Separate layer production string

Abstract

The present application relates to the technical field of oil exploitation, and more particularly to a layered oil production pipe string, comprising: a measuring and adjusting pipe string, the measuring and adjusting pipe string is provided with at least two packoff sections, each packoff section corresponds to at least one oil layer, a perforating section is arranged above the packoff section, and the measuring and adjusting pipe string is used for conveying oil production related equipment; a casing is sleeved on the measuring and adjusting pipe string, and an annulus is formed between the casing and the measuring and adjusting pipe string; a pumping assembly is located in the annulus and above the perforating section, and the pumping assembly is used for pumping oil; and a switch piece is arranged on the packoff section and located at the annulus corresponding to the packoff section. In this way, the pipe string structure is simplified, the measuring and adjusting pipe string can be used to convey the oil production related equipment, and a bypass pipe does not need to be additionally arranged, so that the outer diameter of the casing and the overall radial size of the layered oil production pipe string are reduced, the pipe string arrangement cost is reduced, the construction difficulty is reduced, the layered oil production pipe string is suitable for the exploitation of various oil fields, and the applicability is improved.

Description

Technical Field

[0001] This invention relates to the technical field of oil extraction, and more specifically, to a stratified oil production tubing string. Background Technology

[0002] Currently, all major oilfields face the same problem during the extraction process: long well sections, multiple oil layers, and strong interlayer heterogeneity. This leads to increasingly serious problems such as interlayer interference, edge water inrush, and sand production, requiring layer adjustment, water plugging operations, and sand production solutions, resulting in extremely high operating costs.

[0003] Currently, due to the space constraints required for the oil production tubing structure, the casing size is usually larger, which increases costs. In addition, the larger casing size also increases the difficulty of construction. For oil fields with low production, using conventional casing would result in resource waste and poor economic efficiency.

[0004] Therefore, it is necessary to propose a stratified oil production tubing to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] In view of this, a stratified oil production tubing string is proposed according to an embodiment of this application, comprising:

[0008] The test and control string is provided with at least two isolation sections, each of which corresponds to at least one oil layer. A perforated section is provided above the isolation section. The test and control string is used to transport oil production related equipment.

[0009] A sleeve is fitted onto the aforementioned measuring and adjusting tubing, forming an annulus between the sleeve and the aforementioned measuring and adjusting tubing.

[0010] A pumping assembly is located within the annulus and above the perforated section, and the pumping assembly is used to pump oil.

[0011] The switch is located in the aforementioned enclosure section, at the aforementioned annular space corresponding to the aforementioned enclosure section.

[0012] In one feasible implementation, the pumping assembly includes:

[0013] An electric pump, which is provided with a delivery hole, is connected to the outer wall of the measuring and adjusting column and is located above the drilling section.

[0014] The delivery pipe is connected to the output end of the aforementioned electric pump;

[0015] The cable is connected to the electric pump and fixed to the outer wall of the delivery pipe;

[0016] The first packer is disposed in the annulus and located between the delivery pipe and the sleeve.

[0017] In one feasible implementation, the electric pump, the delivery pipe, the cable, and the first packer are an integrated structure.

[0018] In one feasible implementation, the outer diameter of the first packer is 152 mm to 154 mm;

[0019] The outer diameter of the above-mentioned electric pump is less than or equal to 89 mm.

[0020] In one feasible implementation, the minimum outer diameter of the aforementioned measuring and adjusting tubing is 60 mm to 62 mm.

[0021] The minimum inner diameter of the aforementioned measuring and adjusting tubing is 50mm to 52mm.

[0022] In one feasible implementation, the aforementioned stratified oil production tubing string further includes:

[0023] A plug is installed at the bottom of the aforementioned measuring and adjusting tubing.

[0024] In one feasible implementation, the aforementioned stratified oil production tubing string further includes:

[0025] The second packer is disposed at both ends of the aforementioned packer section;

[0026] The bottommost of the aforementioned packer section has a second packer at its top.

[0027] In one feasible implementation, the aforementioned stratified oil production tubing string further includes:

[0028] Sandproof components are installed at the annular space corresponding to the aforementioned sealing section and are fitted onto the aforementioned switch components.

