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3M Glass Bubbles HGS4K28

IP.com Disclosure Number: IPCOM000243859D
Publication Date: 2015-Oct-22
Document File: 4 page(s) / 339K

Publishing Venue

The IP.com Prior Art Database

Abstract

When drilling and cementing across highly depleted zones and weaker formations low density systems capable of reducing the hydrostatic pressure of the fluid column during the operation are required to prevent or minimize fluid loss lost circulation and other problems associated with excessive overbalance conditions The use of 3M Glass Bubbles as density reducing agents for drilling completion work over and cement slurries offer the potential for Reduced Non Productive Time NPT improved well integrity and increased well productivity With a nominal density of 0 28 g cc and an isostatic crush strength of 4 000 psi the newest 3M Glass Bubbles product HGS4K28 is ideal for completion and work over operations in shallow to intermediate depth wells By affording greater density reduction capabilities than other lightweight additives under similar downhole conditions HGS4K28 helps to achieve and maintain the target density throughout the operation using less volume

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3M™ Glass Bubbles HGS4K28

When drilling and cementing across highly depleted zones and weaker formations, low density systems capable of reducing the hydrostatic pressure of the fluid column during the operation are required to prevent or minimize fluid loss, lost circulation, and other problems associated with excessive overbalance conditions. The use of 3MGlass Bubbles as density reducing agents for drilling, completion, work-over and cement slurries offer the potential for Reduced Non Productive Time (NPT), improved well integrity and increased well productivity. With a nominal density of 0.28 g/cc and an isostatic crush strength of 4,000 psi, the newest 3M™ Glass Bubbles product HGS4K28 is ideal for completion and work-over operations in shallow to intermediate depth wells. By affording greater density reduction capabilities than other lightweight additives under similar downhole conditions, HGS4K28 helps to achieve and maintain the target density throughout the operation, using less volume.

3M™ Glass Bubbles in Cementing

If wellbores encounter weak or depleted zones, standard cement cannot be used because the bottom-hole pressure will exceed the pressure gradient and cement will get lost to the formation1. Losses to the formation may result in reduced top of cement (TOC), and thus the need for remedial squeeze. Losses may also result in formation damage and, consequently, reduced well productivity. Service companies offer cement solutions made light enough to circulate in such situations while retaining the ability to withstand down-hole conditions2 and maintaining adequate compressive strength to meet regulatory guidelines.

The optimum means to adjust slurry density depends in part on the formation conditions of the well and logistics such as onsite availability of specialists, materials, equipment and the service company's experience, and preferred practices. Lightweight cements can be achieved using water extension, foamed cement or lightweight microspheres3,4 (Table 1). Adding additional water to the cement slurry is a common means of reducing slurry density, yet it requires water-extending additives to help maintain slurry stability and overcome slow compressive strength development and low ultimate compressive strength2. The operations of a foamed cement job require additional equipment. Any problems such as incorrect nitrogen ratio, slurry density or insufficient foamer can have a serious effect on the success of the job. Lightweight jobs (comprising hollow microspheres) are operationally simpler and utilize conventional equipment5.

Lightweight hollow microspheres are typically pozzolanic (cenospheres) or made of glass. Cenospheres, a by-product of coal combustion at thermal power plants, are relatively inexpensive, but quality can vary from batch to batch and availability can be an issue3. Hollow glass microspheres are engineered products and have greater pressure tolerance than cenospheres. They are availa...