The utility model content
In order to overcome existing packer when the special hole condition completion practice such as horizontal well, the deficiency that packer accessory is easily damaged by erosion, the utility model provides a kind of perfusion packer.This perfusion packer damages packer accessory when having avoided big discharge capacity to pour into by the packer accessory protective device, reduces construction risk, guarantees for the completion engineering provides robust techniques.
The technical scheme that its technical problem that solves the utility model adopts is: the perfusion packer comprises top connection, central tube, lower contact, packing assembly, sets assembly, deblocking shear pin, filler ring, top connection, central tube, lower contact from top to bottom are fixedly connected sequentially, the packing assembly is installed in the central tube middle part, the filler ring of packing assembly top is fixedlyed connected with central tube, sets the below that assembly is installed in the packing assembly.On the central tube of filler ring top the sheath assembly is installed, the sheath assembly behind the constraint relief upwards slides along the central tube body.The sheath assembly comprises protective sleeve, piston, control piston, lock dog, shear pin; The control piston cylindrical is up big and down small multidiameter, and the control piston lower end part is in the endoporus of piston upper end, and piston is fixedlyed connected by the shear pin of radially installing with control piston; Gapped between the lower surface of piston and the filler ring upper surface; Lock dog is installed in the cannelure of the radially lock dog groove of control piston bottom and correspondence position central tube; Lock dog is arranged in the endoporus of piston upper end; Control piston is fixedlyed connected with the protective sleeve upper end, and the bottom of control piston, piston, packing assembly are positioned at protective sleeve.Central tube installation sheath assembly place has radially goes up pressure transmission hole, and the central tube installation sets the assembly place footpath pressure transmission hole downwards.The shear pin shear strength that connects piston and control piston is less than the shear strength that sets shear pin.The packing assembly comprises packer accessory, spacer ring, packer accessory, and from top to bottom installs.The sheath assembly is equal to or greater than the length of packing assembly along the central tube sliding distance that makes progress; Gap between the lower surface of piston and the filler ring upper surface is more than or equal to the height of lock dog.The last pressure transmission hole of central tube is positioned at the cannelure place that lock dog is installed.When the protective sleeve of sheath assembly was in non-guard mode, last pressure transmission hole was positioned at the top of piston.
The beneficial effects of the utility model are, and are simple and reasonable, and easy operating is safe and reliable, guarantee for the completion engineering safety provides reliable technique, improve construction operation efficient.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.But what those skilled in the art should know is to the invention is not restricted to the listed specific embodiment, as long as spirit according to the invention all should be included in protection scope of the present invention.
Referring to accompanying drawing 1, the structural representation of the utility model perfusion packer confined state.The utility model perfusion packer comprises central tube 2, top connection 1, lower contact 17, sheath assembly 19, packing assembly 20, sets assembly 22, deblocking shear pin 13, filler ring 8, and top connection 1, central tube 2, lower contact 17 from top to bottom are fixedly connected sequentially; Packing assembly 20 is installed in the middle part of central tube 2, and packing assembly 20 generally includes packer accessory 9, spacer ring 10, packer accessory 9, and from top to bottom installs.The filler ring 8 of packing assembly 20 tops is fixedlyed connected with central tube 2, adopts the technology that is threaded usually.Set assembly 22 and be installed in the below of packing assembly 20.
On central tube 2 bodys of filler ring 8 tops of the utility model perfusion packer sheath assembly 19 is installed, the sheath assembly 19 behind the constraint relief upwards slides along central tube 2 bodys.Sheath assembly 19 should be equal to or greater than the length of packing assembly 20 along the central tube 2 bodys sliding distance that makes progress.
Sheath assembly 19 comprises control piston 3, protective sleeve 4, lock dog 5, shear pin 6, piston 7.The cylindrical of control piston 3 is up big and down small multidiameter, and control piston 3 lower end parts are in piston 7 upper end endoporus, and piston 7 is fixedlyed connected by the shear pin of radially installing 6 with control piston 3.The shear strength of the shear pin 6 of connection piston 7 and control piston 3 is less than the shear strength that sets shear pin 16 that sets in the assembly 22.
Lock dog 5 is installed in the cannelure of the radially lock dog groove of control piston 3 bottoms and correspondence position central tube 2; Lock dog 5 is arranged in the endoporus of piston 7 upper ends.Control piston 3 is fixedlyed connected with protective sleeve 4 upper ends, and the bottom of control piston 3, piston 7, packing assembly 20 are positioned at protective sleeve 4.Gapped between the lower surface of piston 7 and filler ring 8 upper surfaces, its gap is more than or equal to the height of lock dog 5.
