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Aphron-containing oil base fluids and method of drilling a well therewith

A fluid and foam technology used in drilling and maintenance fluids to solve problems such as loss of circulating fluid

Inactive Publication Date: 2002-02-27
阿克蒂系统股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One disadvantage of oil-based muds is that they tend to promote fluid loss during drilling compared to water-based drilling muds of the same density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0018] In its broadest sense, the present invention relates to the introduction of fine foams in oil-based drilling and maintenance fluids (hereinafter sometimes referred to as "OBWDAS" fluids). The OBWDAS fluid may be any such fluid known in the art, such as those sold by well-known companies such as: Baroid (INVERMUL TM , PETROFREE TM , ENVIROMUL TM , BAROID 100 TM etc.); Baker Hughes (CARBO-MUL TM , CARBO-DRILL TM , CARBO-TEC TM , CARBO-FAST TM , CARBO-CORE TM , SYN-TEQ TM etc.); M-I (NOVADRIL TM , NOVAPLUS TM , NOVALITE TM etc.); Dowell Schlumberger (ULTRADRILL TM wait wait wait. According to the present invention, the LSRV of the OBWDAS fluid is first increased to at least 10,000 cps, preferably at least 20,000 cps, most preferably at least about 40,000 cps by incorporating therein a compatible viscosifier. Thereafter, a compatible fine foam generating surfactant is added to the fluid and generates a fine foam therein.

[0019] The OBWDAS fluids of the prese...

Embodiment 1

[0073] With 1g of propylene carbonate dispersant, 8.0g of CARBO-GEL TM The organophilic hectorite was dispersed in 300 g (1 bbl equivalent) of diesel to form a viscous slurry. Add 2.0g of STEOL TM CS-460 Surfactant while mixing in a high speed (shear) mixer. The fine foam is introduced into the viscous fluid at the vortex of the mixer.

Embodiment 2

[0075] Repeat Example 1, but use 11.0 g of CARBO-GEL TM .

[0076] The fluids of Examples 1-2 were measured for Brookfield viscosity at 0.5 rpm (which is a measure of LSRV) and at 100 rpm. The ratio of the viscosity at 0.5 rpm to the viscosity at 100 rpm is a measure of the shear thinning properties of the fluid. The density of the fluid was also measured and used to calculate the concentration of fine foam in the fluid using the following formula:

[0077] (calculated density - actual density) (100) ÷ (calculated density).

[0078] The data obtained are listed in Table A.

[0079] Table A

[0080]Brookfield Viscosity, cp Density Calculated Fine Foam Density Vol. Example 0.5rpm 100rpm STI ppg ppg % 1 47,000 369 127 5.58 7.40 24.6 2 111,000 912 122 6.51 7.47 12.9

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PUM

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Abstract

Aphron-containing oil based well drilling and servicing fluids are disclosed which seal microfractutres and the like during drilling and well servicing operations, thus decreasing the volume of fluid lost to the formations contacted by the fluids. The fluids comprise an oleaginous liquid as the continuous phase, a viscosifier which imparts a low shear rate viscosity to the fluids of at least 10,000 centipoise, an aphron-generating surfactant, and aphrons. The fluids are used in a conventional method of drilling an oil and / or gas well or in conventional methods of servicing or treating such wells, such as in completion, workover, sand control, and frac pack operations, and as spotting fluids to released stuck pipes or tools in a wellbore.

Description

[0001] This patent application is a continuation-in-part of US Patent Application No. 08 / 800,727 (filed 02 / 13 / 97) and PCT International Patent Application No. PCT / US98 / 02566 (filed 02 / 10 / 98); they are hereby claimed priority of each. Background of the invention [0002] In pending patent application No. 08 / 800,727 (applied 02 / 13 / 97, incorporated herein by reference) and pending PCT patent application No. PCT / US98 / 02566 (applied 02 / 10 / 98, incorporated herein by reference ) discloses aqueous drilling and well maintenance fluids which exhibit high low shear rate viscosity (hereinafter often referred to as "LSRV") and which contain aphrons (ie, microbubbles of gas). A preferred fluid has a fine foam produced by drawing air with which the fluid contacts and by the pressure drop and cavitation that occur as the flowing fluid exits the drill bit. However inert gases such as nitrogen and carbon dioxide can be introduced into the fluid independent of the air being drawn in, or can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/08C09K8/20C09K8/32C09K8/575E21B21/00
CPCC09K8/5758C09K8/08C09K8/32C09K8/206E21B21/00E21B21/003
Inventor 汤米·F·布鲁凯杰克·C·考恩
Owner 阿克蒂系统股份有限公司
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