Temporary plugging agent for drilling fluid and water-based drilling fluid and application

A technology of water-based drilling fluid and temporary plugging agent, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of adaptive plugging and environmental protection of formations with different permeability, which are difficult to take into account, and achieve reservoir protection. The effect of remarkable ability, high acid solubility and good rheological fluid loss

Active Publication Date: 2019-05-21
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a temporary plugging agent for drilling fluid and its preparation method and water-based drilling method in order to overcome the defect that the temporary plugging agent in the prior art is difficult to take into account the self-adaptive plugging and environmental protection of formations with different permeability. Liquid and application, wherein, the temporary plugging agent can take into account the technical problems of self-adaptive plugging of formations with different permeability and environmental protection

Method used

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  • Temporary plugging agent for drilling fluid and water-based drilling fluid and application
  • Temporary plugging agent for drilling fluid and water-based drilling fluid and application
  • Temporary plugging agent for drilling fluid and water-based drilling fluid and application

Examples

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preparation example Construction

[0031] The second aspect of the present invention provides a method for preparing a temporary plugging agent, wherein the method includes the following steps:

[0032] (1) Add starch to deionized water for gelatinization reaction to obtain gelatinized starch;

[0033] (2) The activator solution is prepared by contacting the activator with carbonic acid,

[0034] (3) In the presence of a crosslinking agent and an initiator, the gelatinized starch and the vinyl graft monomer are polymerized in the activator solution.

[0035] According to the present invention, in step (1), the starch is dissolved in water, placed in the reaction vessel, the stirring device is turned on, and nitrogen is introduced to remove the oxygen in the flask, and the starch is gelatinized at 60-80°C. -40min, preferably, gelatinization at 70°C for 30min.

[0036] According to the present invention, in step (2), an activator solution is prepared, and calcium carbonate is slowly added dropwise to the activator at a ra...

Embodiment 1

[0048] This example is to illustrate the temporary plugging agent of the present invention and its preparation method

[0049] Dissolve 2g corn starch in 50g water, put it in a 250mL three-necked flask, gelatinize at pH=7, 70℃ for 30min; add 1g sodium stearate into 50g water to prepare activator solution, and slowly add average particle size under high-speed stirring 2.4g of 80nm calcium carbonate, after stabilization, transfer it into a three-necked flask; adjust the system temperature to 50℃, add 0.5g of ammonium persulfate, and after pre-initiation for 15min, add 2g of acrylic acid, 4g of acrylamide, and 2-acrylamide-2-methyl Propanesulfonic acid 2g, N,N-dimethylacrylamide 0.5g, reaction time 3h to obtain the product; the product and acetone are mixed in Soxhlet extractor for 10h, then washed with ethanol, and dried at 70℃ , Crushed and sieved to obtain a degradable starch-based drilling fluid temporary plugging agent, marked as S1.

Embodiment 2

[0051] This example is to illustrate the temporary plugging agent of the present invention and its preparation method

[0052] Dissolve 2.5g corn starch in 50g water, put it in a 250mL three-necked flask, gelatinize at pH=7, 70℃ for 30min; add 1g gemini quaternary ammonium salt surfactant into 50g water to prepare activator solution, stirring slowly under high speed Add 1.6g of calcium carbonate with an average particle size of 8.5μm, and transfer it into a three-necked flask after stabilization; adjust the system temperature to 50℃, add 0.5g of ammonium persulfate, 15min after pre-initiation, then add 3g of acrylic acid, 3g of acrylamide, and 2-acrylamide 1.5g of -2-methylpropanesulfonic acid and 0.5g of N,N-dimethylacrylamide. The product was obtained after a reaction time of 3h; the product and acetone were mixed in a Soxlet extractor for 10h and then washed with ethanol. After being dried at 70°C, crushed and sieved to obtain a degradable starch-based temporary plugging agent...

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Abstract

The invention relates to the technical field of environment-friendly drilling fluid temporary plugging in a petroleum drilling process and discloses a temporary plugging agent for a drilling fluid anda water-based drilling fluid and an application. The temporary plugging agent is prepared by carrying out a polymerization reaction between gelatinized starch and a vinyl grafted monomer in an activator solution in the presence of a crosslinking agent and an initiator. The vinyl grafted monomer comprises acrylic acid, acrylamide and 2-acrylamide-2-methyl propanesulfonic acid and the gelatinized starch is prepared by carrying out a gelatinization reaction of starch added into deionized water. The temporary plugging agent provided by the invention can be biodegraded, the degradation rate of thetemporary plugging agent in soil for 90 days can reach 50% or higher, and the temporary plugging agent is environmentally friendly. The water-based drilling fluid with the temporary plugging agent has a good rheologic filtration property and can temporarily plug strata of different permeability self-adaptively, and the permeable temporary plugging reaches 100%. The temporary plugging agent is high in acid solubility, the permeability recover value can reach 85% or higher after the temporary plugging agent is acidized to unplug, and the reservoir protection ability is obvious.

Description

Technical field [0001] The invention relates to the technical field of environmental protection drilling fluid temporary plugging in the process of petroleum drilling, in particular to a temporary plugging agent for drilling fluids, a preparation method thereof, and water-based drilling fluids and applications. Background technique [0002] Shielding temporary plugging is a reservoir protection technology widely used in the process of drilling and completion. The technology is to add temporary plugging agent to the drilling fluid to form a dense temporary plugging layer and prevent the solid and liquid phases from invading in the drilling fluid. The reservoir causes damage. The temporary plugging agent must be strictly matched with the pore throat diameter of the formation to form a high-quality temporary plugging zone. This is difficult to achieve in the actual production process. The selected temporary plugging agent is only suitable for a certain well section and has a tempora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C08F220/54C09K8/514C09K8/035
CPCC09K8/035C09K8/04C09K8/512C09K8/514C09K8/08C09K8/12C09K8/426
Inventor 黄维安王婧雯雷明张家旗李公让吕开河吴雄军邱正松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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