Large-diameter horizontal injection-production integrated oil production single-cylinder double-well device

Abstract

The present application relates to the technical field of oil production well, especially to a large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, which comprises a single-cylinder double-well base, an injection well and a collection well arranged on the single-cylinder double-well base; a horizontal tubing hanger is arranged in the injection well; the horizontal tubing hanger comprises a connecting main body, a first channel and a second channel arranged on the connecting main body; the first channel and the second channel are in communication; an injection end is arranged on the injection well, and the injection end and the second channel are in communication; the injection well and the collection well of the present application operate independently, and one injection and one production operation is carried out; in this process, the stability of the reservoir pressure can be maintained, and continuous oil production can be realized without waiting time; the injected water can immediately fill the reservoir space after the produced crude oil is produced by the oil production well, there is no time difference of "formation depletion", and the formation skeleton is always in a pressure supporting state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production wells, in particular to a large-diameter horizontal injection-production integrated oil production single-cylinder double-well device. BACKGROUND

[0002] Traditionally, only two oil production wells or two water injection wells can be arranged in a 36-inch conductor, which is difficult to accommodate two large-diameter injection-production integrated oil production single-cylinder double-well devices. However, the number of well slots on offshore platforms is limited. If only double oil production well or double water injection well structure is used, the following problems will be faced: first, the efficiency of oil production and water injection needs to be highly matched. Once unbalanced, it is easy to cause formation depletion or pressure fluctuation; second, injection-production operations need to be carried out alternately, and must wait for the formation pressure to recover to the balanced state before continuing, which leads to the inability to realize continuous oil production, seriously affecting the production efficiency.

[0003] Therefore, integrating two large-diameter injection-production integrated oil production wells in a single well slot to realize a "single-cylinder double-well" structure not only can effectively save well slot resources, but also can simultaneously control injection-production dynamics and improve recovery efficiency and formation stability.

[0004] Therefore, a large-diameter horizontal injection-production integrated oil production single-cylinder double-well device is proposed to break through the space limitation and realize efficient, continuous and stable offshore oil and gas co-development. SUMMARY

[0005] In view of the above or existing problems in the prior art, the present application is proposed.

[0006] Therefore, the purpose of the present application is to provide a large-diameter horizontal injection-production integrated oil production single-cylinder double-well device.

[0007] To solve the above technical problems, the present application provides the following technical scheme: a large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, comprising a single-cylinder double-well base, and an injection well and a collection well arranged on the single-cylinder double-well base; a horizontal tubing hanger is arranged in the injection well; the horizontal tubing hanger comprises a connecting body, and a first channel and a second channel arranged on the connecting body; the first channel and the second channel are in communication; an injection end is arranged on the injection well, and the injection end and the second channel are in communication.

[0008] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device of the present application, wherein: the injection well comprises a first casing head arranged on the single-cylinder double-well base, and a first tubing cross arranged on the first casing head, and a horizontal Christmas tree is arranged on the first tubing cross; the horizontal tubing hanger is arranged in the first tubing cross.

[0009] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the horizontal Christmas tree comprises a main valve arranged on the first tubing cross and a double valve arranged on the main valve, and the injection end is arranged on the double valve.

[0010] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the first channel and the second channel are arranged vertically, and a right-angle elbow is arranged on the first tubing cross, and the right-angle elbow connects the first tubing cross and the double valve.

[0011] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the first casing head is provided with a first tangent plane, the first tangent plane is arranged on the side of the first casing head close to the production well, and the main valve and the first tangent plane are arranged vertically.

[0012] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the main valve is provided with a first Christmas tree cap, the first tubing cross is provided with a second tangent plane, and the first tangent plane and the second tangent plane are coplanar.

[0013] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the connecting main body is provided with an upper end and a lower end, and the connecting main body is provided with a pipeline hole.

[0014] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the production well comprises a second casing head arranged on the single-cylinder double-well base and a second tubing cross arranged on the second casing head, the second tubing cross is provided with a vertical Christmas tree, the vertical Christmas tree is provided with a choke valve, and the vertical Christmas tree is provided with a second Christmas tree cap and a combination valve.

[0015] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the second casing head is provided with a third tangent plane, and the third tangent plane is arranged on the side of the second casing head close to the injection well.

[0016] As a preferred scheme of the large-diameter horizontal injection-production integrated oil production single-cylinder double-well device, the inner wall diameter of the injection end is greater than the inner wall diameter of the outlet of the choke valve.