[0029] In one feasible implementation, the sand-proof component is a sand-proof screen pipe, which is connected to the sealing section and disposed in the annulus corresponding to the sealing section, for transporting the oil in the annulus to the sealing section and screening out sand and gravel.

[0030] The aforementioned switch is a sliding sleeve, which is connected to the aforementioned sand-proof screen pipe. When the aforementioned sliding sleeve is open, the aforementioned sand-proof screen pipe supplies oil to the aforementioned sealing section.

[0031] In one feasible implementation, the aforementioned sand-proof screen pipe and the aforementioned sliding sleeve are an integrated structure.

[0032] Compared to existing technologies, the present invention offers at least the following advantages: The layered oil production tubing provided in this application includes a test and adjustment tubing, casing, pumping assembly, and switching element. The test and adjustment tubing can be used to transport oil production-related equipment, detect oil layer and tubing status parameters, and transport oil. The test and adjustment tubing has at least two isolation sections, each corresponding to at least one oil layer, and a perforated section is located above the uppermost isolation section. The casing is fitted onto the test and adjustment tubing, forming an annulus between the casing and the tubing. This annulus can be used to transport oil and serves as a storage space. The pumping assembly is located within the annulus and above the perforated section, pumping the oil transported to the annulus through the perforated section to complete the oil production operation. The switching element is located at each isolation section and at the corresponding annulus to control whether oil in the annulus flows into the isolation section. Specifically, when the switching element is open, oil in the annulus flows into the isolation section. With the switch closed, oil in the annulus stops flowing into the packer section, thus achieving stratified oil production. This configuration simplifies the tubing structure, allowing the use of a control tubing string to transport oil production equipment without the need for additional bypass pipes. This reduces the outer diameter of the casing and the overall radial dimensions of the stratified oil production tubing string, lowering installation costs and simplifying construction. Furthermore, it is suitable for various oilfield applications, enhancing its applicability.

[0033] The stratified oil production tubing of the present invention, and other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part from the understanding of those skilled in the art through study and practice of the invention. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of a layered oil production tubing provided in an embodiment of this application.

[0036] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0037] 110 Measurement and adjustment string, 111 Packer section, 112 Drilling section, 120 Sleeve, 130 Pumping assembly, 131 Electric pump, 132 Delivery hole, 133 Delivery pipe, 134 Cable, 135 First packer, 136 Check valve, 140 Sliding sleeve, 150 Plug, 160 Second packer, 170 Sand screen pipe, 200 Oil layer. Detailed Implementation

[0038] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0039] like Figure 1 As shown in the embodiment of this application, a test and adjustment string 110 is provided. The test and adjustment string 110 is provided with at least two oil layer 200 segments 111, each of the oil layer 200 segments 111 corresponding to at least one oil layer 200. A perforated section 112 is provided above the oil layer 200 segment 111. The test and adjustment string 110 is used to transport oil production related equipment. A casing 120 is sleeved on the test and adjustment string 110, and an annulus is formed between the casing 120 and the test and adjustment string 110. A pumping assembly 130 is located in the annulus and above the perforated section 112. The pumping assembly 130 is used to pump oil. A switch is provided on the oil layer 200 segment 111 and located at the annulus corresponding to the oil layer 200 segment 111.

[0040] It is understood that the layered oil production tubing provided in this application embodiment includes a test and adjustment tubing 110, a casing 120, a pumping assembly 130, and a switching element. The test and adjustment tubing 110 can be used to transport oil production-related equipment, detect the state parameters of the oil layer 200 and the oil production tubing, and transport oil. The test and adjustment tubing 110 has at least two oil layer 200 segments 111, and each oil layer 200 segment 111 corresponds to at least one oil layer 200. A perforated section 112 is provided above the uppermost oil layer 200 segment 111. The casing 120 is fitted onto the test and adjustment tubing 110, forming an annulus between the casing 120 and the test and adjustment tubing 110. The annulus can be used to transport oil and serve as a storage space. The pumping assembly 130 is disposed within the annulus and above the perforated section 112, and can pump the oil transported to the annulus through the perforated section 112 to complete the oil production operation. The switching element is installed at each of the 200 segments 111 of the oil layer, specifically at the corresponding annulus of the 200 segment 111, to control whether oil in the annulus flows into the 200 segment 111. Specifically, when the switching element is open, oil in the annulus flows into the 200 segment 111. When the switching element is closed, oil in the annulus stops flowing into the 200 segment 111. This achieves stratified oil production. This configuration simplifies the tubing structure; the measuring and adjusting tubing string 110 can be used to transport oil production equipment without the need for additional bypass pipes. This reduces the outer diameter of the casing 120 and the overall radial dimension of the stratified oil production tubing string, decreasing tubing layout costs and construction difficulty. Furthermore, it is suitable for various oilfield applications, improving applicability.

