Device for drilling agent degassing

FIELD: oil and gas production.

SUBSTANCE: device for drilling agent degassing consists of degassing chamber, of its cover, of float and of aerator. The degassing chamber is made as vertically elongated structure and consists of two coaxial vertically oriented pipes of different diameters: an upper one - of bigger diameter and a lower one - of smaller diameter. On a lower end of the lower pipe there is present non-uniformity in shape of meander around circumference in section of the end part of the lower pipe. The aerator is positioned inside the lower pipe from the lower end and has diameter less, than diameter of the lower pipe. The cover of the degassing chamber has four ports for release of excess pressure, for sampling of analysed product, for connection with an inlet of a compressor and for connection to the channel for the aerator.

EFFECT: reduced weight and dimension at reduced cost and expanded functionality of implementation under various conditions including reservoirs of drilling rigs of low capacity.

3 cl, 1 dwg

 

The invention relates to gazoneftedobyvayuschie industry, namely, devices gas logs in the process of drilling oil and gas wells, in particular, for selection to the analysis of the gas mixture for gas logs.

The known device for degassing drilling mud using degaser structures of different types [author's certificate SU for inventions№124384, №269875, №328247, №512446, №535414, №1479035, №1542567 and patents RU invention№2156152, №2271434, №2276249]. Float, screw and vibratory degassers are installed in the conduit through which flows the drilling fluid flowing from the well. The distance between the crystallizer and the mouth of the well should be kept to a minimum and is determined by technological conditions. The problem is that degasser caught a large part of the gases of mud.

However, a significant proportion of these degaser allows to capture only a portion of the gases being free and dissolved States in the mud. A significant portion of the free gas is lost in the wellhead at the time of exit of the solution, and also on the way from the wellhead to the degasser.

Disk degasser is designed to capture free gas at the exit of the solution on the surface. Serious interference with this degase the ora cause viscous solutions.

Of greatest interest degassers float type.

A device for degassing drilling mud float type, designed for continuous selection of free gas from part of the flow of the drilling mud out of the well [http://www.geosferatver.ru/gaz/dp-1/dp-1.php]. The degasser is made of sheet stainless steel and includes a housing mounted on two cylindrical floats with the possibility to adjust the depth of immersion in the drilling fluid. On the housing mounted radiator type heat exchanger for condensing vapors of the drilling fluid inside the degasser and the means for its attachment to the vessel wall. The geometrical characteristics of the degasser provide buoyancy in drilling fluids of different density. In the case of the degasser has a hole for the connection of gas chamber with the atmosphere, necessary for equalizing the pressure inside and outside the camera. To improve the allocation of gas from solution degasser is equipped with plate dividers in the form of a comb that is installed inside the housing perpendicular to the traffic flow. The principle is based on the allocation of gas bubbles from the surface layers of the drilling fluid passing through the plate dividers of the degasser, and removal of the resulting gas mixture by vacuum, creating what imago pump system to transport the gas mixture, installed in the station geotechnical research wells. The amount of degassing chamber 3 DM3. The surface area of the degassing 0.1 m2. Adjustable depth 35 mm Length of the degasser 740 mm width 390 mm, height 230 mm, Weight of the degasser - 6,2 kg

Also known float degasser [Pomerantz LI Gas logs. M.: Nedra, 1982. P.57], consisting of a body of the working chamber made of stainless steel and mounted on foam floats on which it floats in the stream of drilling fluid (mud). Float degasser is installed at the wellhead and is fixed in the vessel with the help of stretch marks. Installation of the degasser on floats ensures a constant position of the working chamber float degasser regarding the level of mud in the tank, i.e. the constancy of the relationship magazinemore volume of mud to the volume of the gas phase in the chamber of the degasser. The lower part of the body of the float of the degasser is open at the front. Inside the housing perpendicular to the direction of mud flow mounted partitions with slits, resulting in fragmentation of mud flow and a slight increase in the contact surface degirolamo mud with air in the working chamber of the degasser. In the front of the case features a visor with holes to allow air in the working chamber. On the top of the case has loves the a-sump with pressure feed gas mixture from the degasser in the gas line.

The disadvantage of the above-described analogs are not always acceptable increased size that does not allow the degassing process in containers of small volume, and low coefficient of degassing 1-2%.

