Method for increasing formation bearing pressure during drilling plugging
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF0 Cites 10 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
compressive strength
aaaaa
aaaaa
hardness
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more