Method for delivering devices into well and device for realization of said method

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.

EFFECT: higher efficiency.

3 cl, 1 dwg, 1 tbl

 

The invention relates to the oil and gas industry and can be used in technology delivery devices into the hole on the cable.

Known methods and devices for delivery of devices in the hole on the cable, which consists in transporting into the well attached to the cable of the devices under its own weight devices and cable (see, for example, Ehink, Vaibhasika. Equipment and tools for repair of wells. M.: Nedra, 1991, s-228).

A disadvantage of the known methods and devices of the delivery devices in the hole is that they do not provide delivery devices in horizontal wells. The reason is that with increasing depth of the instrument in the borehole increases the buoyancy force from the increased fluid pressure in the borehole, and that the devices and the cable in areas of large curvature lie on the pipe wall and their weight is directed vertically down, can't move the device away from the vertical.

This disadvantage is eliminated in another known method of delivery devices into the well and the device for its implementation adopted for the prototype (see, for example, Sealing, Vineburg. JSC Permneftegeofizika. Study of horizontal wells in the Permian region // NTV “Carotenic”. Tver: AIS, 2002, VIP, pp.86-91).

Method of delivery the device is in the well of the prototype includes the choice of cable required rigidity and weight, the fastening devices on the cable and transporting them into the well under the weight of the devices and cables.

Device for delivery of the devices in the well of the prototype contains cable required stiffness and weight with a fixed devices.

The disadvantage of the prototype is that to increase the rigidity of the cable using solid or composite cable of large diameter and heavy weight, which creates difficulties seal cable lubricator to the wellhead and the difficulties of zataskivanija cable into the well when the pressure on the mouth, since the buoyancy force is proportional to the cross section of the cable. As a result of such problems increases the time of delivery devices in the well, which reduces the effectiveness of the technology and, consequently, productivity.

The objective of the invention is to increase the efficiency of the method and device for delivery of the devices in the hole on the cable.

The technical result achieved when using the proposed group of inventions is to increase the stiffness of the cable to the appropriate value without increasing the diameter of the cable and without increasing its weight.

This technical result is achieved in that in the method of delivery of the instrument in the borehole, including the choice of cable required stiffness and weight, the fastening devices on the cable and the TRANS is armirovku into the borehole under the weight of the devices and cable according to the invention the cable select with inner sealed tube before lowering the cable into the borehole sealed tube plugs at both ends, is injected into the tube fluid under pressure through a check valve and leave it under pressure for a period, and then put the cable with a fixed devices in the well, while the magnitude of the fluid pressure in the tube is determined from the formula:

where Rtubesthe fluid pressure in the tube, kgf/cm2;

PSLE- the hydrostatic pressure of the column of well fluid at the depth of the planned descent devices on the cable, kgf/cm2;

SKAB- cable cross section with a pipe, cm2;

Stubes- the cross-sectional area of the orifice tube and equal size of the tube in contact with the liquid in the tube, cm2;

QKAB- weight of 1 km of cable with tube, kgf;

LKAB- cable length to the depth of the planned descent devices, km;

Pbitthe fluid pressure in the tube leading to the rupture of the cable, kgf/cm2defined by the formula:

where Rbit- breaking strength of the cable according to his passport, kgs.

This technical result is achieved by the fact that the device for implementing the method of delivery ol the hog into the well, contains cable required stiffness and weight with a fixed devices according to the invention, the cable includes an inner sealing tube mounted on the ends of the tubes in the upper tube is shut-off valve through which the tube between tubes pumped liquid left under constant pressure during operation, the pressure of the fluid in the tube is defined by the formula (1).

That cable has an internal sealed tube installed at the ends of the tubes in the upper tube is shut-off valve through which the tube between tubes pumped liquid and leave it under constant pressure during operation, allows you to create tensile stress at the same time on the tube and on the cable due to fluid pressure on the tube in opposite directions. However, the greater will be the pressure of the liquid in the tube, the greater the tensile stress on the tube and the cable. When the shutter release cable with devices such as in vertical wells or horizontal or inclined wells on the receiver and cable, there is an additional tensile stress from the weight of the cable tube and instruments whose value is proportional to the length of the cable. Weighing devices and friction cable and devices on the walls of the wells can be neglected due to their small values compared to besombes, their insignificant impact on the rigidity of the cable and mutually compensating action of the weight of the devices and the specified friction.

