CN102337879A - Salt mine drilling solution mining device and method - Google Patents
Salt mine drilling solution mining device and method Download PDFInfo
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- CN102337879A CN102337879A CN2011102686182A CN201110268618A CN102337879A CN 102337879 A CN102337879 A CN 102337879A CN 2011102686182 A CN2011102686182 A CN 2011102686182A CN 201110268618 A CN201110268618 A CN 201110268618A CN 102337879 A CN102337879 A CN 102337879A
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Abstract
The invention discloses a salt mine drilling solution mining device and a salt mine drilling solution mining method matched with the device. The device comprises a central tube and a sleeve, wherein the central tube is sleeved in the sleeve, the upper end of the central tube is arranged to be flush with the upper end of the sleeve, the lower end of the central tube is longer than the lower end of the sleeve, the part of the central tube exceeding the lower end of the sleeve is provided with a plurality of perforated pores, and a brine channel is arranged in the central tube. By adopting the method, the purpose of diluting oversaturated brine can be achieved with no need for increase in the injection amount of freshwater. When the device and the method are adopted, the concentration of the produced brine is in the appropriate brine under-saturation concentration range, the product cost cannot be increased result from over low concentration of the brine, and the crystallization or clogging phenomenon cannot be caused result from over high concentration of the brine. Moreover, energy can be saved, the production cost can be reduced, and good economic benefits and social benefits can be achieved.
Description
Technical field
The present invention relates to a kind of underground salt mine quarrying apparatus and method, particularly a kind of salt mine drilling solution mining device and method.
Background technology
Salt mine drilling solution mining technology is at the sensible rock salt ore body of ground drilling, and central tube is placed in the sleeve pipe down to the rock salt ore body, and water filling dissolving rock salt forms Rock-salt Cavity, and the bittern in the Rock-salt Cavity returns to ground.When using the drilling solution mining technology, in order to reduce production costs, to fail halogen cost and salt manufacturing cost as far as possible, it is saturated good more that the bittern concentration of exploitation is tending towards more, and therefore in normal exploitation, the depth of setting of central tube and sleeve pipe should be tried one's best deeply.Special after the halogen well is repaired and renovate, the following pipe degree of depth that production division confirms is all darker.But in salt well, downhole temperature is that the increase with well depth raises, and this phenomenon is called geothermal gradient, and the scope of its geothermal gradient is: 0.02 ~ 0.03 ℃/m.Referring to multiple salt shown in Figure 1 solubility curve figure in water, the solubility that can see most of salts all is that the increase with temperature increases, and reduces with the reduction of temperature.Therefore when producing, bittern rises to ground from Rock-salt Cavity, receives the influence of geothermal gradient, and saturated or be tending towards saturated brine temperature and reduce gradually in the down-hole, solubility also descends thereupon, supersaturation will occur, causes that the salt solute is separated out, crystallization.When not having enough power that crystal is gone out ground in the pipe, the saline crystallization solute of separating out will be attached to inner-walls of duct, finally causes salt crystallization blocking pipe.Particularly some goes out the halogen well of halogen excessive concentration, in the production salt crystallization plugging serious, both had influence on and produced the halogen ability, halogen well safety in serious threat again.
