CN102003168A - Leaked rock salt cavity low pressure mining technique - Google Patents

Abstract

The invention discloses a leaked rock salt cavity low pressure mining technique which belongs to the technical filed of salt well mining and comprises well overhaul process and halogen mining process in sequence, wherein the well overhaul process comprises the following steps of lifting tubes, salvaging oil tubes, clearing the well, sidetracking and downholing oil tubes in sequence; the halogen mining process adopts a water source, a water pump ship, a halogen mining pump room, a high-pressure oil well, a halogen well cavity, an oil tube, a halogen producing device, an EUE oil tube and a multiple stage centrifugal pump in sequence, wherein EUE oil tube is placed in the oil tube the lower end of the EUE oil tube is connected with one electric submersible pump. The invention can solve the problems of well cavity leakage and reduction of halogen well production during the mining process in leaked mining areas and can reduce the leakage rate in fracture growing cavities to less than 40% or lower. By the invention, underground resources in the leaked mining areas can be utilized better, the production capability of halogen wells can be restored, the production cost is reduced, and both the economic and society benefits are better.

Description

A kind of leakage Rock-salt Cavity low pressure production practice

Technical field

The present invention relates to a kind of production practice of revealing Rock-salt Cavity.

Background technology

Caused by Rock Salt Solution Mining is to the middle and later periods, and large tracts of land is communicated with between well group, and rock salt is adopted sky, and the top board large tracts of land collapses, and water-soluble felt area is to more than the top board, and bittern directly contacts with upper formation in the therefore big chamber.In existing production technology, exploitation pressure is greater than well static bottom hole pressure Pr about 30% (its pressure reduction increases with the increase of halite layer buried depth), and under the effect of this pressure reduction, bittern is pressed into the stratum in the chamber, causes the well chamber to leak.When if bittern touches geologic property and belongs to the stratum of solution cavity formula, solution crack formula or cranny development in the chamber, bigger leakage will take place, in the middle and later periods of exploitation, its wastage is more than 60% of water injection rate, make the production capacity in exploiting field descend year by year, cost of production also rises thereupon, and the situation is tense in the production in whole exploiting field; The molten chamber of the halogen well solution that has leaks in a large number, causes the pollution of groundwater resources, will form large-area pollution in case overflow ground, has great ecological hidden danger.

Summary of the invention

The objective of the invention is,, propose a kind of production practice of revealing the Rock-salt Cavity leak rate, making full use of exploiting field subterranean resource that reduces at the problems referred to above.

The technical scheme that the present invention solves the problems of the technologies described above is: a kind of leakage Rock-salt Cavity low pressure production practice, comprise big workover process successively and adopt halogen technology, wherein big workover process comprises that successively carrying pipe, salvaging oil pipe, Qing Jing, window sidetracking and oil pipe goes into the well, adopt halogen technology comprise comprise the water source successively, play pump boat, halogen-extracting pump room, high pressure injection well, the molten chamber of halogen well, oil pipe, product halogen, also be provided with an EUE oil pipe, described EUE oil pipe is lowered in the oil pipe, connects an electric submersible pump in EUE oil pipe lower end.The general pipeline group that is lowered to salt well is combined into a steel oil pipe at present, and a sleeve pipe is overlapped in the outside, and the present invention sets up an EUE oil pipe in the steel oil pipe, and this EUE oil pipe is used to hang electric submersible pump on the one hand, on the other hand as exhalant canal.

As preferably: described electric submersible pump depth of setting is the following 50～100m of hydrostatic level, does suitably to adjust according to the well feelings.

As further preferred: described electric submersible pump is the frequency conversion electric submersible pump.

Whole steps is:

(1), Data acquisition,

Project implementation mine is carried out the collection inquiry of correlation technique data, comprise exploiting field geological condition, drilling data, data such as the mining type in exploiting field, production status, pipe string structure need collect, put in order, analyze the related data of missing serious molten chamber especially in addition.By the collection of above-mentioned data, determine the character of exploiting field lost-circulation zone, and the reason of exploiting field molten chamber leakage, and the enforcement well of identifying project.

