CN105422020B - Oil drilling sleeve wear-resistant connector - Google Patents

Abstract

Casing anti-friction joints for oil drilling, including casing anti-friction joint main body, upper retaining ring, anti-friction sheath, lower retaining ring screws, lower retaining ring. There are threads, and the middle part of the outer circle is equipped with an upper retaining ring, an anti-wear sheath, and a lower retaining ring in sequence from top to bottom. The wear-resistant sheath is composed of two parts: the wear-resistant body and the core of the wear-resistant sheath. The wear-resistant sheath is equipped with lubrication and cooling channels distributed along the circumference of the wear-resistant sheath. Grind on the main body of the joint. The structure is simple, the reliability is high, the operation is convenient, the cost is low, and the service life is long. The application of the present invention reduces drilling risks and production costs.

Description

Casing anti-wear joints for oil drilling

technical field

The invention relates to the anti-wear technical field of drilling tools in the oil industry, in particular to casing anti-wear joints for oil drilling.

Background technique

During the oil drilling process, the drilling tool will generate friction between the wellbore and the casing or the well wall, which will increase the drilling torque and friction resistance, and cause casing wear. When drilling deep wells, ultra-deep wells, horizontal wells and extended-reach wells In some cases, the problems of excessive drill string torque and casing wear are particularly prominent. Long-term friction will cause downhole accidents such as pipe sticking, lost circulation, and oil and gas leakage at the wellhead, or even failure to drill. It is the best way to prevent casing wear and reduce drilling torque by connecting casing anti-wear nipples in drilling tools.

The current conventional casing anti-wear joints can realize the anti-wear effect on the casing under normal well conditions, but they cannot meet the requirements for use in highly abrasive formations and complex wellbore conditions. The conventional casing anti-wear joints The anti-wear sheath has poor wear resistance, and there is no anti-wear sheath to lubricate the cooling channel, which makes it wear quickly, and the anti-wear sheath is easy to fall off during the process of pulling the drill string, resulting in downhole accidents.

Contents of the invention

In order to solve the above existing problems, the present invention provides a casing wear-resistant joint for oil drilling. The main body of the casing wear-resistant joint is in the shape of a circular tube, with threads processed at both ends, and the diameters of the middle and lower parts of the outer circle change sequentially Small, the middle part of the outer circle is equipped with an upper stop ring, an anti-wear sheath, and a lower stop ring in sequence from top to bottom, and the lower stop ring is fixed on the main body of the casing anti-wear joint by the lower stop ring screw. The anti-wear sheath is composed of two parts: the wear-resistant body of the anti-wear sheath and the core of the anti-wear sheath. The anti-wear sheath is equipped with lubricating and cooling channels uniformly distributed along the circumference. The structure is simple, the reliability is high, the operation is convenient, the cost is low, and the service life is long. The application of the present invention reduces drilling risks and production costs. The object of the present invention is to provide a casing wear-resistant joint for oil drilling.

The present invention is achieved through the following technical solutions.

The anti-friction joint of the casing for oil drilling includes the main body of the anti-friction joint of the casing, an upper retaining ring, an anti-friction sheath, a lower retaining ring screw, and a lower retaining ring.

The main body of the casing wear-resistant joint is a circular tube, with threads processed at both ends. The diameters of the middle and lower parts of the outer circle become smaller in turn, forming two steps on the outer circle. The middle part of the outer circle is sequentially equipped with upper stops from top to bottom. Ring, anti-wear sheath, lower stop ring, the outer circular surface of the corresponding part where the wear-resistant sheath is installed is anti-wear, and the corresponding part of the lower stop ring is processed with uniformly distributed radial threaded blind holes, and the upper stop The ring is in the shape of a round tube, the upper outer circle and the lower inner hole have chamfers, the lower inner hole chamfers are treated with anti-wear, and the inner hole interference fit is fixed with the main body of the casing anti-wear joint. Step positioning, the anti-wear sheath is a round tube, with chamfers on the upper and lower ends of the outer circle, which are respectively matched with the chamfers of the lower inner hole of the upper retaining ring and the upper inner hole of the lower retaining ring, and the anti-wear sheath and There are appropriate gaps between the upper retaining ring, the main body of the casing anti-wear joint, and the lower retaining ring. The anti-wear sheath is provided with anti-wear sheath lubrication and cooling channels uniformly distributed along the circumference. On the wear-resistant body of the grinding sheath, the starting point and the ending point are at the upper end and the lower end respectively, and the middle part is distributed axially or helically on the inner wall. etc., its cross-sectional shape is semicircular, rectangular, triangular, etc. The wear-resistant sheath is combined by the wear-resistant sheath wear body and the wear-resistant sheath core, and the wear-resistant sheath wear body connects the wear-resistant sheath The core is covered inside, and the wear-resistant body of the wear-resistant sheath is made of wear-resistant materials. The wear-resistant materials can be composite materials such as polyurethane or polytetrafluoroethylene, molybdenum disulfide, copper powder, etc. It is in the shape of a circular tube, with uniformly distributed holes in the radial direction, which are used to increase the bonding force with the wear-resistant body of the wear-resistant sheath. The wear-resistant sheath is formed by a mold. The outer circle and the upper inner hole have chamfers, and the upper inner hole chamfers are treated with anti-wear, and the inner hole is in clearance with the main body of the casing wear-resistant joint. The lower retaining ring screw in the hole is fixed to the main body of the casing wear-resistant joint as a whole.

