TWI418837B - Injection device, injection system and injection method using the same - Google Patents

Description

Injection device and injection system and injection method thereof

The present invention relates to an injection device and an injection system and an injection method therefor, and more particularly to an injection device for reducing the fouling rate in a geothermal well, and an injection system and an injection method using the same.

Geothermal wells can extract geothermal energy thousands of meters deep into the ground. However, the ground has a lot of geothermal water, and the carbon dioxide (CO ₂ ) dissolved in the geothermal water is dissipated when the geothermal water reaches a flash point, so that calcium carbonate (CaCO ₃ ) scales out. Calcium carbonate scaling blocks the wellbore of geothermal wells and reduces the capacity of geothermal wells. Traditionally, scale inhibitors have been injected into geothermal wells for a certain period of time to slow down the precipitation of calcium carbonate scale.

However, the geothermal water still reaches the flash point at other locations in the geothermal well, and the fixed-point injection device cannot inhibit the precipitation of calcium carbonate scale at the other locations.

The invention relates to an injection device and an injection system and an injection method thereof. The plurality of injection devices are respectively located at different depths of the geothermal well to inject the scale inhibitor at different depth positions in the geothermal well, thereby reducing the geothermal well Fouling at different depth locations within.

According to a first aspect of the invention, an injection system is presented. A fouling inhibitor is injected into the geothermal well through the injection system. The injection system includes a first injection device and a second injection device. The first injection device is located at a first depth position within the geothermal well, and the scale inhibitor is injected into the geothermal well via the first injection device. The second injection device is located at one of the second depth locations in the geothermal well, and the scale inhibitor is injected into the geothermal well via the second injection device.

According to a second aspect of the invention, an injection device is presented. A fouling inhibitor is injected into the geothermal well through the injection device. The injection device includes a body and a liquid storage chamber. The body has an infusion channel and a jet channel. The reservoir is located in the body. Wherein the infusion channel is connected to the liquid storage chamber, and the first part of the scale inhibitor is transferred to the liquid storage chamber via the infusion channel, and the first part of the scale inhibitor stored in the liquid storage chamber is ejected from the injection channel to the geothermal well, and the knot is The second portion of one of the scale inhibitors is transferred to the next injection device via the infusion channel.

According to a third aspect of the invention, an injection method is proposed. The injection method is used to inject a scale inhibitor into a geothermal well. The injection method includes the following steps. Detecting a scale trace in the geothermal well, selecting a first depth position and a second depth position as the injection position according to the scale trace; placing an injection system into the geothermal well; and pushing the scale inhibitor into the injection A system wherein a scale inhibitor is injected into a geothermal well via an injection system and at a first depth location and a second depth location.

In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

Please refer to FIG. 1 , which is a schematic diagram of an injection system in accordance with a preferred embodiment of the present invention. The injection system 100 includes a first injection device 102, a second injection device 102, a third injection device 106, a pipe fitting device 116, a first pipe member 108, a second pipe member 110 and a third pipe member 112, a power source pipe member 114, and a weight 132. .

The first injection device 102, the second injection device 104, and the third injection device 106 are respectively located at different depths of the geothermal well S to inject the scale inhibitor Q into different depth positions in the geothermal well S, thereby reducing the geothermal well S Fouling at different depth locations.

The first injection device 102 is located at a first depth position P1 in the geothermal well S, the second injection device 104 is located at a second depth position P2 within the geothermal well S, and the third injection device 106 is located at a third depth position within the geothermal well S P3. The first portion Q1, the second portion Q2, and the third portion Q3 of the scale inhibitor Q can be simultaneously and continuously injected into the geothermal well S by the first injection device 102, the second injection device 104, and the third injection device 106, respectively. Different depth positions. The third depth position P3 is deeper than the second depth position P2, and the second depth position P2 is deeper than the first depth position P1. The first portion Q1 of the scale inhibitor Q, the second portion Q2, and the third portion Q3 are each independently transferred from the tube fitting device 116 to the corresponding injection device.

The weight 132 allows the injection system 100 to be more easily lowered to a predetermined depth within the geothermal well S and to increase the overall stability of the injection system 100 within the geothermal well S, thereby avoiding random sway of the injection system 100. In addition, the third tube member 112 is located within the weight 132 to reduce the degree of sway of the third tube member 112.

