Self-lubrication liquid branched-polymer shear strength improving agent and preparation method thereof and oil-based drilling fluid

A branched polymer, liquid technology, applied in the field of oil-based drilling fluids, can solve problems such as no disclosure of applicability, and achieve the effects of solving rheological adjustment, improving connection degree, and improving structural strength

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cutting agent is made of alkoxylated fatty amine, polyoxyethylene ether diamine and polycarboxylic acid for amidation reaction at room temperature to 200°C; the cutting agent is suitable for aliphatic, aromatic and synthetic drilling fluids , the optimum range of addition is 0.2 to 3%. In one example, after hot rolling at 300°F (149°C), the viscosity and shear of oil-based drilling fluids are kept better, but the applicability of higher temperatures is not disclosed

Method used

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  • Self-lubrication liquid branched-polymer shear strength improving agent and preparation method thereof and oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A1 is adipic acid, molecular formula C 6 h 10 o 4 , the total amount of acidic groups is x=2, and it is solid at room temperature.

[0040] B1 is phenylethanolamine, molecular formula C 8 h 11 NO 2 , the total amount of basic groups is y=3, and it is solid at room temperature.

[0041] Dissolve each of A1 and B1 in DMF (N,N-dimethylformamide) to form a 1mol / L solution.

[0042] Slowly add the above solution containing 1 / 2 mol of A1 to the above solution containing 0.2 mol of B1, control the dropwise temperature in an ice-water bath, and stir for 0.5 hours in an ice-water bath environment, during which the nitrogen atmosphere is maintained after removing air and water vapor with nitrogen; While stirring, the temperature was gradually increased to 120° C., and the first step reaction was carried out for 3 hours.

[0043] Then add the above-mentioned solution containing 0.3mol B1, add 10g KOH at the same time, raise the temperature to 150°C, and carry out the second...

Embodiment 2

[0045] A2 is trimerized linoleic acid, molecular formula C 51 h 93 -(COOH) 3 , the total amount of acidic groups is x=3, and it is liquid at room temperature.

[0046] B2 is ethylenediamine butanol, molecular formula C 10 h 24 N 2 o 2 , the total amount of basic groups is y=4, and it is solid at room temperature. Dissolve B2 in DMF to make a 1mol / L solution.

[0047] Slowly add 1 / 3 mol of A2 to the above solution containing 0.125 mol of B2, control the dropwise temperature in an ice-water bath, and stir for 1 hour in an ice-water bath environment, during which nitrogen atmosphere is maintained after removing air and water vapor through nitrogen. Under stirring, the temperature was gradually raised to 150° C., and the first step reaction was carried out, and the reaction lasted for 4.5 hours.

[0048] Then add the above-mentioned solution containing 0.3mol B2, add 20g NaOH at the same time, lower the temperature to 140°C, and carry out the second step reaction for 3 hou...

Embodiment 3

[0050] A3 is trimellitic anhydride, also known as 1,2,4-benzenetricarboxylic anhydride, molecular formula C 9 h 4 o 5 , the total amount of acidic groups is x=3, and it is solid at room temperature. Dissolve 1 / 3 mol of A3 in N,N-dimethylformamide to make a 1 mol / L solution.

[0051] B3 is diethanolamine, molecular formula C 4 h 11 NO 2 . The total amount of basic groups is y=3, and it is liquid at normal temperature.

[0052] Slowly add the above A3 solution into 0.2mol B3, control the dropwise temperature in an ice-water bath, and stir for 1.5 hours in an ice-water bath environment. During this period, the nitrogen atmosphere is maintained after the air and water vapor are removed by passing nitrogen.

[0053] Under stirring, the temperature was gradually raised to 140° C., and the first step reaction was carried out, and the reaction lasted for 2 hours.

[0054] Then add 0.3mol B3, and at the same time add 40g KOH, raise the temperature to 170°C, and carry out the se...

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Abstract

The invention relates to a self-lubrication liquid branched-polymer shear strength improving agent and a preparation method thereof and oil-based drilling fluid in the field of oil-based drilling fluid in petroleum drilling. The self-lubrication liquid branched-polymer shear strength improving agent is prepared from a substance A and a substance B through two-step reaction. The substance A refersto Xi-R<1>-X'j, wherein X refers to a carboxylate radical; X' refers to carboxylic acid anhydride; i and j are both greater than or equal to 0; the acid group amount x accords with that x=i+2j>/=2. The substance B refers to Ym-R<2>-Y'n, wherein Y refers to a -NH2 group or -NH group; Y' refers to an alcoholic hydroxyl group or phenolic hydroxyl group; m and n are both greater than or equal to 1; the alkaline group amount y accords with that y=m+n>/=2; i+2j+m+n is greater than or equal to 5; R<1> and R<2> are both straight chains, branch chains, cyclic aliphatic alkyl groups or aromatic alkyl groups, and a carbon atom number range is 1-72. Due to great self-lubrication and low-viscosity effects of branched polymer, integral structural force of an oil-based drilling fluid system can be increased, organic soil consumption and low-density solid phase tolerance of the oil-based drilling fluid system are decreased, and technical problems of rheological adjustment and borehole cleaning in a construction process of large-displacement wells and horizontal wells in application of the oil-based drilling fluid are solved.

Description

technical field [0001] The invention relates to the field of oil-based drilling fluid in petroleum drilling, and more particularly, relates to a self-lubricating liquid branched polymer cutting agent, a preparation method thereof and an oil-based drilling fluid. Background technique [0002] In recent years, oil-based drilling fluids have been widely used in shale gas exploration and development because of their strong inhibitory properties, outstanding lubricating properties, and stability of wellbore walls. Oil-based drilling fluid is a multi-component system formed by using oil as the continuous phase, brine as the dispersed phase, and adding organic soil and weighting materials. Due to the characteristics of the system itself, oil-based drilling fluids generally have problems such as low structural force and poor suspension stability, which make it difficult to meet the rock-carrying and sand-carrying requirements of shale gas wells in extended displacement and horizonta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G69/26C08G69/44
Inventor 李舟军王显光韩秀贞林永学甄剑武杨小华陈红壮韩子轩马鹏
Owner CHINA PETROLEUM & CHEM CORP
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