Anti-jamming medicament injection device for steel wire operation

Abstract

The invention belongs to the technical field of oil and gas field steel wire under-pressure operation, and particularly discloses a steel wire operation anti-jamming medicament injection device which comprises a body and an anti-jamming unit, and the anti-jamming unit is located in a mounting cavity of the body; the anti-jamming unit comprises a pressing cylinder, an upper cleaning layer and a lower cleaning layer, the lower cleaning layer comprises a perforated copper pad and a dirt guide copper pad which are coaxially arranged, an inner hole and a plurality of flow guide holes are formed in the perforated copper pad, the flow guide holes are circumferentially distributed in the end face of the perforated copper pad, and the dirt guide copper pad is located above the perforated copper pad; a dirt guide hole is coaxially formed in the dirt guide copper pad; a gap is formed between the inner hole and the steel wire; through holes are coaxially formed in the upper cleaning layer and the top of the pressing cylinder and are in interference fit with the steel wire. According to the blowout prevention box, the steel wire can be cleaned, clamping stagnation of the lifted steel wire at the position of the sealing packing in the blowout prevention box is effectively prevented, and therefore abrasion and consumption of the sealing packing in the blowout prevention box are reduced, and the situation of sealing leakage or sealing loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel wire pressing operations in oil and gas fields, and in particular to a steel wire operation anti-jamming agent injection device. Background Art

[0002] In traditional steel wire pressure operation in oil and gas fields, the steel wire blowout preventer is one of the necessary wellhead operation equipment. Its main pressure-bearing components installed vertically at the wellhead mainly include the sealing control head (blowout preventer box), blowout preventer, lower catcher, blowout preventer (BOP), wellhead connection conversion flange or conversion joint and other components.

[0003] At present, due to the large amount of sand injected into each production well in the Jinqiu block of tight gas, the gas wells are produced with sand for a long time. The sand enters the steel wire blowout prevention device along with the airflow and steel wire, causing the dynamic seal packing, fracturing sand and other dirt in the blowout prevention box to be blocked. The special fluid properties of tight gas are prone to form hydrates in the gas tree, blowout preventer and within 300m below the wellhead, resulting in the breakage of the well test steel wire and the complicated risk of handling downhole. The above phenomenon is mainly due to the following problems: Fracturing sand and other attachments on the running steel wire cannot be effectively removed: dirt mixed with sand particles adheres to several thousand meters of steel wire, and the dirt enters the blowout preventer with the airflow and steel wire. The dynamic sealing packing in the blowout preventer box is tightly fitted with the steel wire and has a certain elasticity. The dirt enters the dynamic sealing packing and accumulates continuously, then jams the steel wire, and then breaks the steel wire and creates the risk of complex well conditions downhole again. The combined effect of hydrates and fracturing sand will aggravate the difficulty of dealing with the stuck objects in the dynamic sealing packing in the blowout preventer box. In view of this, there are two main measures at present: one is to operate when the sand output is small, and at the same time, boiler trucks or pumping trucks are required to cooperate with the operation. This process has five problems: difficult to choose the timing, long time for multi-party cooperation, low efficiency, high cost, and high risk; the second is to cooperate with the grease injection system and the chemical injection nipple (installed between the blowout preventer box and the blowout preventer) to inject chemicals to eliminate the risk of blockage in the well and wellhead. The grease injection system can lubricate the steel wire throughout the process, but it does not have the ability to remove the sand stuck in the fracturing sand. The chemical injection nipple is used alone to clean and lubricate the steel wire. The function is limited, and the steel wire and dynamic seal packing cannot be cleaned and maintained over a long distance, so that the steel wire and the dynamic seal packing are in dry friction motion for a long time; it does not have a sewage discharge function, resulting in the accumulation of dirt such as fracturing sand in the felt long dynamic seal packing; it cannot inject the unblocking agent and lubricant at the same time, and cannot meet the ability to inject the unblocking agent and clean the steel wire at a large displacement at the same time. In addition, the matching price of the grease injection system and the chemical injection nipple is high and the operation is complicated. Summary of the invention

[0004] The present invention provides a device for injecting medicaments to prevent jamming of steel wire operations, the purpose of which is to clean the steel wire and effectively prevent the lifting steel wire from getting stuck at the sealing packing in the blowout preventer box, thereby reducing the wear and consumption of the sealing packing in the blowout preventer box and reducing the occurrence of sealing leakage or loss of sealing.

