CN112145161A - Source top-mounted neutron instrument capable of being salvaged - Google Patents
Source top-mounted neutron instrument capable of being salvaged Download PDFInfo
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- CN112145161A CN112145161A CN202010852035.3A CN202010852035A CN112145161A CN 112145161 A CN112145161 A CN 112145161A CN 202010852035 A CN202010852035 A CN 202010852035A CN 112145161 A CN112145161 A CN 112145161A
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- 238000007906 compression Methods 0.000 claims abstract description 44
- 239000000945 filler Substances 0.000 claims abstract description 26
- 230000002285 radioactive effect Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 20
- 238000012856 packing Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 6
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000002775 capsule Substances 0.000 claims 3
- 238000011109 contamination Methods 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003904 radioactive pollution Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a salvageable source top-mounted neutron instrument, which comprises: the fishing head subassembly, it includes: salvage head and filler, this salvage head's filler cavity is built-in to be equipped with the filler, is equipped with on its lateral wall: a weak point pin; the inner wall of the cavity of the upper joint is provided with a mounting groove, a clamping groove and an inner groove, and the weak point pin is clamped and resisted in the inner groove; a housing secured to the second end of the upper fitting; the spring is pressed the cover, and its cover is put on the lateral wall of fishing head, is equipped with on its lateral wall: a limiting protrusion; the compression ring is sleeved on the spring pressing sleeve and fixed at the first end of the mounting cavity; the compression spring is sleeved on the spring pressing sleeve and is in a compressed state; and the source bin assembly is positioned in the mounting cavity and is fixed at the opening end of the filling cavity. When the fishing tool is in use, the weak point pin is disconnected under the action of lifting force during fishing, and the fishing head assembly carries the source bin assembly to move upwards from the upper joint and the shell together, so that the risk caused by radioactive contamination is reduced.
Description
Technical Field
The invention relates to a source top-mounted neutron instrument, in particular to a salvageable source top-mounted neutron instrument.
Background
The neutron instrument logging is a formation porosity logging instrument, and the technical principle of the instrument is as follows: fast neutrons are emitted to the stratum through the chemical radioactive source, the fast neutrons are collided with stratum elements and decelerated into slow neutrons, the slow neutrons are quickly converted into thermal neutrons, and finally a thermal neutron cloud cluster is formed near the neutron source. Since the hydrogen element (H) in the stratum plays a decisive factor in the deceleration and slowing of neutrons, the concentration attenuation ratio of thermal neutrons near a neutron source is measured to estimate the content of the H element in the stratum. And the H element in the stratum exists only in stratum pore fluid (water and oil), thereby further deducing stratum porosity size.
The source and source bin structure of the conventional compensated neutron instrument is shown in fig. 1, wherein a neutron source 1 ' is installed in a source bin 2 ', and the source bin 2 ' is installed on the instrument. However, once the instrument with the structure is buried when being blocked, the instrument body is difficult to integrally salvage and recover when being blocked, the neutron source cannot be recovered, and therefore radioactive pollution to the underground aquatic product in the growing period is caused, and obviously, the instrument has great risk when being used in a shale gas complex well structure.
Disclosure of Invention
The invention aims to provide a salvageable source top-mounted neutron instrument, which solves the problem that the conventional neutron instrument is difficult to salvage, can salvage the neutron instrument and reduces the risk caused by radioactive pollution.
