Temperature-resistant and salt-resistant micro-crosslinking filtrate loss reducer for drilling fluid and preparation method of filtrate reducer

A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, reagents, drilling compositions, etc., which can solve the problem of not being able to meet the needs of temperature resistance and salt resistance, and the rheological properties of drilling fluid are greatly affected. Problems such as high molecular weight of the lost agent, to achieve the effect of outstanding temperature resistance and salt resistance, strong high temperature rubber protection ability, and small impact

Active Publication Date: 2020-06-16
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents all improve the temperature resistance of the fluid loss additive molecule by introducing a temperature-resistant functional group into the fluid loss additive molecule, but they still cannot meet the temperature and salt resistance requirements of deep well and ultra-deep well drilling, because the drilling fluid at high temperature The adsorp

Method used

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  • Temperature-resistant and salt-resistant micro-crosslinking filtrate loss reducer for drilling fluid and preparation method of filtrate reducer
  • Temperature-resistant and salt-resistant micro-crosslinking filtrate loss reducer for drilling fluid and preparation method of filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 8.5 g of acrylamide, 5.5 g of 2-methyl-2-acrylamidopropanesulfonic acid, 2.5 g of dimethyl diallyl ammonium chloride, 3.5 g of vinyl caprolactam and 10 mg of N,N-methylenebispropene Add amide to 150mL distilled water, adjust the pH to neutral with sodium hydroxide solution, put the reaction monomer solution into a three-necked flask, blow nitrogen to drive oxygen for 30min, heat to 60°C while stirring, add 40mg ammonium persulfate, After reacting for 3h, add 2g of n-butanethiol and continue the reaction for 1h. The viscous liquid in the reaction kettle is dried and crushed through a 20-mesh sample sieve to obtain a temperature-resistant and salt-resistant micro-crosslinked fluid loss reducer. The weight average molecular weight of this polymer is about 300,000.

Embodiment 2

[0035] Add 9.5g of acrylamide, 3.5g of vinylsulfonic acid, 2.5g of dimethyldiallylammonium chloride, 4.5g of vinylcaprolactam and 10mg of N,N-methylenebisacrylamide into 150mL of distilled water, and use hydrogen Sodium oxide solution to adjust the pH to neutral, put the reaction monomer solution into a three-necked flask, blow nitrogen to drive oxygen for 30 minutes, heat to a temperature of 60°C while stirring, add 40 mg of ammonium persulfate, react for 3 hours, and add 2 g of n-dodecylsulfur Alcohol, continue to react for 1h. The viscous liquid in the reaction kettle is dried and crushed through a 20-mesh sample sieve to obtain a temperature-resistant and salt-resistant micro-crosslinked fluid loss reducer. The weight average molecular weight of this polymer is about 400,000.

[0036] The performance of several evaluation samples will be evaluated below through specific implementation methods.

[0037] Comparative sample 1 is the temperature-resistant polymer fluid loss ...

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Abstract

The invention relates to a temperature-resistant and salt-resistant micro-crosslinking filtrate loss reducer for drilling fluid and a preparation method of the filtrate reducer; the micro-crosslinkingfiltrate loss reducer is generated by taking an alkenyl non-ionic monomer, an alkenyl anionic monomer, an alkenyl cationic monomer and the like as raw materials and using a proper amount of crosslinking agent and chain transfer agent for reaction. The micro-crosslinking filtrate loss reducer has the following advantages that the micro-crosslinking filtrate loss reducer contains a crosslinked microsphere structure, so that the filtrate loss of drilling fluid can be effectively reduced; various temperature-resistant and adsorption groups are contained, so that the temperature-resistant and salt-resistant properties are excellent; the molecular weight is low, and the influence on the rheological property of the drilling fluid is small.

Description

technical field [0001] The invention belongs to the field of drilling fluid preparation, in particular to a temperature-resistant and salt-resistant micro-crosslinked fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] With the in-depth development of petroleum exploration and development, the drilling depth continues to deepen, and the bottom hole temperature is getting higher and higher, which puts forward higher requirements for the temperature resistance of drilling fluid, especially the rheology and filtration of drilling fluid at high temperature. The main factor restricting the development of drilling fluid technology is that the original drilling fluid treatment agent can no longer fully meet the performance of drilling fluid at ultra-high temperature, so the research and development of anti-high temperature drilling fluid treatment agent and drilling fluid system suitable for deep and ultra-deep wells The attention o...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F226/04C08F226/06C08F222/38C08F228/02C09K8/035
CPCC08F220/56C09K8/035C08F228/02C08F226/04C08F226/06C08F222/385Y02P20/141
Inventor 谢彬强张现斌王磊磊楼一珊
Owner BC P INC CHINA NAT PETROLEUM CORP
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