RU2461700C1 - Well operation method - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: wing with bridge is lowered into the well, also perforated connection pipe, lower casing string of design length equal to distance from bore-hole pump location to the specified interval in side bore, connection pipe with side hole and plug. The end of down-hole pipeline is passed through connection pipe side hole, fix it in piston that has inner channel and side hole and having outer diameter providing the gap 3-4 mm between piston and inner surface of lower casing string for process fluid flowing. In the course of connection there formed is an interconnection of internal space of down-hole pipeline and internal channel and side hole in piston. The fluid is pumped through the lower casing string under the influence of which the piston and down-hole pipeline together with it is moved till stop against wing bridge. Filter down-hole pump and upper casing string are attached to the plug. The layout is lowered into the well with arrangement of wing, perforated connection pipe and lower casing string in well side bore. During descending down-hole pipeline is fixed at outer surface of upper casing string. The oil is extracted by bore-hole pump through upper casing string, process fluid is pumped into specified interval of side bore through down-hole pipeline, piston inner channel, side hole of piston, gap between piston and walls of lower casing string and perforates connection pipe.

EFFECT: possibility to deliver equipment and supply process fluid into well side bore.

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Description

The invention relates to the oil industry and may find application in the supply of a working agent in the interval of the side wellbore.

A known method of lowering the device into a well equipped with a downhole sucker rod pump, described when the device for descent. To study the wells, they are equipped with an eccentric faceplate, which serves to press the tubing string against one side of the casing wall. A shank is installed to the lower end of the tubing string below the pump, made in the form of a nozzle mounted on the tubing with free rotation around its axis, to which a ring is rigidly attached with an outer diameter smaller than the inner diameter of the casing by no more than the diameter downhole tool [USSR Author's Certificate No. 1346771, publ. 10.21.1988].

When implementing this method of lowering the device into the well due to the presence of slopes and bends in the wellbore, a gap is often formed between the protrusion of the liner and the wall of the casing and, as a result, the cable is overwhelmed in this gap. The indicated drawback can be caused either by the presence of permanent deformation of the cable in the form of a coil of a spring, or by sagging of the cable when the device is planted on the bottom.

Closest to the proposed invention in technical essence is a method of operating a well described in a device for transporting devices in a well comprising a housing with stop elements, travel stops and a drive with a screw and nut with supporting elements fixed to it, the device being provided with a spring, ring, and the drive nut is expandable, spring-loaded and covered by a ring installed with the possibility of interaction when moving with a stroke limiter [USSR Copyright Certificate 1465549, publ. 03/15/1989, prototype].

The reasons that impede the achievement of the technical result when using the known device include the fact that the known device does not provide the ability to deliver the object to the lateral barrel of a multilateral well, i.e. Using this device, you can feed an object into a well that does not have lateral branches.

The proposed invention solves the problem of ensuring the delivery of equipment and the supply of process fluid to the side wellbore.

The problem is solved by the method of operating the well, which consists in lowering a feather with a jumper, a perforated nozzle, a lower column of tubing of a design length equal to the distance from the location of the downhole pump to a predetermined interval in the lateral shaft, a nozzle with a side opening and a plug, the end of the downhole pipeline is passed through the side opening of the nozzle, fixed in a piston having an internal channel and a lateral hole and having an external diameter providing a gap of 3-4 mm between when connected and form the message of the inner space of the downhole pipeline and the internal channel and the side hole in the piston, fluid is pumped along the lower column of the tubing, under the action of which the piston is moved and together with him and the downhole pipeline all the way into the jumper of the pen, the filter is attached to the plug, the downhole pump and the upper string of tubing, the assembly is lowered into the importance of placing a pen, a perforated nozzle and the lower tubing string in the side wellbore, when lowering, the downhole pipe is fixed to the outer surface of the upper tubing string, oil is taken through the upper tubing string through the upper tubing string, through the borehole tubing , the internal channel of the piston, the side hole in the piston, the gap between the piston and the walls of the lower column of the tubing and the perforated nozzle are pumped into a predetermined sidetrack spacing process fluid.

SUMMARY OF THE INVENTION

During operation of a well with a sidetrack in the production string, deposits of salts, asphaltenes, paraffins, etc. can occur. This reduces the flow rate of the liquid and causes failure of the downhole pumping equipment. To prevent deposits, it becomes necessary to apply a scale inhibitor to the perforation interval. The task is complicated if the well has a sidetrack through which oil is produced. The proposed method solves the problem of ensuring the delivery of equipment and the supply of process fluid to the side wellbore. The problem is solved as follows.

