Method for exploiting residual crude oil in low-permeability oilfield by using polymer micro/nanoparticle

A polymer particle, nano-micron technology, applied in the direction of mining fluids, drilling compositions, chemical instruments and methods, etc., can solve difficult large-scale mining effects, insufficient low-permeability supply capacity, short effective mining time, etc. problems, to achieve the effects of strong oil washing ability, enhanced oil recovery, and strong expansion of the swept volume

Active Publication Date: 2012-11-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are still difficult to produce large-scale mining effects. The development of horizontal wells often fails to achieve the

Method used

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  • Method for exploiting residual crude oil in low-permeability oilfield by using polymer micro/nanoparticle
  • Method for exploiting residual crude oil in low-permeability oilfield by using polymer micro/nanoparticle
  • Method for exploiting residual crude oil in low-permeability oilfield by using polymer micro/nanoparticle

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0034] Example 1:

[0035] The South 2 and 3 areas of the No. 2 Oil Production Plant of Daqing are located at the southern end of the Sartu anticline structure. The dip angle of the strata is steeper at 10° in the west and 3.5° in the east; the depositional environment of the Gaotaizi oil layer in the South 2 and 3 areas is mainly It is a delta outer front facies deposit. The lithology is mainly fine sandstone, fine siltstone and argillaceous siltstone, with a small amount of Imonite mixed layer, not strong expansion, and high chlorite content. The lithology of the inner layer is mainly fine and siltstone, with an average air permeability of 22.5mD, an average porosity of 27.12%, and an average original oil saturation of 62.37%.

[0036] According to the well selection principles and standards, the wells in the Gaotaizi oil zone of the South 2nd and 3rd areas were analyzed. The profile control well group consists of Gao 163-47, Gao 163-49, Gao 164-49, Gao 165-49, and Gao 165. -51,...

Example Embodiment

[0052] Example 1:

[0053] Take 1 mol of acrylamide and 10 mol of acrylic acid and add them to the single-neck round bottom flask 1 (reaction vessel). Add 35.6 mol of acetonitrile solvent to the bottle, mix well, and after ultrasonic dispersion, add 0.1 mol of NN to the round bottom flask Methylene bisacrylamide (MBAA), add 0.02mol of azobisisobutyronitrile (AIBN) and also ultrasonically disperse; (2) The round bottom flask with reaction liquid 2 is placed in the oil bath (heating device 6) At a certain angle, for example, install the condensate return pipe 3, condensate connector 4 and receiving container 5 at 30°; (3) The oil bath starts to heat up, and rises from normal temperature to boiling state within 15 minutes. Keep it at about 90°C for 15 minutes; (4) Adjust the temperature of the oil bath to 110°C, increase the distillation intensity, and the solvent in the flask will continuously flow into the receiving container. After about 90 minutes, the solvent in the flask Almo...

Example Embodiment

[0054] Example 2:

[0055] Take 10 mol of acrylamide and 1 mol of 2-acrylamido-methyl propane sulfonic acid (AMPS) into a single-necked round bottom flask. Add 173 mol of acetonitrile solvent to the flask. After mixing well, disperse ultrasonically and turn to round bottom. 0.1 mol of divinylbenzene was added to the flask, and 0.05 mol of azobisisoheptanonitrile was added to also ultrasonically disperse; (2) The round-bottomed flask containing the reaction liquid was placed in an oil bath (heating device), down Tilt a certain angle, for example, install the condensate return pipe, condensate connector and receiving container at 30°; (3) The oil bath will start to heat up, and it will rise from room temperature to boiling within 18 minutes. Keep the temperature of the oil bath at about 90°C. This state is 15 minutes; (4) Adjust the temperature of the oil bath to 120°C to increase the distillation intensity. The solvent in the flask continuously flows into the receiving container. ...

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Abstract

The invention relates to a method for exploiting residual crude oil in a low-permeability oilfield by using a polymer micro/nanoparticle, comprising the following steps of: (1) carrying out prior period water drive on the low-permeability oilfield; (2) measuring the average throat radius of the low-permeability oilfield to determine the particle size r of the polymer micro/nanoparticle, wherein the particle size r of the polymer micro/nanoparticle meets a formula shown as the specification; (3) carrying out copolymerization by using a distillation-precipitation method according to the determined particle size r of the polymer micro/nanoparticle to obtain the polymer micro/nanoparticle; and (4) injecting the polymer micro/nanoparticle obtained in the step (3) into an oil layer, and carrying out the following water drive on the low-permeability oilfield. The method has the advantages that the used polymer micro/nanoparticle injection system can selectively enter large, medium and small ducts, a stronger wave and volume expanding function and an oil washing capacity are achieved, the residual oil on a low-permeability layer is better exploited, the crude oil exploiting yield is increased, and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the field of oil recovery in oil fields, and relates to tertiary oil recovery technology in oil fields, in particular to a method for exploiting remaining crude oil in low-permeability oil fields by using nano-micrometer polymer particles. Background technique [0002] At present, many oil fields in China are in the stage of high water cut and high recovery degree, low comprehensive recovery rate, low production of many wells. In the 1980s, my country developed chemical flooding tertiary oil recovery technology. Tertiary oil recovery is compared with primary oil recovery and secondary oil recovery. In the early stage of oil exploitation, the oil recovery is only using the natural energy of the formation as primary oil recovery, and the recovery rate is only about 10%. Reaching about 25% to 40%; tertiary oil recovery is to use physical, chemical and biological means to continue to exploit the remaining underground oil. [000...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B43/22C09K8/588
Inventor 朱维耀韩大匡蔡强龙运前张雪玲于明旭
Owner UNIV OF SCI & TECH BEIJING
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