Method for fishing fishes buried by silt and fishing spear of method

Technical Field

The invention relates to a salvage is silt buried fish method and its spear, which belongs to the technical field of technical.

Background Art

In oil and gas field drilling, workover the accident of the fracture of the tool often occurs, often need to use special fishing tool will fall into the bottom of the column (commonly known as fish) fishing a well outlet. LM-T-shaped tile fishing spear is one kind of fishing tool, its working principle is to utilize kave elastic (can be shrinkable) extends into the fish to firmly clamp the inner hole, and then pulling the fishing operation. Existing kave fishing spear can only complete clamping and fishing operation, mud circulating at the bottom of the can not be carried out. For some delay of a long time as well, and at the bottom of the precipitation of rock sand live fish will be buried, would greatly increase the load of the hollow, a serious impact on fish fishing success rate.

Content of the invention

The aim of the invention is to, provide a salvage is silt buried fish spear and method of, the invention, through increasing the sealing arrangement makes the LM-T in the fishing spear-shaped tile can fish to the inner, outer annular slurry circulation, flushing to ensure the fish in the optimum salvaging state, improving the mission success rate for fishing, save the cost of salvage, so as to overcome the deficiency of the prior art.

The technical scheme of the present invention:

A salvage of the present invention, easy method to bury the fish, the method is in the well through the drill pipe to inject into the high-pressure water, high-pressure water through the spout on the fiber, will cover up the mud and sand on the buried fish , the high-pressure water ejected from the drill rod and the gap between the with the wall on the well is discharged; in eroding the silt with drill rod of the mandrel at the same time slowly drop, broken in the bottom of the well and is inserted into the inner hole of the fish; and then the mandrel is driven to rotate the drill pipe, the, conical surface on the through the mandrel threaded slip on forcing the mandrel to expand outwards clamp the fish, then drill rod rise, the fish salvaged from the well.

In the aforesaid method, the sealing joint body states directs the awl is connected with the upper end of the, sealing joint body is provided with a sealing member; the sealing body is closed through the inner hole of the fish forcing high-pressure water can only be along the fish to the outer wall of the well head flow, reducing the resistance at the time of the rising fish.

In the aforesaid method, the fishing tool guiding states directs the awl smoothly enter the fish, a standard fiber and fiber rubs the mill to direct the awl two, standard rules for able to smooth the mouth of the fish, rubs the mill to direct the awl is provided with a grinding head, used for the mouth is provided with a flanging, flash, deformation fish, through grinding head able to influence the primary syphilis part 7 into the flanging, flash, clean up the deformation.

In the aforesaid method, the slip is provided with saw tooth screw thread on the mandrel with the conical surface of the conical surface of the sawtooth threads, kave conical surfaces of the is provided with a saw tooth screw thread group leader trough , when rotating, is hoisted, the conical surface of the saw tooth screw thread on the mandrel to produce elastic deformation of the bottom of the slip to expand outwards, clamp the fish; kave the lower is provided with a release ring, when the fishing unsuccessful or successful when the fish needs to be released, the downward push of the, reverse rotation of the mandrel, the release ring forcing card kawara restitution to shrink inwards releasing fish.

The present invention for the above-mentioned method of salvaging the spear is , the fishing spear includes from upper to lower the mandrel are sequentially in threaded connection, joint type nut, sealing joint body and the fiber; the mandrel is coated with slip and the release ring; sealing joint body is provided with a sealing member.

In the spear, the mandrel is arranged at the upper end of the inner cone is connected with the drill pipe thread, the middle part of the threaded spindle is provided with a conical surface, the lower end of the mandrel is provided with the external thread of the connection of sealing assembly.

In the spear, and the mandrel is set in the slip 1 of the conical surface on the conical surface of the saw tooth is matched with outer screw threads of the internal thread, the internal thread on the conical surface of the is provided with a group of notches.

In the spear, the seal assembly includes from upper to lower threaded connection in turn able to the sealing joint body and, sealing the joint body is provided with a seal between the fiber.

In the spear, states directs the awl of the guide surface is a surface or cutting surface, and is arranged on the surface of the hard alloy rubs the mill bank or ridge between fields of the pinch rollers.

Compared with the prior art, the present invention can effectively solve the landfill is fish against cannot be salvaged, thereby greatly improving LM-T-shaped tile fishing spear fishing success rate; fishing at the same time can effectively maintain the clean bottom of the well, the oil, gas well exploitation, the rejection rate of when exploration ; reduce the production, the cost of exploration.

Description of drawings

Figure 1 is a schematic diagram of operation of the invention;

Figure 2 is a structure diagram of the invention;

Figure 3 is a structure diagram of the mandrel;

Figure 4 is a structure diagram of kave.

In the Figure the mark is:1-the mandrel, 2-kave, 3-release ring, 4-joint type nut, 5-sealing joint body, 6-sealing member, 7-fiber, 8-inner taper thread, 9-conical surface sawtooth external thread, 10-an external screw thread, 11-conical surface sawtooth internal thread, 12-notch, 13-of the pinch rollers, 14-hard alloy rubs the mill bank or ridge between fields , 15-wall, 16-fish.

Mode of execution

With this invention the Figure below further in detail, but not as any limitation of this invention.

