A well logging and blowout prevention head for oil field water injection well

Abstract

The invention relates to the technical field of oil production, and specifically discloses a well logging blowout preventer for a water injection well in an oil field, comprising a main body, a first groove being provided on the bottom surface of the main body, a guide sleeve being detachably connected in the first groove, a second groove being provided on the top surface of the main body, a sealing body being detachably connected in the second groove, a first dovetail groove being provided on the bottom end of the sealing body, a third groove being provided on the top end of the sealing body, a nut being threadedly connected in the third groove, a second dovetail groove being provided on the bottom end of the nut, an upper sealing component and a lower sealing component being detachably connected in the second dovetail groove and the first dovetail groove, respectively, tapered holes being provided on the bottom surfaces of the second groove and the third groove, the upper sealing component and the lower sealing component having the same structure, both comprising a sealing head formed by splicing a plurality of sealing blocks and being adaptable to the tapered hole, and a sealing sleeve clamped with the sealing head, a locking sleeve being provided on the outer side surface of the sealing sleeve, and a retaining spring being provided on the locking sleeve for clamping the sealing sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of oil exploitation, and in particular discloses a well logging and blowout prevention head for a water injection well in an oil field. Background Art

[0002] In recent years, with the rapid development of my country's economy, people's daily production and life are inseparable from energy, especially petroleum energy. How to vigorously exploit petroleum energy while ensuring the balance of the ecological environment has become the main research issue of my country's oil companies.

[0003] As the most important component in the oil production process, oil well logging equipment plays a very important role in it. Therefore, only by continuously developing new oil well logging equipment can we improve the quality and level of my country's oil production work.

[0004] During oil well logging operations, overflow prevention and control of water injection wells is very important. As my country's requirements for environmental protection become increasingly stringent, new requirements for overflow prevention and control of water injection wells have also been put forward.

[0005] At present, the anti-overflow device structure commonly used in oil fields mostly adopts a single seal, and the pre-tightening force of the seal in the sealing direction is determined by the threaded pair. The seal of the anti-overflow device is prone to excessive wear, which affects the logging work. Therefore, in view of this, the inventor provides an oilfield water injection well logging anti-blowout head to solve the above problem. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the sealing element of the traditional anti-overflow device is prone to excessive wear and tear, thus affecting the well logging work.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a well logging blowout preventer for a water injection well in an oil field, comprising a main body, a first groove is provided on the bottom surface of the main body, a guide sleeve is detachably connected in the first groove, a second groove is provided on the top surface of the main body, a sealing body is detachably connected in the second groove, a first dovetail groove is provided at the bottom end of the sealing body, a third groove is provided at the top end of the sealing body, a nut is threadedly connected in the third groove, a second dovetail groove is provided at the bottom end of the nut, an upper sealing assembly and a lower sealing assembly are detachably connected in the second dovetail groove and the first dovetail groove, respectively, and a tapered hole is provided on the bottom surfaces of the second groove and the third groove;

[0008] The upper sealing assembly and the lower sealing assembly have the same structure, both of which include a sealing head formed by splicing a plurality of sealing blocks and adapted to the tapered hole, and a sealing sleeve clamped to the sealing head, a locking sleeve is provided on the outer side of the sealing sleeve, and a retaining spring is provided on the locking sleeve to clamp the sealing sleeve, and a clearance fit is provided between the tapered hole and the sealing head;

[0009] The nut, the sealing body, the main body, the guide sleeve, the upper sealing component and the lower sealing component are all provided with mutually communicated through holes for the passage of the cable.

[0010] The principles and effects of this basic solution are:

[0011] 1. The present invention is provided with an upper sealing assembly and a lower sealing assembly, and adopts a double sealing assembly structure. When the lower sealing assembly fails, the upper sealing assembly can replace the lower sealing assembly to continue working, and when the lower sealing assembly works normally, the upper sealing assembly is not in a working state, thereby reducing the wear of the upper sealing assembly.

[0012] 2. The present invention is provided with a tapered hole and a sealing head that can be matched with the tapered hole. When the seal is worn, its taper will not change. The tapered sealing head can actively compensate for it to avoid wear of the sealing component and affect the normal logging work.