In order to prevent bittern crystallization blocking pipe; There is the inventor to invent a kind of salt mine well water is dissolved recovery method (application publication number: CN102108853A; The applying date: on January 14th, 2011); It discloses a kind of underground salt mine well water has been dissolved recovery method; As shown in Figure 7; It is to open perforation 3 in straight well 10 down-hole central tubes 2 bottom position both sides; In the well production process; When horizontal well 11 injects fresh water; Shunt a part of fresh water and inject straight well central tube 2; Fresh water is flowed in the sleeve pipe 1 by straight well central tube perforation 3 places; Supersaturation bittern in the dilution straight well sleeve pipe 1; By the injection flow of electromagnetic flowmeter display monitoring straight well central tube, that accurately controls the straight well sleeve pipe goes out halogen concentration.But this method is disclosed is the bittern exploitation method that is applied to a plurality of connection halogen wells; In the halogen well of a plurality of connections; One of them halogen well is used to inject fresh water and dissolves rock salt formation bittern; The central tube of another halogen well and the annular space of sleeve pipe go out bittern; The bittern passage is the annular space of central tube and sleeve pipe, and it openly is not applied to the bittern exploitation method of single halogen well.It is in a part of fresh water injection straight well central tube by the shunting horizontal well that disclosed in addition salt mine dissolves recovery method to well water; The perforation of fresh water by the central tube lower end gets in the annular space of straight well central tube and sleeve pipe and dilutes supersaturation bittern wherein; This method is controlled straight well by electromagnetic flowmeter display monitoring straight well central tube injection flow and is gone out halogen concentration; But because salt deposit has the very dark degree of depth apart from the face of land; Central tube and sleeve pipe all need be deep in the Rock-salt Cavity just can adopt halogen; It is poor to show that by electromagnetic flowmeter the injection rate of controlling fresh water has a regular hour; Cause out the halogen concentration can be too unstable; And this method is not openly diluted bittern to much concentration yet and is advisable; The bittern concentration of extracting out is low excessively; In production cost control is uneconomical to one's profit; And this method is diluted bittern by shunting fresh water; Can increase the use amount of fresh water and pump; Increase the energy consumption of whole system, increase production cost.
Summary of the invention
The object of the invention just is the deficiency to prior art; A kind of salt mine drilling solution mining device is provided; And salt mine drill well water mixeding mining method with this matched with devices use; The injection rate that this method need not increase fresh water just can reach the purpose of diluting supersaturation bittern; Utilize bittern concentration that apparatus of the present invention and method produce in suitable bittern sub-saturated concentration range; Bittern concentration neither can be because of crossing the low production cost that increases; Can be because of too high generation crystallization clogging yet; And energy savings of the present invention; Reduce production costs, economic benefit and social benefit are all good.
To achieve these goals; The present invention has adopted a kind of like this salt mine drilling solution mining device; It comprises central tube and sleeve pipe; Central tube is placed in the sleeve pipe; Central tube upper end and sleeve pipe upper end level; The sleeve pipe lower end is longer than in the central tube lower end, and the central tube that exceeds the sleeve pipe lower end is provided with several perforations, is the bittern passage in the central tube.When this device was used for single halogen well convection current and produces, the annular space of said central tube and sleeve pipe was the fresh water passage, and fresh water dilutes rock salt through this passage; When the halogen well that is used for a plurality of connections when this device was adopted halogen and produced, the annular space of said central tube and sleeve pipe was that the well cavity pressure is observed passage, and the pipeline of fresh water through other halogen well injects and dissolve rock salt.
As further improvement of the present invention, also be connected with screen casing in described central tube lower end, have several sieve apertures on the screen casing, can increase the water inlet area of central tube like this, prevent that the down-hole deposit from stopping up water inlet fully.
Referring to bittern concentration distribution schematic diagram in the Rock-salt Cavity shown in Figure 2, can find that the bittern in the Rock-salt Cavity has significantly " layering " phenomenon.Promptly on same horizontal plane, the difference of bittern concentration is very little, and bittern concentration only changes in vertical direction, the base plate the closer to molten chamber, and concentration value is big more, and concentration reaches capacity.Central idea of the present invention is exactly the lamination according to bittern in the Rock-salt Cavity; Being bittern concentration becomes big with the intensification of the degree of depth; Use to open on the central tube of perforating system in stretching into Rock-salt Cavity and penetrate several perforations; Because it is far away that perforation position distance is dissolved the chamber base plate; Bittern concentration is also lower; Therefore advance the saturated bittern of halogen or screen casing entering and the light bittern mixing that gets into from the central tube perforation from central tube; Formed sub-saturated bittern; This sub-saturated bittern is produced ground through central tube again, has prevented saturated bittern is directly extracted crystallization obstruction central tube out from central tube phenomenon.
