Secondary fastening and sealing safety device of rope blowout prevention box
By designing a combined structure of the anchoring cylinder and the oil cup pressure rod in the blowout box, the problem of oil and gas leakage caused by excessive loosening of the existing blowout box sealing pack is solved, and higher well control safety and sealing effect are achieved.
Patent Information
- Application Number
- CN202311539008.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-17
- Publication Date
- 2025-05-20
AI Technical Summary
The existing anti-blow-proof box sealing pack is squeezed and sealed by only one oil cup thread. It is easy to loosen too much, causing the oil and gas flow to push the oil cup out and lose the tightening point, and the oil and gas flow are directly pushed out of the blowout box, resulting in leakage of the oil and gas flow at the wellhead, causing the risk of well control and fire explosion.
A secondary tightening and sealing safety device for anti-blasting box of ropes is designed. By installing an anchor barrel in the main body of the anti-blasting box, an oil cup pressure rod is installed inside the anchor barrel. A threading hole is provided in the middle of the oil cup pressure rod, and a pack is provided between the support table and the oil cup pressure rod. The anchor barrel blocks the pack. When the single-phase oil cup pressure rod is too loose or ejected, the anchor barrel blocks the pack to prevent oil and gas flow from ejecting the pack.
It effectively avoids oil and gas leakage caused by the ejection of the pack, greatly increases the safety of well control, and ensures that the wellhead seal is tight and has no leakage.
Smart Images
Figure CN120020320A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of blowout preventer boxes, and is a secondary fastening and sealing insurance device for cable blowout preventer boxes. Background Art
[0002] During oilfield exploration and development, formation testing operations require the use of cable tools to cooperate with instruments to quickly obtain formation parameters. Since the pressure of most wells decreases due to production decline, the use of high-pressure pressure-bearing blowout preventer equipment is too costly and the installation is cumbersome, delaying the operation efficiency. In the low-pressure formation testing technologies of major domestic oilfields, simple blowout preventer devices that are quick to install and low in cost are generally used. The sealing packing of the existing blowout preventer box is only sealed by squeezing with a single oil cup thread. When the oil and gas flow is relatively large, the weight of the tool string cannot overcome the upward force of the oil and gas flow, and it is necessary to loosen the oil cup thread in the reverse direction to relax the tightening force of the packing so that the tool can be lowered. However, the tightening method of the thread seal type cannot accurately loosen the number of turns, and it is easy to loosen too much, resulting in the oil and gas flow ejecting the oil cup and the packing losing the fastening point and being directly ejected from the blowout preventer box by the oil and gas flow, resulting in the leakage of the wellhead oil and gas flow and triggering well control and fire and explosion hazards. Summary of the Invention
[0003] The present invention provides a secondary fastening and sealing insurance device for cable blowout preventer boxes, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem that the sealing packing of the existing blowout preventer box is only sealed by squeezing with a single oil cup thread, resulting in too much loosening and the packing being ejected, causing oil and gas leakage.
[0004] The technical solution of the present invention is achieved by the following measures: A secondary fastening and sealing insurance device for cable blowout preventer boxes includes a blowout preventer box body, an anchor cylinder, and an oil cup pressure rod. An anchor cylinder is installed inside the blowout preventer box body, the anchor cylinder can block the packing, an oil cup pressure rod is installed inside the anchor cylinder, a wire passing hole penetrating up and down is provided in the middle of the oil cup pressure rod, a support platform is integrally provided inside the blowout preventer box, and a packing is provided between the support platform and the oil cup pressure rod.
[0005] The following is a further optimization and / or improvement of the above-mentioned technical solution of the invention: The outer side of the lower part of the above-mentioned anchor cylinder is threadedly connected to the inner side of the blowout preventer box body, and the inner side of the anchor cylinder is threadedly connected to the outer side of the lower part of the oil cup pressure rod.
