CN2290692Y

CN2290692Y - Well cable-less frequency-conversion electrical heating oil extracting appts.

Info

Publication number: CN2290692Y
Application number: CN 97201525
Authority: CN
Inventors: 张崇荣; 脱丙杰; 徐占久; 张化圣; 王东; 许红梅
Original assignee: 张崇荣
Priority date: 1997-02-28
Filing date: 1997-02-28
Publication date: 1998-09-09
Anticipated expiration: 2007-02-28

Abstract

The utility model relates to an underground cable-less frequency-conversion electrical heating oil exploiting apparatus used for the exploitation of heavy oil and high-coagulation oil in oil fields. An insulated oil pipe is connected among the oil pipes of the device, an insulated centralizer is arranged on each of the oil pipes, a current conducting appliance is arranged between the oil pipes and a sleeve pipe, an insulated pumping rod is arranged between pumping rods, and a frequency-conversion voltage-regulating power source is communicated with the oil pipes. Current connects with the sleeve pipe by flowing across the current conducting appliance and then returns again. The oil pipes heated by the skin effect and the electromagnetic effect can heat the heavy oil to reduce the viscosity and break up the clogging, and can obtain the paraffin control of the high-coagulation oil. The utility model has the characteristics of simple structure, flexible control, quick heating, high heat efficiency, long service life, wide application range, low cost of equipment and production, etc.

Description

The down-hole does not have cable frequency conversion electrical heating extracting device of oil

The utility model relates to a kind of oilfield exploitation viscous crude, height of being used for does not have cable frequency conversion electrical heating extracting device of oil in the down-hole of oil with fixed attention.

Viscous crude and high coagulating in the exploitation of oil reservoir, the principal element that influences output is the viscosity of crude oil and the wax deposition problem in the tubing string.For viscosity reduction and prevent wax deposition, traditional oil production technology adopts the enclosed hot water circuit more, mixes thin oil and adds method such as chemical agent, in recent years, since the convenient and easy control of electric energy, various resistive heating devices, as auspicious triumphant cable heating, hollow rod electrical heating etc. are constantly come out.But auspicious triumphant cable costs an arm and a leg, and easily scratches or break cable when the oil well operation, causes short circuit or opens circuit, and is time-consuming, and there is insulating layer auspicious triumphant cable outside, and the capacity of heat transmission is limited, and thermal losses is big.Use the hollow rod electrical heating, its heat energy will be through could being absorbed by crude oil behind the insulating layer of heating cable, air, the hollow stem steel body, so set up temperature slowly, the thermal efficiency is low.Above-mentioned heating cable is owing to bear high temperature, and insulating layer is easily aging, influences application life, and the heating well depth is subjected to the restriction of cable length.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art and provides a kind of heating rapid, thermal efficiency height, long service life, the scope of application is extensive, adopt variable-frequency power sources, continuous stepless is regulated, and by frequency effect, become skin and galvanomagnetic-effect made oil pipe heating heating reducing thick oil viscosity de-plugging itself and high down-hole of coagulating the clear wax control of oil not have cable frequency conversion electrical heating extracting device of oil when electric current was flowed through oil pipe.

The purpose of this utility model is achieved by the following technical solution: the down-hole does not have cable frequency conversion electrical heating extracting device of oil, comprises oil pipe, sleeve pipe, the sucker rod of oil well well bore, it is characterized in that being linked with between two oil pipes (2) insulation oil pipe (11); Oil pipe (2) is provided with to be provided with between insulation centralizer (4), oil pipe (2) and sleeve (8) insulation sucker rod (10) is housed between a conductor (5), sucker rod (3), power supply line (13) one client link oil pipes (2), electric current is through conductor (5) UNICOM's sleeve pipe (8), and power line (13) other end adapter sleeve (8) constitutes current loop.

Power supply line (13) but UNICOM's power supply frequency conversion voltage adjusting control device (15); Be linked with insulation sucker rod (10) between two sucker rods (3); Be provided with metal tapered sleeve (16A) and awl wedge (16B) in the insulation centralizer (4), with the fastening location of oil pipe (2) outer wall; Conductor (5) connects with oil pipe (2), and setting upright between main body (19) and conducting block (20) in it is provided with flexible positioning piece (21), and fastening with sleeve pipe (8).

The utility model compared with prior art has following advantage:

1, oil pipe directly generates heat, and heating is generated heat evenly rapidly, the heat requirement wide ranges, and thermal efficiency height can economize on electricity 40%.

2, no cable, cost is low, and easy construction is not limited by well depth, and the scope of application is extensive.

3, heating-up temperature is easy to control, can change power source voltage and frequency according to hole condition and make it coupling, and the heat that make electromagnetism, the skin that becomes produces is optimum.

4, simple in structure, control is flexible, long service life.

Description of drawings:

Fig. 1 is the utility model structural representation;

Fig. 2 is a centralizer front view of the present utility model;

Fig. 3 is an A-A sectional view among Fig. 2;

Fig. 4 is a conductor front view of the present utility model;

Fig. 5 is a B-B amplification view among Fig. 4.

