The method of thawing hydrateparaffin plugs in oil and gas wells

 

The invention relates to the oil and gas industry and is intended to eliminate hydrateparaffin plugs in oil and gas wells. Well replace the faceplate without pulling tubing on the eccentric faceplate with vertically installed technological hole. Replacement is produced by removing the polished rod from cable hangers, rigid gripping the inner wall of the pipe column tubing (tubing) to relieve tension on the faceplate and hold the casing on weight and fixing faceplate in its upper position by the clamp. For temporary retention of the tubing string suspended for the period of replacement Unscrew the faceplate on the eccentric faceplate use disassembled mounting the faceplate. Mounting the faceplate to the housing on one side and attached to the chassis removable plate with the other hand down under fixed Unscrew the faceplate. Assemble the mounting faceplate. Install it on the outlet tubing. Remove Unscrew the faceplate. Install eccentric faceplate on the top flange of the cross wellhead equipment of the well. Introducing technological hole to Plau casing and tubing. Blow a hole in the tube annulus. Pump working agent through the hole in the tube until the complete elimination of traffic jams. The technical result is to reduce logistical costs in the production of works on thawing hydroparaffining plugs in oil and gas wells, the inside of the tubing which has a rod or foreign objects. 9 Il.

The invention relates to the oil and gas industry and can be applied to eliminate hydrateparaffin plugs in oil and gas wells.

Known method of eliminating hydrate and paraffin plugs in wells and device for its implementation [1] , a technology which provides a descent into the tubing (tubing) well up to the upper boundary of the tube heater on multi-conductor cable connected to the power source, the transfer tube material in the molten state by turning on the heater and promoting it as the melting point of the tube material. If tubing rods or foreign objects (ragged scraper or research instrument, cable), which is higher than the frequency of the tube, this method cannot be applied because of Elea essential features is the way heat hydrateparaffin tube in oil and gas wells, inside the tubing which there are foreign objects, including the descent of the heater in the space between the casing and tubing through the hole in the faceplate, burning holes in the tube of this space and the flow of the working agent until its complete elimination [2].

However, this method allows to eliminate hydrateparaffin tube only in the annulus and only in those wells, the mouth valve which is equipped with eccentric faceplate with vertically installed technological hole unconstrained input electric heater in the annular space of wells.

For reasons that impede the achievement of specified following technical result is that the known method provides for the descent of the heater in the annulus only those wells that have eccentric faceplate with a hole. As is known [3], the hole in the faceplate is made vertically and is intended for technical purposes (the descent into the well of the various research instruments). However, due to the fact that the Fund wells that are equipped with faceplates, minor, applying known spossible with an opening for entry and sealing of the cable, which power to the electrical submersible pump (ESP), or the platters without any holes. However, if the well is equipped with a hole for cable entry for ESP is operated fountain way or sucker-rod pumping unit (SRPS), this hole is not used at all and it is sealed by a plug. The design of this table is such that it, together with attached to it through the upper nozzle tubing concentrically mounted on the flange yoke and the hole of the cable entry angled 25-30othe vertical axis of the faceplate. Since the axis of the gear and the axis of the hole of the cable entry lie in the same vertical plane, the input of the heater into the annulus through the hole to make it is impossible, because the heater rests in the socket of the casing. Therefore, to produce the thawing hydrateparaffin plugs in wells, the inside of the tubing which are rod or foreign objects is not possible.

Way out there, if you replace the faceplate with hole for cable entry for ESP (or without holes) on ekscentricheskoy the investment method by raising the casing drilling system of units for underground or repair of wells on the length of the top tube (0.5 to 1.0 m) in terms of sticking of the column tube, located in most cases up to 500-700 meters from the mouth, is impossible, because in terms of elastic deformation in the body of the top tube and there tensile stresses exceeding permissible. Calculations show that during the lifting of the tubing string, for example, 1,500 meters in length, made of pipes with a diameter of 73 mm and a wall thickness of 5.5 mm and made of steel strength group To having a discontinuous voltage 687 MPa, at a height of 0.7 m in the presence of the tube in the annulus at a depth of 250 meters tensile stresses in the body of the top tube reach 700 MPa, which is greater than the magnitude of the discontinuous voltage and is invalid. In addition, the tension of the tubing string tension forces are transmitted to the tube and at its small capacity, it may break down. Due to possible uncontrolled release of gas mixture adjacent to the well area, which is also invalid.

