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Stimulating Unconventional Reservoirs: Maximizing Network Growth While Optimizing Fracture Conductivity - SPE 114173

StrataGen Engineering — Mon, 10 Nov 2008 00:00:00 GMT

Location:

Barnett, Fayettville, Woodford and other gas shale formations

Application/Technology Focus:

Matrix permeabilities of these shales are extremely difficult to measure because they are so low, but various approaches to determine their value have yielded permeabilities on the order of 1-100 nanodarcies.

Methodology:

Both mapping and modeling have been used to investigate the important role of natural fractures in both the stimulation and production processes, the importance of conductivity in the developed fracture or fracture system and the critical influence of the matrix permeability.

Client Value Results:

Economic production can be achieved only with an enormous conductive surface area in contact with this matrix, either through existing natural fractures or the development of a fracture “network” during stimulation. Economic production would then also rely on the existence or development of sufficient conductivity within this network

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Authors

N.R. Warpinski, SPE, M.J. Mayerhofer, SPE, Pinnacle Technologies; M.C. Vincent, SPE, Carbo Ceramics; C.L. Cipolla, SPE, and E.P. Lolon, SPE, StrataGen Engineering

Abstract

Unconventional reservoirs such as gas shales and tight gas sands require technology-based solutions for optimum development. The successful exploitation of these reservoirs has relied on some combination of horizontal drilling, multi-stage completions, innovative fracturing, and fracture mapping to engineer economic completions. However, the requirements for economic production all hinge on the matrix permeability of these reservoirs, supplemented by the conductivity that can be generated in hydraulic fractures and network fracture systems. Simulations demonstrate that ultra-low shale permeabilities require an interconnected fracture network of moderate conductivity with a relatively small spacing between fractures to obtain reasonable recovery factors. Microseismic mapping demonstrates that such networks are achievable and the subsequent production from these reservoirs support both the modeling and the mapping. Tight gas sands, having orders of magnitude greater permeability than the gas shales, may be successfully depleted without inducing complex fracture networks, but other issues of damage and zonal coverage complicate recovery in these reservoirs. As with the shales, mapping has proved itself to be valuable in assessing the fracturing results.

Introduction

Unconventional reservoirs provide a significant fraction of gas production in North America and increasing amounts in some other regions of the world. Such reservoirs include tight gas sands, coalbed methane (CBM), and gas shales; in 2006 these reservoirs provided 43% of the US production of natural gas (Kuuskra1). Because of their limited permeability, which is foremost among many other complexities, some type of stimulation process (and/or dewatering in the case of CBM) is required to engender economic recovery from wells drilled into these formations.

The focus of this paper is on gas shales, with particular emphasis on how these reservoirs perform relative to tight gas sands. The important role of natural fractures in both the stimulation and production processes, the importance of conductivity in the developed fracture or fracture system, and the critical influence of the matrix permeability are investigated using both mapping and modeling results.

Gas shales, such as the Barnett, Fayettville, and Woodford in North America, are relatively recent plays, but gas production from shales has occurred since the early 1900’s from the Devonian shales of eastern North America and more recently from the Antrim shale and others. These shales2 typically contain a relatively high total organic content (e.g., the Barnett has a total organic content of 4-5%) and are apparently the source rock as well as the reservoir. The gas is stored in the limited pore space of these rocks (a few per cent, including both matrix and natural fractures) and a sizable fraction of the gas in place may be adsorbed on the organic material. Matrix permeabilities of these shales are extremely difficult to measure because they are so low, but various approaches to determine their value have yielded permeabilities on the order of 1-100 nanodarcies. Clearly, economic production cannot be achieved without an enormous conductive surface area in contact with this matrix, either through existing natural fractures or the development of a fracture “network” during stimulation. Economic production would then also rely on the existence or development of sufficient conductivity within this network.

Download SPE Paper 114173

9-Nov-08 6:00 PM

Massive Hydraulic Fracturing Unlocks Deep Tight Gas Reserves in India (SPE 107337)

CARBO Ceramics — Fri, 09 Nov 2007 22:15:00 GMT

Location:

Northwest India (Rajasthan,) Raageshwari deep gas field

Application/Technology Focus:

Natural gas from a deep, tight formation was needed in order to heat and process waxy oil from a massive oil field discovered nearby.

