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Drilling circulating fluid conversion preflush and preparation method thereof

A technology of circulating fluid and pre-fluid, applied in chemical instruments and methods, drilling composition, etc., can solve the problems affecting the advantages of gas drilling, reaming, sidetracking, etc., so as to shorten complex processing time and save drilling costs. , The effect of stable product performance

Active Publication Date: 2011-01-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the actual situation of gas drilling in the past, more than 80% of the wells have complicated situations after the gas drilling is completed and the drilling fluid is injected. , and the sidetracking is caused by the difficulty of handling the stuck pipe, which seriously affects the advantages of gas drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, the composition of the drilling circulating fluid conversion prefluid in parts by mass: 50 to 100 parts of organic ester A, 5 to 20 parts of plasticizer B, 50 to 140 parts oil C, 0.1 to 1 part of emulsifier D, 2 to 10 parts of blocking agent E; wherein, organic ester A is phthalates or polyol benzoate, plasticizer B is One of polyethylene or polyvinyl chloride resin, oil C is mineral oil or vegetable oil, emulsifier D is OP-10, OP-30, Tween-80, SP-80, oleic acid, P-30, P- One or more of 20; plugging agent E is one of asphalt or modified asphalt products.

Embodiment 2

[0016] Embodiment 2, the difference with embodiment 1 is: the mineral oil of embodiment 2 is a kind of in white oil, diesel oil, aviation kerosene.

Embodiment 3

[0017] Embodiment 3 differs from Embodiment 1 in that the vegetable oil in Embodiment 3 is one of the modified vegetable oil products of cottonseed oil and other vegetable oils.

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PUM

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Abstract

The invention discloses drilling circulating fluid conversion preflush and a preparation method thereof. The drilling circulating fluid conversion preflush consists of an organic ester, a plasticizer, oil, an emulsifier and a plugging agent, wherein the organic ester is phthalate esters or polyol benzoates; the plasticizer is one of polyethylene or vinyl chloride resin; the oil is mineral oil or vegetable oil; the emulsifier is one or more of OP-10, OP-30, tween-80, SP-80, oleic acid, P-30 and P-20; and the plugging agent is one of asphalt or modified asphalt products. The drilling circulating fluid conversion preflush has the advantages of: nontoxic or harmless production process, wider appropriate temperature range (-30 to 200 DEG C) than the appropriate temperature range (-5 to 160 DEGC) of conventional oil-in-water circulating fluid conversion preflush, stable product performance, good effect on keeping borehole wall stability, and capacity of shortening over 2 / 3 of complex processing time after conversing a drilling circulating fluid, improves drilling prescription, and saves drilling cost.

Description

[0001] technical field [0002] The invention relates to the technical field of a prefluid for oil and gas drilling and a preparation method thereof, and relates to a drilling circulating fluid conversion prefluid and a preparation method thereof. Background technique [0003] Gas drilling is mainly a special drilling method that uses gas-based fluid and gas-type fluid as the circulating medium. In the process of gas drilling, there are often many factors that are unfavorable to gas drilling due to unpredictable geological reasons, engineering technical requirements and other reasons that cannot continue to use gas-based fluids for drilling. It is necessary to convert from gas drilling to conventional drilling. Gas-based fluid (pure gas) is converted into aerated, foam and other gas-based fluids or water-based drilling fluids, or directly converted from gas-based fluids to various water-based drilling fluid systems to meet the engineering requirements of gas drilling to conv...

Claims

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Application Information

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IPC IPC(8): C09K8/502
Inventor 宋朝晖乔东宇李晓军黄治中郑义平伊明杨刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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