[0013] 3. In the present invention, all parts are connected or snap-fitted in a detachable manner, and the preload force of the seal is related to the connection structure and has nothing to do with the pressure of the water injection well, thereby reducing the wear of the seal assembly.

[0014] Compared with the prior art, the present invention can effectively reduce the wear of the sealing assembly by providing an upper sealing assembly, a lower sealing assembly and a nut, thereby solving the problem that the sealing parts of the traditional anti-overflow device are prone to excessive wear and affect the logging work. The present invention has a compact structure, is easy to install, and is suitable for popularization and application.

[0015] Furthermore, the sealing head is formed by splicing two sealing blocks with the same appearance. The sealing head formed by splicing two identical sealing heads is more convenient to install.

[0016] Furthermore, the sealing sleeve comprises an inner sleeve and an outer sleeve respectively clamped on the top and side of the sealing head, and the inner sleeve and the outer sleeve fit each other. The sealing sleeve is arranged as an inner sleeve and an outer sleeve that fit each other, which can improve the sealing effect of the upper sealing component and the lower sealing component.

[0017] Furthermore, the threaded connection between the nut and the third groove is a trapezoidal thread, which has a stronger load-bearing capacity.

[0018] Furthermore, the guide sleeve is connected to the first groove via a standard thread, and the sealing body is connected to the second groove via a standard thread. The standard thread is convenient for disassembly and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of a well logging blowout preventer for an oil field water injection well according to an embodiment of the present invention;

[0020] Figure 2 The present invention is a cross-sectional view of a sealing component of a well logging blowout preventer of an oilfield water injection well according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following is a further detailed description through specific implementation methods:

[0022] The reference numerals in the drawings of the specification include: nut 1, upper sealing assembly 2, sealing body 3, main body 4, lower sealing assembly 5, guide sleeve 6, inner sleeve 7, outer sleeve 8, locking sleeve 9, retaining ring 10, sealing block 11.

[0023] A well logging and blowout prevention head for an oilfield water injection well, for example Figure 1 As shown. It comprises a main body 4, a first groove is provided on the bottom surface of the main body 4, a guide sleeve 6 is connected in the first groove through a standard thread, a second groove is provided on the top surface of the main body 4, a sealing body 3 is provided in the second groove through a standard thread, a third groove is provided at the bottom end of the sealing body 3, a nut 1 is connected in the third groove through a trapezoidal thread, the inner walls of the first groove, the second groove and the third groove are respectively provided with internal threads, the sides of the guide sleeve 6, the sealing body 3 and the nut 1 are respectively provided with external threads that can be matched with the internal threads of the inner walls of the first groove, the second groove and the third groove, and the purpose of detachable connection between various parts is achieved through the matching of various threads, which is convenient for the disassembly, installation and fixing of various parts, and at the same time, the pre-tightening force of the sealing body 3 and the nut 1 is controlled by the thread, which is independent of the pressure of the water injection well, and reduces the wear of the sealing body 3 and the nut 1.

[0024] A first dovetail groove is provided at the top of the sealing body 3, and a second dovetail groove is provided at the bottom of the nut 1. An upper sealing component 2 and a lower sealing component 5 are detachably connected in the second dovetail groove and the first dovetail groove, respectively. Conical holes are provided on the bottom surfaces of the second groove and the third groove. The upper sealing component 2 and the lower sealing component 5 have the same structure and both include a sealing head that can be adapted to the conical hole. The sealing head can be formed by splicing a plurality of sealing blocks 11. The conical hole and the sealing head can cooperate with each other, and their wear directions are also consistent. When the sealing head is worn, active compensation can be performed through the conical hole and the threaded pair. A sealing sleeve is clamped on the top of the sealing head, and a locking sleeve 9 is provided on the outer side of the sealing sleeve. The locking sleeve 9 is provided with a retaining spring 10 for clamping the sealing sleeve, and the retaining spring 10 is an elastic retaining spring for the shaft. The sealing sleeve includes an inner sleeve 7 and an outer sleeve 8 respectively clamped on the top and side of the sealing head, the inner sleeve 7 and the outer sleeve 8 fit each other, the top of the sealing head can be mutually engaged with the inner sleeve 7, and the side of the sealing head is provided with a groove that can be mutually engaged with one end of the outer sleeve 8, and the outer sleeve 8 can be inserted into the first dovetail groove or the second dovetail groove. In the present invention, the sealing head is spliced ​​by two sealing blocks 11 with the same appearance. It is spliced ​​by two sealing blocks 11 with the same appearance, which is convenient for installation and disassembly of the sealing head. At the same time, the inner sleeve 7 and the outer sleeve 8 can fix the sealing head.