Stratification according to above-mentioned Rock-salt Cavity; The technical scheme of the inventive method is such: a kind of salt mine drill well water mixeding mining method; Comprise drilling well, down manage, dissolve rock salt, produce halogen; It is characterized in that: described dissolve rock salt and produce halogen further comprising the steps of between the stage: (1) in Rock-salt Cavity, that measures central tube goes out halogen concentration with central tube; (2), get into and produce the halogen stage if the halogen concentration of measuring that goes out is in the bittern sub-saturated concentration range; If going out halogen concentration is higher than the sub-saturated upper limit of concentration, get into next step perforation program; (3) measure the bittern concentration of central tube perforation position and the bittern concentration that central tube enters the halogen place; The value of determining halogen concentration is in the bittern sub-saturated concentration range; According to the bittern concentration at two places that record with go out the percentage that halogen concentration calculates the bittern flow that bittern flow that the sieve aperture domestic demand gets into and perforation place need get into; Confirm the quantity and the size of perforation according to this percentage; Use perforating system on the perforation position of central tube, to open and penetrate some and a certain size perforation, measure halogen concentration; (4) still high if go out halogen concentration, perforation is in the bittern sub-saturated concentration range until going out halogen concentration repeatedly.
Wherein said bittern sub-saturated concentration range is 295g/L～305g/L, and the distance of the perforation position of said central tube and the top sieve aperture of screen casing is at a distance of 5-20m.
Compared with prior art; The invention has the advantages that: the present invention need not increase fresh water and inject and dilute supersaturation bittern; It utilizes the lamination of bittern in Rock-salt Cavity; With light bittern mixing supersaturation bittern; By calculating; Open the perforation of penetrating some and size in the appropriate location of central tube lower end; Light bittern just can get into by perforation and mix supersaturation bittern formation sub-saturated bittern in the central tube; Salt well goes out halogen concentration and just can accurately be controlled like this; And also reduced the use amount of fresh water; Reduce the energy consumption of whole system, saved production cost.
For with the supporting use of the inventive method, apparatus of the present invention are also improved.Central tube equates with the length of sleeve pipe in the prior art; Their both ends horizontal; Central tube and sleeve pipe all stretch in the Rock-salt Cavity; Because central tube is placed in the sleeve pipe; Bittern in the Rock-salt Cavity can't be through the perforation on the central tube; And the lower end that apparatus of the present invention are longer than sleeve pipe with the lower end design of central tube; Growing that part of central tube in sleeve pipe lower end just stretches in the Rock-salt Cavity; And sleeve pipe only arrives the salt deposit top board, and the bittern in the Rock-salt Cavity just can enter into central tube through the perforation on the central tube like this.
The present invention had both avoided the too high crystallization blocking pipe of bittern concentration; Also avoided bittern concentration to cross the low cost of production that increases; Use technical scheme of the present invention; Halogen well safety, efficient, quantity-produced ability have been improved; Reduced the operating cost of a lower tubular column; Practiced thrift the energy, reduced cost of production, economic benefit and social benefit are all good.The inventive method not only can be applied to single halogen well simultaneously, also can be applied to the halogen well of a plurality of connections, because the Rock-salt Cavity of each halogen well is communicated with in the halogen well of a plurality of connections, bittern can flow freely, and each halogen well can shared bittern.
Description of drawings
Fig. 1 is the solubility curve figure of multiple salt in water;
Fig. 2 is the distribution schematic diagram of bittern concentration in the 139 well Rock-salt Cavity;
Fig. 3 is the solubility curve figure of NaCl in water;
Fig. 4 is a perforating system perforation sketch map;
Fig. 5 is apparatus of the present invention structural representation;
Fig. 6 falls salty sketch map for principle of the invention water distribution;
Fig. 7 is the method sketch map of referenced patents in the background technology.
Marginal data:
1, sleeve pipe; 2, central tube; 3, perforation; 4, initiator; 5, perforating gun; 6, perforating bullet; 7, box cupling; 8, sieve aperture; 9, screen casing; 10, straight well; 11, horizontal well; 12, Rock-salt Cavity; 13, salt deposit top; 14, dissolve the chamber base plate.
The specific embodiment
In order to be expressly understood the object of the invention, technical scheme and beneficial effect more, below in conjunction with accompanying drawing the present invention is done further explanation, but protection scope of the present invention is not limited in following examples.
