CN2252880Y

CN2252880Y - Screw pump anchor

Info

Publication number: CN2252880Y
Application number: CN 96200930
Authority: CN
Inventors: 刘帮埊; 徐莘权; 张燕平
Original assignee: Oil Extraction Tech Inst Qinghe Oil Extraction Factory Shengli Oil Field
Current assignee: Oil Extraction Tech Inst Qinghe Oil Extraction Factory Shengli Oil Field
Priority date: 1996-01-07
Filing date: 1996-01-07
Publication date: 1997-04-23
Anticipated expiration: 2006-01-07

Abstract

The utility model relates to a downhole tool of fixed screw pump oil production pipe column. The main characteristics are as follows: the mechanism composed of slips, a slip hanger, a righting seat, a righting block, a spring and a limiting sleeve is sleeved on the central pipe in a hollow mode and locked on the central pipe by the limiting ring, cannot axially move and only can rotate around the central pipe. When the upper joint rotates clockwise by a small angle, the longitudinal saw teeth on the outer circular surface of the upper part of the slip can be anchored on the sleeve. The screw pump stator is used for anchoring the screw pump stator and preventing the pipe column from tripping. The anchoring and the de-anchoring can be realized without any operation, and the device has the advantages of simple structure, reliable anchoring, safe use, convenient construction operation and the like.

Description

Anchoring device of screw pump

The utility model relates to a kind of setting tool of oil extraction pump, and particularly a kind of downhole tool of standing screw pump flow string is called anchoring device of screw pump, is applicable to the fixing of the screw pump that is lowered to oil well.

The anchor that screw pump oil production is commonly used is a kind of rail mounted compression anchor (see figure 6) at present.It is to utilize the ballast of tubing string to realize the tubing string grappling.If ballast is less than 60-80kN, can grappling be lost efficacy because of anchorage force causes slips can not bear the button moment of moving back that screw pump rotor rotates generation at a high speed inadequately; If ballast is excessive, can make tubing string seriously crooked again, the wearing and tearing of aggravation rod string and tubing string inwall, sometimes even tube wall is worn out.It is ineffective often to occur commutation in using at the scene, sits the insecure phenomenon of card.Particularly even more serious in inclined shaft and heavy oil wells, have to sometimes do over again and repeatedly play lower tubular column, sit card and the tubing string anchor could be lived for tens times.In addition, this anchor uses complex operation, and complex structure is heavy again, and length overall surpasses 2m.

The purpose of this utility model is to overcome the weak point of prior art, and a kind of anchor that is applicable to screw pump is provided, and it is the improvement to the prior art product.

The purpose of this utility model is achieved in that by top connection, slips, " O " type packing, garter spring, slips extension, backing-up screw, sets upright the anchoring device of screw pump that seat, wiper block, spring, central tube, stop collar and spacing ring are formed, wherein, the slips righting mechanism sky that seat, wiper block, spring and stop collar composition were hung, set upright to slips, slips is enclosed within on the central tube, and is locked on the central tube and can not can only clockwise rotates around central tube by axial float with spacing ring.When top connection clockwise rotates a low-angle (α) very, vertical sawtooth of slips just can be anchored on and stop screw pump stator to rotate on the internal surface of sleeve pipe, prevents that tubing string from moving back button and come off.Top connection has 6 cannelures that symmetry is uniform, the inclined-plane of groove along counterclockwise radially angle be followed successively by γ=50 °, β=5 °.Top connection and central tube are by being threaded to one, and " O " type packing is installed in and prevents between top connection and the central tube that screw thread from leaking.Be shaped on 4 vertical sawtooth on the face of the outer garden of the slips first half, the boss of slips lower end is hung in the window that is sitting in the slips extension, garter spring is installed in the half garden shape groove at slips middle part and with slips and tightens in the cannelure of top connection, in top connection cannelure ramp effect lower slips hypertonic radially.Seat and stop collar are hung, set upright to slips by being threaded to one, at connection of thread backing-up screw is installed.The wiper block that is shaped on 6 vertical sawtooth on the face of outer garden is installed in 4 grooves setting upright seat, in the hole of wiper block spring is housed, wiper block hypertonic radially under the effect of spring.Spacing ring is installed between stop collar and the central tube and is locked in the cannelure of central tube to guarantee that slips, slips hang, set upright seat and stop collar and can only clockwise rotate and can not axial float around central tube.During on-the-spot the use, top connection tubing round thread of the present utility model is connected with the screw pump stator lower contact, the button torque of moving back that produces when screw pump is worked drives top connection and rotates a low-angle (α＜6 °) very, under the effect on top connection cannelure inclined-plane, vertical sawtooth of slips just can be anchored on internal surface of sleeve pipe to be stoped screw pump stator to be rotated further to reach the purpose that prevents that tubing string from threading off.When screw pump quit work, under the convergent force effect of garter spring, slips promptly can be retracted back to original position.

