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High-temperature resistant secondary cross-linked gel profile control agent and preparation method thereof

A secondary cross-linking and high-temperature-resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced efficiency and oil increase, the need for moving string operations, and limited foam strength, etc. Achieve the effects of reducing filtration loss, little change in strength and stability, and controlling steam absorption

Inactive Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrogen foam profile control has a certain effect in the short term, but limited by the strength of the foam, the effective rate of the measure and the oil increment decrease year by year after repeated profile control
And the use of high-strength particles for profile control requires moving string operations, low production time and high cost

Method used

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  • High-temperature resistant secondary cross-linked gel profile control agent and preparation method thereof
  • High-temperature resistant secondary cross-linked gel profile control agent and preparation method thereof
  • High-temperature resistant secondary cross-linked gel profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, the high-temperature-resistant secondary cross-linked gel profile control agent consists of the following components: 12 kg of partially hydrolyzed polyacrylamide (molecular weight 25 million, degree of hydrolysis 25%), 0.1 kg of chromium acetate (effective solid content > 95%) ), 26kg phenol and hexamethylenetetramine synthetic liquid (the mass ratio of phenol and hexamethylenetetramine in the synthetic liquid is 1:5, relative density 1.04, effective solid content> 90%), 0.3kg resorcinol Phenol (effective solid content > 95%), 10kg of sodium soil (effective solid content > 90%) and 1 cubic meter of water.

[0021] The preparation method of the high-temperature-resistant secondary cross-linked gel profile control agent in this example includes the following steps: adding partially hydrolyzed polyacrylamide into water at a temperature of 55°C and fully dissolving it; then adding chromium acetate, phenol and hexamethylene Synthetic solution of base tetram...

Embodiment 2

[0023] In this embodiment, the high temperature resistant secondary cross-linked gel profile control agent is composed of the following components: 8kg partially hydrolyzed polyacrylamide (molecular weight 25 million, degree of hydrolysis 23%), 0.05kg chromium acetate (effective solid content > 95%) ), 26kg phenol and hexamethylenetetramine synthesis liquid (the mass ratio of phenol and hexamethylenetetramine in the synthesis liquid is 1:5, relative density 1.04, effective solid content > 90%), 0.2kg resorcinol Phenol (effective solid content > 95%), 8 kg of sodium soil (effective solid content > 90%) and 1 cubic meter of water.

[0024] The preparation method of the high-temperature-resistant secondary cross-linked gel profile control agent in this example includes the following steps: adding partially hydrolyzed polyacrylamide into water at a temperature of 50°C and fully dissolving it; then adding chromium acetate, phenol and hexamethylene Synthetic solution of base tetrami...

Embodiment 3

[0026] In this example, the high temperature resistant secondary cross-linked gel profile control agent consists of the following components: 9kg partially hydrolyzed polyacrylamide (molecular weight 25 million, degree of hydrolysis 23%), 0.07kg chromium acetate (effective solid content > 95%) ), 27kg phenol and hexamethylenetetramine synthetic liquid (the mass ratio of phenol and hexamethylenetetramine in the synthetic liquid is 1:5, relative density 1.04, effective solid content > 90%), 0.24kg resorcinol Phenol (effective solid content > 95%), 8.5kg sodium soil (effective solid content > 90%) and 1 cubic meter of water.

[0027] The preparation method of the high-temperature-resistant secondary cross-linked gel profile control agent in this example includes the following steps: adding partially hydrolyzed polyacrylamide into water at a temperature of 50°C and fully dissolving it; then adding chromium acetate, phenol and hexamethylene Synthetic solution of base tetramine, res...

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Abstract

The invention discloses a high-temperature resistant secondary cross-linked gel profile control agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The profile control agent has good gelling property and high plugging strength and can resist high temperature of 150 DEG C, and the gelling strength and the gelling time can be adjusted. The high-temperature resistant secondary cross-linked gel profile control agent is mainly characterized by the secondary composite crosslinking process, that is, a plugging agent reacts with a first crosslinking agent under the ground condition to form flowable gel similar to weak gel so as to reduce filter loss of the plugging agent in oil deposit during the construction process and reduce the risk of blocking a low-permeability oil flow channel by the plugging agent; and a second crosslinking agent has a second crosslinking reaction under the high-temperature condition of an oil layer to form high-strength gel so as to effectively plug a high-permeability steam flowing channel, and accordingly, steam suction is controlled, and the sweep efficiency is improved. Gelling of the high-temperature resistant secondary cross-linked gel profile control agent is characterized in that micromolecules are inserted into organic macromolecular materials HPAM, and micromolecules and macromolecules mutually permeate, so that a gel system easily performs sizing; and meanwhile, temperature resistance, salt resistance, shear resistance and ageing resistance are enhanced, and the system performance can be well played.

Description

technical field [0001] The invention specifically relates to a high-temperature-resistant secondary cross-linked gel profile control agent and a preparation method of the gel profile control agent, belonging to the technical field of oil field chemistry. Background technique [0002] Some heavy oil fields have the characteristics of shallow, thin, thick, and scattered, that is, shallow reservoir burial depth, loose reservoir cementation, high crude oil viscosity, thin oil layer thickness, and serious formation heterogeneity. After the first well pattern development and the second well pattern intensification adjustment in the oilfield development, in the process of heavy oil thermal recovery development, due to the density difference between steam and oil-water in the steam injection technology itself, the steam fingering is serious. The physical properties of the reservoirs all changed greatly. Especially in heterogeneous reservoirs, steam channeling occurs frequently or e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 刘继伟郝立军马道祥冯晓青蔡汉文罗全民李萍白新潮白长琦张红梅徐太宗
Owner CHINA PETROLEUM & CHEM CORP
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