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Profile control agent and preparation method thereof

A technology of profile control agent and stabilizer, which is applied in the field of profile control agent and its preparation, can solve the problems of sustainable development of oilfields, weak gel strength, high salinity, etc., achieve good selective water shutoff performance and low cost , Strong cross-linking ability

Inactive Publication Date: 2017-05-10
陕西庆华石油建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literatures in the prior art have reported high-temperature-resistant and high-salinity polymer gel-based water plugging and profile control agents, these water plugging and profile control agents generally have weak gel strength and a short stable period. Difficult to popularize in practical application
Due to the high mineralization of formation water, some oil wells cannot take measures such as water shutoff and profile control, and the production is reduced or even shut down due to high water cut. This has become an urgent problem that plagues the sustainable development of oilfields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 5g of polyacrylamide with a molecular weight of 15 million and 950g of water with a salinity of 131564mg / L to make a solution, stir evenly, and let it stand for 2 hours to fully ripen to form a polymer solution, and add 3g of compound polyacrylamide to the polymer solution while stirring The coupling agent and 1g stabilizer are dissolved to form a transition solution, and then 40g of inorganic particle inducer is added to the transition solution to form a mixed solution, and the above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / inorganic composite Gel is the profile control agent. Observe the gelation situation, and use the SNB-214 digital display viscometer to measure the viscosity of the gel at 105°C to be 124810mPa.s. The same formula was placed in an aging kettle at a constant temperature of 100°C for 11 months, and the gel had no obvious dehydration phenomenon, and the viscosity could still reach 87593mPa...

Embodiment 2

[0030] Mix 10g of polyacrylamide with a molecular weight of 15 million and 965.6g of water with a salinity of 131564mg / L to make a solution, stir evenly, and let it stand for 2 hours to fully mature to form a polymer solution, and add 1g of compound to the polymer solution while stirring Cross-linking agent and 3g stabilizer, to be dissolved to form a transition solution, and then add 20g inorganic particle inducer to the transition solution to form a mixed solution, the above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / inorganic The composite gel is the profile control agent. Observe the gelation situation, and use the SNB-214 digital display viscometer to measure the viscosity of the gel at 105°C to be 144352mPa.s. The same formulation experiment was placed in an aging kettle at a constant temperature of 100°C for 11 months, and the gel did not have obvious dehydration phenomenon, and the viscosity could still reach 10...

Embodiment 3

[0036] Mix 8g of polyacrylamide with a molecular weight of 15 million and 956.7g of water with a salinity of 131564mg / L to form a solution, stir evenly, leave it for 2 hours to fully mature to form a polymer solution, and add 2.5g to the polymer solution while stirring Composite cross-linking agent and 2g stabilizer, to be dissolved to form a transition solution, then add 30g inorganic particle inducer to the transition solution to form a mixed solution, the above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / Inorganic composite gel is the profile control agent. Observe the gelation situation, and use the SNB-214 digital display viscometer to measure the viscosity of the gel at 105°C to be 184397mPa.s. The same formula was placed in an aging kettle at a constant temperature of 100°C for 11 months, and the gel had no obvious dehydration phenomenon, and the viscosity could still reach 18496mPa.s.

[0037] Composite cross-l...

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Abstract

The invention relates to a profile control agent and a preparation method thereof. The profile control agent is prepared from 0.5% to 1.0% of polyacrylamide, 0.1% to 0.3% of a compound cross-linking agent, 0.1% to 0.3% of a stabilizer, 2% to 4% of an inorganic particle inductive agent, 0.04% to 0.1% of a deoxidant and the balance of water with the degree of mineralization of smaller than or equal to 15000 mg / L, wherein the used compound cross-linking agent is prepared from 0.8% of resorcinol, 7% of isopropanol, 0.4% of sulfamic acid, 0.7% of hexamine and the balance of water; the stabilizer is hydroquinone; the inorganic particle inductive agent is sodium carbonate; and the deoxidant is thiourea. The profile control agent disclosed by the invention has the characteristics of high cross-linking capacity, long-term stability, high temperature resistance, high salinity, low cost, environmental protection and the like, so that the profile control agent has great application potential.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, in particular to a profile control agent and a preparation method thereof. Background technique [0002] In the process of oilfield water injection development, due to the heterogeneity of the formation, the channeling and bypassing of the injected water is serious, and the injected water often flows along the high permeability layer and does not reach the oil-bearing low permeability layer, so that the water content of the oil well output fluid is sharp. rise, water flooding swept volume and recovery factor decrease. In view of the above problems, the profile control technology of adjusting the water absorption profile of the injection well and preventing the channeling and circumventing of injected water has been widely valued and developed in oilfield development. [0003] With the continuous deepening of oilfield exploitation, conventional water plugging profile control agents c...

Claims

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Application Information

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IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 杨杰雷鹏涛
Owner 陕西庆华石油建设有限公司
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