Please refer to FIG. 2, which is a cross-sectional view showing the tube fitting device of FIG. 1. The tube fitting device 116 integrates the first tube member 108, the second tube member 110, and the third tube member 112. The first tube 108 has an opposite first end 108a (the first end 108a is shown in FIG. 7) and the second end 108b, and the second tube 110 has a first end 110a (the first end 110a is shown in the 13th The first end 112a (the first end 112a is shown in Fig. 15) and the second end 112b are opposite to the second end 110b and the third tube 112. The second end 108b of the first tubular member 108, the second end 110b of the second tubular member 110, and the second end 112b of the third tubular member 112 are coupled to the tubular fitting device 116 to be constrained by the tubular fitting device 116 to reduce the degree of sloshing.

The tube fitting device 116 has an integrated reservoir chamber 116a. The second end 108b of the first tubular member 108, the second end 110b of the second tubular member 110, and the second end 112b of the third tubular member 112 are coupled to the integrated reservoir 116. The power source tube 114 is connected to the integrated liquid storage chamber 116 and a power source (not shown). The scale inhibitor Q is transmitted to the integrated liquid storage chamber 116 via the power source tube 114, and then passed through the first tube member 108 and the second tube member. The 110 and third tubes 112 are transferred to the first injection device 102, the second injection device 104, and the third injection device 106.

Referring to Fig. 3, a cross-sectional view taken along line 3-3' in Fig. 2 is shown. The tube fitting device 116 further includes a securing member 120. The fixing member 120 is, for example, a connecting valve that is fixedly coupled to the power source tube member 114 to prevent the power source tube member 114 from falling off and arbitrarily shaking. Please refer to Fig. 4, which is a cross-sectional view taken along line 4-4' in Fig. 2. The injection system 100 further includes a first pressure valve 122, a second pressure valve (not shown), and a third pressure valve (not shown), and the first pressure valve 122, the second pressure valve, and the third pressure valve are respectively connected to the first The second end 108b of the tubular member 108, the second end 110b of the second tubular member 110, and the second end 112b of the third tubular member 112.

Taking the connection of the first pressure valve 122 and the first pipe member 108 as an example, please refer to FIG. 5, which is a schematic view showing the connection between the first pressure valve and the first pipe member of the embodiment. The first pressure valve 122 includes a stopper 122a, a valve 122b, an elastic member 122c, and a body 122d. The stopper 122a is locked to the valve body 122d, and the elastic member 122c is, for example, a spring that connects the valve 122b and the valve body 122d. The stopper 122a has a first passage 122e, and the valve body 122d has a second passage 122f. Wherein, the first passage 122e is selectively in communication with the second passage 122f. In detail, when the application force of the scale inhibitor Q is greater than the elastic force of the elastic member 122c of the first pressure valve 122, the scale inhibitor Q The valve 122a of the first pressure valve 122 is pushed to communicate the first passage 122e with the second passage 122f, and then the scale inhibitor Q is transmitted to the first tubular member 108 via the second passage 122f.

The first pressure valve 122 of the present embodiment has a non-return function to prevent the geothermal fluid from recoiling to the tube fitting device 116. Further, the geothermal fluid in the geothermal well S is rather unstable in its nature and pressure state, and sometimes the pressure of the geothermal fluid suddenly increases and backflushed to the tube fitting device 116. In the present embodiment, when the fluid pressure of the local hot well S is greater than the pressure of the scale inhibitor Q to push the valve 122a, the valve 122a is pushed into contact with the stopper 122a to shield the first passage 122e, and the geothermal well S has the geothermal heat. The fluid therefore cannot be backflushed into the power source tube 114 to prevent it from damaging the power source. Also, since the valve 122a is stopped by the stopper 122a, the first passage 122e is continuously maintained in the closed state before the sudden increase pressure of the geothermal fluid of the geothermal well S is lowered.

In addition, by adjusting the compression length or elastic modulus of the elastic member 122c of the first pressure valve 122, the opening distance between the first passage 122e and the valve 122b can be controlled to allow the expected flow rate of the scale inhibitor Q to enter the first tubular member. 108.

