A water plugging method for horizontal wells with screen tubes

A technology for horizontal wells and screens, which is used in earth-moving drilling, wellbore/well components, sealing/packing, etc. It can solve the problem of no effective mechanical segmentation method, difficult to judge the water-producing well section, and difficult to plug water with water blocking agents. and other problems, to achieve the effect of improving crude oil fluidity, improving production effect and high plugging rate

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to restore the normal production capacity and prolong the service life of such horizontal wells, the simplest, most economical and most effective way is to implement water blocking and channel sealing operations, but the current water blocking process is inefficient mainly because: It is difficult to judge the section, the screen pipe is completed, there is an external connection, and there is no effective mechanical segmentation method; the horizontal section is long, and it is difficult for general water blocking agents to block water in a targeted manner; after the original water outlet channel is blocked, the water cone flows around Causes short effective period of water blocking

Method used

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  • A water plugging method for horizontal wells with screen tubes
  • A water plugging method for horizontal wells with screen tubes
  • A water plugging method for horizontal wells with screen tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] In this example, the performance of the powder temporary plugging agent is evaluated, and artificial cores are used to conduct water phase and oil phase plugging rate experiments on the powder temporary plugging agent.

[0111]The powder temporary plugging agent of different concentrations (the powder temporary plugging agent with different percentages in the mixed solution of the powder temporary plugging agent and the water-based plugging agent, the powder temporary plugging agent adopted is 3:1 by mass ratio: 1 resin granules, bamboo charcoal granules and copal granules are mixed, and the particle size is 1mm. The raw materials of the water-based plugging agent used are polyacrylamide 2.0%, sodium humate 4.0%, hexamethylenetetramine 0.15%, 1.0% sodium phenate, 0.25% glacial acetic acid, 0.1% cyclohexyl hexaphosphate, and the rest of the water. The degree of hydrolysis of polyacrylamide is 20%, and the molecular weight is 20 million.) Mix with artificial quartz sand, p...

Embodiment 2

[0119] In this example, the performance of the water-based plugging agent is evaluated, and the fluidity of the water-based plugging agent with different concentrations at different times is tested. The results are shown in Table 2.

[0120] experiment procedure:

[0121] Prepare 4 groups of water-based plugging bases with different concentrations, and test their viscosity at 60°C for different time periods, and the unit is mPa·s.

[0122] Formula 1: polyacrylamide (1.0%), sodium humate (3.0%), hexamethylenetetramine (0.5%), sodium phenate (0.5%), glacial acetic acid (0.05%), cyclohexanehexa Phosphate (0.05%), balance water. The degree of hydrolysis of polyacrylamide is 20%, and the molecular weight is 20 million.

[0123] Formula 2: polyacrylamide (1.5%), sodium humate (3.5%), hexamethylenetetramine (1.0%), sodium phenate (0.8%), glacial acetic acid (0.2%), hexacyclohexyl Phosphate (0.1%), balance water. The degree of hydrolysis of polyacrylamide is 20%, and the molecula...

Embodiment 3

[0130] This example provides a performance evaluation test for the composite temperature-resistant plugging agent.

[0131] experiment procedure:

[0132] Prepare two sets of formulations of the lowest / highest concentration composite temperature-resistant plugging agent, observe the curing time of the two sets of formulations, and test the compressive strength after curing;

[0133] Put two sets of composite temperature-resistant plugging agents into a muffle furnace at 350°C for 30 days, take them out to observe their shape, and test their compressive strength. The results are shown in Table 3.

[0134] Formula 1: 8% calcium sulfate dihydrate, 4% hydrous silicic acid powder, 4% sodium bentonite, 0.5% mannitol, 0.5% low molecular weight polyacrylamide, 0.05% m-phenylenediamine, 0.05% sodium hydroxide, and The amount is water, the degree of hydrolysis of low molecular weight polyacrylamide is 15%, and the molecular weight is 2.5 million.

[0135] Formula 2: calcium sulfate d...

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Abstract

The invention provides a water plugging method for a sieve tube horizontal well. The water plugging method includes the following steps that nitrogen is injected into the horizontal well to form a first segment plug; temporary plugging agent powder and water-base plugging adjusting agent powder are injected to form a second segment plug; nitrogen is injected to form a third segment plug; a water-base plugging adjusting agent is injected to form a fourth segment plug; a composite temperature-resistant plugging agent is injected to form a fifth segment plug; a polyacrylamide solution is replacedto form a sixth segment plug; waiting on cement setting is performed, steam of 3,500-35,000 mm<3> is injected, and well is shut in for 24 h; liquefied carbon dioxide is injected to form a seventh segment plug, so that water plugging is completed for the sieve tube horizontal well. The water plugging method for the sieve tube horizontal well is an efficient water plugging method, and water plugging can be realized for a deep part and a well nearby area of the horizontal well.

Description

technical field [0001] The invention relates to a water shutoff method, in particular to a water shutoff method for a screen tube horizontal well, and belongs to the technical field of oil reservoir exploitation. Background technique [0002] The production rate of horizontal well is high, and its income is far greater than the cost of drilling and completion, and it has more advantages than vertical well in the production of heavy oil and thick oil layers. However, after long-term mining and frequent implementation of production stimulation measures such as fracturing, steam injection, acidification, etc., as well as structural reasons, horizontal wells are more prone to steam channeling and water channeling during the mining process. Excessive water production affects production capacity. After a water breakthrough occurs in a horizontal well, oil production is drastically reduced, water treatment costs increase, and without proper remedial measures, premature shutdown is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 王尧李瑞王斯雯刘江玲马昌明王浩彭宝亮刘如杰刘强陈小凯管紫君李俊萍郝英敏郑猛李腾
Owner PETROCHINA CO LTD
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