The utility model is described in further detail below in conjunction with drawings and Examples: consult shown in Figure 1, the down-hole does not have cable frequency conversion electrical heating extracting device of oil, mainly by the oil pipe 2 of oil well well bore, sucker rod 3, oil well pump 6, piston 7, sleeve pipe 8, surface pipe 12, polished rod 14, and oil pipe of the present invention insulation centralizer 4, conductor 5, power supply line 13, ground up-conversion voltage controller power source device 15 etc. constitute.This device is after conventional completion, according to viscous crude, height coagulates oily oil mining needs, at first determine the heating-up temperature scope and the heat penetration position of oil well, the pump barrel 6 of will pumping connects well down in oil well with oil pipe 2, and every oil pipe 2 is given elder generation 3-4 insulation centralizer 4 is installed, be provided with metal tapered sleeve 16A in the insulation centralizer 4, in tapered sleeve 16A, squeeze into awl wedge 16B, consult Fig. 2, shown in Figure 3, in order to the fastening location of oil pipe 2 outer walls, prevent displacement with fixed, guarantee that oil pipe 2 and oil, the cover annular space of sleeve pipe 8 have certain insulation degree.When the oil well gradient is above above 25 degree 4-5 insulation centralizer 4 can be installed on every oil pipe 2, connect oil pipe 2 successively down to required mining depth position, and according to heat penetration, conductor 5 is bound up on the oil pipe 2, join with sleeve pipe 8, between first and second root oil pipe 2 of distance well head, connect insulation oil pipe 11: piston 7 is lowered to pump barrel 6, when the sucker rod on the piston 73 times during to insulation oil pipe 11 positions, connect insulation sucker rod 10, and, make insulation sucker rod 10 between two sucker rods 3 at insulation sucker rod 10 tops connection well head sucker rod 3.Install electric submersible pump well head 1, the output of power supply tie line 13 is connected on the oil pipe 2 that has power connection 9, and electric current is through conductor 5 UNICOM's sleeve pipes 8, and the other end of power supply line 13 is bound up on the ground sleeve pipe 8 and constitutes current loop.Consult Fig. 4, shown in Figure 5 simultaneously, the upper and lower joint 24,17 at central tube 23 two ends in the conductor 5 is bound up on respectively on the upper and lower oil pipe 2, and it is spacing by upper and

lower restriction ring

22,18, set upright 20 of main body 19 and conducting blocks and be provided with compression spring 21, conducting block 20 swollen rising are pressed in the sleeve pipe 8.This conductor 5 also can adopt commercially available 251 packers, oil pipe anchor to substitute.Power supply line 13 on the oil pipe 2 through wires hole of ad hoc meter from the well head is drawn and ground up-conversion voltage controller power source device 15 UNICOMs.Polished rod 14 connects with 3 pairs of the sucker rods of going into the well, and after connecting with the oil pumper polished rod eye, opens oil pumper, and connect heating oil pipe power supply, can realize that the direct electrical heating of oil pipe recovers the oil.

Frequency conversion voltage adjusting power control in the utility model is that the power supply by certain frequency generates an electromagnetic field, and near the conductor making induces electric current, produces eddy current or circulation in conductor, and conductor itself produces ohm heat and comes heat medium.Because of Kelvin effect, flow through in surface of conductors substantially when high frequency electric source acts on conductor, corresponding resistance increases, and electric current reduces, and helps control.Need in actual applications to be regulated according to hole condition, make the influence of annulus fluid minimum, it is the highest that the efficiency of heating surface reaches.

Claims

1, a kind of down-hole does not have cable frequency conversion electrical heating extracting device of oil, comprises oil pipe, sleeve pipe, the sucker rod of oil well well bore, it is characterized in that being linked with between two oil pipes (2) insulation oil pipe (11); Oil pipe (2) is provided with to be provided with between insulation centralizer (4), oil pipe (2) and sleeve (8) insulation sucker rod (10) is housed between a conductor (5), sucker rod (3), power supply line (13) one client link oil pipes (2), electric current is through conductor (5) UNICOM's sleeve pipe (8), and power line (13) other end adapter sleeve (8) constitutes current loop.

2, electrical heating extracting device of oil according to claim 1 is characterized in that power supply line (13) but UNICOM's power supply frequency conversion voltage adjusting control device (15).

3, electrical heating extracting device of oil according to claim 1 and 2 is characterized in that being linked with between two sucker rods (3) insulation sucker rod (10).

4, electrical heating extracting device of oil according to claim 1 is provided with metal tapered sleeve (16A) and awl wedge (16B), with the fastening location of oil pipe (2) outer wall in the centralizer (4) that it is characterized in that insulating.

5, electrical heating extracting device of oil according to claim 1 is characterized in that conductor (5) and oil pipe (2) connect, and setting upright between main body (19) and conducting block (20) in it is provided with flexible positioning piece (21), and fastening with sleeve pipe (8).