The task, which is aimed by the invention is the reduction of logistical costs in the production of works on thawing hydrateparaffin plugs in oil and gas wells, the inside of the tubing which has a rod or foreign pre is Licata, which is to create conditions for thawing hydrateparaffin tubes.

This technical result is achieved by the known method of thawing hydrateparaffin tube in oil and gas wells, including input into the process hole faceplate on the top flange of the cross wellhead equipment of the well and the subsequent descent of the heater in the space between the casing and tubing (tubing), burning holes in the tube annulus, the flow of the working agent through the hole in the tube until the complete elimination of tubes that replace the faceplate on the well without pulling tubing on the eccentric faceplate with vertically installed technological hole by removing the polished rod from cable hangers, hard gripping the inner wall of the socket of the casing for removing the load from the faceplate and hold the casing on weight and fixing faceplate in its upper position by the clamp, and to temporarily hold the casing in limbo for the period of replacement Unscrew the faceplate on the eccentric faceplate use disassembled mounting faceplate, which carovano Unscrew the faceplate, assemble the mounting faceplate and mounted on the outlet of the casing, remove Unscrew the faceplate and set eccentric faceplate on the top flange of the cross.

Thanks to the implementation of the procedure for replacing the existing faceplate on eccentric faceplate with vertically installed technological hole you can seamlessly enter the electric heater in the annular space of wells, the inside of the tubing which are rod or foreign objects, and further work on thawing hydrateparaffin tubes.

To implement the method using the known device for the destruction of the hydrate and paraffin removal [4], operating at a respective switch contacts on the mouth or in the mode of the heater or in the mode of the ohmic resistance of the cable (heating cable).

In Fig. 1 shows the elements of the wellhead equipment of the well and the equipment used to replace the faceplate of Fig.2 - same thing, but turned faceplate and installed in its place the mounting faceplate of Fig. 3 - the design of the mounting faceplate (section); Fig.4 - the design of the mounting faceplate (top view), and Fig.5 - podgotovlen eccentric faceplate 20 screw on the outlet of the tubing string and mounted on spacers 27; in Fig.7 - eccentric faceplate 20 is centered relative to the sealing ring 24 of the spider 7; Fig.8 - eccentric faceplate 20 is permanently set in place and secured by studs and nuts 6, Fig.9 - section a-a of Fig.1.

Presented on Fig.1 elements of wellhead equipment of the well and the equipment used to replace the faceplate includes a pipe 1 of the casing that is to be replaced the faceplate 2, the hollow Rublevka, consisting of the bottom 3 and the top 13 parts of its stem, cone 4 on the lower part of the rod 3 with the dies 5, the clutch 12, the screw on the upper part of the stem 13 and the pipe 14. For fastening the faceplate are studs with nuts 6. On the lower flange of the spider 7 is mounted lugs 8, which set the jacks 9, retractable rods 10 which rest on the Elevator 11, planted under the coupling screw 12 on the upper part of the stem 13 trobolowsky.

Is depicted in Fig.2 elements of wellhead equipment of the well and equipment used for replacement faceplate include fixed in the upper position of the Elevator 11 clamp 15 is turned from the pipe 1 faceplate 2 and installed in its place the mounting faceplate 16, which is designed to temporarily hold the casing in podosenov.3 (front view) and Fig. 4 (top view), perform the folding consisting of a body 17, a removable die 18, which is attached to the housing 17 by bolts 19. Before installing the mounting faceplate in place Unscrew the faceplate of her first disassembled into its component parts, and then the casing 17 with one hand down under Unscrew the faceplate, and on the other, a removable plate 18, which is fixed to the housing 17 by bolts 19. Assembled mounting faceplate 16 (Fig.2) is screwed onto the pipe 1 of the tubing string.

