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Preparation method of thickening agent for fracturing fluid with temperature of 200 DEG C or above and the fracturing fluid adopting the thickening agent

A thickening agent and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high friction resistance, poor temperature and salt resistance, secondary damage to the formation, etc., and achieve the residue content. Low, fast dissolving speed, good dispersing performance

Inactive Publication Date: 2019-11-22
北京宝丰春石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current water-based fracturing fluid thickener is mainly a synthetic polymer made of plant guar gum. This type of polymer has poor heat and salt resistance, and basically loses its application value above 180°C, and it is difficult to meet high-temperature oil field fracturing. role requirements
[0004] In addition, guar gum itself has a lot of water-insoluble matter, and a large amount of residue remains after the gel is broken, which is more likely to cause secondary damage to the formation, thereby reducing the permeability of the formation
[0005] The chemical cross-linking speed of guar gum fracturing fluid is fast, and it will form a gel system in a short time, resulting in high friction during pumping, which makes it difficult to meet the construction requirements of high-pressure wells with large displacement

Method used

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  • Preparation method of thickening agent for fracturing fluid with temperature of 200 DEG C or above and the fracturing fluid adopting the thickening agent
  • Preparation method of thickening agent for fracturing fluid with temperature of 200 DEG C or above and the fracturing fluid adopting the thickening agent
  • Preparation method of thickening agent for fracturing fluid with temperature of 200 DEG C or above and the fracturing fluid adopting the thickening agent

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1, a thickener for fracturing fluid above 200°C and its preparation method, comprising the following steps:

[0031] 1. Preparation of polymer thickener powder:

[0032] (1) Preparation of the solution: mix acrylamide (AM), acryloylmorpholine (ACMO), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methyl methacrylate (MMA) and dodecane Sodium phenylbenzenesulfonate is fully mixed in distilled water according to the mass ratio of 7:1:1:1:1, and the total concentration of four monomers (AM, ACMO, AMPS and MMA) in the solution is 45% (molar concentration). The solution;

[0033] Join Na 2 CO 3 As a pH regulator, adjust the pH value to 7, and adjust the temperature of the solution to a constant temperature of 15°C in a water bath.

[0034] (2) Polymerization process: Continuously feed 99.999% high-purity nitrogen at a constant temperature of 15°C, and add the composite initiator system composition after 30 minutes;

[0035] The composition consists of N,N-...

Embodiment 2

[0046] Embodiment 2, a thickener for fracturing fluid above 200°C and its preparation method, comprising the following steps:

[0047] 1. Preparation of polymer thickener powder:

[0048] (1) Solution preparation: acrylamide (AM), acryloylmorpholine (ACMO), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methyl methacrylate (MMA) and dioctylsuccinic acid Sodium is fully mixed in distilled water according to the mass ratio of 12:5:2:1:1, and the total concentration of the four monomers (AM, ACMO, AMPS and MMA) in the solution is 55% (molar concentration);

[0049] Join K 2 CO 3 As a pH regulator, and adjust the pH value to 6.5, the water bath adjusts the temperature of the solution to be constant at 18°C.

[0050] (2) Polymerization process: Continuously feed 99.999% high-purity nitrogen at a constant temperature of 18°C, and add the composite initiator system composition after 60 minutes;

[0051] The composition is composed of N,N,N',N'-tetraethylethylenediamine, sodium...

Embodiment 3

[0058] Embodiment 3, a thickener for fracturing fluid above 200°C and its preparation method, comprising the following steps:

[0059] 1. Preparation of polymer thickener powder:

[0060] (1) Solution preparation: acrylamide (AM), acryloylmorpholine (ACMO), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methyl methacrylate (MMA) and dodecylbenzene Sodium sulfonate is fully mixed in distilled water according to the mass ratio of 15:3:1:1:1 to prepare a solution of four monomers (AM, ACMO, AMPS and MMA) with a total concentration of 40% (molar concentration) in the solution ;

[0061] NaOH was added as a pH regulator, and the pH value was adjusted to 7.5, and the temperature of the solution was adjusted to a constant temperature of 18° C. in a water bath.

[0062] (2) Polymerization process: Continuously feed 99.999% high-purity nitrogen gas at a constant temperature of 18°C, and add a composite initiator system composition after 60 minutes, which consists of N,N-diethyleth...

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Abstract

The invention discloses a preparation method of a thickening agent for a fracturing fluid with the temperature of 200 DEG C or above and the fracturing fluid adopting the thickening agent. The preparation method comprises steps of solution preparation, polymerization and rubber block post-treatment. The fracturing fluid is characterized by being prepared by fully stirring and mixing, by mass, 1% of the thickening agent, 0.5% of a cross-linking agent that is diethylenetriamine, and a pH regulator that is sodium bicarbonate to adjust the pH to 6, with the balance being water for 10 minutes. Beneficial effects are that the thickening agent prepared by the method has the characteristics of fine particles, high-temperature resistance, salt resistance and the like; the fracturing fluid preparedfrom the thickening agent prepared by the method disclosed by the invention has the characteristics of good temperature resistance, shearing resistance, low friction resistance and the like.

Description

technical field [0001] The invention belongs to the field of petroleum development and oil recovery, and in particular relates to a thickener for fracturing fluid above 200°C, a fracturing fluid using the thickener and a preparation method thereof. Background technique [0002] With the advancement of oil and gas exploration technology, the development of oil and gas resources continues to develop in depth, and the number of fractured reservoirs characterized by high temperature and high pressure is increasing day by day. For example, the reservoir temperature of some wells in the peripheral area of ​​Sinopec Tahe Oilfield is as high as 220°C, which poses a very high challenge to the fracturing fluid. [0003] The current water-based fracturing fluid thickener is mainly a synthetic polymer made of plant guar gum. This type of polymer has poor heat and salt resistance, and basically loses its application value above 180°C, and it is difficult to meet high-temperature oil fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/14C08F4/40C09K8/68
CPCC08F4/40C08F220/56C09K8/685C09K8/887
Inventor 潘定奎
Owner 北京宝丰春石油技术有限公司
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