Tag: HYDRAULIC FRACTURE PROFILING

05 Dec 2016

Fracture Monitoring

Fracture Monitoring

Optimize Wells to Improve Productivity and Reduce costs
Fracture Monitoring service provides real-time fluid distribution, fracture development and strain information to diagnose and optimize fracture treatments, well spacing, completion design, well design and reservoir development.
Using optical fibers permanently installed behind the casing, OptaSense's advanced Distributed Acoustic Sensing technology and Distributed Temperature Sensing helps you confirm successful completion operations, determine fluid and proppant distribution and monitor cross well communications in real time, at the perforation level by acquiring continuous acoustic and temperature measurements along the length of your well. This service also allows you to measure well interference, such as strain and temperature, on multi-well pads when one or more wells are instrumented with a fiber-optic cable. This data can provide valuable information on future well placement, perforation designs and reservoir development.

Hydraulic Fracture Monitoring Service

OptaSense’s frac monitoring service utilizes the most advanced Distributed Acoustic Sensing (DAS) and Distributed Temperature Sensing (DTS) technologies. Visualization of real-time distributed strain, temperature and acoustic data provides Operators with the information needed to optimize fracture treatments, evaluate diversion strategies, and identify cross well communication events. This novel sensing combination can offer real-time insights into:

  • Perforation cluster efficiency and distribution of fluid and proppant
  • Effectiveness of flow diversion
  • Well integrity issues
  • Initial flowback and well cleanout
  • Long term production and reservoir performance

Ready to optimize fracture performance?

Monitor completion operations

On-demand completion data not only provides the insight you need to optimize fracture programs, it allows you to mitigate operational issues in order to save completion dollars. To mitigate losses associated with mechanical failures, the Hydraulic Fracture Profiling service monitors all operations in real time, such as confirming perforations, plug setting, ball drops and sleeve actuation. It identifies unwanted inter-stage communication in treatment wells, as well as unwanted hydraulic connectivity in offset wells. Frac monitoring also enables the immediate detection and location of well integrity issues.

Identify cross well communications

With picostrain and milikelvin temperature sensitivity, our fracture monitoring service provides real-time displays of cross-well strain and temperature communication to identify Frac Hits while fracturing. This capability measures minute deformations of the casing caused by changes in formation strain near the wellbore induced by fracturing neighboring un-fibered wells. This powerful data set can be integrated with microseismic, production logs, geology, and other data to optimize stimulation effectiveness, well spacing and reservoir development strategies. Better understanding of fracture geometry from post-completion analysis can be used to calibrate hydraulic fracture models, improving future well and and completion design.

DxS screen image with DTS and DAS data during hydraulice fracture monitoring
Visualize the Effectiveness of Your Completion
Dig deeper into hydraulic fracturing data with the OptaSense DxS Pro visualization software. This software program allows operators to integrate multiple data sets, analyze DAS and DTS response during treatment, and generate 4D animations. It offers easy-to-use data processing and conversion tools, as well as application-specific workflows.

Did you know

By permanently installing fiber behind the casing, OptaSense Distributed Fiber Optic Sensing (DFOS) allows you to acquire borehole seismic data, profile hydraulic fractures and monitor production flow in real time, for the life of your asset.

This means while monitoring completion performance, you can visualize inflow and axial production flow along the entire wellbore, in real time, at the perforation level.

One system,
multiple applications

Related Links
13 Jul 2015

Monitoring Hydraulic Fracturing Operations Using Fiber-Optic Distributed Acoustic Sensing

Abstract

Taking downhole measurements during a hydraulic fracturing operation has many challenges, mainly the instrument survivability inside the hostile, high pressure, abrasive environment inside the casing during injection. Therefore, instrumentation must be attached on the outside of the casing, which has its own challenges in running-in-hole, cementing, pressure, etc. A fiber-optic cable with protective jackets can be permanently installed on the outside of the production casing and used to measure acoustics and temperature across the entire length of the borehole, without well intervention, for all operations from completions to production to abandonment. Fiber-optic distributed acoustic sensing (DAS) systems work by pulsing light into a fiber and measuring the backscattered light along the fiber length. An acoustic pressure wave that contacts the cable will create a small strain in the fiber and change the backscatter profile. The strain can be measured at surface, depth-matched using the speed of light in the fiber, and converted back into an acoustic signal. This paper will describe some of the acoustic events and signatures related to a typical plug-and-perf hydraulic fracturing operation including: wireline gun tracking, perforating, bridge plug setting, ball drops, and injection (axial flow and flow through perforations). Although this paper will only describe a typical signature of the listed activities, it will be evident that such continuous full wellbore measurements can be useful in redesigning and optimizing future operations, troubleshooting well problems, and making real-time operational decisions to avoid or mitigate non-productive time.

 

Click here to download the complete technical paper.

13 Mar 2012

Real-Time Downhole Monitoring of Hydraulic Fracturing Treatments Using Fiber Optic DTS and DAS

Abstract
In order to make commercial and development decisions effectively and more rapidly, new appraisal and testing technologies are needed to maximize early data collection and subsequent subsurface understanding as quickly as possible. For Unconventional Gas and Light Tight Oil (UGLTO) projects, some of this critical data can be derived from hydraulic fracture stimulation and inflow profiling activities.

For UGLTO projects, achieving an optimum hydraulic fracture stimulation is a continuous endeavor beginning as early as possible; and balancing the cost of completion vs. production performance is critical as the completion/stimulation is a large cost component of the well and heavily influences production rate/ultimate recovery. The fast paced development and introduction of new completion technologies requires diagnostic technology that can help us understand stimulation effectiveness, assess new completion technologies, and evaluate which zones are the most productive.

One emerging technology, fibre optic distributed sensing has the potential of providing key insights during both the hydraulic fracturing and initial flowback. The passive nature of fibre optic sensors allows intervention-free surveillance, which makes fibre-optic technology an effective platform for permanent sensing in producing wells. Until recently, the oil & gas industry fibre optic sensing technology has focused mainly on temperature (DTS) profiling along the wellbore. In 2009, it was first demonstrated how fibre optic distributed acoustic sensing (DAS) can also be used for downhole applications. Where hydraulic fracture diagnostics based on DTS alone in the past sometimes yielded ambiguous results, the combination of both acoustic and temperature sensing provides a step-change improvement in the ability to perform real-time and post-job diagnostics & analyses of the stimulation.

The different horizontal well case studies presented in this paper will illustrate how the combination of DTS and DAS has the potential to enhance the monitoring, assessment, and optimization of openhole and limited entry designed hydraulic fracture stimulation treatments.

Introduction
Given the low productivity of Unconventional Gas and Light Tight Oil (UGLTO) reservoirs (microdarcy permeability), the key element of successful exploitation is the ability to optimally create multiple hydraulic fractures to ensure sustained and high production rates are delivered during the production phase. Because the completion of a well can be the largest single well cost component, balancing the expense of hydraulic fracture stimulation versus the production benefits is crucial for the economic development of these reservoirs.

Real-time fracture monitoring in recent years has become a critical diagnostic tool for understanding hydraulic fracture deployment success in wellbores, leading to improved delivery and placement of the stimulation treatments. The diagnostics used have been primarily focused on determining the stimulation character such as fracture geometry, proppant placement in the fracture and fracture conductivity (Barree et al., 2002).

To better understand the complexity created by hydraulic fracturing treatments, composite fibre optic cables can be installed in a well to monitor the temperature profile as well as the acoustic signal distribution during completion operations (Paul Huckabee, 2009).

Click here to download the complete technical paper.