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Waterproof locking agent used for drilling fluid

A technology of waterproof locking agent and drilling fluid, which can be used in drilling compositions, chemical instruments and methods, etc., and can solve the problem of high cost

Active Publication Date: 2015-02-11
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method is more expensive

Method used

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  • Waterproof locking agent used for drilling fluid
  • Waterproof locking agent used for drilling fluid
  • Waterproof locking agent used for drilling fluid

Examples

Experimental program
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Effect test

Embodiment Construction

[0019] The waterproof locking agent for drilling fluid of the present invention is prepared by adding 40% of white oil, 1% of n-amyl alcohol and 2% of sodium lauryl sulfate into fresh water, and stirring evenly.

[0020] Drilling Fluid Formula:

[0021] 4% sodium soil + 0.1% NaOH + 0.3% KPAM + 0.4% LV-CMC + 1% NH 4 PAN

[0022] Instruments used for routine performance evaluation of drilling fluids:

[0023] ZNN-P6 six-speed rotary viscometer and ZNS-6 medium pressure filter loss tester.

[0024] General performance of drilling fluid

[0025]

[0026] The instrument used in the permeability recovery experiment and the flowback unplugging experiment is the JHMD-II high temperature and high pressure core dynamic damage evaluation system. The operating procedures of the system are as follows:

[0027] 1. Determination of original permeability

[0028] 1. Tighten the right plunger, check whether the vertical valve on the right plunger is open (open when testing permeability...

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Abstract

The invention relates to a waterproof locking agent used for a drilling fluid, and relates to the waterproof locking agent capable of reducing liquid phase trap damage during drilling operation enforcing on a low permeability oil gas layer, The waterproof locking agent comprises: at least a surfactant capable of reducing interface tension; at least a cosurfactant capable of reducing interface tension and performing solubilization; at least one of plant oil or mineral oil; and the balance of water. According to the invention, the waterproof locking agent used in the drilling fluid for low permeability reservoir exploitation can change the tension of rock interface, reduce the oil gas flow resistance and thereby reduce the liquid phase trap damage during drilling operation enforcing on the low permeability oil gas layer, thereby the purposes of protecting reservoir and enhancing the yield can be reached.

Description

technical field [0001] The invention relates to a treatment agent for oil and gas field exploration and development, in particular to a waterproof locking agent for reducing liquid phase trap damage during drilling operations in low-permeability oil and gas layers. Background technique [0002] As soon as the reservoir is opened during drilling, a series of construction working fluids will contact the reservoir. If the external water-phase fluid invades the water-wetted reservoir pores, it will form a water-phase blockage in the pores around the well wall, and its water- There is a capillary pressure on the gas bending interface. This additional capillary pressure must be overcome in order for oil and gas to flow to the wellbore. If the energy of the reservoir is not enough to overcome this additional pressure, the water blockage cannot be completely driven away, which will eventually affect the recovery of the reservoir. This kind of damage is called water lock damage. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
Inventor 张敬辉李公让武学芹何平李海滨王莉萍李斌郑成胜
Owner CHINA PETROCHEMICAL CORP