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Water shut-off and profile control method for oil-water well

A water plugging profile control, oil-water well technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of loss of plugging effect, complicated site reality, and failure to plug, so as to reduce pollution, The effect of large maneuvering space and improving efficiency

Inactive Publication Date: 2017-01-25
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, temporary plugging agents containing gel breaker components are most commonly used to temporarily block formations. Temporary plugging agents can effectively block medium and low permeability layers, but they are not strong enough to form effective plugging in high permeability layers. , before the temporary plugging agent breaks the gel, quickly squeeze the jelly water plugging and profile control agent solution into the high permeability layer. Under the formation temperature, after a period of time, the temporary plugging agent in the medium and low permeability layer will be liquefied into an aqueous solution The plugging effect is lost, and the jelly water plugging and profile control agent solution in the high-permeability layer becomes gel, which becomes a high-strength plugging agent to block the high-permeability layer
However, due to the contradictory properties of the temporary plugging agent and its gel-breaking properties, it is difficult to control, and the actual site is very complicated. The gel breaks when it should not be broken, and the gel does not break when it should be broken.

Method used

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  • Water shut-off and profile control method for oil-water well
  • Water shut-off and profile control method for oil-water well
  • Water shut-off and profile control method for oil-water well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Test well A 32 General situation: The oil layer temperature of the oil well is 60℃, the oil layer pressure is 12.5MPa, and the permeability is 700×10 -3 μm 2 , Formation water salinity 5682mg / L, porosity 32.3%, crude oil viscosity 785mPa·s, oil-water well spacing 200m, oil well daily production volume is 30m 3 / d, daily oil production is 1.2t / d, water content is 96.0%; production horizon is 2 layers, numbered A 1 , A 2 , The thickness of the oil layer is 5m, 4m, and the permeability is 1500×10 -3 μm 2 , 200×10 -3 μm 2 , The liquid production profile test shows that A 1 Layer liquid production is 27m 3 / d, A 2 Layer liquid production is 3m 3 / d, where A 1 The water content of the layer is above 98.2%. Using the method of the present invention to perform on-site application of oil well water shutoff in this well, the specific steps are as follows:

[0026] (1) Injection stage of temporary plugging agent solution

[0027] First, prepare the temporary plugging agent solution at t...

Embodiment 2

[0040] Test well B 21 General situation: the oil layer temperature of the oil well is 76℃, the oil layer pressure is 13.7MPa, and the permeability is 850×10 -3 μm 2 , Formation water salinity is 15685mg / L, porosity is 32.3%, crude oil viscosity is 1568mPa·s, oil-water well spacing is 200m, and oil well’s daily fluid production is 30m 3 / d, daily oil production is 1.5t / d, water content is 95.0%; production horizon is 2 layers, numbered B 1 , B 2 , The thickness of the oil layer is 4m, 6m, and the permeability is 1200×10 -3 μm 2 , 150×10 -3 μm 2 , The liquid production profile test shows that B 1 Layer liquid production is 25.0m 3 / d, B 2 Layer liquid production is 5.0m 3 / d, where B 1 The layer contains 99.2% water content. Using the method of the present invention to perform on-site application of oil well water shutoff in this well, the specific steps are as follows:

[0041] (1) Injection stage of temporary plugging agent solution

[0042] First in blocking well B 21 The temporary...

Embodiment 3

[0055] Test injection well C 42 General situation: formation temperature of water well is 50℃, water injection pressure is 5.2MPa, permeability is 850×10 -3 μm 2 , Water injection volume 100m 3 / d; The water injection horizon is 3 layers, numbered C 1 , C 2 , C 3 , The thickness is 5m, 3m, 6m respectively, the water absorption profile test shows that C 1 Layer water absorption is 10m 3 / d, C 2 Layer water absorption is 75m 3 / d, C 3 Layer water absorption is 25m 3 / d, where C 2 The layer water absorption accounted for 75.0% of the total water injection volume. Using the method of the present invention to perform on-site application of water well profile control in this well, the specific steps are as follows:

[0056] (1) Injection stage of temporary plugging agent solution

[0057] First in profile control well C 42 The temporary plugging agent solution is prepared at the well site; secondly, the prepared temporary plugging agent solution is injected into the profile control well C...

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PUM

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Abstract

The invention discloses a water shut-off and profile control method for an oil-water well, and belongs to the field of water shut-off and profile control technology. The method comprises the steps of injection of temporary plugging agent solution, injection of gelled plugging agent solution and injection of oxidized gel-breaking agent solution. The water shut-off and profile control method for the oil-water well has the advantages of being simple in process, strong in operability, good in field test effect, safe and reliable and the like, the water shut-off and profile control effect is greatly improved, the pollution of the gelled plugging agent is reduced. Accordingly, the water shut-off and profile control method for the oil-water well can be widely applied to the field of the oil deposit water shut-off and profile control technology.

Description

Technical field [0001] The invention belongs to the technical field of water plugging and profile control, and specifically relates to a method for water plugging and profile control of oil and water wells. Background technique [0002] At present, some old sandstone reservoirs in eastern my country have water content of more than 90%. High water cut has brought many hazards to the development and production of oilfields, forcing oilfields to adopt technologies such as oil well water shutoff or water injection well profile control to reduce water and increase oil or control water to stabilize oil. In water plugging or profile control operations, among many plugging agents, the most commonly used is the gel plugging agent. The gel plugging agent mainly includes chromium jelly and phenolic jelly. The plugging agent solution is injected by the general injection method. In the formation, it is difficult to ensure that the plugging agent selectively enters the high permeability layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/22
CPCE21B33/13E21B43/16
Inventor 赵世芬
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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