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Deformable plugging and anti-sloughing agent for drilling fluid

A technology of plugging and anti-collapse, drilling fluid, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of large leakage, pressure difference sticking, leakage, etc., to achieve increased compactness, shallow damage depth, The effect of convenient material collection

Active Publication Date: 2012-09-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huge pressure difference is likely to cause downhole leakage, or due to large leakage, a thick mud cake is formed, which is prone to pressure difference sticking

Method used

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  • Deformable plugging and anti-sloughing agent for drilling fluid
  • Deformable plugging and anti-sloughing agent for drilling fluid
  • Deformable plugging and anti-sloughing agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 30 parts by weight of micron-scale non-deformable kapok staple fiber particles (purchased from Beijing Zhongke Risheng Technology Co., Ltd.), 20 parts by weight of nano-scale deformable redispersible ethylene / vinyl chloride / vinyl acetate copolymer (purchased From Tianjin Zhonghai Oil Service Chemical Co., Ltd.) and 10 weight parts of potassium humate (purchased from Beijing Zhongke Risheng Technology Co., Ltd.) mixed in a mixer for 80 minutes, and passed through a 200 mesh sieve to obtain the drilling fluid for drilling fluid of the present invention. Deformable plugging anti-collapse agent.

[0033] The core plugging flowback test was carried out on the obtained deformable plugging anti-slump agent, and the following test data as shown in Table 1 were obtained:

[0034] Table 1

[0035]

[0036] From the data in Table 1, it can be seen that the dynamic water loss rate is very low, forming an effective plug for the core. Through the flowback test, the permeability ...

Embodiment 2

[0038] 35 parts by weight of micron-scale non-deformable barite particles (purchased from Beijing Zhongke Risheng Technology Co., Ltd.), 40 parts by weight of nano-scale deformable and redispersible ethylene / vinyl chloride / vinyl laurosilicate three The meta-polymer (purchased from Tianjin Zhonghai Oil Service Chemical Co., Ltd.) and 25 parts by weight of sulfonated rubber (purchased from Beijing Zhongke Risheng Technology Co., Ltd.) were mixed in a mixer for 100 minutes, dried and ball milled through a 200-mesh sieve , to obtain the deformable plugging and anti-slump agent for drilling fluid of the present invention.

[0039] Through the core plugging flowback test, the dynamic water loss rate of the drilling fluid added with the deformable plugging anti-slump agent of the present invention and the drilling fluid added with the conventional plugging agent is tested. Depend on figure 1 It can be seen that after adding the deformable plugging and anti-slump agent of the present...

Embodiment 3

[0041] 40 parts by weight of micron-scale non-deformable cottonseed hull particles (purchased from Beijing Zhongke Risheng Technology Co., Ltd.), 30 parts by weight of nano-scale deformable and redispersible polyvinyl acetate copolymer (purchased from Tianjin COSL Chemical Co., Ltd.) and 15 parts by weight of carboxymethyl starch (purchased from Beijing Zhongke Risheng Technology Co., Ltd.) were mixed in a mixer for 120 minutes, and then passed through a 200-mesh sieve to obtain the deformable seal for drilling fluid of the present invention. Blocking anti-slump agent.

[0042]Use the permeability plugging tester (Permeability Plugging Tester, PPT) (OFI testing equipment company, the U.S.) and test the fluid loss of drilling fluid before and after adding the deformable plugging anti-slump agent of the present invention according to the steps of its product instruction manual The amount and quality of mud cake formed after drilling fluid loss.

[0043] Depend on figure 2 It ...

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Abstract

The invention relates to a deformable plugging and anti-sloughing agent for drilling fluid, and the deformable plugging and anti-sloughing agent comprises 10-90 parts by weight of non-deformable material, 20-80 parts by weight of nano-scale deformable redispersible polymer and 10-60 parts by weight of natural polymer modified material. The invention further relates to a preparation method of the deformable plugging and anti-sloughing agent for the drilling fluid. The preparation method comprises the following steps: mixing all the components according to the corresponding mixture ratio, mixing by virtue of a mixing and stirring machine for 80-120 minutes and screening by virtue of a 100-300 mesh screen, thus obtaining the deformable plugging and anti-sloughing agent.

Description

technical field [0001] The invention relates to an additive for drilling fluid, in particular to a deformable plugging and anti-collapse agent for drilling fluid. Background technique [0002] During oil and gas field development, drilling fluid is used during drilling operations. The function of the drilling fluid is to cool and clean the drill bit, carry the cuttings into the annulus, and separate them. Keep the borehole wall of the open hole stable and reduce friction. At the same time, the drilling fluid is also designed to form a thin but tough mudcake that plugs pores, microfractures and other permeable formations. Drilling fluids are also used to collect and interpret formation information through cuttings, core and wireline logging. [0003] Drilling fluids are typically classified by matrix. In water-based drilling fluids, solid particles are suspended in water or brine. [0004] When drilling in shale, the prominent problem encountered in drilling fluid is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/56
Inventor 王健胡进军夏小春孙强冀腾段连超项涛
Owner CHINA NAT OFFSHORE OIL CORP
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