Anti-collapse drilling fluid and construction method thereof

A technology of drilling fluid and anti-slump agent, which is applied in chemical instruments and methods, earthwork drilling, flushing wellbore, etc. It can solve the problems of difficult processing, increased cost of drilling fluid, low anti-slump inhibition, etc., and achieves the reduction of chemical processing. volume effect

Active Publication Date: 2014-08-06
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

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  • Anti-collapse drilling fluid and construction method thereof
  • Anti-collapse drilling fluid and construction method thereof
  • Anti-collapse drilling fluid and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Aiming at the disadvantages of strong water sensitivity and easy hydration and dispersion of brownish-red and gray-green mudstone formations that are prone to well wall instability when exposed to water, the present invention provides an anti-collapse drilling fluid. The composition of the drilling fluid per cubic meter For: 1-3Kg potassium polyacrylate K-PAM, 1-3Kg inhibitor and anti-slump agent, 1-3Kg small cationic mud shale inhibitor, 10-30Kg potassium chloride, 1-2Kg large cationic inhibitor , and the balance is clear water.

[0026] In the present invention, the above-mentioned inhibition and anti-slump agent is the inhibition and anti-slump agent ZNP-1 for drilling fluid or the zwitterionic polymer FA367 for drilling fluid; the small cationic mud shale inhibitor is the small cationic mud 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 flui...

Embodiment 2

[0030] Evaluation of salt resistance ability 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 for 24 hours at room temperature, the apparent viscosity AV, plastic viscosity PV, and dynamic viscosity were measured by a six-speed rotational viscometer. Shearing force YP, static shearing force Ge (initial cut / finish cut) situation, then add 1.5% KCl in the base slurry 1, base slurry 2 and base slurry 3 of above-mentioned different formulations to obtain formula 1, formula 2 and formula 3, in Roll at 60°C for 16 hours, measure the apparent viscosity AV, plastic viscosity PV, dynamic shear force YP, and static shear force Ge (initial shear / finish shear) changes again, and the salt resistance properties of three different formulations are shown in Table 2 shown.

[0032] Table 2. Salt resistance evaluation of drilling fluid compound

[0033] ...

Embodiment 3

[0036] On the basis of Example 2, choose ZNP-1 and K-PAM, and add different treatment agents to drilling fluids with different formulations on the basis of them, and evaluate the inhibition of these different drilling fluids.

[0037] Take a certain amount of drilling cuttings from mudstone formations, including 50% each of brown-red and gray-green mudstone, and add four different formulations of drilling fluids as shown in Table 3 to the cuttings, and roll at 60°C for 16 hours. After rolling, the solution passes through a 18-mesh sieve, and is naturally rinsed with tap water. The washed cuttings are dried, weighed, and the mass percentage of the drilled cuttings after passing through the 18-mesh sieve and the original drilled cuttings is calculated as the primary recovery rate; after that, Add the recovered drill cuttings to the drilling fluid again, and roll for 16 hours at the same temperature of 60°C. After rolling, the solution passes through a 18-mesh sieve and rinses wit...

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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 fluid 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, which is dominated by brown-red and gray-green mudstone. Mainly gray green mudstone, brown red and gray green mudstone is characterized by strong water sensitivity, easy to hydrate and disperse when exposed to water, oilfield drilling encounters such formations are prone to wellbore instability, resulting in tripping out and tripping in When encountering obstacles, drill down a large section and ream, especially at the bottom of Anding Formation, Zhiluo Formation and Yanchang Formation at 200-300 meters. Take the Suli Gesu 36 block a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12E21B21/00
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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