(2) mensuration of master data

1.1 the data of salt well comprise

The payzone middle part degree of depth, stratigraphic type, casing size, EUE oil pipe type and size, wellhead assembly type and size:

1.2 payzone data

Present water yield per day (m ³/ d), daily output tolerance (m ³/ d), the production pressure (MPa) of the static pressure (MPa) of well, well, gas liquid ratio (GLR), water body severe, gas severe (air is 1.0 relatively), salinity (g/l), bottom hole temperature (BHT) (℃)

1.3 well site power supply

Line voltage (KV)

1.4 ambient conditions

Surface temperature (℃), relative humidity (%)

1.5 other special circumstances

H ₂S, CO ₂, SO ₂, CL ^-, sand, rust degree, burn into fouling

1.6 the mode of production

The oil pipe draining

Well head oil pressure (MPa), surface casing pressure (MPa)

2. liquid level is determined

Well liquid synthesizes severe (r), hydrostatic level height (H), static bottom hole pressure, hydrostatic level height, PIP (MPa)

(3) unit and system dimension are selected to calculate

3.1 the vertical lift height (H of pump _d)

3.2 oil pipe friction loss (F _t)

3.3 well head oil pipe discharge pressure head (P _d)

3.4 total dynamic head (TDH)

3.5 select the pump type

Adopt former well unit, ground controller changes the variable-frequency motor controller into.Result of calculation is as follows:

Running frequency (Hz)	Discharge capacity (m 3/d)?	Lift (m)	Power (HP)	Power of motor (HP)
					50.0?	700.0?	600.0?	?	?
55.0?	770.0?	726.0?	?	?
					60.0?	840.0?	864.0?	?	?
61.0?	854.0?	893.0?	?	?
					62.0?	868.0?	922.6?	?	?
63.0?	882.0?	952.6?	?	?
					64.0?	896.0?	983.0?	?	?
65.0?	910.0?	1183.0?	?	?

3.6 the down-hole unit constitutes

The down-hole unit is respectively from bottom to up: motor, power cable plug, protector, Pump Suction Nozzle, gas separator, centrifugal multistage pump multiple centrifugal pump (being electric submersible pump), pump discharge and ball-and-seat.

3.7 the flow velocity (V) when calculating well liquid by motor housing

Casing inner diameter D, latus rectum: φ 121mm, calculating mineshaft annulus area is:

$S=\frac{\mathrm{\π}}{4}(D^2-d^2)$

$V_6=\frac{30}{3600\·s}=4.48m/s$

$V_4=\frac{25}{3600\·s}=3.73m/s$

$V_3=\frac{20}{3600\·s}=2.98m/s$

Because pit shaft is little, the outside diameter of cable is little, and well liquid fluid passes through the flow velocity of motor housing greater than ormal weight 0.305m/s, and motor is in operation and cools off, and guarantees that motor fully cools off.

3.8 calculate the voltage drop (Δ V) of power cable

3.9 check electric motor starting

3.10 electric machine controller is selected

3.11 transformer is selected

A. transformer capacity (KVA)

B. step-down transformer

C. step-up transformer

(4) the unit installation of going into the well

4.1 prepare before installing

(1) measures the alternate and insulation against ground resistance of cable with 2500V level megger, require that relatively insulaion resistance all should be greater than 500M Ω.

(2) measure cable three-phase dc resistance with universal meter, require its degree of unbalancedness should be less than 2%.

(3) with the insulation against ground resistance of universal meter measurement motor, require greater than 500M Ω.

(4) measure the three-phase dc resistance of motor with universal meter, require its degree of unbalancedness should be less than 2%.

(5) motor, protector, eliminator, gas treatment device and pump are coiled repacking and look into, axle rotates should light, flexible, no blocked portion phenomenon.

(6) be ready to elevator, chain sling, special tool, filling pump and mounted spares.