To achieve the above object, the present invention provides an overshot head assembly comprising: salvage head and stopping, the first end of this salvage head has salvages the structure, and has the second end and be equipped with the open-ended filler cavity, and the encapsulation has the stopping in this filler cavity, and has all seted up on the lateral wall of the first end of this filler cavity and second end: a pressure balancing eye in communication with the filler cavity; the side wall of the fishing head is symmetrically provided with: the side wall between the weak point pin and the second end of the fishing head is also provided with: a step II; the fishing head assembly comprises an upper joint and a lower joint, wherein the upper joint is provided with a through cavity, mounting grooves with opposite openings are symmetrically formed in the end face of a first end of the upper joint inwards along the inner wall of the cavity, the diameter of the cavity is smaller than the distance between the tail ends of two symmetrical weak point pins and smaller than or equal to the distance between the bottoms of the two symmetrical mounting grooves, clamping grooves penetrating through the mounting grooves are circumferentially arranged on the inner wall of the cavity, the clamping grooves are symmetrically recessed towards the side wall of one side, close to the first end of the upper joint, of the clamping grooves to form an inner groove, an angle is formed between the inner groove and the mounting groove in the cross section, the fishing head assembly penetrates through; the shell is detachably fixed at the second end of the upper joint and is provided with a mounting cavity with an opening at the first end, a shoulder II and a shoulder III with reduced inner diameters are sequentially arranged on the inner wall of the first end of the shell from outside to inside, the mounting cavity of the shell is opposite to the cavity of the upper joint, and the second end of the fishing head component is positioned in the mounting cavity of the shell; the spring is pressed the cover, and its cover is put on the lateral wall of fishing head, its first end card is in step two departments, the second end with the circular bead is three relative, and is equipped with on its lateral wall: the limiting protrusion is opposite to the second shoulder; the compression ring is sleeved on the spring pressing sleeve and detachably fixed at the first end of the mounting cavity, and the limiting protrusion of the spring pressing sleeve is positioned between the compression ring and the second shoulder; the compression spring is sleeved on the spring pressing sleeve, one end of the compression spring is clamped and abutted to the limiting protrusion, the other end of the compression spring is clamped and abutted to the second shoulder, and the compression spring is in a compression state; and the source bin assembly is positioned in the mounting cavity and is detachably fixed at the opening end of the filling cavity of the fishing head.
When the fishing tool is in a use state, when the fishing tool is used for fishing, the weak point pin is disconnected under the action of lifting force, the fishing head assembly drives the source bin assembly to move up from the upper joint and the shell together, the compression ring limits the spring pressing sleeve, the spring pressing sleeve is remained in the installation cavity of the shell, and the fishing head assembly salvages the source bin assembly out.
Preferably, the inner wall of the opening end of the filler cavity is provided with an internal thread, the first end of the source bin assembly is provided with an external thread, and the source bin assembly and the filler cavity are detachably and fixedly connected through the thread.
Preferably, the source cartridge assembly comprises: a neutron source and a source bin; wherein the neutron source is an active part of a radioactive source, and is provided with a standard neutron source structure which is fixedly connected in the source bin; the first end of the source bin is detachably and fixedly connected with the open end of the filling cavity of the fishing head through threads.
Preferably, the fishing head assembly further comprises: and the filler is encapsulated in the filler cavity through the compression plug screw.
Preferably, a shoulder is arranged on the inner wall of the packing cavity at a distance from the opening of the packing cavity, an internal thread is arranged at the shoulder, and the compression plug screw is matched with the packing cavity and the shoulder thereof and is provided with an external thread, is connected in the packing cavity through the thread and is limited through the shoulder on the inner wall of the packing cavity.
Preferably, the filler is made of paraffin; the aperture of the pressure balancing eye is phi 0.5-phi 2 mm.
Preferably, a rotary hexagonal structure is arranged on the side wall of the fishing head, close to the fishing structure, and is used for being connected with a source loading operating rod; the diameter of the end part of the fishing structure is increased to form a step-shaped structure; the rotating hexagonal structure is a hexagonal structure.
Preferably, on the lateral wall of the fishing head, a position between the rotating hexagonal structure and the step II is provided with: the weak point pin is symmetrically arranged on the first step, and the diameters of the first step and the second step are consistent with the inner diameter of the cavity of the upper joint.
Preferably, the inner wall of the opening end of the installation cavity of the outer shell is provided with: the inner diameter of the first shoulder is larger than that of the second shoulder; the pressure ring is limited and fixed at the first position of the shoulder.