[0006] An installation ring groove may be provided on the outer side of the lower end of the above-mentioned oil cup pressure rod, and a retaining table is provided on the inner side of the anchor cylinder corresponding to the position of the installation ring groove, and the inner diameter of the retaining table is smaller than the outer diameter of the packing.
[0007] The above-mentioned anchor cylinder may be cross-shaped, a sealing ring is provided between the upper end inner side of the blowout preventer box body and the anchor cylinder, and two sealing rings are provided at intervals up and down on the outer side of the blowout preventer box body.
[0008] The above may further include copper rings, and copper rings are provided on both the upper side and the lower side of the packing.
[0009] The structure of the present invention is reasonable and compact, and it is convenient to use. By arranging an anchoring cylinder to block the packing, the problem that the packing is pushed out by oil and gas, resulting in oil and gas leakage, is avoided when the packing loses the pressing of the oil cup pressure rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Appendix Figure 1 is a schematic front half-sectional view of an embodiment of the present invention.
[0011] The codes in the drawings are respectively: 1 is the blowout preventer box body, 2 is the anchoring cylinder, 3 is the oil cup pressure rod, 4 is the support platform, 5 is the packing, 6 is the retaining platform, 7 is the wire threading hole, 8 is the sealing ring, and 9 is the copper ring. DETAILED DESCRIPTION OF THE INVENTION
[0012] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solution of the present invention and the actual situation.
[0013] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the drawings in the specification. For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the drawings in the specification. Figure 1 The following is a further description of the present invention in combination with the embodiments and the drawings:
[0014] The following describes the present invention in further detail in conjunction with the embodiments and the drawings: Embodiment 1: As shown in the appendix Figure 1 The secondary fastening and sealing insurance device for the cable blowout preventer box includes a blowout preventer box body 1, an anchoring cylinder 2, and an oil cup pressure rod 3. The anchoring cylinder 2 is installed in the blowout preventer box body 1. The anchoring cylinder 2 can block the packing 5. The oil cup pressure rod 3 is installed inside the anchoring cylinder 2. A wire threading hole 7 that penetrates up and down is provided in the middle of the oil cup pressure rod 3. A support platform 4 is integrally provided inside the blowout preventer. A packing 5 is provided between the support platform 4 and the oil cup pressure rod 3.
[0015] During use, when the oil and gas flow is large, the weight of the tool string cannot overcome the upward pushing force of the oil and gas flow, and the thread of the oil cup pressure rod 3 is loosened in the reverse direction to relax the tightening force of the packing 5 so that the tool can be lowered. When the oil cup pressure rod 3 is loosened too much in one direction or the oil cup pressure rod 3 is pushed out, the anchoring cylinder 2 is connected to the blowout preventer box body 1. The anchoring cylinder 2 can block the packing 5. During the ground test, the oil cup pressure rod 3 is not installed and pressurized to 35 MPa. The anchoring cylinder 2 device takes effect, the packing 5 has no displacement and is tightly sealed without leakage, solving the problem of oil and gas leakage caused by the packing 5 being pushed out, and greatly increasing the well control safety.
[0016] According to actual needs, the above secondary fastening and sealing insurance device for the cable blowout preventer box can be further optimized or / and improved: Embodiment 2: As shown in the appendix Figure 1As shown, the outer side of the lower part of the anchoring cylinder 2 is threadedly connected to the inner side of the blowout preventer box body 1, and the inner side of the anchoring cylinder 2 is threadedly connected to the outer side of the lower part of the oil cup pressure rod 3.
[0017] The anchoring cylinder 2 and the blowout preventer box body 1 are connected by threads, which is convenient for installation and disassembly, and can also facilitate the adjustment of the position of the anchoring cylinder 2.
[0018] Embodiment 3: As shown in the appendix Figure 1 As shown, an installation ring groove is provided on the outer side of the lower end of the oil cup pressure rod 3, and a retaining table 6 is provided on the inner side of the anchoring cylinder 2 corresponding to the position of the installation ring groove. The inner diameter of the retaining table 6 is smaller than the outer diameter of the packing 5.
