阅读说明：本技术 一种封闭式中深层地热能井下换热装置 (Closed type underground heat exchange device for middle-deep geothermal energy ) 是由 肖志斌 汪法 高长才 王浩磊 李庆 刘彪 陈旭 冯喆 张宇 于 2021-08-31 设计创作，主要内容包括：本发明涉及一种封闭式中深层地热能井下换热装置,包括取热内管、换热套管和支撑装置,支撑装置设于地热井地面上,取热内管的上端与支撑装置连接,取热内管的下端伸入地热井井底,换热套管套设于取热内管的下部,换热套管与地热井之间设有封隔器,支撑装置的侧面设有注水管,支撑装置的顶部设有与取热内管连接的出水管,取热内管的下端连接有筛管、配重管。本发明通过在取热内管下端连接有筛管,筛管能够对流经至取热内管的水流进行过滤后,再进入取热内管,筛管能够对将水流中的杂质阻隔在取热内管外,避免杂质对取热内管内壁的磨损,影响取热内管的使用寿命。(The invention relates to a closed underground heat exchange device for geothermal energy in a middle-deep layer, which comprises a heat taking inner pipe, a heat exchange sleeve and a supporting device, wherein the supporting device is arranged on the ground of a geothermal well, the upper end of the heat taking inner pipe is connected with the supporting device, the lower end of the heat taking inner pipe extends into the bottom of the geothermal well, the heat exchange sleeve is sleeved at the lower part of the heat taking inner pipe, a packer is arranged between the heat exchange sleeve and the geothermal well, a water injection pipe is arranged on the side surface of the supporting device, a water outlet pipe connected with the heat taking inner pipe is arranged at the top of the supporting device, and the lower end of the heat taking inner pipe is connected with a sieve pipe and a balance weight pipe. According to the invention, the sieve tube is connected to the lower end of the heat taking inner tube, the sieve tube can filter water flow flowing to the heat taking inner tube and then enters the heat taking inner tube, impurities in the water flow can be blocked outside the heat taking inner tube by the sieve tube, and the influence of the impurities on the abrasion of the inner wall of the heat taking inner tube on the service life of the heat taking inner tube is avoided.)

1. The utility model provides a closed well deep geothermal energy is heat transfer device in pit which characterized in that: including getting hot inner tube, heat transfer sleeve pipe and strutting arrangement, strutting arrangement locates geothermal well subaerial, get the upper end and the strutting arrangement connection of hot inner tube, get the lower extreme of hot inner tube and stretch into geothermal well shaft bottom, the lower part of getting hot inner tube is located to the heat transfer sleeve pipe cover, be equipped with the packer between heat transfer sleeve pipe and the geothermal well, strutting arrangement's side is equipped with the water injection pipe, strutting arrangement's top is equipped with and gets hot tube connection's outlet pipe, the lower extreme of getting hot inner tube is connected with screen pipe, counter weight pipe.

2. The closed type underground heat exchange device for deep geothermal energy, according to claim 1, is characterized in that: get hot inner tube including the first compound pipe, attach fitting, the compound pipe of second, connecting pipe, the compound pipe of third and communicating pipe that connect gradually, first compound pipe still is connected with strutting arrangement, communicating pipe still is connected with the screen pipe.

3. The closed type underground heat exchange device for the deep geothermal energy, as claimed in claim 2, wherein: the first composite pipe, the second composite pipe and the third composite pipe sequentially comprise an inner liner, a reinforcing layer and a protective layer from inside to outside, the inner liner and the protective layer are made of high-density polyethylene materials respectively, and the reinforcing layer is made of fiber reinforced materials.

4. The closed type underground heat exchange device for the deep geothermal energy, as claimed in claim 2, wherein: the supporting device comprises a flange pipe, the water injection pipe is connected with the outer surface of the top of the flange pipe, and the first composite pipe is connected with the inner surface of the top of the flange pipe.

5. The enclosed type underground heat exchange device for deep geothermal energy, according to claim 4, is characterized in that: and the flange pipe is provided with an exhaust valve.

6. The closed type underground heat exchange device for deep geothermal energy, according to claim 1, is characterized in that: the bottom end of the heat exchange sleeve is provided with an inclined plane which inclines upwards from the center to the periphery.