The closest analogue to the claimed invention is a float degasser with an integrating circuit [Pomerantz LI Gas logs. M.: Nedra, 1982. Pp.61-62, and inventor's certificate SU for the invention №566223 on this same model]. The degasser is a degassing chamber in stainless steel, suspended by steel pontoons pontoon type with accessories that make it possible to regulate the position of the degassing chamber in relation to the level of the mud flow in the vessel. At the bottom of the camera mounted unit aerator connected to a portable compressor unit. Block aerator is a sealed chamber with a lid in the form of a membrane of nepristoinoi rubber or several parallel-connected to the compressor tubes from nepristoinoi rubber. In the membrane and the aerator tubes are made in increments of 2 mm 2000 holes. In the upper part of the degassing chamber has a cone reflector splashing mud and fitting to turn on the aerator in the integrating circuit. The cone is mounted fitting for connecting the degassing chamber to the hydraulic shutter, ensuring that the camera is Bolshogo excess pressure. The principle of operation of this float degasser is that the gas mixture extracted from the mud in the chamber of the degasser, continuously circulates in the integrating circuit, frequently in the form of ≈2000 bubbles barbthroat through the mud in the chamber of the degasser and continuously enriched gas extracted from the mud by these bubbles. With increasing pressure in the chamber of the degasser excess of the gas mixture through the water seal is removed from the camera, and restores the specified overpressure.

However, as in the aforementioned analogues, the degasser is different elevated size, which does not always allow him to work with modern equipment drilling rigs, since the size of data degaser incompatible with the size of the nodes in the first place, with pockets of shale shakers rigs.

The task of the invention is to reduce the weight, dimensions of the device for degassing drilling mud while reducing the cost and expanding the possibilities of its use in different conditions, including capacity drilling rigs small amounts.

The essence of the proposed solution lies in the fact that the device for degassing drilling mud, characterized by the presence of the float, which divides the device on the top - above the float part and the bottom - under the float is submerged part of degusa the ion chamber, made in the form of a vertically elongated structure consisting of two coaxial vertically oriented pipes of different diameters: the upper larger diameter located above the float, and the lower smaller diameter, located in the submerged part, the lower pipe is made with the possibility of entering the top inside of upper tube part of the volume occupied by the lower part of the upper tube; the bottom edge of the submerged portion of the lower tube has a heterogeneity in the form of a meander, made around the circumference of the cross section of the end portion of the lower tube; inside the lower pipe from the bottom edge placed aerator with a diameter less than the diameter of the lower pipe, between which and the side wall of the bottom the tube has a circular clearance; degassing chamber has a cover, which made at least four ports for: relieving excess pressure, selection on the analysis of the investigated product, the connection with the inlet of the compressor and connected to a channel on the aerator.

Applying the device for degassing drilling mud with the above-described characteristics, in which the aerator has a spherical shape and is made of ceramic crumbs.

Moreover, there is a device for degassing drilling mud with the above-described characteristics, in which the float is made of Styrofoam, wrapped fiberglass, over which caused protect the interest impregnation.

The technical result of the proposed solutions is achieved by changing the geometry of the nodes, materials, devices for degassing drilling mud, produced of nodes (one with an updated, others with very different geometry) component parts in comparison with the closest analogue. The proposed solution is to design the degasser in the form of two round vertically elongated bodies type tubes placed one coaxial another, each other and with a specific output of one of the pipe beyond the other in their end parts in the middle part of the degasser, which has a float, and a diffuser with a specific structure and form of a spherical porous ceramic body, as well as clearance from the bottom of the final part of the lower pipe in the form of a meander along the contour of the lower circular section.

The claimed invention is illustrated with a drawing, which shows a General view of the degasser. In the drawing positions 1-14 mark:

1 - degassing chamber;

2 - cover;

3 - float;

4 - top tube;

5 - lower pipe;

6 - meander;

7 - aerator;

8 - port for connecting to the channel on the aerator;

9 - channel aerator;

10 - port for relieving excess pressure;

11 port for selection to the analysis of the investigated product;

12 - port for connection with the inlet of the compressor;

14 - stem mounting.

Device for degassing drilling mud has a degassing chamber 1 with the cover 2 and the float 3, which divides the device on the top - above the float 3 - part and the bottom - under the float 3 - submersible part. The latter is made of Termodinamika material - foam-wrapped fiberglass, over which caused impregnation, preventing aggressive influence of mud on the material of the float 3. Degassing chamber 1 is made in the form of a vertical elongated structure consisting of two coaxial vertically oriented pipes 4, 5 of different diameters, the top 4 of larger diameter located above the float, the bottom 5 of a smaller diameter is located in the submerged part. The lower pipe 5 degassing chamber 1 is made with the possibility of entering the top inside of upper tube 4 on the part of the volume occupied by the lower part of the upper tube 4. On the lower edge of the submerged part of the lower pipe 5, there is heterogeneity in the form of a meander 6 made of a circle in cross section of the end portion of the lower pipe 5. Inside the bottom of the pipe 5 from the bottom edge placed aerator 7 spherical shape, made of ceramic chips with a diameter less than the diameter of the lower pipe 5 degassing chamber 1. Between the diffuser 7 and the side wall of the lower pipe 5, there is an annular gap. In the cover 2 degassing camera 1 to perform the ENES, at least four port - 8, 10, 11, 12, respectively, for connecting 8 to channel 9 on the aerator 7, reset 10 overpressure, selection 11 on the analysis of the investigated product, the connection 12 to the input of the compressor.

