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Encapsulated sustained-release acid for oil-water well reconstruction and preparation method thereof

A slow-release acid, oil-water well technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short acid treatment radius and poor effect, and achieve high true sphericity, good water solubility, particle size small effect

Active Publication Date: 2013-10-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a capsule slow-release acid for oil-water well transformation and a preparation method thereof, which overcomes the shortcomings of conventional acidification and slow-acid acidification technology that the acid treatment radius is short and the effect is poor. The control method of ion consumption is simple and accurate, which reduces the probability of downhole tools being corroded by acid and the probability of injury to operators. It is safe to transport, easy to carry and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take the following raw materials by weight: (g)

[0035] Solid hydrochloric acid powder 450g, hydroxypropyl guar gum 5g, stearic acid 30g, acrylic resin 15g;

[0036] Preparation:

[0037] Applicable formation temperature of the product: 65-75°C

[0038] (1) Prepare 1000ml binder solution (5g hydroxypropyl guar gum + 1000ml water), let stand for 10min;

[0039] (2) Put 450g of solid hydrochloric acid powder into the side spray fluidized bed; open the side spray fluidized bed, adjust the temperature to 40°C, the fluidized bed speed to 50rpm, the spray flow rate to 20ml / min, and the spray pressure to 0.20MPa , The blast flow rate is 200L / min, and the binder solution is sprayed onto the solid hydrochloric acid powder to form solid hydrochloric acid particles;

[0040] (3) Prepare the wall material solution for the slow-release support layer: dissolve 30 g of stearic acid and 15 g of acrylic resin in 1000 ml of 6 wt % ethanol solution, and let stand for 15 min;

[0041]...

Embodiment 2

[0045] Take the following raw materials by weight: (g)

[0046] Citric acid sieved fine powder 450g, carboxymethyl hydroxypropyl guar gum 5g, pentaerythritol stearate 25g, acrylic resin 20g;

[0047] Applicable formation temperature of the product: 50~60℃

[0048] Preparation:

[0049] (1) Prepare 1000ml binder solution (4g carboxymethyl hydroxypropyl guar gum+1000ml water), let stand for 10min;

[0050](2) citric acid is pulverized, and after crossing a 0.15mm-0.125mm standard sieve, get 450g of sieved fine powder and put it into a side spray fluidized bed;

[0051] (3) Turn on the side spray fluidized bed, adjust the temperature to 40°C, the fluidized bed speed to 50rpm, the spray flow rate to 20ml / min, the jet pressure to 0.20MPa, and the blast flow rate to 200L / min, and the binder solution Spray on citric acid particles to form solid acid particles;

[0052] (4) Preparation of slow release support layer wall material solution: dissolve 20g pentaerythritol stearate, 25g...

Embodiment 3

[0057] Take the following raw materials by weight: (g)

[0058] Solid hydrochloric acid powder 395g, guar gum 8g, polyethylene glycol distearate 25g, polyethylene glycol 23g;

[0059] Applicable formation temperature of the product: 65~75℃

[0060] The preparation method is as in Example 1.

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Abstract

The invention discloses an encapsulated sustained-release acid for oil-water well reconstruction and a preparation method thereof. The encapsulated sustained-release acid comprises a capsule core and a sustained-release supporting layer coated on the outer layer of the capsule core, wherein the capsule core is a soluble or meltable solid acid, the sustained-release supporting layer comprises a sustained-release wall material and a supporting wall material, the sustained-release wall material is an organic fatty acid or a derivative thereof, the supporting wall material is acrylic resin or a derivative thereof, and the solid acid is solid hydrochloric acid powder or citrate. The encapsulated sustained-release acid is a spherical granule with the particle size of 0.15-0.25 mm. The encapsulated sustained-release acid also comprises an adhesive spray-coated on the capsule core, wherein the adhesive is water-soluble vegetable gum or a derivative thereof, and is specifically guar gum, hydroxypropyl guar gum or carboxymethyl hydroxypropyl guar gum. According to the invention, the control mode of the acid radical ion consumption is simple and accurate; the preparation process is simple; and the encapsulated sustained-release acid is reliable in performance, safe for transportation and carrying, and convenient for use, and can be used for reducing the probability of underground tool acid corrosion and operation personnel damage in the application.

Description

technical field [0001] The invention belongs to the field of chemical products for oil and gas field development, and in particular relates to a capsule slow-release acid for oil-water well reconstruction and a preparation method thereof. Background technique [0002] Acidizing is one of the main means of increasing production of oil and gas wells and increasing injection of water wells. The use of acid liquid can remove the pollution near the bottom of production wells and water injection wells, remove the clogging substances in pores or fractures, or communicate the original pores or fractures in the formation to improve Formation permeability, so as to achieve increased production and injection. [0003] Conventional acidification mostly uses various liquid acids. At present, the better acidification method is to use slow acid acidification. Slow acid slows down the consumption of acid radical ions through chemical reaction, prolongs the action time and radius of action...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 刘伟刘建权张洪君吴志俊张子明王疆宁李玉印杜艳
Owner PETROCHINA CO LTD
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