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Method for improving foam well drilling efficiency by foam pre-evolution liquid device

A technology of foam and dry foam, which is applied in drilling compositions, chemical instruments and methods, and earthwork drilling and production, can solve the problems of inability to carry water, low foam dryness, and formation of liquid accumulation, and avoid drilling Accidents, increase foam dryness, and facilitate refitting effects

Inactive Publication Date: 2008-07-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the foam entrains a large amount of free water during high-speed generation and flow, the dryness of the foam is low, and it is easy to form fluid accumulation at the bottom of the well. Cuttings adhere to the well wall in the downhole, which can easily cause drilling accidents such as drill sticking

Method used

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  • Method for improving foam well drilling efficiency by foam pre-evolution liquid device
  • Method for improving foam well drilling efficiency by foam pre-evolution liquid device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of foam pre-analysis device, structure as shown in Figure 2, pre-analysis device 2 is a spherical container 9, is provided with semicircular dividing plate 14 and liquid level sensor 13 in the spherical container 9, is provided with on the spherical container 9 Foam inlet 10, dry foam outlet 11 and automatic control drain 12; the axis of foam inlet 10 and the axis of dry foam outlet 11 are perpendicular to each other, and dry foam outlet 11 and automatic control drain 12 are on the same axis; semicircle A shaped partition 14 is arranged on the inner wall of the spherical container 9 and is located between the foam inlet 10 and the outlet 11 ; the liquid level sensor 13 is arranged below the middle of the spherical container 9 .

[0030] The included angle between the semicircular partition 14 and the axis of the dry foam outlet 11 is 0°-90°.

[0031] The dry foam outlet 11 is located directly above the spherical container 9 .

[0032] The automatic control drain...

Embodiment 2

[0040] The foam pre-analysis device and the method of utilizing the foam pre-analysis device to improve the foam drilling efficiency are the same as in Example 1. The difference is that when betaine is used as a foam agent, the dryness of the betaine foam is 52% when the betaine foam is generated. The dryness of the pre-analysed liquid foam obtained by the device is 89%. Using this foam to simulate drilling, the non-separated foam will precipitate 50ml of liquid in the wellbore within 220s; the pre-separated foam will have no liquid precipitated in the wellbore, and can carry 50ml of pre-added water from the wellbore within 190s.

Embodiment 3

[0042] The foam pre-analysis device and the method of utilizing the foam pre-analysis device to improve the foam drilling efficiency are the same as in Example 1, and the difference is that when the alkyl ethoxy sodium sulfate is used as a foam agent, when the alkyl ethoxy sodium sulfate foam generates The dryness is 49%, and the dryness of the pre-analysis foam obtained by the pre-analysis device is 78%. Using this foam to simulate drilling, the unanalysed foam 14Os precipitates 50ml of liquid in the wellbore; the pre-dialysis foam has no liquid in the wellbore Precipitate, and can carry out from the wellbore within 510s all the pre-added 50ml turbid liquid containing 1.0% solid particles.

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Abstract

The invention provides a method which utilizes a foam pre-dialyzing liquid device to improve the efficiency of foam drilling and belongs to the technical field of petroleum drilling. The concrete method is as follows: 1) nitrogen or air flow passes a porous medium sand core to mix with a foam base solution containing the active ingredient of interfacial active agent to produce continuous foam and get the fresh foam with the dryness of 45-60%; 2) the fresh foam with the dryness of 45-60% is sent into the pre-dialyzing liquid device, and the pre-dialyzing liquid device reduces the motion speed of the foam, and a large amount of mobile water carried in the foam is separated out by the gravity action and the pre-dialyzing liquid dry foam with the dryness of 75-95% is acquired; 3) the dry foam of the pre-dialyzing liquid is sent into a well bore to take out the water and the solid matters such as drill chips in the well bore. The invention can rapidly take out the strata water in the well, and the bottom of the well has no residual liquid, which can avoid the occurrence of drilling accidents.

Description

technical field [0001] The invention relates to a method for improving foam drilling efficiency by utilizing a foam pre-analysis device, and belongs to the technical field of petroleum drilling. Background of the invention [0002] During the drilling process, it is often encountered that the formation pressure is too low and the downhole pressure is unbalanced. At this time, the traditional mud drilling will cause serious problems. When mud drilling fluid is used in underbalanced drilling, the drilling fluid will penetrate into the production layer and damage the oil and gas layers; under the condition of well-developed formation fractures, the drilling fluid will also leak a lot, so it is necessary to use low-density drilling fluid to avoid damage to oil and gas layers and Prevent ground leakage. Generally, the following low-density drilling fluids are mainly used in underbalanced drilling: 1. Conventional drilling fluid; 2. Gas fluid; 3. Mist fluid; 4. Aerated water-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/14C09K8/38
Inventor 李英张辉薛玉志
Owner SHANDONG UNIV
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