Preparation method of cationic polymer acid solution retarding agent

A cationic polymer and retarder technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult pumping, unstable foam acid, easy rupture, etc. The effect of the slow effect

Inactive Publication Date: 2018-11-23
福州兴创云达新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current retarded acid system still has many disadvantages: thickened acid has a high viscosity and is difficult to pump into low-permeability oil and gas reservoirs; emulsified acid is prone to demulsification under high temperature conditions; foam acid is unstable under high temperature conditions, Easy to break; authigenic acid produces less acid and has higher selectivity to formations

Method used

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  • Preparation method of cationic polymer acid solution retarding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Weigh 0.9 parts by weight of initiator azobisisobutylamidine hydrochloride, dissolve it in 20 parts by weight of deionized water, and set aside; mix 8 parts of methacryloyloxyethyltrimethylammonium chloride, 4 parts of Polyethylene glycol and 180 parts by weight of deionized water are placed in a reaction kettle, and half of the above-mentioned prepared initiator is added and then magnetically stirred for 2 hours to fully dissolve; the solution is heated to 70°C, and 24 parts by weight of Dicyclopentadiene dioxide, 5 parts by weight of hexadecyl dimethyl allyl ammonium chloride, ultrasonic vibration 30min, add the remaining half of the initiator, dropwise within 80min, after mixing evenly, under the action of a magnetic field Purge with argon gas for 1~2h, raise the temperature to 85°C and react at constant temperature for 2h, then lower the temperature to 65~70°C, add 16 parts of nano-silica / cellulose composite materials and continue the heat preservation reaction for 2...

Embodiment 2

[0013] It is exactly the same as Example 1, except that 10 parts of methacryloyloxyethyltrimethylammonium chloride and 20 parts by weight of dicyclopentadiene dioxide are added.

Embodiment 3

[0015] It is exactly the same as Example 1, except that 7 parts of methacryloyloxyethyltrimethylammonium chloride and 28 parts by weight of dicyclopentadiene dioxide are added.

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Abstract

The invention discloses a preparation method of a cationic polymer acid solution retarding agent. Methacryloyloxyethyl trimethyl ammonium chloride, allyl polyethylene glycol and hexadecyl dimethyl allyl ammonium chloride are used as raw materials, a nano silicon dioxide/cellulose composite material is introduced to prepare the cationic polymer acid solution retarding agent by virtue of a water solution polymerization, ultrasonic treatment and physical compounding method. The acid solution retarding agent prepared in the invention has good effect for lowering the reaction rate of acidic rock, and still has good retarding effect under the condition of 90 DEG C and 5000 mg/l NaCl.

Description

technical field [0001] The invention belongs to the field of preparation of oilfield chemical additives, in particular to a cationic polymer acid retarder. Background technique [0002] Acidizing is one of the important measures for increasing production of oil wells and increasing injection of water wells. Acidizing is generally divided into two types, one is conventional acidizing and the other is fracturing acidizing. The acid liquid squeezed into the oil layer can dredge and expand the seepage channels of oil and water through the chemical dissolution of formation rocks and plugs and the hydraulic action of the acid liquid, and increase the permeability of the formation, so as to achieve the purpose of increasing production of oil wells and increasing injection of water wells. [0003] In the acidizing construction, the conventional acid liquid used, such as hydrochloric acid and earth acid, to acidify the limestone and sandstone formations, due to the fast reaction spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/52C08F232/08C08F220/34C08F226/02C08F216/20
CPCC08F232/08C09K8/52C09K8/74C08F220/34C08F226/02C08F216/20
Inventor 张素兰朱亚飞
Owner 福州兴创云达新材料科技有限公司
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