CN212406612U - Sandstone geothermal well same-diameter well body structure - Google Patents
Sandstone geothermal well same-diameter well body structure Download PDFInfo
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- CN212406612U CN212406612U CN202021822881.2U CN202021822881U CN212406612U CN 212406612 U CN212406612 U CN 212406612U CN 202021822881 U CN202021822881 U CN 202021822881U CN 212406612 U CN212406612 U CN 212406612U
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- female joint
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- surface sleeve
- reducing male
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Abstract
The utility model discloses a sandstone geothermal well is with footpath well bore structure belongs to geothermal well technical field, include: the reducing male-female joint, an upper surface sleeve arranged at the upper end of the reducing male-female joint and a lower surface sleeve arranged at the lower end of the reducing male-female joint; the upper end to the lower end of the reducing male-female joint are divided into: the bearing section is arranged below the sealing section; the sealing section is coaxially connected with the upper surface sleeve, and the reducing section is coaxially connected with the lower surface sleeve; the upper surface sleeve is connected with the reducing male-female joint through a screw thread, and the lower surface sleeve is fixedly connected with the reducing male-female joint through a coupling; and V-shaped grooves are formed in the outer walls of the contact positions of the reducing male and female connectors and the lower surface sleeve. According to the scheme, the structure of the lower end part of the reducing male-female joint is changed, so that the defect that a cement plug at the lower part of a choke cannot be thoroughly removed due to the same-diameter well structure is overcome, and the formation of a tubular cement block of cement at the lower end of the cement plug is reduced.
Description
Technical Field
The utility model relates to a geothermal well technical field, concretely relates to sandstone geothermal well is with footpath well bore structure.
Background
In sandstone geothermal well development, the original open-hole structure uses the surface casing (external diameter) with the same specification
Steel grade J55, wall thickness 9.65mm, buttress button); the two-way pipe is connected from the original sleeve penetrating coincidence to the hanger coincidence suspension connection, and the use from the common hanger to the full-sealing hanger is continuously explored and perfected, so that the aim of achieving the high quality and high efficiency of the sandstone geothermal well body structure and the continuous and stable productivity is achieved.
The hangers structurally require a prefabricated hanging frustum to determine a hanging position, and realize hanging and sealing at the position; in practical application, the rigidity reducing of the inner hole formed by the frustum is found on site, so that the cement plug formed after the first-opening cementing can form a choke at the reducing part of the male-female joint of the hanger and can enter the hanger before the second-opening cementing
When the drill bit is used for cleaning cement plug, it can only ensure that the cement plug is cleaned thoroughly above the choke, and the drill bit can only ensure that the cement plug is cleaned thoroughly below the choke due to the fact that the aperture of the choke is smaller
The drill bit cannot pass through, and thus cannot be thoroughly cleaned. The diameter of the hole is reduced below the choke
The drill bit cannot pass through, and thus cannot be thoroughly cleaned. Two-opening time two-opening drill bit outer diameter
Diameter of inner hole of surface layer sleeve
The difference is large, the thickness of the tubular cement residue formed by the circular seam reaches 39.55mm, and the tubular cement residue cannot be thoroughly removed; in the process of second-cut drilling, due to vibration and impact of the drilling tool, the residual cement falls into a well hole in a block shape at random, and causes the phenomenon of block falling and blocking of the drilling tool, thereby influencing stable drilling and even causing hard blocking accidents.
Disclosure of Invention
The utility model provides an above-mentioned problem, a sandstone geothermal well is with footpath shaft structure is provided.
The utility model adopts the technical proposal that: a sandstone geothermal well same-diameter well bore structure, comprising: the reducing male-female joint, an upper surface sleeve arranged at the upper end of the reducing male-female joint and a lower surface sleeve arranged at the lower end of the reducing male-female joint;
the upper end to the lower end of the reducing male-female joint are divided into: the bearing section is arranged below the sealing section;
the sealing section is coaxially connected with the upper surface sleeve, and the reducing section is coaxially connected with the lower surface sleeve.