Referring to Fig. 5; A kind of salt mine drilling solution mining device; Comprise central tube 2, sleeve pipe 1 and screen casing 9; Central tube 2 is placed in the sleeve pipe 1, the upper end level of central tube 2 upper ends and sleeve pipe 1, and central tube 2 lower ends are longer than the lower end of sleeve pipe 1 and are connected with screen casing 9; Have several sieve apertures 8 on the screen casing 9; Be provided with screen pack in the screen casing 9, the central tube 2 that exceeds sleeve pipe 1 lower end is provided with several perforations 3, is the bittern passage in the central tube 2.A kind of salt mine drilling solution mining of the present invention device can be applied to single halogen well convection current and produce, and the halogen well that also can be applied to a plurality of connections is adopted halogen production.When being applied to single halogen well convection current and producing, central tube 2 is the fresh water passage with the annular space of sleeve pipe 1; When the halogen well that is applied to a plurality of connections was adopted halogen production, central tube 2 was that the well cavity pressure is observed passage with the annular space of sleeve pipe 1.Use a kind of salt mine drill well water mixeding mining method of drilling solution mining device of the present invention; Comprise drilling well, down manage, dissolve rock salt, produce halogen; Referring to Fig. 5; The exploitation personnel are from the sensible rock salt ore body of ground drilling; With pipeline down to salt deposit top 13; Inject fresh water dissolution rock salt and form Rock-salt Cavity 12, then with central tube 2 in Rock-salt Cavity 12, begin to produce halogen.When the inventive method was applied to single halogen well convection current and produces, fresh water injected dissolving rock salt from the annular space of central tube 2 and sleeve pipe 1; When the halogen well that is applied to a plurality of connections was adopted halogen production, apparatus of the present invention central tube 2 was that the well cavity pressure is observed passage with the annular space of sleeve pipe 1, and fresh water injects dissolving rock salt from the pipeline of other halogen well.When producing halogen, bittern turns back to ground through central tube 2, and that measures bittern goes out halogen concentration.When going out halogen concentration in bittern sub-saturated concentration 295～305g/L scope the time, can change the production phase over to, bittern returns to ground through central tube 2; When going out halogen concentration and be higher than the upper limit 305g/L of bittern sub-saturated concentration, change the perforation stage over to.Use the survey concentration device to measure central tube and advance the bittern concentration at halogen place and the bittern concentration at central tube perforation place; According to the concentration value at this two place with go out the bittern flow percentage that the halogen densimeter is calculated sieve aperture and perforation; The value that wherein goes out halogen concentration should be in bittern sub-saturated concentration range; Confirm the quantity and the size of perforation then according to this percentage, use perforating system on the perforation position of central tube, to open and penetrate some and a certain size perforation.Referring to Fig. 4; Perforating gun 5 connects the perforation position that initiator 4 is put into central tube 2 to central tube; Start initiator 4; Perforating bullet 6 is penetrated from perforating gun 5 and is worn central tube 2 formation perforations 3; The saturated bittern that gets into from screen casing 9 mixes with the light bittern that gets into from perforation 3, forms sub-saturated bittern and returns ground through central tube 2.Salty stability is fallen in order to improve perforation; Also can consider repeatedly perforation; After promptly carrying out the perforation first time; Bittern concentration does not have too big variation; Can carry out the perforation second time at same position; If still not too big variation rule of thumb can improve 1-2m with the perforation position and carry out perforation again, up to the concentration value that reaches setting.As further improvement of the present invention, central tube 2 bottoms in down-hole connect screen casing 9 through box cupling 7, and bittern flows in the central tube 2 through a plurality of sieve apertures 8, can increase the water inlet area of central tube like this, prevents that the down-hole deposit from stopping up water inlet fully.
Be the example explanation with rock salt body stone tablet ditch exploiting field, prestige west 139 wells below.
Rock salt body stone tablet ditch exploiting field, prestige west 139 well production times are in June, 1993, adopt lubricating pad to build the groove mode in July, 1994 and 140 well connection exploitations.After the last overhaul in 2010, it is still darker that central tube is lowered to salt deposit, causes out halogen concentration up to 317～319g/L, in the production salt crystallization plugging serious, both had influence on and produced the halogen ability, halogen well safety in serious threat again.139 wells flow in process of production descend gradually, and three day time is promptly from 52m
3/ h reduces to 23m
3/ h.Need carry out in per three days once towards well, and need stop production about 10h towards well at every turn,, cause the downhole production accident and stop production if be late for towards well promptly causing down-hole salt crystallization plugging.Therefore this well central tube is implemented perforation, reach water distribution and fall salty purpose, will go out halogen concentration and reduce.
