Polyamine strong inhibitor for drilling fluid, and preparation method thereof

A strong suppression and drilling fluid technology, applied in chemical instruments and methods, earthwork drilling, flushing wellbore, etc., can solve the problems of not meeting the environmental protection requirements of drilling engineering, large changes in drilling fluid performance, and inability to maintain the strength of cuttings, etc. Achieve excellent inhibition, reduce reservoir damage, and prevent drill bits from bagging

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inhibitors currently used can only keep the cuttings intact, but cannot maintain the strength of the cuttings; the performance of the drilling fluid changes greatly after being added, the performance is difficult to control, or the biological toxicity is high, which cannot meet the environmental protection requirements of current drilling projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Synthesis of In-House Samples of Novel Potent Polyamine Inhibitors:

[0024] The added amount of the starter polyetheramine is 1004.8g, the added amount of potassium hydroxide is 1g, the added amount of propylene oxide is 200.5g, the stirring speed is less than 150r / min, and the heat transfer oil is heated. Add the initiator polyetheramine and potassium hydroxide first, and then add 15wt% propylene oxide after heating up to 90°C. After raising the temperature to 110°C, the remaining propylene oxide was added several times. After adding propylene oxide for the last time, keep the temperature at about 110°C, and after the pressure drops to zero, keep the temperature at about 120°C to continue the reaction for 1 hour, cool, vacuumize, and discharge.

Embodiment 2

[0026] Industrial Pilot Test of New Polyamine Strong Inhibitors:

[0027] The added amount of the initiator polyetheramine is 588kg, the added amount of potassium hydroxide is 0.6Kg, and the added amount of propylene oxide is 140kg. The reaction kettle was cleaned and dried, and then vacuumized. First, 588Kg of polyetheramine and 0.6Kg of potassium hydroxide were added as starters, and then the temperature was raised. After the temperature rose to 90°C, propylene oxide was added, and 42kg of propylene oxide was added within the temperature range from 90°C to 115°C, and the propylene oxide was added in three times. After the temperature rises to 115°C, add the remaining propylene oxide in portions, ensuring that the pressure does not exceed 0.3MPa during the addition process, and at the same time, the maximum temperature of the kettle body is controlled not to exceed 125°C. After the pressure drops to zero, keep the temperature at about 120°C and continue the reaction for 1 ho...

Embodiment 3

[0029] Industrial production of new polyamine strong inhibitors:

[0030] The addition amount of the initiator polyetheramine is 6045Kg, the addition amount of potassium hydroxide is 6Kg, and the addition amount of propylene oxide is 1206Kg. First add 6045Kg of polyetheramine and 6Kg of potassium hydroxide into the reaction kettle. When the temperature rises to 90°C, 184Kg of propylene oxide is introduced, and then the temperature continues to rise. Oxypropane, divided into seven input. The highest temperature during the reaction was 135°C. The whole reaction process ensures that the pressure does not exceed 0.3MPa. When the pressure in the kettle drops to -0.03MPa and remains constant, it is cooled by circulating water, vacuumized, and then the material is discharged. The color of the product is colorless and transparent, and the viscosity is moderate.

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Abstract

The invention relates to a polyamine strong inhibitor for a drilling fluid. The polyamine strong inhibitor is prepared through the following step that: an amine compound and an epoxy compound are subjected to a reaction at a temperature of 90-110 DEG C in the presence of an alkali metal catalyst to synthesize the polyamine strong inhibitor for the drilling fluid, wherein the amine compound is polyether amine, alkyl amine, ether amine, tetraethylenepentamine, pentaethylenehexamine or polyethylene polyamine, and the epoxy compound is propylene oxide or ethylene oxide. According to the present invention, based on high temperature strong water sensitivity easy-instability stratum, special molecular structure design is adopted, such that the inhibitor has strong inhibition, and mud making of clay and hydration expansion of shale can be inhibited; and the inhibitor provides a stabilization effect for dynamic cutting force when the Xuanhua bentonite addition amount is up to 30%, wherein a debris rolling recovery rate can be more than 90%, a 8 h shale linear expansion rate is less than or equal to 10%, a temperature resistance performance is more than or equal to 180 DEG C, biological toxicity is low, and a LC50 value is more than 38010 mg/L.

Description

technical field [0001] The invention relates to a treatment agent for drilling fluid in the process of petroleum drilling, which is used in drilling fluid construction and belongs to the field of petroleum drilling. technical background [0002] Wellbore instability is a common and often encountered complex problem in oil and gas drilling. Downhole complex accidents caused by well wall instability are extremely harmful to drilling and completion, and have always been a prominent problem in the petroleum engineering circles at home and abroad. During drilling operations, once the wellbore instability occurs, it will not only delay the drilling time, damage oil and gas layers, interfere with geological logging, etc., but also lead to a series of downhole complex situations and accidents such as well collapse and drill sticking. It may even cause the wellbore to be scrapped, resulting in significant economic losses. [0003] The stability of wellbore shale depends on the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C08G65/00E21B21/06
Inventor 张国刘贵传徐江梅春桂刘金华陈红壮高伟
Owner CHINA PETROLEUM & CHEM CORP
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