CN2378531Y - High temperature and high pressure safety joint - Google Patents

Abstract

The utility model relates to a high temperature and high pressure safety joint, which is used for connection of downhole pipe columns of oil wells, water injection wells, and thermal recovery steam injection wells in oil production engineering. The utility model mainly solves a sand clamping problem of the pipe columns. The utility model is composed of an upper joint (1) which is provided with female buckles on both heads, a connecting short piece (2) which is provided with male buckles on both of the two heads and is connected with the upper head, and a lower joint (3) which is connected with the lower head of the connecting short piece and is provided with the female buckle on one head and is provided with the male buckle on the other head. The utility model can resist high temperature and high voltage; the structure is simple, and the volume is small. Disjunction of the upper and the lower joints not only can positively rotate and dislocate on a reverse opening, but also can be pulled off and dislocated. The utility model has the advantage of convenient and flexible usage.

Description

The HTHP safety joint

The utility model is a kind of HTHP safety joint that oil well in the petroleum production engineering, water injection well and thermal recovery notes vapour well, producing well tubing string are connected usefulness, and it can control the generation of down-hole accident, thereby reduces the operation number of times, reduces operating cost.

Existing safety joint, complex structure, volume is big, materials are many, maximum outside diameter 110mm, length 458mm, operating pressure 5.0MPa, heatproof is below 100 ℃, structure is that top connection and lower contact two parts are formed, and connects with 4 pins between it, seals with O-ring seals, can not high temperature high voltage resistant, the tubing string that can only be suitable for the low-temp low-pressure well connects, and can not be connected with it for metal wool pipe in the thermal recovery oil well pipe and wrapping wire pipe are middle, and annual well workover is pulled out wrapping wire and metal wool chimney filter because of rising, owing to safety joint is not installed, because of the workover cost that plays the bit freezing overhaul just needs millions of units.

For solving the problems referred to above that existing safety joint exists, designed a kind of high temperature high voltage resistant, adapt to that various oil-water well tubing strings connect, the full joint of HTHP safety simple in structure, that volume is little.

Box is established in the HTHP safety joint by two top connection (1) and two are established connection pipe nipple (2) that the higher authorities of pin thread are connected, are established box with one that is connected following connection of pipe nipple, a lower contact (3) of establishing pin thread is formed.It is characterized in that top connection and lower contact to use material be No. 45 steel of carbon, is connected pipe nipple use material to be blue or green steel; Connection pipe nipple top is provided with thick positive pin thread, the bottom is provided with thin anti-pin thread, and its internal diameter is up-small and down-big, and the reducing place establishes a Stress Control step, the disconnected 100kN that loads that takes off of control; The gas thread box is established on the top of top connection, the accurate screw thread box of bottom bidding; Thin anti-box is established on lower contact top, and the gas thread box is established at the middle part, and the gas thread pin thread is established in the bottom; The safety of the safety joint load that disconnects is 80～100kN, more than the withstand voltage 20MPa, between 300～400 ℃ of the heatproofs.

For the technical scheme of the application's HTHP safety joint is further open, further set forth below in conjunction with 1 pair of this programme of accompanying drawing.

Accompanying drawing 1 is the structure chart of HTHP safety joint.

The utility model is used for high temperature and annotates the metal wool filter sand control pipe of vapour well or wrapping wire pipe gravel and dash and fill out sand control pipe, general steamed well or producing well, well depth is about 1500 meters～2000 meters, annotating vapour interval or producing interval, generally below 1300 meters, to annotate high steam at this interval, pressure is generally more than 18MPa, because the pressure height causes the stratum silt particle of annotating the vapour interval soft, collapse in the beach, block annotating vapour interval or producing interval, Deng changing when annotating vapour distributor or oil recovery distributor or change that layer is annotated vapour or when recovering the oil, tubing string just rises not come out, and causes and annotates vapour well or producing well overhaul.For addressing this problem, to descend anti-sandpipe of metal wool filter or wrapping wire pipe gravel to prevent that towards filling out sand control pipe the problems referred to above from taking place at this interval, every 4 to 5 meters of anti-sandpipes, under this interval more than 100 meter, connecting the HTHP safety joint of just using the application between the every anti-sandpipe connects, its top connection (1) box is connected with the oil pipe pin thread, its lower contact (3) pin thread is connected with the box of anti-sandpipe, the pin thread of anti-sandpipe is connected with the box of the top connection of HTHP safety joint, lower contact is connected with the box of anti-sandpipe, with the HTHP safety joint company of one one of anti-sandpipe is gone down, up to the design total length of anti-sandpipe like this.