The connection characteristics of the second pressure valve and the second pipe member 110 and the connection characteristics of the third pressure valve and the third pipe member 112 are similar to the connection features of the first pressure valve 122 and the first pipe member 108, and the description thereof will not be repeated.

In other embodiments, a tube fitting may also be substituted for the tube fitting device 116. Please refer to FIG. 6 , which is a schematic view showing the integration of the pipe fittings according to other embodiments of the present invention. Injection system 100 includes an integrated tubular member 128 having a first end 128a and a second end 128b. The first end 128a of the integrated tubular member 128 is coupled to the second end 108b of the first tubular member 108, the second end 110b of the second tubular member 110, and the second end 112b of the third tubular member 112. The second end 128b of the integrated tubular member 128 is coupled to a power source for pressurizing the scale inhibitor Q to deliver the scale inhibitor Q to each of the injection devices. In other embodiments, the power source may be omitted and transmitted to the first injection device 102, the second injection device 104, and the third injection device 106 in the depth direction by the gravity of the scale inhibitor Q.

Please refer to FIGS. 7 to 8. FIG. 7 is a cross-sectional view of the first injection device of FIG. 1, and FIG. 8 is a cross-sectional view taken along line 8-8' of FIG. As shown in Fig. 7, the first injection device 102 includes a first body 102h and a first reservoir 102d, and the first reservoir 102d is located within the first body 102h. The first body 102h has a first infusion channel 134, a plurality of first infusion channels 102f, and an outer surface 102g. As shown in Fig. 8, the first injection passages 102f are disposed equidistantly around the first liquid storage chamber 102d, and the first injection passages 102f are penetrated from the first liquid storage chamber 102d to the outer surface 102g. The first end 108a of the first tube 108 is connected to the first reservoir 102d inside the first injection device 102 via the first infusion channel 134, and the first portion Q1 of the scale inhibitor Q is transmitted to the first reservoir via the first tube 108 The liquid chamber 102d is stored and ejected from the first injection passage 102f to the geothermal well S. In addition, the first end 110a of the second tubular member 110 is coupled to the second injection device 104 via the first infusion channel 134. The first end 112 a of the third tube 112 (the first end 112 a is shown in FIG. 15 ) is connected to the third injection device 106 via the first infusion channel 134 and the second injection device 104 .

In addition, the first body 102h may include a nozzle (not shown) disposed in the first injection passage 102f to generate a plurality of injection angles of the first portion Q1 of the scale inhibitor Q sprayed from the first injection passage 102f. Changes in scope.

The first tube member 108, the second tube member 110, and the third tube member 112 are prevented from being excessively shaken in the geothermal well S by the restraint of the injection device. Further, the second tube member 110 is connected to the second injection device 104 via the inside of the first injection device 102 (the second injection device 104 is shown in FIG. 13), and the third tube member 112 is connected to the inside of the first injection device 102. The inside of the second injection device 104 is connected to the third injection device 106 (the third injection device 106 is shown in FIG. 15). The first tube member 108, the second tube member 110, and the third tube member 112 are restrained by the injection device when being injected into the interior of the device, so that the degree of shaking in the geothermal well S can be reduced. For example, the second tube member 110 and the third tube member 112 are bound to the first injection device 102. Referring to Figure 9, a cross-sectional view taken along line 9-9' in Fig. 7 is shown. The injecting system 100 further includes two fixing members 130 for fixing the second tube member 110 and the third tube member 112 to the first injecting device 102 respectively, thereby reducing the degree of shaking of the second tube member 110 and the third tube member 112 in the geothermal well S.