[0041] Understandably, existing stratified oil production tubing requires additional bypass pipes to transport oil production equipment. Setting up bypass pipes necessitates the installation of Y-joints and other related equipment, resulting in significant space requirements and necessitating larger casing 120 sizes, typically 9-5 / 8 inches. This application, however, simplifies the structure by placing the pumping assembly 130 entirely within the annulus. Oil is transported from the test and adjustment tubing 110 to the pumping assembly 130 through the through-hole of the perforated section 112 of the test and adjustment tubing 110, thereby pumping the oil out of the annulus and completing oil production. This eliminates the need for Y-joints and related equipment, while also increasing the inner diameter of the test and adjustment tubing 110 to transport oil production equipment, thus reducing the outer diameter of the casing 120, allowing for the use of 7-inch casing 120.

[0042] In some examples, such as Figure 1As shown, the pumping assembly 130 includes: an electric pump 131, which has a delivery hole 132 and is connected to the outer wall of the measuring and adjusting column 110 and located above the perforated section 112; a delivery pipe 133 connected to the output end of the electric pump 131; a cable 134 connected to the electric pump 131 and fixed to the outer wall of the cable 134; and a first packer 135 disposed in the annulus and located between the delivery pipe 133 and the sleeve 120.

[0043] Understandably, the pumping assembly 130 includes an electric pump 131, a delivery pipe 133, a cable 134, and a first packer 135. Specifically, the electric pump 131 is fixedly connected to the outer wall of the test and adjustment string 110 to ensure its continuous and stable operation. The electric pump 131 has a delivery port 132 facing the annulus, and the delivery pipe 133 is connected to the output end of the electric pump 131. Oil flowing into the annulus through the through-hole of the perforated section 112 of the test and adjustment string 110 is pumped into the delivery pipe 133 by the electric pump 131, thus delivering oil to the outside and completing the oil production operation. The cable 134 is connected to the electric pump 131 to supply operating current to the pump 131, and the cable is fixed to the outer wall of the delivery pipe 133 to ensure a continuous and stable current supply, improving stability. The first packer 135 is located within the annulus, between the delivery pipe 133 and the casing 120, to seal off this area. The first packer 135 seals the area above the electric pump 131 in the annulus, preventing the oil in the annulus from flowing back downwards, thus acting as a barrier and ensuring stable oil delivery. The electric pump 131 can be directly fixed to the outer wall of the measuring and adjusting tubing 110, eliminating the need for a Y-connector to the electric pump 131. This makes efficient use of the annulus space and helps reduce the outer diameter of the sleeve 120.

[0044] For example, the first packer 135 may be a cable packer to allow cable passage and ensure normal current transmission.

[0045] For example, a one-way valve 136 may be installed in the delivery pipe 133 to allow the oil to flow in one direction in the delivery direction, thereby preventing oil backflow and improving oil production stability.

[0046] In some examples, the electric pump 131, the delivery pipe 133, the cable 134, and the first packer 135 are integrated into one unit.

[0047] It is understandable that the electric pump 131, delivery pipe 133, cable 134, and first packer 135 can be configured as an integrated structure. Reducing the number of delivery devices, improving assembly efficiency, and reducing connection structures helps to shrink the overall volume of the pumping assembly 130, allowing for a larger inner diameter of the measuring and adjusting tubing string 110 and a smaller outer diameter of the casing 120. This reduces the outer diameter of the casing 120 and the overall radial dimension of the stratified oil production tubing string, reducing tubing string deployment costs, lowering construction difficulty, and making it suitable for various oilfield applications, thus improving applicability. For example, the pumping assembly 130 can be fixed to the measuring and adjusting tubing string 110 via a threaded connection.

