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Method of re-fracturing using borated galactomannan gum

A technology of galactomannan and repeated fracturing, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., and can solve problems such as insufficient production in production areas

Inactive Publication Date: 2016-11-16
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This often results in underproduction in the production area

Method used

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  • Method of re-fracturing using borated galactomannan gum
  • Method of re-fracturing using borated galactomannan gum
  • Method of re-fracturing using borated galactomannan gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1. The effect of different levels of pH on the onset of gel hydration was tested using viscosity measurements. The result is as figure 2 shown. In each test run, 100 ppt of polymer in water was used to generate a gel. The pH of the slurry was 8.84. Sodium hydroxide solution (10% by weight in water) was used to increase the pH to values ​​of 9.5, 9.75 and 10.1. The slurry is loaded in the viscometer and measured at 100sec -1 The shear rate was used to determine the viscosity. The temperature of the viscometer was ramped from 70°F to 250°F over two hours and then held constant at 250°F for an additional hour. figure 2 shows that pH affects viscosity in the following way:

[0077] a. A pH greater than 9.75 causes the gel to not hydrate at all and become viscous;

[0078] b. At pH 9.5, the viscosity of the gel begins to increase after 60-65 minutes, but the viscosity is short-lived; and

[0079] c. At a pH of 8.84, the viscosity of the gel begins to increa...

Embodiment 2

[0081] Example 2. Using the above procedure, the effect of adding borax as a retarder while maintaining a pH of 9.5 was examined. The result is as image 3 shown. For each run, 100 ppt of polymer in water was used and the pH was adjusted with sodium hydroxide solution to produce a gel. Borax was added as a retarder at 1%, 2%, 3% by weight of the polymer. The slurry is loaded in the viscometer and measured at 100sec -1 The shear rate was used to determine the viscosity. The temperature of the viscometer was ramped from 70°F to 250°F over two hours and then held constant at 250°F for an additional hour. The results indicated that borax by itself (without any pH adjustment) did not delay hydration, but made a significant difference in reducing the rate of hydration when the binding pH was increased from 8.84 to 9.5. specifically:

[0082] a. Control runs of the gel at native pH 8.84 and borax at 2% by weight of the polymer showed no difference in hydration;

[0083] b. ad...

Embodiment 3

[0087] Example 3. The influence of pH and retarder on hydration time was investigated and the results are as follows Figure 4 shown. For each test run, 100 ppt of polymer in water was used to generate the gel. The pH of the slurry was 8.84. Lower pH values ​​were obtained by adding acetic acid until pH values ​​of 8.5 and 8.75 were obtained. Higher pH values ​​were obtained by adding sodium hydroxide solution (10% by weight in water), pH values ​​9 and 9.2. The slurry is loaded in the viscometer and measured at 100sec -1The shear rate was used to determine the viscosity. The temperature of the viscometer was ramped from 70°F to 100°F in 30 minutes and then held constant at 100°F for an additional 90 minutes. In some runs, borax was added as a retarder. The results show that hydration time can vary with pH. specifically:

[0088] a. Gels with a native pH of 8.84 and borax at 3% by weight of the polymer showed no difference in hydration;

[0089] b. Gels without retard...

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Abstract

A well treatment fluid containing borated galactomannan may be used to isolate a productive zone in a well having multiple productive zones. The fluid is particularly useful in treatment of wells containing a mechanical zonal isolation system in the productive zone of interest. The fluid is pumped into the well in a substantially non-hydrated form. The well treatment fluid is therefore highly effective in preferentially sealing or blocking productive zones in the formation since delayed hydration of the fluid may be controlled for up to several hours. The seal may be degraded and a productive zone subjected to re-fracturing by introducing a viscosity reducing agent into the well.

Description

technical field [0001] The present invention relates to the use of a well treatment fluid comprising borated galactomannan gum as a temporary seal to achieve zonal isolation between intervals of a wellbore and as a substitute for cement. The invention further relates to a method of refracturing a subterranean formation, wherein the temporary seal is removed from the well by exposing the temporary seal to a viscosity reducing agent. Background technique [0002] Typically, a subterranean formation traversed by a well has a number of different regions or formations of interest. In producing fluids from a well, it is often desirable to establish communication only with areas or formations of interest so that stimulation treatments do not inadvertently flow into non-productive areas or areas of diminished interest. Selective stimulation (eg, by hydraulic fracturing and acid stimulation) becomes significant as the life of the well and the productivity of the well decline. [00...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/514C09K8/62C09K8/44C09K8/512C09K8/88C09K8/90C04B26/28E21B43/26
CPCC04B26/28C09K8/426C09K8/44C09K8/512C09K8/514C09K8/62C09K8/887C09K8/90E21B43/261C09K2208/24C09K2208/26C04B22/0013E21B43/26
Inventor D·V·S·古普塔
Owner BAKER HUGHES INC
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