[0005] The present invention is implemented by the following technical scheme: a wire operation anti-jamming agent injection device, comprising a body and an anti-jamming unit, wherein the upper end and the lower end of the body are respectively connected to a blowout prevention box and a blowout prevention pipe, an installation cavity is provided inside the body, and the anti-jamming unit is located in the installation cavity of the body; The anti-jamming unit comprises a pressing cylinder, an upper cleaning layer and a lower cleaning layer, wherein the upper cleaning layer is located inside the pressing cylinder, the lower cleaning layer is located at the bottom of the pressing cylinder, and the interior of the pressing cylinder is hollow; The lower cleaning layer comprises a coaxially arranged perforated copper pad and a pollution-guiding copper pad, the perforated copper pad is provided with an inner hole and a plurality of flow-guiding holes, the inner hole is located at the center of the perforated copper pad, the plurality of flow-guiding holes are circumferentially distributed on the end surface of the perforated copper pad, the pollution-guiding copper pad is located above the perforated copper pad, and the pollution-guiding copper pad is coaxially provided with a pollution-guiding hole; there is a gap between the inner hole and the steel wire, and the gap between the inner hole and the steel wire is smaller than the particle size of the fracturing sand; the upper cleaning layer and the top of the pressure cylinder are both coaxially provided with through holes, and the through holes are interference-fitted with the steel wire; A first injection port is connected to the side surface of the body, and the first injection port is communicated with the pressing cylinder.

[0006] Compared with the prior art, the present invention has the following advantages: the upper cleaning layer and the lower cleaning layer in the anti-jamming unit of the present invention can clean the stains on the surface of the steel wire in turn, and the steel wire passes through the upper cleaning layer and the lower cleaning layer in turn. When the steel wire is lifted up, the steel wire will scrape against the inner hole on the perforated copper pad in the lower cleaning layer and the upper cleaning layer in turn, and block the larger fracturing sand and other dirt on the steel wire outside, so that the steel wire can be cleaned and the lifting steel wire can be effectively prevented from getting stuck at the sealing packing in the blowout preventer box, thereby reducing the wear and consumption of the sealing packing in the blowout preventer box and reducing the occurrence of sealing leakage or loss of sealing.

[0007] The lower cleaning layer in the present solution also includes a dirt guide copper pad. The stains scraped off the upper cleaning layer will fall from the dirt guide holes on the dirt guide copper pad into the end surface of the perforated copper pad and be guided into the well from multiple guide holes. This can effectively prevent larger dirt such as fracturing sand from accumulating in the perforated copper pad or the upper cleaning layer and causing new blockages.

[0008] In the present invention, the gap between the inner hole of the perforated copper pad and the steel wire is smaller than the particle size of the fracturing sand, and the through holes on the upper cleaning layer are interference fit with the steel wire. In this way, cleaning is carried out in order from large to small, which can first block larger dirt such as fracturing sand on the steel wire, and then remove smaller dirt, thereby achieving a multi-stage cleaning effect and improving the cleaning intensity of the steel wire.

[0009] Furthermore, the upper cleaning layer includes a plurality of coaxially stacked felt pads. Lubricating oil can be injected through the first injection port, so that the felt pad can absorb the lubricating oil. The lubricating oil absorbed on the felt pad has both lubricating and cleaning effects on the steel wire. Chemical substances can also be injected through the first injection port to achieve the purpose of unblocking.

[0010] Furthermore, the anti-jamming unit also includes a middle cleaning layer, and the middle cleaning layer is located between the upper cleaning layer and the lower cleaning layer, and a through hole is also opened in the center of the middle cleaning layer. In this solution, a middle cleaning layer is added between the upper cleaning layer and the lower cleaning layer, which can scrape off small granular hard dirt (such as fracturing sand) or hydrate dirt attached to the surface of the steel wire that is not scraped off by the lower cleaning layer, thereby improving the cleaning effect of the steel wire.

[0011] Furthermore, the middle cleaning layer is a rubber pad. The rubber pad is deformable and can be in flexible contact with the steel wire to avoid damaging the steel wire. In addition, the rubber pad is also a sealing base to prevent lubricating oil or cleaning agent from falling into the well.

