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Tough particle plugging system for fractured leakage well drilling plugging and preparation method thereof

A ductile and granular technology, which is applied in the field of ductile particle plugging system and its preparation for fractured leakage drilling and plugging, can solve problems such as difficulty in predicting the opening degree of lost fractures, unsatisfactory effect of plugging while drilling, and wellbore scrapping.

Inactive Publication Date: 2021-10-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During drilling operations in fractured formations, lost circulation is the most common downhole complex situation. Lost circulation will bring huge economic losses to drilling companies, and may also cause safety accidents such as pipe sticking, blowout, and well collapse during drilling construction. It may even cause the wellbore to be scrapped, seriously affecting the drilling construction process
[0003] For the fractured leakage during the drilling process, bridge plugging materials are usually used on site. Due to the difficulty in predicting the opening of leakage fractures, the matching relationship between conventional bridge plugging materials such as calcium carbonate and walnut shells and the fracture opening of the leakage zone cannot be determined. Accurate judgment
In addition, the retention of particle groups inside the fracture is difficult and the stability is poor, resulting in the unsatisfactory plugging effect while drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the indoor environment, the specific gravity of 10g is 0.82g / cm 3 , tensile modulus 3.0 MPa, tensile strength 8.0 MPa, elongation 500%, flexural modulus 10.0, softening temperature 40°C, oval tough particles with a particle size of 2mm, weigh 5g isooctyl phosphate, dissolve in 200mL of water, fully stirred, under the condition of 50 ℃, the tough particles were dispersed in isooctyl phosphate, stirred and aged for 30min, taken out, and dried at low temperature to obtain isooctyl phosphate modified particles.

[0020] In 1000mL water, add 50g sodium carboxymethylcellulose, 20g bistriethanolamine diisopropyl titanate, 30g sodium laurate, 20g sodium dodecylsulfonate, 20g sodium metaaluminate, 10g sodium bicarbonate, Fully stir under the high-speed mixer not lower than 600r / min to form a recyclable foam carrying system.

[0021] Add the obtained isooctyl phosphate-modified particles into 1000mL liquid system, and mix well to form the required tough particle plugging syst...

Embodiment 2

[0029] In the indoor environment, the specific gravity of 10g is 0.82g / cm 3 , tensile modulus 3.0 MPa, tensile strength 8.0 MPa, elongation 500%, flexural modulus 10.0, softening temperature 40 ℃. For round tough granules with a particle size of 1mm, weigh 5g of phosphate starch, dissolve it in 200mL of water, stir thoroughly, and disperse the tough granules in phosphate starch at 50°C, stir and age for 30min, take it out, dry it at low temperature, and set aside .

[0030] In 1000mL water, add 50g sodium carboxymethylcellulose, 60g polyacrylamide, 20g bistriethanolamine diisopropyl titanate, 30g sodium carboxyethylcellulose, 20g sodium dodecylbenzenesulfonate, 10g carbonic acid Sodium, fully stirred with a high-speed mixer not lower than 600r / min to form a recyclable foam carrying system.

[0031] Add phosphate starch surface-modified granules into 1000mL liquid system, and mix well to form the required tough granule plugging system.

[0032] As mentioned above, the indoor...

Embodiment 3

[0034] In the indoor environment, the specific gravity of 10g is 0.79g / cm 3 , tensile modulus 4.0 MPa, tensile strength 10.0 MPa, elongation 650%, flexural modulus 12.0, softening temperature 45 ℃. For clover-shaped tough particles with a particle size of 3mm, weigh 5g of dodecyl phosphate, dissolve it in 200mL of water, stir well, and disperse the tough particles in the aqueous solution of dodecyl phosphate at 50°C, stir and age for 30min. Take it out, dry it on low temperature, and set aside.

[0035] In 1000mL water, add 50g sodium carboxymethylcellulose, 40g carboxyethylcellulose, 25g xanthan gum, 30g sodium carboxyethylcellulose, 20g sodium lauryl sulfate, 10g triethanolamine, 10g sodium bicarbonate, Fully stir under the high-speed mixer not lower than 600r / min to form a recyclable foam carrying system.

[0036] Add phosphate starch surface-modified granules into 1000mL liquid system, and mix well to form the required tough granule plugging system.

[0037] As mentione...

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Abstract

The invention discloses a tough particle plugging system for fractured leakage well drilling plugging and a preparation method thereof. Polymer surface modified tough particles are added into recyclable foam drilling fluid, and the good deformation and pressure bearing capacity of the tough particles are utilized to self-match the crack size to plug the crack. The bonding capacity of the tough particles and the stratum surface can be improved through polymer surface modification, the stability of the plugging structure and the retention capacity of the particles in crack are improved, the plugging structure of the tough particles can be removed by adding a gel breaker into a system, the particles return along with flow-back liquid, and the particles can be recycled. The tough particle plugging system for fractured leakage well drilling plugging prepared by the invention has the characteristics of self-matching crack width, high plugging bearing strength, no damage to a reservoir, simple operation method, recyclability and the like, and is suitable for the processes of fractured leakage well drilling plugging, oil and gas well reservoir temporary plugging fracturing transformation and the like.

Description

technical field [0001] The invention belongs to the technical field of oil field chemistry, and in particular relates to a ductile particle plugging system for drilling leak plugging in fractured leakage and a preparation method thereof. Background technique [0002] During drilling operations in fractured formations, lost circulation is the most common downhole complex situation. Lost circulation will bring huge economic losses to drilling companies, and may also cause safety accidents such as pipe sticking, blowout, and well collapse during drilling construction. It may even cause the wellbore to be scrapped, seriously affecting the drilling construction process. [0003] For the fractured leakage during the drilling process, bridge plugging materials are usually used on site. Due to the difficulty in predicting the opening of leakage fractures, the matching relationship between conventional bridge plugging materials such as calcium carbonate and walnut shells and the frac...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/38C09K8/42
CPCC09K8/03C09K8/38C09K8/426
Inventor 陶秀娟
Owner SHAANXI UNIV OF SCI & TECH
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