(7) the unit well that works that advances of going into the well, the drift size gauge tool external diameter must be greater than unit maximum axial projection size, and length must not be less than 10m (or motor length).

The installation 4.2 unit is gone into the well

(1) connects motor

With the special-purpose elevator motor of slinging, take the afterbody plug apart, unclamp the top protecting cover, the trapped fuel in the motor is put only.

(2) during the motor oiling, require oil injecting speed slowly and evenly, the rotating speed of manual gear pump is controlled at 8～12r/min, guaranteeing the air emptying in the motor cavity, oiling is till the no bubble of motor overhead stream oil.

(3) connect protector

With the special-purpose elevator protector of slinging, lay down protecting cover, the old round section joint ring of dismantling cleans up " O " annular groove with oil, changes " O " shape sealing ring of junction.Lay down motor head protecting cover, slowly steadily transfer protector, the spline on the protector axle is linked to each other with internal spline on the motor shaft, and tighten attachment screw.

(4) stube cable head

Take the cable head protecting cover apart, cable plug is cleaned up, do not allow any foul with dynamo oil, change " O " shape sealing ring at cable head place, simultaneously motor socket place protecting cover is opened, cleaned up, cable head is linked to each other with the motor socket and be fastenedly connected screw with oil.

(5) D.C. resistance and the insulaion resistance after measuring cable and motor is connected with mechanical universal meter, the degree of unbalancedness of D.C. resistance should be less than 2%, insulation against ground resistance, requirement is greater than 500M Ω.

(6) check phase sequence, carry out the phase sequence mark.

(7) protector oiling

Whole air vents on the protector are opened, from the oiling of motor head fuel feeding valve.Oil injecting speed requires slowly evenly, and the rotating speed of manual gear pump is controlled at 8～12r/min, to guarantee the air emptying in the protector chamber, when the oil that flows out in the air vent does not have bubble, by fuel-displaced order air vent is tightened one by one with plug.

(8) connect eliminator

With the special-purpose elevator eliminator of slinging, dismantle protecting cover, slowly steadily transfer, the external splines on the decoupler shaft is linked to each other with internal spline on the protector axle, and tighten attachment screw.

(9) connect the gas treatment device

With the special-purpose elevator gas treatment device of slinging, dismantle protecting cover, clean and change " O " shape sealing ring, slowly steadily transfer, the external splines on the gas treatment device axle is linked to each other with internal spline on the decoupler shaft, and tighten attachment screw.

(10) connect pump

With the special-purpose elevator pump of slinging, lay down the bottom protecting cover, clean and change " O " shape sealing ring, slowly steadily transfer then, the external splines on the pump shaft is linked to each other with internal spline on the gas treatment device axle, and tighten attachment screw.

4.3 D.C. resistance and insulaion resistance that unit is gone into the well and measured unit midway

Unit is gone into the well in the process, should whenever be lowered to 200m (10 post oil pipe) when dark, measures the D.C. resistance and the insulaion resistance of a unit.

4.4 connect ball-and-seat and beat strain relief clamp

Ball-and-seat is connected on pump discharge the 3rd post oil pipe top, then follows oil pipe down, and the oil pipe lowering velocity must not be greater than 0.7m/s.Each makes a call to a strain relief clamp at the every upper and lower about 0.5m of tubing coupling place respectively.

4.5 go into the well

To unit the degree of depth being set down is 100～1800m, i.e. down-hole unit nominal working range.Concrete depth of setting needs according to the down-hole situation---and decide the hydrostatic level position.

4.6 installation well head

4.7 cable passes through well head

(1) partly peelling off the armour skin by dimensional requirement removes braid power cable to be passed through well head, exposes lead sheath, and size is approximately flange bottom 500mm, flange 70mm, flange top 500mm.

(2) with sand paper that the lead sheath polishing is clean, remove deburring, and clean with cleaning agent (acetone).

(3) cable is passed closed hole, load onto backing plate, seal, gland, and tighten the screws.