Methodology:

Core testing, fluids compatibility testing, pre-fracture diagnostic injections, fracture simulation and post-stimulation production evaluation.

Client Value Results

Three deep gas wells in formations of varying permeability were stimulated successfully. Post-fracture well testing showed initial production rates agreeing with what was expected based on reservoir simulation. This important result supports the proposition that unconventional gas resources in Asian countries can be attractive when applying stimulation techniques perfected in other areas (i.e. North America).

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Authors

Josef Shaoul, Pinnacle Technologies; Michael Ross, Cairn Energy PLC; Winston Spitzer, Pinnacle Technologies; Stuart Wheaton, RISC UK Ltd.; Paul Mayland, BG Canada; and Arvinder Paul Singh, Cairn Energy PLC.

Abstract

Tight gas fracturing was pioneered in North America in the 1970's and 1980's, and also has a relatively long history in Germany. In the rest of the world, however, massive fracturing for production from tight gas formations (i.e. k < 0.1 mD) has been very rare, due mainly to poor economics, rather than lack of opportunities. A massive oil field was recently discovered in Rajasthan (northwest India). The field development would require significant amounts of natural gas for heating and processing of the waxy oil to be produced. The most economical solution to provide sufficient gas in this remote desert location was to produce it from a deeper formation discovered in the same area. The majority of the gas is contained in a volcanic section of basalts and felsics. A fracturing campaign was performed in 2006 on three deep gas wells to evaluate the post-stimulation production increase from a number of different horizons, with base formation permeability varying from 0.005 to 0.15 mD.

A comprehensive program of core testing, fluids compatibility testing and pre-fracture diagnostic injections was performed. Fracture stimulation treatments were performed in three different sections of this very thick gas-bearing formation (> 400 m gross height). The formations ranged from the highest permeability (0.15 mD) Fatehgarh sandstones, to a lower permeability Felsic section (0.05 mD) and the lowest permeability volcanic rock (0.005 mD). All three types of rock were stimulated successfully and post-fracture well testing showed initial production rates agreeing with what was expected based on reservoir simulation. This important result supports the proposition that unconventional gas resources in Asian countries can be attractive when applying stimulation techniques perfected in other areas (i.e. North America).

Introduction 

The Raageshwari Deep gas field was discovered by RJ-E-1 (Raageshwari-1) in 2003. It was the second well drilled on the Central Basin High (CBH), a 40km-long composite feature of elevated N-S-oriented fault terraces, arranged in echelon within the Southern Barmer Basin of Rajasthan (Figure 1). The Central Basin High (CBH) structure is divided into many major horst blocks, of which Raageshwari is the shallowest. Raageshwari Deep is a tight lean gas condensate field and is contained in an arrowhead-shaped horst block formed at the confluence of three fault trends and contains 4 reservoir bodies (Fatehgarh, Basalt, Felsic and Sub-Felsic).

Download SPE Paper 107337

©Copyright 2007. Society of Petroleum Engineers

9-Nov-07 4:15 PM

Improved Stimulation of the Escondido Sandstone (CARBO-authored)

CARBO Ceramics — Sat, 10 Nov 1979 01:00:00 GMT

Location:

Southwest Texas, Mesquite Field, Escondido Formation, polymer emulsion fluid, refracture

Application/Technology Focus:

Initial fracs using small sand volumes in low viscosity fluid doubled production, but rapidly declined to pre-frac rate.

Methodology:

Five wells were selected for refracturing with higher viscosity fluids, increased proppant concentration, larger proppant diameter and greater proppant mass.

Client Value Results:

Average production increase due to the refracs was 620%. Evaluation of pre and post frac flow rates and decline curves indicates an approximate doubling of recoverable reserves.

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Abstract

This paper presents the results of an effort to improve productivity of the low permeability Escondido Formation in Webb County, Texas, by the use of an improved hydraulic fracture design.

A fracture treatment using the polymer emulsion fluid system was designed to provide sufficient propped fracture length and area to maintain long-term productivity of the wells. The polymer emulsion fluid was selected for its good proppant transport and low fluid loss properties. Five previously drilled and stimulated wells and three new wells were fractured with the polymer emulsion treatments. Evaluation of pre and post frac flow rates and decline curves indicates an approximate doubling of recoverable reserves.