[0012] Furthermore, an upper copper pad and a lower copper pad are respectively provided at the top and bottom of the upper cleaning layer, wherein the upper copper pad is located on the top wall of the pressing cylinder, and the lower copper pad is located at the bottom end of the pressing cylinder and abuts against the side wall of the mounting cavity of the body. In this solution, the upper copper pad and the lower copper pad can limit and fix the upper cleaning layer in the pressing cylinder, prevent the upper cleaning layer from moving, maintain the stability of the upper cleaning layer, and thus better clean the steel wire.

[0013] Furthermore, the top of the perforated copper pad is an arc-shaped concave surface. The arc-shaped concave surface in this solution can accommodate granular hard dirt or hydrate dirt scraped off by the upper cleaning layer, which can play a guiding role, and can more smoothly guide these dirt into the guide holes of the perforated copper pad and fall out, which can further avoid accumulation.

[0014] Furthermore, an oil cup is provided on the upper part of the body and above the anti-jamming unit. In this solution, the oil cup can store the injected lubricating oil for later lubrication, so that the lubricating oil does not need to be injected into the interior through the first injection port all the time.

[0015] Furthermore, the main body is provided with a first vertical hole vertically leading to the oil cup and a first transverse hole transversely leading to the pressure cylinder, the first transverse hole is communicated with the first vertical hole, and the first injection port is communicated with the first transverse hole. In this solution, the first transverse hole enables the injected lubricating oil to directly infiltrate the upper cleaning layer, while the first vertical hole facilitates the lubricating oil to enter the oil cup for storage.

[0016] Furthermore, a second injection port is provided on one side of the body, and the second injection port and the first injection port are respectively located on both sides of the body, and a second vertical hole arranged vertically and a second transverse hole arranged transversely are provided on the body, and the second transverse hole is communicated with the second vertical hole, and the two ends of the second vertical hole are respectively communicated with the oil cup and the body, and a plug for plugging the orifice of the second vertical hole is provided at the top. In this scheme, two injection ports are used, wherein the second injection port can meet the requirement of injecting chemicals required for the operation process into the blowout preventer, the wellhead or the wellbore in large displacement, and the first injection port can meet the requirement of injecting chemicals such as lubricating oil, cleaning agent or solvent in small displacement and be effectively stored in the oil storage space.

[0017] During normal use, the wire plug blocks the second vertical hole so that the chemical injected from the second injection port can flow downhole to help remove the blockage caused by dirt downhole, so that the unblocking agent and the lubricant have relatively independent oil transportation channels, ensuring the unblocking and lubrication effects. When it is necessary to unblock the components on the well, the wire plug can be taken out, the second vertical hole can be connected to the upper part of the well, and then the unblocking agent can be injected to unblock the hole. At the same time, it is convenient to take out the wire plug to maintain the oil transportation channel during maintenance.

[0018] Furthermore, the side wall of the pressure cylinder is provided with a plurality of leakage holes along its axial direction, and a gap is provided between the pressure cylinder and the installation cavity. The arrangement of the plurality of leakage holes in this solution facilitates the injected lubricant to quickly penetrate into the upper cleaning layer.

[0019] Beneficial effects of the present invention: 1. The present invention provides a safer and more reliable interface and channel for injecting chemical substances (unblocking agents and lubricants) into the steel wire blowout prevention device during pressure operation in gas wells, and provides suitable and effective ways and means for lubricating and cleaning the lifting steel wire. The cleaning effect of the lifting steel wire is good, and it can effectively prevent the lifting steel wire from getting stuck at the sealing head of the blowout prevention box. At the same time, it can effectively reduce the wear and consumption of the sealing packing of the sealing head, reduce the operating cost, reduce the occurrence of sealing leakage or loss of sealing, and increase the safety of construction operations.

[0020] 2. The oil cup can store hydraulic oil or lubricant, so that the oil cup provides sufficient lubricating oil to the lifting wire, so that the dry friction between the fast and continuous lifting wire and the compressed rubber packing on the sealing head is converted into wet friction lubricated by lubricating oil, which can effectively increase the sealing reliability of the sealing head and improve the safety of operation.