Furthermore, the upper surface sleeve is connected with the reducing male-female joint through a screw thread, and the lower surface sleeve is fixedly connected with the reducing male-female joint through a coupling.
Furthermore, a V-shaped groove is formed in the outer wall of the contact position of the reducing male-female joint and the lower surface sleeve;
wherein, the coupling joint is in V type inslot, and the contact surface of coupling and V type groove sets up to V type inclined plane with V type groove assorted.
Furthermore, the sealing section is a part between the upper end and the lower end of the reducing male-female joint, the inner diameter of which is not changed;
the bearing section is a part with an inclination on the inner wall of the reducing male-female joint;
the reducing section is a part between the lower end of the bearing part and the lower end of the reducing male-female joint.
Furthermore, the outer wall structure from the bearing section to the reducing section is of a ladder type structure.
Furthermore, the outer wall of the bearing section to the reducer section is provided with at least one group of steps.
Furthermore, the outer walls of the upper surface sleeve, the reducing male-female joint and the lower surface sleeve are hermetically connected with the well wall through cement.
The utility model has the advantages that:
through, the lower part of the reducing male-female joint is structurally changed, the defect that a choke lower cement plug cannot be thoroughly removed due to the same-diameter well structure is overcome, namely, the formation of cement on a tubular cement block at the lower end of the cement plug is reduced, so that a drill bit can be guaranteed to smoothly trip into the well when the drill bit is opened twice, the cement plug under the choke can be thoroughly removed when the drill bit is opened twice, and the hard block caused by the fact that the residual cement block drops in the drilling process is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
Fig. 1 is a schematic front structural view of an embodiment of the present invention;
fig. 2 is a schematic view of a conventional geothermal well structure.
Reference numerals:
1 is reducing male-female joint, 101 is sealed section, 102 is the bearing section, 103 is the reducing section, 2 is last cover, 3 is lower cover, 4 is the coupling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 to 2, as shown in fig. 1 to 2, a sandstone geothermal well bore structure of the same diameter comprises: the reducing male-female joint comprises a reducing male-female joint 1, an upper surface sleeve 2 arranged at the upper end of the reducing male-female joint 1 and a lower surface sleeve 3 arranged at the lower end of the reducing male-female joint 1;
the upper end to the lower end of the reducing male-female joint 1 are divided into: the sealing section 101, the bearing section 102 arranged below the sealing section 101, and the reducing section 103 arranged below the bearing section 102;
the sealing section 101 is coaxially connected with the upper surface sleeve 2, and the reducing section 103 is coaxially connected with the lower surface sleeve 3.
It should be noted that, in order to remove cement residues in a well structure and ensure the normal use of the hanger, the only feasible method is to make the inner hole of the casing below the first-opening male-female joint of the hanger to be reduced as much as possible on the premise of ensuring that the second-opening drill bit can smoothly pass through, and the inner hole is matched with the specification of the drill bit, and the most feasible scheme for achieving the purpose is to realize diameter reduction through the hanger, so that the first-opening cementing cement has no residues or is reduced.
In addition, the casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire well after the drilling process and completion. Each well uses several layers of casing depending on the drilling depth and geological conditions. The casing is set and then cemented by cement, which is different from oil pipe and drill rod, can not be reused and belongs to disposable consumption material. Therefore, the consumption of the casing accounts for 70% or more of the total oil country tubular goods. The casing pipe can be divided into a guide pipe, a surface casing pipe, a technical casing pipe and an oil layer casing pipe according to the use condition.
The utility model discloses an in the embodiment, go up the table cover 2 and be connected through the screw thread with reducing male and female joint 1, lower table cover 3 passes through coupling fixed connection with reducing male and female joint 1.