The anti-friction joint of the casing used for oil drilling is connected to the drill string through the upper and lower ends of the thread, and the mud channel is connected, and normal drilling, tripping and other operations can be carried out. In the process of oil drilling, the casing anti-wear joint used for oil drilling converts the friction between the drilling tool in the wellbore and the casing or the well wall into the main body of the casing anti-wear joint, the upper retaining ring, the lower retaining ring and the anti-wear The friction between the sheaths is due to the fact that the wear-resistant body of the wear-resistant sheath is made of wear-resistant material, and the corresponding parts of the casing wear-resistant joint body, upper retaining ring, and lower retaining ring that match the wear-resistant sheath have been treated with anti-wear , the friction coefficient is less than 0.1, which greatly reduces the drilling torque and frictional resistance, and minimizes the wear on the casing. Occurrence of downhole accidents such as oil and gas leakage.

The invention has the following advantages: the anti-wear sheath of the oil drilling casing anti-wear joint is provided with anti-wear sheath lubricating and cooling channels uniformly distributed along the circumference, and the anti-wear sheath lubricating and cooling channels are located in the wear-resistant sheath On the body, its starting point and end point are at the upper end and the lower end respectively, and the middle part is on the inner wall, which fully lubricates and cools the friction surface. Corresponding parts of pipe anti-friction joint main body, upper retaining ring and lower retaining ring have been treated with anti-friction, and the friction coefficient is less than 0.1, which greatly reduces the drilling torque and frictional resistance, and minimizes the wear on the casing. The structure is simple, the reliability is high, the operation is convenient, the cost is low, and the service life is long. The application of the present invention reduces drilling risks and production costs.

Instructions attached

Figure 1: Schematic diagram of casing wear-resistant joints for oil drilling

Figure 2: Enlarged Schematic Diagram of Wear Sheath

Description of drawings: 1. Casing anti-wear joint main body 2, upper stop ring 3, wear-resistant sheath 4, lower stop ring screw 5, lower stop ring 6, wear-resistant sheath wear body 7, wear-resistant sheath core Body 8. The anti-wear sheath lubricates the cooling channel.

detailed description

The present invention will be further described in conjunction with Figure 1 and Figure 2 of the accompanying drawings.

Example 1:

The casing wear-resistant joint for oil drilling includes a casing wear-resistant joint main body 1 , an upper stop ring 2 , a wear-resistant sheath 3 , a lower stop ring screw 4 , and a lower stop ring 5 .

The main body 1 of the casing wear-resistant joint is a circular tube with threads processed at both ends. The diameters of the middle and lower parts of the outer circle become smaller in turn, forming two steps on the outer circle. The middle part of the outer circle is sequentially equipped with upper The retaining ring 2, the wear-resistant sheath 3, and the lower retaining ring 5 are treated with anti-wear on the outer circular surface of the corresponding part where the wear-resistant sheath 3 is installed, and uniformly distributed radial grooves are processed at the corresponding part of the lower retaining ring 5. Threaded blind hole, the upper retaining ring 2 is a circular tube, the upper outer circle and the lower inner hole have chamfers, the lower inner hole chamfers are treated with anti-wear, and the inner hole interference fits with the main body of the casing anti-wear joint 1 is fixed as a whole and is positioned by the upper step. The anti-wear sheath 3 is a circular tube with chamfers on the upper and lower ends of the outer circle, which are respectively chamfered with the inner hole of the lower part of the upper retaining ring 2 and the inner hole of the upper part of the lower retaining ring 5. The hole chamfers are matched, and there are appropriate gaps between the wear-resistant sheath 3 and the upper retaining ring 2, the casing wear-resistant joint main body 1, and the lower retaining ring 5. The wear-resistant sheath 3 is provided with 6 holes uniformly distributed along the circumference. A wear-resistant sheath lubricating cooling channel 8, the anti-wear sheath lubricating cooling channel 8 is located on the wear-resistant sheath wear body 6, its starting point and end point are at the upper end and lower end respectively, and the middle part is distributed in a right-handed spiral on the inner wall, Its helix angle is 30°, and its cross-sectional shape is semicircular. The wear-resistant sheath 3 is combined by the wear-resistant sheath wear body 6 and the wear-resistant sheath core 7. The wear-resistant sheath wear body 6 Wrap the wear-resistant sheath core 7 inside it, the wear-resistant sheath wear-resistant body 6 is a wear-resistant material—polyurethane, the wear-resistant sheath core 7 is a circular tube, and its radial direction has Uniformly distributed holes are used to increase the bonding force with the wear-resistant sheath wear body 6. The wear-resistant sheath 3 is formed by a mould, and the lower stop ring 5 is a circular tube, and the outer circle of the lower part and the inner hole of the upper part have inverted The inner hole of the upper part is chamfered with anti-wear treatment, and the inner hole is matched with the main body of the casing anti-wear joint. The middle part of the axial direction is provided with holes uniformly distributed along the circumference in the radial direction, and the lower retaining ring screw in the hole is passed through. 4. It is fixed as a whole with the casing anti-wear joint main body.

