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Foam drilling fluid

A drilling fluid and foam technology, applied in the field of foam drilling fluid, can solve the problem that the treatment agent does not have long-term inhibition performance, achieve long-term inhibition performance, reduce downhole complex situations, and have strong anti-pollution ability

Inactive Publication Date: 2014-04-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when applying it, the problem of mutual matching between treatment agents should be considered; in addition, different treatment agents have different inhibitory abilities to shale, and most of the existing treatment agents do not have long-term inhibitory properties.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1 foam drilling fluid

[0038] The raw materials and mass ratio of foam drilling fluid are:

[0039] Blowing agent (CTAB) 1%,

[0040] Foam stabilizer (XC) 0.2%,

[0041] Shale inhibitor (choline chloride: polyoxyethylene diamine: polyetheramine: 4,4-diaminodicyclohexylmethane = 1:1:1.5:1.5 compound) 5%,

[0042] Shale stabilizer (hydrolyzed product after copolymerization of dimethylaminopropyl methacrylamide and vinyl acetate) 0.4%,

[0043] The balance is water, hydrochloric acid or sodium hydroxide solution to adjust the pH of the solution to 8-10.

[0044]Preparation method: Dissolve the foam stabilizer in water at normal temperature and pressure for more than 10 hours of prehydration treatment (prehydration treatment is to dissolve the polymer in water to make its molecular chain more stretchable, because this requires a certain Time, so let it stay in the water for about 10 hours), then weigh the raw materials according to the above ratio, add the f...

Embodiment 2

[0045] Embodiment 2 foam drilling fluid

[0046] The raw materials and mass ratio of foam drilling fluid are:

[0047] Foaming agent (AES: BS-12=1:4 compound) 1%,

[0048] Foam stabilizer (XC:CMC=2:1 compound) 0.3%,

[0049] Shale inhibitor (choline chloride: polyetheramine: 4,4-diaminodicyclohexylmethane = 2:2:1 compound) 5%,

[0050] Shale stabilizer (graft copolymer of methacryloylpropyltrimethylammonium chloride and polyvinyl alcohol) 0.5%,

[0051] The balance is water, hydrochloric acid or sodium hydroxide solution to adjust the pH of the solution to 8-10.

[0052] Preparation method: under normal temperature and pressure, first dissolve the foam stabilizer in water for more than 10 hours of prehydration treatment, then weigh the raw materials according to the above ratio, stir the foam stabilizer, foaming agent, and mud shale to suppress Add the agent and shale stabilizer into water, mix and stir evenly, and adjust the pH to 8-10 to obtain the foam drilling fluid of...

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Abstract

The invention relates to the field of petroleum drilling, in particular to a foam drilling fluid, which is used for maintaining stability of a well wall, preventing bit balling and keeping continuous drilling after formation water occurs during gas drilling. According to the invention, the foam drilling fluid comprises the following components in percentage by mass: 0.5-2.0% of foaming agent, 0.2-0.5% of foam stabilizer, 2-10% of mud shale inhibitor and the balance of water; and pH value of the foam drilling fluid is 8-10. The foam drilling fluid provided by the invention has the advantages of excellent foam performance, stronger mud shale inhibiting ability and enduring mud shale inhibiting performance; and underground complicated problems, such as cutting-carrying and water carrying problems, well wall instability problems, sticking problems and the like, after the formation water occurs during gas drilling can be solved, so that safe and rapid drilling is achieved.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to the foam drilling fluid for maintaining the stability of the well wall, preventing the balling of the drill bit and maintaining the continuous drilling after the gas drilling encounters formation water. Background technique [0002] Gas drilling technology refers to the technology that uses gas as a circulating medium to realize drilling during the drilling process. It has unique advantages in improving the mechanical penetration rate, effectively discovering and protecting reservoirs, and solving complex downhole accidents. Therefore, it has been well received at home and abroad. Rapid development and promotion. However, gas drilling has high requirements on downhole engineering geological conditions, field equipment and construction technology. Once the conditions are not met, gas drilling cannot be implemented smoothly. Among them, the formation water problem is one of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38
Inventor 舒小波赵晓东孟英峰万里平李皋钟水清
Owner SOUTHWEST PETROLEUM UNIV
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