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a water blocking agent

A technology of water blocking agent and brine, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of temperature resistance, salt resistance, low jelly strength, etc., and achieve strong temperature resistance and salt resistance, Good water blocking effect and high gel strength

Active Publication Date: 2016-10-26
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the validity period is short; it is not resistant to temperature and salt, and cannot be used in high-temperature and high-salt reservoirs; when the polyvalent metal ions used in the preparation of polyacrylamide jelly are used as cross-linking agents, the jelly strength is low and cannot meet the requirements. Profile control and water shutoff requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Stir and dissolve 7g of acrylamide, 4g of acrylic acid, 0.005g of N,N'-methylenebisacrylamide, 1.3g of sodium hydroxide, and 0.008g of ammonium persulfate into 60g of brine containing 23% sodium chloride, and slowly raise the temperature to 80°C and keep warm at this temperature. After 4.5 hours, the reaction produces a high-strength gel water blocking agent; the water absorption rate of this water blocking agent is 85g / g.

[0047] Test Conditions:

[0048] Under the conditions of test temperature 27°C, constant frequency f=1Hz, constant stress τ=100Pa, time t=3~5min, the original thickness of the sample is 6mm, and the test gap is 3mm.

[0049] Test Results:

[0050] With the increase of shear time, the storage modulus G' basically remains unchanged, G' fluctuates around 4580Pa, and the dissipation modulus G" is stable in the range of 350-360Pa. Under this condition, the viscoelasticity of the gel does not occur changes, the gel structure was not destroyed.

[0051...

Embodiment 2

[0053] Dissolve 10g of acrylamide, 0.01g of N,N'-methylenebisacrylamide, and 0.008g of azobisisobutyronitrile in 74g of brine containing 21% sodium chloride and 2% calcium chloride, and slowly heat up to 80 ℃, and keep warm at this temperature. After 4.5 hours, the reaction produces a high-strength gel water blocking agent; the water absorption rate of this water blocking agent is 87g / g.

[0054] Test Conditions:

[0055] Under the conditions of test temperature 27°C, constant stress τ=100Pa, scanning time t=3~5min, constant frequency f=1Hz, the sample thickness is 5mm and the gap is 3mm.

[0056] Test Results:

[0057] With the increase of shear time t, the storage modulus G' does not change, G'=12220Pa. The dissipation modulus G" is stable at 336-337Pa. It shows that under this condition, the viscoelasticity of the gel does not change, and the gel structure is not destroyed.

Embodiment 3

[0059] Dissolve 10g of acrylamide, 0.01g of N,N'-methylenebisacrylamide, and 0.008g of azobisisobutyronitrile in 130g of brine containing 21% sodium chloride and 2% calcium chloride, and slowly heat up to 80 ℃, and keep warm at this temperature. After 5 hours, the reaction produces a high-strength gel water blocking agent; the water absorption rate of this water blocking agent is 80g / g.

[0060] Test Conditions:

[0061] Under the conditions of test temperature 27°C, constant frequency f=1Hz, constant stress τ=100Pa, time t=3~5min, the original thickness of the sample is 6mm, and the test gap is 4mm.

[0062] Test Results:

[0063] With the increase of shearing time, the storage modulus G' is basically unchanged, G' fluctuates around 7080Pa, and the dissipation modulus G" is stable in the range of 410-420Pa. It shows that under this condition, the viscoelasticity of the gel is not stable. Changes occurred, the gel structure was not destroyed.

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Abstract

The invention discloses a plugging agent. The plugging agent comprises 6-15wt% of an acrylamide monomer, 0-10wt% of acrylic acid, 0.005-0.03wt% of N,N'-methylene bisacrylamide, 0-0.01wt% of an azo initiator, 0-0.1wt% of ammonium persulfate, 0-2wt% of sodium hydroxide, and the balance brine. The above raw materials are stirred and fully dissolved in brine at room temperature, the obtained mixture is slowly heated to 80DEG C, constant temperature maintenance is carried out at 80DEG C for 4-6h, and a reaction is carried out to generate a gel. The plugging agent can be applied to the technical field of oilfield chemicals, and can polymerize and cross-link during a delayed reaction of stratum to form a gel with a certain strength in order to effectively block a water layer.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals, in particular to a water blocking agent. Background technique [0002] At present, my country's oilfields have fully entered the stage of water flooding development. During the long-term water injection development process, the high-permeability water-absorbing layer and the high water-absorbing direction are washed by the injected water for a long time, and the formation cementation is destroyed to varying degrees, and the formation permeability is further increased. Water channeling along the high permeability layer causes the volume of water flooding and the production of oil well to decrease. The water content of most wells rises rapidly, and the production declines greatly, and some oil wells even cause water flooding to be scrapped; therefore, the profile control and water shutoff technology of oil and water wells are getting more and more attention. As far as water plugging tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C08F220/56C08F220/06C08F222/38
CPCC08F220/56C09K8/5045C09K8/5083C09K8/512C08F220/06C08F222/385
Inventor 王铁林
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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