A kind of anti-collapse drilling fluid and construction method thereof

A construction method and drilling fluid technology, which are applied in chemical instruments and methods, earth-moving drilling, wellbore flushing, etc., can solve problems such as handling difficulties, diameter reduction and blocking, tripping, drilling down, and electrical survey resistance, etc. To achieve the effect of reducing the amount of chemical addition

Active Publication Date: 2017-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] (1) When drilling with a large pool, if the drilling fluid content is increased, on the one hand, the overall performance of the entire well section will change, especially when drilling in the upper part of the Yanchang Formation, the diameter of the drill is prone to shrinkage and jamming. On the other hand, the cost of drilling fluid has also increased relatively;
[0005] (2) The function is single. Due to the single chemical species in the existing clear water polymer system drilling fluid, during the drilling process, the drilling fluid only acts as a coating flocculation for the cuttings, and the anti-slump inhibition is low;
[0006] (3) When using the existing clear water polymer system drilling fluid, when the well collapses, the well wall will easily form a pot belly and candied haws experience, and the dropped block is difficult to be taken out, resulting in tripping, tripping and electrical testing. relatively difficult

Method used

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  • A kind of anti-collapse drilling fluid and construction method thereof
  • A kind of anti-collapse drilling fluid and construction method thereof
  • A kind of anti-collapse drilling fluid and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Aiming at the shortcomings that the brown-red and gray-green mudstone formations, which have strong water sensitivity and are easily hydrated and dispersed after encountering water, are prone to instability of the borehole wall, the invention provides an anti-collapse drilling fluid. The composition of the drilling fluid per cubic meter It is: 1-3Kg potassium polyacrylate K-PAM, 1-3Kg inhibitor and anti-collapse agent, 1-3Kg small cationic shale inhibitor, 10-30Kg potassium chloride, 1-2Kg large cationic inhibitor , The balance is clean water.

[0026] In the present invention, the aforementioned anti-collapse inhibitor is ZNP-1 for drilling fluid or zwitterionic polymer FA367 for drilling fluid; the small cationic shale inhibitor is a small cationic shale inhibitor for drilling fluid CWD-1 or the small cation inhibitor CSW-1 for drilling fluid; the large cation inhibitor is the large cation inhibitor XL-007 for drilling fluid; among them, the above chemical reagents are a...

Embodiment 2

[0030] Evaluation of salt resistance of drilling fluid reagents:

[0031] In the test, base slurry 1, base slurry 2, and base slurry 3den with three different reagent formulations as shown in Table 2 were used. After aging at room temperature for 24 hours, the apparent viscosity AV and plastic viscosity PV were measured by a six-speed rotary viscometer. Shear force YP, static shear force Ge (initial cut / final cut), and then add 1.5% KCl to base slurry 1, base slurry 2 and base slurry 3 of the above different formulations to obtain formula 1, formula 2 and formula 3. Rolling at 60℃ for 16h, re-measure the changes of apparent viscosity AV, plastic viscosity PV, dynamic shear force YP, static shear force Ge (initial cut / final cut), and the salt resistance properties of three different formulations are shown in Table 2. Shown.

[0032] Table 2 Evaluation of salt resistance ability of drilling fluid compound

[0033] Drilling fluid formula AV (mPa) PV (mPa) YP (Pa) Ge (Pa / Pa) Base...

Embodiment 3

[0036] On the basis of Example 2, ZNP-1 and K-PAM were selected, and different treatment agents were added to drilling fluids of different formulations based on them, and the inhibitory properties of these different drilling fluids were evaluated.

[0037] Take a certain amount of drill cuttings from mudstone formations, 50% of which are brown-red and gray-green mudstone, respectively, add drilling fluids of four different formulations as shown in Table 3 to the drill cuttings, and roll for 16h at 60℃. After rolling, the solution is passed through an 18-mesh sieve and washed naturally with tap water. The washed drill cuttings are dried and weighed. The mass percentage of the drill cuttings after the 18-mesh sieve and the original drill cuttings is calculated as the primary recovery rate; Add the recovered drill cuttings to the drilling fluid again, and roll for 16 hours at 60℃. After rolling, the solution is passed through an 18-mesh sieve and washed with tap water. The washed dri...

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Abstract

The invention belongs to the technical field of drilling fluid in a petroleum and natural gas exploring and developing process, and particularly provides anti-collapse drilling fluid and a construction method thereof. Each cubic meter of the drilling fluid comprises 1-3 Kg of polyacrylic acid potassium, 1-3 Kg of restraint anti-collapse agent, 1-3 Kg of small positive ion shale restrainer, 10-30 Kg of potassium chloride, and 1-2 Kg of large positive ion restrainer and the balance is clear water. The drilling fluid is suitable for a stratum which is high in water sensitivity and has high probability in hydrating dispersion and borehole wall instability when the stratum is in water, and has a favorable anti-collapse effect.

Description

Technical field [0001] The invention belongs to the technical field of drilling fluids in the process of oil and natural gas exploration and development, and in particular relates to an anti-collapse drilling fluid and a construction method thereof. Background technique [0002] The geological structure of the Sulige block belongs to the Yishan slope of the Ordos Basin. The burial depth of the Anding to Zhiluo Formation is about 650-1050 meters, mainly brown-red and gray-green mudstone. The Yanchang Formation burial depth is about 1300-2100 meters. Mainly gray-green mudstone, brown-red and gray-green mudstone are characterized by strong water sensitivity, and are easily hydrated and dispersed when exposed to water. The wellbore wall is prone to instability when drilling in such formations, resulting in tripping and down drilling. When encountering obstacles, drilling down a large section of the eye, this phenomenon is especially obvious at the bottom of the Anding Formation, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00C09K8/12
CPCC09K8/12C09K2208/12E21B21/00
Inventor 陈华杨勇平石崇东王社利孙志强刘乃春贾彦强刘思远王凯侯博付红卫吴瑞鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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