An environmental responsive cementing filter cake removal fluid

A technology of environmental response and scavenging liquid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to perform, scavenger decomposition failure, filter cake removal efficiency decline, etc., to speed up the reaction speed and scavenging time Short, conducive to the effect of the effect

Active Publication Date: 2022-05-24
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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  • An environmental responsive cementing filter cake removal fluid
  • An environmental responsive cementing filter cake removal fluid
  • An environmental responsive cementing filter cake removal fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0043] Using NaOH to adjust the pH of water to 8, 10 parts by weight of environmental responsive scavenger A, 1 part by weight of environmental responsive scavenger B, 0.5 part by weight of nonylphenol polyoxyethylene ether (as a surfactant), 0.2 part by weight of 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 a...

Embodiment 2

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

[0056] Using NaOH to adjust the pH of water to 9, 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 a surfactant), 0.5 part by weight of Fatty alcohol polyoxyethylene ether (as surfactant), 0.5 parts by weight of sodium dodecylbenzene sulfonate (as surfactant), 1.0 part by weight of carboxymethyl cellulose (as suspending agent), 0.7 parts by weight of AMPS and Copolymer of DAAM (diacetone acrylamide) and AM (as a suspending agent), 2 parts by weight of a mixture of attapulgite and nano-silica (as a stabilizer, the weight ratio of attapulgite to n...

Embodiment 3

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

[0069] Using NaOH to adjust the pH of water to 9, 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 a surfactant), 1.5 parts by weight of Sodium dodecylbenzenesulfonate (as a surfactant), 1.5 parts by weight of hydroxyethyl cellulose (as a suspending agent), 1 part by weight of AMPS, AM, MA copolymer (as a suspending agent), 3 parts by weight of concave and convex The mixture of palygorskite and nano-silica (as a stabilizer, the weight ratio of attapulgite and nano-silica is 70:30) was added into 100 parts by weight of water with a prepared pH of ...

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Abstract

The invention discloses an environment-responsive cementing filter cake removal liquid, which comprises the following components in parts by weight: 5-20 parts of environment-responsive scavenger A, 0.2-5 parts of environment-responsive scavenger B. 0.5-3 parts of surfactant 1. 0.3-2.5 parts of suspending agent, 0.5-3 parts of stabilizer and 100 parts of water with a pH of 8-10. The scavenger component of the present invention can only start to react under certain temperature and pH conditions downhole, and through the synergistic activation of the environment-responsive scavenger B-formation heat on the environmental-responsive scavenger A, the decomposition of the polymer treatment agent is improved Efficiency and speed, to achieve rapid decomposition in a short period of time, the solid phase particles are easy to be removed after the filter cake is destroyed, and avoid the early decomposition of the scavenger caused by liquid preparation, transportation and other links, and adapt to the characteristics and requirements of cementing operations.

Description

technical field [0001] The invention relates to a cementing filter cake removal liquid, in particular to an environment-responsive cementing filter cake removal liquid. Background technique [0002] During drilling, the drilling fluid is filtrated under the action of the pressure difference, and the polymer treatment agent and solid phase 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 loose structure and a large amount of polymers. The poor formation and working conditions lead to the deterioration of the drilling fluid performance during the drilling process, and the virtual thick layer of the filter cake formed is thick. - Weak layers at the stratigraphic interface. It is easy to cause formation fluid to channel between layers or to the wellhead, which seriously affects the production life and benefits of o...

Claims

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Application Information

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Patent Type & Authority Patents(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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