RU2524787C1 - Re-equipment of self-squeezing gas well head - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises removal of used production tree from well head and installing the new production tree. Lower and upper master valves are removed from well head as well as spider of Christmas-tree with four string gates and two angular unions and buffer gate valve. Used pipe head is kept at well head to mount pre-dismantled Christmas-tree spider with two string gate valves. New adapter coil is mounted at the spider to suspend central production tubing therefrom to be lowered into inner space of the main production tubing. Thereafter new central smaller-diameter gate valve is mounted at the new adapter coil to support new smaller-size top spider with two new smaller-diameter top string gate valves. Then, new smaller-diameter buffer gate valve is arranged at new top spider.

EFFECT: accelerated re-equipment owing to application of pre-mounted Christmas-tree equipment.

2 dwg

Description

The invention relates to the oil and gas industry, in particular to the operation of gas wells at the final stage of field development, in particular to the exploitation of flooded, so-called self-priming, gas wells.

At the final stage of the development of gas deposits, the reservoir energy is not enough to ensure the removal of fluid accumulating at the bottom from the well. Under the influence of an ever-increasing volume of this fluid, the wells are stopped, since the velocity of the upward gas flow is not enough to carry the fluid to the surface. When a certain column height of this fluid is reached at the bottom, gas from the formation cannot overcome the fluid barrier and the well self-pressures, that is, it shuts off [A. Kustyshev Complicated repairs of gas wells in the fields of Western Siberia. - M: Gazpromexpo LLC, 2010. - 212 p.].

Various methods are used to remove fluid from the bottom of gas wells, for example: blowing a wellbore into the atmosphere or a gas pipeline without re-setting the mouth; injecting liquid or solid surfactants into the slaughter; the use of a plunger elevator; Reducing the diameter of the elevator column to increase the gas flow rate with re-mouth.

One of the methods for removing liquid from the bottom of gas wells is to equip the wells with two concentric lift columns, the main lift column and the central lift column lowered into it with the obligatory re-entry of the wellhead by replacing the old fountain valves with new ones. The main disadvantage of this method of re-dressing is the significant material costs for the purchase of new equipment and for re-installation of the wellhead piping of the well.

There is a method of re-lining the mouth of a self-priming gas well, including dismantling the fountain armature previously installed on the mouth with one main lift column and installing a new fountain arm with two lift columns suspended in it, the main lift column and a smaller central lift column lowered into it diameter [Kustyshev A.V., Epryntsev A.S. Problems and ways to increase the efficiency of gas well operation at the final stage of development // Geology, Geophysics and the development of oil and gas fields. 1911. No. 9. - S. 59-64].

The disadvantage of this method is the large material and monetary costs for re-lining the wellhead associated with the purchase, transportation and installation of new wellhead equipment when not yet using well-functioning wellhead equipment dismantled from the wellhead.

The objective of the invention is to reduce the cost of re-lining the mouth of a self-priming gas well.

The technical result that is achieved as a result of the implementation of the claimed technical solution consists in reducing the metal consumption of the structure due to the refusal to purchase and supply parts of new equipment, in reducing the duration of the re-dressing of the mouth of a self-filling gas well through the use of elements of wellhead equipment previously installed at the well and dismantled with her during the repair process.

The specified technical result is achieved by the fact that in the known method of re-lining the mouth of a self-priming gas well, including dismantling - installation of fountain fittings consisting of a pipe head, a spider of a fountain tree, a buffer root and root valves, in contrast to the prototype, the root and root valves are removed from the wellhead , a cross, then mounted on a pipe head a dismantled cross of a fountain tree with one string bolt installed on both sides of it, mounted on crosses not the upper transfer coil, the central lift column is suspended in it, lowered into the internal cavity of the main lift column, the central stem valve of a smaller diameter is placed on the upper transfer coil, on which the upper crosspiece of a smaller size with two smaller diameters is placed by the upper string valves, and on the newly mounted the upper crosspiece is placed buffer valve of a smaller diameter.

Figure 1 shows a diagram of the lining of the wellhead to re-ligation, where the numbers indicate: 1 - the main valve; 2 - radicular valve; 3 - a cross of a Christmas tree of fountain reinforcement; 4 - string valve, 5 - angle fitting; 6 - buffer valve; 7 - transfer coil; 9 - the main elevator column.

