Completion method of horizontal well without inner pipe and plug-free graded cementing
A graded cementing and plug-free technology, applied in wellbore/well parts, earthwork drilling, sealing/isolation, etc., can solve the problems of rubber sleeve and formation wear, abrasion, rubber sleeve radial expansion, etc., to achieve Improve the pressure bearing capacity, increase the diameter expansion rate, and the effect of smooth inner diameter
Active Publication Date: 2017-02-08
青岛吉安泰耐磨密封材料有限公司
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Problems solved by technology
The disadvantage of the step cementing device is that after cementing, it is necessary to run down the drill to remove the accessories (plugs, sliding sleeves and blind plates) of the step cementing device one by one, so as to get through the inner channel of the pipe string.
However, during the running of the pipe string, the pressure is often unstable; in this case, the control method of the internal and external pressure difference is likely to cause mis-sealing of the packer, and this mis-sealing cannot be observed at the wellhead, resulting in Continue to forcibly run in and cause damage to the packer;
[0007] (4) The open hole packer lacks shoulder outburst protection, poor adaptability to expanding boreholes during setting, and is prone to blast damage; at the same time, affected by factors such as wellhead pressure and liquid column pressure changes, During sealing and cementing, the overall pipe string is always in the state of axial creep, and it is easy to cause damage to the rubber sleeve and the formation due to abrasion;
[0008] (5) One end of the open hole packer is a movable head, which is because the movable head must move axially with the bulge of the rubber tube during seating; this structure meets the requirements for the sealing of the rubber tube, but the During the entry process, if the pipe string is blocked during the downward pressure process due to sand settling or collapse, it will cause the movable head to move upwards, resulting in radial expansion and wear of the rubber tube;
[0009] (6) Closing the rubber plug and blind plug is salvaged twice, which increases the string up and down once, which affects the working time;
[0010] (7) When the closing rubber plug is pressed, it is difficult to completely scrape off the cement residue on the casing wall, which makes it difficult or even impossible to salvage the salvaged fish head on the top of the closing rubber plug due to the deposition of the gray plug, thus requiring drilling operations. Complicated construction and affects work timeliness
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[0065] The present invention will be further described below in conjunction with the accompanying drawings.
[0066] Horizontal well double-stage seal bumper fishable completion device, including no-drilling plug device, bumper rubber plug and fishing device, said no-drill plug device includes a cementing switch and a packer; the upper end of the cementing switch It is connected with the casing, the lower end of the cement injection switch is connected with the upper end of the packer, and the lower end of the packer is connected with the screen pipe.
[0067] The cement injection switch is a single-flow valve type cement injection switch. The check valve type cementing switch includes a check valve 1-2, a bump seat 14, a spring 3, a slip 4 and a cylinder between them, and the cylinder is an inner cylinder from inside to outside. 9. The upper joint 10 and the outer cylinder 11, the end of the upper joint 10 close to the one-way valve seat 1-2 is provided with a closing sleeve...
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The invention provides a horizontal well inner-pipe-free drilling-plug-free grading cementing well completion method. The well completion method includes the implementation steps of assembling a drilling-plug-free well completion device into a well completion pipe column, sealing an outer-pipe packer in an expanding mode, opening a cementing channel, carrying out circulating cementing to carry out well cementation, closing the cementing channel, and salvaging a drilling-free inner sleeve. Pigging can be smoothly completed, and damage to the pipe column in the drilling plug and well washing processes is avoided. According to the horizontal well inner-pipe-free drilling-plug-free grading cementing well completion method, the breakthrough development is obtained in the field of horizontal well uncased hole sand prevention well completion, the well completion technological level is improved, and the positive promoting effect on continuously high and stable yield of oil fields is achieved.
Description
technical field [0001] The invention relates to a petroleum well completion method, in particular to a stepwise cementing completion method for a horizontal well without an inner pipe and without drilling plugs. Background technique [0002] With the continuous deepening of oilfield development, measures to tap potential and increase efficiency are also further improved. In order to develop thin oil layers, there are more and more wells with special techniques such as horizontal wells and highly deviated wells, and various well completion methods have emerged as the times require. At present, in the horizontal well completion technology, in order to make the oil layer have a larger exposed area, avoid the damage of the cement slurry to the oil layer, and effectively protect the oil and gas layers, the precision sand filter tube completion method is often used. This completion method requires the staged cementing process of cementing at the top of the screen during the drill...
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IPC IPC(8): E21B33/13
Inventor史志升史明慧马启富郭闻
Owner青岛吉安泰耐磨密封材料有限公司