[0017] The big-pass horizontal injection and production integrated oil production single-cylinder double-well device has the beneficial effects that the injection well and the collection well are independently operated to perform one injection and one production operation, the reservoir pressure can be kept stable in the process, continuous oil production can be realized, and there is no waiting time, the injection water can immediately fill the reservoir space after the produced oil of the oil production well, there is no time difference of "reservoir depletion", and the reservoir skeleton is always in a pressure supporting state. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a whole structure schematic diagram of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0020] Figure 2 It is a horizontal production Christmas tree structure schematic diagram of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0021] Figure 3 It is an injection well structure schematic diagram of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0022] Figure 4 It is a collection well structure schematic diagram of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0023] Figure 5 It is a connection state schematic diagram of the horizontal tubing hanger and the first tubing cross of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0024] Figure 6 It is a structure schematic diagram of the horizontal tubing hanger of the big-pass horizontal injection and production integrated oil production single-cylinder double-well device.

[0025] In the figure: 1, single-cylinder double-well base; 2, injection well; 21, first casing head; 211, first cutting surface; 22, first tubing cross; 221, right-angle elbow; 222, second cutting surface; 23, horizontal production Christmas tree; 231, injection end; 232, main valve; 233, double valve; 234, first production Christmas tree cap; 24, horizontal tubing hanger; 241, connection main body; 242, first channel; 243, second channel; 244, upper end head; 245, lower end head; 246, pipeline hole; 3, collection well; 31, second casing head; 311, third cutting surface; 32, second tubing cross; 33, vertical production Christmas tree; 34, throttle valve; 35, second production Christmas tree cap; 36, combination valve. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details given herein, that the present application can be practiced with other than the described embodiments, and that the present application can be practiced with different or additional components, elements, acts, or steps. Thus, the present application is not limited to the embodiments described herein but can be practiced with variations within the spirit and scope of the present application.

[0028] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent or alternative to other embodiments.

[0029] Embodiment 1, with reference to Figures 1 to 6 For the first embodiment of the present application, the embodiment provides a large-diameter horizontal injection and production integrated oil production single-cylinder double-well device, which comprises a single-cylinder double-well base 1, and an injection well 2 and a collection well 3 arranged on the single-cylinder double-well base 1; in the embodiment, the single-cylinder double-well base 1 is sealed on the water pipe, and the single-cylinder double-well base 1 has two identical and non-interfering hanger seats hanging in the cavity.

[0030] The injection well 2 is provided with a horizontal tubing hanger 24; wherein the horizontal tubing hanger 24 comprises a connecting body 241, and a first channel 242 and a second channel 243 arranged on the connecting body 241; the first channel 242 and the second channel 243 are in communication; the injection well 2 is provided with an injection end 231, and the injection end 231 and the second channel 243 are in communication.

[0031] In the exploitation process of offshore oilfield, as crude oil is continuously produced, the pressure of the underground oil reservoir will gradually decrease, if the pressure is too low, it will lead to the increase of the flow resistance of crude oil, the increase of the exploitation difficulty, and even the phenomenon of "reservoir depletion" leading to the sharp decline of production. At this time, water is injected into the horizontal tubing hanger 24 through the injection end 231, and the water is injected into the formation, which can effectively maintain or improve the pressure of the oil reservoir, and provide power for the flow of crude oil, so as to alleviate the problem of production decline, and ensure the continuous and stable operation of oil production, and the collection well 3 can keep continuous exploitation, and realize the operation of one injection and one production. Compared with the traditional double-well oil production and double-well water injection, the one injection and one production mode of the present application can greatly improve the efficiency of oil production. When the conventional double-well oil production and double-well water injection are carried out, the oil production time, the water injection time, the oil production amount and the water injection amount need to be strictly controlled to stabilize the pressure of the underground oil reservoir, and there is a certain distance between the oil production well and the water injection well. When a large amount of water is injected at a long distance, the pressure at the water injection position is high, and a certain time is needed for penetration. If the oil production time, the water injection time, the oil production amount and the water injection amount are not accurately grasped, the stability of the formation will decrease, and the phenomenon of "only production and no injection" will occur in the exploitation process, and the pressure of the oil reservoir will continuously decrease with the production of crude oil. If the pressure of the oil reservoir is to be maintained, the matching relationship between the oil production amount and the water injection amount needs to be strictly calculated, and the water injection amount needs to be frequently adjusted through the ground system, and the lag is high. A little deviation will lead to pressure imbalance. If the water injection amount is too high, the crude oil will flow backward, and if the water injection amount is too low, the production will sharply decrease, and the control difficulty is extremely great. For the double-well operation platform which can switch between oil production and water injection functions, the staff needs to wait for a certain time to switch the functions, and the pressure of the formation needs to be restored for a long time. The operation mode of "first injection and then production" in the prior art cannot respond to the pressure change of the formation caused by oil production in real time. The pressure peak of the formation after water injection and the pressure valley of the formation during oil production are quite different, and the stability of the formation is extremely poor.

