The method of processing bottom-hole zone of the reservoir

 

(57) Abstract:

The invention relates to the oil industry, in particular to methods of well stimulation using ultrasound effects on the bottomhole zone of the reservoir (PPP). The processing method of the PPP includes descent tubing (tubing) to the bottom. Before injection of the processing composition of the downhole fluid replace hydrocarbon liquid, such as anhydrous oil. The processing composition is injected and partially forced into the reservoir. The level of hydrocarbon fluid in the wellbore is reduced to the level at which the formation pressure and a half to two times the face. Under these conditions produce implosion effect. Then raise the tubing to the surface, the lower emitter of ultrasonic waves and conduct ultrasonic processing bottom-hole formation zone in the interval, from the bottom up, every meter of the perforated formation thickness. The method can be used on fields with low and normal formation pressure in the wells with the deterioration of reservoir properties of the bottomhole zone of the formation and development wells completed drilling and after major repairs. Stand what I'm to the oil industry, in particular to methods of complex treatment of bottom-hole zone (OPZ) layers, for example the influence of the processing compositions in combination with ultrasonic impact and can be used for the SCR with the purpose of stimulation of oil wells with low reservoir pressure at oil fields, which came in late stage development.

The known method OPZ well (see Handbook of Chemical reagents in the extraction and transport of oil”. Rahmankulov D. A. and other M, Chemistry, 1987, pp. 72-89), with the selection of the wells, which in operation has decreased technological and hydrodynamic parameters, as well as deteriorated characteristics of pump operation, the descent into the well tubing (tubing) to the soles of the processed layer, the injection of distillate (hydrocarbon composition), bring it to the reservoir, the displacement in the reservoir anhydrous oil well shutdown on technological restraint.

The advantage of this method is that, with the intensification of oil flow due to improved filtration properties of the layer.

The disadvantage of this method is that the cleaning efficiency of the bottomhole zone remains low, because it is only partial purification of paromomycin E. M. and other vibration wave and vibro-seismic methods of treatment of oil reservoirs. Survey information. Series “Oil business”, M, VNIIEM, 1989, S. 15-20), namely, that in the well in the productive interval of the formation install acoustic emitter and produce the layer processing.

The method allows you to clear the PPP from mechanical impurities, dirt, wax and salt.

The disadvantage is that ultrasonic treatment of the layer produced in the borehole fluid (oil or water), which has a low chemical activity. Moreover, if the bottom is water, which is often the case, the effect can not be reached. If the slaughter of oil, the obtained effect is also negligible, because it depends on the energy and structure of the ultrasonic emitter.

There is also known a method OPZ oil reservoir (see U.S. Pat. US No. 5184678, CL E 21 In 43/24, publ. 1993), including the descent of the tubing to the bottom of the well, the injection of the tubing string processing of the hydrocarbon composition, the lifting of pipes to the surface, the descent into the well and placing against the productive formation generator with pulse waves and the processing of bottom-hole formation zone of the hydrocarbon composition in the and in the environment of the processing composition is significantly higher than in oil or in water, due to the additional physico-chemical effects in the processing composition. However, the effectiveness of an integrated impact is reduced due to the fact that the process of impact covers minor near-wellbore zone, which is able to penetrate processing composition.

The closest in technical essence and the achieved result to the present invention is a method of processing bottom-hole formation zone (see U.S. Pat. RU # 2108452, CL E 21, 43/25, bull. No. 10 from 10.04.98, including the descent of the casing to the bottom, pumping them in the processing composition, the lifting of pipes to the surface, the descent into the well on a cable of the ultrasonic emitter and placing it against the processed interval of the layer, the layer processing by the ultrasound in the medium in the processing composition, in this case, before handling produce additional layer perforated casing in the interval of the productive formation in the environment of the processing composition. Ultrasonic treatment of the reservoir are at receipt processing composition into the reservoir and then from the reservoir into the well.

The method allows to increase the efficiency of processing composition in the reservoir due to the simultaneous complex vozdeistvuyushchego composition into the formation.

However, it is known that the majority of oil fields in the Russian Federation has entered the late stage of development, when the energy of the reservoir is significantly reduced, the processing composition is well into the reservoir and very poor returns from it. Re perforation in this case, promotes the penetration of the processing composition, and sometimes contributes to the increase of water production. Therefore, the processing efficiency is reduced and becomes short.

The technical objective of the proposed method of treatment of bottom-hole zone of the reservoir is to increase the efficiency of the integrated SCR due to the stimulation of oil wells with low reservoir pressure at oil fields, which came in late stage development.