7. The closed type underground heat exchange device for deep geothermal energy, according to claim 1, is characterized in that: the method comprises the following construction steps:

step 1: adopting an underground television, an electric logging instrument and an electromagnetic flaw detector to judge the conditions in the well;

step 2: installing a heat exchange sleeve at the bottom of a well, and connecting the heat exchange sleeve with a geothermal well by adopting a packer to ensure that geothermal water is isolated in the sleeve;

and step 3: installing a supporting device at a wellhead, and respectively welding a water injection pipe and a water outlet pipe with the supporting device;

and 4, step 4: and (3) lowering the heat-taking inner pipe to the bottom of the heat exchange sleeve by adopting the mutual matching of a winch and a pulley device, and welding a flange joint of the heat-taking inner pipe on site after the lowering is finished and connecting the flange joint with a supporting device.

Technical Field

The invention relates to the technical field of geothermal energy heating, in particular to a closed type underground heat exchange device for middle-deep layer geothermal energy.

Background

The deep hole heat exchange technology is a technology for carrying out fluid circulation inside a single well through a coaxial sleeve in a deep well, and exchanging heat with a stratum based on a heat conduction mode so as to develop deep geothermal energy in a mode of 'taking heat without taking water'.

The current deep geothermal energy heat transfer device in, directly will get hot inner tube and insert in the geothermol power well, because contain impurity in the well, when walking away the water heat transfer, rivers can bring impurity into and get hot inner tube, long-time the use can lead to the fact wearing and tearing to getting the inner wall of hot inner tube, the life of the inner tube of getting hot is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing a closed underground heat exchange device for geothermal energy in a middle and deep layer and a crushing toothed roller device so as to solve the problems in the background technology.

The invention provides a closed underground heat exchange device for geothermal energy in a middle-deep layer, which comprises a heat taking inner pipe, a heat exchange sleeve and a supporting device, wherein the supporting device is arranged on the ground of a geothermal well, the upper end of the heat taking inner pipe is connected with the supporting device, the lower end of the heat taking inner pipe extends into the bottom of the geothermal well, the heat exchange sleeve is sleeved at the lower part of the heat taking inner pipe, a packer is arranged between the heat exchange sleeve and the geothermal well, a water injection pipe is arranged on the side surface of the supporting device, a water outlet pipe connected with the heat taking inner pipe is arranged at the top of the supporting device, and the lower end of the heat taking inner pipe is connected with a sieve pipe and a balance weight pipe.

Preferably, the heat-taking inner pipe comprises a first composite pipe, a connecting joint, a second composite pipe, a connecting pipe, a third composite pipe and a communicating pipe which are sequentially connected, the first composite pipe is further connected with the supporting device, and the communicating pipe is further connected with the sieve pipe.

In any of the above schemes, preferably, the first composite pipe, the second composite pipe and the third composite pipe sequentially include an inner liner, a reinforcing layer and a protective layer from inside to outside, the inner liner and the protective layer are made of high-density polyethylene materials respectively, and the reinforcing layer is made of fiber reinforced materials.

In any one of the above schemes, preferably, the supporting device comprises a flange pipe, the water injection pipe is connected with the outer surface of the top of the flange pipe, and the first composite pipe is connected with the inner surface of the top of the flange pipe.

In any of the above schemes, preferably, the flange pipe is provided with an exhaust valve.

In any of the above schemes, preferably, the bottom end of the heat exchange sleeve is provided with an inclined plane which inclines upwards from the center to the periphery.

In any of the above aspects, the method preferably includes the following construction steps:

step 1: adopting an underground television, an electric logging instrument and an electromagnetic flaw detector to judge the conditions in the well;

step 2: installing a heat exchange sleeve at the bottom of a well, and connecting the heat exchange sleeve with a geothermal well by adopting a packer to ensure that geothermal water is isolated in the sleeve;

and step 3: installing a supporting device at a wellhead, and respectively welding a water injection pipe and a water outlet pipe with the supporting device;

and 4, step 4: and (3) lowering the heat-taking inner pipe to the bottom of the heat exchange sleeve by adopting the mutual matching of a winch and a pulley device, and welding a flange joint of the heat-taking inner pipe on site after the lowering is finished and connecting the flange joint with a supporting device.

Compared with the prior art, the invention has the advantages and beneficial effects that:

1. through being connected with the screen pipe at getting hot inner tube lower extreme, the screen pipe can filter the back to getting hot inner tube's rivers flowing through, gets into again and gets hot inner tube, and the screen pipe can be to getting hot inner tube outside impurity separation in the rivers, avoids impurity to getting the wearing and tearing of hot inner tube inner wall, the life of getting hot inner tube of influence.