[0019] On the basis of pressing the packing 5 on the lower side of the oil cup pressure rod 3, the retaining table 6 is provided. When the oil cup pressure rod 3 cannot press the packing 5 and the underground oil and gas push up, the packing 5 will move up and top against the lower side of the retaining table 6. Therefore, even if the oil cup pressure rod 3 is pushed out, the packing 5 will be blocked by the retaining table 6 and continue to seal the wellhead, so that the packing 5 will not come out and cause oil and gas leakage.
[0020] Embodiment 4: As shown in the appendix Figure 1 As shown, the anchoring cylinder 2 is cross-shaped, and a sealing ring 8 is provided between the inner side of the upper end of the blowout preventer box body 1 and the anchoring cylinder 2. Two sealing rings 8 are provided at intervals up and down on the outer side of the blowout preventer box body 1.
[0021] The cross-shaped anchoring cylinder 2 has its outer end located above the blowout preventer box body 1 during installation, which can limit the installation position of the anchoring cylinder 2 and prevent it from being installed downward excessively and squeezing the packing 5, resulting in the failure of the oil cup pressure rod 3 to adjust the pressing degree of the packing 5. By setting the sealing ring 8, the sealing performance is increased to avoid oil and gas leakage.
[0022] Embodiment 5: As shown in the appendix Figure 1 As shown, it further includes a copper ring 9, and copper rings 9 are provided on both the upper side and the lower side of the packing 5. By setting the copper ring 9, the packing 5 can be supported and centered.
[0023] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims
1. A secondary fastening and sealing safety device for a rope and cable blowout prevention box, characterized in that It includes a blowout preventer box body, an anchoring tube, and an oil cup pressure rod. The anchoring tube is installed in the blowout preventer box body, which can block the packing. The oil cup pressure rod is installed inside the anchoring tube. The middle part of the oil cup pressure rod is provided with a threading hole that passes through from top to bottom. A support platform is integrated inside the blowout preventer box, and a packing is provided between the support platform and the oil cup pressure rod.
2. The secondary fastening and sealing safety device for a cable blowout prevention box according to claim 1 is characterized in that The outer side of the lower part of the anchor tube is connected with the inner side of the blowout preventer box body by threads, and the inner side of the anchor tube is connected with the outer side of the lower part of the oil cup pressure rod by threads.
3. The secondary fastening and sealing safety device for a cable spray prevention box according to claim 1 or 2, characterized in that An installation ring groove is arranged on the outer side of the lower end of the oil cup pressure rod, and a stopper is arranged on the inner side of the anchor tube corresponding to the installation ring groove position, and the inner diameter of the stopper is smaller than the outer diameter of the packing.
4. The secondary fastening and sealing safety device for a cable blowout prevention box according to claim 1 or 2, characterized in that The anchoring tube is cross-shaped, a sealing ring is arranged between the inner side of the upper end of the blowout preventer box body and the anchoring tube, and two sealing rings are arranged at intervals at upper and lower sides of the outer side of the blowout preventer box body.
5. The secondary fastening and sealing safety device for a cable blowout prevention box according to claim 3 is characterized in that The anchoring tube is cross-shaped, a sealing ring is arranged between the inner side of the upper end of the blowout preventer box body and the anchoring tube, and two sealing rings are arranged at intervals at upper and lower sides of the outer side of the blowout preventer box body.
6. The secondary fastening and sealing safety device for a cable spray prevention box according to claim 1, 2 or 5, characterized in that It also includes copper rings, which are arranged on the upper and lower sides of the packing.
7. The secondary fastening and sealing safety device for a cable blowout prevention box according to claim 3 is characterized in that It also includes copper rings, which are arranged on the upper and lower sides of the packing.
8. The secondary fastening and sealing safety device for a cable blowout prevention box according to claim 4 is characterized in that It also includes copper rings, which are arranged on the upper and lower sides of the packing.