Adsorptive acid liquor retarding admixture and preparation method thereof

An admixture, adsorption-type technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced foam acid stability, affected slow acidification effect, and increased acid filtration loss, etc. Good thermal stability, simple and feasible preparation method, and favorable effect of flowback

Active Publication Date: 2013-07-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the advantages of low liquid content, high apparent viscosity, and small fluid loss, which can effectively slow down the reaction rate of acid rock and quickly flow b...

Method used

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  • Adsorptive acid liquor retarding admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 A preparation method of an adsorption-type acid retarding admixture

[0018] First, add 0.747g or 0.002mol of octadecyldimethylallyl ammonium chloride BAZ and 1g or 0.001mol of allyl polyethylene glycol APEG and 2.84g of 0.04mol of acrylamide AM; then add 41.3g of deionized water to the above solution to form a solution with a monomer mass percentage concentration of 10%, stir and dissolve and add 0.018g of initiator azobisisobutylamidine hydrochloride Finally, after mixing the above solutions evenly, react at a temperature of 50°C for 6 hours to obtain a colloidal product, wash with absolute ethanol for 3 times until precipitation occurs, and dry in an oven at a temperature of 50°C for 24 hours to obtain this product Acid retarding admixture.

Embodiment 2

[0019] Example 2 A preparation method of an adsorption-type acid retarding admixture

[0020] First add 0.672g (0.0018mol) of octadecyldimethylallyl ammonium chloride BAZ and 1g (0.001mol) of allyl polyethylene glycol APEG and 2.84g (0.001mol) to a silk-top reagent bottle with a volume of 100mL. 0.04mol of acrylamide AM; then add 40.6g of deionized water to the above solution to form a solution with a monomer mass percentage concentration of 10%, stir and dissolve and add 0.018g of initiator azobisisobutylamidine hydrochloride Finally, after mixing the above solutions evenly, react at a temperature of 50°C for 6 hours to obtain a colloidal product, wash with absolute ethanol for 3 times until precipitation occurs, and dry in an oven at a temperature of 50°C for 24 hours to obtain this product Acid retarding admixture.

Embodiment 3

[0021] Example 3 A preparation method of an adsorption-type acid retarding admixture

[0022] First add 0.672g or 0.0018mol of octadecyldimethylallyl ammonium chloride BAZ and 0.8g or 0.0008mol of allyl polyethylene glycol APEG and 2.84g That is, 0.04mol of acrylamide AM; then add 38g of deionized water to the above solution to form a solution with a monomer mass percentage concentration of 10%, stir and dissolve and add 0.017g of initiator azobisisobutylamidine hydrochloride Finally, after mixing the above solutions evenly, react at a temperature of 50°C for 6 hours to obtain a colloidal product, wash with absolute ethanol for 3 times until precipitation occurs, and dry in an oven at a temperature of 50°C for 24 hours to obtain this product Acid retarding admixture.

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PUM

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Abstract

The invention discloses an adsorptive acid liquor retarding admixture for acidification in oil and gas wells and a preparation method thereof. According to the technical scheme, the acid liquor retarding admixture comprises the following monomers in percentage by mole: 4.2 to 4.7 percent of octadecyl dimethyl allyl ammonium chloride (BAZ) monomer, 1.9 to 2.3 percent of allyl polyethylene glycol (APEG) monomer, 93 to 93.5 percent of acrylic amide (AM) monomer, and 2,2'-azobis(2-methylpropionamide) dihydrochloride (AIBA) serving as an initiator in an amount which is 0.4 to 0.5 percent of the total mass of the monomers. The preparation method comprises the following steps of: adding BAZ, APEG and AM into a reaction container, adding water to prepare a solution of which the monomer concentration is 10 mass percent, adding the initiator, mixing uniformly, reacting for 6 to 7 hours at the temperature of between 50 and 55 DEG C, and thus obtaining the acid liquor retarding admixture. The preparation method is simple and feasible; the reaction conditions are mild; and the acid liquor retarding admixture is high in thermal stability, can be adsorbed to stratum crack walls, can be used for retarding the reaction speed of acid liquor and the crack walls and achieving the effect of deep acidification and is used for preparing acidifying liquor.

Description

technical field [0001] The invention relates to an adsorption-type acid retarding admixture used in the acidizing operation of the petroleum and natural gas industry and a preparation method thereof. Background technique [0002] Acidizing is one of the important production stimulation measures for oil and gas reservoirs. It is a production stimulation measure that uses acid liquid to remove pollution near the bottom of production wells and injection wells, restore formation permeability or dissolve formation rock cement to increase formation permeability. Its purpose is to use acid to relieve the damage caused to the formation near the wellbore during the process of drilling, well completion, well workover and enhanced injection, and dredge the fluid seepage channel, so as to restore and increase the productivity of oil and gas wells. At present, based on the scale of acid-etched fractures, the acid fracturing technology can be divided into two categories: ordinary acid fr...

Claims

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Application Information

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IPC IPC(8): C09K8/74C08F220/56C08F216/20C08F226/02
Inventor 全红平李欢黄志宇张太亮鲁红升明显森郭威
Owner SOUTHWEST PETROLEUM UNIV
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