SU848589A1 - Packer - Google Patents

Description

Union of Soviet

With socialist

Republics

USSR State Committee for Inventions. and discoveries

O P I S A N E

Inventions

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-wu (22) Declared 05.16.79 (21) 2767650 / 22-03 with the addition of application No. (23) Priority

Published on July 3, 2018. Bulletin No. 27

Date of publication of the description 2310 7.81 (72) Authors of the invention (71) Applicant (N) 848589 (51) M. Cl. ³

E 21. B 33/12 (53) UDC 622.245.

.4 (088.8)

V.I. Krylov, A.N. Furmanov, N.I. Sukhenk ^ b and No..’s. Tkachenko Ί All-Union Scientific Research Institute for Wells and Drilling Fluids of the USSR Ministry of Petroleum and Industry (54) PACKER

The invention relates to the drilling of oil and gas wells and can be used to separate the borehole while isolating the absorption zones of the drilling fluid.

Known packer containing a barrel with a spacer wedge and a sealing collar placed on it, provided with mutually adjacent conical surfaces

Closest to the proposed technical essence is a paKer containing a barrel with a sealing cuff mounted with a gap 15 relative to a spacer wedge made with recesses on the surface in contact with the cuff, and anchoring elements with a drive [2 ^.

The disadvantage of these devices 20 is the need to create significant axial forces on the packer when it is installed due to the large friction forces of the sealing collar against the expansion wedge ”, which leads to a premature failure of the packer and a dramatic complication of work on its use.

The purpose of the invention is the reduction of axial load when installing the packer. thirty

This goal is achieved by the fact that the recesses are made in the form of non-communicating round nests with oval edges arranged in a checkerboard pattern.

The drawing schematically shows the proposed packer, General view.

The packer consists of a barrel 1 with channels 2 and a fitting 3 and an anchor · including a sleeve. 4 with channels 5, cone b and hydraulic cylinder 7, supplying 8 and return 9 springs, respectively between plunger 10 with dies 11 and piston 12c cuff 13 and crown 14 and between the plunger with dies and thrust ring 15.

A spacer wedge 16 with conical and cylindrical surfaces in its upper and middle parts and a sealing collar 17 provided with mutually adjacent conical surfaces are mounted on the barrel.

On the outer surface of the spacer wedge 16 and on the surface in contact with the sealing collar 17, blind non-communicating sockets 18 are made with oval edges overlapping in the direction of forming the wedge and the trunk, and the cuff is installed with a gap on the surfaces adjacent to the wedge.

. The dimensions and location of the nests are determined by the requirements of the technologists for the Sile sealing 'cuff; o packer. Chess should be considered optimal? a new arrangement of nests / providing overlapping them in the direction of the forming wedge and trunk.

The packer works as follows.

After the descent of the packer on the column. _ pipes into the well to a predetermined depth into the column pumped drilling fluid. The pressure in front of the fitting'Z is transmitted through channels 2 and 5 to the hydraulic cylinder 7, lifting the plunger 10 with dies .11 J5 along the cone 6 to the stop wall in the borehole 6 through the piston 12 and the supply spring 8, compressing the spring 8 and partially the spring 9. Slowly lower the pipe string. In this case, the anchor wedges in the borehole, and the shaft 1 moving downward 20 seals the hydraulic cylinder and communicates the pipe space with the under-packer channels 2.

As a result, the pressure at the mouth drops sharply, which is a signal to stop pumping the drilling fluid into the pipe string. By this signal, the drilling fluid is stopped pumping into the pipe string, after which the packer is loaded to the minimum load, which is clearly detected by the weight indicator. In this case, the expansion wedge 16 pushes the sealing · cuff 17, which abuts the lower end against the anchor, to contact the wall of the well. and filled with liquid through the gap 45 between the sealing collar, races. the pore wedge and the barrel of the nest are sealed by the cuff and, acquiring, the properties are quite rigid, but with a minimum coefficient of friction of 40 surfaces, sharply reduce the friction force of the cuff against the packer. This leads to a sharp decrease in the required axial load on the packer.

After installing the packer for insulating work using wide-passage channels 2 extended down the barrel.

When the packer is lifted, the trunk with a spreading wedge returns to its original position, depressurizing the hydraulic cylinder, and the return spring leads the plunger with dies into the transport position.

