Weatherford’s engineered solutions put you in control

Engineered Chemistry®

Completion

Production

Intervention

Drilling

Evaluation

Mutual SolventsSolutions Customized for Maximum Production

Chemical Services

Acidizing additives Biocides Cementing additives Completion additives Compression chemicals Drilling additives Engineered Chemistry® services

Analytical testing Capillary coiled-tubing testing Cement analysis Customized chemicals Drilling fluids testing Formation characteristic analysis Formation fluid analysis Pipeline chemical development Production chemical development

Flow assurance Fracturing additives Odor control Pipeline chemicals Process chemicals Production chemicals Production intermediates Recycling chemicals Scale control—mechanical Wastewater & water treatment

Our investigative approachWeatherford Engineered Chemistry® experts identify the problem, select the right solution, apply the solution correctly, and then evaluate the results. Reducing yourcosts and increasing ROI are real results we strive for.

Our Engineered Chemistry offering gives you single-source quality control: problem-solving, chemical analysis, manufacturing, formulation, application—everything.

How muchdamage?

What isthe damage?

Formationdamage?

How wasit caused?

Selectsolution

Evaluateresults

Applysolution

SOLUTION

Is itaffecting

injectivity?

Is itaffecting

productivity?

Where isit located?

Formationdamage

identified

© 2012 Weatherford. All rights reserved.

Mutual Solvents

We work with you in reviewing the well files, including chemical and acidizing treatment history. We look for production-chemical incompatibilities (corrosion inhibitors, biocides, scale inhibitors) and review prior solvent selections that provided unsustainable incrementalproduction. Factors such as frequent hot-oiling, fluctuation of fluid levels, plant upsets and more all come into play. Once the challenge has been defined, Weatherford formulates a stimulation program, drawing from the WETSOL mutual solvents product line.

WETSOL mutual solvents

Field-proven benefits. Industry-recognized performance.Our Engineered Chemistry® services identify fouling mechanisms

Customize acid stimulation treatments with mutual solvents that enhance acid penetration.

In the process of increasing production with customized WETSOL systems, you’ll be reducing the need for workovers and avoiding lost production and downtime. Whether used as stand-alone treatments or pre-blended into various acid packages, WETSOL systems have an enviable track record in remediating skin damage in both hydrocarbon-bearing and water-injection wells.

Mutual solvents clean and disperse heavy hydrocarbons from formation rock surfaces. They act as non-emulsifiers to reduce surface tension and water-wet the formation. An accurate diagnosis of formation damage is vital in preparing an effective treatment program. Weatherford’s stimulation experts are highly trained and experienced in analyzing formation damage and customizing solutions.

WETSOL system applications• Pre-blended into various organic and inorganic acid packages

• Stimulation chemistry for removing water and condensate phase trapping in tight oil and gas wells

• Stimulation chemistry for breaking oil/brine emulsion blocks in reservoirs

• Prolonging time between workovers, accelerating payout

Corrosion-based Scale Mineral Scale

Oil Wet versus Water Wet

WETSOL 1, WETSOL 2, WETSOL 3, WETSOL AX 205 and WETSOL AX 207 are nonionic mutual solvents that contain no surfactants. These systems are compatible with virtually all formations and formation fluids. You can maximize permeability and achieve optimal production rates with a unique combination of properties in WETSOL systems that can acomplish the following:

• Water-wet formation fines

• Strip oil coatings

• Remove water blocks

• Reduce surface and interfacial tensions

• Prevent and/or break emulsions

• Reduce oil viscosity and sludging

• Maintain miscibility with other stimulation fluids

• Avoid absorption onto the formation face

• Remove damage induced by oil and water-based drilling or fracturing fluids

Symptoms of Formation Damage

• Sudden production decline not

consistent with reservoir depletion

• Injection decline

• Organic or inorganic deposition

• Fluctuation of fluid levels

Expert formation-damage diagnosis results . . . in targeted treatments for superior acid/mutual solvent performance

Oil-coated Scale

Engineered Chemistry®

Weatherford combines exceptional strength and experience in analytical chemistry and applications with an intimate knowledge of well construction, surface facilities and formation evaluation. This advantage gives us extraordinary insight in dealing with challenges posed by formation damage.

Our single-source capabilities ensure you of high-quality products and maximum efficiency of services. From research to manufacturing and product selection to distribution and application, we design and deliver custom chemical formulations that work. Discover how we can help you. Contact a Weatherford representative at weatherford.force.com/CPP.

weatherford.com © 2012 Weatherford. All rights reserved. 9438.00

The information contained herein was accurate and reliable to the best of our knowledge at the time this document was prepared. The material is supplied solely for information purposes, and Weatherford makes no guarantees or warranties, expressed or implied, with respect to its accuracy. Ensuring the completeness and accuracy of such information is the responsibility of the user of this product. Always consult the Material Safety Data Sheet for this product before use. Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford repre-sentative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford and may be registered in the United States and/or other countries. Weatherford products named herein may be protected by one or more U.S. and/or foreign patents. For more information, contact patents@weatherford.com. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.

Mutual Solvents