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Modified nano-drilling fluid treating agent for restraining mud shale expansion

A kind of drilling fluid treatment agent and nano technology, applied in drilling composition, chemical instruments and methods, etc., to achieve the effect of reducing fluid loss, good toughness and good quality

Inactive Publication Date: 2010-09-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In complex formations, extreme environments and ultra-deep well drilling, nanomaterials should make the working fluid meet extreme conditions such as high temperature, high salt, etc., to obtain multi-functionality and adaptability. This method to inhibit shale expansion is rarely reported

Method used

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  • Modified nano-drilling fluid treating agent for restraining mud shale expansion

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example 1

[0008] Example 1: Modified nano-drilling fluid treatment agent for inhibiting shale expansion and preparation method thereof

[0009] (1) Experimental formula and conditions:

[0010] The modified nano-drilling fluid treatment agent for inhibiting shale expansion is composed of nano-SiO 2 , acrylamide, silane coupling agent KH-550, ammonium persulfate, toluene, and distilled water. The quality of each raw material is in grams and some properties are: nano-SiO 2 5-10g, density 2.33, specific surface area 150m 2 / g, particle size 20-40nm (powder particle size less than 100nm belongs to nanoparticles); acrylamide 8g, molecular weight 71.08; silane coupling agent KH-5500.8g; ammonium persulfate initiator 0.2g; toluene 300g; distilled water 500g ; Nitrogen atmosphere for 30 minutes, the pH value was adjusted to 8-8.5, and the temperature of the water bath was controlled at 15-20°C.

[0011] (2) Preparation method of modified nano treatment agent for inhibiting shale expansion: ...

example 2

[0013] Example 2: Prevention of shale expansion test

[0014] Configure KCl-PAM drilling fluid, and use a high-temperature and high-pressure shale dilatometer to evaluate the inhibition of the drilling fluid system to shale. Weigh 10g of rock cuttings powder, maintain a pressure of 4MPa on a tablet machine for 5min to obtain a sample tablet, then soak it with the prepared 350mL solution, and measure the linear expansion height during the soaking process on a shale dilatometer. Calculate the linear expansion rate with the expansion rate calculation formula (1-1), and the experimental results are shown in Table 1-1.

[0015] VH=Rt / H×100% (1-1)

[0016] Rt-the linear expansion at time t, mm; H-the original height of the core, mm.

[0017] Table 1-1 Results of rolling dispersion of shale in different media

[0018]

[0019] Note: 1-KCl-PAM drilling fluid; 2-acrylamide graft polymerization modified nano-SiO 2 - KCl-PAM drilling fluid;

[0020] It can be seen from Table 1-1 ...

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Abstract

The invention relates to a modified nano-drilling fluid treating agent for restraining mud shale expansion in petroleum and natural gas drilling. The treating agent can form a dense mud cake at the mouth of an underground porous channel so as to effectively protect a well wall. The technical scheme is that: the treating agent comprises the following raw materials by gram: 5 to 10 g of nano-SiO2, 8 g of acrylamide, 0.8 g of silane coupling agent KH-550, 0.2 g of ammonium persulfate, 300 g of toluene and 500 g of distilled water, wherein nano-SiO2 has the density of 2.33, the specific surface area of 150m<2> / g and the particle size of 20 to 40 nm; and the acrylamide has the molecular weight of 71.08. The silane coupling agent is grafted on the nano-SiO2 by using the silane coupling agent and the acrylamide is grafted and polymerized to form long-chain grafted nano-SiO2 which is called as modified nano-SiO2; and nano-SiO2 particles are uniformly and stably dispersed in the drilling fluid to form the modified nano-drilling fluid. The treating agent has the advantages of higher mud cake quality, thinner mud cake, good toughness, capability of remarkably reducing filtration loss and remarkable mud shale expansion preventing effect, and is used as the treating agent in the field of drilling.

Description

Technical field: [0001] The invention relates to a modified nano-drilling fluid treatment agent for inhibiting mud shale expansion in the field of oil and natural gas drilling. Background technique: [0002] In the process of oil and gas drilling, mud shale is often drilled, and mud shale is easy to hydrate and expand. Water-based drilling fluid will increase the degree of hydration expansion of mud shale, while other types of drilling fluids such as oil-based drilling fluid, Most polymer drilling fluids can prevent the hydration expansion of mud shale. At present, water-based drilling fluids are used to prevent shale expansion mainly by adding formate, using positive gel, etc., which are all achieved by neutralizing the negative charges on the surface of shale with the positive charges in the drilling fluid. Once these drilling fluids are required to have a good suppression effect, the cost will inevitably increase. Oilfields hope to find a shale swelling suppression treat...

Claims

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Application Information

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IPC IPC(8): C09K8/03
Inventor 陈玉祥王霞杜旭东刘道杰赵竹轩杨志刚
Owner SOUTHWEST PETROLEUM UNIV
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