[0021] 3 The vertical upward channel of the first injection port connects the anti-jamming unit and the anti-blowout box, increasing the oil storage space; and the lower rubber pad makes the oil storage space well sealed, and the lubricating oil stored in the oil cup will not fall into the well. One oil injection can keep the oil storage time for a long time, and can continuously lubricate the steel wire for 20,000m, meeting the lubrication and cleaning requirements of long-distance steel wire.

[0022] 4. The anti-jamming unit in the present invention has three layers of cleaning wire ports, which clean the fracturing sand or dirt on the lifting wire in different ways, and can effectively prevent the lifting wire from getting stuck at the sealing head due to the attached wax or dirt.

[0023] 5. Of the two injection ports, the second injection port can meet the requirement of injecting chemical substances required for the operation process into the blowout preventer, wellhead or wellbore in large displacement, while the first injection port can meet the requirement of injecting lubricating oil, cleaning agent or solvent and other chemical substances in small displacement and effectively store them in the oil storage space. In practical applications, double check valves can be set in series in the interfaces of the two injection ports to ensure that the gas in the well will not flow into the injection pipeline due to problems with the check valve during the operation, thereby improving the safety of the construction operation.

[0024] The double-sided dual-channel agent injection port design of the anti-blocking agent injection device in this embodiment eliminates the disadvantages of the traditional agent injection port being a single-sided single-channel port that cannot simultaneously and quickly inject the unblocking agent and the lubricant. It has a double insurance function to prevent wellbore gas from entering the injection pipeline, and the safety is greatly improved.

[0025] 6. The first injection port is connected to the body on one side, with a horizontal channel leading to the felt pad and a vertical channel leading to the oil cup, which can ensure that all the felt pads in the pressure cylinder are fully lubricated. Lubricating oil can be injected through this port to lubricate the lifted steel wire, so that the dry friction continuous movement between the steel wire and the rubber packing of the sealing head is changed into wet friction movement with oil lubrication, which increases the wear resistance of the rubber packing and makes the rubber packing less prone to wear or aging, effectively improves the sealing ability of the sealing head, and reduces ice and freezing caused by seal leakage or failure due to packing wear or aging. Once the sealing failure or serious leakage of the sealing head cannot be controlled and occurs, it is a construction accident in itself. Therefore, the lubrication and lifting steel wire function can also effectively reduce the occurrence of blowout accidents.

[0026] Once the sealing head freezes and blocks, methanol or ethylene glycol and other antifreeze and thawing chemicals can be injected through the first injection port to relieve the freezing and blocking of the sealing head or prevent freezing and blocking. The perforated copper pad and the contamination-guiding copper pad can remove the formation dirt attached to the steel wire, such as fracturing sand and hydrate, and can redirect the cleaned larger dirt into the well.

[0027] 7. The pressure cylinder, felt pad, oil cup and rubber pad form a relatively closed lubrication oil storage system. The relatively closed lubrication oil storage system design eliminates the shortcomings of traditional wire operation due to open lubrication channels and high thermal cavitation caused by dry friction movement due to overspeed and long stroke, ensuring continuous wet friction movement between the wire and the dynamic sealing packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 It is a longitudinal cross-sectional view of an embodiment of a wire operation anti-jamming agent injection device of the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 A three-dimensional diagram of a copper pad with holes in an embodiment of a device for injecting an anti-jamming agent for steel wire operation according to the present invention; Figure 4 It is an exploded view of the anti-jamming unit in an embodiment of the anti-jamming agent injection device for wire work of the present invention.

[0029] Marks and corresponding parts names in the attached drawings: Main body 1, first injection port 2, second injection port 3, screw plug 4, upper copper pad 5, linoleum pad 6, lower copper pad 7, rubber pad 8, sewage guide copper pad 9, sewage guide hole 901, perforated copper pad 10, diversion hole 101, inner hole 102, pressure cylinder 11, one-way valve 12, oil cup 13, blowout preventer box connecting section 14, blowout preventer connecting section 15. Implementation

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0031] like Figure 1 and Figure 2 As shown, the present embodiment provides an anti-jamming agent injection device for wire operation, comprising a main body 1 and an anti-jamming unit, the upper end of the main body 1 is a blowout preventer box connecting section 14, the lower end of the main body 1 is a blowout preventer pipe connecting section 15, the upper end and the lower end of the main body 1 are respectively threadedly connected to the blowout preventer box and the blowout preventer pipe through the blowout preventer box connecting section 14 and the blowout preventer pipe connecting section 15, the main body 1 is hollow inside, and an installation cavity is provided inside the main body 1, the installation cavity is located at the upper part of the main body 1, and the anti-jamming unit is located in the installation cavity of the main body 1, the area of ​​the bottom opening of the installation cavity is smaller than the bottom area of ​​the anti-jamming unit, thereby being able to serve as a limiting support for the anti-jamming unit.

