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Aluminum-based anti-collapse agent for drilling fluid

An anti-slump agent and drilling fluid technology, applied in the field of oil drilling, can solve the problems of difficult control of rheology, difficult control of dosage, difficulty of large-scale use, etc.

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of drilling fluid technology at the present stage, many plugging agents with different forms and characteristics have been developed, mainly including silicate-based sealing agents and polymeric alcohol-based sealing agents, which are widely used. It has also received good results, but there are also shortcomings that are difficult to overcome
For example, polymeric alcohol plugging agents are expensive and difficult to use on a large scale, while the biggest weakness of silicates is that rheology is difficult to control
At present, the aluminum-based anti-slump agent used in China has a great influence on the rheology and fluid loss of drilling fluid, and the dosage is not easy to control, which cannot meet the environmental protection requirements in current drilling projects.

Method used

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  • Aluminum-based anti-collapse agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Synthesis of indoor sample of new high-efficiency aluminum-based anti-slump agent:

[0018] The amount of organic acid added is 100.8g, and the pH value is adjusted by using 0.1mol / L NaOH solution or 0.1mol / L HCl solution. During this process, the stirring speed is greater than 500r / min, and the water bath is heated. Add the organic acid first, then add 200g of aluminum-containing compound after heating up to 90°C. Then keep the temperature at 200r / min and stir evenly for 5-10h, cool, dry at 105°C, and pulverize to obtain aluminum-based anti-slump agent powder.

Embodiment 2

[0020] Evaluation of hydration swelling inhibition: Determination of shale swelling ratio. Compared with deionized water (expansion rate 23.21%), when the aluminum-based anti-slump agent solution is used as the test solution, the expansion rate of the artificial rock sample is 12.87%, a decrease of 44.54%, indicating that the aluminum-based anti-slump agent has good Hydration swelling inhibition.

Embodiment 3

[0022] Evaluation of mudstone wellbore anti-collapse inhibition: determination of shale stability index.

[0023] (1) Preparation of artificial rock samples with high water content Pass the experimental mudstone powder through a 100-mesh sieve, dry it, and stir and mix it with 3.3% NaCl solution at a mass ratio of 7:3 to obtain a wet rock sample (slurry); put the wet rock sample in a container Fully hydrate in a desiccator with a constant water activity solution for 16 hours; weigh 150g of wet rock sample into a sample press, and press it under a certain pressure for 2 hours; After 3 minutes, the applied pressure should be 2.0MPa higher than the forming pressure; use a penetration meter to measure the depth and penetration of the surface of the assembled rock sample; put 350mL test solution into the rolling tank, and tighten the upper cover of the rolling tank to seal it. Assemble the rock sample and immerse it in the test solution, roll it hot or soak it for a certain period ...

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Abstract

The invention relates to an aluminum-based anti-collapse agent for drilling fluid. The efficient aluminum-based anti-collapse agent is synthesized through reaction of organic acids with aluminum-containing compounds under an acid condition at 25-105 DEG C, wherein the organic acids are gallotannic acid, citric acid, humic acid and oxalic acid; the aluminum-containing compounds are aluminum hydroxide, aluminum chloride, aluminum sulfate and aluminum nitrate. Aiming at a mudstone stratum, the aluminum-based anti-collapse agent can inhibit hydration expansion of clay and shale by virtue of the unique chemical property of organic acid-aluminum, pressure conduction in shale can be retarded, and the semipermeable membrane property of shale can be improved. By adopting the aluminum-based anti-collapse agent, the linear expansion rate of shale within 8 hours is less than or equal to 15%, a high / low water content shale sample can be effectively stabilized, the pore pressure transfer in mudstone can be reduced by more than 12 times, the induction osmotic pressure can be increased by greater than 50%, and the aluminum-based anti-collapse agent is excellent in anti-collapse property and beneficial for well wall stabilization.

Description

technical field [0001] The invention relates to a plugging and anti-collapse agent for drilling fluid in the process of petroleum drilling, which is used in drilling fluid construction and belongs to the field of petroleum drilling. technical background [0002] Wellbore instability is a common and often encountered complex problem in oil and gas drilling. Downhole complex accidents caused by well wall instability are extremely harmful to drilling and completion, and have always been a prominent problem in the petroleum engineering circles at home and abroad. During drilling operations, once the wellbore instability occurs, it will not only delay the drilling time, damage oil and gas layers, interfere with geological logging, etc., but also lead to a series of downhole complex situations and accidents such as well collapse and drill sticking. It may even cause the wellbore to be scrapped, resulting in significant economic losses. [0003] During drilling, more than 75% of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035E21B21/00
CPCC09K8/035C09K2208/12
Inventor 邱正松张世锋黄维安刘均一钟汉毅曹杰赵欣王伟吉毛惠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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