into the destination layer

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PUM

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Abstract

The invention relates to a method for increasing the yield of an oil gas well by controlling water pressing crack, in particular to water control pressing crack technology which takes a jelly glue system capable of automatically reducing the viscosity when encountering bottom water as a pressing crack liquid and wax-coated sand as partial supporting agent. At present, when hydraulic pressing construction is performed on low permeating bottom water oil pool, because the stress difference between layers is small or no interlayer forms the stress difference between the layers, the extending of cracks in the vertical direction can be effectively prevented, cracks formed by the hydraulic pressing crack extend and enter a water layer on the bottom in the vertical direction and jump to flow into a shaft along the cracks, and violent flooding of an oil well is generated. When pressing crack construction is carried out, the method adopts a coated supporting agent formed by mixing a thickening agent and a cross-linking agent carrying wax and quartz sand to undergo chemical degradation to coat and block so as to form a blocking layer. The method effectively solves the problems that the prior manual shielding layer cannot effectively prevent the oil well from being flooded by water, and a pressing crack liquid carrying a diversion agent or a temporary plugging agent cannot reduce viscosity basically when encountering the water and has slower settling.

Description

Technical field: [0001] The invention relates to a water-controlled fracturing stimulation method for oil and gas wells, specifically a water-controlled fracturing technology using a jelly system that automatically reduces viscosity when encountering bottom water as a fracturing fluid and wax-coated sand as a part of the proppant . Background technique: [0002] When performing hydraulic fracturing in low-permeability bottom water reservoirs, due to the small interlayer stress difference or no interlayer at all to form interlayer stress differences, the vertical extension of fractures can be effectively blocked, which will inevitably lead to hydraulic fracturing. The formed fractures extend vertically into the water layer at the bottom, so that after the bottom water reservoir is fractured, the bottom water flows into the wellbore along the fractures, causing violent water flooding of the oil well, which makes the hydraulic fracturing operation ineffective and cannot achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 汪义发杜彪谢璇杨海燕王俊旭苗林万华张青伟程芳曹红燕
Owner QINGYANG CHANGQING DOWN HOLE OILFIELD AUXILIARIESCO
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