Formula for improving recovery ratio of authigenic CO2

A technology of recovery factor and formulation, which is applied in the formulation field of self-generated CO2 enhanced recovery factor, can solve the problems of corrosion of oil wells and equipment, single function, gas production rate affected by formation pressure, etc., and achieves convenient transportation, wide application range, The effect of overcoming source and transport restrictions

Inactive Publication Date: 2014-04-09
SUNCOO PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the existing autogenous CO 2 The technology is mainly prepared from calcium carbonate oil sludge, hydrochloric acid or urea and ammonium carbamate. Both hydrochloric acid and ammonium carbamate are strong corrosive agents, which are corrosive to oil wells and equipment, and the gas production is affected by formation pressure; single function, Need to add other additives to get more functions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] One for self-generated CO 2 The formula for enhancing oil recovery, its components include, by mass parts: 5 parts of ammonium bicarbonate, 2 parts of sodium lauryl sulfate, and 93 parts of water at 30°C.

[0019] The preparation volume is 200m 3 . Directly injected into the formation, the formation temperature is 50°C, and 7m 3 CO 2 . On the premise of reducing equipment costs, a good production increase effect has been achieved, and the water content of crude oil has also been reduced.

Embodiment 2

[0021] One for self-generated CO 2 The formula for enhancing oil recovery comprises the following components in parts by mass: 10 parts of ammonium bicarbonate, 2 parts of lauryl amidopropyl betaine, and 88 parts of water at 25°C.

[0022] The preparation volume is 300m 3 , directly injected into the formation, the formation temperature is 60°C, and 24m 3 CO 2 . On the premise of reducing equipment costs, a good production increase effect has been achieved, and the water content of crude oil has also been reduced.

Embodiment 3

[0024] One for self-generated CO 2 The formula for enhancing oil recovery comprises the following components in parts by mass: 10 parts of ammonium bicarbonate, 5 parts of cocamidopropyl betaine, and 85 parts of water at 25°C.

[0025] The preparation volume is 100m 3 . Directly injected into the formation, the formation temperature is 60°C, and 7m 3 CO 2 . On the premise of reducing equipment costs, a good production increase effect has been achieved, and the water content of crude oil has also been reduced.

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PUM

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Abstract

A formula for improving the recovery ratio of authigenic CO2 comprises, by mass, 5-15 parts of ammonium bicarbonate, 1-5 parts of bioactive agents, and the balance water which is not beyond 35 DEG C. In use, the formula is directly injected in the stratum and dissolved to generate CO2 through heat of the stratum; when the temperature of the stratum is below 35 DEG C, the CO2 is obtained through composite effect of the heat of the stratum and the bioactive agents. The formula can be applied to the fields of oil field oil displacement, fracturing and well repair, and achieves the purposes of improving the recovery ratio, and promoting fracturing fluid flowing-back. Foams are generated while gas is formed, stability of the foams is high, gas channeling can be effectively prevented, and the formula has the advantages of foam displacement of reservoir oil and foam well killing.

Description

technical field [0001] The invention relates to a formula for oil displacement, viscosity reduction, fracturing fluid drainage, and workover, in particular to a formula for self-generated CO 2 Recipe for enhanced recovery. technical background [0002] As early as the beginning of the 20th century, in order to maintain reservoir pressure and increase production capacity, especially for those ultra-low permeability reservoirs, people put forward the suggestion of using gas injection method to improve oilfield development effect, and gradually matured in the future development. Especially gas injection miscible and immiscible flooding technology has become one of the most effective methods in the production of low permeability reservoirs and heavy oil reservoirs. This technology can increase the oil recovery rate by 10% to 15%, or even higher. CO 2 The main advantage in oilfield development and production is that it can adapt to a wide range of geological conditions and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 盖海防盖欣然王瑞琪
Owner SUNCOO PETROLEUM TECH
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