[0032] The injection well 2 and the collection well 3 of the present application operate independently, and carry out the exploitation operation mode of one production and one injection. During the exploitation process, not only the stability of the oil reservoir pressure can be maintained, but also the continuous oil production can be realized, without the need to wait for additional time. The injected water can immediately fill the space of the oil reservoir after the production of crude oil by the oil production well, there is no time difference of "reservoir depletion", and the formation skeleton is always in a pressure supporting state.

[0033] Specifically, the connecting body 241 is provided with an upper end 244 and a lower end 245, and the connecting body 241 is provided with a pipeline hole 246, and the upper end 244 and the lower end 245 are used for connecting corresponding pipelines respectively, and it should be noted that a downhole safety valve is usually arranged in the riser, and the downhole safety valve is used to cut off the downhole pressure in an emergency state, and the reserved pipeline hole 246 can be connected with the control pipeline of the downhole safety valve to control the downhole safety valve, thereby facilitating use in an emergency.

[0034] It should be noted that the existing collection well 3 is usually provided as follows: the collection well 3 includes a second casing head 31 arranged on the single-cylinder double-well base 1, and a second tubing cross 32 arranged on the second casing head 31, and the second tubing cross 32 is provided with a vertical Christmas tree 33, the vertical Christmas tree 33 is provided with a choke valve 34, and the vertical Christmas tree 33 is provided with a second Christmas tree cap 35 and a combination valve 36.

[0035] Among them, the choke valve 34 is used to control the flow of oil production, and the discharge amount of oil is controlled through the choke valve 34.

[0036] Embodiment 2, refer to Figures 1 to 6 , the second embodiment of the present application, which is different from the previous embodiment, the injection well 2 includes a first casing head 21 arranged on the single-cylinder double-well base 1, and a first tubing cross 22 arranged on the first casing head 21, and the first tubing cross 22 is provided with a horizontal Christmas tree 23; the injection well 2 is different from the conventional collection well 3 in that the vertical Christmas tree 33 is changed to the horizontal Christmas tree 23, wherein the horizontal tubing hanger 24 is arranged in the first tubing cross 22.

[0037] Specifically, the horizontal Christmas tree 23 includes a main valve 232 arranged on the first tubing cross 22, and a double valve 233 arranged on the main valve 232; an injection end 231 is arranged on the double valve 233, and the main valve 232 can be used during maintenance.

[0038] Further, the first channel 242 and the second channel 243 are vertically arranged; the first tubing cross 22 is provided with a right-angle elbow 221, and the right-angle elbow 221 connects the first tubing cross 22 and the double valve 233.

[0039] Refer to Figure 3Water is injected from the injection end 231, and the water injection path can be specifically as follows: water flows into the first channel 242 from the injection end 231 through the main valve 232, and the water injection path can also be specifically as follows: after water is injected from the injection end 231, it is injected into the second channel 243 through the right-angle elbow 221, and then flows into the first channel 242 through the second channel 243. When impurities exist in the injected water and affect the water injection process, or when impurities exist above the horizontal oil pipe hanger 24, water can also be injected through the second channel 243 on the side to avoid blockage, and because water flows in the second channel 243, according to Bernoulli's principle, the pressure is small where the flow rate is large, so the impurities above the first channel 242 will be moved by the flowing water, so that the impurities are gradually injected into the ground together. As the impurities are reduced, the blockage above the first channel 242 will be gradually alleviated and solved, and the subsequent first channel 242 can also maintain good direct water injection effect, thereby ensuring the water injection efficiency.

[0040] Further, the first casing head 21 is provided with a first cut surface 211; the first cut surface 211 is arranged on the side of the first casing head 21 close to the production well 3; and the main valve 232 and the first cut surface 211 are arranged vertically.

[0041] Because the overall radial size of the riser is much smaller than the overall radial size of the large-diameter horizontal injection and production integrated oil production single-cylinder double-well device, and each riser needs to be arranged in an interval, there is a problem that the installation space and distance between the large-diameter horizontal injection and production integrated oil production single-cylinder double-well devices are limited. When the valve rod part of the main valve 232 and the first cut surface 211 are arranged oppositely, the space for the operator to operate the valve rod of the main valve 232 will be significantly reduced, thereby affecting the use of the main valve 232 by the operator. When the main valve 232 and the first cut surface 211 are arranged vertically, the orientation of the valve rod is changed, and there is no obstruction in the movement direction of the valve rod, which can facilitate the normal use of the main valve 232 by the operator and improve the operation space.

[0042] Further, the main valve 232 is provided with a first Christmas tree cap 234; and the first Christmas tree cap 234 and the main valve 232 are connected by bolt fixing.

[0043] Further, the first tubing cross 22 is provided with a second cut surface 222, and the first cut surface 211 and the second cut surface 222 are coplanar.

[0044] Further, the second casing head 31 is provided with a third cut surface 311, and the third cut surface 311 is arranged on the side of the second casing head 31 close to the injection well 2.

[0045] It should be noted that the first cut surface 211 and the third cut surface 311 are arranged in parallel.

