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Leak stopping and wall protecting agent for petroleum drilling fluid and preparation method thereof

A technology for oil drilling and wall protection agent, which is applied in the directions of drilling compositions, chemical instruments and methods, can solve the problems of low wellbore stability, easily polluted oil and gas layers, and high production costs, and achieves strong wellbore stability, The effect of good cave effect and low production cost

Inactive Publication Date: 2011-10-19
HEBEI YIAN GASOLINEEUM DRILLING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of its composition, the above-mentioned plugging agents are loose in plugging, especially for plugging large-area well wall fractures, the effect of karst caves is poor, the well wall stability is low, oil and gas layers are easily polluted, and the production cost is high

Method used

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  • Leak stopping and wall protecting agent for petroleum drilling fluid and preparation method thereof
  • Leak stopping and wall protecting agent for petroleum drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Screen dry beet shreds, peanut shell powder, and pine wood chips with a particle size of 0.3 mm;

[0023] b. Stir and mix 30 kg of dried beet shreds for root, 30 kg of peanut shell powder, 30 kg of pine sawdust particles, and 13 kg of potassium polyacrylate to obtain the leak-stopping and wall-protecting agent of the present invention.

[0024] The results of closed fluid loss measurement are as follows:

[0025]

[0026] The base slurry adopts general standard base slurry, and the control wall protection agent is diesel bentonite plugging agent.

[0027] Result: within the same plugging time, the sealing fluid loss of the wall protecting agent of the present invention is significantly lower than that of the control wall protecting agent, indicating that the plugging ability of the wall protecting agent of the present invention and the ability to protect oil, gas, water and other production layers are better than diesel oil Bentonite plugging agent.

Embodiment 2

[0029] a. Screening particle diameter is 0.25mm root dry beet shreds, 0.3mm peanut shell powder, 0.3mm pagoda tree sawdust particles;

[0030] b. Stir and mix 60 kg of dried shredded beet for roots, 35 kg of peanut shell powder, 26 kg of locust wood sawdust, and 10 kg of potassium polyacrylate to obtain the plugging and wall protection agent of the present invention.

[0031] The results of closed fluid loss measurement are as follows:

[0032]

[0033] The base slurry adopts the common standard base slurry, and the wall protection agent of the control sample is a resin gel plugging agent.

[0034] Result: within the same plugging time, the sealing fluid loss of the wall protecting agent of the present invention is significantly lower than that of the control wall protecting agent, indicating that the plugging and wall protecting agent of the present invention has better plugging ability and ability to protect oil, gas, water and other production layers than resin Gel leak...

Embodiment 3

[0036] a. Screening particle diameter is 0.3mm dried beet shreds, 0.25mm peanut shell powder, 0.3mm pine sawdust particles;

[0037] b. Stir and mix 300 kg of dried beet shreds, 300 kg of peanut shell powder, 200 kg of pine wood chips, and 50 kg of potassium polyacrylate to obtain the plugging and wall protection agent of the present invention.

[0038] The present invention is combined with products such as high-efficiency anti-salt fluid loss reducing agent in the application process of a drilling team in the Xifeng block of Gansu. Cubic meters are added to the drilling fluid for plugging and retaining wall, and the effect of retaining wall is very good.

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Abstract

The invention relates to a leak stopping and wall protecting agent for a petroleum drilling fluid and a preparation method thereof. The agent comprises 20 to 80 wt% of dry vegetable silk, 30 to 40 wt% of plant fruit shell powder, 20 to 55 wt% of sawdust particles, and 5 to 15 wt% of a shale scattering inhibitor. The leak stopping and wall protecting agent of the invention, which allows different pervious beds in drilling and large area well wall crack to be stopped, has the advantages of low permeability after leak stopping, strong stability of the well wall, good caving, no pollution to oil gas layers, abundant raw materials, low production cost and the like, and is suitable for various drilling processes of the pervious beds.

Description

technical field [0001] The invention relates to a leak-stopping and wall-protecting agent and a preparation method thereof, in particular to a leak-stopping and wall-protecting agent used in petroleum drilling fluid, which belongs to the technical field of petroleum exploitation. Background technique [0002] With the increasing development of the oil extraction industry, the requirements for drilling fluid treatment agents are also getting higher and higher. In drilling operations, in order to prevent drilling mud from leaking to the well wall, plugging and wall protection agents are usually added to the drilling fluid. The existing plugging agents used in drilling fluids mainly include bridge filling plugging agents, diesel bentonite plugging agents, resin gel plugging agents, calcium sulfonate or sodium sulfonate oil-soluble plugging agents, etc. The above-mentioned lost circulation agent is limited by its composition, and its plugging is loose, especially for plugging l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/42
Inventor 彭鹤义杨建通王宝义毛广安倪佳宁李伟孙永进
Owner HEBEI YIAN GASOLINEEUM DRILLING MATERIAL
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