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Staged fracturing and production increasing revamping method for well cementation and completion shaft of three and a half inches of sidetrack horizontal well

A technology of sidetracking horizontal wells and staged fracturing, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc. It can solve problems such as high risk of pipe sticking, uncontrollable fractures, and high safety risks. To achieve the effects of ensuring oil recovery operations, ensuring safe construction, and improving utilization

Inactive Publication Date: 2020-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing problems of high pipe sticking risk, high safety risk and uncontrollable fractures, the present invention provides a method for staged fracturing stimulation of a sidetracked horizontal well with a 3-inch semi-solid completion wellbore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In order to solve the existing problems of high pipe sticking risk, high safety risk, and uncontrollable fractures, the present invention provides a method for staged fracturing stimulation of a sidetracked horizontal well with a 3-inch semi-solid completion wellbore. This method realizes the precise initiation and effective extension of each fracture, improves the utilization rate of the horizontal section, and achieves the purpose of controlling water and increasing oil production.

[0031] A method for staged fracturing stimulation of a sidetracked horizontal well with a 3-inch half-solid completion wellbore, the specific steps of which are as follows:

[0032] S1, perform perforation, acid treatment and temporary plugging and fracturing in the first section;

[0033] S2, running the bridge plug to seal the first perforation section;

[0034] S3, performing perforation, acid treatment and temporary plugging and fracturing in the second section;

[0035] S4, washing...

Embodiment 2

[0042] Based on Example 1, in this example, preferably, in the step S1, the perforation is carried out through oil pipe transmission, the phase of the perforating gun is 90°, the diameter of the perforating gun is 54 mm or 60 mm, and the hole density is 16 Holes / m, the perforation section is 1-2 meters long.

[0043] Preferably, in the step S1, the acid treatment step is: sequentially inject acid liquid and barite plugging solution with a weight ratio of 1:1 from the fracturing string to clean the perforated blast hole and close the The mud polluted zone in the well zone is used for plugging removal. The amount of acid liquid is injected into 3-5m³ per meter according to the thickness of the oil layer, and the displacement is 0.2-0.5m 3 / min, shut down the well for at least 45 minutes after acid treatment.

[0044] Preferably, the acid solution includes earth acid and cellulose plugging remover in a weight ratio of 10:1; the concentration of the barite plugging remover soluti...

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Abstract

The invention provides a staged fracturing and production increasing revamping method for a well cementation and completion shaft of three and a half inches of a sidetrack horizontal well. The methodcomprises the specific steps that S1, perforation, acid treatment and in-seam temporary plugging fracturing are carried out on a first section; S2, a bridge plug is tripped in to pack a perforated section of the first section; S3, perforation, acid treatment and in-seam temporary plugging fracturing are carried out on a second section; S4, a sand washing tubular column is tripped in to wash the well; S5, a fishing tool is tripped in to fish the bridge plug; S6, the steps S3-S5 are repeated to complete fracturing construction of all the sections; and S7, a production tubular column is tripped in to be put into production. According to the method, multi-section fracturing revamping can be achieved in the well cementation and completion shaft of three and a half inches of the sidetrack horizontal well under the condition of an oil field injection-production pattern, precise crack initiation and effective extending of each seam are achieved, the use rate of an oil layer section is increased, and the aim of increasing the production is achieved.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a method for staged fracturing stimulation of a sidetracked horizontal well with a 3-inch semi-solid completion wellbore. Background technique [0002] Low-permeability sandstone reservoirs were initially developed with the main development method of "water injection + fracturing". Due to the influence of reservoir heterogeneity and micro-fracture development, the water flooding situation was complicated, resulting in premature water breakthrough of main direction oil wells and loss of productivity Seriously, the remaining oil cannot be fully exploited. Sidetracked horizontal wells can effectively increase the controlled reserves of a single well. Compared with sidetracked directional wells, they have the advantages of larger contact area with oil layers, larger stimulated volume, and higher single well production. [0003] The above-mentioned sidetracking horizontal we...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/13E21B37/06E21B43/14E21B21/00E21B31/00C09K8/52
CPCC09K8/52E21B21/00E21B31/00E21B37/06E21B43/14E21B43/261
Inventor 苏良银刘汉斌卜向前齐银常笃汪澜董奇
Owner PETROCHINA CO LTD
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