1, exploiting field well ore deposit data
1.1 well depth: 1041.63m
1.2 salt deposit top board: 1027.15m
1.3 salt deposit base plate: 1043.15m
1.4 salt layer thickness: 16m
1.5 sleeve pipe: Φ 177.8 * 1035.33m
1.6 dark 1038.927m under the central tube
1.7 go out halogen concentration: 317～319g/L
1.8 the long 1.5m of screen casing, Φ 35mm * 12 holes, spiral is uniformly distributed with, and last sieve aperture advances salt deposit 9.877m, and top sieve pitch-row box cupling 6.5m should avoid box cupling during perforation, and the perforation position is generally at the above 0-2.5m of box cupling.
2, exploiting field salt crystallization situation analysis
In this well was produced, owing to be subjected to the influence of geothermal gradient, downhole temperature raise with the increase of well depth, referring to Fig. 1, can know that high more its bittern concentration of downhole temperature is just big more.Getting geothermal gradient is 0.03 ℃/m, and surface temperature is 25 ℃, and then the molten cavity temperature of this well is:
T＝25＋1000×0.03＝55℃
It is 38 ℃ that this well produces the halogen temperature, and promptly the temperature difference on this well bittern output ground from the down-hole is:
ΔT＝55－38＝17℃
During production, saturated or when being tending towards saturated salting liquid and being retracted to ground by central tube, because temperature reduces gradually, solubility also descends thereupon in the down-hole, will occur that supersaturation or salt solute are separated out, the phenomenon of crystallization.By NaCL shown in Figure 3 solubility curve figure in water, in the time of can obtaining 55 ℃, the saturated content of NaCL in water is 331.94g/L; In the time of 38 ℃, the saturated content of NaCL in water is 316.38g/L.Using the interior brine temperature of logging truck actual measurement 1000m place's central tube is 54 ℃, and content is 329.4g/L.The NaCL crystal of in central tube, separating out when this well is produced is 13.02 g/L.
This well yield is 50m
3About/h, promptly per hour in central tube, separate out the NaCL crystal and reach 651kg, rock salt proportion 2.17 * 10
3Kg/m
3, promptly per hour in central tube, separate out NaCL crystal volume and be:
V＝651÷（2.17×10
3?）＝0.3?m
3
Because the center velocity in pipes do not have enough power that crystal is gone out ground, separate out, the NaCL of crystallization will be attached to the central tube inwall, finally causes the salt crystallization to stop up central tube.Therefore the halogen concentration that suits out of bittern should be within 295～305g/L, and such bittern concentration concentration that both do not reached capacity can not crossed the low cost of production that increases yet.
3, formulate the gun perforation process flow process
3.1 well logging
With logging truck or perforator truck, measuring the interior brine temperature of 1000m place oil pipe is 54 ℃, and concentration is 329.4g/L; Wellhead temperature is 38 ℃, and bittern concentration is 316.38g/L; Going out the halogen amount is 40m
3/ h.
3.2 working design
1. base area stressor layer, lithology, down-hole situation, permeability, well bore casing structure and the requirement of going into operation confirm that perforating system is initiator and perforating gun, and rule of thumb perforating gun selects for use the perforation of bullet directly to be Φ 10mm.The structure of perforating system and connected mode are as shown in Figure 3.
2. confirm the Initiation Pressure of initiator according to casing wall thickness and well chamber situation, wear central tube so that perforating gun can be penetrated.
3. can confirm perforation number, perforation number of times and perforating depth according to the layering situation and the perforating bullet diameter of bittern concentration in the Rock-salt Cavity.Rule of thumb, the distance of the top sieve aperture of the general and screen casing in the perforation position on the central tube is 5-20m.
Look into bittern concentration distribution map in the 139# Rock-salt Cavity shown in Figure 2, can obtain the interior bittern concentration apart from top sieve aperture 8m place of central tube is 260g/L.To go out halogen concentration and be controlled at 300g/L, establishing the bittern flow percentage that needs to get at the sieve aperture place is X (bittern concentration is 329.4g/L here), and the bittern flow percentage that gets at the perforation place is Y (bittern concentration is 260g/L here), promptly has:
Known inner diameter of centerpipe is 115, and then the perforation diameter is 84.51mm, and perforation directly is that the bullet of Φ 10 needs 8～9, and can protect and levy out halogen concentration is about 300 g/L.