Example 2:

The difference from the above example is that the anti-wear sheath 3 is provided with 8 anti-wear sheath lubricating and cooling passages 8 evenly distributed along the circumference, and the middle part of the anti-wear sheath lubricating and cooling passage 8 is on the inner wall, which is right-handed. distribution, its helix angle is 70°, its cross-sectional shape is rectangular, and the wear-resistant body 6 of the wear-resistant sheath is made of wear-resistant materials—polytetrafluoroethylene, molybdenum disulfide, copper powder, etc.

Example 3:

The difference from the above two examples is that the anti-wear sheath 3 is provided with four anti-wear sheath lubricating and cooling passages 8 evenly distributed along the circumference, and the middle part of the anti-wear sheath lubricating and cooling passage 8 is on the inner wall, which is left-handed. distribution, its helix angle is 60°, and its cross-sectional shape is triangular.

Example 4:

Different from the above three examples, the anti-wear sheath 3 is provided with five anti-wear sheath lubrication and cooling passages 8 uniformly distributed along the circumference, and the middle part of the anti-wear sheath lubrication and cooling passage 8 is on the inner wall, which is left-axis to the distribution.

Through the description of the above-mentioned embodiments, it is helpful for the public to understand the present invention. The scope of protection of the present invention is not limited to the above-mentioned embodiments. Technical scheme of the present invention.

Claims (3)

1. oil drilling sleeve wear-resistant connector, it is characterized in that including sleeve wear-resistant connector main body（1）, upper baffle ring（2）, anti-friction protecting Set（3）, lower baffle ring screw（4）, lower baffle ring（5）, sleeve wear-resistant connector main body（1）For a tubular, two ends are threaded, outside Circle middle part and two sections of bottom diameter diminish successively, two steps are formed on cylindrical, cylindrical middle part is sequentially arranged with from top to bottom Baffle ring（2）, anti-wear sheath（3）, lower baffle ring（5）, in dress anti-wear sheath（3）The periphery of corresponding position handled through abrasionproof, Load baffle ring（5）Corresponding position be machined with uniform radial direction tapped blind hole, upper baffle ring（2）For a tubular, its top is cylindrical There is chamfering with bottom endoporus, its underpart inner bore chamfering is handled through abrasionproof, its endoporus interference fit and sleeve wear-resistant connector main body（1） It is fixed as one, anti-wear sheath（3）For a circular tube shaped, upper and lower ends are cylindrical chamfering, respectively with upper baffle ring（2）Bottom endoporus Chamfering and lower baffle ring（5）Top inner bore chamfering be engaged, anti-wear sheath（3）With upper baffle ring（2）, sleeve wear-resistant connector main body （1）, lower baffle ring（5）Between have gap, anti-wear sheath（3）Provided with the anti-wear sheath lubrication passage being uniformly distributed along the circumference （8）, anti-wear sheath lubrication passage（8）Positioned at anti-wear sheath wear body（6）On, its beginning and end is respectively in upper end with End, center section is on inwall, anti-wear sheath（3）By anti-wear sheath wear body（6）With anti-wear sheath core body（7）It is combined into one Body, lower baffle ring（5）For a tubular, its underpart is cylindrical and top endoporus has chamfering, and its top inner bore chamfering is handled through abrasionproof, its Endoporus and sleeve wear-resistant connector main body（1）Gap coordinates, and axially middle part is radially provided with the hole being uniformly distributed along the circumference for it, by hole Lower baffle ring screw（4）With sleeve wear-resistant connector main body（1）It is fixed as one.

2. oil drilling sleeve wear-resistant connector according to claim 1, it is characterized in that anti-wear sheath lubrication passage （8）Distribution of the center section on inwall is in being axially or helically distributed, and the hand of spiral has left-handed and dextrorotation, its lead angle from 10 ° to 90 °, its cross sectional shape has semicircle, rectangle or triangle.

3. oil drilling sleeve wear-resistant connector according to claim 1, it is characterized in that, anti-wear sheath wear body（6）Will Anti-wear sheath core body（7）It is coated on inside it, anti-wear sheath wear body（6）For high-abrasive material, high-abrasive material is by polyurethane or poly- Tetrafluoroethene, molybdenum disulfide, copper powder composition, anti-wear sheath core body（7）For a tubular, its radial direction is provided with uniform hole.