[0048] In some examples, the outer diameter of the first packer 135 is 152 mm to 154 mm; the outer diameter of the electric pump 131 is less than or equal to 89 mm. The inner diameter of the 7-inch casing 120 is less than or equal to 159.42 mm. This arrangement of the dimensions of the first packer 135 and the electric pump 131 meets the usage requirements of the 7-inch casing 120, reduces tubing installation costs, lowers construction difficulty, and is suitable for various oilfield applications, thus improving applicability. For example, the pumping assembly 130 can be fixed to the test and adjustment tubing 110 via a threaded connection.

[0049] In some examples, the outer diameter of the aforementioned measuring and adjusting column 110 at the aforementioned electric pump 131 is set to be the smallest, with the minimum outer diameter of the aforementioned measuring and adjusting column 110 being 60mm to 62mm; the minimum inner diameter of the aforementioned measuring and adjusting column 110 is 50mm to 52mm.

[0050] Understandably, the outer diameter of the test and adjustment string 110 can be adjusted according to its installation location. Since the electric pump 131 is fixed to the outer wall of the test and adjustment string 110, in order to meet the installation space requirements of the electric pump 131 in the annulus and avoid interference, the outer diameter of the test and adjustment string 110 corresponding to the electric pump 131 is minimized, with a minimum outer diameter of 60mm to 62mm. Simultaneously, to ensure smooth transport of oil production equipment, the minimum inner diameter of the test and adjustment string 110 is set to 50mm to 52mm.

[0051] In some examples, such as Figure 1 As shown, the aforementioned stratified oil production tubing also includes a plug 150, which is installed at the bottom of the aforementioned measurement and adjustment tubing 110. This is to seal the bottom of the measurement and adjustment tubing 110 and prevent sand and gravel from entering the measurement and adjustment tubing 110 from the bottom.

[0052] In some examples, such as Figure 1 As shown, the above-mentioned stratified oil production tubing also includes: a second packer 160, which is respectively disposed at both ends of the above-mentioned oil layer 200 segment 111; wherein, the top of the bottommost oil layer 200 segment 111 is provided with one of the above-mentioned second packers 160.

[0053] Understandably, the stratified oil production tubing is also equipped with a second packer 160, which isolates the 200 segments 111 of the oil layer. Specifically, the bottom of the lowest segment 111 of the oil layer is sealed with a plug 150, and the top of the lowest segment 111 of the oil layer is sealed with a second packer 160. Second packers 160 are installed at both the top and bottom of the remaining segments 111 of the oil layer, thus isolating each segment 111. Since each segment 111 of the oil layer is equipped with a switching element, stratified extraction is carried out by controlling the opening or closing of the switching element.

[0054] In some examples, the aforementioned stratified oil production tubing also includes: a sand-proof component, disposed at the annulus corresponding to the oil layer 200 segment 111, and fitted onto the aforementioned switch component.

[0055] Understandably, the stratified oil production tubing is also equipped with sand guards. Specifically, these sand guards are installed in the annulus corresponding to section 111 of oil layer 200 to prevent sand and gravel from entering section 111 of oil layer 200 and affecting oil production. This ensures long-term stable oil production operations and improves reliability. Simultaneously, the sand guards are located outside the switching element and can be sleeved onto it. This ensures that when the switching element is opened, the oil in oil layer 200 first passes through the sand guards, preventing sand and gravel from entering section 111 of oil layer 200, further improving reliability.

[0056] In some examples, the aforementioned sand-proof component is a sand-proof screen tube 170, which is connected to the aforementioned oil layer 200 segment 111 and disposed in the annulus corresponding to the aforementioned oil layer 200 segment 111. It is used to transport the oil in the aforementioned annulus to the aforementioned oil layer 200 segment 111 and screen out sand and gravel. The aforementioned switch component is a sliding sleeve 140, which is connected to the aforementioned sand-proof screen tube 170. When the aforementioned sliding sleeve 140 is open, the aforementioned sand-proof screen tube 170 supplies oil to the aforementioned oil layer 200 segment 111.