2. Through being connected with the counter weight pipe at getting hot inner tube lower extreme, be convenient for get hot inner tube on the one hand and transfer to the shaft bottom, on the other hand can reduce rivers to getting the buoyancy effect of hot inner tube, the influence gets the mounting structure stability of hot inner tube.

3. Through being equipped with the packer between heat transfer sleeve pipe and geothermal well, can effectively with shaft bottom groundwater and circulating water separation, avoid groundwater and circulating water contact, influence heat exchange efficiency.

The enclosed type underground heat exchange device for geothermal energy in middle and deep layers of the invention is further explained with reference to the attached drawings.

Drawings

FIG. 1 is a schematic structural diagram of a closed underground heat exchange device for geothermal energy in a middle and deep layer;

FIG. 2 is a schematic structural diagram of a heat-extraction inner tube of a closed underground heat exchange device for middle-deep geothermal energy according to the present invention;

FIG. 3 is a cross-sectional view of the composite tubes in the heat extraction inner tube;

FIG. 4 is a construction structure diagram of a closed type underground heat exchange device for middle and deep layer geothermal energy according to the present invention;

wherein: 1. a water injection pipe; 2. a geothermal well; 3. a packer; 4. a heat exchange sleeve; 5. a counterweight pipe; 6. a screen pipe; 7. a heat-taking inner pipe; 71. an inner liner layer; 72. an enhancement layer; 73. a protective layer; 74. a first clad pipe; 75. connecting a joint; 76. a second composite tube; 77. a connecting pipe; 78. a third composite tube; 79. a communicating pipe; 8. a flange pipe; 9. a water outlet pipe; 10. an exhaust valve; 11. a winch; 12. a pulley device.

Detailed Description

As shown in figure 1, the invention provides a closed type underground heat exchange device for geothermal energy in a middle-deep layer, which comprises a heat taking inner pipe 7, a heat exchange sleeve 4 and a supporting device, wherein the supporting device is arranged on the ground of a geothermal well 2, the upper end of the heat taking inner pipe 7 is connected with the supporting device, the lower end of the heat taking inner pipe 7 extends into the bottom of the geothermal well 2, the heat exchange sleeve 4 is sleeved at the lower part of the heat taking inner pipe 7, a packer 3 is arranged between the heat exchange sleeve 4 and the geothermal well 2, a water injection pipe 1 is arranged on the side surface of the supporting device, a water outlet pipe 9 connected with the heat taking inner pipe 7 is arranged at the top of the supporting device, and the lower end of the heat taking inner pipe 7 is connected with a sieve pipe 6 and a balance weight pipe 5.

Wherein, the sieve tube 6 is provided with a plurality of sieve holes. The weight pipe 5 includes a weight and a weight connecting pipe 77 connected to the weight.

Cold water is injected through the water injection pipe 1, water flows through the geothermal well 2 and enters the heat taking inner pipe 7 from the well bottom through the sieve pipe 6 after being heated, and returns to the water outlet pipe 9, and then is conveyed to the heat supply end, and the circulation is carried out according to the above steps, so that the underground heat collection of the geothermal energy is completed.

In this embodiment, be connected with screen pipe 6 through getting 7 lower extremes of hot inner tube, screen pipe 6 can filter the back to getting the rivers of hot inner tube 7 through flowing through, and the reentrant gets hot inner tube 7, and screen pipe 6 can be outside getting hot inner tube 7 to the impurity separation in the rivers, avoids impurity to get the wearing and tearing of hot inner tube 7 inner wall, influences the life who gets hot inner tube 7.

Through being connected with counter weight pipe 5 at getting 7 lower extremes of hot inner tube, be convenient for get hot inner tube 7 on the one hand and transfer to the shaft bottom, on the other hand can reduce rivers and to getting the buoyancy effect of hot inner tube 7, influence the mounting structure stability of getting hot inner tube 7.

Through being equipped with packer 3 between heat transfer sleeve 4 and geothermal well 2, can effectively with shaft bottom groundwater and circulating water separation, avoid groundwater and circulating water contact, influence heat exchange efficiency.