Figure 2 - shows a diagram of the binding of the wellhead, after re-binding, where the numbers indicate: 3 - the cross of the Christmas tree fountain, 4 - string valve, 7 - transfer coil, 8 - pipe head; 9 - the main elevator column, 10 - the central elevator column; 11 - upper transfer coil (adapter); 12 - central valve; 13 - upper crosspiece; 14 - a new string valve; 15 - a new buffer valve; 16, 17.18 - pipeline.

The method is as follows.

In the process of overhaul of the well from the mouth of a self-thrusting gas well (Fig. 1), only the fountain tree of the fountain arm is dismantled, leaving the pipe head of the fountain arm at the mouth. The dismantled fountain tree contains a root 1 and 2 root stem valves, a spider 3 of a fountain tree with four string valves 4 and two corner fittings 5, a buffer valve 6.

Then (Fig. 2), on the transfer coil 7 of the dismantled old pipe head 8, on which the main lift column 9 is suspended, the previously dismantled crosspiece 3 of the fountain tree is mounted with only one string valve 4 installed on both sides thereof without an angled fitting.

The central lift column 10 from pipes of smaller diameter is lowered into the borehole into the internal cavity of the main elevator column 9 and suspended in a new upper transfer coil 11, which is mounted on the upper flange of the spider 3 of the Christmas tree.

Instead of the previously used root 1 and root 2 stem valves, a new, reduced diameter central stem valve 12 is mounted on the upper transfer coil 11. The word “new” refers to the installation of equipment of a different standard size, and not what was used in the previously dismantled from the mouth fountain fittings.

An additional smaller upper crosspiece 13 is additionally mounted on the central stem valve 12 with one smaller diameter upper string valve 14 installed on both sides.

On the upper flange of the upper crosspiece 13 mount a new reduced diameter buffer valve 15.

The upper string valve 14 is connected via a pipe 16 to a pipe 17 extending from the lower string valve 4 to form a common pipe 18, called a “flow line”.

Further (not shown in FIG. 2), the wellhead piping of a self-priming gas well is equipped with flowmeter devices and a control valve and other necessary equipment for the normal operation of a self-priming gas well with the regulation of technological modes of its operation.

An example implementation of the method.

From the mouth of the watered gas well dismantle the Christmas tree EF 150 / 100x21 of the fountain reinforcement AFK6-150 / 100 × 21 according to GOST 13846-89, leaving the pipe head TG 150 × 21 of the fountain reinforcement AFK6-150 / 100 × 21 in accordance with GOST 13846-89 located on the column head OKK1-168 × 219-210 according to GOST 13846-89. On the transfer coil of the TG 150 × 21 pipe head, the crosspiece of the EF 150/100 × 21 fountain tree is mounted with only one string valve ZMS 100x21 installed on both sides of it. The central lift column with a diameter of 89 mm is lowered into the internal cavity of the main lift column with a diameter of 168 mm and suspended in a new upper transfer coil, which is mounted on the upper flange of the spider of the fountain tree of the fountain tree EF 150/100 × 21. Mount the central stem valve ZMS 89 × 21. An upper crosspiece with installed ZMS 89 × 21 string valves is mounted on the central stem valve, and an 89 × 21 ZMS buffer valve is mounted on it.

The use of elements of an old Christmas tree dismantled from the mouth of the fountain tree can reduce the metal consumption of the new equipment supplied and reduce the cost of its acquisition without compromising the reliability of the fountain and the well as a whole.

Claims (1)

A method of re-lining the mouth of a self-priming gas well, including dismantling - installation of fountain fittings consisting of a pipe head, a spider of a fountain tree, a buffer root and root valves, characterized in that the root and root valves, a crosspiece are dismantled from the wellhead, and then dismantled are mounted on the pipe head the spider of the fountain tree with one string bolt installed on both sides of it, mount the upper transfer coil on the spider, hang the central elevator in it th column descends into the inner cavity of the main tubing, is placed on top of the transfer coil central stem bolt of smaller diameter, which is placed on the upper crosspiece of smaller size with two smaller-diameter upper string dampers and mounted again on the upper bracket disposed buffer bolt of smaller diameter.

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