[0032] The anti-jamming unit in this embodiment includes a pressure cylinder 11, an upper cleaning layer and a lower cleaning layer. In this embodiment, the anti-jamming unit also includes a middle cleaning layer, and the middle cleaning layer is located between the upper cleaning layer and the lower cleaning layer. Through holes are coaxially opened on the upper cleaning layer and the top of the pressure cylinder 11, and the through holes of the upper cleaning layer are interference-fitted with the steel wire. Through holes are also coaxially opened on the middle cleaning layer, and the through holes on the middle cleaning layer are also interference-fitted with the steel wire.

[0033] The pressure cylinder 11 is hollow inside, the upper cleaning layer is located inside the pressure cylinder 11, there is a gap between the pressure cylinder 11 and the installation cavity, and the lower cleaning layer is located at the bottom of the pressure cylinder 11. In this embodiment, the upper cleaning layer includes a plurality of coaxially overlapping linoleum pads 6, and a through hole is coaxially provided in the center of the plurality of linoleum pads 6. In this embodiment, the linoleum pad material is preferably a material that can work continuously underground for more than 25 days, and the felt, copper pad, and rubber pad are highly wear-resistant materials, so that it can be reused for 10 wells, and the continuous lubrication and maintenance of the steel wire can reach more than 30,000 meters, solving the problem of poor wear resistance and fragility of the linoleum pad of the traditional chemical injection short section.

[0034] In this embodiment, an oil cup 13 is provided at the upper part of the main body 1 and above the anti-jamming unit. The oil cup 13 is connected to the top of the installation cavity, so that the lubricating oil stored in the oil cup 13 can enter the interior of the linoleum pad 6 through the through hole at the top of the pressing cylinder 11 and infiltrate the linoleum pad 6.

[0035] The middle cleaning layer in this embodiment is a rubber pad 8, which is tightly matched with the inner wall of the installation cavity. The rubber pad 8 is also a sealing base to prevent lubricating oil or cleaning agent from falling into the well, and can form a relatively closed lubrication system with the oil cup 13.

[0036] like Figure 2 As shown, in this embodiment, the top and bottom ends of the upper cleaning layer are respectively provided with an upper copper pad 5 and a lower copper pad 7, and through holes are also opened in the center of the upper copper pad 5 and the lower copper pad 7. The upper copper pad 5 is located on the top wall of the pressing cylinder 11, and the lower copper pad 7 is located at the bottom end of the pressing cylinder 11 and abuts against the side wall of the mounting cavity of the main body 1, and the rubber pad 8 is located at the bottom of the lower copper pad 7. The lower copper pad 7 and the upper copper pad 5 can limit and fix the linoleum pad 6 to prevent the linoleum pad 6 from shifting, and the lower copper pad 7 can seal the bottom end of the pressing cylinder 11 and play a preliminary oil-blocking role, and the rubber pad 8 can form a sealing structure again to improve the sealing effect.

[0037] In this embodiment, the lower cleaning layer includes a coaxially arranged perforated copper pad 10 and a contamination-guiding copper pad 9, the diameters of which match the inner diameter of the mounting cavity, an inner hole 102 and a plurality of flow-guiding holes 101 are provided on the perforated copper pad 10, the inner hole 102 is located in the center of the perforated copper pad 10, and a plurality of flow-guiding holes 101 are circumferentially distributed on the end surface of the perforated copper pad 10, the contamination-guiding copper pad 9 is located above the perforated copper pad 10, and a contamination-guiding copper pad 9 is coaxially provided with a contamination-guiding hole 102. The diameter of the dirt hole 901 and the dirt guide hole 901 is larger than the diameter of the inner hole 102, so as to facilitate the drainage of dirt. In this embodiment, the top of the perforated copper pad 10 is an arc-shaped concave surface, which can accommodate the granular hard dirt (such as fracturing sand) or hydrate dirt scraped from the upper cleaning layer and the second layer of the rubber pad 8. The dirt scraped from the rubber pad 8 can fall into the well through these diversion holes 101, and will not cause the accumulation of granular hard dirt or hydrate dirt on the arc surface of the perforated copper pad 10. The design of the diversion hole and the arc-shaped diversion surface of the perforated copper pad solves the problems of dirt accumulation and pressure holding in the traditional agent injection short section.

