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Reservoir deep fluid diversion chemical agent resistant to high salinity and its preparation method and application

A liquid flow diversion and high salinity technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor thermal stability, poor temperature resistance and salt resistance, and short effective period of deep water control and flooding, etc., to achieve The preparation method is simple and easy, the thermal stability is improved, and the gelation time is controllable

Active Publication Date: 2018-09-04
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 poor temperature and salt resistance of general polymers, difficulty in dissolution, low apparent viscosity of the solution, and poor thermal stability, the effective period of deep control and flooding is short, and the effect of measures is poor.

Method used

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  • Reservoir deep fluid diversion chemical agent resistant to high salinity and its preparation method and application
  • Reservoir deep fluid diversion chemical agent resistant to high salinity and its preparation method and application
  • Reservoir deep fluid diversion chemical agent resistant to high salinity and its preparation method and application

Examples

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Effect test

Embodiment 1

[0033] This embodiment provides a high-salinity resistant deep reservoir liquid flow diversion chemical agent, which is prepared through the following steps:

[0034] Preparation of salt-resistant polymer: at 12°C, add 79.6 parts by weight of deionized water, 15 parts by weight of acrylamide, 3 parts by weight of sodium itaconate, 2 parts by weight of 2-acrylamide- 2-tetradecyl sodium sulfonate, 0.005 parts by weight disodium ethylenediamine tetraacetate, feed nitrogen for 15 minutes, then add 0.1 parts by weight of ammonium persulfate, 0.05 parts by weight of sodium sulfite and 0.2 parts by weight of tetramethylethylene diacetate Amine, continue to feed nitrogen for 5 minutes to seal, wait for the completion of the polymerization reaction to granulate, dry and sieve to obtain a salt-resistant polymer.

[0035] Preparation of high salinity resistant oil reservoir deep liquid flow diversion chemical agent: add 99.1 parts by weight of high salinity salt water (10wt%NaCl+0.7wt%Ca...

Embodiment 2

[0047] This embodiment provides a high-salinity resistant deep reservoir liquid flow diversion chemical agent, which is prepared through the following steps:

[0048] Preparation of salt-resistant polymer: at 12°C, add 77.5 parts by weight of deionized water, 16 parts by weight of acrylamide, 2 parts by weight of sodium itaconate, 4 parts by weight of 2-acrylamide- 2-Tetradecyl sodium sulfonate, 0.005 parts by weight of disodium ethylenediamine tetraacetate, feed nitrogen for 15 minutes, then add 0.15 parts by weight of ammonium persulfate, 0.05 parts by weight of sodium sulfite and 0.25 parts by weight of tetramethylethylene di Amine, continue to feed nitrogen for 5 minutes to seal, wait for the completion of the polymerization reaction to granulate, dry and sieve to obtain a salt-resistant polymer.

[0049] High salinity resistant oil reservoir deep liquid flow diversion chemical agent preparation: add 98.8 parts by weight of high salinity salt water (10wt%NaCl+0.7wt%CaCl 2...

Embodiment 3

[0062] This embodiment provides a high-salinity resistant deep reservoir liquid flow diversion chemical agent, which is prepared through the following steps:

[0063] Preparation of salt-resistant polymer: at 12°C, add 77.4 parts by weight of deionized water, 16 parts by weight of acrylamide, 4 parts by weight of sodium itaconate, 2 parts by weight of 2-acrylamide- 2-tetradecyl sodium sulfonate, 0.005 parts by weight disodium ethylenediamine tetraacetate, feed nitrogen for 15 minutes, then add 0.20 parts by weight of ammonium persulfate, 0.10 parts by weight of sodium sulfite and 0.25 parts by weight of tetramethylethylene diacetate Amine, continue to feed nitrogen for 5 minutes to seal, wait for the completion of the polymerization reaction to granulate, dry and sieve to obtain a salt-resistant polymer.

[0064] High salinity resistant oil reservoir deep liquid flow diversion chemical agent preparation: add 98.9 parts by weight of high salinity salt water (10wt%NaCl+0.7wt%CaC...

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Abstract

The invention provides a high-salinity-resistant reservoir in-depth fluid diversion chemical agent as well as a preparation method and application thereof. The high-salinity-resistant reservoir in-depth fluid diversion chemical agent is prepared from the following raw materials by weight: 0.4-0.6 part of anti-salt polymer, 0.3-0.5 part of a crosslinking agent, 0.2-0.4 part of a stabilizer and the balance of high-salinity water. The high-salinity-resistant reservoir in-depth fluid diversion chemical agent is applied to the profile control and water shutoff during reservoir exploitation. The invention further provides a preparation method of the high-salinity-resistant reservoir in-depth fluid diversion chemical agent. The high-salinity-resistant reservoir in-depth fluid diversion chemical agent is resistant to high salinity, controllable in gelling time and high in gelling viscosity, can achieve the in-depth fluid diversion, and effectively blocks a high permeability layer, to achieve the purpose of blocking the high permeability layer of a high salinity reservoir.

Description

technical field [0001] The invention relates to a liquid flow diversion chemical agent in deep oil reservoir and a preparation method thereof, in particular to a liquid flow diversion chemical agent resistant to high salinity in deep oil reservoir and a preparation method thereof, belonging to the technical field of oil reservoir exploitation. 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. [0003] Deep fluid diversion chemical agent is an important agent in profile control and water shutoff technology. However, the deep fluid diversion chemical agents curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512
CPCC09K8/5083C09K8/512
Inventor 刘平德魏发林熊春明郭子仪张松曾立军
Owner PETROCHINA CO LTD
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