3.3 indoor preparation
1. select perforating system and priming system
2. perforating system and priming system are tested
3. assemble perforating gun and initiator
4. inspection dress rifle quality is correctly used priming system
3.4 site operation step
1. after perforation team arrives the well site, carry out the rifle polyphone by designing requirement and connect, initiator is installed.
2. connect well tool down.
3. fill in down rifle sketch map and work order.
4. supervise cable under the operation team, arrive desired depth down until cable.
5. carry out depth localization, the school is dark, according to the oil pipe table, calculates adjusted value, has revised the position of perforating system.
6. well head is installed, is ignited perforating gun, supervision perforating gun emission situation.As shown in Figure 4, initiator 4 is ignited perforating gun 5, and perforating bullet 6 penetrates in perforating gun 5, penetrates central tube 2, forms perforation 3.
7. survey the well head concentration of salt solution, until reaching designing requirement.
4, performance
4.1:2010 the morning on July 6,, following Φ 86 perforating guns (8 of Φ 10mm perforating bullets) (advance 1～2m) section perforation of salt deposit at well depth 1028.15-1029.15m.Take out gun barrel and find that its external diameter expansion is Φ 43mm to the maximum.Install the well head test manufacture, bittern concentration is 317g/L.
4.2:2010 afternoon on July 6,, following Φ 86 perforating guns (12 of Φ 10mm perforating bullets) still (advance 1～2m) section perforation of salt deposit at well depth 1028.15-1029.15m.Take out gun barrel and find that its external diameter expansion is Φ 48mm to the maximum.Install the well head test manufacture, bittern concentration is 312g/L.
4.3:2010 the morning on July 7,, following Φ 86 perforating guns (8 of Φ 10mm perforating bullets) (advance 0～1m) section perforation of salt deposit at well depth 1027.15-1028.15m.Take out gun barrel and find that its external diameter expansion is Φ 52mm to the maximum, install the well head test manufacture, bittern concentration is reduced to 306g/L gradually.
After resuming production, this well bittern concentration is stabilized in about 305g/L, and the well cavity pressure is stabilized under the situation of 3.0MPa, goes out the halogen stability of flow at 52m
3About/h, eliminated salt crystallization plugging phenomenon, the salty intended purposes that reached fully falls in this perforation.
5, economic and social benefits
5.1 output
139 wells implement perforation fall salty after, bittern production concentration is controlled at about 305 g/L, the bittern concentration that removes behind the oil pipe is about 295 g/L, by adopting halogen amount 50 m
3/ h produces 24H every day, and annual 330 days production times calculate, and can newly increase production halogen folding salt every year:
Ten thousand tons of ÷ 10.36 * 24 * 330=0.38 of G=50 * (3.05-2.95)
Implement simultaneously perforation fall salty after, can practice thrift about 30 days well workover time, by adopting halogen amount 50 m
3/ h produces 24h every day and calculates, and can newly increase production halogen folding salt:
Ten thousand tons of G=50 * 3.05 ÷, 10.36 * 24 * 30=1.06
Expectation halogen well is repaired and renovate frequency for once every two years, promptly increases 0.53 ten thousand ton of production capacity every year newly.
Add up to 0.91 ten thousand ton of annual newly-increased production capacity.
5.2 the output value
Can realize a year increase output value P
Produce=35.82 ten thousand yuan
5.3 benefit
With the consumption of output value deduction electric submersible pump, can generate profit P every year
Sharp=17.44 ten thousand yuan
5.4 it is energy-conservation
Implement perforation fall salty after, can effectively improve about bittern concentration 10 g/L, thereby reduce bittern production, conveying and salt manufacturing cost (influence the salt manufacturing cost by the salty amount of bittern of Sichuan 9da Salt Corporation is 0.52 yuan of/ton g calculating).Can save every year and prop up
Ten thousand yuan of E=50 * 3.05 ÷, 10.36 * 24 * 330 * 10 * 0.52=60.62
5.5 workover treatment expense
Play about 600,000 yuan of the operating cost of lower tubular column.An annual joint operation cost is 300,000 yuan.Adding up to the individual well economic benefit is 108.06 ten thousand yuan/year.
