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Environmental response type well cementation filter cake removing liquid

An environmental response and scavenging liquid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of filter cake removal efficiency decline, inability to play, and scavenger decomposition failure, etc., to achieve the effect and speed up The effect of short reaction speed and clearing time

Active Publication Date: 2021-06-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the early preparation, transportation and pumping process, the scavenger components in the flushing liquid will react immediately after contacting each other, resulting in premature decomposition and failure of the scavenger. effect

Method used

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  • Environmental response type well cementation filter cake removing liquid
  • Environmental response type well cementation filter cake removing liquid
  • Environmental response type well cementation filter cake removing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] An environment-responsive cementing filter cake removal fluid, the cementing filter cake removal fluid comprises: an environmental-responsive scavenger A, an environmental-responsive scavenger B, a surfactant, a suspending agent, a stabilizer and water, and its preparation method details as follows:

[0043] Adopt NaOH to adjust the pH of water to 8, with 10 parts by weight of environment-responsive scavenger A, 1 part by weight of environment-responsive scavenger B, 0.5 parts by weight of nonylphenol polyoxyethylene ether (as surfactant), 0.2 parts by weight Octylphenol polyoxyethylene ether, 0.05 parts by weight of lauryl alcohol polyoxyethylene ether (as surfactant), 1.2 parts by weight of xanthan gum (as suspending agent), 0.5 parts by weight of AMPS (2-acrylamide-2-methyl propanesulfonic acid) and AM (acrylamide) and MA (maleic anhydride) copolymer (as suspending agent), 2.5 parts by weight of attapulgite and nano silica mixture (as stabilizer, attapulgite and nano...

Embodiment 2

[0055] An environment-responsive cementing filter cake removal fluid, the cementing filter cake removal fluid comprises: an environmental-responsive scavenger A, an environmental-responsive scavenger B, a surfactant, a suspending agent, a stabilizer and water, and its preparation method details as follows:

[0056] Adopt NaOH to adjust the pH of water to 9, with 15 parts by weight of environment-responsive scavenger A, 2.5 parts by weight of environment-responsive scavenger B, 1 part by weight of octylphenol polyoxyethylene ether (as surfactant), 0.5 parts by weight Fatty alcohol polyoxyethylene ether (as surfactant), 0.5 parts by weight of sodium dodecylbenzene sulfonate (as surfactant), 1.0 parts by weight of carboxymethyl cellulose (as suspending agent), 0.7 parts by weight of AMPS and DAAM (diacetone acrylamide) and AM copolymer (as suspending agent), 2 parts by weight of attapulgite and nano-silica mixture (as a stabilizer, the weight ratio of attapulgite and nano-silica ...

Embodiment 3

[0068] An environment-responsive cementing filter cake removal fluid, the cementing filter cake removal fluid comprises: an environmental-responsive scavenger A, an environmental-responsive scavenger B, a surfactant, a suspending agent, a stabilizer and water, and its preparation method details as follows:

[0069] Adopt NaOH to adjust the pH of water to 9, with 10 parts by weight of environment-responsive scavenger A, 2 parts by weight of environment-responsive scavenger B, 2 parts by weight of nonylphenol polyoxyethylene ether (as surfactant), 1.5 parts by weight Sodium dodecylbenzenesulfonate (as surfactant), 1.5 parts by weight of hydroxyethyl cellulose (as suspending agent), 1 part by weight of AMPS and AM, the copolymer of MA (as suspending agent), 3 parts by weight of concavo-convex A mixture of palygorskite and nano-silica (as a stabilizer, the weight ratio of attapulgite to nano-silica is 70:30) is added to 100 parts by weight of prepared water with a pH of 9, and sti...

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Abstract

The invention discloses an environmental response type well cementation filter cake removing liquid which comprises the following components in parts by weight: 5-20 parts of an environmental response type scavenger A, 0.2-5 parts of an environmental response type scavenger B, 0.5-3 parts of a surfactant I, 0.3-2.5 parts of a suspending agent, 0.5-3 parts of a stabilizer and 100 parts of water with the pH value of 8-10. Components of the scavengers can start to react under the conditions of certain underground temperature and pH, through the synergistic activation effect of the environment response type scavenger B-formation heat on the environment response type scavenger A, the decomposition efficiency and rate of a polymer treating agent are improved, rapid decomposition within a short time is achieved, solid-phase particles are easy to remove after a filter cake is damaged, and in addition, advanced decomposition of the scavengers in the links of liquid preparation, transportation and the like is avoided, and the characteristics and requirements of well cementation operation are met.

Description

technical field [0001] The invention relates to a cementing filter cake removal fluid, in particular to an environment responsive cementing filter cake removal fluid. Background technique [0002] When drilling, the drilling fluid is filtered out under the action of differential pressure, and the polymer treatment agent and solid particles (bentonite, weighting agent, etc.) accumulate on the well wall to form a filter cake. The filter cake can be roughly divided into a compacted layer with a dense structure and a virtual thick layer with a looser structure and a large amount of polymer. The poor formation and working conditions lead to the deterioration of the performance of the drilling fluid during the drilling process, and the formed filter cake has a large thickness. It is not solidified, highly adhesive and difficult to remove, making it a cement sheath after cementing - Weak layers at stratigraphic boundaries. It is easy to cause formation fluid to channel between la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C08G73/06C08F220/54C08F220/06C08F220/58C08F112/08C08F222/38
CPCC09K8/52C08G73/0611C08F220/54C08F220/06C08F112/08C08F220/58C08F222/385
Inventor 黄盛杨涪杰李早元刘健孙劲飞苏东华冯波
Owner SOUTHWEST PETROLEUM UNIV
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