In Fig.5 shows the same as Fig.2, but instead removed the faceplate on the Elevator 11 clamp 15 is fixed in the upper position ready for installation eccentric faceplate 20, vertically situated technological hole which is hermetically closed by a plug 21.

In Fig. 6 shows the same as Fig.5, but the mounting faceplate already dismantled and eccentric faceplate 20 screw on the pipe 1 of the casing and installed through spacers 22 on the upper flange of the spider 7.

In Fig.7 shows the same as Fig.6, but installed through spacers 22 on the upper flange of the cross 7 eccentric faceplate 20 is centered in its groove 23 relative to the sealing ring 24 of the spider 7.

In Fig. 8 shows the same, and Phi is lzo 24 on the upper flange of the spider 7 and secured by studs and nuts 6.

In Fig.9 shows a section a-a of Fig.1, which shows the flow channels 25, located between the dies 5 trobolowsky.

The presence of these flow channels allows pumping of the working agent and also work well without removing the lower part of the stem 3 and dice 5 trobolowsky (see Fig.1).

The proposed method is implemented as follows.

When establishing a presence in the tube space of the casing rods or other foreign objects, and in the absence of technological holes in the faceplate or, if it is designed in a way that is not possible to descend the electric heater in the well annulus, to create conditions for thawing hydrateparaffin tubes in a well produced first without pulling the tubing to replace the existing faceplate on eccentric faceplate with vertically installed technological hole that allows you to easily implement this input and produce then thawing tubes.

To replace the faceplate on the well first release to atmospheric pressure in the annulus and tubing. Then the polished rod is disconnected from the cable suspension of the walking beam pumping unit, disassemble the gland and tee, the pubic tubing by any known method. In our case, in Fig.1 illustrates the case of using hollow trobolowsky, which is introduced into the pipe 1 of the casing at 150-200 mm below the faceplate 2. Then produce tension trobolowsky for the clutch 12 by the force of 3-5 tons. As a result, during the course of the lower part stem 3 up his cone 4 pushes the die 5, which teeth biting into the body of the nozzle 1 of the casing and make it hard to grip.

Then loosen the nuts 6 mounting studs faceplate 2 and the force from the hand they are again twisted to lock the faceplate 2. Then produce a further tension for the clutch 12 trobolowsky to complete removal of load from the faceplate 2.

Tension produce any lifting equipment, which by their technical characteristics meet the requirements and process conditions. These can be, for example, units for underground and capital repairs of wells, cranes, jacks. In Fig.1 illustrates the case of using the jacks. To install them on the bottom flange of the spider 7 is mounted lugs 8, which set the jacks 9. Retractable rods 10 jacks 9 rest against the Elevator 11, planted under the clutch 12 of the upper part of the stem 13 trobolowsky.

The amount of effort in tension , and weight of the liquid column, located in the tubing.

After removing the load from the face-plate 2 mounting studs with nuts 6 remove and produce loosening of the faceplate 2 from the socket 1 of the casing by rotating to the left.

Disconnected from the tubing faceplate 2 is fixed in the upper position (see Fig. 2) clamp 15. Then disassembled mounting the faceplate 16 by parts fail under fixed Unscrew the faceplate 2, collect it and is wound on the pipe 1 of the tubing string.

Then remove the load from the jacks 9 and the column tubing is left hanging on the mounting plate 16. Next, take the Elevator 11, remove Unscrew the faceplate 2 and replace it prepared to enter the setting eccentric faceplate 20 is vertically positioned technological hole, closed by a plug 21 (see Fig.5). The Elevator 11 is set in place, eccentric faceplate 20 is fixed in the upper position by the clamp 15 and jacks 9 remove the load from the mounting faceplate 16 in the manner similar to that described above. After mounting the faceplate 16 Unscrew from the pipe 1 of the casing disassembled into its component parts and removed and in its place wind eccentric faceplate 20 is vertically positioned technological hole, sealed z the faceplate 20 center of its groove 23 relative to the sealing ring 24 (Fig. 7), unloaded, remove the spacers 22 and finally unload on the sealing ring 24 of the upper flange of the spider 7 and fixed by bolts and nuts 6 (Fig.8).