[0057] It is understandable that the sand control component can be a sand control screen pipe 170, and the switching component can be a sliding sleeve 140. Specifically, the sand control screen pipe 170 is sleeved on the outside of the sliding sleeve 140 and located in the annulus corresponding to the oil layer 200 segment 111. This screens out the gravel that is about to enter the oil layer 200 segment 111. When the sliding sleeve 140 is open, the oil in the annulus enters the oil layer 200 segment 111 after the sand and gravel are screened out by the sand control screen pipe 170. When passing through the perforated section 112, it enters the annulus where the electric pump 131 is located through the through hole, and is pumped from the delivery hole 132 of the electric pump 131 to the delivery pipe 133 to complete the oil production operation. When the sliding sleeve 140 is closed, the oil in the annulus cannot enter the oil layer 200 segment 111. The sliding sleeves 140 corresponding to the other oil layers 200 segment 111 can be opened for stratified oil production.

[0058] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stratified oil production tubing string, characterized in that, include: The test and control string is provided with at least two isolation sections, each isolation section corresponding to at least one oil layer, and a perforated section is provided above the isolation section. The test and control string is used to transport oil production related equipment. A sleeve is fitted onto the measuring and adjusting tubing, and an annular space is formed between the sleeve and the measuring and adjusting tubing; A pumping assembly is located within the annulus and above the perforated section; the pumping assembly is used to pump oil. A switching element is disposed in the enclosure section and located at the annulus corresponding to the enclosure section; The pumping assembly includes: an electric pump directly fixed to the outer wall of the measuring and adjusting column without the need for a Y-connector; a delivery port on the side of the electric pump facing the annulus; the electric pump connected to the outer wall of the measuring and adjusting column and located above the perforated section; a delivery pipe connected to the output end of the electric pump; a cable connected to the electric pump and fixed to the outer wall of the delivery pipe; and a first packer disposed in the annulus, located between the delivery pipe and the sleeve. The pumping assembly is integrally disposed within the annulus. Oil is transported from the test and adjustment string to the pumping assembly through the through-hole of the perforated section of the test and adjustment string, thereby pumping the oil out of the annulus to complete oil production. This eliminates the need for Y-joints and related equipment. At the same time, the inner diameter of the test and adjustment string can be increased, allowing the test and adjustment string to transport oil production-related equipment, thereby reducing the outer diameter of the casing.

2. The stratified oil production tubing string according to claim 1, characterized in that, The electric pump, the delivery pipe, the cable, and the first packer are an integrated structure.

3. The stratified oil production tubing string according to claim 1, characterized in that, The outer diameter of the first packer is 152 mm to 154 mm; The outer diameter of the electric pump is less than or equal to 89 mm.

4. The stratified oil production tubing string according to claim 1, characterized in that, The outer diameter of the measuring and adjusting tubing is set at the electric pump, with the minimum outer diameter being 60mm to 62mm. The minimum inner diameter of the measuring and adjusting tubing is 50mm to 52mm.

5. The stratified oil production tubing string according to claim 1, characterized in that, Also includes: A plug is installed at the bottom end of the measuring and adjusting column.

6. The stratified oil production tubing string according to claim 1, characterized in that, Also includes: The second packer is disposed at both ends of the packer section; The bottommost sealing section has a second packer at its top.

7. The stratified oil production tubing string according to claim 1, characterized in that, Also includes: A sand-proof component is installed at the annular space corresponding to the sealing section and sleeved on the switch component.

8. The stratified oil production tubing string according to claim 7, characterized in that, The sand-proof component is a sand-proof screen tube, which is connected to the sealing section and is set in the annulus corresponding to the sealing section. It is used to transport the oil in the annulus to the sealing section and screen out sand and gravel. The switching element is a sliding sleeve, which is connected to the sand-proof screen pipe. When the sliding sleeve is open, the sand-proof screen pipe supplies oil to the sealing section.

9. The stratified oil production tubing string according to claim 8, characterized in that, The sand-proof screen and the sliding sleeve are an integrated structure.

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