This object is achieved are described by way of the SCR of the reservoir, including the descent of tubing to the bottom, pumping them in the processing composition, the rise of a pump kompressornyi pipes to the surface, the descent into the well and placing against the processed layer of the ultrasonic transducer and the processing layer of the ultrasound in the medium in the processing composition.

What's new is that before C is toplivo and so on), the processing composition is injected and partially forced into the reservoir, the level of the hydrocarbon fluid in the wellbore is reduced to the level at which the formation pressure and a half to two times higher than the bottom hole pressure, and in these conditions produce consistently implosion impact and ultrasonic processing bottom-hole formation zone, and ultrasonic treatment is carried out pointervalue, from the bottom up, every meter of the perforated formation thickness.

The method is as follows. Into the well to the artificial bottom, down the tubing string. Download commodity anhydrous oil annulus replace the downhole fluid in the full volume of the wellbore. When this happens bottomhole cleaning from dirt and water and the reduction in bottomhole pressure. Then the tubing is injected at the bottom and partially cut through the layer of processing composition. Then lift the Shoe of the casing in the interval, which will decline. The oil level in the well is reduced to the level at which the formation pressure exceeds the face twice. After this column tubing rises to the surface. Next on the cable in the area of the reservoir descends implosion cameranesi, then on the cable in the area of the reservoir descends ultrasonic emitter and is installed at the lower meter of the perforated formation thickness. Within 30-40 minutes is ultrasonic effect, then the emitter rises 1 meter above and again 30-40 minutes of ultrasonic treatment. And so on each meter perforated thickness of the productive formation. This SCR is completed, descends pumping equipment, and the well starts.

As a result of such complex effects on the bottomhole zone of the reservoir is full cleaning of the pore space from all types of impurities and their removal from the formation into the wellbore.

A specific example of the method

Test method conducted at well # 1280 Vendian deposits. Six months ago the well was processing was carried out on the prototype. Received an increase in flow rate at 1.5 t, which lasted 3 months. It was therefore decided to test the proposed method.

Geological-technical characteristics of the well.

1. The productive horizon To

2. Artificial slaughter 1760 m

3. The perforation interval 1745-1750 m

4. Reservoir pressure the economic level to 1300 m

8. Static level 250 m

9. Productivity ratio of 0.01 tons/day ATM

First extracted from a well pumping equipment. Lowered into the well the tubing to a depth of 1759 m At an open gate valve on the tubing with the pump unit CA-320 pumped into the annulus at the highest possible speed, without stopping, 20 m3commodity anhydrous oil. Switched the pump unit to the tubing string and open the valve on microbe pumped into the tubing and pushed in microbe to roof seam 6 m3hydrocarbon solvent “Nefras”. Closed the valve on microbe and oil pumping into the tubing pushed 2.5 m3Nefras in the reservoir. Picked up the Shoe of the casing in the interval 1100 m using swab reduced the level of oil in the well up to 1000 m picked Up the tubing string to the surface. Lowered into the borehole in the zone of the reservoir, on the cable implosion chamber, consisting of 2 pipe tubing and made implosive effect on the formation interval 1748 1746 and m Raised implosion chamber. Pulled on the cable of the ultrasonic emitter in the interval 1749,5 m Produced ultrasonic stimulation for 40 minutes Then produced ultrasonic exposure interval is vagina. After 10 days produced hydrodynamic research and established operational parameters work well (see table).

As you can see from the table, the figure increased to 3 t, the dynamic level increased by 550 m, the coefficient of performance increased from 0.01 to 0.09 is. After 6 months there were held the second hydrodynamic studies, which showed that the parameters of the well has not changed. Technical and economic efficiency of the proposed method OPZ productive formation is due to the stimulation of oil wells with low reservoir pressure at oil fields, which came in late stage development.

The processing method of the bottomhole zone of the reservoir, including the descent of tubing to the bottom, pumping them in the processing composition, the rise of the tubing to the surface, the descent into the well and placing against a processed layer of the emitter of ultrasonic waves and the processing layer of the ultrasound in the medium in the processing composition, characterized in that before the injection of the processing composition of the downhole fluid replace hydrocarbon liquid, for example, anhydrous oil processing composition Zack what toroi pressure in half twice downhole, under these conditions, consistently produce implosion impact and ultrasonic processing bottom-hole formation zone, and ultrasonic treatment is carried out pointervalue, from the bottom up, every meter of the perforated formation thickness.



 

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