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Method for increasing formation bearing pressure during drilling plugging

A technology of pressure bearing capacity and formation, applied in the field of leakage plugging materials, can solve the problems of difficulty in bridging, easy to crush and deform, and difficult to form, and achieve the effect of easy bridging and improvement of pressure bearing capacity.

Inactive Publication Date: 2015-09-09
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for improving the pressure bearing capacity of formations during drilling and plugging, aiming at solving the difficulties in the process of drilling fracture plugging due to the low strength, easy hydration, easy crushing and deformation of the existing plugging materials. Problems with bridging, difficulty in forming a packing layer, and inability to withstand higher temperatures

Method used

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  • Method for increasing formation bearing pressure during drilling plugging
  • Method for increasing formation bearing pressure during drilling plugging
  • Method for increasing formation bearing pressure during drilling plugging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 The preparation of hard type plugging material

[0041] (1) Mix 70-80 parts of calcite, 0-10 parts of marble, 0-10 parts of quartz and 0-10 parts of granite to obtain rigid plugging agent GFD;

[0042] (2) Grind the rigid plugging agent GFD into 0, A-G8 particle size grades, as shown in Table 2 below:

[0043] Table 2 Level Classification

[0044]

Embodiment 2

[0045] The preparation of embodiment 2 auxiliary materials

[0046] Walnut shells, ultra-fine calcium carbonate and mica were respectively ground into various particle size grades as shown in Table 2 in Example 1 above.

Embodiment 3

[0047] The establishment of embodiment 3 optimal ratio relation table

[0048] 1. Experimental instruments: improved DL plugging tester, HTHP water loss tester, etc.

[0049] Use the DL-type plugging instrument to modify, remove the lower marble, and add a stainless steel crack mold, where the crack on the mold is wedge-shaped to simulate the crack. According to the stratum data statistics, the fracture opening in the stratum is selected as 0.5, 1, 1.5, 2, 3mm. If the fracture opening is greater than 3 mm, the leakage rate is too high, and the wellhead is generally lost. For cracks smaller than 0.5mm, the phenomenon is not obvious in indoor experiments.

[0050] 2. Test drugs:

[0051] For base slurry with 4% bentonite content, add 0.1% NaOH, 0.05% KPAM, 4% SMC, 4% SMP-1, 0.5% LS-2, 4% FRH, 2% Fk-10, 0.3% SP-80, The density is 1.60g / cm 3 .

[0052] 3. Subjects

[0053]The experiment of improving the pressure bearing capacity of the formation with pressure plugging in We...

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Abstract

The invention provides a method for increasing formation bearing pressure during drilling plugging. The method comprises the following steps: by mixing calcite, marble, quartz and granite, a rigid plugging agent GFD is obtained, the rigid plugging agent GFD is ground into four particle size grades, and all grades of the rigid plugging agent GFD are mixed in proportion, so as to obtain a rigid plugging material; an optimal mixing relation table of different opening degrees of cracks, different particle size grades of the rigid plugging agent GFD and the concentration of the plugging material is built through an experimental method; through the optimal mixing relation table, auxiliary materials are matched for plugging operations on cracks with different degrees. The method for plugging, provided by the invention, can effectively improve the formation bearing pressure, and has the characteristics of high intensity, no hydration, zero deformation and the like, bridging during a drilling crack plugging process is easy, a stamping layer is formed through filling, and relatively high temperature can be borne.

Description

technical field [0001] The invention belongs to the field of plugging materials, and in particular relates to a method for improving the pressure-bearing capacity of formations during plugging in well drilling. Background technique [0002] At present, the commonly used bridge plugging materials can be divided into four categories according to their shapes, namely granular materials, fibrous materials, sheet materials and other materials. [0003] Commonly used granular materials are walnut shells, rubber particles, etc. These granular materials play a role of "bridge" by blocking the "throat" of the leakage channel during the plugging process. Therefore, this granular material is also Known as "bridging agent". [0004] Commonly used fibrous materials are derived from plants, animals, minerals, and a range of synthetic fibers such as sawdust, asbestos, etc. This kind of fibrous material acts as a suspension in the plugging, criss-crossing and pulling each other in the for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
CPCC09K8/46C09K8/426C09K2208/18
Inventor 黄进军徐英黎然陈辛未李春霞
Owner SOUTHWEST PETROLEUM UNIV
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