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Stratified injection tubular pile

The technology of a pipe string and a poly-oil pipe, which is applied in the field of polymer flooding oil production, can solve the problems of unmeasurable flow rate and viscosity, blockage of a single pipe, and difficulty in casting and fishing, so as to reduce the serious shear degradation of the polymer and reduce the delamination. Error, the effect of real and reliable data

Inactive Publication Date: 2010-10-13
SINOPEC SHENGLI OILFIELD
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Problems solved by technology

[0008] The main purpose of the present invention is to solve the above problems, and for this reason, the technical idea of ​​surface diversion, metering and sampling has been determined, that is, the wellbore uses concentric double-pipe large-diameter pipe strings to transport polymer solution in layers to solve single-pipe blockage and corrosion. For the problem that it is not easy to throw and fish, use a flowmeter on the ground to directly measure and sample in layers to measure the flow and viscosity, which solves the problem that the flow and viscosity cannot be measured when a single pipe is injected.

Method used

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Embodiment Construction

[0029] like figure 1 and figure 2 As shown, the layered polymer injection string of the present invention includes a polymer injection tubing for transporting polymer solution, wherein the polymer injection tubing further includes an outer polymer injection tubing 15 and an inner polymer injection tubing built in the outer polymer injection tubing 15. The oil pipe 16 and the inner flow channel 25 and the outer flow channel 26 leading to different oil layers are respectively formed in the inner poly oil injection pipe 16 and the annular space between the inner poly oil injection pipe 16 and the outer poly oil injection pipe 15 . Compared with the prior art, due to the use of double flow channels to divide the flow on the ground, problems such as blockage and difficult fishing caused by the use of downhole distributors are eliminated.

[0030] The lower end of the inner channel 25 communicates with the lower poly-injected oil layer 21 through a close-fitting compensator. The ...

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Abstract

The invention provides a hierarchical pouring polymer tube column which can avoid blocking and difficult cast. The tube column includes the out pouring oil tube and the inner pouring oil tube set in the out pouring oil tube, the inner / outer flow passage connected to the different oil layer in the inner pouring ploy oil tube and between the inner and out tube. The top of the inner and outer flow passage are connected with the pump station by the pouring polymer controlling device. The inner flow passage is connected with the oil layer by the closed interpolator and the outer flow passage is connected with the oil layer by the big duct sieve vessel. The pouring control device is the low sheared valve. The invention can be used in the hierarchical pouring oil extraction production.

Description

technical field [0001] The invention relates to the technical field of polymer flooding and production, in particular to a layered polymer injection string using concentric double pipes. Background technique [0002] At present, the polymer flooding recovery technology has become an important means of oilfield stable production. For oilfields with heterogeneous formations, the permeability between layers often varies greatly. Therefore, layered polymer injection technology and equipment are adopted in oilfield production practice in order to perform polymer injection on different oil layers in a targeted manner. [0003] In the current concentric single-tube layered polymer injection process, layered polymer injection is performed through a concentric single-tube layered string. The downhole part of the concentric single-pipe layered string includes a packer and an annular decompression groove injector. Wherein, the dispenser includes a distribution sleeve and a distribut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
Inventor 张国荣刘洋郑伟林顾永涛商祥毅常方瑞黄春彭寿斌
Owner SINOPEC SHENGLI OILFIELD
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