Preferably, a threaded ring is further sleeved on the outer side wall of the upper connector, and the threaded ring is provided with an external thread.
The salvageable source top-mounted neutron instrument solves the problem that the conventional neutron instrument is difficult to salvage, and has the following advantages:
according to the neutron instrument, the fishing head is provided with the weak point pin, the source bin assembly is connected with the fishing head, and the weak point pin is broken through the pulling force, so that the fishing head and the source bin assembly are fished together, and the fishing is reliable. To the stability of source storehouse subassembly in the instrument, press the structural design of cover and compression spring through step and spring on the fishing head to realize the spring to an elasticity of fishing head, let the weak point round pin can block and support in the inside groove, prevent fishing head and neutron source subassembly drunkenness in the instrument, guarantee fishing head and source storehouse subassembly at the ascending stability of axial. Moreover, the filling material is sealed in the fishing head, so that the radioactive leakage can be effectively reduced.
Moreover, the structural design of the upper mounting groove, the clamping groove and the inner groove of the upper joint ensures that the fishing head is stably mounted in the cavity of the upper joint and cannot be separated from the mounting groove along with the rotation of vibration.
In addition, through the structural design of the pressure ring, the spring pressure sleeve is limited in the instrument when the fishing head is fished out. The pressure balance holes are formed in the side walls of the two ends of the fishing head, so that the internal pressure balance of the structure under high temperature and high pressure is ensured, and the fishing head is safe and reliable.
Drawings
Fig. 1 is a schematic structural diagram of a source and a source bin of a conventional compensated neutron instrument.
Fig. 2 is a schematic structural diagram of the salvageable source top-mounted neutron instrument of the present invention.
FIG. 3 is a cross-sectional view of an overshooting source top-loading neutron instrument of the invention.
Fig. 4 is a schematic structural diagram of the fishing head of the present invention.
Fig. 5 is a perspective view of the fishing head of the present invention.
FIG. 6 is a schematic diagram of a neutron source of the present invention.
Fig. 7 is a schematic view of the connection of the fishing head and the upper connector of the present invention.
Fig. 8 is a sectional view showing the connection of the fishing head and the upper joint of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An overshooting source top-loading neutron instrument, see fig. 2-8, comprising: the fishing head component, the upper joint 3, the shell 4, the pressing ring 6, the compression spring 7, the spring pressing sleeve 8 and the source bin component. Wherein, the spring is pressed the cover 8 and is put on fishing head subassembly, and compression spring 7 cover is put on the lateral wall of spring pressure cover 8, and the first end that the clamping ring 6 cover was put at spring pressure cover 8 is fixed in the first end of shell 4. The top connection 3 is fixed at the first end of shell 4, and the top connection 3 has a cavity that link up, and shell 4 is equipped with first end open-ended installation cavity, and this installation cavity is relative with the cavity of top connection 3, salvages head subassembly, clamping ring 6, compression spring 7, spring pressure cover 8 and source storehouse subassembly and is in top connection 3 and shell 4, and compression spring 7 card supports on the inner wall of the installation cavity of shell 4.
The fishing head subassembly includes: the fishing head 1, the filling material 5 and the compaction screw plug 9. Wherein, fishing head 1 has the filler cavity, and its first end has salvage structure 1 a. This salvage structure 1a forms step-like structure for the increase of tip diameter, and fishing tool can block in step-like structure department during salvage, and the opening of this packing cavity is at fishing head 1's second end. The filler 5 is made of paraffin, is filled in the filler cavity of the fishing head 1, and is sealed in the filler cavity through the compression screw plug 9, so that radioactivity leakage can be effectively reduced. Specifically, set up the circular bead apart from its opening part distance on the inner wall of filler cavity, and set up the internal thread in circular bead department, compress tightly plug screw 9 and filler cavity and circular bead looks adaptation thereof, and have the external screw thread, through threaded connection in the filler cavity to it is spacing through the circular bead on the filler cavity inner wall.
