CN2714796Y

CN2714796Y - Backflow proof ballseat

Info

Publication number: CN2714796Y
Application number: CN 200420010858
Authority: CN
Inventors: 冯波; 王隆慧; 李洪春; 刘汝福; 韩进; 蓝钢华; 边江; 金平
Original assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2004-05-18
Filing date: 2004-05-18
Publication date: 2005-08-03
Anticipated expiration: 2014-05-18

Abstract

The utility model discloses a backflow proof ball seat which is suitable for the measuring pipe column which has to inversely discharge the residual liquid of the fracturing, the acidizing, etc, of the oil extraction and the injection well. The backflow proof ball seat is composed that a main body and a ball seat are communicated with a plunger. The main body and the ball seat are communicated with the plunger through the fixing of the shearing nail. The middle part of the ball seat communicated with the plunger is provided with a communicating hole, the lower part of the ball seat is the reducing section, and a locking pawl is arranged on the reducing section through an anti-rotation pin. The lower part of the main body is provided with a saw-tooth buckle, and a hole is arranged on the position of the main body corresponding to the communicating hole. The utility model is communicated with an oil sleeve in the process of down placing the pipe column, and the pipe column can flush the well on the front side and the back side after arriving at the preset position. The oil pipe can be clogged to deter the backflow of the water in the lower layer after throwing a ball to the ball seat. The interference of the high pressure water in the lower layer to the inverse discharging of the residual liquid is avoided, and the residual working fluid is furthest eliminated.

Description

The anti counter-flowing ball seat

Technical field: the utility model relates to a kind of anti counter-flowing ball seat, is applicable to that the pressure break, acidifying etc. of oil recovery, water injection well must the measure tubing string of anti-row's raffinate.

Background technology: in the oil field operation construction, be used to recover the oil, tubing string lower end such as pressure break of water injection well, acidifying must use ball seat to satisfy the requirement that well-flushing, sealing were gone into the well, returned to tubing string, simultaneously the technological requirement ball seat tubing string go into the well the process oil jacket be communicated with and well cleanout and reverse cleanout at any time, stopping up oil pipe from the bottom simultaneously behind packer setting stops lower layer of water to enter wherein, avoid of the interference of lower floor's water under high pressure, reduce of the pollution of residual working solution to greatest extent the stratum to the anti-row of raffinate.And the requirement that the on-the-spot at present common ball seat that uses does not reach construction technology, can occur pressure when stressor layer is high instantly pours in down a chimney, thereby disturbs the anti-row of target zone work raffinate.

Summary of the invention: the purpose of this utility model is exactly the problem that exists at ball seat in the measure tubing string site operation, and a kind of anti counter-flowing ball seat is provided.

The purpose of this utility model is achieved in that the anti counter-flowing ball seat is communicated with piston and is formed by main body, ball seat, main body is communicated with piston with ball seat and fixes by shear pin, the upper surface that ball seat is communicated with piston is the conical surface, the middle part has intercommunicating pore, have sealing ring on the intercommunicating pore, it is the undergauge section that ball seat is communicated with lower part of piston, has bound the lock pawl by stop pin on the undergauge section, lock pawl external diameter is the logical button of zigzag, and what ball seat was communicated with piston is band tapering hole enlargement head bottom; The bottom of main body is provided with the zigzag button, is communicated with ball seat on the main body on the corresponding position of intercommunicating pore on the piston to have the hole.

The utility model by main body be communicated with ball seat piston on the hole be communicated with, guaranteed recover the oil, oil jacket in the process pipe strings such as the pressure break of water injection well, acidifying is communicated with, but tubing string well cleanout and reverse cleanout behind the precalculated position, after packer setting is finished in the sealing of pitching tubing string, ball seat is communicated with the piston pawl of locking and locks with lower body part, so just, stop up oil pipe stop lower layer of water on return and enter wherein, avoid of the interference of lower floor's water under high pressure to the anti-row of raffinate, to guarantee to get rid of to greatest extent residual working solution, have simple in structure, easy to use, withstand voltage advantages of higher.

Description of drawings: Fig. 1: the utility model structural representation; Fig. 2: the utility model working state figure;

Among the figure: 1-shear pin, 2-ball seat are communicated with piston, 3-main body, 4-intercommunicating pore, 5-intercommunicating pore, 6-lock pawl, 7-anti-rotation pin;

The specific embodiment: as shown in Figure 1, the anti counter-flowing ball seat is communicated with piston 2 and is formed by main body 3, ball seat, main body 3 is communicated with piston 2 with ball seat fixing by shear pin 1, the upper surface that ball seat is communicated with piston 2 is the conical surface, the middle part has intercommunicating pore 5, have sealing ring on the intercommunicating pore 5, the bottom that ball seat is communicated with piston 2 is the undergauge section, on the undergauge section, lock pawl 6 is housed by anti-rotation pin 7, lock pawl 6 external diameters are the logical buttons of zigzag, what ball seat was communicated with piston 2 is band tapering hole enlargement head bottom, and for the ease of dismounting, the bottom that is communicated with piston 2 at ball seat has the dismounting internal thread.The bottom of main body 3 is provided with the zigzag button, has hole 4 on the main body 3 with on the intercommunicating pore 5 corresponding positions.

During use the anti counter-flowing ball seat being connected to the measure tubing string makes oil jacket be communicated with bottom, guarantee that the tubing string process oil jacket of going into the well is communicated with balance and goes into the well smoothly, under the tubing string behind the design attitude because oil jacket is communicated with, can select positive and negative well-flushing to finish the preliminary treatment work of pit shaft before the construction, instrument.Dropping into sealed steel ball from oil pipe is seated on the sealing cone that ball seat is communicated with piston 2 upper ends tubing string is sealed.The pressurization of well head oil, ball seat is communicated with piston 2 and is communicated with main body 3 relative displacement shear pins 1 and is cut off, it is descending that ball seat is communicated with piston 2, intercommunicating

pore

4 and 5 is not communicated with, and locks pawl 6 simultaneously and locks together only import but no export with main body 3 bottom sawtooth snap fit, because ball seat is communicated with piston 2 tapering hole enlargement head effect bottom, the seat of pushing the ball on the strata pressure is communicated with seizure of piston, make strata pressure high more, the pawl snap close just blocks firmly more, as shown in Figure 2.Make lower layer of water can't enter oil pipe, avoided of the interference of lower floor's pressure the anti-row of target zone raffinate.

Claims

1, a kind of anti counter-flowing ball seat, it is characterized in that: it is communicated with piston (2) and is formed by main body (3), ball seat, main body (3) is communicated with piston (2) with ball seat fixing by shear pin (1), the upper surface that ball seat is communicated with piston (2) is the conical surface, the middle part has intercommunicating pore (5), has sealing ring on the intercommunicating pore (5), and the bottom that ball seat is communicated with piston (2) is the undergauge section, by anti-rotation pin (7) lock pawl (6) is housed on the undergauge section, the external diameter of lock pawl (6) is the logical button of zigzag; What ball seat was communicated with piston (2) is band tapering hole enlargement head bottom; The bottom of main body (3) is provided with the zigzag button, and main body (3) upward and on the corresponding position of intercommunicating pore (5) has hole (4).