4.8 well head pressure testing

After electric pump well device and cable seal, gate valve, pressure meter etc. all install, inject natural gas, check with suds whether the well head each several part leaks gas till pressure is raised to the highest well head pressure of this well to the oil pipe annular space.

4.9 wiring, operation

(1) wiring: transformer, controller and junction box and power connection.

(2) check before the operation.

A. the operational factor of adjustment control is provided with overload factor and underload coefficient, and overload factor is 1.2, and underload coefficient is 0.75;

B. check whether the whole actuating mechanisms of controller are sensitive;

C. check whether whole circuit connect correct, firm;

D. check supply voltage, voltage pulsation is no more than 10%;

E. check power phase;

F. the D.C. resistance of unit and insulaion resistance under the measuring well;

G. check the surface line flow process.

(3) operation operation

Beneficial effect of the present invention is: the present invention can solve the well chamber leakage that takes place in the recovery process of exploiting field, the problem that the halogen well capacity descends of leaking, the leak rate in the molten chamber of cranny development is reduced to below 40%, even it is lower, the present invention can make the subterranean resource that leaks the exploiting field obtain better utilization, the halogen well capacity is recovered, cost of production reduces, and economic benefit and social benefit are all good.

Description of drawings

Fig. 1 is the equipment signal and the workflow diagram of the embodiment of the invention 1.

1 is motor, and 2 is protector, and 3 is Pump Suction Nozzle, and 4 are following joint centrifugal multistage pump multiple centrifugal pump; 5 is last joint centrifugal multistage pump multiple centrifugal pump, and 6 is pump discharge, and 71 is the well dynamic cable; 72 is the ground power cable, and 8 is sleeve pipe, and 9 is the EUE oil pipe; 10 is wellhead assembly, and 11 is junction box, and 12 is step-up transformer; 13 is controller, and 14 is step-down transformer, and 15 is power supply; A is a hydrostatic level, and B is a producing fluid level, and C is a payzone.

The specific embodiment

The present invention is described in further detail below in conjunction with the specific embodiment.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.

Present embodiment is an example with No. 302 wells in Chang Mount town, Zigong City Rong County, Sichuan

1.1 the data of well

Pound sign: 302 wells

Well location: Chang Mount town, Zigong City Rong County, Sichuan

The payzone middle part degree of depth (m): 1020.0

Stratigraphic type: limestone

Casing size (mm): internal diameter: φ 124, latus rectum: φ 121

Oil pipe type and size: API 2 ⁷/ ₈"

1.2 payzone data

Present water yield per day (m ³/ d): 0

Daily output tolerance (m ³/ d): 0

The static pressure of well (MPa): 0

The production pressure (MPa) of well: 0.35

Water body severe: 1.21

Gas severe (air is 1.0 relatively): 0.56

Salinity (g/l): 300

Bottom hole temperature (BHT) (℃): 40.0

1.3 well site power supply

Line voltage (KV): 10, (50Hz)

1.4 ambient conditions

Surface temperature (℃): 40

Relative humidity (%): below 80

1.6 other special circumstances

H ₂S (≤50mg/L), CO ₂(), SO ₂(), CL ^-(√), sand (√), rust degree (), corrosion (√), fouling (√)

1.6 the mode of production

The oil pipe draining

Well head oil pressure (MPa): P _t=0.35

Surface casing pressure (MPa): P _c=0.90

1.7 customer requirements

A. the initial stage lifting rate (m of pump ³/ d): 720

B. pump normally moves lifting rate (m ³/ d): 650～850 (27～35m ³/ h)

C. pump is provided with the degree of depth (m): 600

D. well head discharge opeing pressure (MPa): 0.35

E. well head casing pressure (MPa): 0.90

F. the minimum submergence setting (m) of pump: 200

Liquid level is determined

2.1 well liquid synthesizes severe (r)

Because of this well does not have oil, so the synthetic severe r=water severe r of well liquid _w=1.4

2.2 the height of hydrostatic level A (H)

Static bottom hole pressure P _r=9.3MPa (estimating that hydrostatic level is from well head 300m)

