RU2231627C1 - Method for liquidation of open fountains at oil and gas wells - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes taking away fluid, covering and controlling of fountain, treatment of flame by means of spraying with cooling fluid, for example, water. At the beginning, operations for cleaning of territory surrounding mouth of fountain well, in area of heat of torch, of metallic constructions. Also, at first cable members of crane are sprayed, on which traverse is suspended, and bracket of replaced mouth equipment in connection to draining branch pipe on traverse, and slings for connecting traverse to crane frame. Then, mouth equipment is inserted in connection to branch pipe into fountain well. During its full engagement with column flange spraying of cable slings on well mouth is performed, which slings are let through apertures for studs in column flange and lower flange of engaged replacing mouth equipment in connection to branch pipe. After full engagement of equipment and displacement of flame through branch pipe to safe height, spraying of cable slings and traverse slings on well mouth and crane frame and traverse respectively is stopped. Spaying of cables of crane for traverse suspension, of slings of replaced mouth equipment on traverse is continued until traverse is disengaged from mounted mouth equipment and crane outlet. Well plugging is then performed.

EFFECT: uninterrupted emergency maintenance operations during whole cycle of open fountain liquidation with minimal time losses.

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Description

The invention relates to the oil and gas industry, in particular to the elimination of open fountains in oil and gas wells, in particular to the elimination of open burning fountains in gas condensate wells.

From experience in the elimination of open burning fountains in oil and gas wells, it is known that work is first carried out to extinguish the flame of a burning fountain and only then begin work to eliminate the open fountain.

A known method of eliminating open fountains in oil and gas wells, including the removal of fluid, blocking the fountain and its crushing and exposure to the flame by irrigation with a cooling liquid, for example, water [Equipment and tools for preventing and eliminating fountains / V.R. Radkovsky, D.V. .Rymchuk, Yu.E. Lenkevich, O.A. Blokhin. - M .: Nedra, 1996. - S. 142].

The disadvantage of this method in the elimination of open burning fountains in oil and gas wells is the lack of reliability and safety of work to eliminate an open fountain with constant irrigation of the mouth and the area near the mouth due to the occurrence of thick fog, leading to a complete loss of visibility and preventing the continuity of work, which entails a stop in the process of emergency recovery work, an increase in their duration and cost, as well as insufficient reliability and safety clarity of works after the initial fire extinguishing (fire) due to the possible auto-ignition of spilled on the mouth area and near the mouth of liquid hydrocarbons, especially to high probability of spontaneous combustion gas condensate wells, as evidenced by experience Elimination fountains north Tyumen region.

A known method of eliminating open fountains in oil and gas wells, including the removal of fluid, blocking the fountain and its crushing and exposure to the flame, by irrigation with a cooling liquid, for example, liquid nitrogen [RF Patent 2074949].

The disadvantage of this method in the elimination of open burning fountains in oil and gas wells is the lack of reliability and safety of work to eliminate an open fountain when exposed to a flame with liquid nitrogen due to the occurrence of thick fog, which leads to a complete loss of visibility and hindering the continuity of work, which entails stops in the process of emergency recovery work, an increase in their duration and cost.

The challenge in creating the invention is to develop a reliable and safe way to eliminate open burning fountains in oil and gas wells.

The achieved technical result, which is obtained as a result of the invention, is to ensure the continuity of emergency recovery work throughout the entire liquidation cycle of the open fountain at the minimum time due to irrigation of several points of cable equipment instead of irrigation of the entire territory of the work.

The task and the technical result are achieved by the fact that in the known method of eliminating open fountains in oil and gas wells, including the removal of fluid, blocking the fountain and its crushing and exposure to the flame, by irrigation with coolant, in contrast to the prototype, initially work is carried out to remove metal structures from the area around the mouth of the gushing well in the heat affected zone of the plume, with this first, with a stream of water irrigating the rope rig of the crane, on which the traverse, suspension at the replaced wellhead equipment assembled with a branch pipe on the traverse, slings for attaching the crosshead to the crane frame, then the replaced wellhead equipment assembled with a branch pipe in the fountain flame is introduced and, in the process of its full pulling onto the column flange, the rope loops at the wellhead missed are irrigated through the holes for the studs in the column flange and the bottom flange of the draggable replaceable wellhead equipment assembled with a branch pipe, after the equipment is fully dragged and the flame moves Through the branch pipe to a safe height, the irrigation of the cable loops at the wellhead and the sling of attaching the traverse to the crane frame are stopped, and the irrigation of the cable rig of the crane to suspend the traverse, the sling of the suspension of the replaced wellhead equipment on the traverse is continued until the traverse is disconnected from the induced wellhead equipment and then the crane is removed, then killing a well by a known method.

