Low-friction-resistance water-based drilling fluid and preparation method thereof

A water-based drilling fluid and low-friction technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the single evaluation method of drilling fluid lubrication effect, restrict the maximum extension range of extended-reach wells, and fail to simulate realistically In order to solve the problems of downhole friction environment and other problems, it can achieve excellent wear resistance, low extreme pressure friction coefficient and reduce friction.

Active Publication Date: 2021-09-24
YANGTZE UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the deepening of exploration and development of oil and gas resources and the requirements of cost reduction and efficiency increase, the use of extended reach wells and horizontal wells is one of the main well types for exploration and development at present. In order to increase the oil production area and oil production volume, the horizontal displacement of extended-reach horizontal wells will be extended as far as possible, but the friction torque problem of the pipe string has always restricted the maximum extension range of extended-reach wells
The extreme pressure lubrication meter is calculated when the force of 150 inches·lbs is applied for 5 minutes. It evaluates the friction between the metal surface and the surface between the slider and the slip ring. In the actual drilling process, there may be metal points and points. , point-to-surface, surface-to-surface, and mudcake-to-metal friction, the evaluation method of the drilling fluid's lubrication effect is relatively simple, and it cannot truly simulate the downhole friction environment

Method used

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  • Low-friction-resistance water-based drilling fluid and preparation method thereof
  • Low-friction-resistance water-based drilling fluid and preparation method thereof
  • Low-friction-resistance water-based drilling fluid and preparation method thereof

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preparation example Construction

[0050] In the present invention, the preparation method of the ammonium polyphosphate preferably includes: mixing phosphoric acid and urea, and performing condensation reaction to obtain ammonium polyphosphate. In the present invention, the mass ratio of phosphoric acid and urea is preferably 95:60-130, more preferably 95:80-100. In the present invention, the temperature of the condensation reaction is preferably 180° C., and the time of the condensation reaction is preferably 60 minutes. In the present invention, after the condensation reaction, the obtained condensation product is dried, cooled and ground in sequence to obtain ammonium polyphosphate.

[0051] In the present invention, the polyphosphate aqueous solution is preferably formed by mixing polyphosphate and water.

[0052] In terms of parts by weight of the water, the raw materials for the preparation of the low-friction water-based drilling fluid provided by the present invention include 0.1-2.0 parts of an alkal...

Embodiment 1

[0063] 90 parts by mass of fresh water, 10 parts by mass of ammonium polyphosphate aqueous solution, 0.2 parts by mass of sodium hydroxide, 2.5 parts by mass of modified starch, 0.3 parts by mass of rheology modifier, 3.0 parts by mass of anti-slump plugging agent, 2.0 parts by mass of polyamine It is mixed with 90 parts by mass of barite and fully stirred to obtain a low-friction water-based drilling fluid.

[0064] The preparation method of the ammonium polyphosphate aqueous solution is as follows: put 60 parts by mass of urea and 95 parts by mass of phosphoric acid into a flask, heat and stir until foaming, react at 180°C for 60 minutes, dry, cool, and grind to obtain ammonium polyphosphate . 40 parts by mass of the ammonium polyphosphate and 100 parts by mass of water were uniformly mixed to obtain an aqueous solution of ammonium polyphosphate.

[0065] The preparation method of described modified starch is: with 10 parts by weight potato starch, 15 parts by weight tapioc...

Embodiment 2

[0069] 80 parts by mass of fresh water, 20 parts by mass of ammonium polyphosphate aqueous solution, 0.3 parts by mass of sodium hydroxide, 2.5 parts by mass of modified starch, 0.25 parts by mass of rheology modifier, 3.0 parts by mass of anti-slump plugging agent, 2.5 parts by mass of polyamine It is mixed with 90 parts by mass of barite and fully stirred to obtain a low-friction water-based drilling fluid.

[0070] The preparation method of the ammonium polyphosphate aqueous solution is as follows: put 80 parts by mass of urea and 95 parts by mass of phosphoric acid into a flask, heat and stir until foaming, react at 180°C for 60 minutes, dry, cool, and grind to obtain ammonium polyphosphate . 50 parts by mass of the ammonium polyphosphate and 100 parts by mass of water were uniformly mixed to obtain an aqueous solution of ammonium polyphosphate.

[0071] The preparation method of described modified starch is: with 20 parts by weight of potato starch, 35 parts by weight of...

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Abstract

The invention provides a low-friction-resistance water-based drilling fluid and a preparation method thereof, and relates to the technical field of oilfield chemistry. The low-friction-resistance water-based drilling fluid provided by the invention is prepared from the following preparation raw materials in parts by mass: 75-90 parts of water; 10-25 parts of a polyphosphate aqueous solution; 0.1-2.0 parts of an alkalinity regulator; 1.0-4.0 parts of a filtrate reducer; 0.1-0.6 parts of a rheological modifier; 1.0-3.5 parts of an anti-collapse blocking agent; 1.0-3.5 parts of an inhibitor; and 0-100 parts of barite. The low-friction-resistance water-based drilling fluid provided by the invention abandons the technical thought that an oily or water-based lubricant is added into the conventional water-based drilling fluid, is prepared on the basis of a polyphosphate aqueous solution with super-strong lubricity, and has the lubricating property comparable with that of an oil-based drilling fluid. The problems of friction resistance and torque of extended reach wells and horizontal wells can be solved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a low-friction water-based drilling fluid and a preparation method thereof. Background technique [0002] With the deepening of exploration and development of oil and gas resources and the requirement of reducing costs and increasing efficiency, the use of extended-reach wells and horizontal wells is one of the main well types for exploration and development at present. The horizontal displacement of the flat well, but the frictional torque of the pipe string has always restricted the maximum extension range of the extended-reach well. Shi Jiangang pointed out in his article "The Current Situation and Development Trend of Extended Reach Drilling Technology" that friction and torque are the core of extended reach drilling engineering problems. [0003] Oil-based drilling fluid is a commonly used drilling fluid system for complex well types such as extended-reach wells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C09K8/08
CPCC09K8/12C09K8/08Y02P20/141
Inventor 许明标由福昌周姗姗韩银府赵春艳
Owner YANGTZE UNIVERSITY
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