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A kind of drilling fluid suitable for shale gas well and preparation method thereof

A shale gas well and drilling fluid technology, applied in the field of shale gas well drilling fluid and its preparation

Active Publication Date: 2019-01-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the theories and related technologies can directly support the wellbore stability research of shale gas wells, but for the particularity of shale formations, such as weak expansion and strong dispersion, development of micro-fractures (micro-cracks) and micro-pores, low porosity and low permeability (10 -3 -10 -7 md), outstanding capillary effect, outstanding block collapse, etc., related theories, technologies and evaluation methods must be further improved and strengthened, such as mechanical and chemical coupling problems, micro-fractures, micro-fracture plugging evaluation methods and evaluation standards, according to well Calculation method of formation collapse pressure of shale horizontal wellbore determined by eye trajectory and in-situ stress state, quantitative relationship between drilling fluid inhibition and formation collapse pressure increment, etc.

Method used

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  • A kind of drilling fluid suitable for shale gas well and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0022] Wherein, the preparation method of described plugging agent comprises the following steps:

[0023] (1) dissolving nano silicon dioxide in N-methylpyrrolidone;

[0024] (2) mixing pyrrolidone with silane coupling agent;

[0025] (3) reacting the mixture obtained in step (1) with the mixture obtained in step (2);

[0026] (4) centrifuging the reactant obtained in step (3).

[0027] In the preparation method, wherein, the method also includes drying before dissolving the nano-silica in N-methylpyrrolidone; in the present invention, the nano-silica can be spherical, and the nano-silica Silicon can be purchased from Shanghai Yuantai Chemical Products Co., Ltd., the model is Y200.

[0028] In the preparation method, preferably, the conditions for drying the nano-silica may include: placing the nano-silica in a vacuum drying oven, drying the nano-silica at a temperature of 70-98°C for 18- 24 hours; more preferably, dry at 85-95°C for 20-22 hours.

[0029] In this prepara...

preparation example 1

[0049] This preparation example is to illustrate the preparation method of the modified nano silicon dioxide.

[0050] (1) Weigh 50 grams of nano silicon dioxide, place it in a vacuum drying oven, and dry it for 20 hours at 85°C;

[0051] (2) Take out the dried nano silicon dioxide in step (1) and place it in a three-necked flask, add 22 grams of N-methylpyrrolidone, and ultrasonically disperse for 40 minutes at 31° C., with an ultrasonic frequency of 3 MHz;

[0052] (3) 50 grams of pyrrolidone is mixed with 24 grams of silane coupling agent;

[0053] (4) Add the mixture obtained in step (3) to the mixture in step (2), then pass nitrogen gas, and react at 31°C for 280 minutes;

[0054] (5), the mixture obtained in step (4) is centrifuged, precipitated, filtered, and dried at a temperature of 65°C;

[0055] That is, the modified nano-silica G1 is obtained; and

[0056] The modified nano-silica G1 has a primary monodisperse structure with an average particle diameter of 55 na...

preparation example 2

[0058] This preparation example is to illustrate the preparation method of the modified nano silicon dioxide.

[0059] (1) Weigh 60 grams of nano silicon dioxide, place it in a vacuum drying oven, and dry it for 22 hours at 95°C;

[0060] (2) Take out the dried nano-silica in step (1) and put it in a three-necked flask, add 24 grams of N-methylpyrrolidone, and disperse it ultrasonically for 50 minutes at 35° C., and the ultrasonic frequency is 3.5 MHz;

[0061] (3) Mix 60 grams of pyrrolidone with 30 grams of silane coupling agent;

[0062] (4) Add the mixture obtained in step (3) to the mixture in step (2), then pass nitrogen gas, and react at 35°C for 320 minutes;

[0063] (5) The mixture obtained in step (4) is centrifuged, precipitated, filtered, and dried at a temperature of 65°C;

[0064] That is, the modified nano-silica G2 is obtained; and

[0065] The modified nano-silica G2 has a primary monodisperse structure with an average particle diameter of 58 nanometers.

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Abstract

The invention relates to the field of drilling fluid, and discloses a drilling fluid suitable for shale gas wells and a preparation method thereof, wherein the drilling fluid contains water, bentonite, viscosifier, flow pattern regulator, fluid loss reducer, plugging agent and weighting agent, and based on 100 parts by weight of water, bentonite is 1-10 parts by weight, tackifier is 5-15 parts by weight, flow regulator is 4-13 parts by weight, and fluid loss control agent is 4 parts by weight -13 parts by weight, the plugging agent is 20-55 parts by weight, and the weighting agent is 10-60 parts by weight; the present invention uses modified nano silicon dioxide as the plugging agent, so that its dispersion in the drilling fluid system becomes high, The particle size distribution is more uniform, especially suitable for drilling in shale formations with micro-fractures (micro-cracks) and micro-pores, low porosity and low permeability (10-3-10-7md), and outstanding capillary effect.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to a drilling fluid suitable for shale gas wells and a preparation method thereof. Background technique [0002] The key to drilling shale gas wells is the wellbore stability of shale well sections. The core issue is how to reduce the collapse pressure and use low-density drilling fluid to ensure wellbore stability, wellbore regularity, and downhole safety. [0003] Since it is not ideal to drill shale gas wells with oil-based drilling fluids, low-cost water-based drilling fluids will become possible. If the water-based drilling fluid technology can solve many of the above-mentioned problems, it will fill the gap in this field at home and abroad. [0004] The primary task of drilling shale gas wells with water-based drilling fluid technology is to determine the collapse pressure of the shale well section and the evaluation method for the increase of the collapse pressure caused by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/16C09K8/20
CPCC09K8/16C09K8/206C09K2208/10C09K8/20C09K8/426C09K8/5045C09K8/514
Inventor 白杨罗平亚王平全邓嘉丁
Owner SOUTHWEST PETROLEUM UNIV
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