Moreover, all seted up on the lateral wall of the first end of the filler cavity of salvage head 1 and second end: and a pressure balancing hole 1f, the pressure balancing hole 1f being capable of balancing the pressure inside and outside the device. When the instrument enters the well, the external well fluid pressure can suddenly rise, the tube wall of the instrument is thin due to size limitation, if a pressure balance hole is not opened, the instrument cannot bear the external pressure, and the instrument can be extruded and deformed to be damaged. Under the high pressure effect, well liquid can fill in the inside space of instrument fast through the pressure balance eye on the fishing head 1 for inside and outside pressure reaches the balance, guarantees the safe and reliable of pipe. Pressure balance eye all sets up at first end and second end, and the air of inside can discharge fast like this, can make well liquid fill the instrument inner space moreover, and pressure balance eye's aperture can not be too big, in order to transmit hydraulic pressure smoothly, guarantees structural strength, avoids appearing the inside inconvenient abluent problem that leads to of bold silt entering fishing head simultaneously, and the aperture design is phi 0.5 ~ phi 2 mm.
The department is equipped with rotatory hexagonal structure 1b next-door neighbour on the lateral wall of fishing head 1 salvages structure 1a, still is equipped with in proper order between rotatory hexagonal structure 1b and its second end: a first step 1c and a second step 1 d. The rotating hexagonal structure 1b is a hexagonal structure and is used for being connected with a source loading operating rod, and installation and operation are facilitated. The first step 1c is symmetrically provided with a weak point pin 1e, and the weak point pin 1e is clamped in the cavity of the upper connector 3 and can be broken during fishing, so that the fishing head 1 is released. This two 1d of step are used for pressing cover 8 to the spring spacing, and the terminal surface card of the first end of spring pressure cover 8 supports in two 1d departments of this step, and the one end card of compression spring 7 supports on spring pressure cover 8 this moment, and the other end card supports on the inner wall of the installation cavity of shell 4, prevents to salvage first and neutron source subassembly drunkenness in the instrument. The first step 1c and the second step 1d have diameters corresponding to the inner diameter of the cavity of the upper joint 3.
The spring pressing sleeve 8 is provided with a through cavity, the fishing head 1 is matched with the cavity, and the fishing head 1 is sleeved on the outer side wall of the fishing head 1. The outer side wall of the spring pressing sleeve 8 is circumferentially provided with a limiting protrusion close to the first end of the spring pressing sleeve.
The inside diameter of the three shoulders that reduce are arranged in proper order from outside to inside on the inner wall of the open end of the installation cavity of the shell 4: shoulder one, shoulder two and shoulder three. The spring pressing sleeve 8 is sleeved on the outer side wall of the fishing head 1 and is located at the first end of the mounting cavity of the shell 4, and the limiting protrusion of the spring pressing sleeve 8 and the end surface of the second end of the spring pressing sleeve are opposite to the positions of the second shoulder and the third shoulder at the opening end of the mounting cavity respectively. The compression spring 7 is sleeved on the outer side wall of the spring pressing sleeve 8, one end of the compression spring is clamped and abutted to the limiting protrusion of the spring pressing sleeve 8, and the other end of the compression spring is clamped and abutted to the second shoulder at the opening end of the installation cavity. The first end of compression spring 7 and spring pressure cover 8 installation in the installation cavity of shell 4 can be withstood fishing head 1, prevents to become flexible. The clamping ring 6 is sleeved on the outer side wall of the first end of the spring pressing sleeve 8, the clamping ring 6 is clamped to a first shoulder at the opening end of the installation cavity and fixed at the opening end of the installation cavity of the shell 4, and the limiting protrusion of the spring pressing sleeve 8 can be clamped to the clamping ring 6, so that the limiting is limited by the clamping ring 6. During fishing, the spring pressing sleeve 8 and the compression spring 7 are left in the mounting cavity of the shell 4 through the limit of the pressing ring 6.