The application of the proposed packer can reduce the time spent on its installation in the well and increase the durability of its work by reducing the required axial load during its installation.

Claims (2)

The invention relates to the drilling of oil and gas wells and can be used to separate a well bore while isolating mud absorption zones. A known packer containing a barrel with a wedge spaced on it and a sealing cuff provided with mutually adjacent conical surfaces. Closest to the proposed technical essence is a pack containing a barrel with a seal. .Manual. Installed with a gap relative to the spacer wedge, made with grooves on the contact with the cuff surface, and for the corrosive elements with the drive 2. The disadvantage of these devices is the need to create significant axial forces on the packer when installing it due to large forces the rubbing of the sealing cuff on the expansion wedge t TO-leads to a premature failure of the packer and the complication of its use. The purpose of the invention is to reduce the axial load when installing a packer. The goal is achieved by the fact that the notches are made in the form of uncooperative round nests with oval edges arranged in a checkerboard pattern. On the Chart, the proposed packer is shown schematically, a general view. The packer consists of a barrel 1 with channels 2 and a choke 3 and a core including a sleeve. 4 with channels 5, cone 6 and hydrocylindrome 7, supplying B and returning 9 springs, respectively, between plunger 10 with dies 11 and piston 12c with cuff 13 and crown 14 and between plunger with dies and retaining ring 15. A barrel wedge 16 is mounted on the barrel. conical and cylindrical surfaces in its upper and middle parts, and sealing cuff 17, provided with mutually adjacent conical surfaces. The outer surface of the spacer wedge 16 and the barrel surface that contacts the sealing cuff 17 are deaf uncoupling sockets 18 with oval edges, overlapping in the direction of the wedge and the trunk, and the cuff is installed with a gap on the surfaces adjacent to the wedge. The dimensions and location of the sockets are determined by the requirements of technologists to the Strength of the sealing cuff. About the packer. The best is to consider the staggered arrangement of the nests / ensuring their overlapping in the direction of the wedge and the trunk. Packer works as follows. After the packer is lowered onto the pipe string, the drilling fluid is pumped into the well to a predetermined depth. The pressure before fittings3 is transmitted through channels 2 and 5 to hydraulic cylinder 7, lifting piston 10 with dies through piston 12 and feed spring 8, 11 along cone b until it stops at the borehole wall, squeezing up to the spring limit at 8 and partially. Spring 9. Slow down pipe string. At the same time, the core wedges in the well, and the moving barrel 1, downsides the hydraulic cylinder and communicates the tubular space with the subpacker channel 2. As a result, wellhead pressure drops sharply, which is a signal to stop the injection of drilling mud into the pipe string13. By this signal, the pumping of the drilling fluid into the string of pipes is stopped, after which the packer is loaded to the minimum weight of the load that is clearly detectable by the indicator. In this case, the spacer wedge 16 pushes the sealing-cuff 17 against the wall of the squammer 17, which abuts the lower end against the measles, and filled with liquid through the gap between the sealing cuff, the spacer wedge and the barrel of the socket are sealed with a cuff and, having acquired properties that are fairly rigid, but with a minimum ratio friction surfaces, dramatically reduce the strength of friction cuff packer. This leads to a sharp decrease in the thrust load on the packer. After installing the packer, wide pass channels 2 of the downstream trunk are used to carry out the insulation works. When the packer is lifted, the barrel with the expansion HbM wedge returns to its original position, depressurizes the hydraulic cylinder, and the return spring retracts the plunger with dies into the transport position. The application of the proposed packer allows reducing the time spent on its installation in the well, and increasing the durability of its work by reducing the axial load to be reached during its installation. Claims of the invention: A packer comprising a ctvol with a sealing cuff mounted with a gap relative to a spacer wedge, made with notches on the surface in contact with the cuff, and beyond the driving elements that are different. in order to reduce axial load during its installation, the notches are made in the form of uncooperative round nests with oval edges, arranged in a checkerboard pattern ... Sources; information taken into account in the examination 1. Yu. V. Zaitsev. Packers and flow diagrams of their installations. M., .VNIIOENG 1969, p. 79. 2. US patent 2917115, cl. 166216, 1959 (prototype). sixteen 18