When high temperature (more than 200 ℃) high pressure (more than the 18MPa) are annotated the vapour well, annotating vapour annotated after the stage, need change when annotating the vapour distributor or changing anti-sandpipe, the whole tubing string that needs to annotate the vapour well all rises out, in the process that rises as meet the sand card, tubing string rises motionless, at this moment HTHP safety joint has just been worked, because the connection pipe nipple (2) of HTHP is to make of bronze, outside dimension is the same, and internal diameter is up-small and down-big, is provided with a Stress Control step at the reducing place and controls the disconnected stress that takes off, the big more disconnected stress that takes off of step is more little, and the more little disconnected stress that takes off of step is big more.General needs according to design of string pipe, the step proof stress is at 80kN to 100kN, when the upper lifting force of working rig lift pipe string reach design disconnected when taking off stress, just break at the step place, trip out the disconnected a little above tubing string that takes off, salvage the disconnected a little following tubing string that takes off again, salvage the anchor lower end and be provided with the oil pipe pin thread, the oil pipe box that is provided with the lower contact of HTHP safety joint middle part is make-up mutually, aligning is tightened, when tightening,, the company of HTHP safety joint is provided with anti-thin pin thread because saving the lower end of pipe nipple, must when aggregate erection, tighten, no matter can not cause under normal moment of torsion when lower tubular column or lift pipe string that tubing string disconnects, after tightening, the anti-sandpipe of sand card tripped out, or increase positive torque, back-off is thrown off top connection and lower contact and tripped out, and is many as the anti-sandpipe of sand card, just salvages several times by above order, sand card power is decomposed, up to down-hole string is all proposed.The use of HTHP safety joint has been avoided annotating the overhaul of vapour well or scrapping, and has solved the practical problem in the production management.

This HTHP safety joint is because to connect the material that pipe nipple selects for use in the middle of it be bronze, and bronze is disconnected, and to take off stress little, good airproof performance, and the energy high temperature high voltage resistant makes the simple in structure of safety joint, and volume is little, and (φ 95 * 200mm), easy to use, by trying out of 2 mouthfuls of notes vapour wells, be subjected to user's welcome deeply.

Description of drawings 1---top connection 2---connecting short section 3---lower contact

Claims (4)

1, the utility model is to be used for the petroleum production engineering oil well, water injection well is annotated a kind of HTHP safety joint that vapour well down-hole string is connected with thermal recovery, be provided with the top connection (1) of box by two, be provided with the connection pipe nipple (2) that the higher authorities of pin thread are connected with two, establish box with one that is connected following connection of pipe nipple, a lower contact (3) of establishing pin thread is formed, it is characterized in that even saving pipe nipple top and be provided with thick positive pin thread, be connected with top connection bottom box, the bottom is provided with thin anti-pin thread and is connected with lower contact top box, its internal diameter is up-small and down-big, and the reducing place is provided with a Stress Control step.The disconnected load 80-100kN that takes off of control.

2, HTHP safety joint according to claim 1 is characterized in that the top of top connection is provided with the gas thread box, and the bottom is provided with the thick box of standard thread.

3, HTHP safety joint according to claim 1 is characterized in that lower contact top is provided with thin anti-box, and the middle part is provided with the gas thread box, and the bottom is provided with the gas thread pin thread.

4, it is characterized in that according to claim 1,2,3 described HTHP safety joints the material that top connection and lower contact are used is the C45 steel, the use material that connects pipe nipple is a bronze.