In one embodiment of the utility model, a V-shaped groove is arranged on the outer wall of the contact surface of the reducing male-female joint 1 and the lower surface sleeve 2;
wherein, coupling 4 joint is in V type inslot, and coupling 4 and the contact surface in V type groove set up to be with V type groove assorted V type inclined plane.
It should be noted that the arrangement of the V-shaped groove and the V-shaped inclined surface is increased, and the friction force between the coupling 4 and the V-shaped groove makes the coupling 4 not easy to fall off from the outer wall, so that the coupling 4 is favorable for connecting the lower gauge pipe 2 with the reducing male and female joint 1.
In an embodiment of the present invention, the sealing section 101 is a portion between the upper end and the lower end of the reducing male-female joint 1 where the inner diameter is unchanged;
the bearing section 102 is a part with inclination on the inner wall of the reducing male-female joint 1;
the reducing section 103 is a part between the lower end of the bearing section 102 and the lower end of the reducing male-female joint 1.
In an embodiment of the present invention, the outer wall structure of the bearing section 102 to the reducing section 103 is a stepped structure.
It should be noted that, by setting the outer walls of the bearing section 102 to the reducer section 103 to be a stepped structure, the friction force of cement on the pipe sleeve is increased in the process of cementing, thereby facilitating the cementing process.
In an embodiment of the present invention, the step of the outer wall from the bearing section 102 to the reducing section 103 is at least a set.
The utility model discloses an in the embodiment, go up the outer wall of table cover, reducing male and female joint and lower table cover and all carry out sealing connection through cement and the wall of a well.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. The utility model provides a sandstone geothermal well with footpath shaft structure which characterized in that includes: the reducing male-female joint, an upper surface sleeve arranged at the upper end of the reducing male-female joint and a lower surface sleeve arranged at the lower end of the reducing male-female joint;
the upper end to the lower end of the reducing male-female joint are divided into: the bearing section is arranged below the sealing section;
the sealing section is coaxially connected with the upper surface sleeve, and the reducing section is coaxially connected with the lower surface sleeve.
2. The sandstone geothermal well co-diameter well bore structure of claim 1, wherein the upper surface sleeve is connected with the reducing male-female joint through a screw thread, and the lower surface sleeve is fixedly connected with the reducing male-female joint through a coupling.
3. The sandstone geothermal well same-diameter well body structure of claim 2, wherein a V-shaped groove is formed in the outer wall of the contact position of the reducing male and female joint and the lower surface sleeve;
wherein, the coupling joint is in V type inslot, and the contact surface of coupling and V type groove sets up to V type inclined plane with V type groove assorted.
4. The sandstone geothermal well bore structure of claim 3, wherein the sealing section is a part between the upper end and the lower end of the reducing male-female joint, the inner diameter of which is unchanged;
the bearing section is a part with an inclination on the inner wall of the reducing male-female joint;
the reducing section is a part between the lower end of the bearing part and the lower end of the reducing male-female joint.
5. The sandstone geothermal well same-diameter well bore structure of claim 4, wherein the outer wall structure from the bearing section to the reducing section is in a ladder-shaped structure.
6. The sandstone geothermal well bore structure of claim 5, wherein the outer wall of the bearing section to the reducer section is provided with at least one group of steps.
7. The sandstone geothermal well same-diameter well bore structure of claim 1, wherein the outer walls of the upper surface sleeve, the reducing male-female joint and the lower surface sleeve are hermetically connected with a well wall through cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021822881.2U CN212406612U (en) | 2020-08-27 | 2020-08-27 | Sandstone geothermal well same-diameter well body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021822881.2U CN212406612U (en) | 2020-08-27 | 2020-08-27 | Sandstone geothermal well same-diameter well body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212406612U true CN212406612U (en) | 2021-01-26 |
Family
ID=74372001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021822881.2U Active CN212406612U (en) | 2020-08-27 | 2020-08-27 | Sandstone geothermal well same-diameter well body structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212406612U (en) |
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2020
- 2020-08-27 CN CN202021822881.2U patent/CN212406612U/en active Active
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