The drawing shows a layout of equipment during the elimination of an open burning fountain.

The method is implemented as follows.

Initially, installation work is carried out on a cable rig, consisting of a crane 1, on which a traverse 2 is suspended, one end of which is attached with slings 3 to the crane frame, and at the other end, on the slings 4, replaceable wellhead equipment 5 is assembled with an outlet pipe 6 for output gushing jet above the rope equipment of the crane 1. To create the tension of the replaced wellhead equipment 5, use the tractor tractor 7, the traction of which is transmitted through the rope loop 8, at the ends of which the wedge clamps 9 are balanced rollers 10 through which two rope loops 11 are passed, the four ends of which are passed from below through the holes for the studs in the column flange 12 and inserted into the corresponding holes for the studs of the lower flange of the replaced wellhead equipment 5, after which the ends of the loops are fastened together. To create uniformity of efforts in each branch of the rope loops 11, balancing rollers 13 are installed on the tractor tractor 7 and the tractor anchor 14, as well as balancing rollers 10 at the ends of the rope loop 8. After that, the assembly is guided at the wellhead. At the same time, partial irrigation of the rope equipment is carried out.

Initially, a stream of water or other coolant is directed to point 15 - the rigging of the crane 1 for suspending the beam 2, sling 4 of the suspension of the replaced wellhead equipment 5 assembled with a branch pipe 6 on the beam 2 and point 16 - sling 3 for attaching the beam 2 to the crane frame 1 , to prevent burning of the ropes under the influence of a flame, the fall of the traverse and replaceable wellhead equipment 5 complete with a branch pipe 6. Then, as the replaceable wellhead equipment 5 complete with a branch pipe 6 enters the flame of the fountain and in the process Nogo their cramming columned on flange 12, producing reflux point of 17 - cable loops 11 at the wellhead, passed through the pin holes in the column flange 12 and lower flange train PR 5 wellhead assembly with a vent pipe 6, to prevent burnout. After full dragging of the replaced wellhead equipment 5 in assembly with the outlet pipe 6, the flame stream through the outlet pipe 6 rises to a safe height. After that, the irrigation of the point 17 - rope loops 11 at the wellhead and the point 16 - sling 3 of the mounting bracket 2 to the frame of the crane 1 is stopped. Irrigation of the point 15 - cable rig of the crane 1 to suspend the beam 2, line 4 of the suspension assembly of the replaced wellhead equipment 5 assembly with a branch pipe 6 on the crosshead 2 continues until the crosshead 2 is disconnected from the replaceable wellhead equipment 5 assembled with the branch pipe 6 and the tap 1.

Then proceed to killing the well by a known method. For example, elevator pipes are lowered into the well and killing fluid (drilling or technological mud) of the appropriate density is pumped through them to the bottom; if necessary, the producing formation is additionally blocked from penetration of the filtrate of the drilling or technological mud.

The proposed method for eliminating an open fountain in oil and gas wells is more reliable and safe than traditional methods for eliminating open fountains, as it eliminates the occurrence of fog and loss of visibility in the work area, provides a more reliable and safe work to eliminate the fountain, eliminates the risk of spontaneous combustion on the mouth and on the territory near the mouth of liquid hydrocarbons, in particular, gas condensate, which may lead to death and destruction The use of machinery and equipment reduces the amount of water and other coolant consumed for irrigating the territory of the bush. As experience in the elimination of fountains in the north of the Tyumen Region shows, the likelihood of spontaneous combustion of spilled hydrocarbons is especially high in gas condensate wells.

Claims (1)

A method of eliminating open fountains in oil and gas wells, including the removal of fluid, shutting off the fountain and its crushing and exposure to the flame by irrigation with a cooling liquid, for example, water, characterized in that the metalwork is initially cleaned of the area around the mouth of the gushing well in the heat zone the impact of the torch, and at the same time, the rope equipment of the crane, on which the yoke is suspended, the suspension of the replaced wellhead equipment assembled with an outlet pipe, is irrigated with a stream of water lump on the traverse, slings for attaching the traverse to the frame of the crane, then replace the replaced wellhead equipment assembled with a branch pipe into the flame of the fountain and, in the process of its full pulling onto the column flange, irrigate the rope loops at the wellhead, passed through the holes for the studs in the column flange and the lower flange of the replaceable wellhead being dragged in assembled with the outlet pipe, after the equipment has been fully dragged and the flame has been moved through the branch pipe to a safe height, they are irrigated The rope loops at the wellhead and the sling for attaching the crosshead to the crane frame, and the irrigation of the crane rig for hanging the crosshead, the suspension sling of the replaced wellhead equipment on the crosshead is continued until the crosshead is disconnected from the induced wellhead equipment and the tap is removed, then the well is silenced.