Introduction

The Mesquite Field is in Webb County in Southwestern Texas about 15 miles north of the town of Laredo. Drilling was started in the mid 1970s. The Escondido production occurs within a broad stratigraphic trap. Production from the wells on initial completion without stimulation is considered non-commercial. The Escondido is recognized to have significant potential for producing natural gas.

The wells in the Mesquite Field are located on approximately a 320 acre (127.5 hectare) spacing. However, well performance indicates that 160 acre (64.75 hectare) spacing may be more suitable for estimating reserves. Based on the 160 acre (64.75 hectare) spacing the wells contain an average estimated gas in place quantity of 1500 MMcf (4.25 E+07 m3).

It is evident that even though a good amount of gas is present, the production rate needs to be improved to make the wells commercial. Previous attempts to increase production with "conventional" gelled water fracs were partially successful, but rapid declines in production indicated that an improved stimulation treatment was necessary to maintain long-tern productivity.

Download Paper 7912

Authors: D.P. Kundert, Halliburton Services; D.E. Smink, Consultant

Paper: 7912

© Copyright 1979, American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Kundert, D.P., Halliburton Services; Smink, D.E., Consultant

9-Nov-79 7:00 PM

CARBO Introduces Innovative, Non-Radioactive Traceable Proppant

noemail@carboceramics.com — Mon, 28 Jun 2010 21:00:00 GMT

HOUSTON (June 28, 2010) – CARBO announced today the introduction of CARBONRT™, an innovative, environmentally responsible development in proppant placement. This technology incorporates a taggant that allows downhole, near-wellbore detection of ceramic proppant. CARBONRTassists in determining fracture propagation and geometry in a manner that is designed to optimize stimulation effectiveness and maximize productive capacity.

With non-radioactive CARBONRT, there is no half-life deterioration of the detectable properties. The proppant is engineered for extended identification, giving operators the flexibility of conducting post-frac logging months or years after fracturing.

The proprietary tracer can be added to any ceramic proppant in CARBO’s extensive product line. It is uniformly distributed through each grain of proppant, assuring consistent distribution of the traceable marker throughout the fracture zone.

“CARBONRTis a unique product that offers the E&P industry a traceable proppant without the half-life and potential environmental hazards involved with radioactive tracers,” said Gary Kolstad, CARBO’s President and Chief Executive Officer. “This provides flexibility to conduct proppant detection analysis with standard logging tools for an indefinite period of time.”

Company Information:
CARBO is the world's largest supplier of ceramic proppant for fracturing oil and gas wells; provider of the world's most popular fracture simulation software; and a provider of fracture design and consulting services. The company also provides a broad range of technologies for spill prevention, containment and countermeasures, along with geotechnical monitoring.

StrataGen's Brian Dzubin speaks to SPE - Gulf Coast Section about the Barnett shale

noemail@carboceramics.com — Sun, 27 Jun 2010 19:00:00 GMT

Brian will speak to the Completions & Production study group on Monday, August 23. The title of his talk is "It took years to get it, but we have another lesson from the Barnett shale!"

Click here to register: http://www.spegcs.org/en/cev/1748

CARBO Purchases Fracpro Software

noemail@carboceramics.com — Mon, 14 Jun 2010 16:00:00 GMT

HOUSTON (June 14, 2010) – CARBO Ceramics Inc. announced today that it has purchased all the intellectual property rights and trademarks for Fracpro® fracture design modeling software from the Gas Technology Institute.

According to CARBO President and Chief Executive Officer, Gary Kolstad, the purchase will allow continued development of the FracproPT software program along with additional well stimulation programs that complement the technology.

“The purchase of Fracpro software reaffirms CARBO’s commitment to our fracturing software business. We intend to continue development, expansion and evolution of the technology to provide our customers with more modern and efficient tools,” said Kolstad.

FracproPT is the most widely used fracture design modeling software in the world. It is used to design and optimize hydraulic stimulation operations, thereby increasing well production. Real-time capabilities allow it to be used before, during and after the job to analyze fracture effectiveness.