Central tube 2 installation sheath assemblies 19 places have radially goes up pressure transmission hole 18, and the last pressure transmission hole 18 of central tube 2 is positioned at the cannelure place that lock dog 5 is installed usually.When the protective sleeve 4 of sheath assembly 19 was in non-guard mode, last pressure transmission hole 18 was positioned at the top of piston 7.
The assembly 22 that sets in the utility model perfusion packer adopts the hydraulic setting locking mechanism.Setting assembly 22 comprises upper piston 11, lower piston 12, control cover 15, divides claw 14, upper piston 11, lower piston 12, divide claw 14 to be installed in successively on central tube 2 excircles from top to bottom, upper piston 11 and lower piston 12 are in central tube 2 lower ends not between boss and packing assembly 20 lower surfaces; Upper piston 11 is fixedlyed connected with control cover 15, and lower piston 12, branch claw 14 are positioned at control cover 15.Dividing claw 14 bottoms is special pawl screw thread, and control cover 15 endoporus divide claw 14 bottoms to have and the special pawl screw thread that divides claw 14 to be complementary.That radially installs sets shear pin 16 and will control and overlap 15 and fixedly connected with lower contact 17; Divide between claw 14 lower ends and lower contact 17 upper surfaces gapped, this gap can set after shear pin 16 cut off, upper piston 11 drives control cover 15 and moves up, special pawl screw thread of control cover 15 endoporus and the special pawl threaded engagement in branch claw 14 bottoms prevent that control cover 15 from moving down.Radially the deblocking shear pin 13 of An Zhuaning will divide claw 14 to fixedly connected with central tube 2.Following pressure transmission hole 21 is radially arranged on the central tube 2 at upper piston 11 places.
The assembly 22 that sets in the utility model perfusion packer adopts the hydraulic setting locking mechanism, but be not limited thereto, also can be other forms of the prior art, as: single, doublely set locking mechanism to fixed hydraulic, single, doublely set structure, or do not have stationary machine and set structure etc. to stationary machine.
The packing assembly 20 that is adopted in the utility model is not limited only to embodiment cited in this manual, also can comprise other forms of packing assembly.
It is as follows to adopt the utility model perfusion packer to implement well cementation packing operation process:
At first, according to technological design the utility model is poured into packer (as shown in Figure 1) and be connected, be lowered in the pit shaft with tubing string and kit; Build the pressure in the tubing string, high pressure liquid stream is through last pressure transmission hole 18, following pressure transmission hole 21, when pressure reaches shear pin 6 and cuts off design load, the shear pin 6 that connects piston and control piston 4 cut off.After shear pin 6 was cut off, piston 4 to lower slider, was removed the constraint to lock dog 5 along central tube 2; Under the effect of pressure; the cannelure that lock dog 5 ejects on the central tube 2, control piston 3 drives protective sleeve 4 and is moved upward to top connection 1 place, and packing assembly 20 is exposed (as shown in Figure 2) fully; when the protective sleeve 4 of sheath assembly 19 was in non-guard mode, last pressure transmission hole 18 was positioned at the top of piston 7.
Then, tubing string boosts to and sets shear pin 16 when cutting off design load, connects the control cover 15 that sets assembly 22 and the shear pin 16 that sets of lower contact 17 and is cut off, and upper piston 11, control cover 15 are along the central tube 2 compression packer accessory 9 that moves up, packer accessory 9 is radially increased, until being adjacent to shaft in wall; The special pawl screw thread of control cover 15 endoporus is an one with dividing the special pawl screw fastening in claw 14 lower ends simultaneously, and packer accessory 9 not resiliences after the tubing string release reach the purpose of packing annular space, can completion goes into operation by (referring to accompanying drawing 3).
If tubing string is hampered or produces when needing deblocking, the upper lifting pipe post is cut off to connect and is divided the deblocking shear pin 13 of claw 14 with central tube 2, gets final product deblocking, smoothly packer and tubing string is proposed pit shaft.
The utility model perfusion packer is compared with conventional packer, has increased sheath assembly 20, guarantees to pour into packer in the process of going into the well, and makes any relative displacement does not take place between each parts.Cut off shear pin 6 when setting and open control lock under the effect of hydraulic coupling, the protective sleeve 4 up packing assemblies 20 that make break away from protection; Improve pressure again, cut off and set shear pin 13, upper piston 11 up compression packer accessory 9 sealing annular spaces; The upper lifting pipe post is cut off deblocking shear pin 13, can smoothly packer and tubing string be proposed pit shaft.The utility model perfusion packer is suitable for hole deviation≤90 °, guarantees that big hole deviation to the completion practice construction of horizontal well carries out smoothly, effectively improves job success ratio.
It should be noted that the foregoing description is example and unrestricted the present invention, those skilled in the art can design a lot of alternate embodiments and not break away from the claim scope of this patent.