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A bridging agent for natural gas well diversion fracturing microbubble temporary plugging fluid and its application

A technology of temporary plugging fluid and bridging agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of salt resistance, poor calcium ability, poor foaming ability, affecting the bubble formation rate, etc. Stable foaming effect and low dosage

Active Publication Date: 2021-01-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anionic bridging agent has strong foaming ability, but poor salt and calcium resistance, and the large amount of foaming affects the pumping effect of working fluid; nonionic bridging agent has strong salt and calcium resistance, but poor foaming ability, which affects bubble formation rate

Method used

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  • A bridging agent for natural gas well diversion fracturing microbubble temporary plugging fluid and its application
  • A bridging agent for natural gas well diversion fracturing microbubble temporary plugging fluid and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a bridging agent for natural gas well diversion fracturing micro-bubble temporary plugging fluid, which is compounded by anionic surfactant, betaine and weak base, the anionic surfactant, betaine and weak base The mass ratio of the base is (2-4):(5-7):(1-2).

[0025] The bridging agent for microbubble temporary plugging fluid used in natural gas well diversion fracturing is specially designed according to the characteristics of the microbubble temporary plugging fluid system, and is a bridging agent for non-solid microbubble temporary plugging fluid to reduce gas The surface tension of the liquid wraps the gas that enters the liquid phase with mechanical stirring, effectively forming a bubble structure in the microbubble system, adjusting the density of the working fluid, and achieving anti-salt and anti-calcium pollution effects at the same time, suitable for temporary plugging of natural gas wells when turning to fracturing working environment. ...

Embodiment 2

[0027] On the basis of Example 1, the anionic surfactant is sodium dodecylbenzenesulfonate.

[0028] The betaine is an alkyl betaine, and the alkyl betaine is preferably dodecyl dimethyl betaine, tetradecyl dimethyl betaine, octadecyl dimethyl betaine, dodecyl betaine One of dihydroxyethyl betaine and octadecyl dihydroxyethyl betaine.

[0029] Described weak base is the one in sodium bicarbonate, sodium hydroxide, sodium carbonate.

[0030] The sodium dodecylbenzenesulfonate, betaine, and weak base are all commercially available, and common industrial products can be used.

Embodiment 3

[0032] The present invention also provides a method for preparing the microbubble temporary plugging fluid by using the bridging agent for the above-mentioned natural gas well steering fracturing microbubble temporary plugging fluid, which includes the following steps: firstly, under stirring conditions, adding filler to the water to prepare Test the base liquid, then add a bridging agent into the test base liquid, and stir to obtain a microbubble temporary plugging liquid; wherein the mass ratio of water: filler: bridging agent is (90-110): (2-4) : (0.5~1.5).

[0033] The filler is prepared from carboxyethyl cellulose, carboxymethyl starch and polyacrylamide according to the mass ratio (9-11):(1-3):(2-3).

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Abstract

The invention discloses a bridging agent for turnaround fracture microbubble temporary blocking fluid of a natural gas well and an application of the bridging agent. The bridging agent is prepared from an anionic surfactant, glycine betaine and weak base in a mass ratio being (2-4):(5-7):(1-2) through compounding. The invention further provides a method for preparing the microbubble temporary blocking fluid from the bridging agent. The method comprises steps as follows: a filling agent is added to water under the stirring condition, a test base solution is prepared accordingly, the bridging agent is added to the test base solution, stirring is performed, and the microbubble temporary blocking fluid is obtained. The bridging agent is applied to the solid-free microbubble temporary blockingfluid, can form a gas nucleus structure in the microbubble temporary blocking fluid and has the characteristics of low consumption and stable foaming effect, besides, intensity of bubbles in the microbubble temporary blocking fluid can be adjusted, the bridging agent is suitable for the environment with the temperature lower than or equal to 130 DEG C, meanwhile, resistance of the microbubble temporary blocking fluid to salt and calcium pollution is improved, and the bridging agent has great significance in research, development and application of the turnaround fracture microbubble temporaryblocking fluid of the natural gas well.

Description

technical field [0001] The invention belongs to the technical field of treatment agents for drilling fluids, and relates to a treatment agent for microbubble plugging fluid suitable for natural gas well diversion fracturing temporary plugging operations, in particular to a frame for natural gas well diversion fracturing microbubble temporary plugging fluid Bridging agent and its application. Background technique [0002] Natural gas well diversion fracturing microbubble temporary plugging fluid refers to the working fluid used to temporarily plug initial fractures in natural gas well refracturing operations. [0003] During the refracturing operation of natural gas wells, how to prevent the fracturing fluid from entering the existing old fractures in the formation and generating new fractures extending along the direction of the old fractures, resulting in unsatisfactory stimulation effects of refracturing. [0004] Use temporary plugging materials to seal the existing old ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/70C09K8/514C09K8/90C09K8/60
CPCC09K8/514C09K8/602C09K8/68C09K8/703C09K8/90C09K2208/18
Inventor 许洪星王祖文张冕兰建平杨敏高红平纪冬冬郭艳萍尹俊禄
Owner BC P INC CHINA NAT PETROLEUM CORP
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