[0025] The nut 1, the sealing body 3, the main body 4, the guide sleeve 6, the upper sealing assembly 2, and the lower sealing assembly 5 are all provided with mutually connected through holes for the passage of cables.

[0026] The sealing body 3 and the guide sleeve 6 are provided with sealing grooves, and sealing rings can be placed in the sealing grooves to improve the sealing performance of the sealing body 3 and the guide sleeve 6.

[0027] The present invention is provided with an upper sealing component 2 and a lower sealing component 3. Two sealing components are set. When the lower sealing component 3 works normally, the upper sealing component 2 does not work. When the lower sealing component 3 is worn and cannot work normally, the upper sealing component 2 can replace the lower sealing component 3 to perform sealing work. The upper sealing component 2 and the lower sealing component 3 are both connected to the nut 1 and the sealing body 3 through threaded connection. The threaded connection structure can ensure that the upper sealing component 2 and the lower sealing component 3 can still operate normally under high pressure.

[0028] The present invention not only improves the anti-overflow performance in the logging work of the water injection well by arranging the main body 4, the nut 1, the sealing body 3, the upper sealing assembly 2 and the lower sealing assembly 5, but also adopts a double-sealing structure, which improves the sealing performance of the sealing body 3 while reducing the wear of the upper sealing assembly 2 and the lower sealing assembly 5, thereby solving the problem that the sealing parts of the traditional anti-overflow device are prone to excessive wear and affect the logging work. The present invention has a compact structure, strong practicality, and is suitable for popularization and application.

[0029] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A well logging blowout preventer for oil field water injection wells, characterized in that: It comprises a main body, a first groove is provided on the bottom surface of the main body, a guide sleeve is detachably connected in the first groove, a second groove is provided on the top surface of the main body, a sealing body is detachably connected in the second groove, a first dovetail groove is provided at the bottom end of the sealing body, a third groove is provided at the top end of the sealing body, a nut is threadedly connected in the third groove, a second dovetail groove is provided at the bottom end of the nut, an upper sealing assembly and a lower sealing assembly are detachably connected in the second dovetail groove and the first dovetail groove, respectively, and a tapered hole is provided on the bottom surfaces of the second groove and the third groove; The upper sealing assembly and the lower sealing assembly have the same structure, both of which include a sealing head formed by splicing a plurality of sealing blocks and adapted to the tapered hole, and a sealing sleeve clamped to the sealing head, a locking sleeve is provided on the outer side of the sealing sleeve, and a retaining spring is provided on the locking sleeve to clamp the sealing sleeve, and a clearance fit is formed between the tapered hole and the sealing head; The nut, the sealing body, the main body, the guide sleeve, the upper sealing assembly and the lower sealing assembly are all provided with mutually connected through holes for the passage of the cable; The sealing sleeve comprises an inner sleeve and an outer sleeve respectively clamped on the top and side of the sealing head, and the inner sleeve and the outer sleeve are fitted to each other; The top end of the sealing head can be engaged with the inner sleeve, and the side of the sealing head is provided with a groove that can be engaged with one end of the outer sleeve, and the outer sleeve can be inserted into the first dovetail groove or the second dovetail groove.

2. The oilfield water injection well logging blowout preventer according to claim 1, characterized in that: The sealing head is formed by splicing two sealing blocks with the same appearance.

3. The oilfield water injection well logging blowout preventer according to claim 1, characterized in that: The threaded connection between the nut and the third groove is a trapezoidal thread.

4. The oilfield water injection well logging blowout preventer according to claim 1, characterized in that: The guide sleeve is connected to the first groove via a standard thread, and the sealing body is connected to the second groove via a standard thread.

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