In addition, the lower tube tube hydrostatic pressure of the liquid column in the tube equal to the hydrostatic pressure of the well fluid PSLEat any point in the well. This pressure also stretches the tube and the cable, as the second end of the cable attached to the winch drum.

The action on the cable specified tension to the cable becomes like a stretched string and acquires a certain rigidity, preventing it from folding vertically in the borehole when the force moving it pumped fluid in the horizontal and inclined and in a vertical well. In horizontal well stretched by hard efforts cable is lowered to a greater depth than no stretching, so as rigid cable is not folded and promotes the devices in the horizontal part of the well. As can be seen, the rigid cable is not formed in any well. Because the diameter of the cable with the small tube and to increase the rigidity of the cable to increase the diameter is not required, then at the wellhead buoyancy force is too small and it is easier to overcome than using a cable of large diameter, since the buoyancy force increases in proportion to the atrato cable diameter.

Tensile strength cable with a pipe joint action of fluid pressure in the tube, the hydrostatic pressure of the liquid column in the tube, and the weight of the cable with tube counteracts the buoyancy force arising from the pressure of the downhole fluid at the end of the cable or its projection on the end face of the device, increasing in proportion to the depth of the borehole, that is in proportion to the length lowered into the well by a cable.

In order for the cable down into the well in the delivery of its devices, it is required that the tensile his strength was equal to the buoyancy force or exceeded.

Formulae (1) and (2) are derived from conditions exceeding the tensile forces from the joint action of the fluid pressure in the tube, the hydrostatic pressure of the liquid in the tube and the weight of the cable above the buoyancy force arising from the action of the pressure of the well fluid at the end of the cable or its projection on the end face of the device.

The specified condition is:

where Fdvlv tube=Ptubes×Stubes- tensile force of the cable with the tube by fluid pressure in the tube, kgf;

Phydrostat. in the tube=PSVK×Stubes- tensile force of the cable with tube hydrostatic pressure of the liquid column in the tube is proportional to the depth of the descent is ribarov, kgf;

Fcable weight=QKAB×LKAB- tensile force of the cable from the handset to the weight of the cable with tube, is proportional to the length of the cable is lowered into the well, kgf;

Pvitalk=PSVK×SKAB- eject force from the hydrostatic pressure of the column of well fluid, proportional to the depth of the cable running from the devices on the end of the cable or its projection on the end face of the device, kgs.

After substitution in the formula (3) these values of the forces we obtain the following inequality which provides delivery devices in different wells:

From inequality (4) after his conversion as defining the fluid pressure in the pipe Ptubesby the formula (1).

The obtained value of the fluid pressure in the tube provides delivery devices in vertical, horizontal and inclined wells.

To protect the tube from possible rupture of high pressure fluid Ptubesa restriction of this pressure, which must be less than the burst pressure Pbit. Burst pressure Pbitdetermined by razryvnaya force of the cable is shown in the passport of the cable, by dividing this force by the cross-sectional area of the orifice tube. Such a formula to determine Pbit it follows from the above formulas (4) to determine the tensile strength of the cable with the tube by fluid pressure in the tube. If instead of Fpressin the tubeto put the value of the disruptive force of the passport of the cable, then Fthe pressure in the tube=Fbitand Rtubes=Pbit. From this equation and obtained a value of Pbitabove in the formula (1).

The proposed device allows delivery devices into the well, shown in the drawing, which shows its longitudinal section.

A device for implementing the method of delivery of the instrument in the borehole contains the cable 1 with internal sealed tube 2 are installed on the ends of tubes 3 and 4. In the upper tube 4 is located off valve 5, through which the tube 2 between the tubes 3 and 4 pumped liquid 6. At the lower end of cable 2 is installed devices 7.

The device operates as follows. Before descending into the well of the cable 1 with internal sealed tube 2 clog the tube 2 with both of its ends by plugs 3 and 4. Through a check valve 5 into the tube 2, the liquid 6 under pressure and leave it under pressure during operation. Then put the cable 1 with a fixed devices 7 in the hole. Pressure value of the fluid 6 in the tube 2 Rtubesdetermined by the formula (1).

Initial data for calculation of Pt the UB by the formula (1) and the analysis results of the calculations are shown below in table 1 and under the table.

Liquid 6, which is under design pressure acts upon the tube 3, and 4 and creates a tensile stress on the tube 2 and connected with the cable 1.