Assemble the layout shown in figure 1.

A feather 2 with a jumper 3, a perforated pipe 4, a lower column of tubing 5, a pipe 6 with a side hole 7 and a plug 8 are lowered into the well 1, the end of the downhole pipe 9 is passed through the side hole 7 of the pipe 6, and is fixed in the piston 10 having the inner channel 11 and the Central hole 12 and having an outer diameter of 13, providing a gap of 3-4 mm between the piston 10 and the inner surface of the lower column of the tubing 5. On the bottom column of the tubing 5 pump liquid, for example water, One action which moves the piston 10 and with it the downhole pipe 9 all the way into the jumper 3 of pen 2. Above the plug 7, attach the filter 14, the deep pump 15 and the upper column of the tubing 16. Lower the assembly into the well with the placement of the pen 2, perforated pipe 4 and the lower string of tubing 5 in the lateral barrel 17 of the well 1. During the descent, the wellbore 9 is fixed to the outer surface of the upper string of the tubing 16.

The lower column of the tubing 5 is chosen to have a design length equal to the distance from the location of the downhole pump 15 to a predetermined perforation interval 18 in the side barrel 17.

For the flow of the process fluid during connection, a message is formed of the inner space of the downhole pipeline 9 and the inner channel 11 and the central hole 12 in the piston 10.

Oil is taken through a downhole pump 15 through a filter 14 and an upper column of tubing 16, through a borehole 9, an internal channel of the piston 11, a central hole 12 in the piston 10, a gap between the piston 10 and the walls of the lower column of the tubing 16 and perforated the pipe 4 is pumped into a predetermined interval of the side barrel 17 process fluid.

Concrete example

Operate an oil well with a sidetrack. The operation of the well is complicated by the deposition of salts coming, in particular, from the sidetrack along with the produced oil. For the operation of the wells assemble the arrangement in accordance with figure 1 and figure 2.

The perforation interval 18 in the lateral shaft 17 is at a depth of 1338 to 1342 m. The layout in the well 1 is placed so that the pen 2 and the perforated pipe 4 are at a depth of 1337-1338 m. Pen 2 is lowered into the well 1 with a jumper 3. The lower column tubing 5 has an inner diameter of 50 mm, the piston 10 has an outer diameter 13 of 47 mm. The lower tubing string 5 is selected at a length of 416 m, i.e. equal to the distance from the location of the downhole pump 15 to the perforation interval 18 in the side shaft 17.

Using a deep pump 15 through the filter 14 and the upper column of the tubing 15, oil is withdrawn with a flow rate of 12 tons / day. Through the borehole pipe 9 with a diameter of 4 mm, the internal channel of the piston 11, the central hole 12 in the piston 10, the gap between the piston 10 and the walls of the lower column of the tubing 16 and the perforated pipe 4 are pumped into the specified interval of the sidetrack 17 scale inhibitor brand SNPCH 53- 12 with a consumption of 25 g / t.

When operating the well for 2 years, there was no formation of scaling on the walls of the well and in-pump equipment.

The application of the proposed method will solve the problem of ensuring the delivery of equipment and the supply of process fluid to the side wellbore.

Claims (1)

The method of operating the well, which consists in lowering a feather with a jumper into the well, a perforated nozzle, a lower column of tubing of a design length equal to the distance from the location of the downhole pump to a predetermined interval in the side well, a nozzle with a side hole and a plug, the end of the well pipelines are passed through a side opening of the nozzle, fixed in a piston having an internal channel and a side hole and having an external diameter providing a clearance of 3-4 mm between the piston and the internal the surface of the lower column of tubing for the flow of the process fluid, when connected, form a message of the internal space of the borehole pipe and the internal channel and the side hole in the piston, fluid is pumped along the lower column of the tubing, under the action of which the piston and the borehole piston the pipeline all the way into the feather bridge, the filter, the deep pump and the upper tubing string are attached to the plug, the assembly is lowered into the well from During the descent, the borehole pipe is fixed on the outer surface of the upper column of the tubing, using the deep pump through the upper column of the tubing, oil is taken, through the borehole, the inner the piston channel, the side hole in the piston, the gap between the piston and the walls of the lower column of the tubing and the perforated nozzle are pumped into a predetermined lateral interval barrel process fluid.

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