CARBO's Mark Chapman speaks about proppant to SPE Gulf Coast Section

noemail@carboceramics.com — Wed, 27 Jan 2010 17:00:00 GMT

Everything You’ve Always Wanted to Know about Hydraulic Fracturing Proppant... But Were Afraid to Ask!

Click here to register: http://www.spegcs.org/en/cev/1667

CARBO Announces Sigmund L. Cornelius Elected to Board of Directors

noemail@carboceramics.com — Tue, 17 Nov 2009 16:00:00 GMT

HOUSTON (November 17, 2009) -- CARBO Ceramics Inc. (NYSE: CRR) today announced the company's board of directors (Board) elected Sigmund L. Cornelius as an additional member of the Board. Mr. Cornelius is the Senior Vice President, Finance and Chief Financial Officer of ConocoPhillips and has over 25 years of experience in the oil and natural gas industry. Mr. Cornelius has also been appointed to the Compensation, Audit and Nominating and Corporate Governance Committees of the Board. We are pleased with the addition of Sig to our Board and look forward to gaining the value of his experience in the energy industry, said Gary Kolstad, President and CEO. He brings a wealth of expertise in global operations and has a deep understanding of finance and accounting principles, concluded Mr. Kolstad. CARBO is the world's largest supplier of ceramic proppant, the provider of the world's most popular fracture simulation software, and provides leading fracture design and consulting...

CARBO Ceramics Inc. Announces Acquisition of BBL Falcon Assets

noemail@carboceramics.com — Fri, 02 Oct 2009 15:00:00 GMT

Houston, Texas (October 2, 2009) -- CARBO Ceramics Inc. (CARBO) announced today that it has acquired through a wholly owned subsidiary the assets of BBL Falcon Industries, Ltd., a leading supplier of spill prevention and containment systems for the oil and gas industry. President and CEO Gary Kolstad commented, Falcon is an excellent addition to CARBO's current product and service offerings. We are excited about adding another growing business to CARBO, and are pleased that we will be selling Falcon's products and services to our existing client base of E&P and oilfield services companies. Falcon uses proprietary technology to provide value-added solutions that are designed to enable our clients to extend the life of their storage assets, reduce the potential for hydrocarbon spills and provide secure containment of stored materials. We believe these issues remain important as the oil and gas industry continues to increase its focus on environmental responsibility and compliance...

Optimizing production with Economic Conductivity

Tue, 27 Jul 2010 22:36:37 GMT

Using realistic downhole conditions helps maximize ROI.

There are basic models used to try to determine a well’s production capacity given a particular stimulation treatment. But the problem with simple models is that they are simply wrong.

CARBO engineers have developed a sophisticated analysis that factors in complex variables and downhole conditions such as closure stress, non-darcy flow, multiphase flow, fluid velocity and cyclic stress to determine the realistic conductivity of the reservoir.

The costs of hydraulic fracturing and other stimulation activities can then be assessed according to the corresponding increases in production, allowing producers to achieve the most cost-efficient production of oil and gas. This analysis is called Economic Conductivity^®.

As an example, more than 100 field studies showed that optimizing the choice of proppant increased fracture conductivity and well productivity by 20 to 30%, as well as increasing the estimated ultimate recovery (EUR) by 30%.

CARBO conducts Economic Conductivity analyses to individually optimize fracture treatments and deliver the best return on investment.

For additional information, see the Economic Conductivity site at http://www.economicconductivity.com/ .

Contact Us

Wed, 21 Jul 2010 18:44:27 GMT

Applied Geomechanics, Inc. 140 Chestnut Street San Francisco, CA 94111 +1-415-364-3200	Applied Geomechanics, Denver +1-303-883-1306 Jeff Keller, Marketing and Sales Manager
Applied Geomechanics, Boston +1-781-569-0001 John Tripp, Regional Services Mgr., Eastern USA Abe Hafiani, Senior Projects Manager	Applied Geomechanics, Chicago +1-847-910-3785 Tom Weinmann, Structural Health Monitoring Manager

List of Authorized AGI Representatives

Contact AGI:

500 Series

Wed, 21 Jul 2010 18:44:10 GMT

Model 520 Geodetic Platform Tiltmeter Our top performer for surface applications, Model 520 is designed for projects demanding maximum resolution and stability. Applications include leveling and alignment of platforms and antennae, measurement of earth tides and crustal deformation, and volcano monitoring. With resolution finer than 10 nanoradians, Model 520 is excellent for use in all static tilt applications, or as a sensitive long-period accelerometer. Each system includes the tiltmeter, a rugged fiberglass switch box and a 3-meter interconnect cable. Select among three gains and two low-pass Butterworth filters using switches in the switch box. Leveling and user calibration of the tiltmeter are performed with built-in micrometers or worm gear legs. Mechanical adjustment range is ±3 degrees. Specifications: Range (Biaxial) Low: ±1400 Middle:...

Wed, 21 Jul 2010 14:05:48 GMT

Low-cost, lightweight ceramic proppant CARBOECONOPROP is the most widely used ceramic proppant for a broad range of applications, especially suited for moderate depth natural gas and oil wells. Its bulk density and specific gravity are similar to frac sand, yet its high conductivity makes CARBOECONOPROP more cost-effective than resin-coated sands. CARBOECONOPROP is chemically inert, so it will not react with fracturing fluid crosslinkers and breakers. Features Developed for the largest well population. Bulk density and specific gravity similar to frac sand. High conductivity, making it more cost-effective than resin-coated sands. Chemically inert, will not react with fracturing fluid crosslinkers and breakers. Available in two standard sizes - 20/40 and...

Tech Notes

Fri, 16 Jul 2010 15:29:09 GMT

Acceleration Effects on Tilt Measurements Computation of Cross-Axis Tilts Effect of Cross-Axis Inclination Effect of Magnetic Fields on Our Tilt Sensors Glossary of Useful Terms Impulse Response of 900-Series Biaxial Clinometers with Viscous and Non-Viscous Sensors Impulse Response of the 59579-02 Wide-Angle Sensor Installing Surface Mount Tiltmeters Measuring and Removing Tiltmeter Bias Measuring Temperature with 4-20 mA Tiltmeters MTBF of 700-Series Platform and Surface Mount Tiltmeters Radiation Tolerance of Applied Geomechanics Tilt Sensors Settling Behavior of 757-Series Miniature Tilt Sensors Settling Time of 900-Series Biaxial Clinometers Settling Time of Model 84053 Ceramic Sensors Tilt Temperature Coefficients Tiltmeter Basics Using Tiltmeters as Precision Levels Using Tilt to Measure Displacement Worm Gear Ratio of Model 520 Geodetic Platform Tiltmeter Legs

Improve performance with hands-on software training.

Fri, 16 Jul 2010 15:16:05 GMT

Learn to optimize the powerful capabilies of FracproPT and StimPT™. For software with the comprehensive capabilities of FracproPT and StimPT, effective training is essential to get the most from your investment. FracproPT Fracture Analysis Course Please join CARBO's industry acknowledged experts in a course designed to provide both the background fundamentals of hydraulic fracturing and hands on software training in the design and analysis of fracture treatments. These three-day courses run through mid-week, allowing you sufficient time for traveling and office duties. The course is limited to 15 participants and each student will need a laptop computer. Course Benefits The course concentrates on the design and analysis of hydraulic fracturing treatments using real-world examples. The class examples cover a wide range of hydraulic fracturing applications and geographical locations, ranging from tight...

Providing software users with all-important support

Fri, 16 Jul 2010 15:15:30 GMT

We're here to help you get the most from FracproPT and StimPT™. The engineers and developers of FracproPT and StimPT™ are working to constantly improve the capabilities and performance of our software. As direct measurements of fracture growth in various rock formations become available, we incorporate them into FracproPT's default models and calibrated model settings for the specific formations. As a result, users improve their capability to predict fracture growth, leading to better job design and execution. For users of FracproPT and StimPT, email and extended phone support are standard, provided by staff engineers and technicians. Contact Customer Support (FracproPT or StimPT) Call +1 (281) 921-6500 or submit your question online. FracproPT features annual major upgrade releases. Service packs can be downloaded over the web, and users are automatically notified when they become available. Software Installation...