[0046] Further, the inner wall diameter of the injection end 231 is greater than the inner wall diameter at the outlet of the throttle valve 34, which can make the efficiency of the injected water greater than the efficiency of oil production.

[0047] Preferably, in the prior art, the double-well oil production and double-well water injection mode is used for work, and based on the modification of the prior art, based on the modification cost, only part of the single-cylinder double-well base 1 needs to be modified, for example, there are several evenly distributed risers in the entire oil production area, and all the risers in the oil production area form a large cluster, based on the uniform division principle, the large cluster is evenly divided into multiple small clusters, and a large-diameter horizontal injection and production integrated oil production single-cylinder double-well device is arranged at the center position of each small cluster, and the conventional equipment of the double-well oil production is normally arranged around the large-diameter horizontal injection and production integrated oil production single-cylinder double-well device, and the injection end 231 of the large-diameter horizontal injection and production integrated oil production single-cylinder double-well device is used for water injection operation, that is, the normal work of at least four conventional double-well oil production devices around can be maintained, and the water injected by the conventional water injection well needs to wait for a long time to be conducted to the oil reservoir around the oil production well, during which the formation around the oil production well is prone to "emptying" due to the excessively low pressure, which is prone to induce formation fracture and further damage the stability of the formation, thereby increasing the difficulty of production, at the same time, if the distance between the two wells is too small, synchronous water injection is prone to cause local high pressure, and the pressure in the middle region of the two wells is superimposed, which is prone to cause formation channeling, and the injected water bypasses the oil layer and is directly produced from the oil production well; if the water is injected in sequence, it will also cause "alternating low pressure", that is, when one well is injected, the other well is stopped, which will cause the pressure of the formation around the stopped well to drop sharply, which also damages the stability of the formation, therefore, the present application adopts the one-injection and one-production mode, which can effectively avoid the above-mentioned problems and abnormal conditions during the conventional double-well oil production and double-well water injection operation, so that the formation pressure around is kept in a relatively balanced state, the formation is protected, and continuous oil production can be realized, thereby greatly improving the production efficiency.

[0048] The remaining structures are the same as those in Embodiment 1.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting, and although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A large-diameter horizontal injection-production integrated oil production single-tube dual-well device, characterized in that: It includes a single-tube double-well base (1), and an injection well (2) and a collection well (3) disposed on the single-tube double-well base (1); The injection well (2) is equipped with a horizontal tubing hanger (24); The horizontal tubing hanger (24) includes a connecting body (241), and a first channel (242) and a second channel (243) provided on the connecting body (241). The first channel (242) and the second channel (243) are connected; The injection well (2) is provided with an injection end (231), and the injection end (231) is connected to the second channel (243); The injection well (2) includes a first casing head (21) provided on the single-tube double-well base (1) and a first tubing cross (22) provided on the first casing head (21), and a horizontal production tree (23) provided on the first tubing cross (22). The horizontal tubing hanger (24) is located inside the first tubing cross (22); The horizontal tree (23) includes a main valve (232) on the first tubing cross (22) and a double valve (233) on the main valve (232). The injection end (231) is located on the double valve (233); The first channel (242) and the second channel (243) are arranged vertically; The first oil pipe tee (22) is provided with a right angle elbow (221), which connects the first oil pipe tee (22) and the double valve (233); The first sleeve head (21) is provided with a first cut surface (211); The first cut surface (211) is located on the side of the first casing head (21) near the collection well (3); The main valve (232) and the first cross-section (211) are arranged perpendicularly; The main valve (232) is equipped with a first oil production tree cap (234); The first oil pipe cross (22) is provided with a second cross surface (222), and the first cross surface (211) and the second cross surface (222) are coplanar.

2. The large-diameter horizontal integrated injection and production single-tube dual-well device as described in claim 1, characterized in that: The connecting body (241) is provided with an upper end (244) and a lower end (245), and the connecting body (241) is provided with a pipeline hole (246).

3. The large-diameter horizontal injection-production integrated oil production single-tube dual-well device as described in claim 2, characterized in that: The well (3) includes a second casing head (31) on the single-tube double-well base (1) and a second tubing cross (32) on the second casing head (31). The second tubing cross (32) is provided with a vertical tree (33), the vertical tree (33) is provided with a throttle valve (34), the vertical tree (33) is provided with a second tree cap (35) and a combination valve (36).

4. The large-diameter horizontal integrated injection and production single-tube dual-well device as described in claim 3, characterized in that: The second casing head (31) is provided with a third cut surface (311), which is located on the side of the second casing head (31) near the injection well (2).

5. The large-diameter horizontal injection-production integrated oil production single-tube dual-well device as described in claim 4, characterized in that: The inner diameter of the injection end (231) is greater than the inner diameter of the outlet of the throttle valve (34).

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