[0038] In this embodiment, there is a gap between the inner hole 102 and the steel wire, and the gap between the inner hole 102 and the steel wire is smaller than the particle size of the fracturing sand. The through holes of the multiple felt pads 6 in the upper cleaning layer, the through holes of the rubber pads 8, the sewage guide holes 901, the inner hole 102, and the through holes on the upper copper pads 5 and the lower copper pads 7 form a channel for the steel wire to pass through. The relatively closed lubrication oil storage system composed of the pressure cylinder 11, the felt pads 6, the oil cup 13 and the rubber pads 8 ensures that all gaskets, lifting and lowering steel wires and dynamic sealing packings in the inner cavity of the body 1 are fully lubricated.

[0039] In this embodiment, the side wall of the pressing cylinder 11 is provided with a plurality of leakage holes along its axial direction, and there is a gap between the pressing cylinder 11 and the installation cavity. A first injection port 2 is connected to the side of the main body 1, and the first injection port 2 is in communication with the pressing cylinder 11. Specifically, the main body 1 is provided with a first vertical hole vertically leading to the oil cup 13 and a first transverse hole transversely leading to the pressing cylinder 11, the first transverse hole is in communication with the first vertical hole, and the first injection port 2 is in communication with the first transverse hole. Lubricating oil is injected through the first injection port 2, and the lubricating oil can enter the gap between the pressing cylinder 11 and the installation cavity through the first transverse hole, and enter the interior of the pressing cylinder 11 from the leakage holes on the side wall of the pressing cylinder 11 and soak into the oil felt pad 6, so as to provide lubricating oil for the steel wire.

[0040] In this embodiment, a second injection port 3 is further provided on one side of the main body 1. The second injection port 3 and the first injection port 2 are respectively located on both sides of the main body 1. A second vertical hole arranged vertically and a second transverse hole arranged transversely are opened on the main body 1. The second transverse hole is communicated with the second vertical hole, and the two ends of the second vertical hole are respectively communicated with the oil cup 13 and the lower chamber of the main body 1. A wire plug 4 for blocking the hole is provided at the top of the second vertical hole.

[0041] The second injection port 3 can be injected with chemical substances or unblocking agents, and a large amount of chemical substances can be injected into the borehole of the lower body 1 to help remove the blockage caused by dirt in the well.

[0042] Under normal circumstances, the wire plug 4 blocks the orifice at the top of the second vertical hole, and the second injection port 3 can be used to inject antifreeze and thawing chemicals such as methanol or ethylene glycol or corrosion inhibitors by pumping in a large volume, and directly inject them into the wellbore of the blowout preventer of the lower component through the second vertical hole channel pointing vertically downward in the channel; and if an extreme situation occurs and it is necessary to clean the upper part of the main body 1 and the blowout preventer box, the bottom end of the second vertical hole can be blocked and the wire plug 4 at the top of the second vertical hole can be removed, and the chemical substances can be injected upward through the second injection port 3 to unblock the components inside the blowout preventer box. This can cope with different situations and has a wide range of applications.

[0043] The first injection port 2 and the second injection port 3 can ensure that during normal on-site operations, there will be no high-temperature cavitation of the steel wire due to too fast lifting and lowering speed, too long stroke, or dirt on the steel wire, or the need to thaw, de-ice, clean the attachments on the steel wire such as fracturing sand, or quickly and conveniently inject the corresponding chemicals and lubricating oil during special operations.

