Remedial cementing
DESCRIPTION OF THE TECHNOLOGY
Oil production technologies are the tools that allow extending the productive life of a well. We offer our proprietary effective solutions for a wide range of your tasks.
Application area
- Elimination of behind-the-casing flows;
- Sealing leakages in production string;
- Transition to overlying strata;
- Installation of isolation packers in oil and gas wells.
WORK STAGES
- Analysis of problems at the Customer's wells;
- Selecting a formulation with the maximum physical and chemical properties matching the Customer's conditions and range of problems;
- Submitting lab report on the formulation selection process, which is performed in downhole conditions of the Customer with provision of all the data on the selected formulation acquired using high-precision world class equipment (hardness, setting time, etc.);
- Selling a ready-to-use solution consisting of chemicals selected specifically to address the Customer's problems;
- Performing engineering works on well sites and training cementing crews of the Customer by qualified personnel.
USED TECHNOLOGIES
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MC-Rock™ Technology™
MC-Rock™ technology is a mixture of inorganic powders, with the grain size of 3 to 5 microns that are fed sequentially into the process water to obtain a solution with desired properties, which turns into a high-strength material in its turn.
MC-Rock™ formulations are selected depending on the static temperature in the squeeze cementing interval. Operating range of static temperatures in squeeze cementing interval lies between -5° С and 180° С. No factors other than static temperature in the squeeze cementing internal affect the compound.
The main distinguishing feature of MC-Rock™ is its penetrating capacity. Due to the fact that the maximum grain size of the components included into the composition of this technology ranges from 3 to 5 microns (which is comparable to grain size of micro-cements), penetrating capacity of MC-Rock™ technology compounds is several times higher than the capacity of conventional cements, such as class G cement, for example, with its grain size ranging between 40 and 60 microns.
In comparison with micro-cements, compounds based on MC-Rock™ technologies have a number of advantages:
- possibility to adjust the density of the compound from 1.2 to 2.15 g/cm³;
- high strength properties of the formulations. Standard compressive strength for any MC-Rock™ technology formulation of the Mirrico Group ranges from 30 to 50 MPa, and bend strength is from 10 to 15 MPa after 24 hours setting time;
- possibility of spreadability and rheology adjustment;
- linear expansion of the compound stone is from 5 to 10%, which positively affects the stone quality and service life of the repaired section of the well;
- MC-Rock™ technology formulations do not lose their setting features even in case of 50% contamination by drilling mud or other process fluids including those prepared on hydrocarbon base;
- thickening time can be adjusted in a broad range and can be up to several hours even with static temperatures equal to 180°С in the squeeze cement interval.
OJSC YANGPUR OIL COMPANY
- Description
Task: Elimination of behind-the-casing flows on the oilfield of OJSC Yangpur Oil Company.
Solution: Repair of leaking casing string (6 5/8") was performed on the Vyuzhnoe oilfield of OJSC Yangpur Oil Company.
Before the injection, the static fluid level (process water) was 213 m. Water pumping was performed at maximum pumping rate using CA-320 unit, which allowed to create overbalance of 2 atm. Well intake capacity – 16 m³ in 30 minutes. Intensive intake of process water was caused by a fault in 6 5/8" production string in the interval of 1132,4 – 1133,4 m confined to box coupling of the production string at the depth of 1133,2 m.
Results
In order to solve this problem, 5 m³ of specially selected MC-Rock™ compound was pumped in through the mule shoe of tubing 73 so that 2.4 m³ of the compound remained in the casing string and 2.6 m³ squeezed into formation for imbibition. Pressure test showed that the production casing was sealed. The well was successfully put into production.
RN - STAVROPOLNEFTEGAZ OOO
- Description
Task: Remedial cementing job in RN - STAVROPOLNEFTEGAZ OOO.
Solution: The remedial cementing job was performed with application of МС-Rock™ technology on the high-temperature wells of the Pushkarskoye oilfield.
Remedial cementing operations on this well were complicated by extremely high formation temperatures – the static temperature in the leaking interval reached 135 - 145°С. Due to the fact, that use of cement slurries, as well as resins, for this type of remedial cementing is impossible, application of MC-Rock™ system became the only solution to the problem. This technology implies the use of formulations suitable for work in extremely high temperatures when the average size of the system's particles equals to 5 microns.
Results
Remedial cementing was performed in four intervals of the well, and during those operations, the system confirmed all the declared properties and demonstrated a successful result. After drilling out all the bridge plugs and pressure test, MC-Rock wells were successfully submitted for putting in production.
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