The source bin assembly includes: a neutron source 10 and a source bin 11. The neutron source 10 is an active part of a radioactive source, and has a standard neutron source structure (see fig. 6, the active source is packaged in a metal shell, the metal shell comprises a left part and a right part, the left part and the right part are connected through threads, hexagonal clamping grooves are formed in the surfaces of the left metal shell and the right metal shell, so that the assembly and the disassembly are convenient, an annular groove is usually formed in the middle of the left metal shell, and the clamping and the positioning are convenient during fishing or clamping), and the active part is fixedly connected in a source bin 11. The first end of the source bin 11 is provided with external threads, the open end of the packing cavity is provided with internal threads, and the source bin 11 is in threaded connection with the internal threads at the end of the packing cavity of the fishing head 1.
The outer side wall of the upper joint 3 is also sleeved with a threaded ring 2 with a threaded outer side wall. The outer side wall of the upper joint 3 is provided with: the limiting groove and the threaded ring 2 are formed by two half threaded rings which are combined and fixed together, the limiting groove can be used for connecting instruments with directional requirements, the threaded ring 2 is rotated, and the threaded ring 2 can be directly connected with the instruments with the directional requirements in a rotating mode.
The first end face of the upper joint 3 is symmetrically arranged inwards along the inner wall of the cavity: the diameter of the cavity of the upper joint 3 < the distance between the ends of the two weak point pins 1e < the distance between the bottoms of the two symmetrical mounting grooves 3 a. The upper connector 3 is circumferentially provided with: the clamping groove 3b penetrates through the mounting groove 3a and is communicated with the mounting groove 3a, the clamping groove 3b is symmetrically recessed towards the side wall of one side of the clamping groove 3b to form an inner groove 3c, and the inner groove 3c is arranged on the side wall of the clamping groove 3b close to the side of the first end of the upper connector 3. The weak point pin 1e of the bottom fishing head 1 is placed in from the mounting groove 3a of the upper joint 3 and enters the clamping groove 3b after rotating, when the fishing head 1 is rotated to the inner groove 3c, the fishing head 1 is loosened, and the weak point pin 1e of the fishing head 1 is clamped in the inner groove 3c under the elastic action of the compression spring 7, so that the fishing head 1 is stably mounted in the cavity of the upper joint 3 and cannot be separated from the mounting groove 3a along with the rotation of vibration.
Further, in cross section, the inner groove 3c and the mounting groove 3a are at 90 degrees therebetween.
The invention discloses a using method of a salvage source top-mounted neutron instrument, which comprises the following steps:
(1) before loading, filling material 5 is loaded into a filling cavity of the fishing head 1, then the filling material 5 is compressed and sealed by a compression screw plug 9, and the compression screw plug 9 is clamped and propped against a shoulder on the inner wall of the filling cavity; the spring pressing sleeve 8 is sleeved on the fishing head 1; fixing a neutron source 10 in a source bin 11, and fastening the source bin 11 and the fishing head 1 through threaded connection;
(2) sleeving a compression spring 7 on the outer side wall of a spring pressing sleeve 8, inserting the spring pressing sleeve 8 into an installation cavity of the shell 4, sleeving a compression ring 6 on the first end of the spring pressing sleeve 8, and clamping and abutting the compression ring to a limit protrusion of the upper spring pressing sleeve 8, wherein the compression spring 7 is in a compression state, and the compression ring 6 is fixed at the first end of the shell 4; at this time, the housing 4 may be screwed with the upper joint 3;
(3) salvage first 1 and source storehouse subassembly with the integration equipment and insert the installation intracavity of shell 4 from the cavity of top connection 3, aim at mounting groove 3a on the top connection 3 and insert to draw-in groove 3b with two weak point round pins 1e on the first 1 of salvageing, at this moment, this step two 1d pushes away and extrudes spring pressure cover 8, make spring pressure cover 8 remove in to the installation intracavity of shell 4, and extrude compression spring 7, and shoulder three in the installation intracavity of shell 4 can be pressed cover 8 to the spring and carry out spacingly, make the too big weak point round pin 1e that leads to of power damage when avoiding inserting. The weak point pin 1e of the fishing head 1 rotates along the clamping groove 3b, when the fishing head 1 rotates to the inner groove 3c, the fishing head 1 is loosened, and the weak point pin 1e of the fishing head 1 is clamped into the inner groove 3c under the action of the elastic force of the compression spring 7, so that the fishing head 1 is stably installed in the cavity of the upper joint 3 and cannot rotate to the position of the installation groove 3a to be separated along with vibration;
(4) during fishing, the fishing head 1 is directly lifted by the tensile force of the upper end, at the moment, two weak point pins 1e on the fishing head 1 can be broken, the fishing head 1 and the source bin assembly are fished together, and the spring pressing sleeve 8 is limited by the pressing ring 6 and is left in the mounting cavity of the shell 4. The neutron source is installed in the integration subassembly, salvages midway and can not drop, convenient and fast, safe and reliable.
