Oil-gas well fiber assisted water control fracturing method

An oil and gas well and auxiliary control technology, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve problems such as reservoir damage, inability to effectively avoid oil and gas well flooding, unfavorable field operations, etc., to achieve Prevent sand plugging and proppant backflow, reduce water phase permeability, and improve sand-carrying performance

Inactive Publication Date: 2011-05-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technologies all have the following disadvantages: 1. The artificial shielding layer has certain permeability, which cannot effectively prevent the bottom water from coning into the wellbore, and cannot effectively avoid the problem of water flooding of oil and gas wells; The cracking fluid basically does not reduce viscosity when it meets water, so the diversion agent or temporary plugging agent carried by it settles slowly; Crack construction is likely to cause reservoir damage
This patent requires heating to melt paraffin wax or microcrystalline wax, and then cool down in the coating machine to form a coated proppant. This process consumes a lot of energy and is not conducive to on-site operation. Therefore, it is very inconvenient in practical applications

Method used

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  • Oil-gas well fiber assisted water control fracturing method
  • Oil-gas well fiber assisted water control fracturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A fiber-assisted water control fracturing method for oil and gas wells, the steps are as follows:

[0029] (1) Add 10000kg of water to a container with pump circulation or agitator, then turn on the pump circulation, slowly add 20kg of thickener with water control function, then add 100kg of clay stabilizer, 30kg of pH regulator, 30kg of fracturing fluid After the fungicide and 50kg drainage aid, continue to circulate for 30 minutes to fully swell and mix the liquid to form a low-viscosity liquid, which is the fracturing fluid;

[0030] (2) 1 / 2 of the fracturing fluid prepared in step (1) is mixed evenly with 40kg of fibers (fiber monofilament diameter is 10-15 microns and length is 8-12 mm) to obtain the fracturing sand-carrying fluid;

[0031] (3) Mix the fracturing sand-carrying fluid prepared in step (2) with 2000kg of proppant, and stir to form a sand-mixing fluid;

[0032] (4) First pump 1 / 2 of the fracturing fluid prepared in step (1) into the target layer in th...

Embodiment 2

[0035] The fiber-assisted water control fracturing method for oil and gas wells as described in Example 1, the difference is that

[0036] The add-on of the thickening agent in the step (1) is 30kg;

[0037] 2 / 3 of the fracturing fluid in the step (2) is mixed with 60kg of fibers (fiber monofilament diameter is 10-15 micron, length is 8-12 mm);

[0038] The addition amount of the proppant in step (3) is 3000kg.

[0039] According to the standards issued by the Ministry of Petroleum SY / T 6339-1998 "Unsteady State Method for Determination of Relative Permeability of Oil and Gas" and SY / T 5345-1999 "Determination of Relative Permeability of Oil and Water", after actual testing, the water phase permeability can be reduced by 70%. Above, the reduction rate of oil and gas phase permeability is controlled within 15%, and the distance from cracks extending to the edge and bottom water layer is reduced by more than 70%.

Embodiment 3

[0041] The fiber-assisted water control fracturing method for oil and gas wells as described in Example 1, the difference is that

[0042] The add-on of the thickening agent in the step (1) is 40kg;

[0043] 3 / 4 of the fracturing prefluid in step (2) is mixed with fibers (fiber monofilament diameter is 10-15 micron, length is 8-12 mm), and the addition amount of fiber is 80kg;

[0044] The addition amount of the proppant in step (3) is 4000kg.

[0045] According to the standards issued by the Ministry of Petroleum SY / T 6339-1998 "Unsteady State Method for Determination of Relative Permeability of Oil and Gas" and SY / T 5345-1999 "Determination of Relative Permeability of Oil and Water", after actual testing, the water phase permeability can be reduced by more than 80%. , while the reduction rate of the oil and gas phase permeability is controlled within 20%, and the distance from the fracture to the bottom water layer is reduced by more than 60%.

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Abstract

The invention relates to an oil-gas well fiber assisted water control fracturing method, and belongs to the technical field of petroleum extraction. The method comprises the following steps of: (1) adding a thickening agent with water control function into water with stirring, and then adding additive to obtain fracturing prepared fluid; (2) mixing a part of the fracturing prepared fluid preparedin the step (1) and fiber uniformly to obtain fracturing sand-carrying fluid; (3) adding a propping agent into the fracturing sand-carrying fluid prepared in the step (2) to obtain sand mixing fluid;and (4) pumping the rest fracturing prepared fluid prepared in the step (1) into a destination layer in an oil-gas well, and then pumping the sand mixing fluid prepared in the step (3). According to the method, the thickening agent is adopted, so functions of seam forming and sand carrying of the conventional thickening agent are obtained, and the oil (gas) water ratio in the oil-gas layer can bechanged and the permeability of the aqueous phase is greatly reduced.

Description

technical field [0001] The invention relates to a fiber-assisted water-controlling fracturing method for oil and gas wells, in particular to a fiber-assisted water-controlling fracturing method for oil-gas wells near water or high-water content and low-permeability oil-gas reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] It has always been a difficult problem to perform water-controlled fracturing and effectively control water production in near-water and high-water-cut reservoirs. Production wells produce a large amount of water, which usually leads to a rapid decline in oil production and increased energy consumption for oil production. A large amount of water treatment increases production costs, and also causes other problems such as sand production, corrosion, and scaling. The well was forced to shut down early and stop production due to no economic value of exploitation. At present, the proportion of oil and gas f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26C09K8/68
Inventor 罗明良温庆志贾自龙孙厚台刘佳林刘洪见
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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