Compared with the prior art the utility model has following advantage:

It just can realize grappling and remove grappling without any need for operation, and is simple in structure, grappling is reliable, safe in utilization, constructing operation makes things convenient for.

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the utility model status architecture schematic diagram of going into the well.

Fig. 3 is that Fig. 2 is along the A-A cross-sectional view.

Fig. 4 is the utility model working state structure schematic diagram.

Fig. 5 is that Fig. 4 is along the B-B cross-sectional view.

Fig. 6 is existing anchor structural representation.

Accompanying drawing number is: top connection (1), slips (2), " O " type packing (3), garter spring (4), slips are hung (5), backing-up screw (6), are set upright seat (7), a wiper block (8), spring (9), central tube (10), stop collar (11), spacing ring (12), screw pump stator lower contact (13), vertically sawtooth (14), cannelure (15), boss (16), window (17), sawtooth (18), groove (19), sleeve pipe (20).

Referring to Fig. 1, Fig. 2 and Fig. 3, top connection (1) has 6 cannelures (15) that symmetry is uniform, the groove inclined-plane along counterclockwise radially angle be followed successively by γ=50 °, β=5 °, garter spring (4) tightens slips (2) and matches each other in cannelure (15).Be shaped on 4 vertical sawtooth (14) on the outer garden face of the slips first half, flank of tooth garden arc and sleeve pipe (20) internal diameter is complementary.The boss of slips lower end (16) is hung and to be sitting in slips and to hang in the window (17) of (5), and hypertonic radially.Wiper block (8) is installed in the groove (19) of setting upright seat (7), hypertonic radially under the effect of spring (9).Be shaped on 6 vertical sawtooth (18) on the outer garden face of wiper block, flank of tooth garden arc and sleeve pipe (20) internal diameter is complementary.Slips hangs (5), set upright seat (7) and stop collar (11) adopts and is threaded, and prevents the retaining button with backing-up screw (6).Hang (5), set upright the slips righting mechanism sky that seat (7), a wiper block (8), spring (9) and stop collar (11) form and be enclosed within on the central tube (10) by slips (2), slips, and be locked on the central tube (10) and can not can only clockwise rotate around central tube (10) by axial float with spacing ring (12)." O " type packing (3) seals.Therefore, the utility model is hung (5), backing-up screw (6), is set upright seat (7), a wiper block (8), spring (9), central tube (10), stop collar (11) and spacing ring (12) and form by top connection (1), slips (2), " O " type packing (3), garter spring (4), slips.

Using method is referring to Fig. 4, Fig. 5, and when going into the well, top connection tubing round thread of the present utility model is connected with screw pump stator lower contact (13).It just can be realized grappling and remove grappling without any need for operation.The torque (T) that produces when screw pump is worked makes top connection of the present utility model (1) clockwise rotate (α) angle (α＜6 °), sting firmly on sleeve pipe (20) inwall at vertical sawtooth (14) of the utility model slips (2) under the effect on cannelure (15) inclined-plane and again can not rotate, thereby reach the purpose that grappling screw pump stator (13) prevents that tubing string from threading off.Under the effect of spring (9), the frictional resistance that produces between wiper block (8) and sleeve pipe (20) inwall is enough to stop slips (2) to skid in sleeve pipe (20) inwall process at anchor.When screw pump quits work, be recovered to state shown in Figure 2 at the effect lower slips (2) of garter spring (4) convergent force, can trip out ground smoothly.

Claims

1, a kind of anchoring device of screw pump is characterized in that: by top connection, slips, " O " type packing, garter spring, slips extension, backing-up screw, set upright seat, wiper block, spring, central tube, stop collar and spacing ring and form; Top connection and central tube are by being threaded to one, " O " type packing is contained between top connection and the central tube, slips has in the cannelure that vertical serrated portion is installed in top connection, the boss of slips lower end is hung in the window that is sitting in the slips extension, garter spring is installed in the half garden shape groove at slips middle part, slips is hung, set upright seat and stop collar by being threaded to one, and backing-up screw is housed at connection of thread, wiper block is installed in the groove of setting upright seat, in the hole of wiper block spring is housed, spacing ring is installed between stop collar and the central tube and is locked in the cannelure of central tube; Top connection has the uniform cannelure of symmetry, the inclined-plane of groove along counterclockwise radially angle be followed successively by γ and β.

2, anchoring device of screw pump according to claim 1 is characterized in that: be shaped on vertical sawtooth on the face of the outer garden of the slips first half, flank of tooth garden arc and casing inner diameter are complementary.

3, anchoring device of screw pump according to claim 1 is characterized in that being shaped on vertical sawtooth on the outer garden face of wiper block, and flank of tooth garden arc and casing inner diameter are complementary.