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A kind of reservoir drilling fluid system and preparation method thereof

A liquid and drilling technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of detonation, complex types of drilling fluid components, complex preparation methods, etc., to improve compatibility and dispersibility, The effect of excellent flowback plugging removal performance and good temporary plugging performance

Active Publication Date: 2022-07-15
山东维斯特尔石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the type of drilling fluid components is relatively complex, the compatibility is not good, and the preparation steps of the nano-membrane structure plugging agent are cumbersome, and the requirements for the control of reaction conditions are relatively high. The reaction involves processes such as chain extension, which is prone to explosion. Defects such as poly
[0005] CN105969322A discloses a temporary plugging agent for reservoir drilling fluid, which is characterized in that it comprises the following raw materials in parts by weight: 60-80 parts of heavy calcium carbonate powder, 0-20 parts of light calcium carbonate powder and 10-20 parts of magnesium oxide 20 parts, the preparation process of the temporary plugging agent requires crushing, grinding, acid-dissolving, calcining, compression, spraying and many other operations on the marble powder, the preparation method is relatively complicated, and the temporary plugging agent uses the same traditional solid filling Particles, the plugging effect is not good in the actual reservoir environment with complex and changeable topography

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A reservoir drilling fluid system, comprising the following components by weight: nanocrystalline cellulose 3%, calcium formate 1%, polyamine inhibitor 2%, lauryl ricinoleate 2%, graphite 1%, nitrate 1% Sodium humate 2%, polymer fluid loss reducer 1%, sodium perfluorononenyloxybenzene sulfonate 4%, dodecyltrimethylammonium chloride 2%, alkyl glycoside 2%, 2% barite powder, 1% triethanolamine, and the balance of deionized water.

[0027] The nanocrystalline cellulose is prepared by a method comprising the following steps: using a high-speed pulverizer to crush castor rods to obtain solid particles with a particle size of 3-5 mm, adding an inorganic strong acid solution to the solid particles and stirring at constant temperature for 3.5 hours , filter to obtain crude cellulose; add deionized water with 15 times the mass of the solid particles into the crude cellulose, stir evenly, and perform ultrasonic treatment on the obtained mixture for 1 h, stand and dry to obtain th...

Embodiment 2

[0035] A reservoir drilling fluid system, comprising the following components by weight: nanocrystalline cellulose 4%, calcium formate 2%, polyamine inhibitor 6%, lauryl ricinoleate 3%, graphite 2%, nitrate Sodium humate 3%, polymer fluid loss reducer 2%, sodium perfluorononenyloxybenzene sulfonate 5%, dodecyl trimethyl ammonium chloride 3%, alkyl glycoside 3%, 2% barite powder, 1.5% triethanolamine, and the balance of deionized water.

[0036]The nanocrystalline cellulose is prepared by a method comprising the following steps: using a high-speed pulverizer to crush castor rods to obtain solid particles with a particle size of 3-5 mm, adding an inorganic strong acid solution to the solid particles and stirring at constant temperature for 3.5 hours , filter to obtain crude cellulose; add deionized water with 15 times the mass of the solid particles into the crude cellulose, stir evenly, and perform ultrasonic treatment on the obtained mixture for 1 h, stand and dry to obtain th...

Embodiment 3

[0044] A reservoir drilling fluid system, comprising the following components by weight: 5% of nanocrystalline cellulose, 2% of calcium formate, 8% of polyamine inhibitor, 4% of lauryl ricinoleate, 3% of graphite, 3% of nitric acid 5% sodium humate, 3% polymer fluid loss reducer, 6% sodium perfluorononenyloxybenzene sulfonate, 5% dodecyl trimethyl ammonium chloride, 5% alkyl glycosides, 3% barite powder, 1.5% triethanolamine, and the balance of deionized water.

[0045] The nanocrystalline cellulose is prepared by a method comprising the following steps: using a high-speed pulverizer to crush castor rods to obtain solid particles with a particle size of 3-5 mm, adding an inorganic strong acid solution to the solid particles and stirring at constant temperature for 3.5 hours , filter to obtain crude cellulose; add deionized water with 15 times the mass of the solid particles into the crude cellulose, stir evenly, and perform ultrasonic treatment on the obtained mixture for 1 h,...

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Abstract

The invention relates to the technical field of oilfield chemical preparation, in particular to a reservoir drilling fluid system and a preparation method thereof. Using natural plant raw materials to extract nanocrystalline cellulose and using specific raw materials to synthesize polyamine inhibitors, the two are scientifically compounded with calcium formate, lubricants, surfactants, fluid loss control and other components, and the resulting drilling fluid system has excellent The rheology, fluid loss reduction, temporary plugging removal, lubrication and other properties are excellent, and the system has low biological toxicity and good environmental protection performance; and the preparation method is simple and feasible, and can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical agent preparation, in particular to a reservoir drilling fluid system and a preparation method thereof. Background technique [0002] At present, drilling fluid is a chemical preparation that must be used in oilfield development, and is an important guarantee measure to ensure the safety, quality, efficiency and speed of drilling production operations. During the drilling process, the working fluid invades the reservoir. Due to the sensitivity of the reservoir, the solid phase particles of the drilling fluid and the formation particles migrate, block the pore throat, and cause damage to the reservoir, resulting in a significant decrease in reservoir permeability, which seriously affects the later stage. Therefore, effective reservoir protection is an effective guarantee for achieving higher oil and gas recovery. [0003] CN105295872A discloses a drilling fluid suitable for tight sandsto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/06C09K8/10C09K8/508C09K8/514C08F251/00C08B15/02
CPCC09K8/10C09K8/12C09K8/514C09K8/5083C09K8/5086C08F251/00C08B15/02C09K2208/34C09K2208/12C08F222/06
Inventor 梁飞王兆永孔庆明张新向
Owner 山东维斯特尔石油科技有限公司
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