In addition, please return to FIG. 8 , the second tube member 110 and the third tube member 112 pass through the first liquid storage chamber 102 d , which is not used to limit the present invention, and at least one of the second tube member and the third tube member may also be used. Isolated from the first reservoir. For example, in other embodiments, reference is made to FIG. 10, which is a cross-sectional view of a first injection device of an injection system in accordance with an embodiment of the present invention. The first injection device 202 includes a first body 202h and a first reservoir 202d, and the first reservoir 202d is located within the first body 202h. The first body 202h has a first infusion channel 234, a plurality of first injection channels 202f, and an outer surface 202g. The first injection channel 202f extends from the first reservoir 202d to the outer surface 202g. The first infusion channel 234 includes a first reservoir channel 202a, a first delivery channel 202b, and a second delivery channel 202c. The first infusion channel 202b is connected to the first reservoir 202d, and the first channel 202b and the second channel 202c are isolated from the first reservoir 202d. The second tube member 110 and the third tube member 112 respectively pass through the first conveying passage 202b and the second conveying passage 202c. Thus, the second tube member 110 and the third tube member 112 are separated from the first liquid storage chamber 202d. In other implementations, the first tube member 108, the second tube member 110, and the third tube member 112 may be omitted. The scale inhibitor Q may be directly connected to the first liquid storage channel 202a, the first transmission channel 202b, and the second transmission channel. Transfer within 202c.

In addition, in another embodiment, the first transmission channel 202b and the second transmission channel 202c of FIG. 10 may also pass through the first reservoir 202d. Referring to Figures 11 and 12, Figure 11 is a cross-sectional view of a first injecting device of an infusion system in accordance with another embodiment of the present invention, and Figure 12 is a cross-sectional view of Figure 11 in a direction 12-12'. As shown in FIG. 11, another embodiment of the injection system includes a first injection device 302, a second injection device (not shown), and a third injection device (not shown). Taking the first injection device 302 as an example, the first injection device 302 has a first body 302h and a first liquid storage chamber 302d, and the first liquid storage chamber 302d is located in the first body 302h. The first body 302h has a first liquid storage passage 302a, a first transmission passage 302b, a second transmission passage 302c, an outer surface 302g, and a plurality of first injection passages 302f. The first injection passage 302f penetrates from the first liquid storage chamber 302d to the outer surface 302g, and the first transmission passage 302b and the second transmission passage 302c are isolated from the first device reservoir 302d. The first portion Q1 of the scale inhibitor Q is transferred to the first injection device 302 via the first reservoir channel 302a and then ejected to the geothermal well S via the first injection channel 302f, and the second portion Q2 of the scale inhibitor Q is passed through the first The transfer channel 302b is transmitted to the second injection device, and the third portion Q3 of the scale inhibitor Q is transmitted to the second injection device via the second transfer channel 302c and then to the third injection device via the second injection device.

Referring to Figures 13 and 14, Figure 13 is a cross-sectional view of the second injection device of Figure 1, and Figure 14 is a cross-sectional view of Figure 14 along the direction 14-14'. The second injection device 104 includes a second body 104h and a second reservoir 104d, and the second reservoir 104d is located within the second body 104h. The second body 104h has a second infusion channel 136, a plurality of second injection channels 104f and an outer surface 104g. The second injection channels 104f are equally spaced around the first reservoir 104d, and the second injection channel 104f is from the second. The reservoir 104d extends through the outer surface 104g. The first end 110a of the second tube member 110 is connected to the second reservoir chamber 104d of the second injection device 104 via the second infusion channel 136, and the second portion Q2 of the scale inhibitor Q is transferred to the second reservoir chamber 104d for storage and It is ejected from the second injection passage 104f into the geothermal well S. The first end 112a of the third tubular member 112 is coupled to the third infusion device 106 via a second infusion channel 136.

Referring to Figure 15, a cross-sectional view of the third injection device of Figure 1 is shown. The third injection device 106 includes a third body 106h and a third liquid storage chamber 106d, and the third liquid storage chamber 106d is located within the third body 106h. The third body 106h has a third infusion channel 138, a plurality of third injection channels 106f and an outer surface 106g. The third injection channels 106f are disposed equidistantly around the third reservoir 106d. The third injection passage 106f penetrates from the third liquid storage chamber 106d to the outer surface 106g. The first end 112a of the third tube member 112 is connected to the third reservoir chamber 106d of the third injection device 106 via the third infusion channel 138, and the third portion Q3 of the scale inhibitor Q is transmitted to the third reservoir via the third tube member 112. The liquid chamber 106d is stored and ejected from the third injection passage 106f into the geothermal well S.

Although the number of the injection systems of the above embodiments is illustrated by three, the present invention is not limited thereto. In other embodiments, the number of injection devices of the injection system 100 may be only two, such as the first injection device 102 and the second injection device 104. In this case, the third injection device 106 and the third may be omitted. The tube 112; or the number of injection devices of the injection system 100 exceeds three, in which case the injection system further includes the same number of tubes as the injection device.

