Classified acid pickling acidification method of horizontal well

A horizontal well and pickling technology, which is applied in the direction of earthwork drilling, wellbore/well parts, cleaning equipment, etc., can solve the problems of poor pertinence and unsatisfactory acidizing effect, and achieve the effect of simple structure and convenient on-site operation

Active Publication Date: 2018-05-29
PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a horizontal well graded pickling and acidizing method to solve the problems of poor pertinence and unsatisfactory acidizing effect in the prior art

Method used

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  • Classified acid pickling acidification method of horizontal well
  • Classified acid pickling acidification method of horizontal well
  • Classified acid pickling acidification method of horizontal well

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Embodiment Construction

[0020] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Specific embodiment one of the horizontal well staged pickling acidification method of the present invention, as figure 1 and figure 2 As shown, the staged pickling and acidizing method for horizontal wells includes completion strings and pickling strings. The completion string includes a liner hanger 1 and several sets of completion units 2. The number of sets of completion units 2 in the horizontal section is determined by the number of acidizing stages in the horizontal well; the completion unit 2 includes the first casing packer 4. The first casing 5 is provided on the right side of the first casing packer 4, and the first slotted screen 6 is threaded on the right side of the first casing 5, and the first slotted screen 6 constitutes the outlet Liquid screen pipe, the right side of the first slotted screen pipe 6 is threaded with the second...

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Abstract

The invention relates to a classified acid pickling acidification method of a horizontal well. The classified acid pickling acidification method of the horizontal well includes the following steps that 1, a completion pipe string comprising a drilling liner hanger and completion units is put in the well, and first casing pipe packers and second casing pipe packers on the completion units are set on the wall of the well; 2, acid pickling pipe strings are put in casing pipes, first oil pipe packers are set between a liquid inflow sieve pipe and a liquid outflow sieve pipe, and second oil pipe packers are set in the position away from the liquid inflow sieve pipe and close to the ends of oil pipes; 3, processing liquid is injected into the oil pipes, and the processing liquid enters the annulus of the wall of the well from a setting throttler and the liquid inflow sieve pipe to process the wall of the well. The completion units in the completion pipe string are matched with the acidification pipe string, segmented acid pickling acidification is achieved, the wall of the well can be specifically subjected to acid pickling acidification, the completion units and the acidification pipe string are simple in structure, spot operation is convenient, and the method is widely applied to construction of acid pickling acidification of sandstone and carbonatite oil and gas reservoir horizontal wells.

Description

technical field [0001] The invention relates to a method for graded pickling and acidification of horizontal wells. Background technique [0002] Horizontal wells are an effective means for the development of tight sandstone and carbonate reservoirs, and a reasonable well completion method is crucial to the initial high production and long-term stable production of oil and gas wells. Horizontal well completion with open hole screens has the advantages of large oil and gas seepage area and low construction cost, while the pickling and acidizing process of horizontal wells is a technology implemented to remove drilling fluid pollution in open holes and screen annulus, and the pickling and acidizing effect is The pros and cons directly affect the later stage of oil and gas production. [0003] At present, the completion acidization of screens used in horizontal wells is basically general acidization in the horizontal section. Due to the long horizontal wells, the general acidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06E21B43/22
CPCE21B37/06E21B43/16
Inventor 申贝贝徐兵威陈付虎李克智张永春李月丽王帆梁志彬薛成国李嘉瑞蒋艳芳
Owner PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO
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