Hydrostatic level height: H=1020-300=720m

2.3 3 pressure (MPa) of Pump Suction Nozzle:

3.0 unit and system dimension are selected to calculate

3.1 the vertical lift height (H of pump _d)

H _d＝600-200＝400m

3.2 oil pipe friction loss (F _t)

$F_t=\frac{1.2}{100}\×600=7.2\≈8m$

3.3 well head oil pipe discharge pressure head (P _d)

Pd＝0.5×10.189855×10.01/1.21＝42.0m

3.4 total dynamic head (TDH)

TDH＝600+8+42＝650m

3.5 select the pump type

Adopt former well unit, ground controller is the variable-frequency motor controller.Result of calculation is as follows:

Running frequency (Hz)	Discharge capacity (m 3/d)?	Lift (m)	Power (HP)	Power of motor (HP)
					50.0?	700.0?	600.0?	?	?
55.0?	770.0?	726.0?	?	?
					60.0?	840.0?	864.0?	?	?
61.0?	854.0?	893.0?	?	?

62.0?	868.0?	922.6?	?	?
					63.0?	882.0?	952.6?	?	?
64.0?	896.0?	983.0?	?	?
					65.0?	910.0?	1183.0?	?	?

3.6 the down-hole unit constitutes

A. centrifugal multistage pump multiple centrifugal pump comprises joint centrifugal multistage pump multiple centrifugal pump 4 and last joint centrifugal multistage pump multiple centrifugal pump 5 down:

Model: QYB98-700/600,140 grades, discharge capacity 700m ³/ d, 50Hz single-stage lift 4.3m/

Level, length: 5640+5640+2240=13520mm

B. gas separator is selected QYF98-Z

C. protector is selected QYH98T-N doubly-linked capsule-type

D. selection of Motor YQY114T-85KW (100HP), during 50Hz, voltage V/ electric current A=1785V/43A

E. the power cable plug selects the QYT-5T-G plug-in type to connect

3.7 the flow velocity (V) when calculating well liquid by motor housing

Sleeve pipe 8 internal diameters: φ 124mm, latus rectum: φ 121mm, calculating mineshaft annulus area is:

$S=\frac{\mathrm{\π}}{4}(D^2-d^2)=\frac{\mathrm{\π}}{4}({0.124}^2-{0.114}^2)={0.00186m}^2$

$V_6=\frac{30}{3600\·s}=4.48m/s$

$V_4=\frac{25}{3600\·s}=3.73m/s$

$V_3=\frac{20}{3600\·s}=2.98m/s$

Because pit shaft is little, the outside diameter of cable is little, and well liquid fluid passes through the flow velocity of motor housing greater than ormal weight 0.305m/s, and motor is in operation and cools off, and guarantees that motor fully cools off.

3.8 calculate the voltage drop (Δ V) of power cable

Motor nameplate voltage V/ electric current A:1585V/43A

Check in cable voltage drop by figure: 19V/305m

The actual cable voltage drop:

3.9 check electric motor starting

Calculate electric motor starting voltage drop: V _Open=* 4.0=197.6V

Motor terminals starting resistor: V _Machine=1785-197.6=1587.4V

The percentage of electric motor starting voltage and motor nameplate voltage: 1587.4 ÷, 1785 * 100%=88.93%

Result of calculation, electric motor starting voltage is greater than 50% of motor nameplate voltage (1785V), and motor can normally start.

3.10 electric machine controller is selected

A. calculate ground " zero load " voltage

Motor nameplate voltage (during 50Hz)=1785V

Highest frequency (65Hz) working voltage=2048V

Cable voltage drop=197.6V

Ground full load voltage=2185V

Transformer step-down coefficient=1.03

Ground " zero load " voltage=2250V

B. Electric Machine Control capacity (KVA)

$\frac{V\×I\×1.73}{1000}=\frac{2250\×43\×1.732}{1000}=168\mathrm{KVA}$

C. select the frequency-variable controller model

2200-3VT input 480V, 245A output 200KVA, 241A, size: 182.9 * 71.1 * 95.3cm, weight: 476kg

