The way to eliminate cross-flows of gas and water in oil wells

 

The invention relates to the oil industry and is intended to eliminate the flow of gas and water in the space surrounding oil wells. Provides a more effective way to eliminate cross-flows of gas and water in oil producing wells above the perforated interval of the wells without penetration of the insulation material into the reservoir across the perforated interval. The inventive lowered into the well cementing string of pipe. Served in the flow channels of the insulating material. Down in the grout column acoustic emitter. Influence of ultrasonic vibrations on the insulating material. According to the invention the acoustic emitter is used with sloped waveguides. Guide it to the depth of the upper holes perforating the production casing. Channel waveguides at an angle relative to the borehole wall in the direction of flow of the insulation material in the cracks behind-the-casing flows. Ultrasonic vibrations promote the penetration of insulating material on cracks up and do not initiate penetration of the material into the reservoir around the perforation interval below the acoustic emitter. 1 Il.

Aza and water in the space surrounding oil wells.

Known way to restore the tightness of the casing, which consists in the injection of the insulating material in the area of leakage in high pressure. The depth of penetration of the insulation material in small cracks and capillaries of the cement stone is determined by the pressure of injection [1].

The disadvantage of this method is that for penetration of the insulation material in cracks and capillaries of the cement behind the casing stone requires abnormally high pressure. At these pressures the insulating material is fed into the reservoir throughout its thickness, perforated.

Closest to the claimed technical solution is the ability to secure oil and gas wells, including the descent into the well cementing pipe string and the flow in the flow channels of the insulation material, the descent in the grout column acoustic emitter and the influence of ultrasonic vibrations on insulating material for high-quality insulation cracks and channels of cement [2].

In the known method of applying ultrasonic vibrations during the injection of the insulating material in the reservoir reduces the pressure zadavki. The disadvantage of the invention is that it does not solve the problem purpose fully the t intensive flow of material through the thickness of the layer, perforated.

The technical problem solved by the invention is to increase the efficiency of the method of elimination of cross-flows of gas and water in oil producing wells above the perforated interval of the wells without penetration of the insulation material into the reservoir across the perforated interval.

This objective is achieved in that way eliminate cross-flows of gas and water in oil producing wells, including the descent into the well cementing pipe string and the flow in the flow channels of the insulation material, the descent in the grout column acoustic emitter and the influence of ultrasonic oscillations on the insulating material according to the invention is used acoustic emitter sloped waveguides, guide it to the depth of the upper holes perforating the production casing and channel waveguides at an angle relative to the borehole wall in the direction of flow of the insulation material in the cracks cross-flows, and ultrasonic vibrations promote the penetration of insulating material on cracks up and do not initiate penetration of the material into the reservoir around the perforation interval below the acoustic emitter.

The essence of the aqueous tension and viscosity of the insulation material, moving through the capillaries of the cement stone. In addition, ultrasonic vibrations as would shrink separate volumes of liquid and push them through the cracks (the effect of ultrasonic impregnation) [3]. The pressure is about 100 times lower than would be required for the fluid without ultrasonic vibrations. For a more complete use of the energy of ultrasonic oscillations of the latter should be as oriented along the insulated cracks. Practically it is done installing waveguides at an angle to the borehole wall in the direction of flow of the insulation material in the cracks behind-the-casing flows. On the insulating material below the acoustic radiator of ultrasonic vibrations do not apply, i.e., not initiated entering into the layer of mortar across the perforated interval.

The drawing shows the layout of the downhole equipment to implement the method of the elimination of cross-flows of gas and water in oil producing wells.

Well 1 open gas 2 oil 3 layers, separated clay impermeable jumper 4. To prevent overflows of liquid and gas from the higher - and lower layers, the space between the wall of bore 1, exploitatio the oil from the reservoir 3 into the production string 5 and the cement stone 6 any punching holes 7. In the process of cementing or perforation occurs the destruction of the cement sheath cracking 8, including the interval between the gas 2 oil and 3 layers. For doing work on the elimination of cross-flows in the production casing 5 well 1 depth to top of perforation holes 7 down the string of pipe 9. At the wellhead 1 is set mouth fittings with valves 10 and 11. Column pipe 9 to the valve is mounted through the sealing device 12. Through the seal 12 in the column pipe 9 on the cable 13 down acoustic emitter 14 with waveguides 15, arranged at an angle less than 45oto his body. At the mouth of preparing the estimated amount of insulating material and is injected into the column pipe 9 through the valve 10. The valve 11 is open. Squeezing the liquid volume of the insulation material pressure pushing on the column 9 in the perforation interval.

Acoustic emitter 14 create ultrasonic vibrations contributing to the penetration of the insulation material in the cracks of the cement behind the casing stone. Insulating material moving exactly in the direction of the action of ultrasonic vibrations. After processing the acoustic emitter 14 column pipe 9 is pulled out of the borehole 1. Razvarivat is.

An example of performing the method, the Well is cased 146 mm production column. The perforation interval 3 meters Installed in the gas flow into the wellbore from the upper gas layer through the cementing of the production casing in the interval 4 m impermeable clay bridges between gas and oil reservoirs.

In the hole to the top hole punching down the column 73 mm tubing. At the mouth of the set valve. To reduce the need for insulating material in the borehole from the bottom to the top holes of the perforation can mouth to mamiwata sandy tube.

Prepare a solution, for example, cement petroleum-based estimated at 1.5-2.0 volume of the well from the sandy tube before the start of the perforation interval. For example: the volume of the prepared solution 0.03 m3the Assembly CA 320 is injected into the tubing and squeezing the liquid (oil, diesel fuel for cement petroleum-based push to exit into the wellbore. The string of pipe to pull 20-30 m to come out of it completely solution. Down acoustic emitter type PMS-16 with a resonant frequency of about 20 kHz, with a sloping (less than 45o) to the body of the waveguides. Power acoustic emitter is made from the station type is ti (oil, diesel oil) create and maintain the pressure at the mouth of the order of 0.5-2.0 MPa. Power acoustic emitter. Processing time is 2-4 minutes prior to the hardening of cement. The solution moves only in the direction of the action of ultrasonic vibrations (up from the perforated interval in the destruction of the cement stone for unperforated the production column). In the rest of the reservoir penetration of the solution by ultrasonic vibrations is not initiated.

Next, extract the acoustic emitter from the well and leave it under pressure to the solidification of the insulating material in the cracks of the cement stone. Then oil (diesel fuel) in the well change the fluid damping and extract the string of pipe tubing. Razvarivat and out of the wellbore cement and sand. Lower pumping equipment and the well is put into operation.

The advantage of the proposed method is based on the fact that the insulating material under the influence of ultrasonic vibrations fills all the pores and microcracks in the cement stone.

SOURCES OF INFORMATION 1. Restoring integrity casing strings in oil and gas wells: a series of "Drilling". - M.: VNIIEM, 1972, S. 49.

2. The copyright certificate of the CAS is xt-align:center; margin-top:2mm;">Claims

The way to eliminate cross-flows of gas and water in oil producing wells, including the descent into the well cementing pipe string and the flow in the flow channels of the insulation material, the descent in the grout column acoustic emitter and the influence of ultrasonic oscillations on the insulating material, characterized in that the applied acoustic emitter sloped waveguides, guide it to the depth of the upper holes perforating the production casing and channel waveguides at an angle relative to the borehole wall in the direction of flow of the insulation material in the cracks cross-flows, and ultrasonic vibrations promote the penetration of insulating material on cracks up and do not initiate penetration of the material into the reservoir around the perforation interval below the acoustic emitter.

 

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