Operators need to make efficient and smart business decisions, as they are constantly faced with long-term uncertainties in oil and gas prices and an anticipated decline in proven reserves. This makes it imperative to augment huge energy demand with reliable alternatives of which, Geothermal Energy source is one. The Netherlands, one of the leading countries that has employed this energy source, attest to the advantages and reliability that Quantum Downhole Systems technology brings to this market.
This case study highlights one of the Geothermal Well cleanout intervention strategies, which is to remove solids that block or eliminate flow of fluids in the well, hindering communication with the formation rocks. Previous conventional methods used to clean these wells to restore effective communication with formation rocks have been extremely unreliable due to the wellbore diameter and the need to circulate high volumes (1000s m3) of produced water and nitrogen. Additionally, these conventional methods could not guarantee circulation in many of the wells. Not only does the attempted circulation push solid materials from the wellbore into the pores near the casing/liner (again reducing communication), consequently lead to repeated and excessive intervention times.
With the 4th generation of Quantum’s patented JetVak™ system, a multi run JetVak cleanout program was developed for the Geothermal well to optimize its performance. The JetVak system ensures all solids are removed from the wellbore for an effective communication with formation regardless of downhole conditions and the completion type. Thus, achieve the proposed operational timeline and adequate utilization of the budgeted AFE.
This concentric Coiled Tubing (CCT) intervention comprised of four runs, executed on the HON-GT-01-S2 well for Green Well Westland. The scope of work was to open up the wellbore to provide the ability to conduct further diagnostic operations necessary to repair the well. The solids fill was to be removed using Quantum’s JetVak well cleanout system deployed on concentric coiled tubing. This well contained an excessive amount of solids; the entire well was filled with solids up 900 meters from the top. Total recovered sand from this well was 27 m3 plus a significant amount of unmeasured solid fines.
Each well is custom engineered from the top-down. This means a tailored approach to make the projects as cost efficient as possible, with the flexibility to allow for well cleanouts on budget using local service providers in locations where equipment and expertise are adequate. Once the project is in motion, all details of the cleanout are refined to work seamlessly. This includes Concentric Coil Tubing string (CCT), BHA, required Chemicals, etc. On site engineers use the latest technology to deliver a debris-free wellbore and develop the near-wellbore area and wellbore un-inhibited communication with formation for longevity.
In addition, Quantum’s focus on well optimization drives us to deliver the clearest picture for operators. Below is one of the many charts of post-operation of RIH#4 (Run-In-Hole #4) The downhole pressure and temperature recorder captures the well condition showing trend in increasing downhole pressure and temperature.
Quantum completed the job safely and efficiently and returned the wellbore to the operator, ready for final remediation work and return the wellbore to production.
QUANTIFIED RESULTS
Summary of JetVak 4 runs presented in previous page’s, highlight brief description of data obtained from each run. Note, amount of sand lifted in all runs was greater than the liner volume; about 400% of liner the liner volume. This certainly means that a significant amount of sand inflow into the liner occur during cleanout, a potential liner failure. Sand volume recovered on surface was ~4m3 (~48,000Kgs). This data forms the basis in determining remediation of liner integrity. It is noted that the returns of the four JetVak runs contain large amounts of fine grey solids, excluded from the sand totals in the chart but certainly amount to several cubic meters more.
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