Simultaneously, the cable 1 extends its weight and increases the hydrostatic pressure of the liquid 6 at the end of the tube 3. Counteracts the tension of the cable buoyancy force equal to the product of the pressure of the well fluid at the end of the cable or its projection on the end face of the device and the cross-section of the cable 1.

When the excess of the tensile cable 1 power on push the power cable 1 acquires additional rigidity and is not formed during the descent of the cable 1 in the horizontal and inclined wells or deep vertical, allowing you to deliver the devices 7 in any well.

To increase the diameter of the cable 1 to increase its rigidity is not required. Therefore, the buoyancy force does not increase and to overcome the resistance of zataskivanija cable into the well requires less effort.

Table 1

The effectiveness of the delivery instrument into the borehole increases.
№№PSLE,kgf/cm2SKABcm2dtubesmmStubescm2QKAB, kgfPbitkgf/cm2Ptubeskgf/cm2LKABkm
110011,315.30,224,353327272,7333,90,01
211011,315,30,2243,53327272,7183,950,1
312011,315,30,2287,06627272,7the 13.40,2
415011,315,30,22217,66527272,7-498,5450,5
520011,315,30,22435,3327272,7-1351,591,0
630011,315.30,22870,6627272,7-3057,682,0
7400 11.315,30,221305,9927272,7-4763,773,0

Calculations of Ptubesentered in the table represent the following:

with regard to the possibility of emissions of gases and of oil from a reservoir, the calculations are performed for the pressure of the fluid at the wellhead PSLE=100 kgf/cm2, which is included in the depth of the borehole;

it turns out that the greatest pressure of the liquid in the tube Rtubesyou want to create in the initial period of the cable running from the lubricator into the well, when the weight of the cable is not yet valid. But the pressure must be maintained to a depth of cable running about 200 m, although smaller values;

take into account that when cable entry devices in a horizontal or vertical well, the same thing happens as on the mouth, namely the weight of the cable does not stretch the section of the cable lying on the borehole wall, but pushes this site. If this section of the cable will be stretched by the pressure of the liquid in the tube to ensure the rigidity of this section, the cable will move in a horizontal or inclined wells exactly the same as at the entrance of the cable into the hole on her mouth, when the weight of the cable is not yet available;

given the accepted value of constant fluid pressure in the tube at the period p is bots exceeding the calculated value 333,9 kgf/cm 2a suggested value of hydraulic losses: Ptubes=350 kgf/cm2;

for the specified cable ⊘ and 11.3 mm with tube ⊘ 5.3 mm recommended passport maximum working pressure is 400 kgf/cm2. As can be seen, the calculated value 333,9 kgf/cm2and the received pressure Ptubes=350 kgf/cm2do not exceed neither recommended nor burst pressure;

a negative value of Ptubesmeans that at depths greater than 200 m, the action of the weight of the cable does not require action of the pressure in the tube for vertical wells. However, for horizontal and vertical wellbores pressure Ptubesrequired, as at the mouth of wells.

1. The method of delivery of the instrument in the borehole, including the choice of cable required stiffness and weight, the fastening devices on the cable and transporting them into the well under the weight of the devices and cable, wherein the cable select with inner sealed tube before lowering the cable into the borehole sealed tube plugs at both ends, is injected into the tube fluid under pressure through a check valve and leave it under pressure for a period, and then put the cable with a fixed devices in the well, while the magnitude of the fluid pressure in the tube is determined from the formula

Ptubes≥PSLE(SKAB tubes-1)-QKAB×LKAB/Stubes<Pbit(1)

where Rtubesthe fluid pressure in the tube, kgf/cm2;

PSLE- the hydrostatic pressure of the column of well fluid at the depth of the planned descent devices on the cable, kgf/cm ;

SKAB- cable cross section with a pipe, cm2;

Stubes- the cross-sectional area of the orifice tube and equal size of the tube in contact with the liquid in the tube, cm2;

QKAB- weight of 1 km of cable with tube, kgf;

LKAB- cable length to the depth of the planned descent devices, km;

Pbitthe fluid pressure in the tube leading to the rupture of the cable, kgf/cm2defined by the formula Rbit=Fbit/Stubeswhere Fbit- breaking strength of the cable according to his passport, kgs.

2. A device for implementing the method of delivery devices into the well containing the cable required stiffness and weight with a fixed devices, wherein the cable includes an inner sealing tube mounted on the ends of the tubes in the upper tube is shut-off valve through which the tube between tubes pumped liquid left under constant pressure during operation, the pressure of the fluid in the tube ODA is divided according to the formula of claim 1.



 

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