3.11 transformer is selected

A. transformer capacity (KVA)

$\frac{2250\×43\×1.732}{1000}=168\mathrm{KVA}$

The selection capacity is that 200KVA and controller are complementary

B. step-down transformer 14

Capacity (KVA): 200

Elementary transformation (KV): 10 (50Hz)

Regulation stall (5 grades): 9500,9750,10000,10250,10500

Two grades of secondary voltage (V): 480V, 38V

The type of cooling: integral sealing, oil immersed type

C. step-up transformer 12

Capacity (KVA): 200

Primary voltage (V): 480 or 380 (50Hz)

Secondary voltage (V): 1500～2500

Regulation stall (28 grades)

4. the unit installation of going into the well

4.1 prepare before installing

(1) measure the alternate and insulation against ground resistance of cable with 2500V level megger, requiring relatively, insulaion resistance is 510M Ω.

(2) measure cable three-phase dc resistance with universal meter, its degree of unbalancedness is 1.5%.

(3) with the insulation against ground resistance of universal meter measurement motor, be 510M Ω.

(4) with the three-phase dc resistance of universal meter measurement motor, its degree of unbalancedness is 1.5%.

(5) motor 1, protector 2, eliminator, gas treatment device and pump are coiled repacking and look into, axle rotates should light, flexible, no blocked portion phenomenon.

(6) be ready to elevator, chain sling, special tool, filling pump and mounted spares.

(7) the unit well that works that advances of going into the well, the drift size gauge tool external diameter is greater than unit maximum axial projection size, and length is 12m (or motor length).

The installation 4.2 unit is gone into the well, as shown in Figure 1

(1) connects motor 1

With the special-purpose elevator motor of slinging, take the afterbody plug apart, unclamp the top protecting cover, the trapped fuel in the motor is put only.

(2) during the motor oiling, require oil injecting speed slowly and evenly, the rotating speed of manual gear pump is controlled at 10r/min, guaranteeing the air emptying in the motor cavity, oiling is till the no bubble of motor overhead stream oil.

(3) connect protector

With the special-purpose elevator protector of slinging, lay down protecting cover, the old round section joint ring of dismantling cleans up " O " annular groove with oil, changes " O " shape sealing ring of junction.Lay down motor head protecting cover, slowly steadily transfer protector, the spline on the protector axle is linked to each other with internal spline on the motor shaft, and tighten attachment screw.

(4) stube cable head

Take the cable head protecting cover apart, cable plug is cleaned up, do not allow any foul with dynamo oil, change " O " shape sealing ring at cable head place, simultaneously motor socket place protecting cover is opened, cleaned up, cable head is linked to each other with the motor socket and be fastenedly connected screw with oil.

(5) measure cable with mechanical universal meter and D.C. resistance and insulaion resistance after motor is connected, the degree of unbalancedness of D.C. resistance is 1.5%, and insulation against ground resistance is 510M Ω.

(6) check phase sequence, carry out the phase sequence mark.

(7) protector oiling

Whole air vents on the protector are opened, from the oiling of motor head fuel feeding valve.Oil injecting speed requires slowly evenly, and the rotating speed of manual gear pump is controlled at 10r/min, to guarantee the air emptying in the protector chamber, when the oil that flows out in the air vent does not have bubble, by fuel-displaced order air vent is tightened one by one with plug.

(8) connect eliminator

With the special-purpose elevator eliminator of slinging, dismantle protecting cover, slowly steadily transfer, the external splines on the decoupler shaft is linked to each other with internal spline on the protector axle, and tighten attachment screw.

(9) connect the gas treatment device

With the special-purpose elevator gas treatment device of slinging, dismantle protecting cover, clean and change " O " shape sealing ring, slowly steadily transfer, the external splines on the gas treatment device axle is linked to each other with internal spline on the decoupler shaft, and tighten attachment screw.