Please refer to FIG. 16, which is a flow chart of an injection method of an injection system in accordance with a preferred embodiment of the present invention. The injection system 100 of Fig. 1 will be described as an example.

In step S102, a scale trace in the geothermal well S is detected. For example, a probe line (not shown) is carried into the geothermal well S by means of a heavy hammer, and after a suitable time (for example, at least one day or more), it is pulled up to observe the scale trace.

In step S104, the estimated injection depth position is selected according to the scale trace of each depth obtained in step S102. For example, the first depth position P1, the second depth position P2, and the third depth position P3 having a larger amount of fouling are selected as the injection position depending on the amount of fouling.

In step S106, the injection system 100 shown in Fig. 1 is placed in the injection position in the geothermal well S. For example, after the injection system 100 is placed, the first injection device 102 is at the first depth position P1, the second injection device 104 is at the second depth position P2, and the third injection device 106 is at the third depth position P3.

In step S108, a power source (not shown) pushes the scale inhibitor Q into the injection system 100, and the scale inhibitor Q is transmitted to the first injection device 102, the second injection device 104, and the third injection device 106 to a first depth position P1, a second depth position P2, and a third depth position P3, wherein the first portion Q1 of the scale inhibitor Q is injected into the geothermal well S via the first injection device 102, and the second portion of the scale inhibitor Q Q2 is injected into the geothermal well S via the second injection device 104, and the third portion Q3 of the fouling inhibitor Q is injected into the geothermal well S via the third injection device 106.

The injection device and the injection system and the injection method using the same according to the above embodiments of the present invention, the plurality of injection devices are respectively located at different depth positions of the geothermal well to simultaneously inject the scale inhibitor at different depth positions in the geothermal well, thereby reducing geothermal heat Fouling at different depth locations within the well.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100. . . Injection system

102, 202. . . First injection device

102d. . . First reservoir

102f. . . First injection channel

102g. . . The outer surface

102h. . . First ontology

104. . . Second injection device

104d. . . Second reservoir

104f. . . Second injection channel

104g. . . The outer surface

106. . . Third injection device

106d. . . Third reservoir

106f. . . Third injection channel

106g. . . The outer surface

108. . . First pipe fitting

108a, 110a, 112a, 128a. . . First end

108b, 110b, 112b, 128b. . . Second end

110. . . Second pipe fitting

112. . . Third pipe fitting

114. . . Power source pipe fittings

116. . . Pipe fitting device

116a. . . Integrated reservoir

120, 130. . . Fixed component

122. . . First pressure valve

122a. . . Stop

122b. . . valve

122c. . . Elastic component

122d. . . Valve body

122e. . . First channel

122f. . . Second channel

128. . . Integrated fitting

132. . . Heavy hammer

134. . . First infusion channel

136. . . Second infusion channel

138. . . Third infusion channel

202a. . . First liquid storage channel

202b. . . First transmission channel

202c. . . Second transmission channel

202d. . . First reservoir

P1. . . First depth position

P2. . . Second depth position

P3. . . Third depth position

S. . . Geothermal well

Q. . . Scale inhibitor

Q1. . . The first part of the scale inhibitor

Q2. . . The second part of the scale inhibitor

Q3. . . The third part of the scale inhibitor

1 is a schematic view of an injection system in accordance with a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view showing the pipe fitting device of Fig. 1.

Fig. 3 is a cross-sectional view taken along line 3-3' in Fig. 2.

Fig. 4 is a cross-sectional view taken along line 4-4' in Fig. 2.

FIG. 5 is a schematic view showing the connection between the first pressure valve and the first pipe member of the embodiment.

Figure 6 is a schematic view showing the integration of the pipe fittings according to other embodiments of the present invention.

Fig. 7 is a cross-sectional view showing the first injection device of Fig. 1.

Fig. 8 is a cross-sectional view taken along line 8-8' in Fig. 7.

Fig. 9 is a cross-sectional view taken along line 9-9' in Fig. 7.

Figure 10 is a cross-sectional view showing a first injection device of an injection system in accordance with an embodiment of the present invention.

