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Preparation method of polymer viscosity-reducing profile-control resistance-reducing physical dissolution agent PSR

A physical dissolution and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as oil cannot be recovered, achieve large demand, break through international blockade, and achieve large market effects

Inactive Publication Date: 2016-08-17
CHENGDU NENGSHENGCAI SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymers cause the most damage to the formation by clogging, making oil in small and medium pores unrecoverable

Method used

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  • Preparation method of polymer viscosity-reducing profile-control resistance-reducing physical dissolution agent PSR

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] High-permeability sandstone oilfield water injection well or oil well small-scale reduction of viscosity and resistance physical solvent PSRsa acid fracturing

[0025] Construction Program:

[0026] The first step, 1% PSRsa, dosage 20 ~ 30m 3 , wash the well with reverse circulation, remove the organic and inorganic scale in the wellbore;

[0027] The second step, 3% ~ 5% PSRsa, dosage 50 ~ 100m 3 , Profile adjustment;

[0028] The third step, 1%PSRsa+12%[31%HCl]+2%[40%HF], dosage 300~800m 3 , profile control, polymer viscosity reduction, displacement and resistance reduction;

[0029] The fourth step is to discharge the residual liquid immediately;

[0030] In the fifth step, the water injection well injects water normally, and the oil well produces normally.

[0031] Features: Small-scale profile control improves sweep coefficient, dissolves polymers to remove plugging and reduce viscosity, dissolves fillings, cements and nanopore walls in ultra-low permeability...

example 2

[0033] High-permeability sandstone oilfield water injection well large-scale reduction of viscosity and resistance of physical solvent PSRsa acid fracturing

[0034] Construction Program:

[0035] The first step, 1% PSRsa, dosage 20 ~ 30m 3 , wash the well with reverse circulation, remove the organic and inorganic scale in the wellbore;

[0036] The second step, 3% ~ 5% PSRsa, dosage 50 ~ 100m 3 , Profile adjustment;

[0037] The third step, 0.5%PSRsa+6%[31%HCl]+1%[40%HF], dosage 1000~8000m 3 , profile control, polymer viscosity reduction, displacement and resistance reduction;

[0038] In the fourth step, the water injection well is injected normally.

[0039] Features: Large-scale profile control improves sweep coefficient, dissolves polymers to remove plugging and reduce viscosity, dissolves fillings, cements and nanopore walls in ultra-low-permeability sandstone bedrock nanopores, expands nanopores, improves displacement and drop Resistivity, increase desorption spee...

example 3

[0041] Ultra-low permeability sandstone oilfield water injection well or oil well small-scale reduction of viscosity and resistance physical solvent PSRsa acid fracturing

[0042] Construction Program:

[0043] The first step, 1% PSRsa, dosage 20 ~ 30m 3 , wash the well with reverse circulation, remove the organic and inorganic scale in the wellbore;

[0044]The second step, 1% ~ 3% PSRsa, dosage 50 ~ 100m 3 , fine-tune profile;

[0045] The third step, 0.8% ~ 1% PSRsa + 8% ~ 12% [31% HCl] + 1% ~ 2% [40% HF], the dosage is 300 ~ 800m 3 , profile control, displacement and resistance reduction;

[0046] The fourth step is to discharge the residual liquid immediately;

[0047] In the fifth step, the water injection well injects water normally, and the oil well produces normally.

[0048] Features: Small-scale profile control improves sweep coefficient, dissolves fillings, cements and nano-pore walls in nano-pores and cracks of ultra-low-permeability sandstone rocks, expands...

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Abstract

The invention belongs to the technology of oil field acid fracturing and water injection for recovery rate enhancement. A physical solute of reducing viscosity and resistance PSR has the general principles: the PSR is prepared through optimization of a profile control agent PCA, a polymer physical solute PPS and a rock physical solute RPS, and profile control, the polymer viscosity reduction rate and the displacement resistance-reducing rate are the maximum. The PSR has the characteristics of no oxidizing agent, safety, environmental friendliness, no toxicity, neutral property, no corrosion, no flammable or explosive materials, low molecules, no harm, no impurities, low friction resistance, and no deterioration; the corrosion inhibition rate and the retardance rate of organic acids and inorganic acids are greatly improved, and the acidification is fully effective; the dissolved polymer chain-breaking viscosity-reducing rate is high; fillings and cements in rock pore seams are dissolved, nano pore seams are opened and expanded, and the resistance reduction rate is high; the profile control is good, and the injection pressure is not increased but falls. The PSR is used for high permeability, ultra-low permeability oilfield profile control, polymer viscosity reduction, acid fracturing, water injection and oil driving, improves the polymer depolymerization viscosity reduction rate, improves the displacement resistance-reducing rate, improves the ultralow-permeability rock permeability rate, and increases reservoir, injection and yield.

Description

[0001] Technical field: the invention belongs to oilfield acid fracturing and water injection enhanced oil recovery technology, and in particular provides a method for preparing a physical solvent PSR for polymer viscosity reduction, profile control, drag reduction and physical dissolution. [0002] Note: Dissolution refers to the physical process in which a solute is dispersed in a solvent to become a solution. technical background: [0003] Oil extraction is first of all low-cost oil extraction from oilfields with easy-to-exploit fractures. In the early stage of development, the energy of the oil layer is mainly used to extract oil, which is called primary oil recovery; after the primary oil recovery, the formation pressure continues to drop, and the output drops sharply, and water and gas are injected into the oil layer to supplement energy to the oil layer to extract oil, which is called secondary oil recovery; after water injection development , constantly expanding and c...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/518C09K8/524C09K8/528C09K8/74
CPCC09K8/58C09K8/518C09K8/524C09K8/528C09K8/602C09K8/74
Inventor 冯文光冯博冯妍冯卓
Owner CHENGDU NENGSHENGCAI SCI & TECH DEV CO LTD
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