Treatment fluid with oxidizer breaker system and method

A technology for processing fluids and breakers, applied in the directions of chemical instruments and methods, drilling compositions, etc., and can solve problems such as delay in breaking gel, less expected break width, and complex breaker system.

Inactive Publication Date: 2011-04-13
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Premature failure can also result in less desirable fracture widths in the resulting fracture
On the other hand, too much delay on the broken gel is also undesirable
Delayed destruction can result in significantly hindered hy

Method used

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  • Treatment fluid with oxidizer breaker system and method
  • Treatment fluid with oxidizer breaker system and method
  • Treatment fluid with oxidizer breaker system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Tests were performed using sodium bromate as the destroyer and sodium bisulfite as its activator. A 3-hour oil bath test at 175°F (79.4°C) showed that in the absence of activator, 0.06wt% sodium bromate did not destroy the fluid at this temperature, whereas 0.012wt% and 0.024wt% % additional sodium bisulfite in the fluid sample completely degrades the fluid.

Embodiment 2

[0067] Such as figure 1 Shown in , as a comparison, cross-linked guacamole was used without breaker, with 0.06% sodium bromate breaker without any activator, and with combinations of both breaker and sodium bisulfite at different concentrations and ratios. Er gum solution for rheological studies. from figure 1 As can be seen in , sodium bromate itself cannot oxidize the fluid. Bromate / bisulfite systems are capable of oxidizing fluids at 175°F (79.4°C) and reducing viscosity.

Embodiment 3

[0069] Encapsulated sodium metabisulfite particles containing 70% by weight of MBS coated with 30% by weight of polyvinylidene chloride were also tested as an activator for sodium bromate in order to obtain a delayed breakdown of the cross-linked fluid . The rheological data are shown in figure 2 , in which different concentrations and ratios of sodium bromate and encapsulated MBS were used. Delayed destruction was observed to be concentration dependent. The data are consistent with the corresponding oil bath test results. A drop in pH was noted when either bisulfite or MBS was used, but no drop was observed when the encapsulated form of MBS was used. In the case of borate fracturing fluids, the fluid loses viscosity when the pH decreases as borate crosslinkers convert to boron-containing species resulting in less active crosslinkers. The drop in pH can be compensated by adding a base such as sodium hydroxide to the fluid.

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Abstract

A treatment fluid composition for treating a subterranean formation is formed from an aqueous fluid, a hydratable polymer and a polymer breaking system. The polymer breaking system includes an oxidizing breaking agent and an activator capable of providing a bisulfite ion source. A method of treating a subterranean formation may also be performed by forming a treatment fluid comprising an aqueous hydrated polymer solution and a polymer breaking system. The polymer breaking system includes a breaking agent of an oxidizer and an activator capable of providing a bisulfite ion source. The treatment fluid is introduced into the formation.

Description

technical field [0001] The present invention relates to treatment fluids for treating subterranean formations. In particular, the present invention relates to viscosified treatment fluids and compositions and methods for disrupting such fluids. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] In the oil and gas industry, carbohydrate polymers are used as viscous fracturing fluids. These polymers can be crosslinked with various ions such as boron, zirconium and titanium to further increase their viscosity. Polysaccharides such as guar and guar derivatives are commonly used to viscose water-based fluids for fracturing treatments and for proppant transport. The proppant remains in the created fracture to keep the fracture open and create a conductive pathway extending from the wellbore to the formation along the length of the fracture. After the fra...

Claims

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Application Information

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IPC IPC(8): C09K8/60C09K8/68
CPCC09K2208/26C09K8/887C09K8/685C09K8/68C09K8/90
Inventor 苏米特拉·穆克霍帕蒂亚
Owner PRAD RES & DEV LTD
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