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An intelligent water-seeking water shutoff agent for high-temperature horizontal wells

A technology for horizontal wells and water plugging agents, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of small rotational freedom of chain links, high density of benzene rings, easy breakage, etc., and achieves application process safety, The effect of high selectivity and high transaction intensity

Active Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the existing problems are: 1. The resin prepolymer is sensitive to "acid, alkali and salt": under alkaline conditions, the prepolymer is stable and does not cure
2. Phenolic resin has a benzene ring clip methylene structure. The benzene ring density is too large, the steric hindrance is large, the chain link has a small degree of freedom of rotation, the force is easily broken, and the water impact resistance is poor.

Method used

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  • An intelligent water-seeking water shutoff agent for high-temperature horizontal wells
  • An intelligent water-seeking water shutoff agent for high-temperature horizontal wells
  • An intelligent water-seeking water shutoff agent for high-temperature horizontal wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a kind of resole phenolic prepolymer, and it is prepared through the following steps:

[0056] Add 15g of sodium hydroxide and 60g of phenol into a 500mL three-neck flask equipped with a thermometer, a reflux condenser, and magnetic stirring, and add 140g of formaldehyde solution with a mass fraction of 33%-37% while stirring continuously;

[0057] React at 45°C-95°C for 4 hours to obtain a resole phenolic prepolymer solution;

[0058] Cool the resole phenolic prepolymer solution of this embodiment and store it in a refrigerator. FTIR, V / cm -1 : 3362, 1478 (characteristic peak), 1054 (V CH2-O-CH2 ), 751 (V C-CH2 o), 879 (V C-CH2 right).

Embodiment 2

[0060] This embodiment provides a kind of melamine formaldehyde prepolymer, and it is prepared through the following steps:

[0061] Add 60g of formaldehyde into a 250mL three-neck flask equipped with a thermometer, reflux condenser, and magnetic stirring, adjust the pH value to weak alkaline with a dilute sodium hydroxide solution, add 26g of melamine, heat in a water bath while stirring, and heat up after the melamine is completely dissolved. to 50°C-80°C, adjust the pH value with dilute hydrochloric acid and washing lye, and react for 2-4 hours to obtain a melamine formaldehyde prepolymer solution.

[0062] Store the above-mentioned melamine-formaldehyde prepolymer solution of this embodiment at room temperature. FTIR, V / cm -1 : 1560,1450 (V C＝N ), 1050 (V C-O-C methylol etherification), 1010 (hydroxymethyl characteristic peak).

Embodiment 3

[0064] This embodiment provides a pyrolysis type curing agent, which is prepared through the following steps:

[0065] Add 25g of neopentyl glycol and 70ml of chloroform into a 250mL four-neck flask equipped with a thermometer, reflux condenser, magnetic stirring, and tail gas absorption device, and slowly add 30mL of phosphorus oxychloride dropwise at room temperature. to 65°C, react for 5h, until no HCl gas is released, distill off the chloroform and excess phosphorus oxychloride to obtain a white solid, the intermediate 5,5-dimethyl-1,3-dioxaphosphorinine Alkylphosphoryl chloride, yield 83.5%.

[0066] Add chloroform and intermediates to the three-necked flask, add water dropwise at room temperature, and control the reaction temperature at 50°C until the reaction temperature does not change with the addition of water, indicating that the hydrolysis reaction is fully completed, separate the chloroform, and neutralize the aqueous phase with sodium hydroxide. Distillation und...

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Abstract

The invention provides an intelligent water exploration type plugging agent for a high temperature horizontal well. Raw materials of the intelligent water exploration type plugging agent for a high temperature horizontal well comprise liquid resin, a filler and the balance water. Raw materials of the liquid resin comprise A-stage phenolic prepolymer, melamino-formaldehyde prepolymer and a pyrolysis curing agent. Raw materials of the filler comprise white clay and ultrafine calcium carbonate. Without cooperation of water exploration or water plugging technology, the plugging agent of the invention can be generally injected into a high permeability layer and is slowly gelatinized at the formation temperature of 80 DEG C and above. The formed gel can bear formation pressure difference, flow thrust and suction force applied on the plugging agent by the negative pressure operation of a near-wellbore area for a long time, has little pollution to oil reservoir, shaft and environment, and is general, efficient, low-cost and safe.

Description

technical field [0001] The invention relates to an "intelligent water-seeking type" water shutoff agent for high-temperature horizontal wells with the ability to protect oil reservoirs, and belongs to the technical field of oilfield exploitation. Background technique [0002] With the advancement of drilling technology and the continuous reduction of cost budget, horizontal well technology as a conventional drilling technology is widely used in Tarim, Shengli, Zhongyuan, Huabei and other oilfields. However, horizontal wells are easier to produce water than conventional vertical wells, and partial water breakthrough in the reservoir will cause a sharp drop in production and even loss of reserves. Therefore, the water production problem seriously affects the oil recovery efficiency and application prospects of horizontal wells. [0003] At present, the mainstream water shutoff agent for oil wells (vertical wells, horizontal wells, etc.) is cement, and polyacrylamide gels and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512
Inventor 刘强朱卓岩欧阳坚
Owner PETROCHINA CO LTD
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