Getting the most out of any reservoir

Wed, 14 Jul 2010 19:25:54 GMT

CARBO's experience and expertise are unmatched. CARBO Ceramics proppants are engineered to optimize conductivity in virtually any application. No other manufacturer comes close to our comprehensive line of high-quality products. Lightweight ceramic proppant for slickwater fracturing Tech Sheet (PDF) | MSDS (PDF) Low-cost, lightweight ceramic proppant Tech Sheet (PDF) | MSDS (PDF) Lightweight, high-performance proppant, ideal for oil reservoirs Tech Sheet (PDF) | MSDS (PDF) Intermediate-strength proppant, frequently selected for moderate depth oil and gas wells Tech Sheet (PDF) | MSDS (PDF) High-strength sintered bauxite proppant for deep and hostile downhole environments Tech Sheet (PDF) | MSDS (PDF) Identifies the precise well or fracture stage that flows back proppant Tech Sheet (PDF) Non-Radioactive Traceable proppant...

Wed, 14 Jul 2010 19:20:29 GMT

Non-Radioactive Traceable proppant CARBONRT is an innovative, environmentally responsible, technological breakthrough in proppant placement. It is the industry's most effective detectable proppant due to its combination of safety and conductivity. Features Identifies the proppant coverage (stimulated interval) as well as propped frac height. Proprietary chemical tracer is uniformly distributed through each grain of proppant during the manufacturing process. Use in any well, anywhere - the detectable taggant can be added to any proppant in the extensive CARBO line without altering proppant performance characteristics. Advantages No shelf-life or half-life issues - logging can be conducted anytime during the...

Tue, 13 Jul 2010 17:02:28 GMT

Fracpro^®PT: The power to optimize performance

The world’s leading fracture stimulation software offers unparalleled capability, versatility and real-world performance.

Fracpro^®PT is a comprehensive software package that offers users more resources, more flexibility, more analytic capability and more effective ways to boost ROI than any other.

FracproPT contains four fully integrated modules for Frac Design, Frac Analysis, Economic Optimization and Reservoir Performance. It can model almost limitless combinations of well configuration, proppant placement, conductivity improvements and fracture dimensions, in any type of reservoir.

In addition to its thorough built-in libraries, FracproPT can capture data and be calibrated in real time, allowing users to customize models for their specific application.

With unmatched features, application and performance, it’s no wonder that FracproPT is the industry standard hydraulic fracture simulation softwares.

More about FracproPT

Lorem ipsum survey

noemail@carboceramics.com — Thu, 02 Apr 2009 16:57:58 GMT

Objectives:

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Release Date: 2-Apr-09 11:57 AM
Expiration Date: 2-Jul-09 11:57 AM

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Lorem ipsum

2009-04-02T16:57:58Z

Instructor: Instructor

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CARBO RSS Feed

Stimulating Unconventional Reservoirs: Maximizing Network Growth While Optimizing Fracture Conductivity - SPE 114173

Location:

Application/Technology Focus:

Methodology:

Client Value Results:

Authors

Abstract

Introduction

Massive Hydraulic Fracturing Unlocks Deep Tight Gas Reserves in India (SPE 107337)

Location:

Application/Technology Focus:

Methodology:

Client Value Results

Authors

Abstract

Introduction

Improved Stimulation of the Escondido Sandstone (CARBO-authored)

Location:

Application/Technology Focus:

Methodology:

Client Value Results:

Abstract

Introduction

CARBO Introduces Innovative, Non-Radioactive Traceable Proppant

StrataGen's Brian Dzubin speaks to SPE - Gulf Coast Section about the Barnett shale

CARBO Purchases Fracpro Software

CARBO's Mark Chapman speaks about proppant to SPE Gulf Coast Section

CARBO Announces Sigmund L. Cornelius Elected to Board of Directors

CARBO Ceramics Inc. Announces Acquisition of BBL Falcon Assets

Optimizing production with Economic Conductivity

Using realistic downhole conditions helps maximize ROI.

Contact Us

500 Series

Tech Notes

Improve performance with hands-on software training.

Providing software users with all-important support

Getting the most out of any reservoir

Fracpro®PT: The power to optimize performance

The world’s leading fracture stimulation software offers unparalleled capability, versatility and real-world performance.

Lorem ipsum survey

Lorem ipsum

Introduction 

Fracpro^®PT: The power to optimize performance