RU2179628C2 - Process of intensification of production of gas - Google Patents

Abstract

FIELD: equipment and technology of recovery of well product from well. SUBSTANCE: process includes sinking of tools and tubing string into well, expansion of coupling channels of pool by fluid, their filling up with filtering material, installation of well and gravelsand filters and provoking inflow of gas into well. Salient feature of process lies in conducting this work with single sinking-lifting operation of tubing string and without any time breaks. With this in mind sunk equipment is fitted with set of well filter and combined circulation valve with holes to wash out surplus of filtering material, with bushing shutting off these holes and clearing space of well filter to provoke inflow of gas. EFFECT: prolonged usage of productive horizons containing siltstones. 2 dwg

Description

 The invention relates to techniques and technology for producing a product from a well, and in particular, to methods for intensifying gas production.

 There is a method of intensifying gas production by creating depressions on the formation by replacing high density solutions in the well (drilling fluids) with lower density solutions (water, oil, aerated fluids, foam, etc.), as well as lowering the level of fluid in the well by displacing it compressed gas (nitrogen, air) [1].

 However, this method for productive formations with high and low reservoir pressures and having a lithological structure containing siltstones (clay, sand fractions of 0.1 mm and below) does not provide a gas inflow during well development due to plugging of cracks, pores (communication channels reservoir - well).

 There is a method of intensifying gas production by installing a gravel-sand filter between the perforation part of the production string and the downhole filter [2].

 This method does not provide a full guarantee for the long (long) life of productive horizons (formations) containing siltstone in them, since small particles in the formation rock clog the annulus and gravel-sand filter, blocking the movement of gas flow into the well cavity filter. And, as a result, gas production in such wells is gradually reduced and reduced to zero.

 The closest in technical essence and the achieved result is a method of stimulating gas production by creating a hydraulic fracturing, including lowering the tubing string into the well of the tool, expanding the communication channels of the formation with liquid, filling them with filter material and causing inflow [3].

 The known method does not give a full guarantee for a long (long) life of productive horizons (formations) with siltstone in them, since small particles in the formation rock gradually or relatively quickly penetrate the wellbore and firmly plug the annular space between the perforated part production casing and installed well filter.

 The aim of the present invention is to increase the term (duration) of the operation of productive horizons (formations) containing siltstones.

 This goal is achieved by the fact that in the known method of intensifying gas production, including lowering the tool into the well of the tubing, expanding the communication channels of the formation with liquid, filling them with filter material, installing a downhole and gravel-sand filter and causing gas to flow into the well, according to the invention the expansion of the channels, filling them with filtering material, installation of the borehole and gravel-sand filters and the call of gas inflow into the well are carried out in one round-trip operation inst umenta tubing and without discontinuity in time, for which the landing tool is equipped with a set of well screen and combined with the circulating valve openings for washing excess filter material, a sleeve for covering the openings and releasably filter cavity downhole gas inflow to the call.

 Figure 1 presents the layout diagram of the flushing equipment into the well, figure 2 is a General view of the combined circulation valve.

 A set of equipment is lowered into a well cased with a production casing, consisting of a shoe 2, a liner 3, centralizers 4, a downhole filter 5, nozzles 6, a superfilter pipe 7, a left sub 8, a combined circulation valve 9, a circulation valve 10 and a pump and compressor tool pipes (tubing) 11.

 The combined circulation valve 9 has a hole for washing out excess filter material, a sleeve for blocking this hole and the possibility of releasing the cavity of the downhole filter to cause gas inflow.

 Fluid under pressure is supplied into the annulus to expand the communication channels 12 in the formation 13 while maintaining back pressure in the tubing 11.

 Then into the annular space with back pressure in the tubing 11 serves the filter material 14 and then into the communication channels 12 and fill the annular space to the level of the holes 15 of the combined circulation valve 9. Excess filter material is washed to the surface with washing liquid through tubing (tubing) ) 11 through holes 15.

 After that, the discharge ball 16 is lowered into the tubing (11), and the pins 17 are cut off by moving the sleeve 18 downward, which covers the holes 15.

 Further, moving down, the sleeve 18 cuts off the saddle 19 and the shear plug 20.

 Ball 16, seat 19 and shear plug 20 fall down the liner 3. The cavity of the downhole filter 5 is released to cause gas to flow from the formation into the well.

 If it is necessary to kill the well, a circulation valve 10 is provided in the set of downhole equipment, the openings of which are opened by a shear sleeve when lowering the ball 21 and creating a calculated hydraulic pressure on it.

 Using the proposed invention will increase the period (duration) of the exploitation of productive horizons (formations) containing siltstones.

Sources of information
1. Bulatov A.I. et al. Theory and practice of well completion. - M .: Nedra, 1988, v. 5, p. 166-181.

 2. Guiding regulatory document "Instructions for equipping wells with gravel filters by the reverse circulation method." - RD 51-97-84. M., 1984.

 3. Basarygin, Yu.M. et al. Repair of gas wells .- M.: Nedra, 1998, p. 162-175.

Claims (1)

 A method of intensifying gas production, including the descent of a tubing tool into a well, expanding the communication channels of the formation with liquid, filling them with filter material, installing well and gravel and sand filters and causing gas to flow into the well, characterized in that the channels are expanded and filled with filter material, the installation of the downhole and gravel-sand filters and the call of gas inflow into the well is carried out with one tripping operation of the tool tubing and without a gap in Straps for which the landing tool is equipped with a set of well screen and combined with the circulating valve openings for washing excess filter material, a sleeve for covering the openings and releasably filter cavity downhole gas inflow to the call.

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