A salvage is silt method of buried fish, as shown in Figure 1, the method is in the well through the drill pipe to inject into the high-pressure water, high-pressure water through the spout on the fiber, will cover up the mud and sand on the buried fish , the high-pressure water ejected from the drill rod and the well wall and the gap between the wellhead is discharged; in eroding the silt with drill rod of the mandrel at the same time slowly drop, broken in the bottom of the well and is inserted into the inner hole of the fish; and then the mandrel is driven to rotate the drill pipe, the, conical surface on the through the mandrel threaded slip on forcing the mandrel to expand outwards clamp the fish, then drill rod rise, the fish salvaged from the well. Fiber with the sealing joint body is connected with the upper end of the, sealing joint body is provided with a sealing member; the sealing body is closed through the inner hole of the fish forcing high-pressure water can only be along the fish to the outer wall of the well head flow, reducing the resistance at the time of the rising fish. Guide fishing tool able to smoothly enter the fish, a standard fiber and fiber rubs the mill to direct the awl two, standard rules for able to smooth the mouth of the fish, rubs the mill to direct the awl is provided with a grinding head, used for the mouth is provided with a flanging, flash, deformation fish, through grinding head able to influence the primary syphilis part 7 into the flanging, flash, clean up the deformation. Kave is provided with saw tooth screw thread on the mandrel with the conical surface of the conical surface of the sawtooth threads, kave conical surfaces of the is provided with a saw tooth screw thread group leader trough , when shaft is rotated, the conical surface of the saw tooth screw thread on the mandrel to produce elastic deformation of the bottom of the slip to expand outwards, clamp the fish; kave the lower is provided with a release ring, when the fishing unsuccessful or successful when the fish needs to be released, the downward push of the, reverse rotation of the mandrel, the release ring forcing card kawara restitution to shrink inwards releasing fish.

Used in the above-mentioned method of the present invention a structure diagram of a fishing spear of Figure 2-Figure 4 shows, the fishing spear includes from upper to lower the mandrel are sequentially in threaded connection 1, joint type nut 4, sealing joint body 5 and fiber 7 ; the mandrel 1 is sleeved with a kave 2 and release the ring 3 ; the sealing joint body 5 is provided with a sealing member 6. As shown in Figure 3, the spindle 1 is arranged at the upper end of the inner cone is connected with the drill pipe thread 8, the mandrel 1 is provided with a conical surface in the middle sawtooth threads 9, the mandrel 1 and is connected with the lower end of the external screw thread of the sealing assembly 10. As shown in Figure 4, card tile 2 and the mandrel is set in the 1 conical surfaces of the sawtooth outer screw thread 9 with sawtooth the conical surface of the internal thread 11, conical surface sawtooth internal thread 11 is provided with a group of notches 12. The sealing assembly includes a threaded connection to the next sequentially sealed joint body 5 and fiber 7, sealing joint body 5 the fiber 7 is arranged between the seal body 6. Fiber 7 guide surface is a surface or cutting face, cutting face of the pinch rollers 13 and a hard alloy rubs the mill bank or ridge between fields 14.

In this invention the use of the main parts and function are as follows: the mandrel 1 and the drilling tool through the joint is connected with the upper part of the, conical surface sawtooth internal thread 11 and kave 2 hold the fish with 16. Kave 2 through the mandrel 1 sawtooth the conical surface of the internal thread 11 and with the coil and hold the fish or 16. Release ring 3 successful or not successful in salvaging released after the role of the fish. Joint type nut 4:is used for connecting the upper part of the seal assembly and at the lower part of the spear assembly. Sealing assembly comprises a mandrel 1, kave and release ring 3 ; fishing spear assembly which comprises a sealing joint body 5, the sealing body 6 and fiber 7. Sealing joint body 5 has a connecting and assembling the sealing body 6 role. The sealing body 6 as rubber, 16 the bottom fish interference fit with the inner wall, is a major role in the circulation, have the sealing function in the washing process. Fiber 7 guide the spear of this invention 16 can smoothly enter the fish the inner hole. Fiber 7 is divided into different according to the fish: and able to two rubs the mill to direct the awl standards, standards for salvaging is able to the mouth, the fish rules, guide fishing tool can smoothly enter the fish. The mouth for salvaging rubs the mill to direct the awl flanging, flash, the shape of a fish. The milling of the first fiber guide fishing tool smoothly enter the fish. Its milling part is divided into the pinch rollers 13   and a hard alloy rubs the mill bank or ridge between fields 14.

Working process of this invention and the principle

As shown in Figure 1, the invention is mainly used for the improvement of the spear-shaped tile LM-T or upgrade) the structure as shown in Figure 2. bottom wall and anchor packer trip spear the upper part of the mandrel 1 and the drilling tool or drill stem is connected, able of the lower part of the bottom wall and anchor packer trip spear 7 16 guide tool to enter fish the inner hole.

Operating mode: fishing spear the kave 2 the conical surface of the inside serration internal thread 11 and the mandrel 1 sawtooth the conical surface of the outer thread 9 of the large gap, so as to make the slip on the mandrel with a certain stroke can be swollen and reduced. When the slip is inserted into the inner bore of the fish, so long as exert an axial pressure, the mandrel bottom wall and anchor packer along uplink. Due to the axially pulling force of contraction into the fish the slip, at this moment kave upstream and narrow. The drill rod, kave the relatively downward movement of the mandrel. Because of the conical surface of the vertical saw-tooth of the external screw thread is conical inclined plane, with the heavy fishbottom wall and anchor packer necessity to the cone and the small cone end movement, the greater the weight of the fish card-also. The entire weight of the card tile is transmitted to the mandrel. According to need, if after the fish is locked, to the fish circulating flushing pump, it is necessary to pre-mounted seal assembly underland circulation, flushing, to be circulating, after the completion of washing the fish the fishing fall out.