Complex technology of enhanced oil recovery

EXPERIENCE IN COMPLEX TECHNOLOGY FOR STIMULATION WITH THE USE OF THE REAGENT PP AND GPD

Work for stimulation in wells, OOO." began in June 2002. For stimulation we used two technologies developed in INNOYL, OOO: raspisatsya bottomhole formation zone with application of responsereader reagent PP and impact on the formation of hydrodynamic pressure pulsator (GPD).

The introduction of these technologies was carried out in the field. (I horizon), because other objects in the design space Key, South Key, Uzun and dysh (II horizon) almost exhausted their energy potential and oil reserves.

A feature of the deposits of horizon I at the field. is its confinement to "sandy Bay", which has a greater length along the strike of 14.2 km and a very small lateral dimensions is 1.6 km away. incision of the monocline is characterized by the extensive development of the clay strata of the Maikop series, containing in the middle of several sand horizons are represented by alternating layers (from 0.3 to several meters thick) of gray quartz sandstones of different degrees of compaction neizvestnosti and dark gray clays. The thickness I of the horizon change from 180m to zero.

The roundness of clastic material weaknesses, dominated by angular and angular-rounded shape of the grains poorly sorted differences. The clastic materials are located in natural cement chaotically. Cement hydrologist, sometimes chloritized, montmorillonite-hydrologist and siliceous-clay.

The content of cementing substance is changed in the range of 5-25%. The content of up to 10% type of grouting film, contact, and more than 10% - there neparnoperistye, and basal pore cements. Shale and clay, dark-gray, brownish razmoyutsya weak or loose, non-carbonate. Their structure is layered, sometimes slate with puffs containing herbal and organic debris, mica or very thin (5 - 10 cm) layer of silt and aleurolite-sand differences. The presence of significant clay minerals with razboaie-mi packets gives them a high fluidounce properties.

In the period from June 2002 to may 2004. been processed 15 wells. Out of which 12 wells technology reagent responisble with the use of responsereader reagent PP, 2 wells, using GPD and 1 well – GPD + raspisatsya.

Of the 12 wells treated by a purification reagent raspisatsya on two wells No. 195 and 126 due to the low result produced re-of the upper pack of the I horizon.

Good results were obtained in the wells №№ 453, 159, 204 and 410, additional production on them was 857т, 1154т, 631т and 222т accordingly, well No. 453 and 159 serve in excess of the original de bit is already for 26 and 23 months, respectively, and the well 204 and 410 – 13 & 9 months.

A total of 12 wells treated by the method of reagent responisble 7 wells are in operation. Average monthly oil production rate for all wells (including failed treatments) increased in 2 times – from 20.5 tons/month. up 41.6 tons/month. Additional production from starting work until September 2004. with a set-3605т. The average additional production per 1 well is 300,4 t, the results are presented in table 1.All wells were processed without the involvement of the crews KRS and PRS, which minimizes the cost of processing. The success of the treatments is 83%.

It is generally accepted that acid treatment of the PPP and its variants are effective means to increase permeability of the bottomhole formation zone, but the reaction products remain in the PPP and continue to close the pore, preventing the passage of oil to the well bottom. To remove them apply a variety of methods: from simple washing, to use methods of the implosion and jet pumps. Basically, all these techniques are static in nature of impact on PPP, i.e. designed to create a depression on the layer. But a number of works shows that more effective methods are the methods of dynamic effects on the formation of alternating pressures.

To implement this method was developed hydrodynamic pressure pulsator GPD. When operating the GPD in the below-packer zone, there appears the phenomenon of alternating pressure fluctuations with an amplitude depending on the pressure differential on GPD, i.e., oscillations of the liquid column, which leads to fatigue failure of the PPP, the formation of cracks and removal of plugging material.

Three wells Nos. 366, 136 and 41 were treated with the GPD, and in well No. 41 was carried out comprehensive treatment - GPD+ raspisatsya, the results are presented in table 2.

Total of the three treated wells using GPD two wells are in operation. Average monthly oil production rate for all wells increased by 72% – 22T/month to 37.9 tons/month. Additional production from starting work until September 2004. made 1036т. The average additional production per 1 well is 345,3 T. Treatment of these wells was carried out in attracting the teachings of the overhaul teams.

As can be seen from the results of the treatments, the average additional production of wells treated with the use of technology responisble and technology GPD comparable and are respectively 300,4 tons/month and 345,3 tons/month.

The total additional production from the two technologies for the entire period was 4683т.

Conclusions:

1. Technology responisble with the use of responsereader reagent PP showed high efficiency at minimum cost, since its implementation was not required attracting crews KRS or PRS.

2. Technology GPD also showed high efficiency, but the cost is significantly higher, because its implementation involved a team of cattle.

3. In the implementation of this technology requires the use of liquid acids, which allows you to refuse the use of containers for storage of acids and acid units.

4. The ability to carry within the field responsiveui reagent RR conventional vehicles and provide storage at any indoor venues.

5. For more high performance technologies GPD, you need to use complex processing, i.e. carrying out of responisble and treatment of GPD. This comprehensive use of technology, gives better results.

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