Method for profile control by using polymer at offshore oilfield polymer flooding stratum

A technology for offshore oil fields and polymers, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and production, etc., can solve the problems of strong heterogeneity, high concentration of produced aggregates, and large differences in oil-water mobility, etc. Achieve the effect of improving utilization rate, improving oil recovery and reducing impact

Inactive Publication Date: 2011-04-13
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

However, the Bohai Oilfield has the characteristics of strong heterogeneity, large coefficient of variation, thick oil layers, high viscosity of crude oil, large difference in oil-water mobility, unbalanced fluid production profile and water absorption profile, etc. After long-term polymer injection development, the water cut of oil wells has increased Faster, higher concentration of polymer production, which seriously affects the development effect of polymer flooding in offshore oilfields

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  • Method for profile control by using polymer at offshore oilfield polymer flooding stratum
  • Method for profile control by using polymer at offshore oilfield polymer flooding stratum
  • Method for profile control by using polymer at offshore oilfield polymer flooding stratum

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[0016] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to the following examples. In the present invention, the definitions of percolation surface, prefluid and displacement fluid are respectively as follows: percolation surface refers to the contact surface from the wellbore to the formation; etc.), a liquid injected into the well; displacement fluid refers to the liquid used to replace a certain working fluid (such as profile control agent, water shutoff agent, etc.) into the formation.

[0017] Since the flocculant can pass through the hydroxyl group on the particle surface and the amide group-CONH on the molecular chain of the polymer used in the oilfield polymer flooding process 2 and carboxy-COO - Generate hydrogen bonds and adsorb on the polymer surface. From 100mg·L -1 Associative polymer+1000mg·L -1 Atomic force microscope photographs of flocs formed by flocculants (such as figu...

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Abstract

The invention discloses a method for the profile control by using a polymer at an offshore oilfield polymer flooding stratum, sequentially comprising the following steps of: (1) displacing a polymer used in the offshore oilfield polymer flooding process into a stratum with a distance more than 25 meters to a borehole by pad fluid; (2) injecting the aqueous solution of a flocculating agent into the processed stratum of the offshore oilfield in the step (1) from the borehole to obtain a flocculating constituent; and (3) displacing the flocculating constituent obtained in the step (2) to a stratum with a distance of 3-5 meters to an infiltration surface by displacing liquid so as to finish the profile control. The method can improve the recovery ratio of the offshore oilfield polymer flooding, and reduce the influence of the polymer on the post-processing of the produced liquid at the same time.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development engineering, in particular to a method for profile control using offshore oilfield polymer flooding formation polymer. Background technique [0002] During the "Tenth Five-Year Plan" period, my country carried out field tests of polymer flooding in the Bohai Oilfield, and achieved obvious results. However, the Bohai Oilfield has the characteristics of strong heterogeneity, large coefficient of variation, thick oil layers, high viscosity of crude oil, large difference in oil-water mobility, unbalanced fluid production profile and water absorption profile, etc. After long-term polymer injection development, the water cut of oil wells has increased Faster and higher concentration of polymer production seriously affected the development effect of polymer flooding in offshore oilfields. [0003] According to statistics, in the process of polymer flooding, most of the polymer solu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/588
Inventor 戴彩丽唐恩高杨光由庆赵福麟吕凯
Owner CHINA NAT OFFSHORE OIL CORP
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