5.6 social benefit
This process safety height, good economy performance, simple to operate, be convenient to promote the use of.
It is the stratification according to bittern in the Rock-salt Cavity that salty central idea falls in perforation of the present invention, and promptly bittern concentration becomes greatly with the intensification of the degree of depth, opens and penetrates several holes stretching into central tube in the Rock-salt Cavity, changes the down-hole and goes out the halogen mode.Referring to Fig. 6, because the molten chamber of distance, perforation position base plate 14 is far away, bittern concentration is also lower, and therefore the bittern at this place is light bittern.Before the perforation, saturated bittern is directly produced ground through central tube 2 in the Rock-salt Cavity; After the perforation; As shown in Figure 6; Saturated bittern enters into screen casing 9 from sieve aperture 8 in the Rock-salt Cavity; Light bittern mixes with the saturated bittern that gets into from screen casing 9 in perforation 3 enters into central tube 2; Water distribution is fallen salty, forms sub-saturated bittern, and this sub-saturated bittern is returned out to ground by central tube 2; Effectively prevented crystallization, reached perforation and fallen salty purpose.
Beneficial effect of the present invention is: the injection that the present invention does not pass through to increase fresh water is with regard to the supersaturation bittern in the ability dilution tunnel; Use halogen concentration in suitable concentration range; Neither can cross the low cost of production that increases because of concentration; Also solved the problem that halogen excessive concentration bittern crystallization blocking pipe; Improve halogen well safety, efficient, quantity-produced ability, reduced the operating cost of a lower tubular column, practiced thrift the energy; Reduced cost of production, economic benefit and social benefit are all good.
Claims (7)
1. salt mine drilling solution mining device; Comprise central tube and sleeve pipe; Central tube is placed in the sleeve pipe; It is characterized in that: described central tube upper end and sleeve pipe upper end level; The sleeve pipe lower end is longer than in the central tube lower end; The central tube that exceeds the sleeve pipe lower end is provided with several perforations, is the bittern passage in the central tube.
2. a kind of salt mine drilling solution mining device according to claim 1 is characterized in that: also comprise the screen casing that is connected with the central tube lower end, have several sieve apertures on the screen casing.
3. a kind of salt mine drilling solution mining device according to claim 1 and 2, it is characterized in that: the annular space of described central tube and sleeve pipe is the fresh water passage.
4. a kind of salt mine drilling solution mining device according to claim 1 and 2 is characterized in that: the annular space of described central tube and sleeve pipe is observed passage for the well cavity pressure.
5. a kind of salt mine drill well water mixeding mining method that uses with claim 1 or 2 described matched with devices; Comprise drilling well, down manage, dissolve rock salt, produce halogen; It is characterized in that: described dissolve rock salt and produce halogen further comprising the steps of between the stage: (1) in Rock-salt Cavity, that measures central tube goes out halogen concentration with central tube; (2), get into and produce the halogen stage if the halogen concentration of measuring that goes out is in the bittern sub-saturated concentration range; If going out halogen concentration is higher than the sub-saturated upper limit of concentration, get into next step perforation program; (3) measure the bittern concentration of central tube perforation position and the bittern concentration that central tube enters the halogen place; The value of determining halogen concentration is in the bittern sub-saturated concentration range; According to the bittern concentration at two places that record with go out the percentage that halogen concentration calculates the bittern flow that bittern flow that the sieve aperture domestic demand gets into and perforation place need get into; Confirm the quantity and the size of perforation according to this percentage; Use perforating system on the perforation position of central tube, to open and penetrate some and a certain size perforation, measure halogen concentration; (4) still high if go out halogen concentration, perforation is in the bittern sub-saturated concentration range until going out halogen concentration repeatedly.
6. a kind of salt mine drill well water mixeding mining method according to claim 5 is characterized in that: described bittern sub-saturated concentration range is 295g/L～305g/L.
7. a kind of salt mine drill well water mixeding mining method according to claim 5 is characterized in that: the distance of the perforation position of said central tube and the top sieve aperture of screen casing is at a distance of 5-20m.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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