Invert emulsion based completion and displacement fluid and method of use

a technology of displacement fluid and emulsion, which is applied in the field of displacement and chemical breaker fluid, can solve the problems of high risk of pipe sticking, high initial and operational cost of oil-based drilling fluid and mud, and torque and drag on the drill string

Inactive Publication Date: 2006-10-05
MI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023] Accordingly, there exists a need for a displacement and chemical breaker solution that will remove invert emulsion filter cake without dam...

Problems solved by technology

In such highly deviated holes, torque and drag on the drill string are a significant problem because the drill pipe lies against the low side of the hole, and the risk of pipe sticking is high when water-based muds are used.
Despite the many benefits of using oil-based muds, they have disadvantages.
In general, the use of oil-based drilling fluids and muds have high initial and operational costs.
These costs can be significant depending on the depth of the hole to be drilled.
However, the higher costs can often be justified if the oil-based drilling fluid prevents the caving in or hole enlargement that can greatly increase drilling time and costs.
Although filter cake formation is essential to drilling operations, the filter cake can be a significant impediment to the production of hydrocarbon or other fluids from the well...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066] An invert emulsion drilling mud was formulated having the following components, all of which are commercially available, as shown below in Table 1.

TABLE 1ComponentAmountDiesel0.546bblEmulsifier Package consisting of:VG-PLUS3.0ppbVERSAMUL8.0ppbVERSACOAT2.0ppbLime6.0ppbBrine consisting of:Water0.298bblCalcium Chloride62.1ppbCalcium Carbonate40ppbSilica flour (simulating cuttings)18ppb

[0067] The above invert emulsion drilling fluid was heat aged by hot rolling for 16 hours at 196° F. and exhibited the properties shown in Table 2. The properties listed in Table 2,

TABLE 2Heat-aged @ 196° F.-16 hrs - Rheology @ 120° F.600 RPM44300 RPM24200 RPM17100 RPM10 6 RPM3 3 RPM3Gels 10″5 lbs / 100ft2Gels 10′12 lbs / 100ft2Plastic Viscosity20cPYield Point4cPElectrical Stability293volts

[0068] The initial flow of a fritted alumina filter disk (35 micron) was determined using 200 ml of diesel at 20 psig. A filter cake was then built on to the filter disk by application of the above fluid under pr...

example 2

[0072] A reversible invert emulsion drilling mud was formulated having the following components, all of which are commercially available, as shown below in Table 5.

TABLE 5ComponentAmountDiesel193.6 / 162.6ml / gEmulsifier Package consisting of:VG-PLUS2gFAZEMUL12gFAZEWET4gLime4g10.25 ppg Calcium Chloride Brine118.6 / 146ml. gCalcium CarbonateSAFECARB 24gSAFECARB 107gSAFECARB 2020gSilica flour (simulating cuttings)18g

[0073] The above reversible invert emulsion drilling fluid was heat aged by hot rolling for 16 hours at 150° F. and exhibited the following properties, as shown below in Table 6.

TABLE 6Heat-aged @ 150° F.-16 hrs - Rheology @ 120° F.600 RPM51300 RPM36200 RPM30100 RPM23 6 RPM10 3 RPM8Gels 10″8 lbs / 100ft2Gels 10′9 lbs / 100ft2Plastic Viscosity15cPYield Point21cPElectrical Stability267volts

[0074] Filter cakes built from the above reversible invert emulsion drilling fluid were subjected to a modified High Temperature High Pressure (HTHP) Filtration test. The HTHP Filtration test u...

example 3

[0077] An invert emulsion drilling mud was formulated having the following components, all of which are commercially available, as shown below in Table 10.

TABLE 10ComponentAmountDiesel193.6 / 162.6ml / gEmulsifier Package consisting of:VG-PLUS4gVERSACOAT4gVERSAMUL5gLime6gTapwater90.4ml / gCalcium Chloride24.1gCalcium CarbonateSAFECARB 102gSAFECARB 2010gSAFECARB 4048gSAFECARB 25010gSilica flour (simulating cuttings)18g

[0078] The above invert emulsion drilling fluid was heat aged by hot rolling for 16 hours at 150° F. and exhibited the following properties, as shown below in Table 11.

TABLE 11Heat-aged @ 150° F.-16 hrs - Rheology @ 120° F.600 RPM41300 RPM25200 RPM20100 RPM14 6 RPM8 3 RPM8Gels 10″9 lbs / 100 ft2Gels 10′10 lbs / 100 ft2Plastic Viscosity16 cPYield Point9 cPElectrical Stability249 volts

[0079] Filter cakes built from the invert emulsion drilling fluid, formulated as shown in Table 10 were built on disks (3a-3c) and subjected to a modified HTHP Filtration test. Filters cakes built...

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PUM

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Abstract

A method of cleaning a wellbore prior to the production of oil or gas, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake is disclosed. The method may include circulating a breaker fluid into the wellbore, where the breaker fluid includes a non-oleaginous internal phase and an oleaginous external phase, where the non-oleaginous phase includes a water soluble polar organic solvent, a hydrolysable ester of a carboxylic acid, and a weighting agent, and the oleaginous external phase includes an oleaginous fluid and an emulsifier, and where the hydrolysable ester is selected so that upon hydrolysis an organic acid is released and the invert emulsion of the filter cake breaks.

Description

[0001] This application claims the priority under 35 U.S.C. §119 to U.S. application Ser. No. 60 / 668,485 filed Apr. 5, 2005. That application is incorporated by reference in its entirety.BACKGROUND OF INVENTION [0002] 1. Field of the Invention [0003] Embodiments relate generally to wellbore fluids. More specifically, embodiments relate to displacement and chemical breaker fluids. [0004] 2. Background Art [0005] During the drilling of a wellbore, various fluids are typically used in the well for a variety of functions. The fluids may be circulated through a drill pipe and drill bit into the wellbore, and then may subsequently flow upward through wellbore to the surface. [0006] During this circulation, the drilling fluid may act to remove drill cuttings from the bottom of the hole to the surface, to suspend cuttings and weighting material when circulation is interrupted, to control subsurface pressures, to maintain the integrity of the wellbore until the well section is cased and ceme...

Claims

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Application Information

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IPC IPC(8): C09K8/00E21B43/00
CPCC09K8/32C09K2208/26C09K8/52
Inventor SVOBODA, CHARLESRAVITZ, RAYMOND D.LUYSTER, MARK
Owner MI
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