Day 2 3 operational aspects quality control and safety matrix acidising

Opera&onal considera&ons for a s&mula&on treatment... S&mula&on opera&ons with coiled tubing... Chemical storage Tool shed Job control center Fluid storage Proppant storage Surface fa

Day 3: Operational aspects 

Opera&onal considera&ons for a  s&mula&on treatment 

Cement quality 

Pressure limita&ons 

S&mula&on opera&ons with   coiled tubing 

Pumprates and fracturing 

Perfora&ons 

Corrosion concerns 

Planning and scheduling 

Chemical storage Tool shed

Job control center

Fluid storage

Proppant storage

Surface facilities, vent line, etc

High Pressure Area

to marked with e.g red tape

Rest area, toilets, muster point, etc

Wellhead

Prevailing wind direction

HP Pumps and manifold

Blending

Annulus pressurizing unit

Lay‐out of equipment 

Site prepara&on‐offshore 

Job execu&on 

Quality control 

Time required for Explor well Development

well

Well in mature (one-off job) area (Campaign)

1 Data gathering 1 - 2 days 1 - 5 weeks 1 day

(incl lab tests)

2 Treatment design 1 day 1 - 2 days 0.5 days

3 Notification/ 1 day 1 - 2 weeks 1 day

discussions with

contractor

4 Tendering 1 - 2 days 1 - 2 weeks 0.5 days

5 Arranging material 1 - 2 days 2 - 3 days 1 day

and equipment

6 Preparing well/ 0.5 days 1 week 1 day

Logistics

7 Job execution 1 day 1 day 1 day

8 Back-production/ 1 - 3 days 1 - 3 days 1 - 8 weeks measuring results

9 Evaluation 1 day 1 week 1 - 2 months

Planning Guidelines for Matrix Treatments 

!  Keep all unnecessary staff off site during pressure testing, pumping, and perforation operations 

!  Hold a safety meeting prior to the treatment  with all personnel on location 

!  For critical jobs or with new, relatively inexperienced crews, hold dry runs of critical operations 

Health, Safety & Environment  Considera&ons (cont.) 

!  Pressure test all lines prior to the treatment 

!  Determine the position of all valves and sequences of opening and closing of the valves 

!  Establish ‐ prior to the treatment ‐ handling and disposal procedures 

Resump&on of produc&on 

HSE aspects of s&mula&on 

General HSE guidelines for s&mula&on 

!  Matrix s&mula&on treatments are aimed at overcoming  the effect of near wellbore damage  

!  The skin factor used as a quan&ta&ve indicator of the  level of damage 

!  Pressure and injec&on rate data during a treatment to  es&mate skin factor change as a func&on of pumping 

&me.  

!  Real‐&me evalua&on or post‐treatment  

!  Theory of real‐&me monitoring of skin evolu&on  

!  Field cases to illustrate the applica&on of the method 

Acid response tests 

Optimum acid response after 90 PV

Or 0.4572 m3/m for a 1 * 1Ó core plug

Green is input

Permeability

Formation temperature

* Consider fracturing for low permeabilities!

Fluid Selection

Matrix Acidizing Volume 

Guidelines 

Paccaloni design chart for  monitoring acidizing 

̶   s, apparent

̶  s, damage

̶  s, viscous

& Job Execu&on 

!  Opera&onal constraints, scheduling, logis&cs,  site prep, etc. 

Treatment Evaluation &