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A low-degree cross-linked polymer flooding system for high-temperature reservoirs

A technology of cross-linking polymer and high-temperature oil, which is applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of good fluidity, enhanced oil recovery, and strong cross-linking reaction ability.

Active Publication Date: 2017-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the reservoir temperature is higher than 80°C, especially when the temperature is above 90°C, the thermo-oxidative degradation effect of the polymer is more obvious, which is also the main reason why domestic chemical flooding technology cannot be applied to reservoirs above 80°C

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  • A low-degree cross-linked polymer flooding system for high-temperature reservoirs
  • A low-degree cross-linked polymer flooding system for high-temperature reservoirs
  • A low-degree cross-linked polymer flooding system for high-temperature reservoirs

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Embodiment Construction

[0016] The following examples only illustrate the present invention in further detail, but do not constitute any limitation to the present invention.

[0017] 1. Embodiment

[0018] Taking the VII1-3 formation in Shuanghe Oilfield as the target reservoir, it is an example of a low-degree cross-linked polymer flooding system in a high-temperature reservoir.

[0019] The basic situation of the target reservoir: the oil-bearing area of ​​Ⅶ1-3 formation in Shuanghe Oilfield is 9.15km 2 , geological reserves 784.0×10 4 t, the reservoir depth is 1996m, the porosity is 18.0%, and the permeability is 0.587μm 2 , the underground crude oil viscosity is 2.3mPa·s, the formation temperature is 93.7℃, and the formation water is NaHCO 3 Type, the salinity is 13087mg / L. The recovery degree is 42.1%, and the comprehensive water content is 98.7%.

[0020] The Ⅶ1-3 layer series of Shuanghe Oilfield belongs to high temperature, high recovery degree and ultra-high water cut reservoir, and the...

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Abstract

The invention discloses a low-crosslinked polymer oil displacement system used for high temperature oil reservoirs, and belongs to the technical field of oilfield exploitation tertiary recovery. The oil displacement system is mainly composed of 800-1800mg / L of partially hydrolyzed polyacrylamide (HPAM) and 30-300mg / L of an organic phenol-aldehyde crosslinking agent, and a concentration ratio of the partially hydrolyzed polyacrylamide to the organic phenol-aldehyde crosslinking agent is greater than 6. The low-crosslinked polymer oil displacement system used for high temperature oil reservoirs has the characteristics of high viscosity, good long-term stability and good injection performance, can be applied in the oil reservoirs with the temperature of 80-95DEG C, and solves a problem that a chemical oil displacement technology cannot be applied in high temperature oil reservoirs; and the oil displacement system has substantial oil increasing and water reducing effects in 93.7DEG C high temperature oil reservoir VII1-3 bed series with the comprehensive water content of 98.7% and the recovery percentage of 42.1%.

Description

technical field [0001] The invention specifically relates to a low-degree cross-linked polymer oil displacement system used in high-temperature oil reservoirs, and belongs to the technical field of oil field development and tertiary oil recovery. Background technique [0002] Chemical flooding technology is an effective technical approach to improve the poor economic benefits of water flooding development in old oilfields in eastern China. Chemical flooding technology has been applied on a large scale in Daqing Oilfield, Shengli Oilfield, Henan Oilfield, etc., and has achieved very obvious effects of increasing oil production and reducing water loss, and the application scale is getting larger and larger. However, when the reservoir temperature is higher than 60 °C, the polymer migrates in the reservoir, and obvious chemical degradation will occur, especially the oxygen in the injected polymer solution can generate free radical oxygen, which makes the polymer produce The fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08J3/24
CPCC09K8/588
Inventor 孔柏岭唐金星刘艳华昌润珍束华东李二晓郭艳
Owner CHINA PETROLEUM & CHEM CORP
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