Safe salvaging of the neutron source can be realized by operating according to the steps, so that the pollution risk caused by long-term leakage of the radioactive source is avoided.
The "first end" and the "second end" in the present invention are two ends of a component or a part, respectively, and a "front end", "rear end" or other expressions may also be used, which is an expression of a relative position of two ends of a component or a part, and does not affect understanding of technical solutions of the present invention by those skilled in the art. In addition, when the neutron source is salvaged, the instrument is in a vertical state, the first end is the upper end, and the second end is the lower end.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A salvageable source top-loading neutron instrument, the neutron instrument comprising:
the fishing head subassembly, it includes: salvage first (1) and stopping (5), the first end of this salvage head (1) has salvage structure (1a), and has the second end and be equipped with open-ended filler cavity, and the encapsulation has stopping (5) in this filler cavity, and has all seted up on the lateral wall of the first end of this filler cavity and second end: a pressure balancing eye (1f), the pressure balancing eye (1f) being in communication with the filler cavity; the side wall of the fishing head (1) is symmetrically provided with: the side wall between the weak point pin (1e) and the second end of the fishing head (1) is also provided with a weak point pin (1 e): a second step (1 d);
the fishing head assembly comprises an upper joint (3) and a fishing head assembly, wherein the upper joint is provided with a through cavity, the end face of the first end of the upper joint is inwards provided with mounting grooves (3a) with opposite openings symmetrically along the inner wall of the cavity, the diameter of the cavity is smaller than the distance between the tail ends of two symmetrical weak point pins (1e) and is smaller than the distance between the bottoms of the two symmetrical mounting grooves (3a), the inner wall of the cavity is circumferentially provided with clamping grooves (3b) penetrating through the mounting grooves (3a), the clamping grooves (3b) are symmetrically recessed towards the side wall of one side, close to the first end of the upper joint (3), of the clamping grooves to form inner grooves (3c), in the cross section, the inner grooves (3c) and the mounting grooves (3a) form an angle, the fishing head assembly penetrates through the cavity of the fishing head assembly, and the;
the shell (4) is detachably fixed at the second end of the upper joint (3) and is provided with a mounting cavity with an opening at the first end, a shoulder II and a shoulder III with reduced inner diameters are sequentially arranged on the inner wall of the first end of the shell from outside to inside, the mounting cavity of the shell is opposite to the cavity of the upper joint (3), and the second end of the fishing head component is positioned in the mounting cavity of the shell;
the spring pressing sleeve (8) is sleeved on the side wall of the fishing head (1), the first end of the spring pressing sleeve is clamped at the second step (1d), the second end of the spring pressing sleeve is opposite to the third shoulder, and the side wall of the spring pressing sleeve is provided with: the limiting protrusion is opposite to the second shoulder;
the compression ring (6) is sleeved on the spring pressing sleeve (8) and detachably fixed at the first end of the mounting cavity, and the limiting protrusion of the spring pressing sleeve (8) is positioned between the compression ring (6) and the second shoulder;
the compression spring (7) is sleeved on the spring pressing sleeve (8), one end of the compression spring is clamped and abutted to the limiting protrusion, the other end of the compression spring is clamped and abutted to the second shoulder, and the compression spring is in a compressed state; the source bin assembly is positioned in the mounting cavity and is detachably fixed at the opening end of the filling cavity of the fishing head (1);
when the fishing tool is in a use state, when the fishing tool is used for fishing, the weak point pin (1e) is disconnected under the action of lifting force, the fishing head assembly drives the source bin assembly to move up from the upper joint (3) and the shell (4) together, the compression ring (6) limits the spring pressing sleeve (8), the spring pressing sleeve (8) is left in the installation cavity of the shell (4), and the fishing head assembly salvages the source bin assembly out.
