Straddle oil testing and refracturing tool system
A technology of repeated fracturing and tools, applied in the directions of sealing/isolation, production fluids, wellbore/well components, etc., can solve the problems of packer failure, inability to span production, and heavy construction work, reducing the The probability of error action, the effect of simplifying wellhead operation procedures and improving work effectiveness
Active Publication Date: 2019-10-15
弗润联科(北京)石油科技有限公司
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Problems solved by technology
[0003] In order to achieve the above purpose, the known process and tool system need to be lowered into a multi-stage packer and control sliding sleeve system, and the corresponding sliding sleeve of each layer is controlled layer by layer by means of ball throwing, steel wire or coiled tubing operation. For multi-layer oil and gas wells, the number of running tools is relatively high, the construction work volume is large, and the construction operation period is long, and there are too many drilling tools that are prone to sand sinking and sticking. Not suitable, nor suitable for use in open hole sections
[0004] There are known techniques that use layer-by-layer cable bridge plugs or mechanical bridge plugs. However, each layer of operation requires at least two pipe strings. The workload is extremely high, the construction cost is extremely high, and the construction of horizontal wells is difficult or Unable to construct, not suitable for use in open hole sections
[0005] There is also known related technology that adopts the coiled tubing dragging method to realize multiple straddling operations layer by layer, but the setting pressure can only be provided for the packers through the throttle valve between the straddling packers, and the movement between tools Poor compatibility, prone to interference and misoperation, and can only be used for pump injection operations such as fracturing and acidification, and cannot be used for cross-separation mining. It is not suitable for layer-by-layer production test oil testing
Choke valves are prone to erosion for high sand volume operations, resulting in packer failure and pipe string breakage
[0006] There is also known related technology that uses two-way paired rubber cup packers to straddle the compartment, which can realize layer-by-layer spanning operations. It is always larger than the inner diameter of the casing, and is severely worn during the tripping operation. It is not suitable for deep wells and wells with complex structures, and it is also not suitable for tubing operations.
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[0040] Such as Figure 1-4 As shown, the spanning oil testing and refracturing tool system is mainly composed of a lift-and-release ball valve setting tool, an upper packer, a spanning center pipe tool, and a lower packer. It is a multi-purpose tool combination.
[0041] The lifting and releasing ball valve type setting tool is mainly composed of: upper joint 1, adjusting screw sleeve 2, spring 3, movable sleeve 4, torque pin 5, switch sleeve 6, blind plug 7, ball valve support 8, ball valve sealing seat 9, ball valve Rotating handle 10, ball valve 11, middle joint 12, lower joint 13 forms. Wherein, the adjusting screw sleeve 2, the spring 3, the movable sleeve 4 and the torque pin 5 form a switch action assembly. Ball valve support 8, ball valve sealing seat 9, ball valve handle 10, ball valve 11 and intermediate joint 12 form a ball valve assembly. The switch sleeve 6 and the lower joint 13 form a bypass pressure transmission channel assembly.
[0042] The upper packer i...
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The invention discloses a straddle oil testing and refracturing tool system. The system is formed by connecting a lifting and releasing type ball valve setting tool, an upper packer, a straddle central pipe tool and a lower packer. According to the straddle oil testing and refracturing tool system, the upper and lower high-performance expanding packers are connected in a lifting and releasing ballvalve and pressure transmission pipe mode, multiple times of setting / unsetting can be achieved, and the two packers can be controlled to be always in a setting state and an unsetting state. Straddlesealing can be achieved in the mode that simple tubular column lifting / releasing without ball injecting is combined with wellhead pressurizing / depressurizing operation, and all pass of an operating channel is kept. A conventional perforated pipe, a fracturing port and other instruments and tools can be adopted between the two packers, and the binding ability is high.
Description
technical field [0001] The invention relates to the technical field of well testing and completion and repeated acidizing fracturing in multi-layer oil and gas fields, in particular to a span-type oil testing and repeated fracturing tool system that can be set and maintained multiple times through oil pipes. Background technique [0002] Oil testing or acid fracturing in multi-layer oil and gas wells is an important means to achieve efficient development of oil fields, and can understand and utilize each reservoir section more effectively. This process technology is widely used in the oil and gas development process, mainly: temporary or permanent isolation of specific production layers, adjustment or plugging of oil production / water production / water injection layer profiles, suction and sampling testing of specific production layers, for Temporary cross-bridge plugging during workover operations, squeeze injection operations, temporary production packers when seeking produc...
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IPC IPC(8): E21B43/26E21B43/14E21B33/124E21B34/12
CPCE21B33/1243E21B34/12E21B43/14E21B43/26
Inventor郑松鹤谢巍孙威李海峰李公可王祝王健
Owner弗润联科(北京)石油科技有限公司