Method and fluid for controlling saturation of formation around well

A well fluid and rock formation technology, applied in the field of drilling, which requires liquid circulation, can solve the problem of not being able to provide high lubricating performance

Inactive Publication Date: 2003-10-29
INST FR DU PETROLE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, Example 7 clearly shows that the addition of less than 3 wt% of the mixt

Method used

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  • Method and fluid for controlling saturation of formation around well
  • Method and fluid for controlling saturation of formation around well
  • Method and fluid for controlling saturation of formation around well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The experiment was the injection of brine with or without the additive according to the invention into a presaturated porous medium in the presence of oil and water under Swi (initial water saturation) conditions (type (i) test).

[0096] The results are given in the table below:

[0097] Sw(%)

[0098] -Sw is the water saturation (percentage of water contained in the pore volume)

[0099] -Ko is the permeability of the rock core sample to oil expressed in millidarcy (expressed in SI unit, the conversion factor is: 1 Darcy=9.87×10 -13 m 2 ).

[0100] In the presence of 0.1 g / l PG8 / 10 additive in brine the result becomes:

[0101] Sw(%)

[0102]These leaching tests show that the addition of 0.1 g / l of PG8 / 10 additive can remove most of the residual water. Addition of additives to the brine injected into the porous media can thus alter the saturation by displacing residual water, thus resulting in higher oil saturation. It should be noted that...

Embodiment 2

[0103] The same experiment was carried out in the presence of 0.5 g / l polymer (polyacrylamide PAM) to approximate the actual composition of water-based mud filtrate. In the presence of PAM alone, there was no change in residual water saturation. However, the oil permeability decreases due to the adsorption of the polymer on the rock and due to the clogging of its pores by the polymer particles. As can be seen from the examples below, when PG8 / 10 was added, most of the residual water was displaced. It should also be noted that the reduction in oil permeability of the rock is less than in the presence of PAM alone.

[0104] Sw(%)

[0105] In the presence of 0.1 g / l PG8 / 10 in brine the result becomes:

[0106] Sw(%)

[0107] It can be concluded that the addition of PG8 / 10 removed most of the residual water and limited the decrease in oil permeability even in the presence of polymer.

Embodiment 3

[0108] Example 3: Variation in Saturation (Complete Formulation)

[0109] To get closer to actual conditions, dynamic filtering is performed and then the re-establishment of well production is simulated (type (ii) test). A water-based mud formulation is called FLOPRO, which is sold by MI Drilling Fluids Company (USA).

[0110] Its composition is as follows:

[0111] FLOVIS®: 6 g / l (xanthan gum - tackifier)

[0112] FLOTROL®: 7g / l (starch-water loss reducer)

[0113] HY-MOD PRIMA®: 28.5 g / l (filler clay)

[0114] NaCl: 20g / l

[0115] KCl: 20g / l

[0116] IDCARB 75®: 360g / l (carbonate)

[0117] pH=8

[0118] The result is as follows:

[0119] Sw(%)

[0120] In the presence of 0.1 g / l PG8 / 10 in brine the result becomes:

[0121] Sw(%)

[0122] These experiments carried out on the complete formulation confirmed that good results were obtained with respect to saturation (29% saturation of residual water after oil refluxing in the presence of 1 g / l ...

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Abstract

The present invention relates to methods and fluids for drilling or operating wells through porous permeable rock formations into which water-based well fluids flow. The method comprises adding to the liquid, in addition to the standard components of this liquid, not more than 3% by weight of a composition obtained from fats, oils and alcohols, the chain lengths of the acid and alcohol moieties being selected such that the resulting esters are soluble in water Sufficient dispersion, compatibility with the components, no emulsification with reservoir oil and sufficient adsorption on porous rock formations.

Description

field of invention [0001] The present invention relates to the field of drilling, and more generally to the field of operations in which drilling requires the circulation of fluids in contact with porous, permeable rock walls. During these operations, fluid is circulated to a greater or lesser extent through the thickness of the well wall, depending on the efficiency of fluid loss reducing additives that may be added to the fluid. "Filtrate" (the volume of liquid that seeps into the rock) is known to cause plugging of the well wall to varying degrees. If the well penetrates a hydrocarbon producing zone, the production rate can be severely reduced. The present invention proposes a fluid and a method for use in drilling a well or in a drainage hole for the initial production of hydrocarbon producing formations and to facilitate the flow of these hydrocarbons into the well. [0002] Fluids used while drilling are circulated along the formation at an overpressure relative to the...

Claims

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Application Information

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IPC IPC(8): C09K8/04C09K8/03C09K8/06C09K8/22
CPCC09K8/06C09K8/22
Inventor A·奥迪伯特J·-F·阿吉利尔D·隆格伦C·德瓦蒂内斯M·杨森
Owner INST FR DU PETROLE
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