2. The salvageable source top-loading neutron instrument according to claim 1, wherein an inner thread is provided on an inner wall of the open end of the packing cavity, an outer thread is provided at the first end of the source capsule assembly, and the source capsule assembly and the packing cavity are detachably and fixedly connected through the thread.
3. The overshoots source-mounted neutron instrument of claim 1, wherein the source capsule assembly comprises: a neutron source (10) and a source bin (11); wherein the neutron source (10) is an active part of a radioactive source and has a standard neutron source structure, and is fixedly connected in the source bin (11); the first end of the source bin (11) is detachably and fixedly connected with the open end of the filling cavity of the fishing head (1) through threads.
4. The overshoots source top-loading neutron instrument of claim 1, wherein the fishing head assembly further comprises: and the packing material (5) is encapsulated in the packing cavity through the compression screw plug (9).
5. The salvageable source top-loading neutron instrument according to claim 4, wherein a shoulder is arranged on the inner wall of the packing cavity at a distance from the opening of the packing cavity, an internal thread is arranged at the shoulder, the compression screw plug (9) is matched with the packing cavity and the shoulder thereof, is provided with an external thread, is connected in the packing cavity through the thread, and is limited through the shoulder on the inner wall of the packing cavity.
6. The salvageable source top-loading neutron instrument according to claim 1, wherein the filler (5) is a paraffin material; the aperture of the pressure balance eye (1f) is phi 0.5-phi 2 mm.
7. The salvageable source top-loading neutron instrument according to any one of claims 1 to 6, characterized in that a rotating hexagonal structure (1b) is arranged on the side wall of the fishing head (1) and is adjacent to the fishing structure (1a) and is used for being connected with a source loading operating rod; the fishing structure (1a) is a stepped structure formed by increasing the diameter of the end part; the rotating hexagonal structure (1b) is a hexagonal structure.
8. The salvageable source top-loading neutron instrument according to claim 7, wherein on the side wall of the fishing head (1), between the rotating hexagonal structure (1b) and the second step (1d) is provided: the first step (1c), the weak point pin (1e) is symmetrically arranged on the first step (1c), and the diameters of the first step (1c) and the second step (1d) are consistent with the inner diameter of the cavity of the upper joint (3).
9. The salvageable source top-loading neutron instrument according to any one of claims 1 to 6, wherein the inner wall of the opening end of the installation cavity of the housing (4) is provided with: the inner diameter of the first shoulder is larger than that of the second shoulder; the pressing ring (6) is limited and fixed at the first shoulder.
10. The salvageable source top-loading neutron instrument according to claim 1, wherein a threaded ring (2) is further sleeved on the outer side wall of the upper connector (3), and the threaded ring (2) is provided with an external thread.
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| CN202010852035.3A CN112145161B (en) | 2020-08-21 | 2020-08-21 | Source top-mounted neutron instrument capable of being salvaged |
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| CN112145161B CN112145161B (en) | 2022-05-17 |
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| CN112145161B (en) | 2022-05-17 |
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Effective date of registration: 20220126 Address after: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: Sinopec Jingwei Co.,Ltd. Applicant after: Southwest measurement and control company of Sinopec Jingwei Co.,Ltd. Address before: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: Logging branch of Sinopec Southwest Petroleum Engineering Co., Ltd |
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