A new type of compound plugging removal acidizing pup joint
A pup joint and plugging removal technology, which is applied in the direction of drill pipe, casing, wellbore/well parts, etc., can solve the problems of poor safety and environmental protection, large dosage, and the impact of concentration drop, so as to achieve efficient use, avoid excessive use, cost reduction effect
Active Publication Date: 2019-04-02
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0003] In view of this, the present invention aims to propose a new type of composite plugging removal and acidification nipple, which solves the problems of poor safety and environmental protection in the use of acid liquid, large dosage, and the effect of acidification when the concentration drops in the composite plugging removal of oil and gas wells. Operate risks and costs to achieve the purpose of improving plugging removal effect
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[0020] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0021] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be interpreted...
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The present invention provides a novel composite blockage removal acidizing pipe nipple which comprises a pipe nipple main body, an upper baffle plate and a lower baffle plate; the pipe nipple main body is a hollow cylinder; the upper baffle plate is disposed at an upper portion of the inside space of the pipe nipple main body; the lower baffle plate is disposed at a lower portion of the inside space of the pipe nipple main body; a sealed cavity is formed between the upper baffle plate and the lower baffle plate; a side wall of the pipe nipple main body is provided with a deflection through hole; the deflection through hole is disposed over the horizontal plane where the upper baffle plate is located; the side wall of the pipe nipple main body is also provided with a first valve; and the upper baffle plate is provided with a plurality of second valves. According to the novel composite blockage removal acidizing pipe nipple, acid liquid is isolated and stored in the sealed cavity, and application is targeted to the strata. Excessive application of the acid liquid can be prevented, cost is reduced. The acid liquid can be efficiently used, and environmental pollution can be effectively prevented. The acid liquid in the sealed cavity is isolated from other liquid in a well, and the acidizing effect is prevented from being influenced by concentration decrease.
Description
technical field [0001] The invention belongs to the field of petroleum drilling, and in particular relates to a novel composite plugging-removing acidizing nipple. Background technique [0002] In the process of oil and gas development, in order to obtain more oil and gas production, processes such as perforation, fracturing, and acidification are usually used to treat the bottom layer to open and expand the gaps in the production layer. With the development of the development of the production layer, the crevices of the production layer will often be blocked to reduce oil and gas production, so plugging removal operations are required. General plugging removal operations are divided into two categories, physical plugging removal and chemical plugging removal. It is difficult to achieve a satisfactory plugging removal effect by using one alone. At present, there has been a physical-chemical composite plugging removal process-first hydraulic shock treatment, so that the oil l...
Claims
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IPC IPC(8): E21B17/02E21B43/27
CPCE21B17/02E21B43/26
Inventor 贾红战曹骕骕张耕培邱晓宁张苏周俊然
Owner BC P INC CHINA NAT PETROLEUM CORP