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A kind of shale polyamine film-forming inhibitor and preparation method thereof

A mud shale and inhibitor technology, applied in the field of mud shale polyamine film-forming inhibitor and its preparation, can solve the problems of high cost and environmental protection, restrictions, etc., and achieve low freezing point, moderate product price and strong adsorption and the inhibitory effect

Active Publication Date: 2016-05-18
CHENGDU BAICHUN PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil-based drilling fluid system is still considered the best system in some highly deviated wells and deep wells that require strong inhibition, but high cost and environmental protection issues limit its application

Method used

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  • A kind of shale polyamine film-forming inhibitor and preparation method thereof
  • A kind of shale polyamine film-forming inhibitor and preparation method thereof
  • A kind of shale polyamine film-forming inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of embodiment 1 shale polyamine film-forming inhibitor

[0030] By optimizing the reactants, reactant ratio and synthesis conditions of a shale polyamine film-forming inhibitor, the optimal plan for the synthesis of the inhibitor is obtained, and the specific steps are as follows:

[0031] (1) The reaction kettle is cleaned and dried, and 38% of amine compounds (polyethylene polyamines) are added;

[0032] (2) Slowly add 62% of epoxy compound (epichlorohydrin), add in three times, and control the temperature of the reactor during the addition process to be no more than 80°C;

[0033] (3) adding a molecular weight regulator (low-molecular linear 1,2-ethyleneamine), the amount added is 0.4% of the total mass of the reactants (polyethylene polyamine and epichlorohydrin);

[0034] (4) Introduce nitrogen protection, heat up to 85 ° C, react for 3 hours, and monitor the change of pH value during the reaction;

[0035] (5) When the pH value reaches 8.5, conti...

Embodiment 2

[0038] The usage method of embodiment 2 mud shale polyamine film-forming inhibitor

[0039] (1) In the drilling process, when encountering muddy shale, add 0.5%~1.0% muddy shale polyamine film-forming inhibitor of the present invention in mud, should be slow when adding, and mix evenly;

[0040] (2) Pretreatment of oil and gas production wells, before putting into production, inject 1.0% to 2.0% of the mud shale polyamine film-forming inhibitor of the present invention to sandstone oil layers with relatively high clay content, and the treatment radius is 2.0m to 5.0m , the purpose of prolonging the production cycle of oil and gas wells;

[0041] (3) In the water injection wells of oil and gas reservoirs with relatively high clay content or relatively high water injection pressure, intermittently inject 0.1% to 0.5% of the mud shale polyamine film-forming inhibitor of the present invention to achieve increased injection and reduced water injection the effect of pressure;

[0...

Embodiment 3

[0043] Embodiment 3 Mud shale anti-expansion performance evaluation test of shale polyamine film-forming inhibitor

[0044] (1) Centrifuge tube method to evaluate the anti-swelling effect of shale polyamine film-forming inhibitor (prepared in Example 1) at normal temperature and pressure. See Table 1.

[0045] Table 1 Anti-swelling effect of shale polyamine film-forming inhibitors at normal temperature and pressure

[0046]

[0047]

[0048] (2) The comparison results of the anti-expansion test of drilling filtrate measured by high-temperature and high-pressure dilatometer are shown in Table 2.

[0049] Table 2 Comparison of shale expansion performance test results

[0050]

[0051] The results show that at room temperature and high temperature, the anti-swelling effect of the shale polyamine film-forming inhibitor (prepared in Example 1) system is significantly better than that of KCl, and it can more effectively inhibit the hydration expansion of formations and cut...

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Abstract

The invention discloses a shale polyamine film formation inhibitor as well as a preparation method thereof, and relates to the field of oilfield chemistry as well as drilling completion fluids. The method disclosed by the invention comprises the following steps: cleaning a reaction kettle clearly and drying, and adding amine compounds; then adding an epoxy compound at a low speed, and controlling the temperature of the reaction kettle not to exceed 80 DEG C; then adding a molecular weight modifier; intruding nitrogen for protection, rising the temperature to 75-85 DEG C, reacting for 2-3 hours, and monitoring the variation of the pH value in the reaction process; rising the temperature continuously to 85-95 DEG C when the pH value is 8-9, and reacting for 1-2 hours; reducing the temperature, and discharging, thereby obtaining a light yellow thick liquid, namely the shale polyamine film formation inhibitor. The inhibitor disclosed by the invention is simple in production technology, is wide in raw material source, is moderate in product price, is less in using amount, is wide in application range, is high in adsorption and shale inhibition, and is long in action time.

Description

technical field [0001] The invention relates to the fields of oilfield chemistry and drilling completion fluid, in particular to a mud shale polyamine film-forming inhibitor and a preparation method thereof. Background technique [0002] With the development of the field of oil and gas exploration, deep wells, ultra-deep wells, ocean wells and wells in unconventional complex areas appear. When encountering mud shale formations during drilling, the hydration expansion and dispersion of mud shale will lead to loss of wellbore walls. A series of problems such as drilling stability, bit balling and wellbore purification have increased the difficulty of drilling and put forward higher requirements for drilling fluid systems, especially shale inhibitors. The oil-based drilling fluid system is still considered the best system in some highly deviated wells and deep wells that require strong inhibition, but high cost and environmental protection problems limit its application. Many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C09K8/035
Inventor 刘通义牛光洲陈光杰谭坤林波魏俊戴秀兰赵众从黄趾海张立丰兰昌文于毅陈江明
Owner CHENGDU BAICHUN PETROLEUM TECH
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