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Positive borehole wall stabilizer for oil and gas drilling and preparation method thereof

A wellbore stabilizer, a technology for oil and gas drilling, which is applied in the field of oil and gas drilling, and can solve the problems of inability to contain wellbore walls, plugging and preventing collapse, poor formation adaptability in long open-hole sections, and single action mechanism.

Inactive Publication Date: 2016-02-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a positive well wall stabilizer for oil and gas drilling and a preparation method thereof, aiming at solving the problem that the well wall stabilizer provided by the prior art has a relatively simple mechanism of action and cannot inhibit and block the well wall at the same time Anti-slump effect and poor adaptability to formations with long open hole sections

Method used

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  • Positive borehole wall stabilizer for oil and gas drilling and preparation method thereof
  • Positive borehole wall stabilizer for oil and gas drilling and preparation method thereof
  • Positive borehole wall stabilizer for oil and gas drilling and preparation method thereof

Examples

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preparation example Construction

[0032] The preparation method comprises the following steps:

[0033] In step S101, under stirring conditions, dissolving the asphalt in the dissolved oil heated to 120°C-140°C, and adding liquid protective agent, emulsifier, and solid protective agent after fully dissolving;

[0034] In step S102, after heat preservation and stirring at 100°C to 110°C for 1 hour to 1.5 hours, add inorganic acid, continue stirring, and heat preservation for 0.5 hour to 1 hour, then add inorganic salt solution;

[0035] In step S103, after the temperature is lowered to 80° C. to 90° C., the mixture is stirred and kept warm for 20 minutes to 30 minutes, the stirring is continued, and the material is discharged when the temperature drops to 60° C.

Embodiment 1

[0052] Example 1: Add 80g of 3# kerosene to a 500mL three-necked flask; heat the kerosene to 110°C, turn on the mixer, add 65g of 10# asphalt and 65g of 70# asphalt to the three-necked flask, heat up to 118°C and keep warm until the asphalt is completely After melting, cool down to 100°C; add 12g of liquid protective agent, 4g of emulsifier, and 6g of calcium oxide to the three-necked flask, and keep warm at 92°C for 30 minutes; add 10g of concentrated hydrochloric acid to the three-necked flask, and keep warm at 90°C for 40 minutes; Add 80 g of 10% calcium chloride solution into the three-necked flask, and keep the temperature for 20 minutes. Stop heating, and when the temperature in the three-neck flask drops to about 65°C, stop stirring, pour the sample into a sample bottle, and wait for evaluation.

Embodiment 2

[0053] Example 2: Add 90g of 3# kerosene to a 500mL three-necked flask; heat the kerosene to 115°C, turn on the mixer, add 60g of 5# asphalt and 60g of 40# asphalt to the three-necked flask, heat up to 124°C and keep warm until the asphalt is completely After melting, cool down to 105°C; add 14g of liquid protective agent, 6g of emulsifier, and 9g of calcium hydroxide to the three-necked flask, and keep warm at 97°C for 40 minutes; add 13g of concentrated hydrochloric acid to the three-necked flask, and keep warm at 95°C for 40 minutes ; Add 10% calcium chloride solution 70g in the there-necked flask and keep it warm for 20 minutes. Stop heating, and when the temperature in the three-neck flask drops to about 70°C, stop stirring, pour the sample into a sample bottle, and wait for evaluation.

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Abstract

The invention discloses an electronpositive borehole wall stabilizer applied to oil and gas drilling and a preparation method of the electronpositive borehole wall stabilizer. The electronpositive borehole wall stabilizer applied to oil and gas drilling is prepared from the following components in percentage by mass: 15 to 30% of solvent oil, 35 to 50% of asphalt, 3.5 to 6% of liquid protective agent, 1 to 4% of emulsifying agent, 1.5 to 5% of solid protective agent, 3 to 6% of inorganic acid, and the balance of inorganic salt solution; the electronpositive borehole wall stabilizer is a brownish black jelly and has pH (Potential Of Hydrogen) being 2 to 5, an electrokinetic potential being not less than 40mV, colloidal stability being not less than 90 days, and apparent viscosity increase rate being not less than 40%, and has shale recovery ratio being more than 10% of that of a KC1 solution; and the electronpositive borehole wall stabilizer has excellent water solubility, and relatively wide and adjustable distribution of softening points, is remarkable in force shearing effect, can perform the effects of inhibiting, blocking, and preventing the well from collapsing at the same time, and has relatively high adaptability to the stratum in a long-open-hole section.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling, and in particular relates to a positive well wall stabilizer for oil and gas drilling and a preparation method thereof. Background technique [0002] The problem of wellbore stability is a complex worldwide problem often encountered in oil and gas drilling engineering. Especially after the 1980s, as the exploration field continued to expand to new areas and the formations encountered became increasingly complex, the problem of wellbore stability during drilling Still stand out. [0003] The reasons for the instability of shale formations can be divided into two categories from the induction mechanism: mechanical reasons and physical and chemical reasons; mechanical reasons include plastic deformation of shale, hard and brittle shale etc.) and the density of the drilling fluid cannot balance the structural stress or the abnormal pressure formed during the compaction of the mud shale,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/575C09K8/42
Inventor 黄维安邱正松崔明磊徐加放江琳曹杰钟汉毅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)