RU73691U1 - HYDRAULIC BOTTOM ENGINE FOR DRILLING OIL AND GAS WELLS - Google Patents

Abstract

The utility model relates to the oil industry, in particular, to hydraulic motors for drilling deep wells. The proposed hydraulic downhole motor provides a high moment-frequency characteristic, which contributes to an increase in the efficiency of rock destruction by a drill bit at the bottom of the well and an increase in drilling performance. The downhole hydraulic motor consists of series-connected working sections, while the working sections are interconnected by a two-pin sub, providing the connection of two cases of heterogeneous engines with the possibility of placing a cone-splined coupling connecting the sections shafts inside the cavity of this sub.

Description

The utility model relates to the oil industry, in particular, to hydraulic motors for drilling deep wells.

Known hydraulic downhole motors (3TSSh1-195, 3TSSh-195TL, etc.), the working (technical) characteristics of which are provided by assembling individual standard sections into a single engine with the number of sections from three to six [V. Litvyak. About the results of field tests of a multi-section turbodrill 6TS2Sh-195 // Drilling: Otech. Experience: express inform. / VNIIOENG. - 1978. - No. 11. - C.3-5; Safonov A.D., Sayapov I.M., Filin V.V. The use of a 3TSSh-195TL turbodrill in a five-section design / Inform. Bulletin of the Tyumen TSTI. - Tyumen, 1979. - Issue 53. - 2 s]. Sectional hydraulic downhole motors (A7GTSH, TPX1-195, etc.) are known, the improvement of the working (technical) characteristics of which is achieved by installing hydrodynamic braking stages in the upper section [N. Sereda, V. A. Sakharov, A. N. Timashev Oil and Gas Satellite: A Handbook. - M .: Nedra, 1986. - 352 p.: Ill. - S.66-70; Handbook of a Drilling Engineer / Ed. IN AND. Mishchevich, N.A. Sidorov. - M.: Nedra, 1973. - In 2 ^x T. - T.1. - S.212-256].

However, the technical characteristics of these engines have a narrow range of changes that are insufficient for a wide range of drilled rocks.

Known hydraulic downhole motor (US Pat. RF №2017921). In the proposed engine design, the working chambers are formed by the surface of a helical polyhedron - a rotor, a cylindrical surface of the stator and an intermediate elastic shell,

located between them, which is fixed on the inner surface of the stator. Under the influence of hydraulic pressure, the elastic shell interacts with the surfaces of the helical polyhedron-rotor, creating a deflecting moment on it. However, this engine has a very complex structure.

Also known is a downhole hydraulic motor (US Pat. RF No. 2200815). The downhole hydraulic motor comprises a housing having an element for connecting to the drill string, and a cavity for supplying flushing fluid, one stator element with channels guiding the fluid flow, spiral blades are made in the form of spiral grooves in the portion of the outer side surface of the turbine wheel, and channels guiding the fluid flow made in the form of longitudinal grooves, while the number of longitudinal grooves located in the same plane of the cross section is not equal to the number of spiral grooves. However, it also has a very complex structure.

Closest to the proposed is a downhole hydraulic motor (US Pat. RF No. 2057883). The downhole hydraulic motor includes serially connected working sections, interconnected by elements for curving the axis of the engine, made of two coaxially mounted drill pipes. However, this engine is only suitable for drilling intervals of a set of curvature parameters of wellbores.

The objective of the utility model is to create a hydraulic downhole motor, which would provide a higher moment-frequency characteristic, which helps to increase the efficiency of rock destruction by a drill bit at the bottom of the well and increase drilling performance.

The technical result is achieved in that the downhole hydraulic motor contains two sections (one is a turbine engine, the second is a volumetric engine) connected by a double-pin sub, with

dimensions that allow you to connect two heterogeneous engines and provide the ability to place inside the cavity of this sub conical splined coupling connecting the shafts of the sections.

The design of the proposed downhole hydraulic motor (KGZD) is shown in figure 1: 1 - section of a three-dimensional engine; 2 - spindle section of a volumetric engine; 3 - spindle neck under the clamp; 4 - the output part of the spindle shaft of the surround engine; 5 - windows for the exit of the drilling fluid; 6 - two-nipple sub; 7 - conical-splined coupling; 8 - shaft of a turbine engine section; 9 - spindle section of a turbine engine; 10 - nipple of the spindle of a turbine engine; 11 - spindle shaft of a turbine engine; 12 - sub for attaching the drill bit.

The volumetric engine section 1 through the spindle section 2 is connected to the turbine engine section 9 using a two-pin sub 6, the geometrical dimensions of which provide a solid connection of two cases of heterogeneous engines and allow the conical splined coupling 7 to be connected inside the cavity of this sub, connecting the shafts of sections 4 and 8 .

The device operates as follows.

A two-pin sub 6 is screwed into the spindle section of the volumetric engine, to the lower part of which the turbine engine section with the spindle 9 is connected. The spindle shafts of the volumetric engine and the turbine engine are connected using a cone-splined coupling 7. The drilling fluid passes through the volumetric engine section and the spindle shaft of the same engine and leaves it through two symmetrically located windows 5. Next, the drilling fluid passes through the working stages of the turbine engine, a spindle shaft 11 and further to the drill bit. Such a combination of heterogeneous engines shifts the performance of a high-speed turbine engine towards stable shaft operation

at a low speed, and the volumetric engine, providing hydrodynamic braking, provides high torque characteristics and throttle response to axial load.

The results of field tests of the proposed engine (KGZD) when drilling wells with serial chisels Ш215,9СГВ and Ш215,9СГН are presented in table 1 in comparison with the development of the same type of bits with serial turbodrills 3TSSh1-195 and screw downhole motors D1-195.

Thus, the proposed hydraulic downhole motor allows to improve operational performance, increase the performance of drilling bits by 53-100% in drilling for chiselling, by 3.9-41.6% in terms of mechanical speed of sinking, by 17.2-34% in terms of running penetration rate.

Table 1
Comparative Results of Used Bits Conditional drillability interval (pack of conditional drillability), m Type of downhole motor Change in bit performance (%) relative to engines 3TSSh1-195 D1-195 KZGD 3TSSh1-195 D1-195 h _g , m V _M , m / h V _P , m / h h _g , m V _M , m / h V _P , m / h h _g , m V _M , m / h V _P , m / h h _g V _m V _p h _g V _m V _p 1720-2020 132 25.3 16.3 220 19.5 15.6 202 26.3 19.1 +53.0 +3.9 +17.2 -8.9 +34.9 +22.4 2020-2300 84 15,2 8.8 138 13.9 9.9 112 20.6 11.7 +33.3 +35.5 +32.9 -23.2 +48.2 +18.2 2300-2750 48 12.5 4.7 107 10.0 6.3 98 17.7 8.3 +100.4 +41.6 +34.0 -9.2 +77.0 +31.7 Notes: 1) h _g , V _M , V _P - average values, respectively, of drilling for chiselling, mechanical and trip drilling speeds.
2) The signs “+” and “-” indicate an increase and decrease in the performance of bits.

Claims (1)

A downhole hydraulic motor, consisting of series-connected working sections, characterized in that the working sections are interconnected by a two-pin sub, providing the connection of two cases of heterogeneous engines with the possibility of placing a conical-splined coupling connecting the sections shafts inside the cavity of this sub.