11 is a cross-sectional view of a first injection device of an implantation system in accordance with another embodiment of the present invention.

Fig. 12 is a cross-sectional view taken along line 12-12' in Fig. 11.

Figure 13 is a cross-sectional view showing the second injection device of Figure 1.

Fig. 14 is a cross-sectional view taken along line 14-14' in Fig. 13.

Figure 15 is a cross-sectional view showing the third injection device of Figure 1

Figure 16 is a flow chart showing an injection method of an injection system in accordance with a preferred embodiment of the present invention.

100. . . Injection system

102. . . First injection device

104. . . Second injection device

106. . . Third injection device

108. . . First pipe fitting

110. . . Second pipe fitting

112. . . Third pipe fitting

114. . . Power source pipe fittings

116. . . Pipe fitting device

P1. . . First depth position

P2. . . Second depth position

P3. . . Third depth position

S. . . Geothermal well

Q. . . Scale inhibitor

Q1. . . The first part of the scale inhibitor

Q2. . . The second part of the scale inhibitor

Q3. . . The third part of the scale inhibitor

Claims (10)

An injection system through which a fouling inhibitor is injected into a geothermal well, the injection system comprising: a first injection device located at a first depth position in the geothermal well, the scale inhibitor via the first An injection device is injected into the geothermal well; and a second injection device is located at a second depth position in the geothermal well, and the scale inhibitor is injected into the geothermal well via the second injection device. The injection system of claim 1, further comprising: a first tube member having a first end, the first end of the first tube member being connected to the inside of the first injection device to cause the scaling The inhibitor is transferred to the first injection device via the first tube; and a second tube has a first end, the first end of the second tube is connected to the inside of the second injection device, the scale inhibition The agent is delivered to the second injection device via the second tube. The injection system of claim 1, wherein the first injection device has a first liquid storage chamber, a first transmission channel and a first liquid storage channel, wherein the first liquid storage channel is connected to the first a reservoir chamber, a first portion of the scale inhibitor is delivered to the first reservoir via the first reservoir channel, and a second portion of the scale inhibitor is transmitted to the first portion via the first delivery channel Two injection devices. The injection system of claim 3, further comprising: a first tube member having a first end, the first end of the first tube member being connected to the first liquid storage via the first liquid storage passage Venting the first portion of the scale inhibitor to the first reservoir via the first tubular member; and a second tubular member having a first end, the first end of the second tubular member being through the first A transmission channel is coupled to the second injection device, and the second portion of the scale inhibitor is delivered to the second injection device via the second tube. The injection system of claim 1, further comprising: a third injection device located at a third depth position in the geothermal well, the scale inhibitor is injected into the geothermal well by the third injection device . An injection device through which a fouling inhibitor is injected into a geothermal well, the injection device comprising: a body having an infusion channel and a jet channel; and a reservoir located in the body; wherein the infusion a passage is connected to the liquid storage chamber, and a first portion of the fouling inhibitor is transported to the liquid storage chamber via the infusion channel, and the first portion stored in the liquid storage chamber is ejected from the injection channel to the geothermal well. A second portion of one of the scale inhibitors is transferred to the next injection device via the infusion channel. The injection device of claim 6, wherein a first tube is connected to the reservoir via the infusion channel, and a second tube is connected to the next injection device via the infusion channel. The infusion device of claim 6, wherein the infusion channel comprises: a liquid storage channel connected to the liquid storage chamber, the first portion of the scale inhibitor is transmitted to the reservoir via the liquid storage channel a liquid chamber; and a transfer passage through which the second portion of the scale inhibitor is delivered to the next injection device. The injection device of claim 8, wherein a first tubular member is connected to the liquid storage chamber via the liquid storage passage, and a second tubular member is connected to the next injection device via the transmission passage. An injection method for injecting a scale inhibitor into a geothermal well, the injection method comprising: detecting a scale trace in the geothermal well; and selecting a first depth position and a second depth according to the fouling trace Positioning as an injection location; and placing an injection system into the geothermal well; and pushing the scale inhibitor into the injection system, wherein the scale inhibitor passes through the injection system and at the first depth position and the second The depth position is injected into the geothermal well.