[0044] To increase the safety of construction operations, two one-way valves 12 with independent functions and connected in series are arranged in the joints of the first injection port 2 and the second injection port 3. When injecting chemicals into the well in the forward direction, if the pressure of the injected chemicals is higher than the well pressure, the two one-way valves 12 are opened by the high-pressure chemicals at the same time, and the chemicals are smoothly injected into the well; if the pressure of the injected chemicals is lower than the well pressure, the first one-way valve 12 in contact with the fluid in the well is sealed by the well pressure, and the chemicals cannot be injected into the well, and the high-pressure gas in the well will not enter the injection pipeline.

[0045] When no chemical substances are injected into the well, the high-pressure gas in the well will not enter the injection pipeline either. In the process of one-way sealing well pressure, the first one-way valve 12 in contact with the well pressure plays the main sealing role, and the second one-way valve 12 behind plays the backup role. Once the one-way valve 12 in contact with the well pressure leaks or loses its seal, the backup one-way valve 12 automatically seals the well pressure to prevent the high-pressure gas in the well from entering the injection pipeline, playing a double insurance role in safe operation and greatly improving construction safety.

[0046] Of the two injection ports, one can meet the requirement of injecting chemical substances required for the operation process into the blowout preventer, the wellhead or the wellbore in large volume, and the other can inject chemical substances such as lubricating oil, cleaning agent or solvent in small volume and be effectively stored in the oil storage space. Double check valves 12 are arranged in series in the two injection port interfaces to ensure that the gas in the well will not flow into the injection pipeline due to problems with the check valve 12 during the operation, thereby improving the safety of the construction operation.

[0047] The specific implementation process is as follows: In this embodiment, a wireline operation anti-jamming agent injection device is provided, wherein the blowout box connection section 14 and the blowout pipe connection section 15 are connected between the wireline blowout box (top seal) and the blowout pipe string by a union, wherein two injection ports are provided on the upper side wall, and a check valve 12 is installed in the external connection joint of the two injection ports, so that the external high-pressure unblocking agent / chemical substance / lubricating oil can be injected by the injection pump, while the internal well fluid cannot leak out. An anti-jamming unit suitable for long-distance wire cleaning is installed inside its body 1.

[0048] There are three layers of cocoon-type cleaning channels (gates) in the anti-jamming unit. The multi-stage wire cleaning channel design eliminates the shortcoming of the traditional one-stage wire cleaning channel that cannot clean the wire over a long distance.

[0049] The first layer is a lower cleaning layer composed of a perforated copper pad 10 and a contamination-guiding copper pad 9: there is a very small gap between the inner hole 102 of the perforated copper pad 10 and the steel wire, which is smaller than the particle size of the fracturing sand. Granular hard dirt (such as fracturing sand) or hydrate dirt attached to the lifting steel wire can be scraped off by the hole and flow back into the well through the contamination-guiding copper pad 9 and the flow-guiding hole 101 in the perforated copper pad 10, which solves the problem of large dirt such as fracturing sand accumulating in the felt and causing new obstruction; The second layer is a middle cleaning layer composed of a rubber pad 8, the through hole of the rubber pad 8 is interference fit with the steel wire, and can scrape off the small granular hard dirt (such as fracturing sand) or hydrate dirt attached to the surface of the steel wire that is not scraped off by the lower cleaning layer; The third layer is an upper cleaning layer composed of multiple felt pads 6. The through holes of the felt pads 6 are also interference fit with the steel wire. The lubricating oil adsorbed on the felt pads 6 has both lubricating and cleaning effects on the steel wire. In this embodiment, chemical substances can also be injected through the first injection port 2 to remove blockage.

