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Preparation method and application of a high-temperature-resistant and high-salt regulating and displacing agent

A technology of high temperature resistance and control and displacement agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of poor thermal stability, short gel validity period, poor control and displacement effect, etc. The effect of high viscosity

Active Publication Date: 2020-06-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-temperature and high-salt reservoirs, due to the poor heat and salt resistance of general polymers, the apparent viscosity of the polymer solution is low, the thermal stability is poor, the validity period of the gel is short, and the control and displacement effect after the measures are poor.

Method used

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  • Preparation method and application of a high-temperature-resistant and high-salt regulating and displacing agent
  • Preparation method and application of a high-temperature-resistant and high-salt regulating and displacing agent
  • Preparation method and application of a high-temperature-resistant and high-salt regulating and displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example provides a high-temperature-resistant and high-salt medial-displacement agent suitable for high-water-cut oilfields. The raw material components of the high-temperature-resistant and high-salt medial-displacement agent include:

[0031]

[0032]

[0033] Based on the weight of the high-salinity formation water as 100%, the high-salinity formation water includes 10% NaCl, 1% CaCl 2 , 1% MgCl 2 , 0.6% Na 2 SO 4 and the remainder of deionized water.

[0034] The preparation method of the high-temperature-resistant and salt-resistant polymer in this example is as follows: at 12°C, 75.805 parts by weight of deionized water, 20 parts by weight of acrylamide, 2 parts by weight of sodium acrylate, 2 parts by weight of Parts of sodium styrene sulfonate, 0.02 parts by weight of N,N-dioctylacrylamide, nitrogen gas for 15 minutes, then add 0.05 parts by weight of ammonium persulfate, 0.025 parts by weight of sodium sulfite and 0.1 parts by weight of tetramethy...

Embodiment 2

[0047] This example provides a high-temperature-resistant and high-salt medial-displacement agent suitable for high-water-cut oilfields. The raw material components of the high-temperature-resistant and high-salt medial-displacement agent include:

[0048]

[0049] Based on the weight of the high-salinity formation water as 100%, the high-salinity formation water includes 10% NaCl, 1% CaCl 2 , 1% MgCl 2 , 0.6% Na 2 SO 4 and the remainder of deionized water.

[0050] The preparation method of the high-temperature-resistant and salt-resistant polymer in this example is as follows: at 12°C, 74.7 parts by weight of deionized water, 19 parts by weight of acrylamide, 3 parts by weight of sodium acrylate, 3 parts by weight of Part of sodium styrene sulfonate, 0.04 part by weight of N,N-dioctylacrylamide, nitrogen gas was introduced for 15 minutes, then 0.07 part by weight of ammonium persulfate, 0.04 part by weight of sodium sulfite and 0.15 part by weight of tetramethylethylen...

Embodiment 3

[0062] This example provides a high-temperature-resistant and high-salt medial-displacement agent suitable for high-water-cut oilfields. The raw material components of the high-temperature-resistant and high-salt medial-displacement agent include:

[0063]

[0064] Based on the weight of the high-salinity formation water as 100%, the high-salinity formation water includes 10% NaCl, 1% CaCl 2 , 1% MgCl 2 , 0.6% Na 2 SO 4 and the remainder of deionized water.

[0065] The preparation method of the high-temperature-resistant and salt-resistant polymer in this example is as follows: 72.64 parts by weight of deionized water, 20 parts by weight of acrylamide, 3 parts by weight of sodium acrylate, 4 parts by weight of Parts of sodium styrene sulfonate, 0.04 parts by weight of N,N-dioctylacrylamide, nitrogen gas for 15 minutes, then add 0.08 parts by weight of ammonium persulfate, 0.04 parts by weight of sodium sulfite and 0.2 parts by weight of tetramethylethylenediamine, conti...

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Abstract

The invention provides a preparation method and application of the high temperature and high salt resistant profile control and flooding agent. In terms of a total weight of 100 parts, the high temperature and high salt resistant profile control and flooding agent comprises the following raw materials: 0.5-0.6 part of a temperature tolerant and salt resistant polymer, 0.4-0.6 part of a crosslinking agent, 0.3-0.5 part of a stabilizer and the balance highly mineralized formation water. The high temperature and high salt resistant profile control and flooding agent is applicable to deep liquid flow profile controlling and flooding of high water-cut oilfield, can tolerate oil deposit with high mineralization degree of 5.0*10<4>mg / L-15*10<4>mg / L, the gelling time is controllable within 8h-24h, the gelling viscosity is high, under a 120DEG C temperature condition, the gel apparent viscosity reaches 1.0*10<4>mPa.s-2.5*10<4>mPa.s, after successive 3 months of thermal stability investigation, the gel viscosity retention rate reaches 80% or more, therefore the high temperature and high salt resistant profile control and flooding agent can realize deep fluid diversion and effective blocking a high permeability layer, thus reaching the purpose of blocking the high mineralization degree oil deposit high permeability layer.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and relates to a preparation method and application of a high-temperature-resistant and high-salt regulating and displacing agent. Background technique [0002] The single-layer breakthrough of injected water caused by long-term water flooding in water flooding development reservoirs has serious interlayer contradictions and interlayer interference. Profile control and water shutoff technology is an important means to solve the inefficient and ineffective circulation of water injection in water flooding development oilfields, and improve the efficiency of water injection and ultimate recovery. Deep fluid diversion control agent is one of the important components of profile control and water shutoff technology, but the deep fluid diversion control agent currently used in the field is not resistant to high temperature and high salt, and the gel formed has low viscosity, short val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/588E21B43/22E21B33/13
CPCC09K8/512C09K8/588E21B33/13E21B43/16
Inventor 刘平德魏发林吕静张国成张立会张松王龙飞朱秀雨
Owner PETROCHINA CO LTD