Further, as shown in fig. 2, the heat-extraction inner pipe 7 includes a first composite pipe 74, a connection joint 75, a second composite pipe 76, a connection pipe 77, a third composite pipe 78, and a communication pipe 79, which are connected in sequence, the first composite pipe 74 is further connected to the support device, and the communication pipe 79 is further connected to the screen 6.

Wherein, the connection joint 75 is a stainless steel joint. Two ends of the connecting joint 75 are respectively in threaded connection with the lower end of the first composite pipe 74 and the upper end of the second composite pipe 76, two ends of the connecting pipe 77 are respectively in welded connection with the lower end of the second composite pipe 76 and the upper end of the third composite pipe 78, and the lower end of the third composite pipe 78 is in threaded connection with the upper end of the communicating pipe 79. The lower end of the communicating pipe 79, the screen pipe 6 and the counterweight pipe 5 are welded.

The structure of the heat extraction inner pipe 7 in the embodiment is suitable for three well opening depths, the pipe diameters of the first composite pipe 74 and the second composite pipe 76 are the same, the pipe diameter of the second composite pipe 76 is larger than that of the third composite pipe 78, and the large-small-head connecting pipe 77 is selected as the connecting pipe 77 between the second composite pipe 76 and the third composite pipe 78 to connect the second composite pipe 76 and the third composite pipe 78.

In addition, the heat-taking inner pipe 7 is selected according to the required well opening depth, and the length and the pipe diameter of the composite pipe are selected according to the actual construction requirement.

Further, as shown in fig. 3, the first composite pipe 74, the second composite pipe 76 and the third composite pipe 78 sequentially include an inner liner 71, a reinforcing layer 72 and a protective layer 73 from inside to outside, the inner liner 71 and the protective layer 73 are made of high-density polyethylene materials, and the reinforcing layer 72 is made of fiber reinforced materials.

The inner liner 71 of the composite pipe has the function of reducing the flow resistance of water, the heat exchange circulation efficiency is guaranteed, the protective layer 73 has the function of corrosion prevention, the enhancement layer 72 has the function of enhancing the overall structural strength of the heat-taking inner pipe 7, and the enhancement layer 72 and the protective layer 73 are arranged to guarantee the service life of the heat-taking inner pipe 7.

The composite pipe is manufactured by adopting a three-layer structure form and a full-fusion process, the reinforcing layer 72, the lining layer 71 and the protective layer 73 are fused into a whole, the layers are combined through chemical bonds, acting force is firm, the design form enables the central pipe to have excellent internal and external pressure resistance, stretch resistance, good flexibility, difficulty in scaling, low heat conductivity coefficient, corrosion resistance, high temperature resistance, convenience in construction and the like.

Further, the supporting means includes a flange pipe 8, the water injection pipe 1 is connected to the top outer surface of the flange pipe 8, and the first clad pipe 74 is connected to the top inner surface of the flange pipe 8.

Furthermore, the flange pipe 8 is provided with an exhaust valve 10, which can exhaust gas generated in the well and ensure the balance of pressure inside and outside the well.

Furthermore, the bottom end of the heat exchange sleeve 4 is provided with an inclined plane which inclines upwards from the center to the periphery. The structure has a slow flow effect on water flowing to the position, and reduces the impact force of water flow on the bottom of the sleeve, so that the service life of the heat exchange sleeve 4 is prolonged.

As shown in FIG. 3, the specific construction steps of the closed type underground heat exchange device for the geothermal energy at the middle and deep layers of the invention are as follows:

step 1: and (4) adopting an underground television, an electric logging instrument and an electromagnetic flaw detector to judge the conditions in the well.

If the well pipe is damaged, the stratum sand-mud mixture enters the well to cause bridging or objects falling in the well to block a target layer, the descending position of the heat exchange central pipe and the heat exchange effect are influenced, and well dredging and dredging are needed.

Step 2: a heat exchange sleeve 4 is arranged at the bottom of a well, and the heat exchange sleeve 4 is connected with a geothermal well 2 by a packer 3, so that geothermal water is isolated in the sleeve.

And step 3: and installing a supporting device at the wellhead, and respectively welding the water injection pipe 1 and the water outlet pipe 9 with the supporting device.

And 4, step 4: the heat-taking inner pipe 7 is placed to the bottom of the heat exchange sleeve 4 by mutually matching a winch 11 and a pulley device 12, and after the heat-taking inner pipe 7 is placed, a flange joint of the heat-taking inner pipe 7 is welded on site and connected with a supporting device.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.