Within the volume degassing chamber installed the holders 13, ensuring the centering of the pipes 4, 5 and does not allow to break the symmetry in the orientation of the elements within the degassing chamber 1. The rod mount 14 also serves to effect the fastening elements, in particular the cover 2 degassing chamber 1, and put up outside.

Device for degassing drilling mud works as follows.

When switching on the compressor (in the drawing, the compressor is not shown because it is not included in the number of nodes constituting the inventive device) starts the pump (pumping) of the gas mixture from the degassing chamber 1 with mud. At the same time there is a discharge of the gas mixture or air depending on the amount of gas in the mud, called degassing chamber 1 through the mud column, for example spherical diffuser 7 of the ceramic chips. Such movement of the gas mixture from the degassing chamber 1 into the compressor and from the compressor in the degassing chamber 1 mentioned above through characteristic of not only declared, but also for other, previously existing, devices for degassing drilling mud (see Orange is C LI Gas logs. M.: Nedra, 1982. P.62). The mentioned structural elements forming the circuit: compressor port 8 - aerator 7 - pole PJ - port 10 - compressor form an integrating circuit, which continuously circulates the gas mixture which is enriched with each cycle or depleted depending on the saturation of the mud at this point in time. Despite the fact that the column of mud is not a structural element, it is an important connecting link in this closed system is an integrating circuit that provides the main work and the function of the device. Bubbling mud occurs in the lower pipe 5 degassing chamber 1 through the entire column of liquid in the volume of the lower pipe 5.

The distinction of the proposed solution at this stage of the operation of the device is specially designed ports - input and output that are installed directly in the cover 5 degassing chamber 1. Float degassers with such caps are not found in the search process when preparing the application.

Mud, moving by volume, where the device gets into the zone of cavitation aerator 7 6 meander, through the initial formation of bubbles on its sharp edges. The compressor creates pressure in the diffuser 7 and, thereby, causes the mud to rise from the bottom edge of the immersion of the device in the top, where the going is it the main mud degassing, accompanied by overflow through the top edge of the submerged part of the lower pipe 5.

Bubbles of gas contained in the mud, are connected with large bubbles moving along the submerged part of the up, where the overflow of mud over the edge they collapse, releasing gas in the upper part of the upper pipe 4 degassing chamber 1. Degassing chamber 1 through one of the ports 12 of the cover 2 is connected with the input of the compressor, which ensures the continuity of the degassing process. Excess pressure without disturbing the operation of the device, is discharged into the atmosphere through the port for relieving excess pressure 10. From degasification chamber 1 through the port 11 is the selection of the gas mixture to be analyzed. The input port of the integrating circuit 8 is used to connect to the channel 9 to the aerator 7.

Examples.

The invention is implemented in the experimental samples made at one of the enterprises, Saratov. They represent sets of corresponding pairs of tubes, the lower and upper with respective to each other in size, for example: the length of the upper pipe 160 mm, the diameter of the upper pipe of 110 mm, a length of the lower pipe 90 mm, the diameter of the lower pipe - 135 mm pipe Material is polypropylene. The thickness of the float 50 mm, width float - 160-165 mm, length float - 290 mm and, if necessary, more. Step meander - 20÷30 mm Product preparing for the practical is tion testing. Found constructive improvements virtually grounded, the samples made the above changes, which justified their constructive expediency.

1. Device for degassing drilling mud, characterized in that it has a float that divides the device on the top - above the float part and the bottom under the float is submerged part of the degassing chamber made in the form of a vertically elongated structure consisting of two coaxial vertically oriented pipes of different diameters: the upper larger diameter located above the float, and the lower smaller diameter, located in the submerged part, the lower pipe is made with the possibility of entering the top inside of upper tube part of the volume occupied by the lower part of the upper tube; the bottom edge of the submerged portion of the lower tube has a discontinuity in the form of a meander, made around the circumference of the cross section of the end portion of the lower tube; inside the lower pipe from the bottom edge placed aerator with a diameter less than the diameter of the lower pipe, between which and the side wall of the lower tube has a ring gap; degassing chamber has a cover, which made at least four ports for: relieving excess pressure, selection on the analysis of the investigated product, the connection with the inlet of the compressor and connected to the channel is on the aerator.

2. Device for degassing drilling mud according to claim 1, characterized in that the diffuser has a spherical shape and is made of ceramic crumbs.

3. Device for degassing drilling mud according to claim 1, characterized in that the float is made of Styrofoam, wrapped fiberglass, over which is applied a protective impregnation.



 

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