[0050] In this embodiment, the dirt is cleaned in descending order according to its volume. The first step is to block the larger dirt such as fracturing sand, then remove the smaller dirt, and finally deep clean and lubricate the steel wire. At the same time, the dirt removed is introduced into the well in time through the dirt guide component (perforated copper pad 10 and dirt guide copper pad 9); and in this embodiment, an injection port is respectively arranged on both sides of the body 1, and the plugging remover and lubricant injection valves are respectively designed on both sides of the body 1, and the lubricant and plugging remover injection valves are respectively designed on both sides of the body 1, and two independent functions and series connection are arranged in the two injection port joints. The one-way valve 12 of the spare one-way valve 12, once the one-way valve 12 in contact with the well pressure leaks or loses its seal, the spare one-way valve 12 automatically seals the well pressure to prevent the high-pressure gas in the well from entering the injection pipeline, playing a double insurance role in safe operation and greatly improving the safety of construction; finally, the plugging remover and lubricant are injected into the main body 1 through a relatively independent dual-channel design to achieve the conditions for injecting the plugging remover and lubricant at the same time, while in the prior art, an injection port is usually set on one side, and the lubricant and the plugging remover are injected through one injection port, and they need to be injected separately, and cannot be injected at the same time, and the injection efficiency is slow. And one injection port cannot meet the injection of a large dose of plugging remover.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wire operation anti-jamming agent injection device, characterized in that: It comprises a body and an anti-jamming unit, wherein the upper end and the lower end of the body are respectively connected to the blowout prevention box and the blowout prevention pipe, an installation cavity is provided inside the body, and the anti-jamming unit is located in the installation cavity of the body; The anti-jamming unit comprises a pressing cylinder, an upper cleaning layer and a lower cleaning layer, the interior of the pressing cylinder is hollow, the upper cleaning layer is located inside the pressing cylinder, and the lower cleaning layer is located at the bottom of the pressing cylinder; The lower cleaning layer comprises a coaxially arranged perforated copper pad and a pollution-guiding copper pad, the perforated copper pad is provided with an inner hole and a plurality of flow-guiding holes, the inner hole is located at the center of the perforated copper pad, the plurality of flow-guiding holes are circumferentially distributed on the end surface of the perforated copper pad, the pollution-guiding copper pad is located above the perforated copper pad, and the pollution-guiding copper pad is coaxially provided with a pollution-guiding hole; there is a gap between the inner hole and the steel wire, and the gap between the inner hole and the steel wire is smaller than the particle size of the fracturing sand; the upper cleaning layer and the top of the pressure cylinder are both coaxially provided with through holes, and the through holes of the upper cleaning layer are interference-fitted with the steel wire; A first injection port is connected to the side surface of the body, and the first injection port is communicated with the pressing cylinder.

2. A wire operation anti-jamming agent injection device according to claim 1, characterized in that: The upper cleaning layer comprises a plurality of linoleum pads which are coaxially arranged and overlapped in sequence.

3. The anti-jamming agent injection device for wire work according to claim 1, characterized in that: The anti-jamming unit also includes a middle cleaning layer, and the middle cleaning layer is located between the upper cleaning layer and the lower cleaning layer, and a through hole is also opened in the center of the middle cleaning layer.

4. The anti-jamming agent injection device for wire work according to claim 3, characterized in that: The middle cleaning layer is a rubber pad.

5. A wire work anti-jamming agent injection device according to any one of claims 1 to 4, characterized in that: The top and bottom ends of the upper cleaning layer are respectively provided with an upper copper pad and a lower copper pad, wherein the upper copper pad is located on the top wall of the pressing cylinder, and the lower copper pad is located on the bottom end of the pressing cylinder and abuts against the side wall of the mounting cavity of the body.

6. The anti-jamming agent injection device for wire work according to claim 1, characterized in that: The top end of the copper pad with holes is an arc-shaped concave surface.

7. The anti-jamming agent injection device for wire work according to claim 1, characterized in that: An oil cup is arranged on the upper part of the main body and above the anti-jamming unit.

8. The anti-jamming agent injection device for wire work according to claim 7, characterized in that: The main body is provided with a first vertical hole vertically leading to the oil cup and a first transverse hole transversely leading to the pressure cylinder, the first transverse hole is communicated with the first vertical hole, and the first injection port is communicated with the first transverse hole.

9. The anti-jamming agent injection device for wire work according to claim 8, characterized in that: A second injection port is also provided on one side of the main body, and the second injection port and the first injection port are respectively located on both sides of the main body. A second vertical hole arranged vertically and a second transverse hole arranged transversely are opened on the main body, and the second transverse hole is communicated with the second vertical hole, and the two ends of the second vertical hole are respectively communicated with the oil cup and the main body, and a wire plug for blocking the hole opening of the second vertical hole is provided at the top end of the second vertical hole.

10. The anti-jamming agent injection device for wire work according to claim 1, characterized in that: The side wall of the pressure cylinder is provided with a plurality of leakage holes along its axial direction, and a gap is provided between the pressure cylinder and the installation cavity.

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