Further, all equipment (jacks, the Elevator stops) is removed, then turn the clutch 12 trobolowsky, remove the pipe 14 and turn the upper part of the stem 13 trobolowsky (Fig.1). Remove the lower part 3 of the stem with 5 dice at this stage do not produce, because the presence of flow channels 25 between the dies 5 trobolowsky (see Fig. 9) provides free circulation of fluid in the well and pumping the working agent.

Then mount bezel tee, omentum and produce down the heater in an armored multi-conductor cable into the annulus between the casing and tubing.

Removing the lower part of the rod 3 with the dies 5 (Fig.8) is carried out after the lifting of the tubing string produced during capital repair of wells. For this purpose the pipe 1 turn away from faceplate 20 and the rest of the tubing string and return stroke vyrisovyvaet the lower part of the rod 3 with 5 dice.

Sources of information 1. RF patent 2003781, E 21 In 43/24, 1991.

2. The Pat is RA, 1987, S. 135.

4. RF patent 2112134, E 21 In 37/00, 36/04, 1995.

Claims

The method of thawing hydrateparaffin tube in oil and gas wells, including input into the process hole faceplate on the top flange of the cross wellhead equipment of the well and the subsequent descent of the heater in the space between the casing and tubing (tubing), burning holes in the tube annulus, the flow of the working agent through the hole in the tube until the complete liquidation of the tube, characterized in that the faceplate replaces the well without pulling tubing on the eccentric faceplate with vertically installed technological hole, by removing the polished rod from cable hangers, hard gripping the inner wall of the socket of the casing for removing the load from the faceplate and hold the casing on weight, and fixing faceplate in its upper position by the clamp, and to temporarily hold the casing in limbo for the period of replacement Unscrew the faceplate on the eccentric faceplate use disassembled mounting faceplate, which in parts, building on one side and attached to the author of the faceplate and mounted on the outlet of the casing, remove Unscrew the faceplate and set eccentric faceplate on the top flange of the cross wellhead equipment of the well.

 

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FIELD: oil and gas industry.

SUBSTANCE: method includes lowering into well, to depth of forming of deposits, of linear heating element in form of pipes column in well or of metallic conductor and feeding conductor. Heating is performed by letting high-frequency electric current through feeding conductor while providing for its locking in head portion of heating system at depth of forming of deposits. Metal of linear heating element is effected with high-frequency field of feeding conductor. Frequency of electric current is set at lower limit on basis of condition, that depth of penetration of high-frequency field into metal of linear heating element was less than its thickness. Heat production is adjusted to provide primary heat production along linear heating element by decreasing space between the latter and feeding conductor and by increasing frequency of electric current from this lower limit. Locking of electric current in head portion of heating system between heating element and feeding conductor is performed through locking element, having falling dependence of resistance from temperature increase. Frequency of electric current is set at lower limit during lowering of heating system and is increased after passing whole depth of forming of deposits and obstructions. Locking of electric current in head portion of heating system can be performed through substance, having properties of weak electrolyte, for example, through well liquid, and frequency of electric current is increased in area of manifestation of effect of steep increase in its productiveness. Device has heating system, consisting of feeding conductor and linear heating element, and locker of electric current between these in its head portion. Feeding conductor is made of coiled and isolated conductors. Linear heating element is in form of column of pipes in the well or a bare metallic conductor. Cross-section of conductor is selected to be enough for supporting weight of heating system lowered into well. Electric current locker in head portion of heating system is made in form of winding of high-frequency wire, woven on ferrite core and placed inside metallic cover in such a way, that ferrite core by end portions is locked on this cover. Grade of ferrite of core is selected from condition, that its temperature of magnetic properties loss should exceed temperature of melting of deposits in a well, but is not greater than temperature of their combustion or carbonization. Current locker in head portion of heating system may be made in form of bare electrode, connected to feeding conductor and placed relatively to heating element in such a way, that between them a channel is formed along axis of bare electrode for passing of well liquid.

EFFECT: higher efficiency, higher reliability.

2 cl, 4 dwg

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