(10) connect pump

With the special-purpose elevator pump of slinging, lay down the bottom protecting cover, clean and change " O " shape sealing ring, slowly steadily transfer then, the external splines on the pump shaft is linked to each other with internal spline on the gas treatment device axle, and tighten attachment screw.

4.3 D.C. resistance and insulaion resistance that unit is gone into the well and measured unit midway

Unit is gone into the well in the process, should whenever be lowered to 200m (10 post oil pipe) when dark, measures the D.C. resistance and the insulaion resistance of a unit.

4.4 connect ball-and-seat and beat strain relief clamp

Ball-and-seat is connected on pump discharge the 3rd post oil pipe top, then follows oil pipe down, and the oil pipe lowering velocity is 0.6m/s.Each makes a call to a strain relief clamp at the every upper and lower about 0.5m of tubing coupling place respectively.

4.5 go into the well

In unit is gone into the well overall process, cable is remained point-blank, be strictly on guard against outside unit He outside the tubing string and coil, or beat phenomenons such as turning round upset.Simultaneously, in the overall process of going into the well, be strictly on guard against the cable that stretches energetically.To prevent that also cable multilayer on cylinder from getting loose simultaneously and pile up on the ground, beat and phenomenon such as turn round, with antisitic defect cable and insulation.To unit the degree of depth being set down is 400m, and the aforementioned hydrostatic level height of present embodiment is 720m, and promptly the hydrostatic level degree of depth is 300m, so selection is 400m to the unit degree of depth down.

4.6 installation well head

After all oil pipes descend projected depth, the D.C. resistance and the insulaion resistance of measurement unit, meet standard after, electric pump special use wellhead assembly can be installed, and carry out construction note.

4.7 cable passes through well head

(1) partly peelling off the armour skin by dimensional requirement removes braid power cable to be passed through well head, exposes lead sheath, and size is approximately flange bottom 500mm, flange 70mm, flange top 500mm.

(2) with sand paper that the lead sheath polishing is clean, remove deburring, and clean with cleaning agent (acetone).

(3) cable is passed closed hole, load onto backing plate, seal, gland, and tighten the screws.

4.8 well head pressure testing

After electric pump well device and cable seal, gate valve, pressure meter etc. all install, inject natural gas, check with suds whether the well head each several part leaks gas till pressure is raised to the highest well head pressure of this well to the oil pipe annular space.

4.9 wiring, operation

(1) wiring: transformer, controller and junction box and power connection.

(2) check before the operation.

A. the operational factor of adjustment control is provided with overload factor and underload coefficient, and overload factor is 1.2, and underload coefficient is 0.75;

B. check whether the whole actuating mechanisms of controller are sensitive;

C. check whether whole circuit connect correct, firm;

D. check supply voltage, voltage pulsation is 8%;

E. check power phase;

F. the D.C. resistance of unit and insulaion resistance under the measuring well;

G. check the surface line flow process.

(3) operation operation.

Adopt the method for present embodiment, make the leak rate in the molten chamber of cranny development reduce to 35%, make the subterranean resource that leaks the exploiting field obtain better utilization.

Claims (3)

1. reveal Rock-salt Cavity low pressure production practice for one kind, comprise big workover process successively and adopt halogen technology, wherein big workover process comprises that successively carrying pipe, salvaging oil pipe, Qing Jing, window sidetracking and oil pipe goes into the well, adopt halogen technology comprise comprise the water source successively, play pump boat, halogen-extracting pump room, high pressure injection well, the molten chamber of halogen well, oil pipe, product halogen, it is characterized in that: also be provided with an EUE oil pipe, described EUE oil pipe is lowered in the oil pipe, connects an electric submersible pump in EUE oil pipe lower end.

2. a kind of leakage Rock-salt Cavity low pressure production practice according to claim 1 is characterized in that: described electric submersible pump depth of setting is the following 50～100m of hydrostatic level.

3. according to the described a kind of leakage Rock-salt Cavity low pressure production practice of claim 2, it is characterized in that: described electric submersible pump is the frequency conversion electric submersible pump.