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Weak gel for drilling fluid and preparation method of weak gel

A technology of weak gelling agent and drilling fluid, which is applied in the field of weak gelling agent for drilling fluid and its preparation, which can solve the problems of static suspended sand and dynamic sand-carrying that cannot be solved well, lift cutting and resist temperature difference, resist Problems such as poor temperature effect, to solve the problem of static suspended sand and dynamic sand carrying, good viscosity increase and cutting, and improve the effect of structure

Active Publication Date: 2015-04-29
BEIJING SHIDABOCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the weak gelling agent for drilling fluid is a kind of viscosity-increasing and shear-increasing agent. The existing viscosity-increasing and shearing-increasing agents mainly include macromolecules and biological glues. Ordinary biological glue has the effect of increasing viscosity and lifting shear, but the effect of temperature resistance is poor, the best temperature resistance is around 90 ℃, which is far from meeting the requirements of weak gelling agent for drilling fluid in the production process of oilfields
Moreover, the problems of static suspended sand and dynamic sand carrying in the horizontal well section cannot be solved well.

Method used

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  • Weak gel for drilling fluid and preparation method of weak gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Under normal temperature conditions, add 100 parts of clear water to the reactor, turn on the stirring, and then slowly add 30 parts of modified konjac vegetable gum, 3 parts of surfactant, 10 parts of N,N-dimethylacrylamide, 27 parts of acrylamide, 13 parts of diacetone acrylamide, 15 parts of soda ash, adjust the pH value to 8.5, stir for 30-60 minutes, blow nitrogen to remove oxygen for 20-40 minutes, when the temperature of the reaction kettle is around 20°C, add them in sequence 1 part of photoinitiator, 0.5 part of EDTA and 0.5 part of chain transfer agent, the above-mentioned reactants are all added according to the aforementioned ratio; this polymerization is an exothermic reaction, with the addition of the three initiators, the temperature of the material will rise slowly. When it rises to the highest point and stops rising (1-2 hours), keep the temperature constant and polymerize for 6-8 hours under the irradiation of ultraviolet rays, then granulate...

Embodiment 2

[0017] Example 2: Under normal temperature conditions, add 100 parts of clear water to the reactor, turn on the stirring, and then slowly add 35 parts of modified konjac vegetable gum, 4 parts of surfactant, 10 parts of N,N-dimethylacrylamide, 20 parts of acrylamide, 14 parts of diacetone acrylamide, 15 parts of soda ash, adjust the pH value to 8.5, stir for 30-60 minutes, blow nitrogen to remove oxygen for 20-40 minutes, when the temperature of the reaction kettle is around 20°C, add them in sequence 1 part of photoinitiator, 0.5 part of EDTA and 0.5 part of chain transfer agent, the above-mentioned reactants are all added according to the aforementioned ratio; this polymerization is an exothermic reaction, with the addition of the three initiators, the temperature of the material will rise slowly. When it rises to the highest point and stops rising (1-2 hours), keep the temperature constant and polymerize for 6-8 hours under the irradiation of ultraviolet rays, then granulate...

Embodiment 3

[0018] Example 3: Under normal temperature conditions, add 100 parts of clear water to the reactor, turn on the stirring, and then slowly add 35 parts of modified konjac vegetable gum, 3 parts of surfactant, 10 parts of N,N-dimethylacrylamide, 20 parts of acrylamide, 14 parts of diacetone acrylamide, 15 parts of soda ash, adjust the pH value to 8.5, stir for 30-60 minutes, blow nitrogen to remove oxygen for 20-40 minutes, when the temperature of the reaction kettle is around 20°C, add them in sequence 1 part of photoinitiator, 1 part of EDTA and 1 part of chain transfer agent, the above reactants are all added according to the aforementioned ratio; this polymerization is an exothermic reaction, with the addition of the three initiators, the temperature of the material will rise slowly, when the temperature When it rises to the highest point and stops rising (1-2 hours), keep the temperature constant and polymerize for 6-8 hours under the irradiation of ultraviolet rays, then gr...

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Abstract

The invention provides a weak gel for a drilling fluid and a preparation method of the weak gel. The weak gel is characterized by being prepared by sequentially adding natural modified plant gel, acrylamide, N,N-dimethacrylamide, a nonionic fluorocarbon surfactant, diacetone-acryloamide and sodium carbonate under normal temperature conditions, adjusting the pH value to be 8-9, introducing nitrogen to deoxidize, adding an initiator, implementing polymerization reaction under radiation of ultraviolet light, and drying, thereby preparing a finished product. The weak gel provided by the invention is good in temperature resistance property and tackification and lifting cutting effect, can be used in a horizontal well to improve the property of the drilling fluid in carrying rock debris, can solve the problem of static sand suspension and dynamic sand carrying in a horizontal well section, is additionally good in computability and is applicable to light slurry and salt water slurry, and a reservoir stratum can be protected and is slightly damaged.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a weak gelling agent for drilling fluid and a preparation method thereof. Background technique [0002] With the deepening of oil and gas exploration and development and the increasing drilling scale, the requirements for drilling fluid performance are also increasing. Drilling fluid technologies for deep wells, ultra-deep wells, horizontal wells and extended-reach wells need to consider high temperature reservoirs, complex well trajectory and strict environmental requirements. Therefore, research on weak gelling agents for high-temperature viscosifying drilling fluids has received more and more attention and attention. At present, the weak gelling agent for drilling fluid is a kind of viscosity-increasing and shear-increasing agent. The existing viscosity-increasing and shearing-increasing agents mainly include macromolecules and biological glues. ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/58C08F220/56C08F251/00
CPCC08F251/00C09K8/035C08F220/56
Inventor 冯海平鄢捷年熊开俊杨万成马平平王义虎凌山全晓虎刘洪明
Owner BEIJING SHIDABOCHENG TECH
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